KR102154749B1 - Paint composition for preventing neutralization of concrete structures and construction method using the same - Google Patents

Abstract

The present invention relates to a paint composition for preventing neutralization of a concrete structure with excellent long-term durability even with a thin film by forming a strong coating film on an applied area by using inorganic alkaline properties as it is, and to a construction method using the same. The anti-paint composition according to the present invention comprises: a main material including 20 to 100 parts by weight of a vinyl resin, 10 to 40 parts by weight of ceramic flake particles, and 1 to 20 parts by weight of a diluent based on 100 parts by weight of an acrylic polyol resin; and a polyisocyanate curing agent, wherein the mixing ratio of the main material and the curing agent is 1 : 1 to 5 : 1 by weight ratio.

Description

Coating composition for preventing neutralization of concrete structures and construction method using the same{PAINT COMPOSITION FOR PREVENTING NEUTRALIZATION OF CONCRETE STRUCTURES AND CONSTRUCTION METHOD USING THE SAME}

The present invention relates to a non-yellowing two-component coating composition containing acrylic polyol resin, vinyl resin and polyisocyanate curing agent as main components. A concrete structure by blocking the penetration of harmful elements that corrode the concrete structure by combining the resin main component and ceramic flake particles. It relates to a paint composition for preventing neutralization of concrete structures that efficiently maintains the durability of and a construction method using the same.

Neutralization of concrete is a phenomenon in which alkali in concrete and carbon dioxide gas in the atmosphere react, resulting in a decrease in durability. When the concrete is neutralized, the passivation membrane loses its resistance to corrosion of the fracture reinforcement. In order to prevent neutralization of concrete, thorough construction management is required through mixing design to secure high quality materials and strength.

When the inside of the concrete is above pH 11, it does not rust even in the presence of oxygen. When the pH concentration is lower than 11, rust occurs in the reinforcing bar and volume expansion occurs up to about 2.5 times that of the reinforcing bar.

Calcium hydroxide contained in concrete is strongly alkaline with a pH of 12 to 13. When subjected to the action of carbon dioxide gas in the air, the calcium hydroxide in the concrete gradually changes to calcium carbonate, and neutralization occurs in which the pH of the part changed to calcium carbonate decreases to about 8.5-10. That is, the passivation film is destroyed while neutralization occurs due to the penetration of carbon dioxide gas. After that, as reinforcement corrosion occurs, volume expansion and cracking occur, and neutralization of concrete is accelerated.

Damaged concrete structures are accelerating aging due to physical or chemical external factors and internal factors such as cracks, freezing damage, salt damage, corrosion, and erosion. When deterioration of the concrete structure occurs, repair or reinforcement work is required.

Therefore, it is important to select a coating composition and a construction method that can secure the durability of the structure in order to increase the durability of important facilities such as industrial complexes, airports, subways, highways, port facilities, and power plants and to secure economic efficiency.

Patent Publication No. 10-2008-0094427 (published on October 23, 2008)

An object of the present invention is to provide a coating composition for preventing neutralization excellent in long-term durability even with a thin film.

In addition, the present invention provides a coating composition for preventing neutralization, which is excellent in abrasion resistance and stain resistance, and can secure excellent adhesion even in a wet state.

It is also an object of the present invention to provide a construction method excellent in workability.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention that are not mentioned can be understood by the following description, and will be more clearly understood by examples of the present invention. In addition, it will be easily understood that the objects and advantages of the present invention can be realized by the means shown in the claims and combinations thereof.

The coating composition according to the present invention comprises a main body including 20 to 100 parts by weight of vinyl resin, 10 to 40 parts by weight of ceramic flake particles, and 1 to 20 parts by weight of a diluent based on 100 parts by weight of an acrylic polyol resin; And a polyisocyanate curing agent, wherein the mixing ratio of the main material and the curing agent is 1:1 to 5:1 by weight.

The construction method according to the present invention comprises the steps of: (a) cleaning the surface of the concrete structure to remove foreign substances; And (b) applying a primer to the surface of the concrete structure from which the foreign substances have been removed. (c) forming a coating film by applying a coating composition to the surface of the concrete structure to which the primer is applied; including, wherein the coating composition includes 20 to 100 parts by weight of vinyl resin, and a piece of ceramic based on 100 parts by weight of acrylic polyol resin. Subjects containing 10 to 40 parts by weight of particles, 1 to 20 parts by weight of a diluent; And a polyisocyanate curing agent, wherein the mixing ratio of the main material and the curing agent is 1:1 to 5:1 by weight.

The coating composition for preventing neutralization of a concrete structure according to the present invention is excellent in long-term durability even with a thin film by forming a strong coating film on the application site using inorganic alkaline properties as it is.

In addition, the paint composition according to the present invention has the effect of effectively maintaining the durability of the concrete structure and securing long-term stability by blocking the penetration of harmful elements that corrode the structure, including flake ceramic particles.

In addition, according to the construction method of the present invention, a thin metal film is formed on the surface of a concrete structure to inhibit the corrosion of the structure, block the penetration of harmful factors that cause corrosion, and prevent iron ionization by adopting a cathodic protection method. There is.

In addition to the above-described effects, specific effects of the present invention will be described together while describing specific details for carrying out the present invention.

The above-described objects, features, and advantages will be described later in detail with reference to the accompanying drawings, and accordingly, one of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the subject matter of the present invention, a detailed description will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar elements.

Hereinafter, it means that an arbitrary component is disposed on the "top (or lower)" of the component or the "top (or lower)" of the component, the arbitrary component is arranged in contact with the top (or bottom) of the component. In addition, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

In addition, when a component is described as being "connected", "coupled" or "connected" to another component, the components may be directly connected or connected to each other, but other components are "interposed" between each component. It is to be understood that "or, each component may be "connected", "coupled" or "connected" through other components.

Hereinafter, a paint composition for preventing neutralization of a concrete structure and a construction method using the same according to an embodiment of the present invention will be described.

The coating composition of the present invention is a non-yellowing-modified two-component coating composed mainly of an acrylic polyol resin, a vinyl resin, and a polyisocyanate curing agent. The coating composition exhibits excellent adhesion to concrete, iron and non-ferrous metals, excellent chemical resistance, durability and mechanical properties, as well as excellent effect in preventing neutralization of concrete.

The coating composition of the present invention is a two-component coating material comprising a main material and a curing agent, and the main material is 20 to 100 parts by weight of vinyl resin, 10 to 40 parts by weight of ceramic flake particles, 1 to 20 parts by weight of diluent based on 100 parts by weight of acrylic polyol resin. Includes parts by weight.

The acrylic polyol resin is a copolymer of an acrylic compound represented by [Chemical Formula 1], a hydroxyl group-containing acrylic compound represented by [Chemical Formula 2], and a vinyl monomer.

[Formula 1]

CH ₂ =CR ¹ COOR ²

[Formula 2]

CH ₂ =CR ³ COOR ⁴ OH

Each of R ¹ , R ² , R ³ and R ⁴ is a hydrogen atom or a C 1-6 alkyl group.

The acrylic compound represented by Formula 1 may include one or more of methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, isobutyl methacrylate, propyl methacrylate, and hexyl methacrylate. . Examples of the hydroxyl group-containing acrylic compound represented by Chemical Formula 2 include 2-hydroxymethyl acrylate, 2-hydroxydipropyl acrylate, 3-hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, and 2-hydroxy It may contain one or more of propyl methacrylate, 3-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, and 3-hydroxypropyl methacrylate. The vinyl monomer may include at least one of styrene and vinyl toluene.

An acrylic polyol resin composed of a copolymer of the acrylic compound, a hydroxyl group-containing acrylic compound, and a vinyl monomer exhibits excellent stain resistance, and improves chemical resistance and appearance of the coating film. The acrylic polyol resin may have a weight average molecular weight of 2000 to 20,000, a hydroxyl value of 10 to 150 mgKOH based on solid content, and a glass transition temperature (Tg) of -30 to 40°C.

The vinyl resin may include at least one of vinyl chloride resin, vinyl acetate resin, polyvinyl alcohol resin, polyvinyl acetal resin, and polyvinylidene chloride resin. It is preferable that the subject includes 20 to 100 parts by weight of a vinyl resin, based on 100 parts by weight of an acrylic polyol resin. When the amount of the vinyl resin added is out of this range, the durability, yellowing resistance, adhesion, stain resistance, deterioration prevention, and neutralization prevention effects may be insufficient.

Conventionally, in order to prevent neutralization of concrete structures, spherical ceramics were added to the paint composition as a general pigment.

However, in the conventional coating composition, resin A, rust-preventing pigment B, pigment and other C have a transverse connection structure. When the resin is deteriorated and oxidized due to the vertical adhesion of only resin A, the rust preventive pigment B, the pigment, and C are oxidized together and peeled off, thereby losing the surface protection effect for preventing neutralization.

The present invention shows a vertical connection structure of a coating composition including ceramic flake particles. Resin A and ceramic B are composited to have an interconnect structure in which resin A protects ceramic B and ceramic B protects resin A by synergistic action of resin A and ceramic B, apart from longitudinal adhesion. By this vertical connection structure, a dense coating film is formed that guarantees long-term durability of the concrete structure, and a surface protection effect for preventing neutralization of the concrete structure is exhibited.

As such, the ceramic flake particles included in the subject matter of the present invention exist in flake form, flat form, and flat form to block penetration of harmful elements that corrode the concrete structure. Accordingly, there is an effect of securing long-term stability of the structure by efficiently maintaining the durability of the concrete structure.

It is preferable that the ceramic flake particles include aluminum oxide (Al ₂ O ₃ ) which is excellent in strength and ductility and can exhibit impact resistance and abrasion resistance. Aluminum oxide is not easily soluble in water or acid, so it has excellent chemical resistance. In addition, when aluminum oxide is present in a composite state with the resin of the present invention, curing is fast during the formation of a coating film, and adhesion to a concrete structure is excellent.

It is preferable that the subject includes 10 to 40 parts by weight of ceramic flake particles based on 100 parts by weight of the acrylic polyol resin. When the amount of ceramic flake particles is out of this range, the effect of chemical resistance and adhesion may be insufficient.

The diameter of the flake particles may be approximately 0.1 to 150 μm, and if it is out of this range, it may be difficult to block the penetration of harmful elements due to insufficient compounding of the flake particles and the resin.

The diluent may be referred to as a thinner, and is an element that must be included in the coating composition as a role of maintaining the thickness of the coating film and improving workability during painting.

The diluent preferably contains at least one of a glycidyl ether-based diluent, an acetate-based diluent, a ketone-based diluent, and distilled water. The glycidyl ether-based diluent is butyl glycidyl ether, phenyl glycidyl ether, aliphatic glycidyl ether, carboxylic glycidyl ether, hexanediol diglycidyl ether, ethoxy glycidyl ether, polyethylene It may contain one or more of glycol diglycidyl ether, diethylene glycol diglycidyl ether, and 1-4-butanediol diglycidyl ether.

The acetate-based diluent may include at least one of butyl acetate, ethyl acetate, monomethyl ether acetate, ethylene vinyl acetate, polyvinyl acetate, and cellosolve acetate.

The ketone-based diluent may include one or more of methyl isoamyl ketone, diisobutyl ketone, 1-hydroxycyclohexylphenyl ketone, and methyl ethyl ketone.

It is preferable that the subject includes 1 to 20 parts by weight of a diluent based on 100 parts by weight of the acrylic polyol resin. When the added amount of the diluent is less than 1 part by weight, since the dilution effect is inferior, stirring of the coating composition is impossible. On the contrary, when the amount of the diluent exceeds 20 parts by weight, the main composition becomes too thin and may interfere with the reaction between the main material and the curing agent. In addition, as the coating film becomes too thin, it may be difficult to block harmful elements.

The subject may further include 1 to 5 parts by weight of tetrabutylphosphonium malonate based on 100 parts by weight of the acrylic polyol resin. When the tetrabutylphosphonium malonate is further included, it is easy to adjust the viscosity and can exhibit excellent adhesive strength in a wet environment.

It is preferable that the coating composition of the present invention contains a polyisocyanate curing agent together with the main material to prevent yellowing with curing. The polyisocyanate curing agent may include at least one of methylene diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.

The coating composition of the present invention may further include an additive further including at least one of a colorant, a hardening accelerator, a defoaming agent and a dispersing agent to prevent neutralization of concrete as well as improve physical properties. In this case, based on 100 parts by weight of the subject, it may be included in an amount of 0.1 to 5 parts by weight of the additive. If the amount of additives is out of this range, only the manufacturing cost increases without the effect of improving properties.

As the colorant, a colored pigment or dye for imparting color to the coating film may be used. The curing accelerator is for increasing the curing speed, and may include at least one of a bismuth-based catalyst phenol catalyst, dibutyl acetate catalyst, and monobutylene chloride dihydroxide catalyst. The antifoaming agent is used to impart a bubble removal function of the coating composition, and may include at least one of a defoaming agent including polysiloxane and a defoaming agent including polyacrylic. The dispersant is used to impart dispersibility of the coating composition and may include one or more of 1-methoxy-2-propylene acetate and an alkylol ammonium salt of a copolymer having an acidic group.

In the coating composition of the present invention, the mixing ratio of the main material and the curing agent is preferably 1:1 to 5:1 by weight, and more preferably 4:1 to 5:1. When the mixing ratio is out of this range, it is difficult to obtain desired coating properties.

The coating composition of the present invention may be prepared by stirring the main material and the curing agent at 20 to 40°C.

The coating composition of the present invention exhibits semi-gloss and matte at 60°C, and has a viscosity of 85-95Ku (Krebs unit) measured at 25°C, a flash point of about 20-25°C, a VOC content of 500-600gr/l, and a solids volume ratio. It may be about 38-42%.

In addition, the coating composition of the present invention is 180 to 210 μm for three coatings when the thickness of the coating film is about 70 μm per time, and the theoretical chart rate is about 1 to 3 m ² /l based on 200 μm. The specific gravity of the subject is 1.3~1.4, and the specific gravity of the hardener is 0.9~1.0. Drying time may be performed for 15 to 25 minutes to touch drying, 4 to 6 hours of hardening drying, 6 to 8 days of complete drying, and 20 to 30 minutes of forced drying based on about 20°C. Pot life may be about 7 to 8 hours based on about 20°C.

The construction method of the coating composition of the present invention is as follows.

First, the surface of the concrete structure is cleaned to remove foreign substances. Foreign substances such as rust, dust, oil and other contaminants can be removed with detergent or equipment. In order to form a coating film on the surface of the concrete structure, it is preferable to completely dry the surface of the structure. For example, it is preferable that the concrete structure is strongly alkaline, and has a pH of 7 to 10 and a water content of 5% or less. When the moisture content exceeds 5%, there is a problem in that air bubbles are generated in the applied portion during the painting operation, or the adhesion of the coating film to the structure surface is lowered and the coating film properties are deteriorated.

Next, a primer is applied to the surface of the concrete structure from which the foreign substances have been removed, and pretreatment is performed to form a coating film. The primer may be an acrylic primer, a urethane primer, an epoxy primer, or the like, but is not limited thereto.

By applying the primer before forming the coating film in the construction method of the present invention, it is possible to uniformly form a thin coating film.

Next, a coating composition is applied to the surface of the concrete structure to which the primer is applied to form a coating film. The coating composition includes a main material including 20 to 100 parts by weight of a vinyl resin, 10 to 40 parts by weight of ceramic flake particles, 1 to 20 parts by weight of a diluent, and a polyisocyanate curing agent based on 100 parts by weight of an acrylic polyol resin. In addition, the mixing ratio of the main material and the curing agent may be 1:1 to 5:1 by weight. Matters on the coating composition are as described above.

In the construction method of the present invention, the coating method may be performed with a brush, roller or air spray, and any means capable of applying a paint composition may be used without limitation.

In the construction method of the present invention, a coating composition having a thickness of 100 to 300 μm may be formed by applying the coating composition at least once or more to a maximum of 3 times. When painting, drying time can be carried out at 20 ~ 30 ℃ for a maximum of 24 hours.

As described above, according to the present invention, as a coating composition using inorganic alkaline properties is used as it is, durability is excellent even with a thin film of 300 μm or less. In particular, it is possible to efficiently maintain the durability of the concrete structure by blocking the penetration of harmful elements that corrode the structure by the coating composition in which the resin and ceramic flaky particles are mixed.

In addition, when the coating composition of the present invention is coated on the surface of a concrete structure, the coating composition exhibits strong adhesion, so that the concrete structure and the coating film are integrated, thereby enhancing the aesthetics of the structure.

As described above, specific examples of the coating composition for preventing neutralization of the concrete structure and the construction method using the same are as follows.

1. Paint manufacturing

As shown in Tables 1 and 2 below, based on 100 parts by weight of an acrylic polyol resin, a composition ratio was added and stirred at 30° C. to prepare a paint. 1)~5) are the main material, 6) are the hardener, and 7)~8) are the additives. The mixing ratio of the main material and the curing agent was described as a weight ratio.

[Table 1]

[Table 2]

1) Acrylic polyol resin: Made of a copolymer of methyl acrylate, 2-hydroxyethyl methacrylate, and styrene. The acrylic polyol resin has a weight average molecular weight of 4500, a hydroxyl value of 90 mgKOH based on a solid content, and a glass transition temperature (Tg) of 20°C.

2) Vinyl resin: As a copolymer resin of vinyl chloride resin and polyvinyl alcohol resin, it has a weight average molecular weight of 27,000 and a hydroxyl value of 76 mgKOH based on solid content.

3) Ceramic flake particle: Aluminum oxide (Al ₂ O ₃ ) with an average diameter of 70 to 90 µm, ^a) is a spherical particle.

4) Diluent: 1: 1 mixture of hexanediol diglycidyl ether and ethoxyglycidyl ether in a weight ratio.

6) hardener; It is a mixture of hexamethylene diisocyanate and isophorone diisocyanate in a weight ratio of 1:1.

7) Antifoam: Polysiloxane

8) Dispersant: 1-methoxy-2-propylene acetate

2. Coating material property evaluation method and result

Examples 1 to 16 below are coating films formed from Preparation Examples 1 to 16, respectively.

[Table 3]

After washing the concrete specimen to remove foreign substances, the specimen was completely dried. Thereafter, the urethane primer was applied to a thickness of 10 μm. Thereafter, using a roller, the paints of Preparation Examples 1 to 16 were applied once to three times to the concrete specimen to form a coating film.

1) Type B viscosity: Put the sample in a 150 mL glass bottle, immerse the sample in a constant temperature water bath adjusted to 25.0±0.1° C. for at least 2 hours to make the sample constant temperature, and set the rotation speed to 10 rpm with a TVB-10 type viscometer. It was measured with the rotor of.

2) Specific gravity: At 25±0.1°C, the specific gravity was calculated by filling a coating material in a specific gravity cup having a capacity of 100 mL and measuring the mass.

3) Drying time: The time when the coating film is cured and dried was measured.

[Table 4]

4) Adhesion strength: Adhesion strength was measured by applying a tensile force using an adhesion tester according to KS F 4715-01 and JIS A 6910 standards. It is shown in Table 4 as the average value tested three times.

5) Neutralization prevention performance: The neutralization acceleration test was conducted by putting it in an acceleration tester capable of controlling the concentration of carbon dioxide, and the test conditions were a temperature of 40°C, a relative humidity of 50%, and a CO ₂ concentration of 10%. The neutralization depth was measured every 4 weeks, 8 weeks, and 13 weeks from the start of palpation. As a measurement method, the compressive strength was measured by KS L 5105, and after spraying a 1% phenolphthalein solution on the cross section, the neutralization depth was calculated according to whether or not coloring. When neutralization did not proceed, it was marked as "-".

6) Flexural resistance: If the sample is bent and cracks or cracks do not occur, it is marked as "excellent" and if it occurs, it is marked as "defective".

7) Salt water resistance: Tested according to the KS M ISO2812-1 test method, and conducted at 25°C using 10wt% NaOH aqueous solution.

8) Accelerated weathering resistance: Tested according to KS F2274 test method.

Referring to the results of Table 4, when tetrabutyl phosphonium malonate is further added to the coating composition, it shows a remarkably excellent effect in all physical properties along with adhesive strength.

On the other hand, when the content of the vinyl resin in the paint composition is exceeded, the content of the ceramic flaky particles is removed, or the mixing ratio of the main material and the curing agent is out of the range, the physical properties are deteriorated.

And ASTM D 4060 abrasion test measurement results, the coating composition of the present invention showed 58 ~ 67mg. Compared to the existing urethane of about 2000 mg and the conventional epoxy of about 450 mg, the coating composition of the present invention exhibited about 5 times more than that of epoxy and about 20 times more than that of urethane, showing excellent results in abrasion.

That is, since the coating film using the coating composition of the present invention has a smooth surface, low friction, and excellent abrasion resistance, it is possible to increase the life of environmental structures having a large amount of high pressure or repetitive flow velocity.

In addition, the degree of penetration of the deterioration factor in the test piece may show a difference of approximately 30 times or more when painted and when not painted.

By using the coating composition of the present invention, it is possible to secure an important long-term adhesive strength of not only initial strength but also coating quality, and excellent adhesion even in a wet state of up to 12% surface humidity. Accordingly, it is possible to improve durability by preventing dropping between the concrete interface and the coating film.

In addition, the coating composition of the present invention can prevent penetration of corrosion factors and increase the durability of the structure by protecting microcracks of a structure and securing adaptability to structure deformation by combining ductile ceramic flaky particles and resin. .

In addition, the construction method of the present invention has excellent water-repellent properties, water resistance, and anticorrosive properties, so that waterproofing and anticorrosive effects can be obtained at the same time as the construction, thereby reducing the time period.

As described above with reference to the drawings illustrated for the present invention, the present invention is not limited by the embodiments and drawings disclosed in the present specification, and various by a person skilled in the art within the scope of the technical idea of the present invention. It is obvious that transformation can be made. In addition, even if not explicitly described and described the effects of the configuration of the present invention while describing the embodiments of the present invention, it is natural that the predictable effects of the configuration should also be recognized.

Claims (8)

Based on 100 parts by weight of the acrylic polyol resin, 20 to 100 parts by weight of a vinyl resin, 10 to 40 parts by weight of ceramic flake particles including aluminum oxide (Al ₂ O ₃ ), and a main body including 1 to 20 parts by weight of a diluent; And
Including; polyisocyanate curing agent;
The mixing ratio of the main material and the curing agent is 1: 1 to 5: 1 in weight ratio,
The acrylic polyol resin is a copolymer of an acrylic compound represented by [Chemical Formula 1], a hydroxyl group-containing acrylic compound represented by [Chemical Formula 2], and a vinyl monomer,
The average diameter of the ceramic flake particles is 70 ~ 90㎛,
The diluent includes at least one of a glycidyl ether-based diluent, an acetate-based diluent, and distilled water,
The coating composition is a coating composition having a viscosity of 85 to 95Ku at 25°C.
[Formula 1]
CH ₂ =CR ¹ COOR ²
[Formula 2]
CH ₂ =CR ³ COOR ⁴ OH
Each of R ¹ , R ² , R ³ and R ⁴ is a hydrogen atom or a C 1-6 alkyl group.
delete The method of claim 1,
The vinyl resin is a coating composition comprising at least one of vinyl chloride resin, vinyl acetate resin, polyvinyl alcohol resin, polyvinyl acetal resin, and polyvinylidene chloride resin.
delete delete delete (a) cleaning the surface of the concrete structure to remove foreign substances; And
(b) applying a primer to the surface of the concrete structure from which the foreign substances have been removed;
(c) forming a coating film by applying a coating composition at least once or more on the surface of the concrete structure to which the primer has been applied; including,
The coating composition is
Based on 100 parts by weight of the acrylic polyol resin, 20 to 100 parts by weight of a vinyl resin, 10 to 40 parts by weight of ceramic flake particles including aluminum oxide (Al ₂ O ₃ ), a main body including 1 to 20 parts by weight of a diluent; And
Including; polyisocyanate curing agent;
The mixing ratio of the main material and the curing agent is 1: 1 to 5: 1 by weight ratio,
The acrylic polyol resin is a copolymer of an acrylic compound represented by [Chemical Formula 1], a hydroxyl group-containing acrylic compound represented by [Chemical Formula 2], and a vinyl monomer,
The average diameter of the ceramic flake particles is 70 ~ 90㎛,
The diluent includes at least one of a glycidyl ether-based diluent, an acetate-based diluent, and distilled water,
The coating composition is a 25 ℃ viscosity of 85 ~ 95Ku construction method.
[Formula 1]
CH ₂ =CR ¹ COOR ²
[Formula 2]
CH ₂ =CR ³ COOR ⁴ OH
Each of R ¹ , R ² , R ³ and R ⁴ is a hydrogen atom or a C 1-6 alkyl group.
delete