JP3163414B2 - Composite refractory coating composition, composite refractory coating layer and method of forming the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a composition for a composite refractory coating, a composite refractory coating layer and a method for forming the same.

[0002]

2. Description of the Related Art Conventionally, in steel-framed buildings and civil engineering structures, a fire-resistant coating material is coated on the surface of a steel frame in order to prevent a decrease in the strength of the steel frame in the event of a fire. Foam-type refractory paints, which are one of such fire-resistant coating materials, are thin coating films before a fire, but due to the rise in temperature at the time of fire, the components in the coating film react to form a thick carbonized foam. Form a heat insulating layer. This foamed carbonized heat insulating layer delays the transfer of heat to the steel frame, and simultaneously extinguishes the non-combustible gas generated when foamed.

[0003] Since such a fire-resistant paint has a thinner coating film than a non-foaming type thick-film fire-resistant coating material, it may give a sense of oppression even in a part that is visible to human eyes. In addition, since the refractory coating layer is constructed, the amount of application is small due to the thinness.

[0004] Further, such a refractory paint does not require a conventional high-discharge-rate pumping device for applying a thick-film refractory coating material.
Since coating equipment for ordinary paints can be used, it is also expected to be a material excellent in workability, and is a material that is rapidly spreading at present depending on the work site.

[0005] By the way, the foam type refractory paint is required to be able to always exhibit excellent fire resistance performance in preparation for a fire that does not occur when it occurs. It is necessary to maintain constant quality over a long period of time. Therefore, in particular, when used for a part exposed to the outside air, the coating film is required to have excellent weather resistance.

[0006] However, these conventional fire-resistant paints are:
Flame retardants, foaming agents, etc. are included as essential components, but they are easily dissolved in water, so when used in places where there is much condensation even outdoors or indoors where the fire-resistant paint film is exposed to rainfall In such a case, there is a possibility that these components may be dissolved and the coating film may be deteriorated. For this reason, when a fire actually occurs, the reaction of the components that should form the foamed carbonized heat insulation layer is insufficient or does not occur at all, and the fire insulation and the like may not be sufficiently exhibited.

[0007] Further, in both the outdoor and indoor areas that are exposed to the sun's rays, the constituent components are deteriorated by ultraviolet rays, and defects such as chalking or swelling and peeling of the coating film occur.

In this connection, a method of laminating a coating film having good water resistance and weather resistance as a coating material on a coating film of a fire-resistant coating material is also known. Due to insufficient adhesion to the material, it is difficult to maintain the inherent fire resistance of the fire-resistant paint film over a long period of time even in this method.

[0009]

Accordingly, an object of the present invention is to provide a composite fire-resistant coating layer having excellent long-term weather resistance.

[0010]

Means for Solving the Problems The present inventor has made extensive studies in view of the above problems, and as a result, it has been found that a coating film formed from a refractory paint having a specific composition has a good adhesion to a certain top coating material. As a result, they have found that a coating film having excellent long-term weather resistance can be provided, and have completed the present invention.

That is, the present invention relates to the following composite refractory coating composition, composite refractory coating layer and a method for forming the same.

1. At least one decomposable blowing agent comprising a vinyl thermoplastic synthetic resin, a petroleum resin, a phosphorus-based flame retardant, a melamine compound, a triazine-based compound, an N-nitroso compound, an azo compound, a sulfonhydrazide compound and a derivative thereof; A composition for forming a composite refractory coating layer, comprising a polyhydric alcohol-based carbonized layer-forming agent and a chlorine-based plasticizer.

2. A method for forming a composite fire-resistant coating layer, comprising forming a fire-resistant coating layer comprising the composition described in 1 above on an object to be coated, and further applying an overcoat material on the fire-resistant coating layer.

3. 4. The forming method according to the above item 3, wherein the overcoating material is mainly composed of a silicon-modified acrylic resin or a fluorine urethane resin.

4. A composite refractory coating layer formed by the method described in 2 or 3 above.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail along with its embodiments.

The vinyl thermoplastic synthetic resin serves as a base for dispersing the other components of the composition for forming the composite fire-resistant coating layer, and serves to maintain the composition for forming the composite fire-resistant coating layer in a layered state. It becomes the main material for film formation.

The vinyl-based thermoplastic synthetic resin is not particularly limited as long as it has the above-mentioned functions. For example, polyvinyl chloride, polyethylene, ethylene-vinyl acetate synthetic resin, vinyl acetate-veova synthetic resin, vinyl toluene butadiene, vinyl toluene Acrylate, vinyl toluene methacrylate and the like can be mentioned, and these can be used alone or in combination of two or more.

Of these, vinyl toluene-based compounds such as vinyl toluene butadiene, vinyl toluene acrylate and vinyl toluene methacrylate are preferred, and vinyl toluene butadiene and vinyl toluene acrylate are more preferred.

The molecular weight of the vinyl thermoplastic synthetic resin is not particularly limited, but is usually from 50,000 to 500,000.
It may be about 200,000.

Known petroleum resins can be used as they are, and commercially available petroleum resins can also be used. The types of petroleum resins, such as ethylene by steam cracking of petroleum, among the decomposable fraction by-produced from ethylene plants for producing propylene and the like, aliphatic which the C ₅ fraction and starting material (C ₅ series) petroleum Resin, aromatic (C ₉ ) petroleum resin using C ₉ fraction as raw material, aliphatic / aromatic copolymer (C ₅ C ₉ ) petroleum resin using both as raw materials, high-purity dicyclopentadiene And alicyclic (DCPD) petroleum resins and the like. These petroleum resins may be used alone or in combination of two or more. Among these petroleum resins, it is desirable to use an alicyclic (DCPD) petroleum resin because of its excellent weather resistance and good adhesion to the topcoat material.

By incorporating a petroleum resin, excellent adhesion and weather resistance can be obtained, especially when an overcoating material having excellent weather resistance is formed on the surface of the fire-resistant coating layer formed from the composition for forming a composite fire-resistant coating layer. Demonstrate the nature.

The blending amount (solid content) of the petroleum resin may be appropriately changed according to the type of the vinyl thermoplastic synthetic resin to be used, the type of the petroleum resin to be used, the application site of the coating film, and the like.
Usually, about 10 to 60 parts by weight, preferably 15 to 60 parts by weight, based on 100 parts by weight of the solid content of the vinyl thermoplastic synthetic resin.
45 parts by weight. If the amount is less than 10 parts by weight, the adhesion to the overcoating material having excellent weather resistance may be insufficient,
If the amount exceeds 60 parts by weight, combustion of the foamed carbonized heat insulating layer may occur.

The phosphorus-based flame retardant mainly suppresses or prevents combustion of the foamed carbonized heat-insulating layer by a flame-retardant effect, and the type thereof is not particularly limited as long as it has this effect. For example, tricresyl phosphate, diphenylcresyl phosphate, diphenyloctyl phosphate, tri (β-chloroethyl) phosphate, tributyl phosphate, tri (dichloropropyl) phosphate, triphenyl phosphate, tri (dibromopropyl) phosphate, chlorophosphonate, bromophosphonate Organic phosphorus compounds such as diethyl-N, N-bis (2-hydroxyethyl) aminomethylphosphate, di (polyoxyethylene) hydroxymethylphosphonate, chlorides such as phosphorus trichloride and phosphorus pentachloride, ammonium phosphate, And phosphoric acid compounds such as ammonium polyphosphate. One or more of these flame retardants may be used. Among them, in particular, ammonium polyphosphate is used because it has both the dehydration cooling function and the incombustible gas generation function, and thus has an excellent flame retardancy, and also has an advantage that the amount of a foaming agent described below can be reduced. Is preferred.

The amount of the phosphorus-based flame retardant may be appropriately determined depending on the kind of the flame retardant, etc., and is usually 20 parts by weight per 100 parts by weight of the solid content of the vinyl thermoplastic synthetic resin.
The amount may be about 0 to 600 parts by weight, preferably 300 to 500 parts by weight. If the amount is less than 200 parts by weight, the expansion ratio may be low, and the fire resistance may not be exhibited.
If the amount is more than 600 parts by weight, the strength of the foamed carbonized heat insulation layer becomes low, and the steel frame cannot be sufficiently protected. The foaming agent is
It decomposes with an increase in temperature to generate nonflammable gas, and forms a polyhydric alcohol carbide described later in a foamed porous form. As these foaming agents, known ones can be used as long as they have such a foaming action.
For example, melamine compounds such as melamine, triazine compounds such as trihydrazinotriazine, N-nitroso compounds such as dinitrosopentamethylenetetramine, N, N-dinitroso-N, N-dimethylterephthalamide, azobisisobutyronitrile And azo compounds such as azodicarbonamide, benzenesulfonyl hydrazide, p-toluenesulfonyl hydrazide, and sulfone hydrazide compounds such as p, p-oxy-bis (benzenesulfonyl hydrazide), and derivatives thereof. These may be used alone or in combination of two or more. Among these, melamine, trihydrazinotriazine, and the like are desirable from the viewpoints of foaming initiation temperature, handling, and availability.

The amount of the foaming agent may be determined depending on the type of the foaming agent to be used, the application site of the coating film, and the like. Usually, 40 parts by weight based on 100 parts by weight of the solid content of the vinyl thermoplastic synthetic resin described above. About 120 parts by weight, preferably 60 to 9 parts by weight
It may be 0 parts by weight. If the amount is less than 40 parts by weight, cavities may be generated in the foamed carbonized heat insulating layer. Also, 120
When the amount exceeds the weight part, the expansion ratio becomes low.

The polyhydric alcohol-based carbonized layer forming agent is mainly carbonized with an increase in temperature and forms a foamed porous material of a carbide by the effect of the foaming agent. The polyhydric alcohol-based carbonized layer forming agent is not particularly limited as long as it has the above-mentioned action, and examples thereof include starch, casein, pentaerythritol, dipentaerythritol, and trimethylpropane. Among them, dipentaerythritol and the like are preferable. One or more of these polyhydric alcohol-based carbonized layer forming agents may be used.

The blending amount of the polyhydric alcohol-based carbonized layer forming agent can be appropriately changed depending on the use site of the coating film, etc., but usually, the solid content of the vinyl thermoplastic synthetic resin is 1%.
The amount may be about 40 to 120 parts by weight, preferably 60 to 90 parts by weight, based on 00 parts by weight.

The chlorine-based plasticizer is blended especially for improving the toughness of the formed composite fire-resistant coating layer, and the type thereof is not particularly limited as long as it has such properties. For example, chlorinated plasticizers such as chlorinated paraffins, chlorinated polyolefins, and chlorinated aliphatic esters can be used. These chlorine plasticizers
A single type or a combination of two or more types may be used. Among these chlorine plasticizers, it is preferable to use chlorinated paraffin.

The amount of the chlorine-based plasticizer may be appropriately set according to the site to be used, but is usually 50 to 1 based on 100 parts by weight of the solid content of the vinyl thermoplastic synthetic resin.
It may be about 70 parts by weight, preferably 70 to 130 parts by weight. If the amount is less than 50 parts by weight, the foaming becomes insufficient, and if it exceeds 170 parts by weight, the coating film tends to be too soft.

The composition of the present invention may contain, in addition to these components, titanium dioxide, talc, calcium carbonate, sodium carbonate, zinc oxide, clay, clay, shirasu, and the like, if necessary, as long as the effects of the present invention are not reduced. Mica, glass fiber,
Fillers such as glass flakes, quartz sand, cold water stones, benzene,
Solvents (diluting solvents) such as toluene, xylene, mineral spirit, methyl ethyl ketone and methyl isobutyl ketone; drying regulators such as ethylene glycol; viscosity modifiers such as organic bentonite, amide wax and castor oil;
Various additives such as an antifoaming agent such as silicone oil can also be blended.

The composition of the composition of the present invention is not particularly limited as long as the above components can be uniformly mixed. In particular, a decomposable foaming agent and a polyhydric alcohol-based carbon layer forming agent are mixed with a vinyl thermoplastic synthetic resin. After that, it is desirable to mix the petroleum resin and the diluting solvent, and then mix the chlorine-based plasticizer.

Specifically, for example, a vinyl-based thermoplastic synthetic resin is put into a mixing and stirring tank, and a decomposable foaming agent and a polyhydric alcohol-based carbonized layer forming agent are blended while mixing and stirring with a dissolver or the like. After the dispersion, the petroleum resin and the diluting solvent are mixed, and then the chlorine-based plasticizer is mixed. By such a method, the fluidity of the petroleum resin can be effectively used to reduce the amount of the solvent to be mixed.

The composite fire-resistant coating layer of the present invention is applied to a coating material such as a steel frame, on the surface of the fire-resistant coating layer formed from the composition for forming a composite fire-resistant coating layer described above, and further to a coating material having excellent long-term weather resistance. Is formed.

The above-mentioned fire-resistant coating layer is obtained by applying the composition by a known coating method such as brushing, spraying, roller or the like, and drying. The thickness of the coating film may be appropriately determined according to the site to be used, the type and shape of the object to be coated, and the like, but is usually about 0.3 to 3 mm. However, the composition of the present invention can be applied in a thickness of 3 mm or more depending on the composition.

The object to be coated is not particularly limited.
The present invention can be applied to virtually any material such as a metal material such as iron, stainless steel, and aluminum, a material obtained by subjecting a metal to a metal plating treatment such as zinc plating, an inorganic hardened material such as concrete and mortar, and other plastics and wood.

As a top coating material having excellent long-term weather resistance, JIS
A 6909-1995 "Architectural finishing coating material" 6.20 Weather resistance test The weather resistance test is not particularly limited as long as it has one to three types of performance in Method B, for example, silicon-modified acrylic resin,
Those containing a fluorine-containing urethane resin as a main component are desirable in that the coating film is less likely to be contaminated.

[0038]

According to the composition of the present invention, since it is composed of a specific composition containing a petroleum resin, its refractory coating layer has excellent adhesion to a topcoat material, and is used as a refractory paint having fire resistance and heat insulation properties. Can maintain its original function for a long time.

The refractory coating layer hardly generates cracks due to drying shrinkage, and can be formed with a thickness of several mm.

Furthermore, the composition of the present invention is excellent in thixotropic properties, and the coating film does not sag even when sprayed thickly, and can be thickly applied to virtually any site. Also,
Even during pumping, it exhibits a viscosity that facilitates pumping, and is excellent in handleability and workability.

The composition of the present invention having such characteristics is useful mainly in the field of fire-resistant coating materials for civil engineering and architectural structures, which prevent a decrease in the strength of the structure due to a rise in temperature when a fire occurs.

[0042]

EXAMPLES Examples and comparative examples are shown below to further clarify the features of the present invention. The test method in this example is as follows.

Fire Resistance Performance Test JIS K 1304 “Fire Resistance Test Method for Building Structure” “4.
Based on the standard heating curve prescribed in “Heating grade; attached drawing”, one surface of the test piece was heated and heated in an electric furnace, and the elapsed time (minute) when the back surface temperature of the hot-rolled steel sheet reached 600 ° C. ). Further, for the test piece, the measurement of the expansion ratio with respect to the dried coating film and the state (appearance) of the foamed layer were evaluated.

Test for Physical Properties of Coating Film Each test piece was subjected to 9.8 of JIS K 5400 “General Test Methods for Paints”.
After performing an acceleration test for 350 hours using a sunshine carbon arc lamp type weather resistance tester specified in "Accelerated weather resistance test", the state of the coating film on the surface of the test piece was evaluated by visual observation.

Subsequently, the test specimen after the test was subjected to a 10-cycle test based on “9.4“ Wet resistance repeatability ”” of JIS K 5400 “General Paint Test Method”. The contents of one cycle were as follows: fresh water at 20 ° C. for 18 hours, standing at 20 ° C. in air for 3 hours, and standing at 50 ° C. in air for 3 hours. After conducting the test in this way, the state of the coating film on the surface of the test piece was evaluated by visual observation. The evaluation method of these tests is described in "Coating Film Evaluation Criteria (1970)" issued by the Japan Paint Inspection Association.
The evaluation was performed based on the “evaluation of blistering” and “our evaluation”.

Comprehensive Evaluation Those that can be used as a composite refractory coating layer having excellent long-term weather resistance are indicated by ○, and those that cannot be used are indicated by x.

Example 1 A vinyl toluene acrylate resin solution as a vinyl-based thermoplastic resin was added to a mixing and stirring tank at a solid content of 100%.
Parts by weight, 80 parts by weight of melamine as a foaming agent, 85 parts by weight of dipentaerythritol as a carbonized layer forming agent, and 120 parts by weight of titanium dioxide as a filler were mixed and stirred with a dissolver and uniformly dispersed. . Further, 40 parts by weight of an alicyclic hydrocarbon-based petroleum resin and 300 parts by weight of a diluting solvent (xylene) are charged and thoroughly mixed until uniform, and then 400 parts by weight of ammonium polyphosphate is added. Chlorinated paraffin 9 as
0 parts by weight were added and mixed to obtain a composite refractory coating composition.
In addition, the raw materials used and the composition thereof are also shown in Tables 1 and 2.

The above composition was prepared in a size of 300 mm × 300 mm × 9 mm
As hot rolled steel sheet substrate (A) and 150mm × 300mm × 2.3mm (B) , and spray coated with the respective spray as coating weight 3.0 kg / m ^2, and dried aged 5 days. Furthermore, silicone-modified acrylic resin paint ( "elastic Lyrica tight enamel" Esuke_kaken Ltd.) was coated at a coverage of 0.12 kg / m ² as a top coat material, and 1 week dry curing.

The test piece A obtained was subjected to a fire resistance test and the test piece B was subjected to a coating film physical property test. Table 4 shows the results.

As a result of the above, the coating layer obtained above has excellent adhesion to the topcoat material, so that it does not cause blistering or cracking, and there is no abnormality in the state of the foamed carbonized heat insulating layer even in fire resistance. The foaming ratio was high and the fire resistance time was 65 minutes, showing excellent performance.

Examples 2 to 3 The raw materials shown in Table 1 were used and the formulations shown in Table 2 were used.
In the same manner as in Example 1, a composition for forming a composite refractory coating layer was produced, a coating layer was formed, and each test was performed. Table 4 shows the results. As shown in Table 4, the obtained coating layer was excellent in long-term weather resistance and exhibited excellent fire resistance performance as in the case of Example 1.

Examples 4 to 6 Except that the raw materials shown in Table 1 were used and the formulations shown in Table 2 were used,
In the same manner as in Example 1, a composition for forming a composite refractory coating layer was produced.

Next, a coating film was prepared in the same manner as in Example 1 except that a fluorine urethane resin-based coating material ("Elastic Fussolon" manufactured by SK Chemical Co., Ltd.) was used as the top coating material (coating amount: 0.12 kg / m ² ). Layer obtained.

The same test as in Example 1 was performed on the obtained coating layer. Table 4 shows the results. As shown in Table 4, the obtained coating layer was excellent in long-term weather resistance and exhibited excellent fire resistance performance as in the case of Example 1.

Comparative Example 1 The raw materials shown in Table 1 were used and the formulations shown in Table 3 were used.
A composition was produced in the same manner as in Example 1, a coating layer was formed, and each test was performed. Table 5 shows the results. As shown in Table 5, since the obtained coating layer did not contain petroleum resin, the swelling of the coating film was 4 mm or more (average diameter) in the coating film physical property test, and the total area of blisters was increased. Was 0.5% or less of 8-VL, which proved that the long-term weather resistance was insufficient.

Comparative Example 2 The raw materials shown in Table 1 were used, and the formulations shown in Table 3 were used.
A composition was produced in the same manner as in Example 1, a coating layer was formed, and each test was performed. Table 5 shows the results. As shown in Table 5, although there was no particular problem in the coating film physical property test, since only a non-vinyl-based styrene-alkyl methacrylate-alkyl acrylate copolymer resin was used, It was found that the product fell off and the fire resistance was poor.

Comparative Example 3 The raw materials shown in Table 1 were used, and the blending shown in Table 3 was used.
A composition was produced in the same manner as in Example 1, a coating layer was formed, and each test was performed. Table 5 shows the results. As shown in Table 5, since the petroleum resin alone was used without using the vinyl-based thermoplastic resin, the size of the blister of the coating film was 4 mm or more (average diameter) in the coating film physical property test. The evaluation was 2-VL in which the area was 11 to 30% of the whole, and it was found that the long-term weather resistance was insufficient. In addition, combustion ashing of the foamed carbonized layer was observed, and the fire resistance was also insufficient.

Comparative Example 4 Except that the raw materials shown in Table 1 were used and the formulations shown in Table 3 were used,
A composition was produced in the same manner as in Example 1, a coating layer was formed, and each test was performed. Table 5 shows the results. As shown in Table 5, since no petroleum resin was blended, the size of the blister of the coating film was 4 mm or more (average diameter) in the coating film physical property test, and the total area of blisters was 0.5% of the whole. The following 8-VL was evaluated, and it was found that the long-term weather resistance was insufficient. In addition, a reduction in the fire resistance time, a reduction in the expansion ratio of the expanded carbonized layer, and the like were observed, and the fire resistance was also insufficient.

Comparative Example 5 Except that the raw materials shown in Table 1 were used and the formulations shown in Table 3 were used,
A composition was produced in the same manner as in Example 1, a coating layer was formed, and each test was performed. Table 5 shows the results. As shown in Table 5, although there was no particular problem in the coating film physical properties test, since a non-vinyl styrene-alkyl methacrylate-alkyl acrylate copolymer resin was used in combination with a petroleum resin, It was found that the product fell off and the fire resistance was poor.

COMPARATIVE EXAMPLE 6 Except that the raw materials shown in Table 1 were used and the formulations shown in Table 3 were used,
A composition was produced in the same manner as in Example 1, a coating layer was formed, and each test was performed. Table 5 shows the results. As shown in Table 5, the amount of petroleum resin was small, so that the size of the blister of the coating film was 0.2 to 0.5 mm in the coating film physical property test.
(Average diameter) and the total area of swelling is 0.5
% Or less, which indicates that the long-term weather resistance is insufficient.

Comparative Example 7 Except that the raw materials shown in Table 1 were used and the formulations shown in Table 3 were used,
A composition was produced in the same manner as in Example 1, a coating layer was formed, and each test was performed. Table 5 shows the results. As shown in Table 5, since the compounding amount of the petroleum resin was large, the foamed carbonized layer fell off, and it was found that the fire resistance was poor.

[0062]

[Table 1]

[0063]

[Table 2]

[0064]

[Table 3]

[0065]

[Table 4]

[0066]

[Table 5]

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Motoki 1-25-10 Shimizu, Ibaraki-shi, Osaka SK Kaken Co., Ltd. Research Laboratory (72) Inventor Tomio Ouchi 2--19, Tobita Tobita, Chofu-shi, Tokyo No. 1 Kashima Construction Co., Ltd. Technical Research Institute (72) Inventor Keiichi Miyamoto 2-19-1, Tobita-Ki, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (56) References JP-A-51-86569 (JP) JP-A-53-110639 (JP, A) JP-A-4-117467 (JP, A) JP-A-57-177073 (JP, A) JP-B-34-10932 (JP, B1) 4-504135 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) C09D 1/00-201/10

Claims (10)

(57) [Claims] 1. One or more vinyl thermoplastic synthetic resins comprising polyvinyl chloride, polyethylene, ethylene-vinyl acetate synthetic resin, vinyl acetate-veova synthetic resin, vinyl toluene butadiene, vinyl toluene acrylate and vinyl toluene methacrylate. (Solid content) 1
100 parts by weight, 10-60 parts by weight of petroleum resin,
200 to 600 parts by weight of a phosphorus-based flame retardant, 40 to 120 parts by weight of at least one decomposable foaming agent comprising a melamine-based compound, a triazine-based compound, an N-nitroso compound, an azo compound, a sulfone hydrazide compound and a derivative thereof, A composition for forming a composite refractory coating layer, comprising 40 to 120 parts by weight of a polyhydric alcohol-based carbonized layer-forming agent and 50 to 170 parts by weight of a chlorine-based plasticizer. 2. The composition according to claim 1, wherein the vinyl-based thermoplastic synthetic resin is a vinyl-toluene-based synthetic resin composed of vinyltoluenebutadiene, vinyltoluene acrylate and vinyltoluene methacrylate, alone or in combination. 3. A composite fire-resistant coating layer comprising: forming a fire-resistant coating layer comprising the composition according to claim 1 on an object to be coated; and further applying a topcoat material on the fire-resistant coating layer. Formation method. 4. The overcoating material is mainly composed of a silicon-modified acrylic resin or a fluorine urethane resin.
The forming method as described above. 5. A composite fire-resistant coating layer formed by the method according to claim 3. 6. An alicyclic hydrocarbon-based petroleum resin (solid) based on 100 parts by weight of a vinyltoluene-based synthetic resin comprising vinyltoluenebutadiene, vinyltoluene acrylate and vinyltoluene methacrylate alone or in combination of two or more (solid content). Min) for forming a composite refractory coating layer containing 10 to 60 parts by weight, 200 to 600 parts by weight of ammonium polyphosphate, 40 to 120 parts by weight of melamine, 40 to 120 parts by weight of dipentaerythritol and 50 to 170 parts by weight of chlorinated paraffin Composition. 7. A method for forming a composite fire-resistant coating layer, comprising: forming a fire-resistant coating layer comprising the composition according to claim 6 on an object to be coated; and further applying an overcoating material on the fire-resistant coating layer. . 8. The overcoating material is mainly composed of a silicon-modified acrylic resin or a fluorine urethane resin.
The forming method as described above. 9. A composite fire-resistant coating layer formed by the method according to claim 7. 10. A vinyl thermoplastic synthetic resin consisting of polyvinyl chloride, polyethylene, ethylene-vinyl acetate synthetic resin, vinyl acetate-veova synthetic resin, vinyl toluene butadiene, vinyl toluene acrylate and vinyl toluene methacrylate, alone or in combination of two or more. (Solid content) 1
After mixing 40 to 120 parts by weight of a decomposable foaming agent and 40 to 120 parts by weight of a polyhydric alcohol-based carbonized layer forming agent with 00 parts by weight, 10 to 60 parts by weight of a petroleum resin and a diluting solvent are mixed. A method for producing a composition for forming a composite refractory coating layer, comprising mixing 200 to 600 parts by weight of a flame retardant and further mixing 50 to 170 parts by weight of a chlorine-based plasticizer.