KR102207899B1 - Coating Composition for Wet Surface Adhesion and Construction Methods for Repairing and Reinforcing Crack of Concrete Structure Using Thereof - Google Patents

Abstract

The present invention provides a coating composition attachable to a wet surface, which is configured to form a coating layer coated with a base coat, a middle coat, and a top coat, and a crack repair and repair reinforcement method of a concrete structure using the same. The base coat includes 5 to 40 parts by weight of a diluent, 5 to 20 parts by weight of a curing agent, 5 to 10 parts by weight of an anionic emulsifier, and 1 to 10 parts by weight of a dispersant, based on 100 parts by weight of the epoxy resin constituting the base coat. The middle coat includes 5 to 40 parts by weight of a diluent and 5 to 20 parts by weight of a curing agent, based on 100 parts by weight of the epoxy resin constituting the middle coat. The top coat includes 1 to 10 parts by weight of octylphenol ethoxylate, 5 to 20 parts by weight of potassium nitrate, 1 to 20 parts by weight of polyvinyl alcohol powder, and 5 to 20 parts by weight of a curing agent, based on 100 parts by weight of the epoxy resin constituting the top coat. The coating composition attachable to a wet surface according to the present invention forms a physically/chemically stable coating film on a target surface for forming a coating film, specifically on a wet surface of a steel structure and/or concrete structure exposed to the outside, thereby preventing corrosion by providing corrosion resistance, stain resistance, chemical resistance and/or salt damage prevention, and the like.

Description

Coating Composition for Wet Surface Adhesion and Construction Methods for Repairing and Reinforcing Crack of Concrete Structure Using Thereof}

The present invention relates to a coating composition that can be attached to a wet surface and a crack repair and reinforcement method of concrete structures using the same, and more particularly, to steel structures such as bridges and steel bridges, offshore structures, steel plants, and/or concrete structures. A coating composition that can be attached to the wet surface to prevent corrosion and/or salt damage by protecting the surface by forming a coating film on the surface, specifically a wet surface with moisture, and the crack repair and repair reinforcement method of concrete structures using the same. About.

Coating composition has been developed from a long time ago and has been developed in various compositions to suit various uses.

Here, the coating composition is generally referred to as a paint (paint), and its use is applied to and adhered to the target surface of a product or structure made of various target surfaces, such as metal, tile, wood or concrete, This provides protection from external environments, such as pollutants and physical/chemical impacts.

On the other hand, it is common to form a waterproofing or anticorrosive coating film on the roof, outer wall, tunnel, basement, parking lot floor, and inner surface of a water treatment box of various buildings depending on the purpose. That is, anti-corrosive coatings are applied to ships or steel structures, and coatings with excellent strength and durability are formed on the floors of parking lots or industrial facilities.

Particularly, as a steel structure, steel is used for supporting the role of bridges and the like due to its excellent strength, and is currently widely used as a skeleton of various building structures.

However, despite the excellent strength of the steel, there is a problem that it is difficult to maintain durability for a long time due to the risk of corrosion.This is exposed to severe corrosive environments due to acid rain caused by industrialization, so the risk of corrosion of the steel structure increases more and more. Are doing.

On the other hand, the cause of corrosion of steel structures such as steel is caused by oxidation of the surface of the metal by moisture and oxygen, and when chloride ions are present, corrosion of the steel structure is further promoted and durability of the steel structure is deteriorated.

In particular, when steel is used as a support for bridges and structures, if corrosion occurs in the steel material, it cannot withstand the load of the bridge and the passing vehicle or train and bends, which can seriously damage the safety of the bridge and structure. There is this.

Watertight, floor, or anticorrosive coatings to prevent deterioration of properties such as corrosion of various structures or steel materials must be sufficiently adhered to the adherend to ensure watertightness, and volumetric deformation due to temperature difference between summer and winter, and impacts from outside Flexibility and behavioral response must be given to sufficiently withstand vibration.

As conventionally known as such a waterproofing method, there is a method of spraying a polyurea resin directly onto a concrete surface. In general, polyurea resins have excellent anti-rust and chemical resistance to form a flexible and smooth film, and by controlling the spray angle, they can form an embossing on the surface, thereby promoting anti-slip and aesthetic functions, and very reactivity and curing speed. It has the advantage of being fast and has been widely used for the purpose of forming waterproofing layers and flooring materials.

However, when the polyurea resin is directly sprayed on the concrete, the watertightness of the concrete is poor, causing pinholes and uneven surface. Therefore, in order to overcome the problem of pinhole generation, nonwoven fabric or asphalt sheet before applying the polyurea resin Although a method of paving has been tried, the process is also cumbersome, and there is a problem in that the walking feel is not good due to the nonwoven fabric or asphalt sheet in the case of the rooftop waterproofing.

In addition, when the waterproof layer is reinforced with a non-woven fabric, the surface of the non-woven fabric may become rough due to the coating material provided on the non-woven fabric, and moisture from the coating material or paint is quickly absorbed into the non-woven fabric, resulting in poor workability. Since it is difficult to form a hole through which the provided coating material can pass, it is difficult to form an insulation or a partially insulating waterproof structure, so that the response to the behavior of the mother body is poor, and the response to cracks or moisture of the mother body is poor.

As related prior art, Korean Patent Publication No. 10-0772329 (Name of the invention: waterproofing and flooring construction method using thixotropic urethane and fiber sheet, registration date: October 25, 2007), Korean Patent Publication No. 10-2046781 No. (Name of invention: crack repair and hybrid flooring construction method that can be attached to the wet surface, registration date: 2019.11.14.)

The present invention was created to solve the above problems, by forming a physically/chemically stable coating film on the target surface for forming the coating film, and specifically on the wet surface exposed to water, and thus corrosion resistance, contamination resistance, and chemical resistance. And/or it is intended to provide a coating composition that prevents corrosion, etc. by providing prevention of salt damage.

The present invention

As a coating composition that can be attached to the wet surface,

It is configured to form a coating layer coated with a bottom coat, a middle coat, and a top coat,

The undercoat includes 5 to 40 parts by weight of a diluent, 5 to 20 parts by weight of a curing agent, 5 to 10 parts by weight of an anionic emulsifier, and 1 to 10 parts by weight of a dispersant, based on 100 parts by weight of the epoxy resin constituting the undercoat,

The moderate degree includes 5 to 40 parts by weight of a diluent, and 5 to 20 parts by weight of a curing agent, based on 100 parts by weight of the epoxy resin constituting the intermediate degree,

The top coat is based on 100 parts by weight of the epoxy resin constituting the top coat, octylphenol ethoxylate 1 to 10 parts by weight, potassium nitrate 5 to 20 parts by weight, polyvinyl alcohol powder 1 to 20 parts by weight, and 5 to 20 parts by weight of a curing agent It provides a coating composition that can be attached to the wet surface including parts.

In addition, the present invention

Foreign matter removal step of removing contaminants from the target surface to be constructed;

After the foreign matter removing step is completed, based on 100 parts by weight of the epoxy resin constituting the undercoat on the target surface, 5 to 40 parts by weight of a diluent, 5 to 20 parts by weight of a curing agent, 5 to 10 parts by weight of an anionic emulsifier, and 1 to 10 dispersants An undercoat forming step of forming a coating layer including parts by weight;

An intermediate forming step of forming a coating layer including 5 to 40 parts by weight of a diluent and 5 to 20 parts by weight of a curing agent based on 100 parts by weight of an epoxy resin constituting an intermediate layer on the target surface where the undercoat forming step is completed; And

1 to 10 parts by weight of octylphenol ethoxylate, 5 to 20 parts by weight of potassium nitrate, 1 to 20 parts by weight of polyvinyl alcohol powder based on 100 parts by weight of the epoxy resin constituting the top coat on the target surface where the intermediate forming step has been completed It provides a coating composition construction method that can be attached to the wet surface comprising a top coat forming step of forming a top coat comprising 5 to 20 parts by weight of a curing agent.

The coating composition attachable to the wet surface according to the present invention forms a physically/chemically stable coating film on the wet surface of the target surface for forming a coating film, a steel structure and/or a concrete structure exposed to the outside, and corrosion resistance, Corrosion can be prevented by providing fouling resistance, chemical resistance and/or salt damage prevention.

Hereinafter, the present invention will be described in detail.

In one aspect, the present invention is a coating composition that can be attached to a wet surface, and is configured to form a coating layer coated with a bottom coat, a middle coat, and a top coat, and the bottom coat is based on 100 parts by weight of an epoxy resin constituting the bottom coat, and a diluent 5 to 40 parts by weight, 5 to 20 parts by weight of a curing agent, 5 to 10 parts by weight of an anionic emulsifier, and 1 to 10 parts by weight of a dispersant, and the medium is based on 100 parts by weight of the epoxy resin constituting the medium, and the diluent is 5 to 40 Includes parts by weight, and 5 to 20 parts by weight of a curing agent, and the top coat is 1 to 10 parts by weight of octylphenol ethoxylate, 5 to 20 parts by weight of potassium nitrate, polyvinyl alcohol based on 100 parts by weight of the epoxy resin constituting the top coat. It provides a coating composition that can be adhered to a wet surface comprising 1 to 20 parts by weight of a powder and 5 to 20 parts by weight of a curing agent.

In another aspect, the present invention is a foreign material removing step of removing contaminants on a target surface to be constructed; After the foreign matter removing step is completed, based on 100 parts by weight of the epoxy resin constituting the undercoat on the target surface, 5 to 40 parts by weight of a diluent, 5 to 20 parts by weight of a curing agent, 5 to 10 parts by weight of an anionic emulsifier, and 1 to 10 dispersants An undercoat forming step of forming a coating layer including parts by weight; An intermediate forming step of forming a coating layer including 5 to 40 parts by weight of a diluent and 5 to 20 parts by weight of a curing agent based on 100 parts by weight of an epoxy resin constituting an intermediate layer on the target surface where the undercoat forming step is completed; And 1 to 10 parts by weight of octylphenol ethoxylate, 5 to 20 parts by weight of potassium nitrate, 1 to 20 parts by weight of polyvinyl alcohol powder, based on 100 parts by weight of the epoxy resin constituting the top coat on the target surface where the intermediate forming step is completed. It provides a coating agent composition construction method that can be attached to a wet surface comprising a top coat forming step of forming a top coat including parts, and 5 to 20 parts by weight of a curing agent.

The coating composition according to the present invention, specifically the coating composition that can be attached to the wet surface, is formed by forming a coating film on the surface of steel structures such as bridges, steel bridges, offshore structures, steel plants and/or concrete structures to form a coating film. By protecting the surface, it is not particularly limited as long as it is a conventional coating composition in the art to prevent corrosion and/or salt damage.

The coating composition according to the present invention, specifically, a coating composition that can be attached to a wet surface, is configured to form a coating layer coated with a base coat, a middle coat, and a top coat.

The undercoat of the coating composition according to the present invention is coated on steel structures and/or concrete structures such as steel bridges and steel plants to form a coating film to protect the surface by preventing deterioration of the structure due to penetration of moisture and carbonate.

In addition, the undercoat of the coating composition according to the present invention is based on 100 parts by weight of the epoxy resin constituting the undercoat, 5 to 40 parts by weight of a diluent, 5 to 20 parts by weight of a curing agent, 5 to 10 parts by weight of an anionic emulsifier, and 1 to 10 parts by weight of a dispersant. Includes parts by weight.

The epoxy resin included in the undercoat according to the present invention is not particularly limited as long as it is an epoxy resin commonly used in the field of protective coatings, such as a conventional epoxy resin in the art, such as amine-modified epoxy, rubber-modified epoxy, etc., but preferably bisphenol A Type epoxy resin, a diglycidyl ether bisphenol A type epoxy resin (DGEBA) produced by condensation reaction with epichlorohyadrine, a phenol novolak type epoxy resin, and a cresol novolak type epoxy resin selected from the group consisting of I recommend you.

As a specific embodiment, the epoxy resin according to the present invention, specifically the epoxy resin included in the undercoat, is preferably an epoxy resin having a quantity of volatile organic compounds (VOCs) of 1.0 g/L or less in order to improve environment-friendliness.

The content of the remaining components other than the epoxy resin constituting the undercoat according to the present invention is based on 100 parts by weight of the epoxy resin.

The diluent constituting the undercoat according to the present invention is a substance that adjusts the viscosity of the composition constituting the undercoat, and any conventional diluent in the art having this purpose may be used, but preferably cresyl glycidyl Ether, Versatic Acid Glycidyl Ether, Phenyl Glycidyl Ether, 2-ethylhexyl Glycidyl Ether, Paratertiary Butyl Phenyl Glycidyl Ether, Neopentyl Diglycidyl Ether, 1,4-butane Digly It includes any one or more selected from the group consisting of cidyl ether and cyclohexanedimethanol diglycidyl ether.

A preferred amount of the diluent can be changed according to the user's selection, but it is recommended that it is 5 to 40 parts by weight based on 100 parts by weight of the epoxy resin constituting the base coat.

At this time, if the content of the diluent is less than 5 parts by weight, the effect of reducing the viscosity is insufficient, and the curing rate is significantly lowered. If the content exceeds 40 parts by weight, the desired due to mechanical properties such as hardness of the final cured product decrease. There is a problem that it is difficult to obtain physical properties.

The curing agent constituting the undercoat according to the present invention is for curing the composition constituting the undercoat to form a coating film, and any conventional curing agent in the art having this purpose may be used, but preferably, an amine mixture is used. For example, modified amine, aliphatic amine, polyoxyether polyamine mixture, triethanolamine, methyl diethanolamine, triisopropanol amine, polyamide amine curing agent resin, methyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate, 4- Dimethylaminobenzoic acid isamyl, 4-dimethylaminobenzoic acid 2-ethylhexyl, benzoic acid 2-dimethylaminoethyl, N,N-dimethylparatoluidine, 4,4'-bis(dimethylamino)benzophenone, 4,4'- Bis(diethylamino)benzophenone or at least one or more mixtures selected from these may be used, but more preferably, it is recommended to use a modified amine capable of curing in water, a polyamide amine-based curing resin, or an aliphatic amine.

The preferred amount of the curing agent is preferably 5 to 20 parts by weight based on 100 parts by weight of the epoxy resin constituting the undercoat.

The anionic emulsifier constituting the undercoat according to the present invention is to disperse the solid content in the form of fine particles when the composition is mixed with a solvent, and any conventional anionic emulsifier in the art for this purpose can be used. It's okay.

Preferred anionic emulsifiers include sodium resinate salt, lignin sulfonic acid alkali metal salt, naphthalene sulfonic acid derivative, chlorobenzene derivative, higher fatty acid alkali metal salt, alkylbenzene sulfonic acid salt, alpha-olefin sulfonic acid salt, poly Oxyethylene alkylphenyl ethers, sodium alkylarylsulfonic acid, or mixtures thereof may be used.

The amount of the anionic emulsifier is preferably 5 to 10 parts by weight based on 100 parts by weight of the epoxy resin constituting the undercoat.

The dispersant included in the undercoat according to the present invention is to improve adhesion of the components by imparting polarity to the composition constituting the undercoat, and to uniformly disperse the compositions, and any dispersant having this purpose can be used. It is also okay, but it is preferable to use one selected from the group consisting of organic acids, aromatic oils, aliphatic oils, animal and vegetable oils, castor oils, cottonseed oils, mineral oils, and mixtures thereof.

The preferred amount of the dispersant is preferably 1 to 10 parts by weight based on 100 parts by weight of the epoxy resin constituting the undercoat.

At this time, if the amount of the dispersant is less than 1 part by weight, there is almost no effect, and if it exceeds 10 parts by weight, the effect does not increase rapidly, which is not economical.

In a specific embodiment, the primer of the coating composition according to the present invention may further include 3 to 10 parts by weight of kaolin powder based on 100 parts by weight of the epoxy resin constituting the undercoat in order to prevent the composition durability and the coating film from being lifted.

Here, the kaolin powder preferably has a particle size of 1 to 3 µm, and if the amount of kaolin powder is less than 3 parts by weight, it is not effective in preventing lifting, and if it exceeds 10 parts by weight, the viscosity increases significantly and workability decreases. not.

As another specific embodiment, the primer of the coating composition according to the present invention may further include 1 to 5 parts by weight of ulsonite based on 100 parts by weight of the epoxy resin constituting the undercoat in order to improve the waterproofness and chemical resistance of the composition. .

Here, the ulsonite is a powder having excellent acicular absorption, replacing the organic thickener and adsorbing particles, for example, particles such as resin, on the surface of the powder particles, so that the slump of the composition is high, or the particles are caused by a vibration source intersecting during construction. It is added to suppress migration to the surface layer of the coating film, and in order to obtain the maximum effect, the conditions of hardness 4.5 to 5.0, specific gravity about 2.9, particle size 30㎛±5, aspect ratio 15:1 It is desirable to use what satisfies

In another specific embodiment, the primer composition according to the present invention is made of 1 to 5 parts by weight based on 100 parts by weight of an epoxy resin constituting the undercoat with mullite in order to improve strength, creep resistance, abrasion resistance, and fire resistance. The mullite is a mineral belonging to the orthorhombic system, and has a colorless or pink color, and contains a lot of aluminum oxide and silicon dioxide, but if less than 1 part by weight based on 100 parts by weight of the epoxy resin, strength, abrasion resistance, and The improvement effect such as fire resistance is insignificant, and if it exceeds 5 parts by weight, workability is deteriorated, which is not good.

As another specific embodiment, the undercoat of the coating composition according to the present invention may further include 3 to 15 parts by weight of a peeling inhibitor based on 100 parts by weight of the epoxy resin constituting the undercoat in order to prevent the coating film from easily peeling from the surface to be constructed. have.

It is preferable to use a polyphosphoric acid-based, amine-based, or phosphoric acid ester-based peeling inhibitor.

Specifically, the peeling inhibitor is a polyphosphoric acid-based peeling inhibitor having a specific gravity of 1.0 or more and a viscosity of 110 cPs at 60° C. in liquid form; It may be an amine-based peeling inhibitor having an acid value of 10 mgKOH/g or less and a total amine value of 140 to 400 mgHCl/g.

In another specific embodiment, the primer composition of the coating composition according to the present invention may further include 1 to 5 parts by weight of lithium hydroxide based on 100 parts by weight of the epoxy resin constituting the undercoat in order to improve curing reactivity.

In another specific embodiment, the primer of the coating composition according to the present invention further comprises 1 to 10 parts by weight of itaconic acid based on 100 parts by weight of the epoxy resin constituting the undercoat in order to maintain the dispersibility and fluidity of the composition for a certain period of time. Can include.

As another specific embodiment, the primer of the coating composition according to the present invention may further include 1 to 10 parts by weight of magnesium oxide based on 100 parts by weight of the epoxy resin constituting the undercoat in order to prevent the composition from shrinking.

Here, the magnesium oxide may provide an effect of firmly improving the surface to be repaired when moisture enters the surface to be constructed during construction.

In another specific aspect, the primer of the coating composition according to the present invention delays the initial reaction, improves workability and quality stability, as well as an epoxy resin comprising sodium oleate to increase the interfacial adhesion with the surface to be bonded. It may further contain 1 to 5 parts by weight based on 100 parts by weight.

The intermediate layer of the coating composition according to the present invention is to provide weather resistance, surface protection, corrosion resistance, etc. by coating on the upper portion of the undercoat to form a coating layer, and based on 100 parts by weight of the epoxy resin constituting the intermediate layer, diluent 5 to 40 parts by weight, and 5 to 20 parts by weight of a curing agent.

The epoxy resin included in the middle of the present invention is not particularly limited as long as it is an epoxy resin commonly used in the field of protective coatings, such as a conventional epoxy resin in the art, such as amine-modified epoxy, rubber-modified epoxy, etc., but preferably bisphenol A Type epoxy resin, a diglycidyl ether bisphenol A type epoxy resin (DGEBA) produced by condensation reaction with epichlorohyadrine, a phenol novolak type epoxy resin, and a cresol novolak type epoxy resin selected from the group consisting of I recommend you.

As a specific embodiment, the epoxy resin according to the present invention, preferably the epoxy resin contained in the middle, is preferably an epoxy resin having a quantity of volatile organic compounds (VOCs) of 1.0 g/L or less in order to improve environment-friendliness.

The content of the remaining components other than the epoxy resin constituting the intermediate composition according to the present invention is based on 100 parts by weight of the epoxy resin.

The diluent constituting the intermediate medium according to the present invention is a substance that adjusts the viscosity of the composition constituting the intermediate medium, and any conventional diluent in the art having this purpose may be used, but preferably cresyl glycidyl Ether, Versatic Acid Glycidyl Ether, Phenyl Glycidyl Ether, 2-ethylhexyl Glycidyl Ether, Paratertiary Butyl Phenyl Glycidyl Ether, Neopentyl Diglycidyl Ether, 1,4-butane Digly It includes any one or more selected from the group consisting of cidyl ether and cyclohexanedimethanol diglycidyl ether.

The preferred amount of the diluent can be changed according to the user's selection, but it is recommended that it is 5 to 40 parts by weight based on 100 parts by weight of the epoxy resin constituting the medium.

At this time, if the content of the diluent is less than 5 parts by weight, the effect of reducing the viscosity is insufficient, and the curing rate is significantly lowered. If the content exceeds 40 parts by weight, the desired due to mechanical properties such as hardness of the final cured product decrease. There is a problem that it is difficult to obtain physical properties.

The curing agent constituting the intermediate degree according to the present invention is for curing the composition constituting the intermediate degree to form a coating film, and any conventional curing agent in the art having this purpose may be used, but preferably, an amine mixture is used. For example, modified amine, aliphatic amine, polyoxyether polyamine mixture, triethanolamine, methyl diethanolamine, triisopropanol amine, polyamide amine curing agent resin, methyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate, 4- Dimethylaminobenzoic acid isamyl, 4-dimethylaminobenzoic acid 2-ethylhexyl, benzoic acid 2-dimethylaminoethyl, N,N-dimethylparatoluidine, 4,4'-bis(dimethylamino)benzophenone, 4,4'- Bis(diethylamino)benzophenone or at least one or more mixtures selected from these may be used, but more preferably, it is recommended to use a modified amine capable of curing in water, a polyamide amine-based curing resin, or an aliphatic amine.

The preferred amount of the curing agent can be changed according to the user's selection, but it is recommended that the amount is 5 to 20 parts by weight based on 100 parts by weight of the epoxy resin constituting the medium.

In a specific embodiment, the intermediate degree of the coating composition according to the present invention may further include 1 to 10 parts by weight of magnesium silicide based on 100 parts by weight of the epoxy resin constituting the intermediate degree in order to control the curing rate and improve waterproof and corrosion resistance. have.

In another specific embodiment, the intermediate degree of the coating composition according to the present invention is 1 to 3 parts by weight of tetramethylene diisocyanate based on 100 parts by weight of the epoxy resin constituting the intermediate degree in order to improve water resistance, chemical resistance and/or internal adhesion. It may contain more.

As another specific embodiment, the intermediate degree of the coating composition according to the present invention further comprises 3 to 15 parts by weight of vinyl acetate-diethyl maleate based on 100 parts by weight of the epoxy resin constituting the intermediate degree in order to improve the adhesive strength and durability of the composition. I can.

As another specific embodiment, the intermediate degree of the coating composition according to the present invention may further include 1 to 5 parts by weight of sorbitan monooleic acid ester based on 100 parts by weight of the epoxy resin constituting the intermediate degree in order to improve the strength and waterproof properties of the composition. have.

In another specific embodiment, the intermediate degree of the coating composition according to the present invention is 1 to 5 parts by weight of acetylated based on 100 parts by weight of the epoxy resin constituting the intermediate degree in order to improve the waterproofness, heat resistance, salt resistance and adhesion of the composition. It may include more surprises.

The top coat of the coating composition according to the present invention is coated on the upper part of the middle to form a coating layer, thereby preventing contamination and yellowing, imparting impact resistance, and as a finishing material for the purpose of preventing contamination and protecting the surface. Based on 100 parts by weight of the epoxy resin, 1 to 10 parts by weight of octylphenol ethoxylate, 5 to 20 parts by weight of potassium nitrate, 1 to 20 parts by weight of polyvinyl alcohol powder, and 5 to 20 parts by weight of a curing agent are included.

The epoxy resin included in the topcoat according to the present invention is not particularly limited as long as it is an epoxy resin commonly used in the field of protective coatings, such as a conventional epoxy resin in the art, such as amine-modified epoxy, rubber-modified epoxy, etc., but preferably bisphenol A Type epoxy resin, a diglycidyl ether bisphenol A type epoxy resin (DGEBA) produced by condensation reaction with epichlorohyadrine, a phenol novolak type epoxy resin, and a cresol novolak type epoxy resin selected from the group consisting of I recommend you.

As a specific embodiment, the epoxy resin according to the present invention, specifically the epoxy resin included in the top coat, is preferably an epoxy resin having a quantity of volatile organic compounds (VOCs) of 1.0 g/L or less in order to improve environment-friendliness.

The content of the remaining components other than the epoxy resin constituting the top coat according to the present invention is based on 100 parts by weight of the epoxy resin.

The octylphenol ethoxylate contained in the top coat according to the present invention is an ethoxylated octylphenol derivative, and is included in the top coat of the coating composition so that a waterproof coating film can be easily formed on the target surface.

A preferred amount of octylphenol ethoxylate is 1 to 10 parts by weight based on 100 parts by weight of the epoxy resin constituting the top coat.

Potassium nitrate according to the present invention is to fill the pores, increase the volume, and form a certain thickness, and for this purpose, any potassium nitrate commonly used in the art may be used, and the The amount used is preferably 5 to 20 parts by weight based on 100 parts by weight of the epoxy resin constituting the top coat.

The polyvinyl alcohol powder according to the present invention is to provide the light weight and rigidity of the top coat layer of the coating composition, and is not particularly limited as long as it is a conventional polyvinyl alcohol powder in the art for this purpose, but preferably 0.1 to 10 It is preferable to use polyvinyl alcohol powder containing µm pores in the range of 0.05 to 0.4 cc/g, and the amount of the amount is recommended to be 1 to 20 parts by weight based on 100 parts by weight of the epoxy resin constituting the top coat.

The curing agent constituting the top coat according to the present invention is for forming a coating film by curing the composition constituting the top coat, and any conventional curing agent in the art having this purpose may be used, but preferably, an amine mixture is used. For example, modified amine, aliphatic amine, polyoxyether polyamine mixture, triethanolamine, methyl diethanolamine, triisopropanol amine, polyamide amine curing agent resin, methyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate, 4- Dimethylaminobenzoic acid isamyl, 4-dimethylaminobenzoic acid 2-ethylhexyl, benzoic acid 2-dimethylaminoethyl, N,N-dimethylparatoluidine, 4,4'-bis(dimethylamino)benzophenone, 4,4'- Bis(diethylamino)benzophenone or at least one or more mixtures selected from these may be used, but more preferably, it is recommended to use a modified amine capable of curing in water, a polyamide amine-based curing resin, or an aliphatic amine.

The preferred amount of the curing agent can be changed according to the user's selection, but it is recommended that it is 5 to 20 parts by weight based on 100 parts by weight of the epoxy resin constituting the top coat.

In a specific embodiment, the top coat of the coating composition according to the present invention further comprises an amino-containing siloxane in order to effectively cure at room temperature and provide improved properties such as heat resistance, low temperature performance, chemical resistance, solvent resistance and oil resistance. I can.

The amino-containing siloxane is not particularly limited, and examples include aminomethylpolydimethylsiloxane, and the amount of the amino-containing siloxane is recommended to be 3 to 10 parts by weight based on 100 parts by weight of the epoxy resin constituting the top coat.

As another specific embodiment, the top coat of the coating composition according to the present invention may further include 1 to 5 parts by weight based on 100 parts by weight of an epoxy resin constituting the top coat of magnesium silicate for life extension.

Since the magnesium silicate has excellent physical properties in chemical resistance, chemical resistance, and weathering resistance, if it is included in the coating composition, specifically the top coat of the coating composition, the lifespan is extended by the above characteristics.

As another specific embodiment, the top coat of the coating composition according to the present invention may further include 1 to 5 parts by weight of an antioxidant based on 100 parts by weight of the epoxy resin constituting the top coat in order to prevent oxidation of the composition.

Preferred antioxidants may be amine-based, bisphenol-based, monophenol-based and sulfur-based antioxidants, but more specifically 2.2-methylenebis(4-methyl-6-t-butylphenol)[2. 2-M ethylenebis (4-methyl-6-t-butylphenol )], 2.6-di-t-butyl-4-methylphenol (2.6-di -t-Butyl-4-methylphenol) or mixtures thereof I recommend you.

As another specific embodiment, the top coat of the coating composition according to the present invention is an epoxy resin constituting the top coat for thermal reflection by reflecting, dispersing and/or scattering light irradiated from the outside after the coating film is formed, and specifically ultraviolet light. It may further include 1 to 10 parts by weight of metal powder based on 100 parts by weight.

The preferred metal powder is aluminum powder, zinc powder, brass powder, stainless steel powder, copper powder, or a mixture of at least one selected from these powders.

As another specific embodiment, the top coat of the coating composition according to the present invention may further include 1 to 10 parts by weight of a stabilizer based on 100 parts by weight of an epoxy resin constituting the top coat in order to provide stability by protecting the composition from ultraviolet rays.

As a preferred stabilizer, it is preferable to use an acrylic polyol resin, a non-yellowing polyurea resin, a polyisocyanate, or a mixture thereof.

As another specific embodiment, the top coat of the coating composition according to the present invention is 100 weight of epoxy resin constituting the top coat to improve physical performance such as adhesion and crack resistance, and to increase durability such as salt damage, freeze-thaw resistance, and abrasion resistance. It may further contain 1 to 5 parts by weight of modified sulfur on a part basis.

Here, the reformed sulfur refers to sulfur having improved properties by adding various substances to sulfur in order to use it in various industrial fields by improving the disadvantages of sulfur.

At this time, the sulfur is one of the non-metallic elements and is a material that is frequently generated during the desulfurization process of crude oil or natural gas. However, sulfur dissolves at a temperature of 119°C or higher, has a solid property at room temperature, has a flash point of 207°C, and has a ignition property with a spontaneous ignition temperature of 245°C, making it difficult to use in various industrial fields. . In order to solve these shortcomings, reformed sulfur was developed.

For example, modified sulfur is sulfur in dicyclo pentadiene (DCPD), vinyl toluene (vinyl toluene), dipentene (dipentene), olefin oligomer (olefin oligomer), tetrahydro indene (tetra hydraulic indene), etc. It can be prepared by adding a modifier.

In another specific embodiment, the top coat of the coating composition according to the present invention is 1 to 10 parts by weight of gamma-aminopropyltriethoxysilane based on 100 parts by weight of the epoxy resin constituting the top coat in order to improve deterioration prevention, heat resistance, and curing properties. It may further include.

In another specific embodiment, the top coat of the coating composition according to the present invention includes 1 to 5 parts by weight of trimethylolpropane triacrylate based on 100 parts by weight of the epoxy resin constituting the top coat in order to improve the hardness of the composition and reduce surface contamination. It may contain more.

In another specific embodiment, the top coat of the coating composition according to the present invention is 5 to 20 parts by weight based on 100 parts by weight of the epoxy resin constituting the top coat to provide color while improving physical properties such as gloss on the top coat of the coating composition. It may further include a pigment.

As a preferred pigment, carbon black, cobalt oxide, bismuth vanadium, titanium oxide, calcium carbonate, dolomite, clay, talc, mica, silica, or a mixture thereof may be used depending on the desired color.

In another aspect, the top coat of the coating composition according to the present invention may further include 1 to 5 parts by weight of sodium fluoride based on 100 parts by weight of the epoxy resin constituting the top coat in order to improve the filling properties and durability. Sodium primarily serves as a filler, but secondarily, it serves to improve durability, and the effect can be obtained in the above content range.

In another specific embodiment, the top coat of the coating composition according to the present invention absorbs moisture and prevents foaming, and prevents salt and/or moisture flowing into the composition from the outside to inhibit corrosion of the composition. It may further include 1 to 10 parts by weight of sepiolite based on 100 parts by weight of the epoxy resin constituting the, wherein the sepiolite is a mineral belonging to a monoclinic system having a hardness of 2 to 2.5 and a specific gravity of 2, which is included in the coating composition If you do, the above effect will be expressed.

In another specific embodiment, the top coat of the coating composition according to the present invention is based on 100 parts by weight of an epoxy resin constituting the top coat in order to improve acid resistance, alkali resistance, weather resistance, flame retardancy, antibacterial properties, sound insulation, abrasion resistance and impact resistance, etc. To 15 parts by weight of microscopic hollow sphere powder may be further included.

Here, the fine hollow body powder is a powder having fine hollows having a size of 30 to 100 micrometers containing aluminum silicate as a main component.

In another specific embodiment, the top coat of the coating composition according to the present invention is 100 weight of an epoxy resin constituting the top coat of 2-hydroxyethyl acrylate in order to accelerate curing of the composition and prevent the occurrence of cracks. It may further include 2 to 6 parts by weight based on parts.

As another specific embodiment, the top coat of the coating composition in the present invention is 1 to 5 parts by weight of poly 2-ethyl-based on 100 parts by weight of the epoxy resin constituting the top coat in order to improve adhesion, durability, and/or chemical resistance, etc. It may further include 2-oxazoline.

In another specific embodiment, the top coat of the coating composition according to the present invention includes 1 to 5 parts by weight of tetraaryl boron-ammonium complex based on 100 parts by weight of the epoxy resin constituting the top coat in order to improve the antifouling properties of the coating film formed by coating. It may contain more.

In another specific embodiment, the top coat of the coating composition according to the present invention is 1 to 5 based on 100 parts by weight of an epoxy resin constituting the top coat with sulfoxy polyethylene glycol allyl ether in order to facilitate mixing between the components and improve the stability of the composition. It may further include parts by weight.

As another specific embodiment, the top coat of the coating composition in the present invention may further include 1 to 10 parts by weight of polyputty based on 100 parts by weight of the epoxy resin constituting the top coat.

Here, the poly putty is used to promote surface hardening and prevent surface cracking through it, and such poly putty is usually made to have a viscosity and hardness suitable for use by adding a curing agent or resin powder to a polyester resin. will be.

In another specific embodiment, the top coat of the coating composition in the present invention further comprises 1 to 10 parts by weight of mono-tert-butyl-hydroquinone based on 100 parts by weight of the epoxy resin constituting the top coat in order to improve the bonding strength between the components. I can.

The construction method of the coating composition attachable to the wet surface according to the present invention having such a configuration, and the crack repair and repair reinforcement method of concrete structures using the coating composition specifically attachable to the wet surface will be described as follows.

Here, the following construction method is an aspect of the present invention, but is not limited thereto, preferably, a foreign substance removing step of removing contaminants on the target surface to be constructed;

After the foreign matter removing step is completed, based on 100 parts by weight of the epoxy resin constituting the undercoat on the target surface, 5 to 40 parts by weight of a diluent, 5 to 20 parts by weight of a curing agent, 5 to 10 parts by weight of an anionic emulsifier, and 1 to 10 dispersants An undercoat forming step of forming a coating layer including parts by weight;

An intermediate forming step of forming a coating layer including 5 to 40 parts by weight of a diluent and 5 to 20 parts by weight of a curing agent based on 100 parts by weight of an epoxy resin constituting an intermediate layer on the target surface where the undercoat forming step is completed; And

1 to 10 parts by weight of octylphenol ethoxylate, 5 to 20 parts by weight of potassium nitrate, 1 to 20 parts by weight of polyvinyl alcohol powder based on 100 parts by weight of the epoxy resin constituting the top coat on the target surface where the intermediate forming step has been completed , And a top coat forming step of forming a top coat comprising 5 to 20 parts by weight of a curing agent.

As a specific embodiment, the method of constructing the coating composition according to the present invention is the penetration of the composition forming the undercoat into the crack portion when the crack portion of the target surface is less than a predetermined size, for example, 0.2 mm after the foreign matter removing step is finished. After performing a V-shaped cutting operation on the crack part to facilitate the repair, the crack part is repaired by filling the crack part with a composition forming the undercoat,

When the crack portion of the target surface is the predetermined size, for example, 0.2 mm or more, a mesh-type elastic nonwoven fabric is disposed on the crack portion to facilitate penetration of the composition forming the undercoat into the crack portion, thereby removing the crack portion. It may further include a repair step to repair.

On the other hand, the construction method of the coating composition attachable to the wet surface according to the present invention, and the crack repair and reinforcement method of concrete structures using a coating composition that can be attached to the wet surface specifically is applied to a dry construction surface or a wet construction surface. All can be applied.

Hereinafter, the present invention will be described in detail through examples. However, the following examples are for illustrative purposes only and are not intended to limit the scope of the present invention by these examples.

[Example 1]

Mixing 100 g of bisphenol A type epoxy resin having a quantity of volatile organic compounds of 1.0 g/L or less, 20 g of cresyl glycidyl ether, 12 g of triethanolamine, 8 g of sodium resinate salt, and 6 g of aromatic oil; 100 g of bisphenol A type epoxy resin having a moderately volatile organic compound of 1.0 g/L or less, 20 g of cresyl glycidyl ether, and 12 g of triethanolamine were mixed; Topcoat: 100 g of bisphenol A type epoxy resin having a quantity of 1.0 g/L or less of volatile organic compounds, 5 g of octylphenol ethoxylate, 13 g of potassium nitrate, poly containing pores of about 5 μm in the range of about 0.05 to 0.2 cc/g 12 g of vinyl alcohol powder and 12 g of triethanolamine were mixed to prepare a coating composition capable of attaching to the wet surface.

[Example 2]

It was carried out in the same manner as in Example 1, but further added 6 g of kaolin powder having a particle size of about 2 μm to the base coat.

[Example 3]

It was carried out in the same manner as in Example 1, but was carried out by adding 3 g of ulsonite to the undercoat.

[Example 4]

It was carried out in the same manner as in Example 1, but was carried out by adding 3 g of mullite to the primer.

[Example 5]

It was carried out in the same manner as in Example 1, except that 10 g of a polyphosphoric acid-based peeling inhibitor having a specific gravity of 1.0 or more and a viscosity of 110 cPs at 60° C. was added to the undercoat.

[Example 6]

It was carried out in the same manner as in Example 1, but was carried out by adding 3 g of lithium hydroxide to the undercoat.

[Example 7]

It was carried out in the same manner as in Example 1, but was carried out by adding 5 g of itaconic acid to the primer.

[Example 8]

It was carried out in the same manner as in Example 1, but was carried out by adding 5 g of magnesium oxide to the undercoat.

[Example 9]

It was carried out in the same manner as in Example 1, but was carried out by adding 3 g of sodium oleate to the primer.

[Example 10]

It was carried out in the same manner as in Example 1, but was carried out by adding 5 g of magnesium silicide to the middle.

[Example 11]

It was carried out in the same manner as in Example 1, but was carried out by adding 3 g of tetramethylene diisocyanate to the middle.

[Example 12]

It was carried out in the same manner as in Example 1, but was carried out by adding 10 g of vinyl acetate-diethyl maleate to the middle.

[Example 13]

It was carried out in the same manner as in Example 1, but was carried out by adding 3 g of sorbitan monooleic acid ester to the middle.

[Example 14]

It was carried out in the same manner as in Example 1, but was carried out by adding 3 g of acetylated lanolin to the middle.

[Example 15]

It was carried out in the same manner as in Example 1, but was carried out by adding 7 g of aminomethylpolydimethylsiloxane to the top coat.

[Example 16]

It was carried out in the same manner as in Example 1, but was carried out by adding 3 g of magnesium silicate to the top coat.

[Example 17]

It was carried out in the same manner as in Example 1, but was carried out by adding 3 g of 2.2-methylenebis(4-methyl-6-t-butylphenol) to the top coat.

[Example 18]

It was carried out in the same manner as in Example 1, but was carried out by adding 5 g of aluminum powder to the top coat.

[Example 19]

It was carried out in the same manner as in Example 1, but was carried out by adding 5 g of an acrylic polyol resin to the top coat.

[Example 20]

It was carried out in the same manner as in Example 1, but further added 3 g of modified sulfur obtained by mixing sulfur and dicyclopentadiene as a modifier to the top coat.

[Example 21]

It was carried out in the same manner as in Example 1, but was carried out by adding 5 g of gamma-aminopropyltriethoxysilane to the top coat.

[Example 22]

It was carried out in the same manner as in Example 1, but was carried out by adding 3 g of trimethylolpropane triacrylate to the top coat.

[Example 23]

It was carried out in the same manner as in Example 1, but was carried out by adding 15 g of carbon black to the top coat.

[Example 24]

It was carried out in the same manner as in Example 1, but was carried out by adding 3 g of sodium fluoride to the top coat.

[Example 25]

It was carried out in the same manner as in Example 1, but was carried out by adding 5 g of sepiolite to the top coat.

[Example 26]

It was carried out in the same manner as in Example 1, but was carried out by adding 10 g of a micro-hollow powder having a micro-hollow size of about 60 micrometers as a main component of aluminum silicate to the top coat.

[Example 27]

It was carried out in the same manner as in Example 1, but was carried out by adding 4 g of 2-hydroxyethyl acrylate to the top coat.

[Example 28]

It was carried out in the same manner as in Example 1, but was carried out by adding 3 g of poly 2-ethyl-2-oxazoline to the top coat.

[Example 29]

It was carried out in the same manner as in Example 1, but was carried out by adding 3 g of tetraarylborone-ammonium complex to the top coat.

[Example 30]

It was carried out in the same manner as in Example 1, but was carried out by adding 3 g of sulfoxy polyethylene glycol allyl ether to the top coat.

[Example 31]

It was carried out in the same manner as in Example 1, but was carried out by adding 5 g of polyputty to the top coat.

[Example 32]

It was carried out in the same manner as in Example 1, except that 5 g of mono-tert-butyl-hydroquinone was further added to the top coat.

[Example 33]

It was carried out in the same manner as in Example 1, but all of the additives added in Examples 2 to 32 were added.

[Experiment]

A primer mixture having a thickness of about 75 μm was formed on the surface of a steel material having a size of 10 cm in width and length by applying the mixed primer mixture according to the examples twice using an air spray.

Then, the intermediate mixture was applied about twice on the surface of the undercoat using an air spray, thereby forming a medium thickness of about 100 μm.

Then, the top coat mixture was sprayed onto the intermediate surface using an air spray to form a top coat having a thickness of about 50 μm.

Then, the coating layer on which the coating was formed was dried to form a coating on the surface of the steel material.

The stability, surface hardness, waterproofness, plasticity change, adhesion and peelability of the coating film formed according to the above example were measured, and the results are shown in Table 1.

Stability (kg/f) Surface hardness (N/cm ² ) Waterproof (%) Plasticity change
(Change amount,mm) Adherence Peelability Example 1 1128 no problem 99 0.010534 good Unremoved Example 2 1124 no problem 99 0.010531 good Unremoved Example 3 1136 no problem 99 0.010524 good Unremoved Example 4 1137 no problem 99 0.010511 good Unremoved Example 5 1132 no problem 99 0.010529 good Unremoved Example 6 1131 no problem 99 0.010523 good Unremoved Example 7 1143 no problem 99 0.010543 good Unremoved Example 8 1156 no problem 99 0.010523 good Unremoved Example 9 1127 no problem 99 0.010531 good Unremoved Example 10 1133 no problem 99 0.010543 good Unremoved Example 11 1132 no problem 99 0.010522 good Unremoved Example 12 1134 no problem 99 0.010554 good Unremoved Example 13 1143 no problem 99 0.010543 good Unremoved Example 14 1131 no problem 99 0.010572 good Unremoved Example 15 1123 no problem 99 0.010534 good Unremoved Example 16 1135 no problem 99 0.010532 good Unremoved Example 17 1133 no problem 99 0.010524 good Unremoved Example 19 1145 no problem 99 0.010534 good Unremoved Example 20 1141 no problem 99 0.010532 good Unremoved Example 21 1165 no problem 99 0.010525 good Unremoved Example 22 1146 no problem 99 0.010523 good Unremoved Example 23 1132 no problem 99 0.010535 good Unremoved Example 24 1154 no problem 99 0.010523 good Unremoved Example 25 1137 no problem 99 0.010521 good Unremoved Example 26 1123 no problem 99 0.010554 good Unremoved Example 27 1134 no problem 99 0.010522 good Unremoved Example 28 1137 no problem 99 0.010524 good Unremoved Example 29 1132 no problem 99 0.010523 good Unremoved Example 30 1155 no problem 99 0.010543 good Unremoved Example 31 1145 no problem 99 0.010525 good Unremoved Example 32 1138 no problem 99 0.010543 good Unremoved Example 33 1134 no problem 99 0.010532 good Unremoved

As shown in Table 1, examples using the coating composition according to the present invention have little plasticity change, good waterproofness and adhesion, as well as no abnormality in surface hardness and not easily peeled off, and high stability, corrosion resistance and chemical resistance. I could confirm this high.

As described above, those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, all the embodiments described above are illustrative and should be understood as non-limiting. The scope of the present invention should be construed as including all altered or modified forms derived from the meaning and scope of the claims to be described later rather than the above detailed description, and equivalent concepts thereof.

Claims (5)

As a coating composition that can be attached to the wet surface
It is configured to form a coating layer coated with a bottom coat, a middle coat, and a top coat,
The undercoat includes 5 to 40 parts by weight of a diluent, 5 to 20 parts by weight of a curing agent, 5 to 10 parts by weight of an anionic emulsifier, and 1 to 10 parts by weight of a dispersant, based on 100 parts by weight of the epoxy resin constituting the undercoat,
The moderate degree includes 5 to 40 parts by weight of a diluent, and 5 to 20 parts by weight of a curing agent, based on 100 parts by weight of the epoxy resin constituting the intermediate degree,
The top coat is based on 100 parts by weight of the epoxy resin constituting the top coat, octylphenol ethoxylate 1 to 10 parts by weight, potassium nitrate 5 to 20 parts by weight, polyvinyl alcohol powder 1 to 20 parts by weight, and 5 to 20 parts by weight of a curing agent A coating composition that can be attached to a wet surface including parts.
The method of claim 1,
The epoxy resin is a coating composition that can be attached to a wet surface, comprising a volatile organic compound of 1.0 g / L or less.
The method of claim 1,
The polyvinyl alcohol powder is a coating composition that can be attached to a wet surface containing pores of 0.1 to 10 μm in the range of 0.05 to 0.4cc/g.
Foreign matter removal step of removing contaminants from the target surface to be constructed;
After the foreign matter removing step is completed, based on 100 parts by weight of the epoxy resin constituting the undercoat on the target surface, 5 to 40 parts by weight of a diluent, 5 to 20 parts by weight of a curing agent, 5 to 10 parts by weight of an anionic emulsifier, and 1 to 10 dispersants An undercoat forming step of forming a coating layer including parts by weight;
An intermediate forming step of forming a coating layer including 5 to 40 parts by weight of a diluent and 5 to 20 parts by weight of a curing agent based on 100 parts by weight of an epoxy resin constituting an intermediate layer on the target surface where the undercoat forming step is completed; And
1 to 10 parts by weight of octylphenol ethoxylate, 5 to 20 parts by weight of potassium nitrate, 1 to 20 parts by weight of polyvinyl alcohol powder based on 100 parts by weight of the epoxy resin constituting the top coat on the target surface where the intermediate forming step has been completed , And a coating composition construction method that can be attached to the wet surface comprising a top coat forming step of forming a top coat comprising 5 to 20 parts by weight of a curing agent.
The method of claim 4,
When the crack portion of the target surface is less than a predetermined size after the foreign matter removing step is finished, a V-shaped cutting operation is performed on the crack portion to facilitate penetration of the composition forming the undercoat into the crack portion, and the crack portion In the case where the crack portion is repaired by filling the composition forming the undercoat on the target surface, and the crack portion of the target surface is larger than the predetermined size, the crack portion is placed on the crack portion to facilitate penetration of the composition forming the undercoat into the crack portion. A method for constructing a coating composition attachable to a wet surface, further comprising a repair step of repairing the crack portion by disposing a mesh-type elastic nonwoven fabric.