KR101999713B1 - Mortar containing a polyurethane resin composition and a concrete structure using the same - Google Patents

Abstract

The present invention relates to a polyurethane composition mortar having strong wear resistance and a cross section repair and surface protection construction method of a concrete structure using the same and, more specifically, to a polyurethane composition mortar consisting of a base coating material, a middle coating material and a top coating material, and to a cross section repair and surface protection construction method of a concrete structure using the same. In addition, the present invention has an antibacterial water purification effect and an anion generating effect.

Description

Technical Field [0001] The present invention relates to a mortar and a concrete structure using the same, and more particularly to a mortar containing a polyurethane composition and a concrete structure using the same.

The present invention relates to a polyurea composition mortar and a method for repairing a cross-section of a concrete structure using the same, and more particularly, to a multi-use facility exposed to atmospheric moisture, ultraviolet rays, ozone, Corrosion and deterioration of concrete structures exposed to water, sewage treatment plant, sewage treatment plant, microorganism, sulfate ion, hydrogen sulfide, sulfuric acid and ozone water in contact with ozonated water due to artificial environment, This paper deals with the mortar of polyurea composition for maintenance and maintenance of deteriorated parts for maintenance of concrete structure and the maintenance method of surface protection and surface protection of concrete structure using it will be.

Concrete structures using cement such as bridges, multi-use facilities, water treatment plants, and culverts are constructed in various forms and widely used in industrial fields. They are used for adjusting durability and usability, compressive strength and tensile strength In addition, additional surface protective coatings are added to the surface of concrete structures depending on the application. New concrete structures are used to install surface protective coatings while constructing facilities or buildings. The surface is protected and restored after removing the deteriorated parts along the surface, and a surface protective film is provided on the surface.

Here, the above-mentioned concrete structure is exposed to the surface of the concrete structure due to wear, weakening, and corrosion according to the elapsed time and environmental requirements. In this state, corrosion and deterioration rapidly proceed into the concrete structure over time.

In this case, deterioration factors can be classified into natural environmental factors and artificial environmental factors. Concrete structures exposed to such environmental factors are vulnerable to durability and usability over time due to infiltration of various types of degraded phosphorus There is a disadvantage that deterioration proceeds rapidly.

 In addition, the surface protective coating of the concrete structure should be able to effectively prevent the deterioration factor from penetrating into the inside of the substrate.

Conventional concrete surface protection technology has added a separate ultraviolet screening process to the top coat to discolor and block the change of physical properties when exposed to ultraviolet and ozonated water.

That is, it is necessary to be able to actively cope with deterioration factors arising from the environmental requirements for maintaining durability and usability according to the durability of the concrete structure.

Degradation factors in natural environmental factors that deteriorate concrete structures include chlorine ion, sulfate ion, acid ion, ultraviolet ray in the atmosphere, and ozone which mediate shrinkage, expansion and moisture due to external temperature changes, Deterioration factors in the water treatment plant, ozone water mixed with ozone used for advanced treatment of sewage treatment plant, chlorine, sewage treatment plant and sewage structure are microorganisms, sulfate ion, hydrogen sulfide, sulfuric acid, etc., When the deterioration of the structure occurs, the deteriorated part should be removed, and the surface should be repaired and repaired, and the surface should be coated with a surface protective film.

In particular, deterioration factors in the use of sewage treatment plants and sewage structures and in anthropogenic environmental factors are as follows.

(I) Reduction of sulfate ion in sewage

와 같이 황화수소가 생성된다.Sewage inflow into the sewer pipe contains about 20 to 100 mg / L of sulfate ion, so that the sulfate ion is reduced by the action of the sulfate reducing bacteria in the anaerobic state,

Hydrogen sulfide is produced as shown in Fig.

(II) Diffusion of hydrogen sulfide in sewage

Although hydrogen sulfide is a highly soluble substance, it is easily gasified at pH 7 to 8 in sewage, so hydrogen sulfide produced in sewage easily diffuses into the sewer pipe.

(III) Oxidation of hydrogen sulfide

와 같이 황산으로 산화된다. Hydrogen sulfide diffused in the sewer pipe is dissolved in the condensation water on the concrete surface and oxidized by sulfur oxidizing bacteria under aerobic conditions,

And is oxidized to sulfuric acid.

By this process, a large amount of sulfuric acid is produced, and the pH becomes 1 to 2 or so.

(IV) Erosion of concrete by sulfuric acid

와 같이 시멘트 수화생성물의 구성 성분과 반응하여 콘크리트 구조물을 침식시킨다.Sulfuric acid produced from the surface of the concrete structure has the formula

And react with the constituents of the cement hydrate product to erode the concrete structure.

In this way, the erosion and performance degradation of concrete in the wastewater treatment plant occurs mainly under the reduction of sulfate under anaerobic conditions and oxidation of hydrogen sulfide at the same time on the wet concrete surface under aerobic conditions, The cement hardened body is decomposed due to the chemical reaction between the harmful ion penetrated into the concrete and the cement hydrate, resulting in problems such as deterioration, oxidation, cracking,

As a result, there is an increasing demand for maintenance and surface protection coating materials and construction maintenance.

On the other hand, cracks occur mainly in the early stage of construction due to combination of materials, construction, structure, load, environmental requirements, etc., and wear, weakening and corrosion occur on the surface of the concrete depending on elapsed time.

The penetration of such deterioration factors causes the performance and life of the concrete structure to become insufficient.

Conventional techniques widely used for repairing and reinforcing such concrete structures include epoxy resin mortar and polymer cement mortar.

Epoxy resin mortar is hard to cure at low temperature due to high temperature dependency at the time of curing and has a great effect on performance due to varying workability and working time depending on blend ratio of main material and curing agent. Due to its thermal expansion coefficient being 2 to 4 times larger than concrete, There is a disadvantage that the amount of deformation due to high temperature is large.

In addition, the polymer cement mortar has better integration with the structure than the epoxy resin mortar. However, since the thickener is added to improve the adhesion of the repair material, the surface and friction force inside the transportation hose are increased during the machine construction using the spray equipment, It is required to improve the workability because the discharge rate is decreased due to the decrease of the discharge amount, the workability of the trowel work is poor according to the type and amount of the polymer, and the thickness of the casting is relatively small.

Patent No. 10-0846159 (registered on July 8, 2008) Patent No. 10-0909997 (Registered on July 23, 2009) Patent Registration No. 10-1105490 (Registered on January 01, 2012)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to overcome the above-mentioned problems, and it is an object of the present invention to provide a method and a system for preventing the deterioration of the concrete structure such as neutralization, The polyurea composition is applied to the deteriorated part to prevent the alkali aggregate reaction from being unresponsive to the calcium chloride and is advantageous in preventing the corrosion of the road facilities and has no strong chemical reaction such as sulfuric acid and is suitable for the sewage treatment plant, It is advantageous for structures that behave like bridges by suppressing shock, vibration absorption and cracking due to the elasticity of elastic resin, moisture in accordance with the requirements of the natural environment, the multi-exposure to UV and ozone (O ₃₎ Polyurea composition mortar with high resistance to ultraviolet ray and weathering, and concrete structure using it for surface repair and surface protection when fully applied to flooring materials such as buildings, public parks, etc. The purpose of the method is to provide.

The polyurea composition mortar according to the present invention for achieving the above object is a polyurea composition mortar composed of a lower material, a middle material and a top material,

Wherein the primer is composed of 70 to 90% by weight of a urethane resin mixture mixed with 10 to 60: 90 to 40% by weight of a urethane acrylate resin and a polymethyl methacrylate resin, and 10 to 30% by weight of a latex resin,

Wherein the cementitious material comprises 40 to 60% by weight of sand, 10 to 25% by weight of calcium sulfoaluminate, 10 to 25% by weight of cement, 0.15 to 5% by weight of a fluidizing agent, 0.05 to 5% 0.5 to 10% by weight of a resin, and 2 to 10% by weight of an elastic resin,

Wherein the topsheet comprises a subject comprising an isocyanate group containing compound; A polyurea composition comprising a curing agent comprising an aromatic polyamine, wherein the polyurea composition has a viscosity of 20 mPa 占 퐏 at 20 占 폚 and comprising at least one ester of an aliphatic monocarboxylic acid having 12 to 24 carbon atoms and a monool having a carbon number of 1 to 10 Wherein the isocyanate group-containing compound is an isocyanate-terminated urethane prepolymer obtained by reacting a polyoxypropylene polyol with a toluene isocyanate or 4,4'-diphenylmethane diisocyanate, and the aromatic polyamine is an isocyanate group- (2-chloroaniline), bismethylthiotoluenediamine and diethyltoluenediamine, and the plasticizer is contained in an amount of 1 to 30% by weight, based on the total amount of the composition And a polyurea composition.

According to another aspect of the present invention, there is provided a method of repairing and protecting a surface of a concrete structure using a polyurea composition mortar (S 1) comprising chipping a deteriorated portion of a concrete structure; Removing the rust of the reinforcing bars of the deteriorated portion (S2); (S 3) washing the rust removal part of the reinforcing bar with high pressure water at a high pressure; Applying a primer to the surface of the deteriorated portion of the high-pressure concrete structure to form a primer layer (S 4); (S 5) filling and applying the background adjustment material on the undercoat layer to form the intermediate layer; And forming a top layer by applying a polyurea composition to the surface of the intermediate layer in a predetermined thickness and a predetermined shape (S6).

INDUSTRIAL APPLICABILITY As described above, the polyurea composition mortar according to the present invention and the method for repairing a cross section of a concrete structure using the same and the method for surface-protecting the same have the following effects.

First, the present invention has an effect of purifying water of antibacterial property and is an environmentally friendly material, living microorganism, and has an anion generating effect by non-toxic and harmless human body. Especially, cadmium (Cd), lead (Pb) , Mercury (Hg), hexavalent chromium (Cr6 +), and halogens such as bromine (Br) and chlorine (Cl).

Secondly, the present invention can control the hardening speed according to the maintenance position of the concrete structure, convenient combination of the polyurea composition mortar and construction, easy maintenance and re-work, It can be adapted to the requirements of the site.

Third, since the present invention is based on polyurea composition mortar, it is possible to control the curing time of 1 hour or 1 hour to 2 days after repairing the surface of the concrete structure and repairing the section, which is advantageous for urgent maintenance and reinforcement work in the urban area.

Third, the present invention is a polymer bonding structure having a molecular reactivity of at least 98%, which maintains a three-mesh network structure free from voids, has a strong abrasion resistance against external impact and abrasion, and is excellent in creep, shrinkage and crack prevention.

Fourth, the present invention is advantageous in preventing chloride attack on road facilities because there is no alkali aggregate reaction due to no reaction with calcium chloride, and there is no chemical reaction even with strong acid such as sulfuric acid, and is advantageous for sewage treatment plant, wastewater treatment plant, sewer pipe repair, It has a perfect watertightness that water can not permeate because there is no pore. It is advantageous for structures acting like bridges by suppressing impact, vibration absorption and cracking due to elasticity of elastic resin, It is strong against ultraviolet rays and has a strong abrasion due to weathering.

Fifth, the polyurea composition mortar according to the present invention is excellent in adhesion and adhesion to other concrete structures as well as the maintenance and reinforcement of the section of the concrete structure, so that there is no lifting or peeling phenomenon after the construction.

Sixth, the polyurea composition mortar according to the present invention has the advantage of being applicable to a concrete structure having a complicated shape by improving the speed of curing of a waterproofing material, hardening at room temperature and not requiring heating, and being able to be applied in a wide range by a spraying method .

Seventh, the polyurethane composition mortar according to the present invention can be applied to a concrete structure flooring material such as multi-use facilities exposed to moisture, ultraviolet rays and ozone (O ₃ ) according to natural environment requirements in the atmosphere, public parking lots, It is hardened and does not need to be heated, and it has a merit that it can be installed in a wide range by spraying method.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process diagram showing a construction process for repairing a section of a concrete structure using the polyurea composition mortar according to the present invention;
2 is a cross-sectional view showing a construction state of a concrete structure section repair using a polyurea composition mortar according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The polyurethane composition mortar according to the present invention is a polyurea composition mortar composed of an undercoat material, a middle material and a top material, wherein the undercoat material comprises a urethane acrylate resin and a polymethyl methacrylate resin in an amount of 10 to 60: 90 to 40 By weight of a mixture of 70 to 90% by weight of a urethane resin mixture and 10 to 30% by weight of a latex resin, wherein the intermediate material comprises 40 to 60% by weight of sand, 10 to 25% by weight of calcium sulfoaluminate % Of cement, 10 to 25 wt.% Of cement, 0.15 to 5 wt.% Of a fluidizing agent, 0.05 to 5 wt.% Of a curing retarder, 0.5 to 10 wt.% Of an acrylic resin and 2 to 10 wt. The topsheet material comprises a subject comprising an isocyanate group containing compound; A polyurea composition comprising a curing agent comprising an aromatic polyamine, wherein the polyurea composition has a viscosity of 20 mPa 占 퐏 at 20 占 폚 and comprising at least one ester of an aliphatic monocarboxylic acid having 12 to 24 carbon atoms and a monool having a carbon number of 1 to 10 Wherein the isocyanate group-containing compound is an isocyanate-terminated urethane prepolymer obtained by reacting a polyoxypropylene polyol with a toluene isocyanate or 4,4'-diphenylmethane diisocyanate, and the aromatic polyamine is an isocyanate group- (2-chloroaniline), bismethylthiotoluenediamine and diethyltoluenediamine, and the plasticizer is contained in an amount of 1 to 30% by weight, based on the total amount of the composition Polyurea composition.

Also, the polyurea composition mortar according to the present invention is a polyurea composition mortar composed of a base material, a middle material, and a top material, wherein the undercoating material comprises a urethane acrylate resin and a polymethyl methacrylate resin in an amount of 10 to 60: 40 to 60% by weight of the sand, 10 to 30% by weight of the calcium sulfoaluminate, 10 to 30% by weight of the latex resin, Of a curing agent, 0.1 to 5 wt% of a curing agent, 0.1 to 5 wt% of a curing agent, 0.05 to 5 wt% of a curing retarder, 0.5 to 10 wt% of an acrylic resin, and 2 to 10 wt% , The top surface material includes an ester type water-based urethane resin, a hydraulic powder, an aggregate and an admixture as essential components, and the ester type water-based urethane resin is an ester- Wherein the ester type water-based urethane resin has an average particle diameter of 20 占 퐉 or less and the ratio of the ester type water-based urethane resin (solid content) / hydraulic oil powder 1 to 20% by weight, and the ester type aqueous urethane resin (solid content) / cement ratio is 1 to 25% by weight.

Also, the undercoating material, the intermediate material, and the topcoat material are constituted at a weight ratio of 1: 1: 1.

That is, the polyurea composition mortar according to the present invention is improved by separately separating the undercoating material, the middle material and the top material, respectively, from the conventional concrete structure repair material composed of the undercoating material, the middle material and the top material.

The undercoating material is composed of a primer composed of 70 to 90% by weight of a urethane resin mixture mixed with 10 to 60: 90 to 40% by weight of a urethane acrylate resin and a polymethyl methacrylate resin, and 10 to 30% by weight of a latex resin do.

That is, the undercoating material is composed of 70 to 90% by weight of the urethane resin mixture and 10 to 30% by weight of the latex resin.

Here, the urethane resin mixture is prepared by mixing urethane acrylate resin and polymethyl methacrylate resin in a weight ratio of 10 to 60:90 to 40, and if necessary, calcium carbonate, talc, or both are mixed with a filler.

The urethane acrylate resin can impart durability to a primer as a primer, and the urethane acrylate resin is a hybrid resin having both urethane and acrylate characteristics.

These urethane acrylate resins are generally prepared by polymerization of a urethane prepolymer with a hydroxyalkyl acrylate.

The urethane prepolymer is formed by a polymerization reaction of a polyol and isocyanate, and the types thereof are various.

Examples of the hydroxyalkyl acrylate include methyl methacrylate, 2-hydroxyethylmethacrylate, n-butyl acrylate, and the like.

It is preferable that the urethane resin mixture in which the urethane acrylate resin and the polymethyl methacrylate resin are mixed is composed of 20% by weight based on 100% by weight of the primer.

If the content of the urethane resin mixture is less than 70% by weight, the latex resin may not be properly mixed with the latex resin. If the content of the urethane resin mixture exceeds 90% by weight, bleeding may occur after curing.

If necessary, hydroxyethyl methacrylate resin may be further added to the urethane resin mixture to reinforce the strength of the concrete structure.

On the other hand, the latex resin has a specific gravity of 0.98 and contains 60% of water, 35% of rubber, 2% of protein, 1% of soap, fatty acid and sterol, 1% of sugar, 0.4% of inorganic substance and enzyme.

Particles of natural rubber wrapped in a protein layer float in water, and the particle diameter is usually 0.5 to 1μ.

Particularly, the latex resin has a brittle and sintering function at a low temperature and a high temperature, and does not break even in a dynamic structure, and is a resin that complements the water separation phenomenon and durability like a conventional epoxy.

The weight of the intermediate material is 40 to 60% by weight of sand, 10 to 25% by weight of calcium sulfoaluminate, 10 to 25% by weight of cement, 0.15 to 5% by weight of a fluidizing agent, 0.05 to 5% 0.5 to 10% by weight of an acrylic resin, and 2 to 10% by weight of an elastic resin.

That is, the background adjusting material is composed of sand, calcium sulfoaluminate, cement, fluidizing agent, curing retarder, acrylic resin, and elastic resin.

Here, the sand plays a role of a filler in the background adjusting material, and there is no limitation on the grain size, but a mixture of No. 5 and No. 7 sand is used.

The content of the sand is preferably in the range of 40 to 60% by weight, and when it is less than 40% by weight, the effect of suppressing the shrinkage of the curing agent is small and the amount of drying shrinkage can be increased. If it is used in excess, the amount of the filler is excessive, and the fluidity and the workability may be lowered.

The calcium sulfoaluminate (CSA) is used in an amount of 10 to 25% by weight as an Al 2 O 3 component.

If the calcium sulfoaluminate (CSA) content exceeds 25% by weight, it is difficult to secure the working time due to rapid condensation, and when less than 10% by weight is used, the strength is lowered due to the overexpansion reaction.

The above-mentioned cement is made of Portland cement, which is obtained by pulverizing a mixture of calcareous raw material and clayy raw material in an appropriate ratio, finely pulverizing and calcining the resulting clinker at about 1,450 ° C as a coagulation controlling agent by adding gypsum to the obtained clinker. It reacts with hydrated lime and anhydrous gypsum and forms a pozzolan and ettringite reaction to stabilize and stabilize the concrete structure.

The hydrate formed in this way exhibits high strength properties, and it is preferable to use one kind of ordinary portland cement having a powder particle size of about 3,500 to 4,200 cm < 2 > / g, preferably 10 to 25% by weight.

The fluidizing agent is used to increase the fluidity of the background adjusting material. For example, the fluidizing agent may be at least one selected from the group consisting of naphthalene sulfonate, melamine sulfonate and polycarboxylic acid. The fluidizing agent may be used in the range of 0.15 to 5 wt% do.

The curing retarder is for preventing rapid curing of the mixture of the base adjusting material and includes sodium citrate, citric acid, potassium tartrate, sodium tartrate, and the like.

Particularly, it is preferable to use 0.05 to 5% by weight of the above-mentioned sodium citrate.

The acrylic resin is used for improving the strength and durability of the background adjusting material.

The acrylic resin is used in an amount of 0.5 to 10 wt%.

If the content of the acrylic resin is less than 0.5% by weight, the effect of improving the strength and durability may be deteriorated. If the content of the acrylic resin exceeds 10% by weight, the effect of improving the strength and durability is excellent but not economical.

The elastic resin is added to improve the chemical resistance and antimicrobial properties of the background adjusting material, and it is preferable that the elastic adjusting resin contains 2 to 10 wt% of the base adjusting material.

 On the other hand, 5 parts by weight of a solidifying agent was added and mixed with 100 parts by weight of the ground adjusting agent.

The solidifying agent is composed of 75 wt% of polysilicon sludge, 20 wt% of basic inorganic substance and 5 wt% of silica fume.

The basic inorganic material is composed of 57.34% by weight of CaO, 2.52% by weight of SiO2, 1.44% by weight of Al2O3, 0.67% by weight of FeO3, 0.22% by weight of SO3, 37.34% by weight of MgO, 0.29% by weight of K2O and 0.18% by weight of F.

The basic inorganic material is composed of 94.68% by weight of CaO, 2.52% by weight of SiO2, 1.44% by weight of Al2O3, 0.67% by weight of FeO3, 0.22% by weight of SO3, 0.29% by weight of K2O and 0.18% by weight of F.

The basic inorganic material is composed of 2.52% by weight of SiO2, 1.44% by weight of Al2O3, 0.67% by weight of FeO3, 0.22% by weight of SO3, 94.68% by weight of MgO, 299% by weight of K2O and 0.18% by weight of F.

The basic mineral is composed of light dolomite.

That is, the solidifying agent according to the present invention is a mixture prepared by mixing polysilicon sludge, basic inorganic substance and silica fume in a predetermined ratio.

On the other hand, the topsheet may include a subject containing an isocyanate group-containing compound; A polyurea composition comprising a curing agent comprising an aromatic polyamine, wherein the polyurea composition has a viscosity of 20 mPa 占 퐏 at 20 占 폚 and comprising at least one ester of an aliphatic monocarboxylic acid having 12 to 24 carbon atoms and a monool having a carbon number of 1 to 10 Wherein the isocyanate group-containing compound is an isocyanate-terminated urethane prepolymer obtained by reacting a polyoxypropylene polyol with a toluene isocyanate or 4,4'-diphenylmethane diisocyanate, and the aromatic polyamine is an isocyanate group- 1-methylene bis (2-chloroaniline), bismethylthiotoluenediamine, and diethyltoluene diamine, and the plasticizer is contained in an amount of 1 to 30% by weight based on the total amount of the composition .

That is, the polyurea composition is a polyurea coating composition comprising a subject containing an isocyanate group-containing compound and a curing agent comprising an aromatic polyamine, wherein the polyurea coating composition is an ester of an aliphatic monocarboxylic acid having 12 to 24 carbon atoms and a monool having 1 to 10 carbon atoms And a viscosity of 15 mPa 占 퐏 or less at 15 占 폚.

The above-mentioned polyurea composition can provide a polyurea composition excellent in workability at a sufficiently low point without curing a solvent, hardened at room temperature, hardened, cured, and excellent in appearance of the coating film, mechanical strength and top coat.

Also, the polyurea composition is an isocyanate-terminated urethane prepolymer obtained by reacting a polyoxypropylene polyol with a toluene isocyanate or 4,4-diphenylmethane diisocyanate, and the isocyanate group-containing compound is a isocyanate group-terminated urethane prepolymer.

The above-mentioned polyurea composition can provide a polyurea composition having less problem of safety because of low odor of the subject and having sufficient curability.

Also, in the above-mentioned polyurea composition, the aromatic polyamine is a mixture of at least one selected from the group consisting of 4, 4 methylene bis (2-chloroaniline), bismethylthiotoluene diamine, and diethyltoluene diamine.

The polyurea composition described above can provide a polyurea composition which satisfactorily satisfies the curing at room temperature and is excellent in the mechanical strength and growth performance of the obtained cured product.

Further, the polyurea composition includes 1 to 30% by weight of a plasticizer based on the total amount of the composition.

The polyurea composition can provide a polyurea composition having a sufficiently low workability at a sufficiently low temperature without using a solvent and having excellent adhesion to a topcoat.

In addition, the polyurea composition is a hand-type or quick-curing spray type waterproofing material or flooring material.

The above-described polyurea composition can provide a hand-made type or a quick-curing spray type composition having good workability.

In the above-mentioned polyurea composition, it is preferable that the polyurea composition is composed of 15 or more kinds of aliphatic monocarboxylic acids having 12 to 24 carbon atoms and esters of monools having 1 to 10 carbon atoms (hereinafter referred to as aliphatic monocarboxylic acid alkyl ester) Lt; 0 > C and a viscosity of 15 mPa · s or less is used.

The plasticizer comprising one or more of the above-mentioned aliphatic monocarboxylic acid alkyl esters preferably has a viscosity of 1 to 15 mPa · s at 15 ° C, and particularly preferably 3 to 10 mPa · s.

By using one or more of the above-mentioned aliphatic monocarboxylic acid alkyl esters as a plasticizer, the viscosity of the mixture of the subject and the curing agent can be greatly lowered without using a solvent.

As the plasticizer of the above polyurea composition, an aliphatic monocarboxylic acid having 12 to 24 carbon atoms and a diol and a diester having 2 to 10 carbon atoms may be used in addition to the aliphatic monocarboxylic acid alkyl ester.

Examples of the aliphatic monocarboxylic acid having 12 to 24 carbon atoms include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, babucene, linoleic acid, linolenic acid, eicosanoic acid, docosanoic acid, .

The monool having 1 to 10 carbon atoms is particularly preferably a monool having 1 to 5 carbon atoms, and most preferably methanol.

Further, monocarboxylic acid alkyl ester compounds obtained by modifying vegetable oils and animal fats are also exemplified.

In the polyurea composition described above, the monocarboxylic acid methyl ester mixture, which is a methanol ester of fatty acids such as soybean oil fatty acid, ferric fatty acid, and rapeseed fatty acid, has a low viscosity (viscosity at 5 DEG C of 5 to 8 mPa.s) and low volatility desirable.

On the other hand, general purpose plasticizers such as dioctyl phthalate dibutyl phthalate zononylphthalate nonyl, adipate dioctyl, chlorinated paraffin, and petroleum plasticizers can be used in small quantities, but since they can not obtain a sufficient viscosity reduction effect, they are not used .

If used together, the amount thereof is preferably 50% by weight or less, more preferably 30% by weight or less based on the total amount of the plasticizer including the aliphatic monocarboxylic acid alkyl ester.

In the above polyurea composition, it is preferable to use an aliphatic monocarboxylic acid alkyl ester as a plasticizer in an amount of 2 to 15% by weight based on the total amount of the composition.

If the amount of the plasticizer used is less than 2% by weight, a sufficient viscosity reduction effect can not be obtained, and the cured coating film having a content of more than 15% by weight tends to bleed, and the adhesiveness of the topcoat is lowered.

The plasticizer can be added to the resin and / or the curing agent, but it is preferable to add the plasticizer to the curing agent in the hand-drawn type composition.

The filler can be mixed more uniformly and efficiently by adding the plasticizer on the curing agent, so that the surface of the cured coating film becomes conspicuous.

The addition amount thereof is preferably 30% by weight or less, more preferably 5 to 25% by weight in the curing agent.

On the other hand, it is preferable to add a plasticizer to the resin because the viscosity of the composition of the quick-cure spray type is particularly high.

Since the viscosity is lowered by using the above-mentioned plasticizer, it is necessary to warm the resin and the curing agent to 50 to 70 占 폚 during the conventional injection molding, but it can be sufficiently applied by heating at about 40 to 60 占 폚.

The addition amount thereof is preferably 30% by weight or less, more preferably 5 to 25% by weight of the resin.

On the other hand, examples of the isocyanate group-containing compound contained in the subject in the polyurea composition include a polyisocyanate and an isocyanate-terminated urethane prepolymer obtained by reacting a polyol and a polyisocyanate.

These may be used alone or in a mixture of both.

Examples of the polyisocyanate include an aromatic polyisocyanate having two or more isocyanate groups, an aliphatic polyisocyanate or a modified polyisocyanate.

The above polyurea composition is preferably an aromatic polyisocyanate or a modified product thereof, and more specifically, 4,4-diphenylmethane diisocyanate (hereinafter referred to as MDI), polyphenylpolymethylene polyisocyanate (hereinafter referred to as CMI MDI) , Carbodiimide-modified diphenylmethane diisocyanate (hereinafter referred to as carbodiimide-modified MDI), and the like.

These may be used alone or in a mixture of both.

Examples of the polyol to be used as a starting material for the isocyanate-terminated prepolymer include polyester polyol, polyether polyol such as polyoxypropylene polyol, polyoxypropylene oxyethylene polyol, and polyoxytetramethylene glycol, castor oil-based polyol, polybutadiene- .

Here, the castor-based polyol refers to a modified polyol obtained by introducing a hydroxyl group into castor oil or castor oil.

In the polyurea composition described above, a polyether polyol is preferable, and a polyoxypropylene polyol is more preferable.

Mixtures of polyoxypropylene diol and polyoxypropylene triol are also preferably used.

In this case, the molar ratio is preferably 60 to 90/40 to 10.

The hydroxyl number of the polyol is preferably 2 to 4, more preferably 3 or less, particularly preferably 25 or less, and even more preferably 21 to 24 on average.

When the number of hydroxyl groups is less than 2, it is difficult to increase the molecular weight of the cured coating film, so that the mechanical strength of the cured product becomes insufficient. When the number of hydroxyl groups exceeds 4, the crosslinking density becomes too high.

The hydroxyl value of the polyol is preferably 15 to 80 mg KOH / g, more preferably 40 to 70 mg KOH / g when used in a hand-drawn type composition.

On the other hand, when used in the composition of the quick-cure spray type, 25 to 280 mg KOH / g is preferable, and 30 to 115 mg KOH / g is particularly preferable.

If the hydroxyl value and the hydroxyl value are out of the above range, the resulting cured coating film is insufficient in mechanical strength or in the elasticity and growth of the cured coating film.

The molecular weight of the polyol is preferably from 150 to 7,000, more preferably from 700 to 1,500, in terms of the viscosity of the obtained prepolymer, the strength of the cured coating film, and the elongation performance.

Examples of the polyisocyanate as a raw material of the isocyanate group-terminated urethane prepolymer include the polyisocyanate and the like.

When the polyurea composition is used in a hand-drawn type composition, it is preferable to use isoprene isocyanate in view of the viscosity, curability and mechanical strength of the cured coating film of the obtained prepolymer. In particular, the content of 2,4- % Or more.

On the other hand, when used in compositions of the fast cure spray type, MDI is preferred in terms of curability.

The isocyanate group content of the isocyanate group-terminated urethane prepolymer is preferably from 2 to 5% by weight for hand-painted type waterproofing materials, from 4 to 8% by weight for flooring materials, and from 8 to 15% by weight for room materials.

It is preferable that 10 to 15 wt% of the waterproof material of the quick-cure spray type, 15 to 25 wt% of the bottom material, and 15 to 30 wt% of the spray material are used.

The aromatic polyamines contained in the curing agent of the polyurea composition include 4,4-methylenebis (2-chloroaniline), bismethylthiotoluenediamine, diethyltoluenediamine, 4,4-methylenebis (3-chloro- , 6-diethylaniline), and the like.

In the above-mentioned polyurea composition, one or a mixture of two or more selected from the group consisting of 4,4-methylene bis (2-chloroaniline), bismethylthiotoluenediamine, and diethyltoluene diamine is preferable.

In addition, when the aromatic polyamine is used together with a polyol having a relatively high molecular weight, an appropriate curing property can be obtained.

The number of hydroxyl groups in the polyol used as the curing agent is preferably 2 to 4, more preferably 2 to 3.

The hydroxyl value is preferably 10 to 112 mgKOH / g, more preferably 16 to 56 mgKOH / g.

 The polyol is preferably a polyoxypropylene polyol.

If the number of hydroxyl groups is less than 2, it is difficult to increase the molecular weight of the cured coating film, so that the curing property deteriorates and the mechanical strength of the cured product becomes insufficient and the crosslinking density exceeding 4 hydroxyl groups is too high.

If the hydroxyl value is less than 10 mgKOH / g, the viscosity of the polyol becomes high. If the hydroxyl value is more than 112 mgKOH / g, the amount of the curing agent is decreased because the molecular weight is small. Which is not preferable.

This polyol is preferably obtainable by reacting propylene oxide with 2 to 4 hydroxyl groups, and more preferably 2 to 3 hydroxyl groups.

Further, the curing agent includes a curing catalyst for satisfying sufficient curability.

As the curing catalyst, a known catalyst for promoting the urea urethanization reaction can be used, and examples thereof include organic lead and organic tertiary amine compounds.

In addition to the above basic components, the curing agent may further include additives selected from fillers, pigments, and stabilizers.

Examples of the filler include calcium carbonate, talc, clay, silica, and carbon.

Examples of the pigment include inorganic pigments such as chromium oxide and titanium oxide, and organic pigments such as phthalocyanine pigment.

Examples of the stabilizer include an antioxidant, an ultraviolet absorber, and a dehydrating agent which are generally used in a polyurea / polyurethane resin.

It does not mean that the polyurea composition includes a solvent which is preliminarily contained in an additive substantially containing no solvent, etc., but does not include a solvent added for the purpose of viscosity reduction.

Specifically, the content of the solvent in the base and the curing agent is 3% by weight or less, more preferably 1% by weight or less.

The molar ratio {NCO / (NH2 + OH)} of the isocyanate group in the resin to the active hydrogen-containing group in the curing agent in the polyurea composition is preferably 10 to 13.

If the molar ratio is less than 10, sufficient mechanical strength of the cured coating film may not be obtained or a tack may remain on the surface of the coating film.

When the molar ratio is 13 or more, excess isocyanate groups are liable to bloom by the influence of moisture, or a cured coating film brittleness tendency is seen.

Examples of the polyurea composition according to the present invention include an ester type water-based urethane resin, a hydraulic powder, an aggregate and an admixture as essential components, wherein the ester type water-based urethane resin is an ester type or polyester- Wherein the ester-type water-based urethane resin has an average particle diameter of 20 占 퐉 or less and the ester-type water-based urethane resin (solid content) / water-soluble powder ratio is 1 - 20% by weight, and the ester type water-based urethane resin (solid content) / cement ratio is 1 to 25% by weight.

The ester-type water-based urethane resin is a water-soluble resin or an aqueous emulsion mainly composed of an ester-based or polyester-based water-based urethane resin component, and is of a self-emulsifying type or a forced emulsifying type.

In addition, these are fine particles having an average particle diameter of 20 μm or less and good bonding with water, and increased viscosity, fluidity, pharyngeal fragmentation, bridging and so forth due to the properties of the polyurea composition when mixing powder and dough including a high-performance reducing agent and a high- Resistance to material separation, etc., that is, workability is improved.

As a result, improvement of adhesion strength with finished concrete structure, decrease of shrinkage of drying, difficulty of occurrence of cracks, improvement of bending strength, elasticity and inhibition of permeation of corrosive factors in the external environment are remarkably improved.

In particular, the ester-type water-based urethane resin is a water-soluble resin or an aqueous emulsion mainly composed of an ester-based or polyester-based water-based urethane resin component, and is a self-emulsifying type or a forced emulsifying type.

The water-soluble resin or water-based emulsion mainly comprising the ester-based or polyester-based water-based urethane resin component includes an ester-based ester-based resin.

Here, the water-based urethane resin is a state in which polyurethane or its prepolymer is dispersed in water.

The water-based urethane resin can be classified into three kinds of colloidal dispersion of 0001 占 퐉 according to the particle size, colloidal dispersion of aqueous solution of 1000 占 퐉 to 01 占 퐉, and emulsion when it is more than 01 占 퐉, but it is preferable that the average particle diameter is not more than 20 占 퐉.

The water-soluble resin or water-based emulsion mainly comprising the ester-based or polyester-based water-based urethane resin component is an aliphatic amorphous transition) and an aromatic isocyanate-based (sulfur-modified).

The water-soluble resin or the water-based emulsion mainly containing the ester-based or polyester-based water-based urethane resin component is anionic, cationic, nonionic weak anionic and nonionic / weak anionic.

The ester type water-based urethane resin is a water-soluble resin or an aqueous emulsion mainly composed of an ester type or polyester type aqueous urethane resin component, and has a glass transition temperature (Tg) of -60 캜 to 50 캜.

The ester-type water-based urethane resin (solid content) / hydraulic powder ratio is preferably 1% by weight to 20% by weight.

In the above-mentioned polyurea composition, the ratio of ester type water-based urethane resin (solid content) / cement is in the range of 1 to 25% by weight.

In the above-mentioned polyurea composition, the hydraulic powder hardens or coagulates when mixing with water.

In the polyurea composition described above, the aggregate may be an inorganic aggregate or an organic aggregate.

Further, as the admixture material in the polyurea composition, it is distinguished as an admixture and an admixture.

The admixture is a total guide system of siliceous fine powder, limestone fine powder and anti-seizure agent, lime-based coloring agent, and aged steel admixture.

In addition, the admixture can be added to a wide variety of materials such as AE agent, water reducing agent, AE water reducing agent, high performance water reducing agent, high performance AE water reducing agent and fluidizing agent to improve workability, retarder, retarder, The other foam controlling agents that control the agent include moisturizing agents (thickening agents), drying shrinkage reducing agents, defoaming agents, and the like.

In the rubber latex system, there are styrene butadiene rubber, chloroprene rubber, methyl methacrylate butadiene rubber, acrylonitrile butadiene rubber, and resin emulsion type in the natural rubber latex and the synthetic rubber latex type are poly There are mixed latexes and mixed emulsions of acrylic acid ester, ethylene vinyl acetate, styrene acrylic acid ester, vinyl propionate, polypropylene, polyvinyl acetate, epoxy resin asphalt, rubber asphalt and paraffin mixed dyes.

Examples of the emulsion type powder resin (including the powder emulsion) include ethylene vinyl acetate, vinyl acetate vinyl bazate, styrene acrylic acid ester, and polyacrylic acid ester.

The water-soluble polymer (including monomers) includes cellulose derivatives, polyvinyl alcohol, and acrylates.

The liquid polymer may be used in combination with an unsaturated polyester resin, an epoxy resin, or the like.

On the other hand, it is noted that the titanium dioxide composition may be applied to the surface of the above-mentioned material as necessary.

Here, the titanium dioxide composition comprises 50% titanium dioxide (TiO2) sol prepared by mixing Ti [OCH (Cl3) 2] 4, (CH3) 2 CHOH in a weight ratio of 1: 1; 40% silica sol prepared by mixing C8H20O4Si, (CH3) CHOH in a weight ratio of 1: 1; 9% zinc oxide sol made of Zn (C2H3O2) 2; And 1% of metal ions.

That is, the titanium dioxide composition has a function of decomposing / removing the contaminants attached to the concrete structure and the NOx, SOx, and odorous gas by the photochemical reaction and sterilizing the microorganisms.

Here, the titanium dioxide composition forms titanium dioxide (TiO2) ultrafine particles having excellent photocatalytic activity as a photocatalytic activity, and at least one metal ion among Ag, Zn, and Cu is carried thereon so that it is excited in the valence band by irradiation of ultraviolet rays, By suppressing the recombination of excited electrons in the holes of the valence band within a short time, the photochemical reaction is sufficient at a small amount of ultraviolet energy by keeping the active point of the photochemical reaction at the maximum, A deodorizing effect, a protective effect, and a sterilizing effect can be further exerted by the microbial sterilization mechanism.

On the other hand, 5 to 10 parts by weight of a ceramic composition is added to 100 parts by weight of the polyurea composition mortar, and the ceramic composition comprises 4 to 20% by weight of magnesium oxide, which is either magnesium or molybdenum magnesium; 5 to 20% by weight of a phosphate comprising at least one of ammonium phosphate (NH4H2PO4), potassium phosphate (KH2PO4) and sodium phosphate (NaH2PO4); 10 to 20% by weight of a silicate consisting of at least one of meta kaolin, silica fume, blast furnace slag and fly ash; 50 to 83.5% by weight of a retarder composed of at least one of stearic acid, borax, boric acid and sodium gluconate, 5 to 20% by weight of a fluidizing agent, 1 to 10% by weight of a water repellent agent, polyvinyl alcohol fiber (PVA) 1 to 10% by weight of an additive comprising 0.5 to 2% by weight of a fiber composed of one of nylon fibers (NY) and polyethylene fibers (PE) and 10 to 20% by weight of lime; 30 to 80% by weight of fine aggregate composed of natural sand, artificial silica sand, and hollow lightweight aggregate.

Here, the ceramic composition is composed of magnesium oxide, phosphate, silicate, additives, and fine aggregate.

The magnesium oxide is prepared by pyrolysis of magnesium carbonate (MgCO3) which is composed of 4 to 20% by weight and is mainly produced as natural magnesite.

The magnesium oxide may be either deadburned MgO produced through calcination at 1400 DEG C or higher, or molten magnesium produced through electrical calcination at 2300 DEG C or higher.

The purity of the magnesium oxide is not particularly limited, but it is preferable to use at least 75%.

There is no particular limitation on the particle size, but it is preferable to use particles having a particle size of 10 탆 or less of 30% by weight or less of the total weight, or particles having an amount of 150 탆 or more exceeding 5% by weight of the total weight.

Further, when magnesium oxide is added in an amount of less than 4% by weight in the top layer material, bleeding occurs on the surface due to the lack of reaction products and the strength is lowered. When the amount exceeds 20% by weight, the flow is significantly reduced, The time can not be secured and the addition rate of the retarding agent becomes very high.

Therefore, magnesium oxide is preferably used in a range of 4 to 20% by weight.

Further, the phosphate is mixed in the range of 5 to 20 wt%.

If the phosphate is used in an amount of less than 5% by weight, the flow loss becomes very large, the workability is poor and the reactivity is poor, which hinders the strength development. On the other hand, when the phosphate is used in an amount exceeding 20% by weight, , It is difficult to secure a sufficient pot life.

In the present invention, the phosphate may be used in the form of a mixture of ammonium phosphate and calcium phosphate, a mixture of ammonium phosphate and sodium phosphate, and a mixture of potassium phosphate and sodium phosphate for hybridization for performance improvement.

In this case, the mixing form of ammonium phosphate and calcium phosphate is 5 to 50% by weight of ammonium phosphate and 50 to 95% by weight of potassium phosphate, and the mixing form of ammonium phosphate and sodium phosphate is 5 to 50% by weight of ammonium phosphate, 95% by weight, and 5 to 95% by weight of ammonium phosphate and 5 to 95% by weight of potassium phosphate.

The purity of the ammonium phosphate should be at least 90%, and the pH is most preferably in the range of 3 to 5.

This ammonium phosphate reacts with magnesium oxide to produce magnesium hexachloride, which is a flaky crystal, and magnesium hexachlorohydride forms a three-dimensionally cured body. In this case, internal self-heating occurs and the strength can be developed even at low temperatures And realizes excellent wear resistance and high strength.

The purity of the potassium phosphate should be 90% or more, and the pH is most preferably in the range of 3 to 5.

The potassium phosphate reacts with magnesium oxide to produce potassium chloride magnesium hexachloride, which is a spherical crystal. The magnesium chloride hexahydrate of the potassium phosphate forms a three-dimensionally cured body, exhibits excellent impact resistance and adhesion performance, It has excellent characteristics of nonflammability.

In addition, the purity of the sodium phosphate should be 90% or more, and the pH is most preferably in the range of 4 to 5.

 The sodium phosphate reacts with magnesium oxide to form sodium chloride, magnesium chloride, and magnesium chloride, which are spherical crystals. The magnesium chloride hexahydrate forms three-dimensionally hardened bodies to exhibit excellent water resistance and abrasion resistance, There is an excellent characteristic of control performance.

On the other hand, the silicate is used by 10 to 20% by weight to improve the physical properties of the magnesia silicate phosphate-based composite by forming an alumina silicate structure (geopolymer) by eluting Si and Al components by phosphate.

If the silicate is used in an amount of less than 10% by weight, it is not effective for improving the long-term strength and the workability is very low.

On the other hand, when it is used in an amount exceeding 20% by weight, the early strength development is deteriorated.

Since such silicates are used for filler performance and secondary pozzolanic reaction, it is preferable to use at least one of meta kaolin, silica fume, blast furnace slag, and fly ash in the present invention.

At this time, metha-kaolin and silica fume occupy most of the silicate content, which is advantageous for high strength and improved durability. Blast furnace slag and fly ash induce long-term strength enhancement by pozzolanic reaction and workability can be improved.

1 to 30% by weight of silica fume and 70 to 99% by weight of one of meta kaolin, blast furnace slag and fly ash are mixed to produce a silicate.

Next, the additive is composed of a retarder, a fluidizing agent, a water repellent agent, a fiber, and a lime, and 1 to 10% by weight is used.

The retarder is used because it is necessary to secure a sufficient pot life by the ultra-rapid hardening. As the magnesia salt is received in the acidic atmosphere due to the acidic atmosphere composition, the unreacted magnesia is remained, .

At least one selected from the group consisting of tartaric acid, borax, boric acid and sodium gluconate is used as the retarder, and the retarder is used in the range of 50 to 83.5% by weight.

When the retarder is used in an amount of less than 50% by weight, the effect of retarding the coagulation is extremely low and it is difficult to secure the pot life. When the retarder is more than 83.5% by weight, the early strength development is delayed and the long term strength becomes poor.

The fluidizing agent serves to improve the fluidity of the inner particles of the acid phosphatite complex by chemical electrodeposition.

That is, in the present invention, an acidic system, that is, a gypsum-based fluidizing agent is used because it requires reactivity in acidity.

At this time, the fluidizing agent is used in a range of 5 to 20 wt%, and when it is used in an amount of less than 5 wt%, it is difficult to secure a predetermined flowability, and when it exceeds 20 wt%, the early strength development is delayed, It is not economical.

The water repellent agent plays a role of improving the water resistance and waterproof performance by forming a coating film on the inner particle surface and the hardened body surface while dissolving in water

The water repellent agent is added additionally in order to maximize the water resistance, and mainly used in the range of 1 to 10% by weight.

When the water repellent agent is used in an amount of less than 1 wt%, the effect of improving the water resistance is not exhibited. On the other hand, when the water repellent agent is used in an amount exceeding 10 wt%, the beam becomes very poor and the manufacturing cost is greatly increased.

The fiber plays the role of suppressing cracking and reducing the strain by crosslinking the internal matrix with the fibers.

The fiber is a material to be added additionally in order to maximize the shrinkage control and crack control performance in the present invention. One of polyvinyl alcohol fiber (PVA), polypropylene fiber (PP), nylon fiber (NY), and polyethylene fiber And the length and the diameter are in the range of 3 to 12 mm and 10 to 40 μm, respectively.

If the content of the fiber is less than 0.5% by weight, the toughness of the cured product may deteriorate and crack control may be difficult. When the content of the fiber exceeds 2% by weight, ball, the endurance performance is deteriorated and the strength is significantly lowered.

The lime is composed of calcium hydroxide or calcium oxide, which converts the acidic atmosphere in the magnesia silicate phosphate-based ceramics composition into an alkaline atmosphere, thereby enhancing the activity of the pozzolanic reaction as a secondary reaction of the above-mentioned silicate and promoting the formation of CSH gel Excellent function for improvement.

Therefore, the slaked lime or quicklime is added in order to improve the reactivity of the silicate by increasing the activity of the pozzolanic reaction by converting the slightly acidic to weakly alkaline in the present invention.

Such slaked lime or quicklime is added in a range of 10 to 20% by weight.

Next, fine aggregate means natural sand, artificial silica sand, and hollow lightweight aggregate, and 30 to 80% by weight is used.

If the fine aggregate is used in an amount of less than 30% by weight, the production cost increases. If the fine aggregate exceeds 80% by weight, the fluidity is very low, and the work performance is significantly lowered and the strength is lowered.

These fine aggregates are materials added to reduce the manufacturing cost, and have a surface dry density of 25 g / cm 2 or more and a water absorption rate of 30% or less as specified in KS F 2526.

On the other hand, 5 to 10 parts by weight of a polyurea composition is added to 100 parts by weight of the polyurea composition mortar, and the polyurea composition is an ester of an aliphatic monocarboxylic acid having 12 to 24 carbon atoms and a monool having 1 to 10 carbon atoms Containing compound having a viscosity of 20 mPas or less at 20 캜 and composed of one or more isocyanate group-containing compounds obtained by reacting polyoxypropylene polyol with 4,4'-diphenylmethane diisocyanate or 4,4'-diphenylmethane diisocyanate Terminated urethane prepolymer, wherein the aromatic polyamine is a mixture of at least one member selected from the group consisting of 4,4'-methylene bis (2-chloroaniline), bismethylthiotoluene diamine, and diethyltoluene diamine, By weight based on 100% by weight of the composition including 1 to 30% by weight based on the total amount of the composition, Based water-based urethane resin, a water-based powder, an aggregate and an admixture are essential components and the ester-type water-based urethane resin is a water-soluble resin or an aqueous emulsion mainly composed of an ester- or polyester- (Solid content) / water-soluble powder ratio of 1 to 20% by weight, wherein the ester type water-based urethane resin has an average particle diameter of 20 탆 or less and the ester type aqueous urethane resin (solid content) 10 parts by weight of an auxiliary agent having a cement ratio of 1 to 25% by weight is added and mixed.

That is, the polyurea composition according to the present invention is a polyurea composition composed of a subject containing an isocyanate group-containing compound and a curing agent containing an aromatic polyamine, wherein the alicyclic monocarboxylic acid having a carbon number of 12 to 24 and the monoorol having a carbon number of 1 to 10 And a plasticizer having a viscosity of 15 mPas or less at 15 占 폚.

The polyurea composition can provide a composition which is excellent in workability at a sufficiently low point and hardened at room temperature, excellent in appearance of the coating film after curing, mechanical strength and top coat without using a solvent.

Also, the polyurea composition is an isocyanate-terminated urethane prepolymer obtained by reacting a polyoxypropylene polyol with isylene ether group-containing compound or 4,4'-diphenylmethane diisocyanate.

And, the polyurea composition can provide a polyurea composition having less problem of safety because of low odor of the subject and having sufficient curability.

Also, in the polyurea composition, the aromatic polyamine is a mixture of at least one selected from the group consisting of 4, 4 methylene bis (2-chloroaniline), bismethylthiotoluene diamine, and diethyltoluene diamine.

The polyurea composition can provide a polyurea composition which is sufficiently satisfactory in curing at room temperature and is excellent in mechanical strength and growth performance of the obtained cured product.

Further, the polyurea composition includes 1 to 30% by weight of a plasticizer based on the total amount of the composition.

In addition, the polyurea composition can provide a polyurea composition having a sufficiently low workability at a sufficiently low temperature without using a solvent and having excellent adhesiveness to a topcoat.

In addition, the polyurea composition is a hand-type or quick-curing spray type waterproofing material, a flooring material, and can provide a handmade type or quick-curing spray type composition having good workability.

In the polyurea composition, the polyurea composition preferably contains one or more kinds of aliphatic monocarboxylic acids having 12 to 24 carbon atoms and esters of monools having 1 to 10 carbon atoms (hereinafter referred to as an aliphatic monocarboxylic acid alkyl ester) A plasticizer having a viscosity of 15 mPas or less is used.

Here, the plasticizer comprising one or more of the above-mentioned aliphatic monocarboxylic acid alkyl esters preferably has a viscosity of 1 to 15 mPas at 15 캜, particularly preferably 3 to 10 mPas.

By using one or more of the above-mentioned aliphatic monocarboxylic acid alkyl esters as a plasticizer, the viscosity of the mixture of the subject and the curing agent can be greatly lowered without using a solvent.

In addition to the aliphatic monocarboxylic acid alkyl ester, the aliphatic monocarboxylic acid having 12 to 24 carbon atoms and the diol having 2 to 10 carbon atoms and the diester may be used in combination as the plasticizer of the polyurea composition according to the present invention.

Examples of the aliphatic monocarboxylic acid having 12 to 24 carbon atoms include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, babycosen, linoleic acid, linolenic acid, eicosanoic acid, docosanoic acid, And the like.

As the monool having 1 to 10 carbon atoms, a monool having 1 to 5 carbon atoms is particularly preferable, and methanol is most preferable.

Further, monocarboxylic acid alkyl ester compounds obtained by modifying vegetable oils and animal fats are also exemplified.

In the polyurea composition according to the present invention, the monocarboxylic acid methyl ester mixture, which is a methanol ester of fatty acids such as soybean oil fatty acid, ferric fatty acid and rapeseed fatty acid, has a low viscosity (viscosity at 5 DEG C of 5 to 8 mPas) desirable.

On the other hand, general purpose plasticizers such as dioctyl phthalate dibutyl phthalate zononylphthalate nonyl, adipate dioctyl, chlorinated paraffin, and petroleum plasticizers can be used in small quantities, but since they can not obtain a sufficient viscosity reduction effect, they are not used .

If used together, the amount thereof is preferably 50% by weight or less, more preferably 30% by weight or less based on the total amount of the plasticizer including the aliphatic monocarboxylic acid alkyl ester.

In the polyurea composition according to the present invention, an aliphatic monocarboxylic acid alkyl ester is preferably used as a plasticizer in an amount of 2 to 15% by weight based on the total amount of the composition.

If the amount of the plasticizer used is less than 2% by weight, a sufficient viscosity reduction effect can not be obtained, and the cured coating film having a content of more than 15% by weight tends to bleed, and the adhesiveness of the topcoat is lowered.

The plasticizer can be added to the resin and / or the curing agent, but it is preferable to add the plasticizer to the curing agent in the hand-drawn type composition.

Curing Agent The above plasticizer is added to make the filler more uniformly and efficiently kneaded, and the appearance of the surface of the cured coating film becomes prominent.

The addition amount thereof is preferably 30% by weight or less, more preferably 5 to 25% by weight in the curing agent.

On the other hand, in the composition of the quick-cure spray type, since the resin has a particularly high viscosity, it is preferable to add a plasticizer to the resin.

Since the viscosity is lowered by using the above-mentioned plasticizer, it is necessary to warm the resin and the curing agent to 50 to 70 캜 at the time of spraying in the past, but it can be sufficiently applied by heating at about 40 to 60 캜.

The addition amount thereof is preferably 30% by weight or less, more preferably 5 to 25% by weight of the resin.

Examples of the isocyanate group-containing compound contained in the subject in the polyurea composition according to the present invention include polyisocyanate and an isocyanate-terminated urethane prepolymer obtained by reacting a polyol with a polyisocyanate.

These may be used alone or in a mixture of both.

Examples of the polyisocyanate include an aromatic polyisocyanate having two or more isocyanate groups, an aliphatic polyisocyanate or a modified polyisocyanate.

The polyurea composition according to the present invention is preferably an aromatic polyisocyanate or a modified product thereof. Specific examples thereof include 4,4-diphenylmethane diisocyanate (hereinafter referred to as MDI), polyphenylpolymethylene polyisocyanate (hereinafter referred to as CMI MDI) Carbodiimide-modified diphenylmethane diisocyanate (hereinafter referred to as carbodiimide-modified MDI), and the like are particularly preferable.

These may be used alone or in a mixture of both.

Examples of the polyol to be used as a starting material for the isocyanate-terminated prepolymer include polyester polyol, polyether polyol such as polyoxypropylene polyol, polyoxypropylene oxyethylene polyol, and polyoxytetramethylene glycol, castor oil-based polyol, polybutadiene- .

The castor-based polyol refers to a modified polyol obtained by introducing a hydroxyl group into castor oil and castor oil.

In the polyurea composition according to the present invention, a polyether polyol is preferable and a polyoxypropylene polyol is more preferable.

Mixtures of polyoxypropylene diol and polyoxypropylene triol are also preferably used.

In this case, the molar ratio is preferably 60 to 90/40 to 10.

The hydroxyl number of the polyol is preferably 2 to 4, more preferably 3 or less, particularly preferably 25 or less, and even more preferably 21 to 24 on average.

When the number of hydroxyl groups is less than 2, it is difficult to increase the molecular weight of the cured coating film, so that the mechanical strength of the cured product becomes insufficient. When the number of hydroxyl groups exceeds 4, the crosslinking density becomes too high.

The hydroxyl value of the polyol is preferably 15 to 80 mg KOH / g, more preferably 40 to 70 mg KOH / g when used in a hand-drawn type composition.

On the other hand, when used in the composition of the quick-cure spray type, 25 to 280 mg KOH / g is preferable, and 30 to 115 mg KOH / g is particularly preferable.

If the hydroxyl value and the hydroxyl value are out of the above range, the resulting cured coating film is insufficient in mechanical strength or in the elasticity and growth of the cured coating film. The molecular weight of the polyol is preferably from 150 to 7,000, more preferably from 700 to 1,500, in terms of the viscosity of the obtained prepolymer, the strength of the cured coating film, and the elongation performance.

Examples of the polyisocyanate as a raw material of the isocyanate group-terminated urethane prepolymer include the polyisocyanate and the like.

When the polyurea composition according to the present invention is used in a hand-drawn type composition, it is preferable to use isoprene isocyanate in view of the viscosity, curability and mechanical strength of the cured coating film of the obtained prepolymer. A lylene isocyanate having a mass% or more is preferable.

On the other hand, when used in compositions of the fast cure spray type, MDI is preferred in terms of curability.

The isocyanate group content of the isocyanate group-terminated urethane prepolymer is preferably from 2 to 5% by weight for hand-painted type water repellents, from 4 to 8% by weight for flooring materials, and from 8 to 15% by weight for waterproofing materials.

It is preferable that 10 to 15 wt% of the waterproof material of the quick-cure spray type, 15 to 25 wt% of the bottom material, and 15 to 30 wt% of the spray material are used.

Examples of the aromatic polyamines contained in the curing agent of the polyurea composition according to the present invention include 4,4-methylenebis (2-chloroaniline), bismethylthiotoluenediamine, diethyltoluenediamine, 4,4- Chloro-2,6-diethylaniline) and the like.

In the polyurea composition according to the present invention, one or a mixture of two or more selected from the group consisting of 4,4-methylenebis (2-chloroaniline), bismethylthiotoluenediamine, and diethyltoluenediamine is preferable.

In addition, when the aromatic polyamine is used together with a polyol having a relatively high molecular weight, an appropriate curing property can be obtained.

The number of hydroxyl groups in the polyol used as the curing agent is preferably 2 to 4, more preferably 2 to 3.

The hydroxyl value is preferably 10 to 112 mgKOH / g, more preferably 16 to 56 mgKOH / g.

The polyol is preferably a polyoxypropylene polyol.

If the number of hydroxyl groups is less than 2, it is difficult to increase the molecular weight of the cured coating film, so that the curing property deteriorates and the mechanical strength of the cured product becomes insufficient and the crosslinking density exceeding 4 hydroxyl groups is too high.

If the hydroxyl value is less than 10 mgKOH / g, the viscosity of the polyol is increased. If the hydroxyl value is more than 112 mgKOH / g, the molecular weight is small and the amount of the curing agent is decreased.

This polyol is preferably obtainable by reacting propylene oxide with 2 to 4 hydroxyl groups, and more preferably 2 to 3 hydroxyl groups.

Further, the curing agent includes a curing catalyst for satisfying sufficient curability.

As the curing catalyst, a known catalyst for promoting the urea urethanization reaction can be used, and examples thereof include organic lead and organic acid tertiary amine compounds.

In addition, the curing agent may include, in addition to the basic components, an additive selected from fillers, pigments, and stabilizers.

Examples of the filler include calcium carbonate, talc, clay, silica, and carbon.

Examples of the pigment include inorganic pigments such as chromium oxide and titanium oxide, and organic pigments such as phthalocyanine pigment. Examples of the stabilizer include an antioxidant, an ultraviolet absorber, and a dehydrating agent which are generally used in a polyurea / polyurethane resin.

The polyurea composition of the present invention does not mean that the polyurea composition substantially includes a solvent that is included in advance in an additive or the like that does not contain a solvent but does not include a solvent added for the purpose of viscosity reduction.

Specifically, the content of the solvent in the base and curing agent is 3% by weight or less, more preferably 1% by weight or less.

The molar ratio NCO / (NH 2 + OH) of the isocyanate group in the resin to the active hydrogen-containing group in the curing agent in the polyurea composition according to the present invention is preferably 10 to 13. If the molar ratio is less than 10, sufficient mechanical strength of the cured coating film may not be obtained or a tack may remain on the surface of the coating film.

When the molar ratio is 13 or more, excess isocyanate groups are liable to bloom by the influence of moisture, or a cured coating film brittleness tendency is seen.

On the other hand, examples of the polyurea composition according to the present invention include an ester type aqueous urethane resin, a hydraulic powder, an aggregate and an admixture as essential components, and the ester type aqueous urethane resin is an ester type or polyester type aqueous urethane resin Wherein the ester-type water-based urethane resin has an average particle diameter of 20 占 퐉 or less and the ester-type water-based urethane resin (solid content) / water-soluble powder ratio is 1 - 20% by weight, and the ester type water-based urethane resin (solid content) / cement ratio is 1 to 25% by weight.

The ester type water-based urethane resin is a water-soluble resin or an aqueous emulsion mainly composed of an ester or polyester type water-based urethane resin component, and is a self-emulsifying type or a forced emulsifying type. In addition, these are fine particles having an average particle diameter of 20 μm or less and good bonding with water, and increased viscosity, fluidity, pharyngeal fragmentation, bridging and so forth due to the properties of the polyurea composition when mixing powder and dough including a high-performance reducing agent and a high- Resistance to material separation, etc., that is, workability is improved.

As a result, improvement in adhesion strength with finished concrete base material, reduction in drying shrinkage, difficulty in cracking, improvement in bending strength, elasticity and suppression of penetration of corrosive factors in the external environment are remarkably improved.

Particularly, the ester-type water-based urethane resin is a water-soluble resin or an aqueous emulsion mainly composed of an ester or polyester type water-based urethane resin component, and is a self-emulsifying type or a forced emulsifying type.

The water-soluble resin or the water-based emulsion mainly comprising the ester-type or polyester-type water-based urethane resin component includes an ester-type ester-based resin.

Here, the water-based urethane resin is a state in which polyurethane or its prepolymer is dispersed in water.

The water-based urethane resin can be classified into three kinds of colloidal dispersion of 0001 to 01 占 퐉 in aqueous solution and emulsion in aqueous solution of more than 01 占 퐉 according to the particle size thereof, but it is preferable that the average particle diameter of the present invention is not more than 20 占 퐉.

The water-soluble resin or water-based emulsion mainly comprising the ester-type or polyester-type water-based urethane resin component is an aliphatic amorphous-sulfur-modified) and an aromatic isocyanate-based (sulfur-modified).

Further, the water-soluble resin or the water-based emulsion mainly composed of the ester-type or polyester-type water-based urethane resin component is anionic, cationic, nonionic weak anionic and nonionic / weak anionic.

The ester type water-based urethane resin is a water-soluble resin or an aqueous emulsion mainly composed of an ester type or polyester type aqueous urethane resin component, and has a glass transition temperature (Tg) of -60 캜 to 50 캜.

The ester-type water-based urethane resin (solid content) / hydraulic powder ratio is preferably 1% by weight to 20% by weight.

In the polyurea composition according to the present invention, the ester type aqueous urethane resin (solid content) / cement ratio is in the range of 1 to 25% by weight.

In the polyurea composition of the present invention, the hydraulic powder hardens or coagulates when mixing with water.

In the polyurea composition according to the present invention, the aggregate may be an inorganic aggregate or an organic aggregate.

In the polyurea composition of the present invention, the admixture is classified into an admixture and an admixture.

The admixture is a total guide system of siliceous fine powder, limestone fine powder and anti-seizure agent, lime-based coloring agent, and aged steel admixture.

In addition, the admixture can be selected from the group consisting of AE agent, water reducing agent, AE water reducing agent, high performance water reducing agent, high performance AE water reducing agent, fluidizing agent for improving the workability, accelerator for controlling the setting time of the setting, retarding agent, The other foam inhibitor and foaming agent are moisturizing agent (thickener), drying shrinkage reducing agent, antifoaming agent and the like.

In the rubber latex system, there are styrene butadiene rubber, chloroprene rubber, methyl methacrylate butadiene rubber, acrylonitrile butadiene rubber, and resin emulsion type in the natural rubber latex and the synthetic rubber latex type are poly There are mixed latexes and mixed emulsions of acrylic acid ester, ethylene vinyl acetate, styrene acrylic acid ester, vinyl propionate, polypropylene, polyvinyl acetate, epoxy resin asphalt and rubber mixture of asphalt and paraffin.

As the emulsion type powder resin (including powder emulsion), there are ethylene vinyl acetate, vinyl acetate vinyl acetate, styrene acrylic acid ester, and polyacrylic acid ester.

The water-soluble polymer (including the monomer) includes a cellulose derivative, polyvinyl alcohol, and an acrylate. The liquid polymer may be used in combination with an unsaturated polyester resin, an epoxy resin, or the like.

Hereinafter, the maintenance and surface protection of the concrete structure using the mortar of the polyurea composition according to the present invention will be described.

FIG. 1 is a process diagram showing a construction process of a concrete structure using mortar of a polyurea composition according to the present invention, and FIG. 2 is a sectional view showing a construction state of a concrete structure with a mortar of a polyurea composition according to the present invention to be.

As shown in these drawings, the method for repairing and protecting the surface of a concrete structure using the polyurea composition mortar according to the present invention comprises the steps of (S 1) chipping a deteriorated portion of a concrete structure; Removing the rust of the reinforcing bars of the deteriorated portion (S2); (S 3) washing the rust removal part of the reinforcing bar with high pressure water at a high pressure; Applying a primer to the surface of the deteriorated portion of the high-pressure concrete structure to form a primer layer (S 4); (S 5) filling and applying the background adjustment material on the undercoat layer to form the intermediate layer; And a step (S6) of forming a top layer by coating the surface of the intermediate layer with a polyurea composition to a predetermined thickness and a predetermined shape.

That is, the method for repairing and protecting the surface of a concrete structure using the polyurea composition mortar according to the present invention comprises: (1) chipping the deteriorated portion of the concrete structure; (2) removing the reinforcing steel rust; (S 3) washing the chipped portion of the concrete structure (S 3); applying a primer (S 4) to the surface of the high pressure cleaned concrete structure; (S 5) filling the surface of the primer onto the surface of the primer, and applying a polyurea composition (S 6) on the surface of the primer, in order to repair the surface of the concrete structure and repair the coating.

Here, the chipping step S 1 of the concrete structure chipping the deteriorated portion of the concrete structure.

In other words, the chipping of the concrete structure at the deteriorated site concrete should minimize the impact on the existing concrete structure by the pneumatic hammer, not the hydraulic hammer, and the uniformity of the roughness should be minimized, Breaking (breaking) and grinding of the surface of the grinder are applied together with chipping to allow bonding of new and old concrete structures.

 Subsequently, the step of removing the reinforcing steel rust (S 2) removes the rust of the reinforcing bar exposed to the outside as a deteriorated portion of the concrete structure and applies the rust preventing agent.

Subsequently, the high pressure cleaning step (S 3) cleans the chipping portion and the rebar anti-rust portion of the concrete structure with a cold / hot water high pressure washer.

Next, the primer application step (S 4) is a step of applying a urethane resin mixture 70 to 90 in which the urethane acrylate resin and the polymethyl methacrylate resin are mixed in a ratio of 10 to 60: 90 to 40 by weight to the deteriorated portion of the high- And 10 to 30% by weight of a latex resin is applied at a constant thickness and number of times to form a primer layer.

Subsequently, the ground adjusting agent filling step (S 5) is carried out such that 40 to 60 wt% of the sand, 10 to 25 wt% of calcium sulfoaluminate, 10 to 25 wt% of the cement, 0.15 to 5 wt% of a curing retardant, 0.05 to 5 wt% of a curing retarder, 0.5 to 10 wt% of an acrylic resin, and 2 to 10 wt% of an elastic resin is filled and applied to form an intermediate layer.

Subsequently, the polyurea composition application step (S6) comprises: a subject comprising an isocyanate group-containing compound on the surface of the background adjusting material; A polyurea composition comprising a curing agent comprising an aromatic polyamine, wherein the polyurea composition has a viscosity of 20 mPa 占 퐏 at 20 占 폚 and comprising at least one ester of an aliphatic monocarboxylic acid having 12 to 24 carbon atoms and a monool having a carbon number of 1 to 10 Wherein the isocyanate group-containing compound is an isocyanate-terminated urethane prepolymer obtained by reacting a polyoxypropylene polyol with a toluene isocyanate or 4,4'-diphenylmethane diisocyanate, and the aromatic polyamine is an isocyanate group- A mixture of one or more selected from the group consisting of 4'-methylene bis (2-chloroaniline), bismethylthiotoluenediamine and diethyltoluenediamine, and the plasticizer is applied in an amount of 1 to 30 wt% do or,

Or a water-soluble resin or an aqueous emulsion mainly comprising an ester type water-based urethane resin, a hydraulic powder, an aggregate and an admixture as essential components, wherein the ester type aqueous urethane resin is an ester type or polyester type aqueous urethane resin component, Wherein the ester type water-based urethane resin has an average particle diameter of 20 占 퐉 or less and the ester type water-based urethane resin (solid content) / hydraulic oil fraction is 1 to 20% by weight, and the ester type aqueous urethane resin ) / Cement ratio of 1 to 25% by weight is applied to form a top layer.

Next, 50% of titanium dioxide (TiO2) sol prepared by adding Ti [OCH (Cl3) 2] 4, (CH3) 2 CHOH in a weight ratio of 1: 1 on the surface of the polyurea composition; 40% silica sol prepared by mixing C8H20O4Si, (CH3) CHOH in a weight ratio of 1: 1; 9% zinc oxide sol made of Zn (C2H3O2) 2; The titanium dioxide composition consisting of 1% of metal ions is applied at a ratio of 1 part by weight to 100 parts by weight of the top coat material to form a top coat layer.

On the other hand, 5 to 10 parts by weight of a ceramic composition is added to 100 parts by weight of the polyurea composition mortar, and the ceramic composition comprises 4 to 20% by weight of magnesium oxide, which is either magnesium or molybdenum magnesium; 5 to 20% by weight of a phosphate comprising at least one of ammonium phosphate (NH4H2PO4), potassium phosphate (KH2PO4) and sodium phosphate (NaH2PO4); 10 to 20% by weight of a silicate consisting of at least one of meta kaolin, silica fume, blast furnace slag and fly ash; 50 to 83.5% by weight of a retarder composed of at least one of stearic acid, borax, boric acid and sodium gluconate, 5 to 20% by weight of a fluidizing agent, 1 to 10% by weight of a water repellent agent, polyvinyl alcohol fiber (PVA) 1 to 10% by weight of an additive comprising 0.5 to 2% by weight of a fiber composed of one of nylon fibers (NY) and polyethylene fibers (PE) and 10 to 20% by weight of lime; 30 to 80% by weight of fine aggregate composed of natural sand, artificial silica sand, and hollow lightweight aggregate.

Also, the polyurea composition is added in an amount of 5 to 10 parts by weight based on 100 parts by weight of the polyurea composition mortar, and the polyurea composition is an ester of an aliphatic monocarboxylic acid having 12 to 24 carbon atoms and a monool having 1 to 10 carbon atoms Containing compound having a viscosity of 20 mPas or less at 20 캜 and composed of one or more isocyanate group-containing compounds obtained by reacting polyoxypropylene polyol with 4,4'-diphenylmethane diisocyanate or 4,4'-diphenylmethane diisocyanate Terminated urethane prepolymer, wherein the aromatic polyamine is a mixture of at least one member selected from the group consisting of 4,4'-methylene bis (2-chloroaniline), bismethylthiotoluene diamine, and diethyltoluene diamine, By weight based on 100% by weight of the composition including 1 to 30% by weight based on the total amount of the composition, Based water-based urethane resin, a water-based powder, an aggregate and an admixture are essential components and the ester-type water-based urethane resin is a water-soluble resin or an aqueous emulsion mainly composed of an ester- or polyester- (Solid content) / water-soluble powder ratio of 1 to 20% by weight, wherein the ester type water-based urethane resin has an average particle diameter of 20 탆 or less and the ester type aqueous urethane resin (solid content) 10 parts by weight of an auxiliary agent having a cement ratio of 1 to 25% by weight is added and mixed.

As described above, the polyurea composition mortar according to the present invention and the method for repairing the cross-section of the concrete structure and the surface protection method using the same have a function of water-proofing of the antimicrobial property, and the microorganism is inhabited as a natural- Polyurea material has negative ion generating effect, it can control the hardening rate according to the maintenance position of concrete structure, convenient to mix mortar with resin, easy to repair, easy to repair and re-work, It can be applied according to the requirements of the site. By using the polyurea composition mortar as the main material, it is possible to control the curing time of the concrete structure and the curing time of 1 hour or 1 hour to 2 days after repairing the section. And reinforced construction, and has a molecular binding of at least 98% It maintains the shape of triple net without cavities and it is resistant to external impact and abrasion. It has excellent creep, dry shrinkage and crack prevention. It does not react to calcium chloride and does not react with alkali aggregate. It is advantageous for sewage treatment plant, wastewater treatment plant, sewer pipe repair, etc. because it does not have chemical reaction even with strong acid such as sulfuric acid. It is advantageous for structures that behave like bridges by restraining impact, vibration absorption and cracking, and it has a strong effect to prevent ultraviolet damage due to realization of complete waterproofing, strong ultraviolet rays, and abrasion by weathering.

It should be understood that the preferred embodiments described in the description of the invention are illustrative and not restrictive and that the scope of the invention is indicated by the appended claims, .

100: Substrate material 200: Heavy material
300: Top material C: Concrete structure
S: Rebar

Claims (6)

A polyurethane composition mortar comprising a base material, a middle material and a top material,
Wherein the primer is composed of 70 to 90% by weight of a urethane resin mixture mixed with 10 to 60: 90 to 40% by weight of a urethane acrylate resin and a polymethyl methacrylate resin, and 10 to 30% by weight of a latex resin, Wherein the cementitious material comprises 40 to 60% by weight of sand, 10 to 25% by weight of calcium sulfoaluminate, 10 to 25% by weight of cement, 0.15 to 5% by weight of a fluidizing agent, 0.05 to 5% Wherein the topcoat comprises an ester-type water-based urethane resin, a hydraulic powder, an aggregate and an admixture as essential components, and the ester-type water-based urethane The resin is a water-soluble resin or an aqueous emulsion mainly composed of an ester-based or polyester-based water-based urethane resin component, is a self-emulsifying type or a forced emulsifying type, (Solid content) / cement ratio of 1 to 25% by weight based on the weight of the ester-type water-based urethane resin (solid content) / hydraulic oil-containing powder is 1 to 20% Wherein the polyurea composition is added in an amount of 5 to 10 parts by weight based on 100 parts by weight of the polyurethane composition mortar and the polyurea composition is an ester of an aliphatic monocarboxylic acid having 12 to 24 carbon atoms and a monool having 1 to 10 carbon atoms Containing compound having a viscosity of 20 mPas or less at 20 캜 and composed of one or more isocyanate group-containing compounds obtained by reacting polyoxypropylene polyol with 4,4'-diphenylmethane diisocyanate or 4,4'-diphenylmethane diisocyanate Terminated urethane prepolymer, wherein the aromatic polyamine is 4,4'-methylenebis (2-chloroaniline), bis Methylthiotoluene diamine, and diethyltoluene diamine, wherein the plasticizer is contained in an amount of 1 to 30% by weight based on the total amount of the composition, based on 100 parts by weight of the ester, , Water-soluble powder, aggregate and admixture are essential components and the ester type water-based urethane resin is a water-soluble resin or an aqueous emulsion mainly composed of an ester type or polyester type aqueous urethane resin component, (Solid content) / cement ratio of 1 to 20% by weight, wherein the ratio of the ester-type water-based urethane resin (solid content) / the water-soluble powder is 1 to 20% To 25% by weight of an adjuvant composed of 10% by weight of a polyurea composition Mortar. The method according to claim 1,
5 to 10 parts by weight of a ceramic composition is added to 100 parts by weight of the polyurea composition mortar, and the ceramic composition comprises 4 to 20% by weight of magnesium oxide, which is one of tin magnesium and molten magnesium; 5 to 20% by weight of a phosphate comprising at least one of ammonium phosphate (NH4H2PO4), potassium phosphate (KH2PO4) and sodium phosphate (NaH2PO4); 10 to 20% by weight of a silicate consisting of at least one of meta kaolin, silica fume, blast furnace slag and fly ash; 50 to 83.5% by weight of a retarder composed of at least one of stearic acid, borax, boric acid and sodium gluconate, 5 to 20% by weight of a fluidizing agent, 1 to 10% by weight of a water repellent agent, polyvinyl alcohol fiber (PVA) 1 to 10% by weight of an additive comprising 0.5 to 2% by weight of a fiber composed of one of nylon fibers (NY) and polyethylene fibers (PE) and 10 to 20% by weight of lime; And 30 to 80% by weight of a fine aggregate composed of natural sand, artificial silica sand, and hollow lightweight aggregate. delete Chipping the deteriorated portion of the concrete structure (S 1); Removing the rust of the reinforcing bars of the deteriorated portion (S2); (S 3) washing the rust removal part of the reinforcing bar with high pressure water at a high pressure; Applying a primer to the surface of the deteriorated portion of the high-pressure concrete structure to form a primer layer (S 4); (S 5) filling and applying the background adjustment material on the undercoat layer to form the intermediate layer; (S6) applying a polyurea composition to a surface of the intermediate layer in a predetermined thickness and a predetermined shape to form an upper layer, wherein the lower layer comprises a urethane acrylate resin and a polymethyl methacrylate resin, 60 to 90 weight percent of a urethane resin mixture mixed with 70 to 90 weight percent of a urethane resin mixture and 10 to 30 weight percent of a latex resin, wherein the background adjuster comprises 40 to 60 weight percent of sand, calcium sulfoaluminate 10 to 25% by weight of cement, 0.15 to 5% by weight of a fluidizing agent, 0.05 to 5% by weight of a curing retarder, 0.5 to 10% by weight of an acrylic resin and 2 to 10% by weight of an elastic resin Wherein the polyurea composition comprises an ester type aqueous urethane resin, a hydraulic powder, an aggregate and an admixture as essential components, wherein the ester type aqueous urethane resin is an ester type or polyester type aqueous urethane resin component Wherein the ester-type water-based urethane resin has an average particle diameter of 20 占 퐉 or less and the ester-type water-based urethane resin (solid content) / water-soluble powder ratio is 1 to 20 Wherein the polyurea composition is added in an amount of 5 to 10 parts by weight based on 100 parts by weight of the polyurea composition mortar composed of the ester type water-based urethane resin (solid content) / cement ratio of 1 to 25% by weight, Contains a plasticizer having a viscosity of 20 mPas or less at 20 캜 and composed of one or more kinds of esters of an aliphatic monocarboxylic acid having 12 to 24 carbon atoms and a monool having 10 to 10 carbon atoms and the isocyanate group- An isocyanate group obtained by reacting a polyol with a toluene isocyanate or 4,4'-diphenylmethane diisocyanate Wherein the aromatic polyamine is a mixture of at least one member selected from the group consisting of 4,4'-methylene bis (2-chloroaniline), bismethylthiotoluene diamine, and diethyltoluene diamine, Wherein the ester type water-based urethane resin, the hydraulic powder, the aggregate and the admixing material are composed of essential components and the ester type water-based urethane resin is an ester type or a polyester Based urethane resin component is a water-soluble resin or a water-based emulsion mainly composed of a self-emulsifying type or a forced emulsifying type, the ester type aqueous urethane resin having an average particle diameter of 20 탆 or less and the ester type aqueous urethane resin (solid component) (Solid content) / cement ratio is 1 to 20% by weight, and the ratio of the ester-type water-based urethane resin (solid content) 25 wt.% Of the polyurea composition mortar is added and mixed. 5. The method of claim 4,
5 to 10 parts by weight of a ceramic composition is added to 100 parts by weight of the polyurea composition mortar, and the ceramic composition comprises 4 to 20% by weight of magnesium oxide, which is one of tin magnesium and molten magnesium; 5 to 20% by weight of a phosphate comprising at least one of ammonium phosphate (NH4H2PO4), potassium phosphate (KH2PO4) and sodium phosphate (NaH2PO4); 10 to 20% by weight of a silicate consisting of at least one of meta kaolin, silica fume, blast furnace slag and fly ash; 50 to 83.5% by weight of a retarder composed of at least one of stearic acid, borax, boric acid and sodium gluconate, 5 to 20% by weight of a fluidizing agent, 1 to 10% by weight of a water repellent agent, polyvinyl alcohol fiber (PVA) 1 to 10% by weight of an additive comprising 0.5 to 2% by weight of a fiber composed of one of nylon fibers (NY) and polyethylene fibers (PE) and 10 to 20% by weight of lime; And 30 to 80% by weight of a fine aggregate composed of natural sand, artificial silica sand, hollow hollow lightweight aggregate, and the like. delete

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