JP7026523B2 - Dressing - Google Patents

Description

The present invention relates to a novel covering material.

For the purpose of protecting a base material such as a steel material, concrete, wood, or synthetic resin from a fire, various covering materials have been proposed which are foamed by a temperature rise at the time of a fire or the like to form a carbonized heat insulating layer. As such a coating material, a synthetic resin mixed with a foaming agent, a carbonizing agent, a flame retardant, or the like is known.

For example, Patent Document 1 describes that by using a specific flame retardant, it is possible to satisfactorily retain the carbonized layer and effectively insulate it. Further, Patent Document 2 describes that the inclusion of the organic binder and the thermosetting inorganic binder is excellent in adhesion to the steel material, uniformity of the coating film after foaming, strength and the like.

Japanese Unexamined Patent Publication No. 10-7947 Japanese Unexamined Patent Publication No. 10-110121

However, even with the covering materials of Patent Document 1 and Patent Document 2, there are cases where sufficient foamability cannot be obtained, and problems such as ashing and shrinkage of the carbonized heat insulating layer (foamed layer) occur, so that the carbonized heat insulating layer is used. It may not be possible to form it stably, and there is still room for improvement in order to obtain sufficient heat-resistant protection performance.

In order to solve such a problem, the present inventors include a binder and a fire resistance-imparting powder for a coating material in which the coating material forms a carbonized heat insulating layer due to a temperature rise in the event of a fire or the like, and fluorine in the coating material. It has been found that the above-mentioned problems can be solved and the heat-resistant protection performance of the base material can be enhanced by the content being a specific amount, and the present invention has been completed.

That is, the present invention has the following features.
1. 1. The coating is a coating material that forms a carbonized heat insulating layer by increasing the temperature.
The coating material is a foamable refractory coating material that forms a carbonized heat insulating layer when the coating surface temperature is 200 ° C. or higher.
The coating material contains a resin component and a refractory-imparting powder.
The refractory-imparting powder contains a foaming agent, a carbonizing agent, a flame retardant, and a filler.
A coating material having a fluorine content of 10 to 150 mg / kg.
2. 2. The coating material is characterized by containing a fluorine-containing resin as a resin component. The covering material described in.

The present invention is a coating material in which the coating material forms a carbonized heat insulating layer by increasing the temperature, and the coating material contains a resin component and a fire-resistant powder, and the fluorine content of the coating material is in a specific range. As a result, it has excellent foaming properties when the temperature rises due to a fire, etc., and suppresses ashing and shrinkage of the carbonized heat insulating layer to form a stable carbonized heat insulating layer and enhances the heat resistance of the base material. Can be done.

Hereinafter, the present invention will be described in detail based on the embodiments thereof.

The coating material of the present invention forms a carbonized heat insulating layer due to a temperature rise (heating) due to a fire or the like, and the coating material contains a resin component and a fire-resistant powder as essential components, and the coating material thereof. It forms a fluorine-containing film having a fluorine content of 10 to 150 mg / kg (preferably 15 to 110 mg / kg, more preferably 20 to 100 mg / kg). In the present invention, "a to b" are synonymous with "a or more and b or less".

In the present invention, when the fluorine content in the coating film satisfies the above range, the coating film has excellent foamability due to an increase in the temperature of the coating film (preferably, the coating film surface temperature is 200 ° C. or higher, more preferably 250 ° C. or higher). It is possible to suppress ashing and shrinkage of the carbonized heat insulating layer to form a stable carbonized heat insulating layer and enhance the heat resistance of the base material. When the fluorine content in the film is equal to or higher than the above lower limit, the carbonized heat insulating layer is incinerated due to the temperature rise of the carbonized heat insulating layer (specifically, when the surface temperature of the carbonized heat insulating layer exceeds 400 ° C.). Progression can be suppressed. On the other hand, when the fluorine content is not more than the above upper limit, sufficient foamability can be obtained and the above effect can be enhanced. In particular, the above effect can be further enhanced at high temperatures. Further, in addition to the above effects, the fluidity of the covering material is increased, and the coating workability, moldability and the like can be improved. Further, the formed film can exhibit excellent effects in water resistance, weather resistance, stain resistance, light reflection property, aesthetics and the like, in addition to heat resistance protection.

In the present invention, the fluorine content is a value measured by a combustion ion chromatography method. Specifically, the coating material of the present invention is applied onto a release paper, and the film dried under a standard state (temperature 23 ° C., relative humidity 50%) is crushed and 20 mg is collected as a sample. Next, using an automatic sample combustion device (“AQF-100” manufactured by Mitsubishi Chemical Analytech Co., Ltd.), the sample was heated under the conditions of 1000 ° C. and 10 minutes under an atmosphere of argon and oxygen, and the amount of fluorine generated was determined. It can be determined by quantification using an ion chromatograph (“ICS-1600” manufactured by Thermo Fisher Scientific Co., Ltd.).

The coating material forming such a fluorine-containing film can be obtained, for example, by the following aspects (1) and / or (2).
(1) Fluorine-containing resin is contained as the resin component (A).
(2) Fluorine compound (B) (excluding fluorine-containing resin) is contained.

The above (1) is not particularly limited as long as it contains a fluorine-containing resin as the resin component (A), and an embodiment containing only a fluorine-containing resin or a mode in which a fluorine-containing resin and another synthetic resin are mixed is also used. can. In the coating material of the present invention, an embodiment in which a fluorine-containing resin and a synthetic resin other than the fluorine-containing resin are mixed is preferable. Thereby, the effect of the present invention can be sufficiently obtained.

Examples of the fluorine-containing resin in (1) above include water-based resins such as water-dispersible type and water-soluble type, solvent-based resins such as solvent-soluble type resin and non-water-soluble type resin, and powder resins (bead-shaped, It may be in the form of pellets), or it may be an embodiment in which various curing agents (crosslinking agents), curing catalysts and the like are used. In the present invention, as the resin component (A), a powder resin is suitable as an embodiment of the fluorine-containing resin when the fluorine-containing resin is mixed with other synthetic resins and used.

Examples of the fluorine-containing resin of the present invention include a single or copolymer of a fluorine-containing monomer; a copolymer of a fluorine-containing monomer and another polymerizable monomer.
Examples of the fluorine-containing monomer include fluoroolefin monomers and fluoroalkyl group-containing acrylic monomers. Examples of the fluoroolefin monomer include perfluoroolefins such as tetrafluoroethylene, chlorotrifluoroethylene and hexafluoropropylene, vinyl fluoride and vinylidene fluoride. Examples of the fluoroalkyl group-containing acrylic monomer include perfluoromethylmethacrylate, perfluoroisononylmethylmethacrylate, 2-perfluorooctylethyl acrylate, 2-perfluorooctylethyl methacrylate, trifluoroethyl acrylate and the like. These can be used in one type or two or more types.

Examples of the other polymerizable monomer include methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, and n-amyl (meth) acrylate. , Isoamyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, octadecyl (meth) acrylate, cyclohexyl (meth) ) (Meth) acrylic acid alkyl esters such as acrylates; hydroxyalkyl vinyl ethers such as hydroxyethyl vinyl ethers, hydroxypropyl vinyl ethers, hydroxybutyl vinyl ethers, hydroxypentyl vinyl ethers; ethylene glycol monoallyl ethers, diethylene glycol monoallyl ethers, triethylene glycol monoallyl ethers. Hydroxylaryl ethers such as 2-hydroxyethyl (meth) acrylates, hydroxypropyl (meth) acrylates, 4-hydroxyethyl (meth) acrylates, hydroxyl group-containing (meth) acrylates such as 4-hydroxybutyl (meth) acrylates; dimethylamino Amino group-containing monomers such as ethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, dimethylamino (meth) acrylate, aminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate; acrylic acid, methacrylic acid, crotonic acid, Carboxyl group-containing monomers such as maleic acid or its monoalkyl ester, itaconic acid or its monoalkyl ester, fumaric acid or its monoalkyl ester; amide-containing monomers such as (meth) acrylamide, ethyl (meth) acrylamide; (meth) acrylonitrile Nitrile group-containing monomers such as; epoxy group-containing monomers such as glycidyl (meth) acrylate; aromatic vinyl monomers such as styrene, methylstyrene, chlorostyrene, vinyltoluene; vinyl acetate, vinyl propionate, vinyl butyrate, vinyl pivalate, etc. Vinyl ester; Examples thereof include olefin-based monomers such as ethylene and propylene, and one or more of these can be used as required.

Specific examples of such a fluorine-containing resin include homopolymers such as polyvinylfluoride, polyvinylidene fluoride, polytrifluoroethylene, polychlorotrifluoroethylene, and polytetrafluoroethylene; tetrafluoroethylene-hexafluoro. Examples thereof include polymers such as propylene copolymers, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymers, ethylene-tetrafluoroethylene copolymers, and ethylene-chlorotrifluoroethylene copolymers. The fluorine-containing resin can be used alone or in combination of two or more.

Further, as the fluorine-containing resin of the present invention, an acrylic composite fluorine-containing resin is suitable. When the fluorine-containing resin has an acrylic (composite) portion, compatibility and dispersibility with resin components other than the fluorine-containing resin are enhanced, and the effect of the present invention can be enhanced. As such an acrylic composite fluorine-containing resin, for example, a mixture and / or a reaction product of an acrylic resin and a fluorine-containing resin can be used, and in particular, powdered acrylic composite polytetrafluoroethylene has dispersibility in a coating film. The effect of the invention can be further enhanced.

The acrylic resin is a resin containing a (meth) acrylic acid alkyl ester as a constituent component, and is, for example, a (meth) acrylic acid alkyl ester and, if necessary, the above-mentioned "other polymerizable monomer" ((meth) acrylic acid). Excluding alkyl esters. For example, a copolymer obtained by polymerizing an aromatic vinyl monomer such as styrene or a vinyl ester such as vinyl acetate monomer) can be used. The content of the acrylic resin in the acrylic composite polytetrafluoroethylene is preferably 10 to 90% by weight (more preferably 20 to 80% by weight). In such a case, excellent dispersibility can be exhibited and the effect of the present invention can be sufficiently exhibited.

The method for producing the acrylic composite polytetrafluoroethylene is not particularly limited as long as it is a known method, and for example, a method obtained by mixing a polytetrafluoroethylene particle dispersion and an acrylic resin dispersion and coagulating or spray-drying. A method of polymerizing the above (meth) acrylic acid alkyl ester or the like in the presence of a polytetrafluoroethylene particle dispersion and obtaining it by coagulation or spray drying. The existence of a latex in which a polytetrafluoroethylene particle dispersion and an acrylic resin dispersion are mixed. Examples thereof include a method of polymerizing the above (meth) acrylic acid alkyl ester and the like and obtaining them by coagulation or spray drying.

As the synthetic resin other than the fluorine-containing resin, either a thermoplastic resin or a thermosetting resin may be used, and known ones can be used. Examples thereof include NAD type, solvent-soluble type, solvent-free type, and powder resin (including beads and pellets), and one-component type, two-component type and the like can be used without particular limitation. Specifically, examples of the thermosetting resin include epoxy resin, urethane resin, alkyd resin, phenol resin, melamine resin and the like. Examples of the thermoplastic resin include polyester resin, polybutadiene resin, acrylic resin, styrene resin, acrylic styrene resin, vinyl acetate resin, vinyl acetate / versatic acid vinyl ester copolymer resin, vinyl acetate / ethylene copolymer resin, vinyl acetate / Examples thereof include versatic acid vinyl ester / acrylic copolymer resin, vinyl acetate / acrylic copolymer resin, polyethylene resin, vinyl chloride resin, polypropylene resin, polystyrene resin and the like. These resins can be used alone or in combination of two or more.

The resin component (A) of the present invention preferably contains a thermoplastic resin as a synthetic resin other than the above-mentioned fluororesin and the fluorine-containing resin. Further, as the synthetic resin other than the fluorine-containing resin, it is preferable to include at least one of acrylic resin, styrene resin, acrylic styrene resin, vinyl acetate resin, vinyl acetate / ethylene copolymer resin and the like. This makes it possible to obtain an excellent effect in terms of foamability. As the resin component (A) of the present invention, an embodiment containing a polyol component and an isocyanate component can be excluded.

In the above (1), the content of the fluorine-containing resin in the resin component (A) is more preferably 10 to 150 mg / kg (preferably 15 to 110 mg / kg, more preferably 15 to 110 mg / kg) in the film formed by the coating material. May be blended so as to be 20 to 100 mg / kg). Specifically, when the resin component (A) is composed only of the fluorine-containing resin, the content of the fluorine-containing monomer may be appropriately set. When the resin component (A) contains a fluorine-containing resin and other synthetic resins, the fluorine-containing resin is preferably 0.5 to 30 in terms of solid content with respect to the total amount of the resin component (A). It is by weight% (more preferably 1 to 10% by weight).

The fluorine compound (B) (excluding the fluorine-containing resin) in the above (2) is not particularly limited as long as it is a fluorine-containing component, and for example, a fluorine-containing surfactant, a defoaming agent, a leveling agent, etc. Various additives can be used.

In the above (2), the content of the fluorine compound (B) is such that the fluorine content in the coating film formed by the coating material is 10 to 150 mg / kg (preferably 15 to 110 mg / kg, more preferably 20 to 100 mg / kg). It may be blended so as to be (kg). Specifically, when the resin component (A) contains a fluorine-containing resin, the adjustment may be made according to the fluorine content of the resin component (A), but the fluorine compound (B) may be adjusted with respect to the total amount of the resin component (A). ) Is preferably 0.01 to 20 parts by weight (more preferably 0.5 to 10 parts by weight) in terms of solid content. When the resin component (A) does not contain the fluorine-containing resin, the fluorine compound (B) is preferably 0.1 to 30 parts by weight (in terms of solid content) with respect to the total amount of the resin component (A). More preferably, it is 1 to 10 parts by weight).

Further, the coating material of the present invention contains a refractory-imparting powder. Examples of the refractory-imparting powder include a foaming agent (C), a carbonizing agent (D), a flame retardant (E), and a filler (F).

Examples of the foaming agent (C) include melamine and its derivatives, dicyandiamide and its derivatives, azobistetrasome and its derivatives, azodicarbonamide, urea, thiourea and the like. These can be used by one kind or two or more kinds. The content of the foaming agent (C) is preferably 10 to 200 parts by weight (more preferably 20 to 150 parts by weight) with respect to 100 parts by weight of the solid content of the resin component (A). The foaming agent (C) of the present invention imparts a foaming action to the coating film due to a temperature rise in the event of a fire or the like, and specifically, when the temperature of the coating film surface is preferably 200 ° C. or higher. It imparts a foaming action.

Examples of the carbonizing agent (D) include pentaerythritol, dipentaerythritol, trimethylolpropane, starch, casein and the like. These can be used by one kind or two or more kinds. In the present invention, pentaerythritol and dipentaerythritol are particularly preferable because they are excellent in dehydration cooling effect and carbonized heat insulating layer forming effect. The content of the carbonizing agent (D) is preferably 10 to 200 parts by weight (more preferably 20 to 120 parts by weight) with respect to 100 parts by weight of the solid content of the resin component (A). The carbonizing agent (D) of the present invention imparts an action of forming a carbonized heat insulating layer by dehydrating and carbonizing the resin component (a) together with carbonization due to a temperature rise in the event of a fire or the like.

Examples of the flame retardant (E) include organophosphorus compounds such as tricresyl phosphate and diphenyl cresyl phosphate; chlorinated polyphenyl, chlorinated polyethylene, diphenyl chloride, triphenyl chloride, chlorinated paraffin, and fatty acid pentachloride. Chlorine compounds such as esters, perchloropentacyclodecane, chlorinated naphthalene, and tetrachloroanophthalic acid; antimony compounds such as antimon trioxide and antimon pentoxide; phosphorus trichloride, phosphorus pentoxide, ammonium phosphate, ammonium polyphosphate, phosphorus Phosphate compounds such as melamine acid, melamine polyphosphate, melam polyphosphate, melem polyphosphate, boron phosphate, boron polyphosphate, aluminum phosphate, aluminum polyphosphate; and other inorganic compounds such as zinc borate and sodium borate. Be done. These can be used by one kind or two or more kinds. In the present invention, the flame retardant (E) preferably contains a phosphorus compound. The content of the flame retardant (E) is preferably 100 to 1000 parts by weight (more preferably 200 to 800 parts by weight) with respect to 100 parts by weight of the solid content of the resin component (A).

Examples of the filler (F) include talc, calcium carbonate, sodium carbonate, aluminum oxide (alumina), titanium oxide, zinc oxide, silica, clay, clay, silas, mica, silica sand, silica stone powder, quartz powder, and barium sulfate. And so on. These can be used by one kind or two or more kinds. The content of the filler (F) is preferably 3 to 200 parts by weight (more preferably 5 to 150 parts by weight) with respect to 100 parts by weight of the solid content of the resin component (A).

Further, in the present invention, a metal hydrate (G) can be contained in addition to the above components. The metal hydrate (G) exhibits endothermic properties due to a dehydration reaction or the like when the temperature rises, and is different from the filler (F). Examples of such a metal hydrate (G) include aluminum hydroxide, magnesium hydroxide and the like. These can be used alone or in combination of two or more. The average particle size of the metal hydrate (G) is preferably 0.1 to 20 μm (more preferably 0.2 to 15 μm, still more preferably 0.3 to 8 μm, most preferably 0.4 to 3 μm). Is. The content of the metal hydrate (G) is preferably 1 to 200 parts by weight (more preferably 10 to 100 parts by weight, still more preferably 25 to 25 to parts) with respect to 100 parts by weight of the solid content of the resin component (A). 80 parts by weight).

In the present invention, it is preferable to use the filler (F) and the metal hydrate (G) in combination, in which case the filler (F) and the metal hydrate (G) have a weight ratio of 1: 9 to 9: 1. (More preferably 2: 8 to 8: 2). In this case, foamability, particularly shrinkage of the carbonized heat insulating layer under high temperature can be suppressed, and a stable carbonized heat insulating layer can be formed, so that the effect of the present invention can be enhanced. The average particle size is measured by a laser diffraction type particle size distribution measuring device.

In addition, the additive may be any additive as long as it does not significantly impair the effects of the present invention, for example, pigments, fibers, wetting agents, plasticizers, lubricants, preservatives, fungicides, algae-proofing agents, antibacterial agents, and additives. Examples thereof include thickeners, leveling agents, dispersants, defoamers, cross-linking agents, ultraviolet absorbers, antioxidants, diluting solvents and the like.

The coating material of the present invention can be produced by uniformly mixing the above components by a conventional method. Examples of the form of the coating material of the present invention include a coating material containing the above-mentioned constituent components, a sheet containing the above-mentioned constituent components, and the like.

The coating material of the present invention is suitable as a foamable fireproof coating material applied to the surface coating of structures such as buildings and civil engineering structures, and is coated or attached to a base material to which heat resistance is to be imparted. By doing so, the effect can be exhibited. Specifically, it can be applied to various base materials such as walls, pillars, floors, beams, roofs, stairs, ceilings, and doors. Applicable base materials include, for example, concrete, mortar, siding board, extruded board, gypsum board, pearlite board, brick, plastic, wood, metal, steel frame (steel material), glass, porcelain tile and the like. These base materials may be those having a film formed on the surface thereof, those having some kind of base treatment (rust prevention treatment, flame retardant treatment, etc.), those having wallpaper attached, and the like.

When the coating material of the present invention is a coating material, it may be either a one-component type or a two-component type coating material depending on the type of resin component used. In the two-component type, the main agent and the curing agent may be stored in separate packages at the time of distribution, and these may be mixed at the time of use (at the time of application).

Further, when the coating material is applied to the base material, for example, a coating tool such as a spray, a roller, a brush, or a trowel may be used to apply the coating material in one or several steps. At the time of attachment, it can be diluted with water, a solvent or the like if necessary. The film thickness to be finally formed may be appropriately set depending on the desired functionality, application site, etc., but is preferably about 0.4 to 5 mm.

When the coating material of the present invention is previously molded into a sheet shape, a mixture obtained by uniformly mixing the above-mentioned components may be molded by a known method. When mixing each component, it is also possible to mix the solvent or heat it as needed. When a bead-shaped or pellet-shaped binder is used, each component may be mixed by heating with a heating device to the softening temperature of the binder and kneading with a kneader or the like. The obtained sheet-shaped covering material can be attached using an adhesive, nails, studs, or the like.

The thickness of the sheet-shaped covering material of the present invention may be appropriately set according to the application site and the like, but is preferably 0.2 to 10 mm, more preferably about 0.5 to 6 mm. As a result, excellent heat resistance can be exhibited when exposed to a high temperature such as in a fire. Further, the sheet-shaped covering material may be composed only of a sheet containing the above-mentioned constituent components, but a reinforcing material such as a fibrous sheet containing organic fibers and / or inorganic fibers on the back surface (base material side). May be laminated.

In the present invention, in order to protect the coating film formed by the above-mentioned coating material, a topcoat material may be further applied if necessary. Such a topcoat material can be formed by applying a known covering material. As the topcoat material, for example, an acrylic resin-based, urethane resin-based, acrylic silicon resin-based, fluororesin-based or the like coating material can be used. The topcoat material may be applied by a known application method, and for example, a coating tool such as a spray, a roller, or a brush can be used.

Examples are shown below to further clarify the features of the present invention. However, the present invention is not limited to this range.

(Coating material 1-2, 4-10)
According to the formulation shown in Table 1, each raw material was mixed and stirred by a conventional method, and diluted with a solvent to produce coating materials 1 to 2, 4 to 10. The following raw materials were used.
(Coating material 3)
According to the formulation shown in Table 1, the mixture of each raw material is kneaded with a pressure kneader set at a temperature of 120 ° C. to prepare a kneaded material for a sheet, and then the kneaded material is laminated on an inorganic fiber sheet and processed into a sheet by a rolling roller. , A sheet-like covering material (450 mm × 1200 mm) having a film thickness of 1.5 mm was produced.

-Resin component (A)
Resin component (A-1): Fluorine-containing resin (fluoroethylene / vinyl ether alternating copolymer)
Resin component (A-2): Fluorine-containing resin (acrylic composite polytetrafluoroethylene)
Resin component (A-3): Acrylic styrene resin
Resin component (A-4): Vinyl acetate / ethylene copolymer resin
-Fluorine compound (B): Fluorine-containing surfactant

・ Foaming agent (C): Melamine ・ Carbide (D): Dipentaerythritol ・ Flame retardant (E): Ammonium polyphosphate ・ Filler (F): Titanium oxide ・ Additives: Dispersants, defoamers, plasticizers Etc. (excluding fluorine-containing compounds)

(Test Examples 1-2, 4-10)
A coating material was spray-coated on one side of a pre-rust-prevented steel sheet (length 150 mm x width 70 mm x thickness 1.6 mm) (dry film thickness 1.5 mm) and cured at room temperature (25 ° C) for 7 days. The following evaluations were carried out using the test specimens.
(Test Example 3)
A steel plate (length 150 mm x width 70 mm x thickness 1.6 mm) that has been pre-painted to prevent rust and is attached via an adhesive (acrylic resin) so that the inorganic fiber sheet side of the covering material 3 is on the steel plate side. Was used as a test body, and the following evaluation was carried out.

<Heat resistance evaluation 1>
Foaming magnification when radiant heat of 50 kW / m ² is radiated to the surface of the test piece (coating material side) for 15 minutes using an electric heater (CONEIII, manufactured by Toyo Seiki Co., Ltd.) based on the ISO 5660-1 cone calorimeter method. , And the temperature of the back surface of the steel sheet was measured. Each evaluation standard is as follows. The results are shown in Table 1.
(Effervescence magnification)
AA: Effervescence ratio over 35 times A: Effervescence ratio over 25 times over 35 times B: Effervescence ratio over 20 times over 25 times C: Effervescence ratio over 15 times over 20 times D: Effervescence ratio 15 times or less (back surface temperature)
AA: Less than 430 ° C A: 430 ° C or more and less than 470 ° C B: 470 ° C or more and less than 500 ° C C: 500 ° C or more and less than 550 ° C D: Over 550 ° C

<Heat resistance evaluation 2>
Based on the ISO 5660-1 cone calorimeter method, the foaming ratio and the temperature of the back surface of the steel sheet when radiant heat of 50 kW / m ² is radiated to the surface of the test piece for 30 minutes using an electric heater (CONEIII, manufactured by Toyo Seiki Co., Ltd.). Was measured, and the incineration property was further evaluated. The evaluation criteria for the foaming ratio and the temperature on the back surface of the steel sheet are the same as those for the heat resistance evaluation 1. The incineration evaluation criteria are as follows. The results are shown in Table 1.

(Evaluation of incineration)
In the above heat resistance evaluation 2, the cross section of the carbonized heat insulating layer formed after radiating radiant heat for 30 minutes was confirmed, and the ratio of the ashed (white) portion was calculated. The evaluation criteria were four-stage evaluation (excellent: A>B>C> D: inferior), with less ashing being "A" and advanced ashing being "D".

In Test Examples 1 to 9, both heat resistance evaluation 1 and heat resistance evaluation 2 (under high temperature in which the heating test is extended) are excellent in foamability, stably form a carbonized heat insulating layer, and further, a carbonized heat insulating layer. It was possible to suppress the shrinkage of the wine, and it was possible to exhibit sufficient heat-resistant protection performance. On the other hand, in Test Example 10, the foamability was lower than that of Test Examples 1 to 9, and further, shrinkage of the carbonized heat insulating layer was observed when the heating test was extended.

Claims (2)

The coating is a coating material that forms a carbonized heat insulating layer by increasing the temperature.
The coating material is a foamable refractory coating material that forms a carbonized heat insulating layer when the coating surface temperature is 200 ° C. or higher.
The coating material contains a resin component and a refractory-imparting powder.
The refractory-imparting powder contains a foaming agent, a carbonizing agent, a flame retardant, and a filler.
A coating material having a fluorine content of 10 to 150 mg / kg. The coating material according to claim 1, wherein the coating material contains a fluorine-containing resin as a resin component.