KR102689938B1 - Eco-friendly construction method of waterproof and reinforcement of structures using earthquake resistant and frame retardant polyurea coating material containing starfish calcium hydroxide nano extract and fluorinated graphene fibers - Google Patents

Abstract

The present invention relates to an eco-friendly waterproofing reinforcement construction method for structures using an earthquake-resistant flame-retardant polyurea paint containing starfish calcium hydroxide nano extract and fluorinated graphene fibers. In particular, cracks in structures such as concrete and steel are completely cleaned with a specialized dehumidifying device. After removing the moisture, repair is performed with a crack injection agent, followed by primer and intermediate coating using polyurea paint containing starfish calcium hydroxide nano extract and fluorinated graphene fiber using bot coating and spray painting methods, followed by urethane with heat-insulating properties. By applying a top coat using paint, water resistance, moisture resistance, abrasion resistance, weather resistance, rust prevention, salt water resistance, chemical resistance, gloss, and durability are improved, and the surface reinforcement effect of the structure is maintained for a long period of time, extending the lifespan and seismic performance. and a new waterproofing coating reinforcement method that has the effect of protecting structures by improving fire resistance performance.

Description

{Eco-friendly construction method of waterproof and reinforcement of structures using earthquake resistant and frame retardant polyurea coating material containing starfish calcium hydroxide nano extract and fluorinated graphene fibers}

The present invention relates to an eco-friendly waterproofing reinforcement construction method for structures using an earthquake-resistant flame-retardant polyurea paint containing starfish calcium hydroxide nano extract and fluorinated graphene fibers. In particular, cracks in structures such as concrete and steel are completely cleaned with a specialized dehumidifying device. After removing the moisture, repair is performed with a crack injection agent, followed by primer and intermediate coating using polyurea paint containing starfish calcium hydroxide nano extract and fluorinated graphene fiber using bot coating and spray painting methods, followed by urethane with heat-insulating properties. By applying a top coat using paint, water resistance, moisture resistance, abrasion resistance, weather resistance, rust prevention, salt water resistance, chemical resistance, gloss, and durability are improved, and the surface reinforcement effect of the structure is maintained for a long period of time, extending the lifespan and seismic performance. and a new waterproofing coating reinforcement method that has the effect of protecting structures by improving fire resistance performance.

In general, building structures, especially those made of concrete and structures made of steel, repeat expansion and contraction around the center according to temperature changes due to the structure's inherent thermal expansion coefficient, which causes cracks to occur and allow water, rain, etc. to enter the structure. easy to penetrate.

In addition, the reality is that it is difficult to guarantee the safety of concrete and steel structures such as apartments, buildings, schools, and bridges due to the high possibility of structural deformation and cracking due to rapid climate change and earthquakes.

Recently, science has developed many new materials along with the development of artificial intelligence (AI), but there are few cases of them being improved and applied in the right way for on-site construction. In addition, construction methods are also lacking in improving the durability of structures. It's reality.

Previously, various waterproofing construction methods using various waterproofing materials have been used to prevent internal inflow of water due to cracks in the structure.

There is a method of waterproofing such structures by applying asphalt, coal tar pitch, etc. to form a waterproof layer. This has the advantage of being easy to construct and low cost, but cracks occur in the structure and water penetrates into the cracked areas, making waterproofing impossible. There is a problem that it is easy to lose effectiveness.

Another waterproofing construction method is a two-component product using a urethane or epoxy waterproofing agent. The two-component product uses a reaction when mixing the base material and the hardener, which can lead to mixing defects. It is easy, but there is a problem that uncured defects may occur depending on working conditions.

As a way to improve this problem, a waterproofing construction method using a two-component polyurea paint roll has recently been proposed. Such polyurea has excellent tensile performance and elongation, excellent chemical resistance, and durability, so it is widely used in building roofs, interior and exterior walls, water tanks, swimming pools, parking lots, etc., and its scope of use is expanding not only in the construction field but also in the ship field. .

However, the conventional waterproofing construction method using polyurea paint is carried out in the order of primer, base coat, and polyurea paint application, increasing the construction cost. However, since construction is performed without dehumidification and injection repair of cracked areas, the durability of the structure is shortened. There is a problem that is difficult to increase.

In addition, the existing waterproofing construction method using polyurea paint is vulnerable to fire, so it is not a method to prevent casualties in the event of a fire, and in particular, it is not a method for preparing for earthquakes, which are of increasing concern recently.

As an example of a waterproofing construction method using polyurea paint, Republic of Korea Patent No. 10-1110575 introduces an epoxy prepolymer into the polymer molecule to improve the strength and toughness of the final polyurea, which can lead to differentiation and optimization of physical properties. We suggest existing technologies.

In addition, Republic of Korea Patent No. 10-1307351 discloses a construction method that can improve the surface smoothness of the coating film by delaying the curing time of the polyurea paint composition to secure the fluidity of the resin and facilitating the movement of the polymer chain to increase chemical bonding force. I suggest.

In addition, Republic of Korea Patent No. 10-1955675 states that in forming a two-component polyurea paint, physical properties can be improved and a dense structure is achieved by including an epoxy adduct amine polyol having a network structure with a high degree of cross-linking along with a polyamine mixture in the curing agent. Therefore, we propose a construction method that can improve watertightness and corrosion resistance.

In addition, Republic of Korea Patent No. 10-1197197 introduces an amine-terminated epoxy prepolymer into the polyurea molecular structure and includes an inorganic filler, thereby improving chemical properties such as corrosion resistance, rust prevention, chemical resistance, and chemical resistance, as well as toughness and abrasion resistance. We propose a construction method that can improve physical properties.

However, the above-mentioned waterproofing construction methods using conventional polyurea paints are performed without dehumidification and injection repair of cracked areas, so it is difficult to significantly increase the durability of the structure, and they are not sufficient in terms of fire resistance and earthquake resistance. There were limitations in providing an improved method.

The present invention was developed in consideration of the situation of the prior art as described above, and has excellent protection functions for structures such as concrete and steel, as well as excellent adhesion and durability to the surface to be coated, and in particular, excellent chemical and physical properties at the same time. In addition, we aim to provide a new eco-friendly waterproofing method that can dramatically increase the durability of the structure by improving crack resistance and also improve resistance to fire and earthquakes.

In order to achieve the above task, the present invention

(a) preparing the surface of the structure to be coated using a surface treatment device;

(b) dehumidifying welding defects and cracks in the organized structure and performing repair welding and injection repair;

(c) A two-component polyurea paint containing starfish calcium hydroxide nano extract and fluorinated graphene fibers on the surface of the above-organized structure, and consisting of a base material containing a urethane prepolymer obtained by the reaction of isocyanate and polyol and a curing agent containing polyamine. A step of applying a primer using a brush coating method;

(d) A two-component polyurea paint containing Kasari calcium hydroxide nano extract and fluorinated graphene fibers on the brush-painted surface, and consisting of a base material containing a urethane prepolymer obtained by the reaction of isocyanate and polyol, and a curing agent containing polyamine. Applying a primer using a spray coating method;

(e) applying an interior finishing paint to the surface using a brush coating method using a paint containing starfish calcium hydroxide nano extract and fluorinated graphene fibers in the two-component polyurea paint and adding a curing retardant; and

(f) applying an interior finishing paint to the surface using a paint containing starfish calcium hydroxide nano extract and fluorinated graphene fibers on the two-component polyurea paint using a spray coating method; a structure using a polyurea paint including Provides an eco-friendly waterproofing reinforcement construction method.

In one embodiment of the present invention, the starfish calcium hydroxide nano-extract is obtained by sequentially immersing the starfish shell with the internal organs removed in acid and alcohol and heating it while immersed in water, and filtering and drying the obtained extract. It is characterized by

Additionally, in one embodiment of the present invention, the fluorinated graphene fiber is characterized by using graphene oxide fiber surface-modified by fluorine.

In addition, in one embodiment of the present invention, in (e), the curing retardant is characterized in that polyaliphatic ester with a weight average molecular weight of 10,000 to 100,000 is used.

Additionally, in one embodiment of the present invention, after step (f),

(g) applying an external finishing paint to the surface using a brush coating method using a heat-insulating urethane paint containing heat-insulating powder; and

(h) applying an external finishing paint to the surface using a spray coating method using a heat-insulating urethane paint containing heat-insulating powder.

In addition, in one embodiment of the present invention, the heat-insulating urethane paint is characterized in that it further includes silane, wax, bentonite, a reaction accelerator, a dispersant, calcium carbonate, and a pigment.

The characteristics and advantages of the eco-friendly waterproofing method for structures using polyurea paint according to the present invention are explained as follows.

First of all, since polyurea-based paint is used, it has excellent waterproofing effect, and the polyurea-based paint is composed of a two-component type with a main part and a hardener part, and the room temperature pot life is secured by adjusting the number of moles of the isocyanate group in the main part and the amine group in the hardener part to the optimal ratio. At the same time, workability is good and drying time can be carried out in the shortest possible time, which has the effect of shortening the construction period.

In addition, the waterproofing construction method using polyurea paint according to the present invention can reduce construction time and minimize the increase in construction cost by performing base, middle and top coats without the primer construction step, and provides specialized dehumidification for cracked areas of the structure. By completely removing moisture using a device and then applying a urea injection agent, the durability of the structure can be dramatically increased and the lifespan of the structure can be significantly increased.

In addition, due to the nature of polyurea, brush painting is difficult, so by adding a curing retardant to the paint to create a polyurea paint for corners, corners, and areas that are difficult to paint, there is an effect of protecting vulnerable areas.

In addition, by applying polyurea paint containing starfish calcium hydroxide nano extract and fluorinated graphene synthetic fiber, earthquake resistance and flame retardancy can be improved, and emergency escape time can be secured in the event of a fire in the structure, minimizing human damage. It is possible to prepare for earthquakes that may occur at any time, which has the effect of significantly reducing earthquake damage.

Hereinafter, the present invention will be described in more detail.

The eco-friendly waterproofing method for structures using polyurea paint according to the present invention is carried out in the following order. in other words,

(a) preparing the surface of the structure to be coated using a surface treatment device;

(b) dehumidifying welding defects and cracks in the organized structure and performing repair welding and injection repair;

(c) A two-component polyurea paint containing starfish calcium hydroxide nano extract and fluorinated graphene fibers on the surface of the above-organized structure, and consisting of a base material containing a urethane prepolymer obtained by the reaction of isocyanate and polyol and a curing agent containing polyamine. A step of applying a primer using a brush coating method;

(d) A two-component polyurea paint containing Kasari calcium hydroxide nano extract and fluorinated graphene fibers on the brush-painted surface, and consisting of a base material containing a urethane prepolymer obtained by the reaction of isocyanate and polyol, and a curing agent containing polyamine. Applying a primer using a spray coating method;

(e) applying an interior finishing paint to the surface using a brush coating method using a paint containing starfish calcium hydroxide nano extract and fluorinated graphene fibers in the two-component polyurea paint and adding a curing retardant; and

(f) applying an interior finishing paint to the surface using a paint containing starfish calcium hydroxide nano extract and fluorinated graphene fibers on the two-component polyurea paint using a spray coating method.

Hereinafter, the eco-friendly waterproofing reinforcement construction method of a structure using the polyurea paint according to the present invention will be described in detail in each step. Hereinafter, the construction method for constructing a concrete structure will be mainly described. However, the present invention is not limited to concrete structures and can also be applied to other structures such as steel structures.

1. Floor cleaning steps

This is to remove laitance and foreign substances from the surface of the target structure (e.g., concrete structure). Typically, a process such as sandpaper polishing or grinding is performed, and a high-pressure water sprayer is used to remove laitance and foreign substances from the surface of the structure (e.g., a floor or wall). This is the step of removing dust and dirt.

In this stage, the base agent (primer agent) is not applied for external waterproofing and surface strengthening protection of the structure, but base preparation and block adjustment using the base agent can be additionally performed in some cases or as needed. there is. The application of this base agent is a process of treating uneven parts of the surface of the structure before painting. The base agent treatment is cured for 1 to 2 days to minimize harmful effects such as temperature, load, impact, or damage. desirable.

2. Dehumidification treatment and injection repair steps

After the surface preparation is completed, moisture is completely removed using a specialized dehumidifying device.

In addition, repair welding is performed on the welded joints and cracked areas of the structure, and repair work is performed in advance using an injection agent.

In the present invention, the injection may be a urea injection, but it is not limited thereto, and various types of maintenance injections used in the field to which the present invention pertains may be used without limitation.

By repairing defective areas inside the structure through such dehumidification treatment and repair welding, it is effective to prevent defects from developing internally even after applying a base coat using urea paint, a middle coat, and a top coat using a heat-insulating urethane paint. .

3. Polyurea paint base coat

Next, the surface of the organized structure is coated with a polyurea paint, first by brush painting and then by spray painting.

At this time, the polyurea paint used in the undercoating is a two-component poly containing starfish calcium hydroxide nano extract and fluorinated graphene fiber, a base material containing a urethane prepolymer obtained by the reaction of isocyanate and polyol, and a curing agent containing polyamine. It is characterized by using urea paint.

In the present invention, the polyurea paint is composed of a two-component type of a base material consisting of a urethane prepolymer resin component and a curing agent containing polyamine, and is used by mixing immediately before painting.

First, the subject may include an isocyanate group-terminated prepolymer, and specifically, may include an isocyanate group-terminated prepolymer prepared from aliphatic diisocyanate, aromatic diisocyanate, polyetheramine, etc.

In this way, by using aromatic diisocyanate instead of only aliphatic diisocyanate as diisocyanate, a polyurea paint with excellent tensile strength and adhesion can be obtained while reducing yellowing.

To achieve this, it is desirable to appropriately adjust the ratio of each component. If too much aromatic diisocyanate is added, the effect of reducing the yellowing phenomenon may be minimal, and if too much aliphatic diisocyanate is added, the yellowing phenomenon is reduced, but the tensile strength is reduced. Strength and adhesion may decrease.

In the present invention, the aliphatic diisocyanate may be any one or more selected from the group consisting of tetramethylene diisocyanate, pentamethylene diisocyanate, and hexamethylene diisocyanate, and the aromatic diisocyanate may be toluene diisocyanate and diphenylmethane. Any one or more selected from the group consisting of diisocyanates may be used. By using these as diisocyanate compounds, adhesion to the substrate after construction can be improved.

In addition, the curing agent is a compound containing an amine group at the terminal, and for example, a polyamine mixture containing polyetheramine and polyasparticamine may be used.

In addition, it is preferable that the starfish calcium hydroxide nano extract and fluorinated graphene fiber are included in the curing agent. Due to the above ingredients, high waterproof properties, earthquake resistance properties, and fire resistance properties can be obtained. This will be described later.

In the present invention, the curing agent may be mixed in an amount of 50 to 200 parts by weight, more preferably 70 to 180 parts by weight, based on 100 parts by weight of the base material. The mixing ratio can be adjusted depending on the content of reactive groups (isocyanate group, amine group, etc.) contained in the main agent and curing agent.

In the present invention, when applying the undercoat, the first undercoat is applied by brush painting and the second undercoat is applied by spray painting, so that areas where spray painting is difficult, such as corners, floor and wall boundaries, joint areas, etc. are pre-painted and then cured at an initial speed. Painting can be done by spraying.

Hereinafter, the starfish calcium hydroxide nano extract and fluorinated graphene fiber included in the present invention will be described.

First, in the present invention, the starfish calcium hydroxide nano extract is a nano-sized starfish calcium hydroxide extract that provides heat resistance or flame retardant performance to improve fire resistance, and at the same time serves to improve earthquake resistance.

Starfish are echinoderms that live on the seafloor. They have excellent reproductive potential and have no natural enemies in the marine ecosystem, so they are not easy to get rid of. Our government has been carrying out a starfish collection campaign since early 2000, and the annual collection cost is over 2 billion won.

Some of the starfish collected in this way are used for cosmetic purposes, but a large amount is simply left unattended, so research is needed on ways to utilize them as a resource.

The present invention proposes a method of using large amounts of starfish collected from the ocean as civil engineering and construction materials.

In the present invention, the nanoscale starfish calcium hydroxide extract is characterized in that it is obtained by sequentially immersing starfish shells with internal organs removed in acid and alcohol and heating them while immersed in water to obtain an extract, and filtering and drying the obtained extract.

Specifically, the starfish shell (shell) from which the internal organs have been removed is first immersed in an acid solution and then in an alcohol solution to remove toxins. At this time, it is desirable to cut the starfish shell into an appropriate size and use it, the acid concentration is preferably about 10 to 20% by weight, and the immersion time is about 4 to 10 hours.

Additionally, methanol or ethanol can be used as the alcohol, and the immersion time is preferably 1 to 5 hours.

Once the immersion of the starfish shell is completed, it is then heated while immersed in water.

When the shell of a starfish is heated, decomposition products begin to separate, and when the concentration exceeds a certain level, they settle to the bottom.

This sediment contains a large amount of calcium hydroxide, approximately 20 to 40% by weight, and is a bio extract extracted from starfish.

The starfish potassium hydroxide nano extract is washed, filtered, and dried to obtain a powder, which can be used in the polyurea paint according to the present invention.

The polyurea paint using the starfish potassium hydroxide nano extract according to the present invention has excellent flame retardancy and fire resistance, and is also effective in increasing water resistance and chemical resistance.

The starfish potassium hydroxide nano extract may be added in an amount of 0.5 to 10 parts by weight, more preferably 1.0 to 7 parts by weight, based on 100 parts by weight of the amine component in the curing agent. When contained within the above range, earthquake-resistant, flame-retardant and earthquake-resistant performance can be effectively demonstrated.

Next, the fluorinated graphene fiber is an oxidized graphene fiber whose surface has been modified by fluorine, and functions to improve the waterproofing, fire resistance, and heat resistance of polyurea paint.

Specifically, the graphene oxide fiber surface-modified by fluorine induces covalent bonds between graphene oxide and polyurea, so that the graphene in the coating film is uniformly dispersed and cracked, thereby demonstrating excellent waterproof, heat-resistant, and fire-resistant properties. .

The graphene oxide may be single-layer graphene oxide or graphite in which several to tens of layers of graphene oxide are stacked, and such graphene oxide may be manufactured through a process of exfoliating graphite using a strong acid and an oxidizing agent. The manufacturing cost of graphene oxide can be reduced compared to graphene or reduced graphene oxide, and oxygen functional groups such as hydroxyl groups are formed in graphene oxide during the peeling process, making it easy to modify the surface with fluorinated substances in the future, and within the curing agent. It has the advantage of being uniformly dispersed.

The graphene oxide surface-modified with fluorine may be added in an amount of 0.1 to 5 parts by weight, more preferably 0.3 to 4 parts by weight, based on 100 parts by weight of the amine component in the curing agent. When contained within the above range, waterproofing and heat resistance can be effectively demonstrated.

Ceramic pigment may be additionally mixed with the polyurea paint for undercoating according to the present invention to prevent internal corrosion caused by intrusion of acidic corrosion particles.

In the present invention, the ceramic pigment is a mixture of 5 to 40% by weight of mica with a particle size of 1 to 100㎛, 10 to 50% by weight of stone dust, 5 to 50% by weight of emulsion, 10 to 70% by weight of water, and 1 to 10% by weight of pigment. It can be manufactured and used in the range of 0.1 to 5 parts by weight based on 100 parts by weight of the main ingredient.

In the present invention, the mica can be used in the form of flakes or powder, and when mica having the above particle size is used, adhesion to the subject can be improved.

Additionally, in the present invention, the stone powder can be used as a commonly used stone powder, or it can be used by pulverizing natural stones or artificial stones. The stone powder can be used having the same particle size as mica, and this serves to improve adhesion to the subject.

In the present invention, ammonia or amine can be used as the emulsion, and less toxic emulsion paint, water-soluble paint, etc. can also be used.

Additionally, in addition to mixing pigments as a method to impart color, the mica surface may be coated in advance with a pigment. Specifically, color can be imparted by mixing and kneading pigments such as inorganic pigments and organic pigments with mica to coat the surface of the mica with the pigment, and then baking or hardening the pigment-coated mica and cooling it.

Additionally, in the present invention, a soft resin may be additionally included to prevent separation of the coated surface from the painted surface over a long period of time. Soft resin can further improve adhesion by increasing the flexibility of the painted surface. The soft resin used at this time can be acrylic resin, methacrylic resin, urethane resin, phenoxy resin, styrene resin, natural rubber, SBR, NBR, etc., and the amount used is 0.01 to 1.0 weight based on 100 parts by weight of the main ingredient. It is desirable to include it as a part.

In addition, various additives may be included within the range that do not impair the effect of the present invention, and the additives may further include additives such as dispersants, thickeners, anti-foaming agents, pigments, pH adjusters, anti-freezing agents, preservatives, and antioxidants. Such additives are preferably included in the range of 0.1 to 5 parts by weight based on 100 parts by weight of the main component.

5. Middle coat of polyurea paint (finish painting of internal structure)

Next, an intermediate coating is applied to the surface of the base-coated structure using the two-component polyurea paint (internal finishing paint) according to the present invention, first by brush painting and then by spray painting.

Brush painting is performed using a brush painting method using a paint containing starfish calcium hydroxide nano extract and fluorinated graphene fiber and adding a curing retardant to the two-component polyurea paint.

In the present invention, the curing retardant plays a role in improving the surface smoothness of the coating film by securing the fluidity of the resin by delaying the curing time and facilitating the movement of the polymer chain to increase the chemical bonding force. In the present invention, the curing retardant is weight average. Polyaliphatic esters with a molecular weight of 10,000 to 100,000 can be used.

The curing retardant has a large branched chain with a three-dimensional structure and plays a role in delaying the reaction time with the base material and curing agent by widening the distance between molecules, thereby increasing fluidity and allowing post-curing to occur, resulting in non-curing. Problems such as peeling of the coating film, peeling off the coating film, defective coating film surface, resin crowding, and uneven resin coating thickness can be solved.

In the present invention, the curing retardant may be added in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of the amine component in the curing agent.

In the present invention, when applying the intermediate coating, the first intermediate coating is done by brush painting and the second intermediate coating is done by spray painting, so that areas where spray painting is difficult, such as corners, floor and wall boundaries, joint areas, etc., are pre-coated and then cured at an initial speed. Painting can be done by spraying. Accordingly, the interior finish painting can be carried out precisely without missing parts, thereby achieving a complete waterproof protection effect.

5. Apply top coat (finishing external structure)

In the case of surface waterproofing construction of an internal structure, the finishing process can be completed through processes 1 to 4 above, but in the case of an external structure exposed to the sun and outdoor air, the following steps are additionally included. That is, in the case of external structures, following step (f) above,

(g) applying an external finishing paint to the surface using a brush coating method using a heat-insulating urethane paint containing heat-shielding powder; and

(h) applying an external finishing paint to the surface using a spray coating method using a heat-insulating urethane paint containing heat-insulating powder.

That is, after the polyurea intermediate coating applied in step (f) is cured and cured, the top coating is applied to the surface to which the intermediate coating was applied.

In the present invention, a solvent-free two-component urethane paint is used as the top coat paint.

In the present invention, the solvent-free two-component urethane paint is characterized in that it is composed of an acrylic urethane resin as a base resin and includes silane, wax, bentonite, urethane accelerator, dispersant, calcium carbonate, and pigment.

In the present invention, the acrylic urethane resin that forms the solvent-free two-component urethane paint is obtained by mixing and reacting in the presence of a solvent (xylene or aliphatic type) using acrylic polyol as the main resin and isocyanate as the curing agent resin.

At this time, it is preferable to use the acrylic polyol having a solid content of 80% by weight or more, and more specifically, it is preferable to use 80 to 90% by weight.

Using acrylic polyol with high solid content has the effect of improving physical properties such as durability and wear resistance.

In the present invention, the solvent-free two-component urethane paint consists of 20 to 40 parts by weight of acrylic urethane resin, 15 to 30 parts by weight of silane, 1 to 10 parts by weight of wax, 1 to 10 parts by weight of bentonite, 0.1 to 5 parts by weight of urethane accelerator, and 0.5 to 0.5 parts by weight of dispersant. It may include 5 parts by weight, 1 to 20 parts by weight of calcium carbonate, and 0.1 to 10 parts by weight of pigment.

The acrylic urethane resin is 2-hydroxyethyl methacrylate (2-HEMA), methyl methacrylate (MMA), and n-butyl acrylate (n-BA). A polyurethane acrylate hybrid emulsion synthesized by adding an acrylate monomer selected from acrylic acid (AAc), an anionic or nonionic emulsifier, and an initiator can be used.

The acrylic urethane resin dries quickly, exhibits excellent weather resistance, durability, and ultraviolet ray stability even under external exposure conditions, and is water-soluble, making it environmentally friendly.

The silane is used to improve the adhesion of the paint and improve the water resistance and durability of the paint film, and includes glycidoxy propyl methyldiethoxy silane and gamma-methacryloxy propyl triethoxysilane. triethoxy silane), gamma-Glycidoxypropyl trimethoxy silane, gamma-Amino propyl triethoxy silane, or vinyltrimethoxy silane. can be used.

The wax serves to strengthen and maintain gloss along with the characteristics of the resin itself.

The bentonite serves to prevent precipitation of constituents and improve workability.

The urethane accelerator serves to promote the reaction between acrylic polyol and isocyanate and improve the physical properties of the resulting acrylic urethane resin.

The dispersant is used to form a uniformly colored coating film by evenly dispersing the coloring pigment in the liquid phase when mixing acrylic urethane paint. In the present invention, a nonionic type polyoxyalkylene type surfactant or anionic type polycarboxylic salt type is used. Any one selected from surfactants can be used.

In the present invention, the calcium carbonate serves to strengthen the physical strength of the paint and improve durability and scratch resistance.

In addition, in the present invention, an extender pigment can be used as the pigment. The extender pigment is used to express the color of acrylic urethane paint, and any one selected from red iron oxide, titanium dioxide, yellow iron oxide, and carbon black can be used.

In addition to the above components, the top coat may further include additives such as thickeners, antifoaming agents, and co-solvents.

The co-solvent is used to increase the solubility of the solvent to facilitate the film shape, and includes Texanol (2,2,4-trimethyl-1,3-pentanediolmonoisobutyrate), butyl acetate (N-Butyl Acetate), and Butyl Cellusolve (2-Butoxyethanol). ) can be used.

In the present invention, the solvent-free two-component urethane paint can be used to exhibit heat-insulating performance by using one containing heat-insulating powder.

In the present invention, the heat shield powder effectively reflects infrared rays that generate heat energy from sunlight and serves to suppress the conversion of infrared rays into thermal energy.

In the present invention, the heat shield powder may be, for example, one or more metal oxides selected from the group consisting of antimony tin oxide, indium tin oxide, cesium tungsten oxide, and antimony trioxide-zinc oxide.

The heat-insulating powder may be in the form of particles such as spherical, rod-shaped, needle-shaped, or hollow, and is preferably used with an average particle size of 2 to 100 nm.

In the present invention, the heat-insulating powder is preferably contained in the range of 0.1 to 5 parts by weight in the solvent-free two-component urethane paint.

In the present invention, when applying the external finish of the top coat, the first top coat is painted with a brush paint and the second top coat is applied with spray paint, so that parts that are difficult to spray paint, such as corners, floor and wall boundaries, joint parts, etc. are pre-painted, and then Painting can be done by spraying using the initial speed curing method. Accordingly, the exterior finish painting can be carried out precisely without missing any parts, thereby achieving a complete waterproof protection effect.

The surface waterproofing coating of the structure constructed by the above method uses the above-described eco-friendly polyurea paint, which has excellent bonding power and durability with the surface of the structure being coated, and is especially excellent in properties such as chemical resistance, water resistance, salt damage resistance, and heat resistance. Therefore, the surface protection effect of the structure is excellent.

In addition, it has excellent waterproofing effect, and the polyurea-based paint is composed of a two-component type of main part and hardener part, and by adjusting the number of moles of isocyanate group in the main part and amine group in the hardener part to the optimal ratio, room temperature pot life is secured, and workability is good while drying time is shortened. Since it can be carried out in the shortest time, it has the effect of shortening the construction period.

In addition, by performing base, middle and top coats without the primer construction step, construction time can be reduced and the increase in construction costs can be minimized. After completely removing moisture from cracked areas of the structure using a specialized dehumidifying device, urea injection is added. By pre-construction, the durability of the structure can be dramatically increased and the lifespan of the structure can be significantly increased.

In addition, due to the nature of polyurea, brush painting is difficult, so by adding a curing retardant to the paint to create a polyurea paint for corners, corners, and areas that are difficult to paint, there is an effect of protecting vulnerable areas.

In addition, by applying polyurea paint containing starfish calcium hydroxide nano extract and fluorinated graphene synthetic fiber, seismic performance and flame retardancy can be improved, and emergency escape time can be secured in the event of a fire in the structure, minimizing human damage. It is possible to prepare for earthquakes that may occur at any time, which has the effect of significantly reducing earthquake damage.

Hereinafter, the present invention will be described in more detail based on examples. However, the scope of the present invention is not limited by the following examples.

[Example]

Example 1

(1) Surface treatment work: Deteriorated parts were removed from the surface of the concrete structure to be coated using a surface treatment device (e.g. sandpaper polishing), and dust and dirt on the surface of the structure were removed using a high-pressure water sprinkler.

(2) Repair of structural defects: After the above surface preparation work, defective parts of the structure (e.g., defective welds or cracks) were discovered, repair welding was performed using repair welding equipment, and injection repair was performed using urea injection agent. Additionally, moisture was completely removed using a special dehumidifying device.

(3) Undercoat application: A base paint was applied thinly to the surface on which the above surface treatment work was performed. The base paint used was a polyurea paint, which consists of a two-component type of a urethane prepolymer resin component and a hardener containing polyamine, and is mixed immediately before painting (mixing ratio of 100:50 by weight).

The curing agent used was a mixture of starfish calcium hydroxide nano extract and fluorinated graphene fiber at 4.0 parts by weight and 2.0 parts by weight, respectively, based on 100 parts by weight of the amine component.

At this time, the starfish calcium hydroxide extract is obtained by cutting the starfish shell with the internal organs removed, immersing it in acid and alcohol for 5 hours and 3 hours, respectively, and then heating it while immersed in water to obtain a precipitate (extract), filtering and drying the obtained extract. The starfish nano bio extract obtained was used.

In addition, the fluorinated graphene fiber was a graphene oxide fiber surface-modified with fluorine.

In addition, the base coat was first applied by brush painting, and after it dried, it was second coated by spray painting.

(4) Intermediate coating: An intermediate coating having the same composition as the primer was applied as a thick film to the surface on which the primer had been applied and hardened to a predetermined required thickness.

At this time, the painting was done by first brush painting and second spraying, and during the first brush painting, polyaliphatic ester with a weight average molecular weight of about 70,000 was mixed as a curing retardant in an amount of about 1.0 parts by weight compared to 100 parts by weight of the amine component in the hardener. It was used.

Example 2

After intermediate coating in the same manner as in Example 1, top coating was performed as follows.

(5) Top coat application: A top coat was applied using a solvent-free two-component urethane paint to the surface where the middle coat was applied and cured. The solvent-free two-component urethane paint contains 30 parts by weight of acrylic urethane resin, 20 parts by weight of silane, 3 parts by weight of wax, 5 parts by weight of bentonite, 2 parts by weight of urethane accelerator, 2.0 parts by weight of dispersant, 5 parts by weight of calcium carbonate, and 5 parts by weight of extender pigment. A solvent-free two-component urethane paint obtained by mixing parts and other additives was used, and the obtained solvent-free two-component urethane paint included heat shield powder (antimony tin oxide) in the range of about 2.0 parts by weight, and applied a predetermined amount to the surface on which the intermediate paint was applied. It was applied to the required thickness.

At this time, the acrylic urethane resin was obtained by reacting an acrylic polyol base having a solid content of about 85% by weight and an isocyanate curing agent in a solvent (xylene), and the coating was applied so that the total thickness of the coating film was maintained at about 250 ㎛.

Comparative Example 1

It was carried out in the same manner as in Example 1, except that (3) was carried out without applying a primer.

Comparative Example 2

It was carried out in the same manner as in Example 1, except that it was carried out without the intermediate application of (4) above.

performance evaluation

1. Evaluation of rust prevention, adhesion strength, acid resistance, bending resistance, and water resistance

The rust prevention, adhesion strength, acid resistance, bending resistance, and water resistance of the coating films formed according to Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated, and the results are shown in Table 1.

Sample Rust prevention
(ASTM D610) Adhesion strength
(KSM6715-01)
(kgf/㎠) acid resistance
(KSMSI02812-1-02) bending resistance
(KS M 5000-03, Φ10mm, 180°bend) water resistance
(KSMSI02812-2-02) Example 1 0.03% or less 140 clear clear clear Example 2 0.03% or less 150 clear clear clear Comparative Example 1 0.2% or less 94 clear clear clear Comparative Example 2 0.3% or less 105 clear clear clear

From the results in Table 1 above, it can be seen that when painting a structure using the paint composition prepared in the present invention, it has excellent properties in terms of rust prevention and adhesion strength, and also shows excellent results in other physical properties.

2. Flame retardancy, weather resistance, chloride ion penetration resistance, and impact resistance evaluation

The flame retardancy, weather resistance, chloride ion penetration resistance, and impact resistance of the coating films formed according to Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated. (Flame retardancy was evaluated using the UL94 method, and other physical properties were evaluated using the method of KS F 4929 (2010))

As a result of the evaluation, in the case of flame retardancy, the samples of Examples 1 and 2 according to the present invention showed self-extinguishing properties, but in the case of Comparative Examples 1 and 2, self-extinguishing properties were found to be insufficient. In addition, in terms of other physical properties, all samples showed satisfactory or satisfactory results.

From the above experimental results, it can be confirmed that the polyurea paint according to the present invention has excellent coating properties, such as excellent mechanical properties and chemical properties, when applied to a waterproof and anti-corrosive surface.

Claims (6)

(a) preparing the surface of the structure to be coated using a surface treatment device;
(b) dehumidifying welding defects and cracks in the organized structure and performing repair welding and injection repair;
(c) A two-component polyurea paint containing starfish calcium hydroxide nano extract and fluorinated graphene fibers on the surface of the above-organized structure, and consisting of a base material containing a urethane prepolymer obtained by the reaction of isocyanate and polyol and a curing agent containing polyamine. A step of applying a primer using a brush coating method;
(d) A two-component polyurea paint containing Kasari calcium hydroxide nano extract and fluorinated graphene fibers on the brush-painted surface, and consisting of a base material containing a urethane prepolymer obtained by the reaction of isocyanate and polyol, and a curing agent containing polyamine. Applying a primer using a spray coating method;
(e) applying an interior finishing paint to the surface using a brush coating method using a paint containing starfish calcium hydroxide nano extract and fluorinated graphene fibers in the two-component polyurea paint and adding a curing retardant; and
(f) applying an interior finishing paint to the surface using a paint containing starfish calcium hydroxide nano extract and fluorinated graphene fibers on the two-component polyurea paint using a spray coating method; a structure using a polyurea paint including As an eco-friendly waterproofing reinforcement construction method,
The starfish calcium hydroxide nano-extract is characterized in that it is obtained by sequentially immersing the starfish shell with the internal organs removed in acid and alcohol and heating it while immersed in water to obtain an extract, and filtering and drying the obtained extract,
The fluorinated graphene fiber is characterized by using graphene oxide fiber whose surface has been modified by fluorine. The graphene oxide is obtained by a process of exfoliating graphite using a strong acid and an oxidizing agent, and the oxidized graphene is obtained during the exfoliation process. It is characterized by the formation of an oxygen functional group on the pin, surface modification by fluorinated substances, and covalent bonding between graphene oxide and polyurea to induce uniform dispersion of graphene in the coating film.
The two-component polyurea paint is mixed with 5 to 40% by weight of mica with a particle size of 1 to 100㎛, 10 to 50% by weight of stone dust, 5 to 50% by weight of emulsion, 10 to 70% by weight of water, and 1 to 10% by weight of pigment. It is characterized in that it contains the ceramic pigment produced in the range of 0.1 to 5 parts by weight based on 100 parts by weight of the main ingredient,
After step (f) above,
(g) applying an external finishing paint to the surface using a brush coating method using a heat-insulating urethane paint containing heat-insulating powder; and
(h) applying an external finishing paint to the surface using a spray coating method using a heat-insulating urethane paint containing heat-insulating powder;
The heat-insulating urethane paint further includes silane, wax, bentonite, reaction accelerator, dispersant, calcium carbonate, and pigment,
An eco-friendly waterproofing method for structures using polyurea paint, characterized in that it additionally contains heat-insulating powder composed of one or more metal oxides selected from the group consisting of antimony tin oxide, indium tin oxide, cesium tungsten oxide, and antimony trioxide-zinc oxide. Reinforcement construction method.
delete delete The method of claim 1, wherein the curing retardant in (e) is polyaliphatic ester with a weight average molecular weight of 10,000 to 100,000.
delete delete