KR20210155143A - Nonflammable Coating Composition and Kit for Preparing the Same - Google Patents

Abstract

The present invention discloses a non-flammable coating composition including a water-soluble binder resin, expanded graphite, and an aqueous solution of a silane compound to which a trace amount of an acid is added. An acryl-based resin, a polyol, or a mixture thereof is used as the water-soluble binder resin. According to the present invention, the non-flammable coating composition containing expanded graphite preferably includes 3 to 30 parts by weight of an aqueous solution of a silane compound in which 30 to 70 parts by weight of the expanded graphite and a trace amount of an acid are added to 100 parts by weight of a water-soluble binder resin. The aqueous solution of the silane compound is a solution in which the silane compound and water are mixed in a weight ratio of 1:0.3 to 2.0, and 0.3 to 3.0 parts by weight of the acid is added and mixed. Since the coating composition according to the present invention gels within a few hours, the coating composition is provided as a composition kit without being distributed as a composition itself, in which the composition kit includes a mixture (I) in which expanded graphite is mixed with a water-soluble binder resin, and a silane compound (II) to which a trace amount of an acid is added. In a work site, an aqueous solution of a silane compound (III) to which the trace amount of the acid is added is prepared by mixing the silane compound to which the trace amount of the acid is added with the water in a weight ratio of about 1:0.3 to 2.0. The mixture (I) is a mixture obtained by mixing 100 parts by weight of the water-soluble binder resin with 30 to 70 parts by weight of the expanded graphite. When 2 to 23 parts by weight of the aqueous solution of the silane compound (III) is mixed with 100 parts by weight of the mixture (I) and stirred, the coating composition according to the present invention is manufactured.

Description

Nonflammable Coating Composition and Kit for Preparing the Same Containing Expanded Graphite

The present invention relates to various constructions such as steel, wood, plywood, paper, aluminum sheet (aluminum foil), fabric sheet, non-woven sheet, Styrofoam, urethane foam, PE foam, etc. It relates to a non-combustible coating composition for imparting non-combustibility or flame retardancy by applying to materials or applying to the inner or outer walls of buildings. More specifically, the present invention relates to a non-combustible coating composition containing expandable graphite and a kit for preparing the composition.

A non-flammable coating composition for forming a non-flammable or flame-retardant coating film by applying it to the inner or outer wall of a building or applying it to various building materials has been developed by various methods.

As one method for preparing the non-combustible coating composition, there is a method of using expandable graphite.

Expanded graphite is dried by permeating acidic compounds between layers of graphite by chemically treating natural flake graphite with an acidic material. It expands 200 to 300 times when heated to 150° C. or higher, and has a particle size of 60 to 300 mesh. Since expanded graphite itself is non-combustible, it is variously applied to non-flammable or flame-retardant products.

Korean Patent No. 0982176 discloses a non-flammable composition comprising a phosphorus-based flame retardant containing a carboxylic acid derivative, a metal oxide, and expanded graphite, wherein the metal oxide is sodium oxide, magnesium oxide, calcium oxide, aluminum oxide, barium oxide and/or zinc oxide. A heat insulating paste composition is disclosed.

Korean Patent No. 0996720 discloses a composition for forming a non-combustible coating film comprising an acrylic resin and/or a vinyl resin binder resin, water, expandable graphite, and white kerosene, and excellent drying speed and long-term storage properties, obtained from the composition The non-combustible coating film is disclosed as being excellent in water resistance, heat resistance, and mechanical strength as well as incombustibility.

Korean Patent No. 1601708 discloses a method for manufacturing a non-combustible coating film by immersing expanded graphite, which is expanded by heating it to 200 ~ 1,000°C, in a coating agent, and pulverizing the expanded graphite immersed in the coating agent in that state. do.

Korean Patent Laid-Open No. 2019-0111598 discloses a method of forming a non-flammable expanded graphite coating film on a phenolic foam by applying a composition mixed with expanded graphite, an adhesive resin, and an organic solvent on the surface of a phenolic foam formed by foam molding a phenolic resin mixture to start

The present inventor adheres a glass fiber fabric to the surface of a substrate with a composition mixed with water glass and expanded graphite, and applies a gelling agent composition for gelling by bonding with water glass to the adhered glass fiber fabric to form a non-combustible coating layer A characteristic architectural panel was developed and filed as Patent Application No. 2018-20690 (filed on February 21, 2018).

Expanded graphite is an important component of a coating composition for forming a non-flammable or flame-retardant coating film because it is incombustible. Because expanded graphite expands 200 to 300 times when heated to 150° C. or higher, if the expanded graphite does not scatter and forms a fixed graphite layer, the graphite layer will produce flame retardant, heat-shielding, and heat-insulating effects, and further combustion will not proceed. it may not be However, if the expanded graphite scatters, flame retardancy, heat shielding, and thermal insulation effects cannot be expected, and combustion proceeds and the fire is amplified.

Another problem of the non-combustible coating composition is that the thickness of the coating film formed on the substrate must be thin. In the conventional non-flammable coating composition, the thickness of the coating film is 3 mm or more and about 20 mm, but in some cases it exceeds 100 mm. As such, when the thickness of the coating film is increased, a detachment phenomenon occurs in which the coating film is separated from the substrate by the load of the coating film itself over time. In particular, when a coating film is formed on the ceiling rather than the wall surface, the detachment phenomenon is more serious. However, when the thickness of the coating film is thin, a problem of poor incombustibility occurs. Due to these conflicting reasons, the development of a coating composition having a thin coating film and excellent incombustibility has not yet been successful.

The present inventors found that, when the non-combustible coating film is burned, the expanded graphite does not scatter and expands to form a fixed graphite layer, so that combustion does not proceed further, and the non-combustible coating composition containing the expanded graphite of the present invention has excellent incombustibility even when the coating film is formed thin. is too early to develop.

An object of the present invention is to provide a novel non-combustible coating composition capable of forming a fixed graphite layer by expanding without scattering expanded graphite when non-combustible coatings formed on various building materials, including external or internal walls of a building, are burned.

Another object of the present invention is to provide a non-combustible coating composition containing expanded graphite capable of maximizing flame retardancy, heat shielding and heat insulation effects by forming a graphite layer that is expanded and fixed without scattering when the non-combustible coating film is burned. will be.

Another object of the present invention is to provide a non-combustible coating composition containing expanded graphite having excellent non-combustibility even when a thin coating film is formed.

Another object of the present invention is to form a non-combustible coating composition containing expanded graphite having excellent incombustibility even when the non-combustible coating film is burnt, and the expanded graphite does not scatter and expands to form a fixed graphite layer, and the coating film is thinly formed. (kit) to provide.

The above and other objects of the present invention can all be achieved by the present invention described in detail below.

The non-flammable coating composition containing expanded graphite according to the present invention is characterized in that it includes a water-soluble binder resin, expanded graphite, and an aqueous solution of a silane compound to which a trace amount of acid is added.

As the water-soluble binder resin, an acrylic resin, a polyol, or a mixture thereof may be used. As the polyol, polyester polyol or polyether polyol may be preferably used.

Expanded graphite expands 100 to 300 times when heated to 150° C. or higher and has a particle size of 60 to 300 mesh, and a carbon component of 95 wt % or more is preferably used.

The silane compound aqueous solution is a solution in which a silane compound is dissolved in water, and a trace amount of acid is added thereto. Silane compounds include methyltrimethoxysilane (CH ₃ -Si-(OCH ₃ ) ₃ ), tetraethoxysilane (Si-(OC ₂ H ₅ ) ₄ ), glycidoxypropyltrimethoxysilane (CH ₂ (O) )CHCH ₂ OC ₃ H ₆ -Si-(OCH ₃ ) ₃ ), methacryloxypropyltrimethoxysilane (H ₂ C=CH(CH ₃ )C(O)OC ₃ H ₆ -Si-(OCH ₃ ) ₃ ), and vinyltrimethoxysilane (H ₂ C=CH-Si-(OCH ₃ ) ₃ ). Methyltrimethoxysilane (MTMS) can be preferably used.

A trace amount of acid is added to the silane compound, and examples of the added acid include acetic acid, hydrochloric acid, sulfuric acid, nitric acid, and the like. The silane compound to which a trace amount of acid is added has good storage stability because it does not change or gel even after one year or more.

The nonflammable coating composition containing expanded graphite according to the present invention preferably contains 3 to 30 parts by weight of an aqueous solution of a silane compound in which 30 to 70 parts by weight of expanded graphite and a trace amount of acid are added to 100 parts by weight of the water-soluble binder resin.

The silane compound aqueous solution is a solution in which a silane compound and water are mixed in a weight ratio of 1:0.3 to 2.0, and 0.3 to 3.0 parts by weight of an acid is added and mixed. It is simplest to mix the silane compound and water in a weight ratio of 1:1, and it is preferable to mix them in a weight ratio of 1:0.8 to 1.2.

The nonflammable coating composition of the present invention, which is composed of a mixture of a water-soluble binder resin, expanded graphite, and an aqueous solution of a silane compound to which a small amount of acid is added, gels within a few hours, at most within 1 to 2 hours due to the silane compound. This is because the silane compound acts as a gelling agent in the coating composition. Therefore, it must be applied before gelation.

The coating composition of the present invention cannot be distributed as a composition as it gels within a few hours. Accordingly, in order to prepare the coating composition of the present invention, it should be provided as a composition kit. The composition kit for preparing the coating composition of the present invention is composed of a mixture (I) in which expanded graphite is mixed with a water-soluble binder resin, and a silane compound (II) to which a trace amount of acid is added. At the work site, an aqueous solution of a silane compound (III) with a trace amount of acid is prepared by mixing a silane compound to which a trace amount of acid is added and water in a weight ratio of about 1:0.3 to 2.0.

The mixture (I) is a mixture of 100 parts by weight of a water-soluble binder resin and 30 to 70 parts by weight of expanded graphite. When 2 to 23 parts by weight of the silane compound aqueous solution (III) are mixed with 100 parts by weight of the mixture (I) and stirred, the coating composition of the present invention is prepared. 10 to 15 parts by weight of the silane compound aqueous solution (III) is preferably mixed with 100 parts by weight of the mixture (I). The coating composition contains 30 to 70 parts by weight of expanded graphite and 3 to 30 parts by weight of an aqueous solution of a silane compound to which a trace amount of acid is added when converted based on 100 parts by weight of the water-soluble binder resin.

The method for preparing the silane compound aqueous solution (III) is prepared by mixing a silane compound to which a trace amount of acid is added and water in a weight ratio of about 1:0.3 to 2.0 and stirring for 30 minutes to 1 hour.

The coating composition of the present invention is prepared by mixing 2 to 23 parts by weight of the silane compound aqueous solution (III) with 100 parts by weight of the mixture (I) and stirring for 30 minutes to 1 hour.

The silane compound is hydrolyzed by water in the aqueous solution, the aqueous binder resin is also dissolved in the water, and the expanded graphite particles are homogeneously dispersed in the aqueous solution.

The non-flammable coating composition of the present invention is applied 1 to 3 times to various building materials including insulation materials or to the inner and outer walls of buildings to form a 0.1 to 2.0 mm thick coating film. The expanded graphite contained in the coating film does not scatter during or after combustion by chemical bonding between the binder resin and the silane compound, and forms a graphite layer that adheres to the substrate, thereby maximizing flame retardancy, heat shielding, and heat insulation effects.

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

In the present invention, when a non-combustible coating film formed on various building materials, including the outer or inner wall of a building, is burned, the expanded graphite expands without scattering to form a fixed graphite layer, and a thin coating film is formed to cause the detachment of the coating film. It does not, and thereby has the effect of the invention to provide a non-flammable coating composition containing expanded graphite that can maximize the effect of flame retardancy, heat shielding, and heat insulation.

1 is a photograph of burning a non-combustible coating film 11 formed by applying the non-flammable coating composition of the present invention to one substrate 10 once with a torch 20 .
FIG. 2 is a front photograph of the expanded expanded graphite layer 12 fixed to the substrate 10 after combustion of the non-combustible coating film 11 of FIG. 1 .
3 is a side photograph of the expanded expanded graphite layer 12 fixed to the substrate 10 of FIG. 2 , in which the non-combustible coating film 11 is foamed 100 to 300 times and adhered to the substrate 10 expanded expanded graphite layer 12 ) shows the thickness.

The present invention provides expanded graphite capable of maximizing flame retardant, heat-shielding, and heat-insulating effects by forming a graphite layer that expands and adheres without scattering when non-combustible coatings formed on various building materials, including the outer or inner walls of a building, are burned. It relates to a non-combustible coating composition containing The present invention also relates to a composition kit for preparing a non-combustible coating composition containing expanded graphite according to the present invention.

The nonflammable coating composition containing expanded graphite according to the present invention is characterized in that it comprises a water-soluble binder resin (A), expanded graphite (B), and an aqueous solution of a silane compound (C) to which a trace amount of acid is added.

(A) Water-soluble binder resin

The water-soluble binder resin binds the expanded graphite particles in the applied non-combustible coating film and serves as an adhesive. As the water-soluble binder resin, an acrylic resin, a polyol, or a mixture thereof may be used. As the polyol, polyester polyol or polyether polyol may be preferably used. The polyol preferably has a hydroxyl value of 130 to 340 mgKOH/g.

(B) Expanded graphite

Expanded graphite expands 100 to 300 times when heated to 150° C. or higher and has a particle size of 60 to 300 mesh, and a carbon component of 95 wt % or more is preferably used. In case of fire, it expands to form a graphite layer that is adhered to the substrate without scattering. You can purchase and use commercially available products. The reason that the expanded graphite is not scattering and forms a graphite layer fixed to the substrate even in a fire of 900° C. or higher is presumed to be due to the bonding of the expanded graphite with the silane compound. Because expanded graphite does not burn even at a temperature of 2,000℃ or higher, it has excellent insulation and heat dissipation effects.

(C) Aqueous solution of silane compound to which a trace amount of acid is added

The silane compound aqueous solution (C) to which a trace amount of acid is added is prepared by mixing the silane compound (C1) to which a trace amount of acid is added with water (C2). The silane compound acts as a gelling agent and an adhesive in the applied non-combustible coating film, and forms a graphite layer adhered to the substrate without scattering the expanded graphite by combining with the expanded graphite at a high temperature of 900° C. or higher.

Silane compounds include methyltrimethoxysilane (CH ₃ -Si-(OCH ₃ ) ₃ ), tetraethoxysilane (Si-(OC ₂ H ₅ ) ₄ ), glycidoxypropyltrimethoxysilane (CH ₂ (O) )CHCH ₂ OC ₃ H ₆ -Si-(OCH ₃ ) ₃ ), methacryloxypropyltrimethoxysilane (H ₂ C=CH(CH ₃ )C(O)OC ₃ H ₆ -Si-(OCH ₃ ) ₃ ), and vinyltrimethoxysilane (H ₂ C=CH-Si-(OCH ₃ ) ₃ ). Methyltrimethoxysilane (MTMS) can be preferably used. The silane compound can be used by purchasing a commercially available product. MTMS is marketed as XIAMETER® OFS-6070 Silane from Dow Corning, tetraethoxysilane (TES) is marketed as XIAMETER® OFS-6697 Silane from Dow Corning, vinyltrimethoxysilane (VTMS) is marketed as XIAMETER(R) OFS-6300 Silane from Dow Corning.

0.1 to 3.0 parts by weight of an acid is added to the silane compound, and examples of the added acid include acetic acid, hydrochloric acid, sulfuric acid, nitric acid, and the like. The silane compound to which 0.3 to 3.0 parts by weight of acid is added has good storage stability because it does not change or gel even after one year or more.

When water is mixed with the silane compound, it is gelled within several hours, so the process of preparing the silane compound aqueous solution (C) to which a trace amount of acid is added by mixing water with the silane compound to which a trace amount of acid has been added must be carried out at the work site.

Composition ratio and preparation:

The nonflammable coating composition of the present invention, which is composed of a mixture of a water-soluble binder resin, expanded graphite, and an aqueous solution of a silane compound to which a small amount of acid is added, gels within a few hours, at most within 1 to 2 hours due to the silane compound. This is because the silane compound acts as a gelling agent in the coating composition. Therefore, it must be applied before gelation.

The coating composition of the present invention cannot be distributed as a composition as it gels within a few hours. Therefore, in order to prepare the coating composition of the present invention, it should be provided as a composition kit. The composition kit for preparing the coating composition of the present invention consists of a mixture (I) in which expanded graphite (B) is mixed with a water-soluble binder resin (A), and a silane compound (II) to which a trace amount of acid is added. At the work site, an aqueous solution of a silane compound (C) (corresponding to III) to which a trace amount of acid is added by mixing silane compound (II) (corresponding to C1) and water (C2) in a weight ratio of 1:0.3-2.0 to which a trace amount of acid is added ) is manufactured.

The mixture (I) is a mixture of 100 parts by weight of a water-soluble binder resin and 30 to 70 parts by weight of expanded graphite. When 2 to 23 parts by weight of the silane compound aqueous solution (C) are mixed with 100 parts by weight of the mixture (I) and stirred, the coating composition of the present invention is prepared. When converted based on 100 parts by weight of the water-soluble binder resin (A), the coating composition contains 30 to 70 parts by weight of expanded graphite (B) and 3 to 30 parts by weight of an aqueous silane compound solution (C) to which a trace amount of acid is added.

In the method for preparing the silane compound aqueous solution (C), a silane compound to which a trace amount of acid is added and water are mixed in a weight ratio of about 1:0.3 to 2.0 and stirred for 30 minutes to 1 hour.

The coating composition of the present invention is prepared by mixing 2 to 23 parts by weight of the silane compound aqueous solution (C) (corresponding to III) to 100 parts by weight of the mixture (I) and stirring for 30 minutes to 1 hour.

The silane compound is hydrolyzed by water in the aqueous solution, the aqueous binder resin is also dissolved in the water, and the expanded graphite particles are homogeneously dispersed in the aqueous solution.

In the present invention, the silane compound is prepared by mixing the silane compound and water, but water may be mixed with the binder resin resin to be used. That is, the silane compound can be used by adding an acid without mixing water. In this case, there is a disadvantage that the reaction time is longer, but there is no major problem in the coating process.

Coating (forming a film):

The non-flammable coating composition of the present invention is applied 1 to 3 times to various building materials including insulation materials or to the inner and outer walls of buildings to form a 0.1 to 2.0 mm thick coating film. Various building materials such as iron, wood, plywood, paper, aluminum sheet (aluminum foil), fabric sheet, non-woven sheet, Styrofoam, urethane foam, PE foam, etc. may be applied as a substrate on which the coating film is formed. It is also possible to form a coating film imparting incombustibility or flame retardancy by applying it to the inner or outer walls of a building.

Since a coating film having a thickness of 0.1 to 2.0 mm is formed by applying 1 to 3 times to a substrate, it is possible to prevent detachment of the coating film due to its own load, and to provide a non-flammable coating composition having excellent incombustibility even when the coating film is formed thin.

The present invention will be further embodied by the following examples, which are presented for illustrative purposes only, and do not limit or limit the protection scope of the present invention.

Examples 1-6 and Comparative Examples 1-4: Composition and test results of coating compositions

According to the composition shown in Table 1, the coating compositions of Examples 1-9 and Comparative Examples 1-6 were prepared. As the water-soluble binder resin (A), an aqueous acrylic resin (A1) and a polyester polyol (A2) were used. As the expanded graphite (B), 95 wt% or more of the carbon component having a particle size of 200 mesh that expands by about 200 times when heated to 150° C. or higher was used. _{As a silane compound, methyltrimethoxysilane (CH 3} -Si-(OCH ₃ ) ₃ ), which is XIAMETER (registered trademark) OFS-6070 silane from Dow Corning, was used. 1.0 parts by weight of acid was added to the silane compound, and 100 parts by weight of water was added to 100 parts by weight of the silane compound to prepare an acid-added silane compound aqueous solution (C).

Combustion test:

The coating composition prepared in Examples 1-6 and Comparative Examples 1-4 was applied to the substrate once to form a non-combustible coating film. A 2mm-thick iron plate was used as the substrate. It was burned with a torch toward the coating film. 1 is a photograph of burning a non-combustible coating film 11 formed by applying a coating composition of Examples 1-6 to a substrate 10 once with a torch 20. Referring to FIG. 2 is a front photograph of the expanded expanded graphite layer 12 fixed to the substrate 10 after burning the non-combustible coating film 11 of FIG. 1 for 30 minutes. 3 is a side photograph of the expanded expanded graphite layer 12 fixed to the substrate 10 of FIG. 2 , in which the non-combustible coating film 11 is foamed 100 to 300 times and adhered to the substrate 10 expanded expanded graphite layer 12 ) shows the thickness.

The test results are shown in Table 1.

Coating film state: The state of the coating film formed after application was observed visually and by touch. In Examples 1-6 and Comparative Examples 1-4, it was found that the state of the coating film was excellent.

Coating thickness: The thickness of the coating film formed by applying the coating compositions prepared in Examples 1-6 and Comparative Examples 1-4 to a substrate once at a time was measured and shown in Table 1. It was applied once to form a relatively thin coating film of 1.0 mm or less.

Foam layer strength: After heating the coating films formed in Examples 1-6 and Comparative Examples 1-4 with a torch at 950 to 1,050° C. for 30 minutes, the strength of the foam layer was observed visually and by touch. In Example 1-6, it was found that the foamed layer had excellent strength, but in Comparative Examples 1-3, all of the expanded graphite was scattered and the foamed layer was not formed. In Comparative Example 4, most of the expanded graphite was scattered and a fine expanded graphite layer was observed.

Desorption of foamed layer during high-temperature fire resistance: In Examples 1-6, the foamed layer was adhered to the substrate, so that no detachment occurred, and in Comparative Examples 1-4, all of the expanded graphite was scattered and the foamed layer itself was not formed.

Back surface temperature after heating for 3 hours: After heating for 3 hours with a torch of 950 to 1,050° C. on the coating films formed in Examples 1-6 and Comparative Examples 1-4, the temperature of the back surface of the substrate was measured. In Example 1-6, the heating surface temperature was 950 to 1,050 °C, whereas the back surface temperature was maintained at 300 to 330 °C. Comparative Examples 1-4 maintain a slightly lower 750 ~ 910 ℃ than the heating surface temperature, it can be seen that there is almost no heat shielding and heat dissipation effect.

Simple modifications or changes of the present invention can be easily carried out by those of ordinary skill in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

Claims (14)

A non-combustible coating composition containing expanded graphite, comprising an aqueous solution of a silane compound to which a water-soluble binder resin, expanded graphite, and a trace amount of acid are added.
The non-combustible coating composition containing expanded graphite according to claim 1, wherein the water-soluble binder resin is an acrylic resin, a polyol, or a mixture thereof.
The non-combustible coating composition containing expanded graphite according to claim 2, wherein the polyol is a polyester polyol or a polyether polyol.
The non-combustible coating containing expanded graphite according to claim 2, wherein the expanded graphite expands 100 to 300 times when heated to 150° C. or higher, has a particle size of 60 to 300 mesh, and has a carbon component of 95% by weight or more. composition.
5. The method of claim 4, wherein the silane compound aqueous solution is a solution of a silane compound dissolved in water, and the silane compound is methyltrimethoxysilane (CH ₃ -Si-(OCH ₃ ) ₃ ), tetraethoxysilane (Si-( OC ₂ H ₅ ) ₄ ), glycidoxypropyltrimethoxysilane (CH ₂ (O)CHCH ₂ OC ₃ H ₆ -Si-(OCH ₃ ) ₃ ), methacryloxypropyltrimethoxysilane (H ₂ C =CH(CH ₃ )C(O)OC ₃ H ₆ -Si-(OCH ₃ ) ₃ ), and vinyltrimethoxysilane (H ₂ C=CH-Si-(OCH ₃ ) ₃ ) Incombustible coating composition containing expanded graphite, characterized in that at least one.
According to claim 1, wherein the non-flammable coating composition contains expanded graphite, characterized in that it comprises 100 parts by weight of a water-soluble binder resin, 30 to 70 parts by weight of expanded graphite, and 3 to 30 parts by weight of an aqueous solution of a silane compound to which a trace amount of acid is added. A non-flammable coating composition.
7. The expansion of claim 6, wherein the aqueous solution of the silane compound to which a trace amount of acid is added is a solution obtained by mixing a silane compound and water in a weight ratio of 1:0.3 to 2.0, and adding 0.3 to 3.0 parts by weight of an acid. A non-combustible coating composition containing graphite.
A mixture (I) in which expanded graphite is mixed with a water-soluble binder resin; and
silane compound (II) to which a trace amount of acid has been added;
Composition kit (kit) for producing a non-flammable coating composition, characterized in that consisting of.
According to claim 8, wherein the mixture (I) is composed of 100 parts by weight of a water-soluble binder resin and 30 to 70 parts by weight of expanded graphite, and the silane compound (II) to which a trace amount of acid is added is 100 parts by weight of the silane compound and 0.3 to 70 parts by weight of the acid. A composition kit for preparing a non-flammable coating composition, characterized in that it consists of 3.0 parts by weight.
The composition kit according to claim 9, wherein the water-soluble binder resin is an acrylic resin, a polyol, or a mixture thereof.
The composition kit according to claim 10, wherein the polyol is a polyester polyol or a polyether polyol.
12. The method of claim 11, wherein the expanded graphite expands 100 to 300 times when heated to 150° C. or higher, has a particle size of 60 to 300 mesh, and has a carbon component of 95% by weight or more. composition kit.
The method of claim 12, wherein the silane compound aqueous solution is a solution of a silane compound dissolved in water, and the silane compound is methyltrimethoxysilane (CH ₃ -Si-(OCH ₃ ) ₃ ), tetraethoxysilane (Si-( OC ₂ H ₅ ) ₄ ), glycidoxypropyltrimethoxysilane (CH ₂ (O)CHCH ₂ OC ₃ H ₆ -Si-(OCH ₃ ) ₃ ), methacryloxypropyltrimethoxysilane (H ₂ C =CH(CH ₃ )C(O)OC ₃ H ₆ -Si-(OCH ₃ ) ₃ ), and vinyltrimethoxysilane (H ₂ C=CH-Si-(OCH ₃ ) ₃ ) Composition kit for preparing a non-flammable coating composition, characterized in that at least one.
100 parts by weight of the mixture (I) according to any one of claims 8 to 13; and
2 to 23 parts by weight of an aqueous solution of a silane compound (III) to which a trace amount of acid is added by mixing the silane compound (II) to which a trace amount of acid is added and water in a weight ratio of 1:0.3 to 2.0;
A non-flammable coating composition, characterized in that it is prepared by mixing and stirring for 30 minutes to 1 hour.

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