KR102268417B1 - Composition of Room Temperature Rapid Hardening Epoxy Crack Injection Materials Including Inorganic Fillers Modified Rapid Hardening Silane Coupling Agents - Google Patents

Abstract

The present invention relates to a room-temperature fast-diameter epoxy cracking injection composition used for repairing cracks in structures built with concrete, wherein vehicle traffic such as concrete and tunnels used in the manufacture of concrete roads, expansion joints of bridges and bridge bearings In order to quickly repair cracks that occur in frequent concrete structures, the wettability of the epoxy crack injection agent is improved so that the permeability is excellent. , It provides a room temperature fast-setting epoxy-based crack injection composition having high adhesive strength and tensile strength, and low curing shrinkage and elongation.

Description

A composition of Room Temperature Rapid Hardening Epoxy Crack Injection Materials Including Including Inorganic Fillers Modified Rapid Hardening Silane Coupling Agents

The present invention is a two-component epoxy-based crack injection agent consisting of a main agent and a curing agent, a main agent comprising a bisphenol A-type epoxy resin, a Carboxylic Terminated Butadiene Acrylonitrile (CTBN) modified epoxy resin, an epoxy silane coupling agent, and a functional additive; A two-component composition consisting of a modified aliphatic amine curing agent, an inorganic filler modified with a fast-hardening silane coupling agent, and a curing agent including a dispersant; It relates to a room temperature fast-setting epoxy-based homogeneous injection composition used for crack injection of concrete structures having excellent adhesive strength and tensile strength, and excellent durability due to the characteristics of low curing shrinkage and elongation at tensile failure.

In general, the concrete structure deteriorates due to aging or environmental factors such as external impact over a certain period of time, and cracks occur, and the cracked area continues to expand, reducing the durability of the concrete structure.

In particular, concrete structures such as concrete and tunnels used in the manufacture of concrete roads, expansion joints of bridges and bridge bearings are subject to the increase and enlargement of vehicles, chemical action by seawater, wastewater and snow removal agents, and material fatigue due to repeated loads. Cracks occur in concrete at an early stage due to environmental factors such as, and if cracks are not repaired in a timely manner, the generated cracks will expand further and deteriorate the long-term durability of concrete.

As described above, repair methods for cracks generated in concrete structures can be broadly classified into surface treatment methods, injection methods, and filling methods.

First, the surface treatment method is applied for the purpose of improving waterproofness and durability by forming a coating film on fine cracks with a crack width of 0.2 mm or less. There are a method of covering only the cracked area and a method of covering the entire surface.

Next, the injection method is a method to improve waterproofness and durability by injecting synthetic resin or cement-based materials into cracks, and it can be applied even when the finishing material is floating from the concrete matrix.

Lastly, the filling method is a method suitable for repair when the width of the crack is relatively large (0.5mm or more). It is a method of finishing the mortar or cutting the concrete according to the crack and filling the cut part with a repair material.

On the other hand, epoxy resin is generally used as an injection material for crack repair of concrete structures due to its high compressive and tensile strength and excellent adhesion. Concrete Structure Reinforcement Method Using Injection Type Epoxy Composition” and Patent Registration No. 10-1819919 “Crack Repair Reinforcement Composition Using Epoxy Resin and Construction Method Using Epoxy Resin”, etc. are presented.

However, the epoxy-based crack injection agent as described above takes 24 to 48 hours to develop strength after being injected into the crack and hardened. Therefore, when an epoxy-based crack injection agent is used for cracks occurring in concrete structures with frequent vehicle traffic, such as concrete and tunnels used in the manufacture of concrete roads, expansion joints of bridges, and bridge bearings, time limiting vehicle traffic In the case of an epoxy-based crack injection agent with a slow strength development time, in case of partial traffic restrictions, continuous vibration and impact energy are transmitted while curing is in progress, resulting in poor curing, poor adhesion, etc. There is a very high possibility that the same problem will occur, which incurs direct and indirect costs.

In order to solve this problem, it is necessary to develop a fast-diameter epoxy-based crack injection agent. Accordingly, at room temperature, the quick-acting epoxy cracking injection agent of S company, which has a pot life of 30±10 minutes, a hard-to-touch curing time of 3±1 hours, and a complete curing time of 8-12 hours, is used in Korea, but the above problems is not sufficient to solve the problem.

In addition, in general, epoxy resins can achieve the purpose of curing by mixing a curing agent, but do not meet the purpose of use, use and conditions, etc., and thus, auxiliary materials are required to satisfy this. Therefore, in order to use the epoxy resin as a crack injection agent, it is necessary to mix the epoxy resin composition to facilitate penetration into concrete cracks, a curing accelerator for accelerating the curing speed, and a reduction in the coefficient of thermal expansion of the cured resin, reduction in curing shrinkage, improvement of dimensional stability, etc. Fillers are required.

In addition, the mixing ratio of the high-viscosity epoxy resin and the low-viscosity epoxy resin with excellent compatibility is important for the epoxy resin to control the viscosity, and the mechanical, thermal, and chemical properties change after curing the epoxy resin depending on the compatibility and the mixing ratio. have.

On the other hand, 3-Glycidoxypropyltrimethxysilane (hereinafter referred to as GPTMS) is added as an epoxy silane coupling agent to the main epoxy resin to improve the adhesion strength of inorganic and organic materials.

In the above, as a curing accelerator for accelerating the curing speed by the reaction of the main agent and the curing agent, -OH, -COOH, -SO ₃ H, -CONH ₂ , -CONHR, -SO ₃ NH ₂ , -SO ₃ A compound having a functional group such as NHR is used, and when an amine-based epoxy curing agent is used, phenols such as Phenol, Cresol, NonylPhenol, and Bisphenol-A and DMP-30 and PolyMercaptane series are used. As the accelerator, an organic compound such as Mercaptane having a -SH group is used.

In the above, fillers used to reduce thermal expansion, decrease in curing shrinkage, and improve dimensional stability of the epoxy cured resin are generally talc, silica, talc, calcium carbonate, wollastonite, graphite, alumina, aluminum oxide, iron, iron oxide. and the like, and examples of inorganic fillers that can be used in the epoxy resin for crack injection include silica, calcium carbonate, aluminum oxide, and the like.

In general, an epoxy resin containing an inorganic filler slows the reaction itself due to the diluting effect of the filler, so it gives good properties to the epoxy resin for injection mold production, but it needs improvement to be added to the room temperature fast-setting epoxy resin.

Regarding the surface modification of the inorganic filler as described above, Korean Patent No. 10-1744500 (registration date, June 01, 2017) discloses 20 to 45% by weight of an acrylate-based co-polymer binder, 40 to 60% by weight of an inorganic filler, and a silane couple. It contains 3 to 10 wt% of an inorganic filler surface-modified with a ring agent and 1 to 5 wt% of a functional additive, wherein the inorganic filler is light calcium carbonate, and the inorganic filler surface-modified with the silane coupling agent is a silane coupling agent. It is a wollastonite having a surface-modified average particle diameter of 6 to 12 μm, pH 8.0 to 10.0, specific gravity 2.8 to 2.92, and molecular weight 340 to 350, and the functional additive is hydroxyethyl cellulose as a thickener, an aluminum silicate-based thickening stabilizer, and a pH adjuster. An elastic putty material composition for crack repair of concrete structures is known, comprising ammonia anhydride, plasticizer dioctyl adipate, mineral oil-based antifoaming agent, isothiazole-based preservative and sodium alenate-based dispersing agent, and the silane The coupling agent is γ-aminopropyltrimethoxysilane (APS: γ-Aminopropyltrimethoxysilane), γ-glycidylpropyltrimethoxysilane (GPS: γ-Glycidylpropyltrimethoxysilane), vinylmethoxysilane (VS: Vinylmethoxysilane), γ- Mercaptopropyltrimethoxysilane (MGPS: γ-Mercaptopropyltrimethoxysilane), γ-Methacryloxypropyltrimethoxysilane (MPS: γ-Methacryloxypropyltrimethoxysilane), γ-aminopropylmethyldiethoxysilane (APDES: γ-Aminopropylmethyldiethoxysilane), At least one selected from the group consisting of γ-aminopropylmethyltriethoxysilane (APTES: γ-Aminopropylmethyltriethoxysilane), 3-glycidoxypropyltrimethoxysilane (GPTMS: 3-glycidoxypropyltrimethoxysilane), and mixtures thereof, and adhesion strength , crack followability (elongation), tensile steel There is known an elastic putty material composition for crack repair for exterior walls of buildings that has excellent resistance to bending at low temperatures, compatibility with top coats, water resistance and alkali resistance.

In addition, Korean Patent Application Laid-Open No. 10-2018-0096706 (published on August 29, 2018) discloses a method for surface treatment of a calcium carbonate-containing material, a) in the range of 5 to 90% by weight based on the total weight of the aqueous suspension. providing an aqueous suspension of at least one calcium carbonate-comprising material having a solids content, b) adjusting the pH-value of said aqueous suspension of step a) in the range of 7.5 to 12, c) step b) adding at least one surface treatment agent to the aqueous suspension obtained in step a) in an amount ranging from 0.05 to 10 mg of the surface treatment agent per m 2 of the surface area of the at least one calcium carbonate-comprising material as provided in step a). wherein the at least one surface treatment agent is a compound according to formula (I):

(Wherein R is a hydrolyzable alkoxy group, R , R and R are each independently hydrogen, a hydroxyl group, an alkyl group, a vinyl group, an alkoxy group, an acyloxy group, acryloxy group, methacryloxy group, ethacryl group Oxy group, carboxyl group, epoxy group, anhydride group, ester group, aldehyde group, amino group, ureido group, azide group, halogen group, phosphonate group, phosphine group, sulfonate group, sulfide group or disulfide group, isocycline selected from the group consisting of an anate group or a masked isocyanate group, a thiol group, a phenyl group, a benzyl group, a styryl group, and a benzoyl group, and u, v and w are independently integers from 0 to 24), d ) mixing the aqueous suspension obtained in step c) at a temperature in the range of 30 to 120° C., and e) mixing the aqueous suspension during or after step d) with the moisture content of the obtained surface-treated calcium carbonate-comprising material Calcium carbonate comprising the step of drying at a temperature in the range of 40 to 160° C. under ambient pressure or reduced pressure such that the content is in the range of 0.001 to 20% by weight, based on the total weight of the surface-treated calcium carbonate-comprising material. Methods for surface treatment of containing materials are known.

Korean Patent No. 10-1744500 and Korean Patent Application Laid-Open No. 10-2018-0096706, as described above, are added to an epoxy curing agent using an amine-based compound having alkali properties because the inorganic filler is hydrolyzed in an acidic atmosphere to hydrolyze the silane coupling agent. In this case, there is a risk that an unexpected reaction may occur and decrease the strength and overall physical properties, and since it is provided as an aqueous suspension product, it can be used for the room temperature fast-setting epoxy cracking injection composition of the present invention characterized as a solvent-free epoxy composition. can't

On the other hand, in order to be applied to repair cracks in bridge pavement, factory floor, concrete pavement, parking lot, airport runway, etc. that require shorter construction time and short-term traffic opening as a fast-diameter type, Korean Patent Registration No. 10-1736759 (registration date May, 2017) 11 days) contains 60 to 99% by weight of a fast-setting binder at room temperature, 0.1 to 30% by weight of a curing accelerator, and 0.01 to 20% by weight of an inorganic filler, and the room temperature fast-setting binder is 60 to 99% by weight of methyl methacrylate, butyl Acrylate 0.1 to 30% by weight, polybutylene terephthalate 0.1 to 20% by weight, polychlorofluoroethylene 0.01 to 20% by weight, and epoxy 0.01 to 20% by weight at room temperature with excellent strength, permeability, crack resistance and durability A fast-diameter polymer resin-based crack injection composition and a gravity crack repair method using the same. It has a high flash point, does not have a strong irritating odor, and is less volatile, so it is effective in repairing cracks in concrete because evaporation of the composition does not occur before crack penetration and curing. In addition, it is used for repairing cracks in a wide range of concrete structures due to its excellent wetting characteristics and excellent crack penetration effect. In particular, it is a fast-diameter type that shortens construction time and requires short-term traffic opening, such as bridge pavement, factory floor, and concrete pavement. A room temperature fast-diameter polymer resin-based crack injection composition that can be applied to repair cracks in roads, parking lots, airport runways, apron, etc. is presented.

In addition, Korean Patent No. 10-1832939 (registration date February 21, 2018) contains 60 to 99 wt% of a quick-drying binder and 0.01 to 20 wt% of a filling admixture, and the filling admixture is 5 to 40 wt% of sericite, siliceous 5 to 40% by weight of silica sand, 1 to 30% by weight of molybdenum, 1 to 20% by weight of magnesium silicate, 1 to 20% by weight of halloysite, 0.1 to 20% by weight of bentonite, and 0.1 to 20% by weight of a pigment, and the filling admixture is sericite 5-40 wt%, siliceous silica sand 5-40 wt%, molybdenum 1-30 wt%, magnesium silicate 1-20 wt%, halloysite 1-20 wt%, bentonite 0.1-20 wt% and pigment 0.1- A quick-drying crack injection composition for road crack repair excellent in low viscosity, high penetrability, strength, crack resistance and durability containing 20% by weight and a road crack repair method using the same, wherein yellowing by ultraviolet rays is reduced, low viscosity and high penetrability are cracked Since the composition does not evaporate before penetration and curing, it is effective for crack repair. Also, it has excellent crack penetration effect, so a quick-drying crack injection composition that can be applied to crack repair in concrete structures as well as a wide range of road pavement is proposed. have.

However, Korean Patent No. 10-1736759 and Korean Patent No. 10-1832939 both use methyl methacrylate as a main raw material, but in general, methyl methacrylate is expensive compared to epoxy resin and is a colorless, volatile liquid. It is a flammable material with a pungent odor that is absorbed into the human body through the respiratory tract and adversely affects health, and there is a problem that special attention is required during storage, transportation and operation in preparation for fire as a flammable material.

[Patent Document 001] Korean Patent 10-1744500 (Registration Date: June 01, 2017) [Patent Document 002] Korea Patent Publication 10-2018-0096706 (published on August 29, 2018) [Patent Document 003] Korean Patent 10-1736759 (Registration Date: May 11, 2017) [Patent Document 004] Korean Patent No. 10-1832939 (Registration Date February 21, 2018)

The present invention was devised to solve the above problems in view of the above problems, and it is possible to quickly repair cracks occurring in concrete structures with frequent vehicle traffic such as concrete and tunnels used in the manufacture of concrete roads, expansion joints of bridges, and bridge bearings. In providing a room temperature, fast-setting epoxy-based crack injection composition to shorten the traffic opening time by repairing it in a timely manner and by showing strength at an early stage, the crack injection composition of the present invention is a two-component type consisting of a main agent and a curing agent, The composition is a bisphenol A epoxy resin with high crystallinity and excellent compressive strength. Carboxylic Terminated Butadiene Acrylonitrile (CTBN) modified epoxy resin to supplement the impact strength of bisphenol A epoxy resin against vibration and impact due to frequent vehicle traffic, The composition is prepared by mixing Glycidoxypropyl trimethoxysilane (GPTMS) and other functional additives that improve adhesive strength, and the curing agent composition is a modified aliphatic amine-based curing agent hydrolyzed in an alkaline atmosphere with an inorganic filler and dispersant modified with a fast-setting silane coupling agent. By mixing the composition to prepare a composition, it has good penetrability into cracks in concrete, has rapid hardening by shortening the curing time, has excellent adhesive strength and tensile strength, and shows characteristics of low curing shrinkage and elongation at tensile failure. An object of the present invention is to provide a room temperature fast-diameter epoxy-based crack injection composition used for crack injection of structures.

In order to achieve the above object, the present invention is composed of a main agent and a two-component curing agent, a main composition designed to have good permeability to cracks in a concrete structure where vibration and impact energy frequently occur, and a fast-diameter silane coupling agent modified with a It provides a room temperature fast-setting epoxy-based crack injection composition, characterized in that it is composed of a curing agent composition that is designed to provide fast-setting including inorganic fillers and to exhibit excellent adhesive strength and tensile strength.

Here, the main composition is based on a bisphenol A type epoxy resin having high crystallinity and excellent compressive strength, and the bisphenol A type epoxy resin is contained in an amount of 75 to 93% by weight. Carboxylic Terminated Butadiene Acrylonitrile (CTBN) epoxy resin added with carboxylterminated butadiene acrylonitrile rubber to trifunctional aliphatic epoxy resin is blended to improve durability by dispersing vibration and impact energy to bisphenol A resin with high crystallinity and excellent compressive strength. and the CTBN epoxy resin is contained in an amount of 5 to 20% by weight.

On the other hand, Glycidoxypropyl trimethoxysilane (GPTMS), which is universally used in epoxy resins to improve adhesion strength to the main material, is contained in an amount of 0.5 to 5% by weight, and as a functional additive, a surface tension reducing agent is 0.1 to 2% by weight and an antifoaming agent is 0.1 to 2%. It is preferable to prepare it by containing it in weight %.

In the above subject, the bisphenol A-type epoxy resin is contained in an amount of 75 to 93% by weight. If the content of the bisphenol A-type epoxy resin is higher than 93% by weight, the crystallinity after curing is too high, so that the impact strength is lowered. If the content of the bisphenol A epoxy resin is less than 75% by weight, there is a problem in that adhesive strength and tensile strength including compressive strength are lowered. More preferably, it is 78 to 90% by weight.

Specific examples of such a bisphenol A epoxy resin include YD-114, YD-115, YD-119, YD-127, YD-128 sold by Kukdo Chemical Co., Ltd., and are limited thereto.

In the above subject, CTBN epoxy resin is contained in an amount of 5 to 20% by weight, since CTBN epoxy resin is modified with carboxylterminated butadiene acrylonitrile rubber, it has an effect of dispersing impact energy to improve impact strength, and there is an effect of improving adhesive strength .

At this time, if the content of the CTBN epoxy resin is higher than 20% by weight, the curing time is delayed, and the effect of improving adhesive strength and impact strength does not increase any more. If the content of the CTBN epoxy resin is lower than 5% by weight, the effect of improving adhesive strength and impact strength is insufficient.

Specific examples of the CTBN epoxy resin include KR-818, KR-450, KR-207, KR-170, KR-104, KR-100 sold by Kukdo Chemical Co., Ltd., but is not limited thereto. More preferably, it is 6-15 weight%.

In the above subject, GPTMS is contained in an amount of 0.5 to 5% by weight, and since GPTMS has an epoxy group and a silanol group in the molecular structure, it has good compatibility with the epoxy resin and has the effect of improving the adhesive strength with concrete materials. It is commonly used for resins.

When the content of GPTMS is higher than 5% by weight, the price of the product increases, and the effect of improving the adhesive strength does not increase any more. If the content of GPTMS is lower than 0.5% by weight, the amount used is too low, and the effect of improving the adhesive strength is insufficient. More preferably, it is 0.8 to 3% by weight.

In the above subject, the surface tension reducing agent is contained in an amount of 0.1 to 2% by weight, and the surface tension reducing agent has an effect of improving permeability by reducing the surface tension of the room temperature fast-diameter epoxy cracking injection composition to improve wettability, and silicone-based Surface tension reducing agents are preferred. When the content of the surface tension reducing agent is higher than 2% by weight, there is an effect of stabilizing the bubbles, there is a problem that the strength is lowered, and the effect of lowering the surface tension is not increased any more. When the content of the surface tension reducing agent is lower than 0.1% by weight, the effect of reducing the surface tension becomes insignificant.

Specific examples of the surface tension reducing agent include BYK-320, BYK-342, BYK-347, and the like, but is not limited thereto.

In the above subject, the antifoaming agent is contained in an amount of 0.1 to 2% by weight, and even if the content of the antifoaming agent is higher than 2% by weight, the antifoaming effect is no longer expressed, and when it is lower than 0.1% by weight, the defoaming effect is insufficient. Specific examples of such antifoaming agents include BYK-063, BYK-072, BYK-088, BYK-A525, BYK-A555, and the like.

The curing agent composition is prepared by containing 80 to 95% by weight of a modified aliphatic amine curing agent, 3 to 18% by weight of an inorganic filler modified with a fast-setting silane coupling agent, and 0.1 to 2% by weight of a dispersant.

The content of the modified aliphatic amine-based curing agent in the curing agent is 80 to 95% by weight. The amine-based curing agent affects the curing speed and strength with the main agent and the mixing viscosity with the main agent in the room temperature fast-setting epoxy cracking injection composition. A modified aliphatic amine-based curing agent is preferable in order to achieve a curing rate of 40±10 minutes at room temperature.

However, when a modified aliphatic amine curing agent is used for the epoxy resin, the complete curing speed at room temperature is in the range of 100 to 200 minutes, but the adhesive strength, tensile strength, and compressive strength tend to be inferior compared to other curing agents.

Specific examples of such a modified aliphatic amine-based curing agent include any from the group consisting of KH-240, KH-252, KH-500, KH-500F, KH-505, KH-506, KH-550 sold by Kukdo Chemical Co., Ltd. More than one is preferred.

The inorganic filler modified with the fast-setting silane coupling agent in the curing agent is preferably a surface of any one or more inorganic fillers selected from the group consisting of calcium carbonate, silica sand, and silica fume, modified with a silane coupling agent. More preferably, any one or more inorganic fillers selected from the group consisting of calcium carbonate, silica sand, and silica fume having a particle size in the range of 0.1 to 3 μm and a length-to-diameter ratio (L/D Ratio) of 1.5 or less in consideration of crack injectability It is preferable to modify it with a fast-hardening silane coupling agent.

In addition, the room temperature fast-setting epoxy-based cracking injection composition of the present invention is a two-component type consisting of a main agent and a curing agent, and has fast curing due to shortening of curing time, excellent adhesion strength and tensile strength at an early stage, and low curing shrinkage rate And the mixing ratio of the main composition and the inorganic filler included in the curing agent composition are modified in order to maximize the characteristics of elongation at breakage, and the fast-setting silane coupling agent having organic and inorganic functional groups in the molecule plays an important role.

The fast-hardening silane coupling agent is preferably 3-Mercaptopropyltrimethoxysilane, 3-Mercaptopropylmethyldimethoxysilane, 3-Mercaptomethyltrimethoxysilane, 3-Mercaptopropyltriethoxysilane, 3-Mercaptopropylmethyldiethoxysilane, 3-Mercaptomethyltriethoxysilane having an -SH group and N-Phencaptomethyltriethoxysilane having an amine group, N-Phenyltrimethoxysilane, γ-aminopropyltrimethoxysilane At least one selected from the group consisting of [3-(triethoxysilyl)propyl]amine, γ-aminopropylmethyldiethoxysilane, aminopropylmethyldimethoxysilane, aminopropylmethyldiemethoxysilane, aminopropyltrimethoxysilane, aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, and mixtures thereof is preferable.

The fast-setting silane coupling agent is hydrolyzed and used, and in order to shorten the hydrolysis time and impart compatibility to the modified aliphatic amine-based curing agent used for curing the epoxy, it is preferable to proceed in an alkaline atmosphere in the range of pH 12 to 13. good. Preferably, at least one selected from the group consisting of aqueous ammonia, monoethanolamine, diethanolamine, triethanolamine, ethanol, and mixtures thereof may be used.

More specifically, put into a reactor at room temperature, add 5 to 20 parts by weight of ethanol to 5 to 20 parts by weight of a fast-hardening silane coupling agent, stir at 50 rpm or more to uniformly mix, and adjust the stirring speed to 200 rpm or more to add aqueous ammonia and triethanol Prepare a partial hydrolyzate of a fast-hardening silane coupling agent obtained by partial hydrolysis by adding 0.1 to 5 parts by weight of an amine to adjusting the pH to 12 to 13, stirring for 30 minutes or more.

On the other hand, put 100 parts by weight of the inorganic filler in a ribbon mixer, spray 5 to 50 parts by weight of the partial hydrolyzate of the silane coupling agent prepared above, wet the surface, and mix continuously for 2 hours at room temperature to form an inorganic filler modified with a fast-hardening silane coupling agent. manufacture

In the curing agent, the content of the inorganic filler modified with the fast-setting silane coupling agent prepared as described above is included in 3 to 18% by weight, and when the content of the inorganic filler modified with the fast-setting silane coupling agent is higher than 18% by weight, the viscosity is It increases, which adversely affects the uniform mixing and permeability, and increases the cost, thereby lowering the economic feasibility. If the content of the inorganic filler modified with the fast-hardening silane coupling agent is lower than 3 wt%, it is not preferable because of the effect of shortening the curing time and the increase in curing shrinkage and elongation at tensile failure. More preferably, it is 5 to 15% by weight.

In the curing agent, the dispersant is an auxiliary material added for uniform dispersion of the inorganic filler modified with the fast-hardening silane coupling agent, and the content thereof is preferably 0.1 to 2 wt%. When the content of the dispersant is higher than 2% by weight, the dispersing effect does not increase any more, and when it is lower than 0.1% by weight, the dispersing effect is insufficient and the curing agent becomes non-uniform.

Specific examples of such dispersants include BYK-P104(S), BYK-P105, Anti-terra-203, Anti-terra-204, and the like.

On the other hand, the mixing ratio of the main agent and the curing agent is 1: 0.3 to 0.6 by weight to provide a room temperature fast-setting epoxy cracking injection composition comprising an inorganic filler modified with a fast-setting silane coupling agent, characterized in that it is.

According to the room temperature fast-diameter type epoxy-based cracking injection composition according to the present invention as described above, the epoxy cracking injection agent has excellent permeability by improving wettability, and by improving it into a fast-diameter type, the curing time is 40±10 minutes, and the strength is increased early. It is a room temperature fast-diameter type epoxy cracking injection composition having high adhesive strength and tensile strength and low curing shrinkage and elongation while exhibiting properties. Concrete used in the manufacture of expansion joints of concrete roads, bridges, and bridge bearings. Indirect costs can be reduced by quickly repairing cracks in concrete structures with frequent vehicular traffic such as tunnels and reducing traffic congestion by opening traffic early.

A preferred embodiment according to the present invention will be described in detail. However, the following examples are provided so that those of ordinary skill in the art can fully understand the present invention, and can be modified in various other forms, and the scope of the present invention is limited to the examples described below it's not going to be

Hereinafter, examples of a room temperature fast-diameter epoxy cracking injection composition comprising an inorganic filler modified with a fast-diameter silane coupling agent according to the present invention are presented in more detail, and the present invention is It is not limited.

[Production of subject]

Carboxylic Terminated Butadiene Acrylonitrile (CTBN)-modified epoxy resin (KR-207, Kukdo Chemical) as a rubber-modified epoxy resin by putting bisphenol A epoxy resin (YD-128, Kukdo Chemical) in a mechanical mixer at room temperature and stirring the stirring speed at 200 rpm or higher. ), Glycidoxypropyl trimethoxysilane (GPTMS), and a surface tension reducing agent (BYK-320) were sequentially added and stirred for 30 minutes to make it uniform, and the stirring speed was adjusted to 50 rpm or less, and an antifoaming agent (BYK-088) was added and stirred for 30 minutes. was prepared.

[Preparation of curing agent]

<Step 1: Partial hydrolysis of fast-hardening silane coupling agent>

Preparation of the inorganic filler modified with the fast-hardening silane coupling agent at room temperature was uniformly mixed by stirring 20 parts by weight of ethanol to 20 parts by weight of 3-Mercaptopropyltriethoxysilane of the fast-hardening silane coupling agent at 50 rpm or more. 3-Mercaptopropyltriethoxysilane was partially hydrolyzed by adding 2 parts by weight of distilled water whose pH was adjusted to 12.5 by adding triethanolamine to the distilled water by adjusting the stirring speed to 200 rpm or more and stirring for 30 minutes or more.

<Step 2: Modification of inorganic filler with fast-hardening silane coupling agent>

Put 100 parts by weight of calcium carbonate as an inorganic filler in a ribbon mixer, mix at 100 rpm, and spray 20 parts by weight of 3-Mercaptopropyltriethoxysilane prepared by partial hydrolysis in <Step 1> to wet the surface, and then mix continuously for 2 hours at room temperature for quick setting An inorganic filler modified with a silane coupling agent was prepared.

<Step 3: Preparation of curing agent including inorganic filler modified with fast-setting silane coupling agent>

At room temperature, put a modified aliphatic amine curing agent (KH-500F), Kukdo Chemical) into a mechanical stirrer, and while stirring at 200 rpm, the inorganic filler and dispersant modified with the fast-hardening silane coupling agent prepared in <Step 2> are sequentially added and mixed for 30 minutes. Thus, a curing agent including an inorganic filler modified with a fast-setting silane coupling agent was prepared.

A room temperature fast-setting epoxy cracking injection composition was prepared according to [Examples 1 to 5] and [Comparative Examples 1 to 2] described in [Table 1] with the prepared base material and curing agent.

The composition of [Examples 1 to 5] and [Comparative Examples 1 to 2] prepared above was tested for pot life according to ASTM C 2474 and viscosity, adhesive strength, curing shrinkage, heating change, tensile strength, and tensile strength according to KS F 4923. The elongation at break test was compared with that of S company, and the results are shown in [Table 2].

As shown in [Table 2], Examples 1 to 5 using the room temperature fast-diameter epoxy cracking injection composition containing the inorganic filler modified with the fast-diameter silang coupling agent according to the present invention is a target curing time of 40 It was suitable for ±10 minutes, and the adhesive strength, curing shrinkage, tensile strength and elongation at tensile failure showed improved effects than the standard values of KS F 4923.

On the other hand, Comparative Examples 1 to 2 were not suitable for the target curing time of 40±10 minutes, and the adhesive strength, curing shrinkage, tensile strength, and elongation at tensile failure did not reach the standard values of KS F 4923.

Therefore, it can be confirmed that the performance of the room temperature fast-setting epoxy crack injection agent, such as the curing time accelerating effect and strength, is greatly improved by the incorporation of the inorganic filler modified with the fast-setting silane coupling agent.

On the other hand, in [Table 2], it was confirmed that the domestic S company product did not reach the curing time of 40±10 minutes, which is the target of the present invention, even though it is a fast-diameter product.

As described above, those skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, it should be understood that all of the embodiments described above are illustrative and not restrictive. The scope of the present invention should be construed as being included in the scope of the present invention, rather than the above detailed description, all changes or modifications derived from the meaning and scope of the claims and equivalent concepts to be described later.

Claims (5)

75-93 wt% of bisphenol A epoxy resin, 5-20 wt% of Carboxylic Terminated Butadiene Acrylonitrile (CTBN) epoxy resin, 0.5-5 wt% of Glycidoxypropyl trimethoxysilane (GPTMS), 0.1-2 wt% of a surface tension reducing agent , a subject comprising 0.1 to 2% by weight of an antifoaming agent;
80 to 95% by weight of the modified aliphatic amine curing agent and 1 to 20 parts by weight of an alcohol-based solvent to 1 to 20 parts by weight of a fast-hardening silane coupling agent are stirred at 50 rpm or more to uniformly mix, and the stirring speed is adjusted to 200 rpm or more. 1 to 30 parts by weight of a partial hydrolyzate of a fast-diameter silane coupling agent obtained by partial hydrolysis by adding 0.1 to 5 parts by weight of distilled water whose pH is adjusted to 10 to 12 with ammonia water, stirring for 30 minutes or more, and carbonic acid having a particle size in the range of 0.1 to 3 μm By spraying 100 parts by weight of any one or more inorganic fillers selected from the group consisting of calcium, silica sand, and silica fume to wet the surface and mixing continuously for 2 hours at room temperature, a fast-diameter silane coupling agent partial hydrolyzate surface-modified inorganic filler 3 to 18% by weight and a curing agent comprising 0.1 to 2% by weight of a dispersant; Room temperature fast-setting epoxy cracking injection composition comprising an inorganic filler modified with a fast-setting silane coupling agent, characterized in that it consists of
The method according to claim 1,
The mixing ratio of the main agent and the curing agent is 1: 0.3-0.6 by weight. Room temperature fast-setting epoxy cracking injection composition comprising an inorganic filler modified with a fast-setting silane coupling agent, characterized in that it is
delete The method according to claim 1,
The fast-diameter silane coupling agent is 3-Mercaptopropyltrimethoxysilane, 3-Mercaptopropylmethyldimethoxysilane, 3-Mercaptomethyltrimethoxysilane, 3-Mercaptopropyltriethoxysilane, 3-Mercaptopropylmethyldiethoxysilane, 3-Mercaptomethyltriethoxysilane and N-Phenyl-γ-aminopropyltrimethoxysilyl having an amine group, [3-(triethoxysilyl)propyl] A room temperature fast-setting epoxy containing an inorganic filler modified with a fast-hardening silane coupling agent, characterized in that one or more selected from amine, γ-aminopropylmethyldiethoxysilane, aminopropylmethyldimethoxysilane, aminopropylmethyldiemethoxysilane, aminopropyltrimethoxysilane, aminopropyltrimethoxysilane, and 3-aminopropyltriethoxysilane are mixed. Crack injection composition
delete