Paint composition, coating material, coating layer-provided base material, and method for producing same

Abstract

[Problem] To provide a paint composition that can provide, to a base material, impact resistance and fireproof capability without accompanying difficulty in painting work. [Solution] This paint composition contains an isocyanate component, an amine component, and a fireproofing agent. The isocyanate component includes an aliphatic poly isocyanate. The amine component includes at least one polyamine (a) selected from the group consisting of dimethyl thiotoluene diamine, diamino diphenyl methane, and aspartic acid ester amine.

Description

Coating composition, coating material, substrate with coated layer, and method for producing same

[0001] The present invention relates to a coating composition, a coating material, a substrate with a coated layer, and a method for producing the same.

[0002] Thermoplastic resins such as polyvinyl chloride, polystyrene, acrylic resin, polyethylene, and polypropylene are inexpensive and have excellent processability and moldability, and are used in a wide variety of molded products, including facility piping, drainage pipes, drainage manholes, drainage covers, electrical wiring piping, and joints.

[0003] However, thermoplastic resin molded products have poor impact resistance and are prone to cracking and breakage when stress is applied. Thermoplastic resin molded products also have other problems, such as poor fire resistance and poor weather resistance, which makes them susceptible to whitening and deterioration due to ultraviolet rays.

[0004] Patent Document 1 proposes a vinyl chloride resin pipe in which the outer periphery of a vinyl chloride resin pipe body is coated with an outer layer having a thickness of 20 to 200 μm, the outer layer being made of an acrylic-vinyl chloride copolymer resin composition obtained by craft polymerization of an acrylic copolymer with a vinyl chloride monomer, for the purpose of improving weather resistance.

[0005] Furthermore, Patent Document 2 proposes a resin pipe characterized in that, for the purpose of improving weather resistance, the outer periphery of a pipe body made of a vinyl chloride polymer is covered with an outer layer made of an acrylonitrile / ethylene propylene rubber / styrene copolymer (AES resin), and the thickness of the outer layer is set to 0.2 to 0.4 mm.

[0006] Furthermore, Patent Document 3 proposes a building piping material that is made of a fire-resistant resin composition in which thermally expandable graphite is contained in a polyvinyl chloride resin from the viewpoints of fire prevention and workability, and the blending ratio is 1 to 10 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin.

[0007] On the other hand, polyurea resin is a curable resin compound based on urea bonds generated by the chemical reaction of isocyanate and polyamine, and has excellent impact resistance, waterproofing, chemical resistance, abrasion resistance, heat resistance, corrosion resistance, etc. Furthermore, hardness and elongation can be freely adjusted by selecting the combination of isocyanate and amine.

[0008] Coating of substrates with polyurea resins is usually carried out by applying a heated mixture of isocyanate and amine using an impingement mix sprayer. This method produces a cured product within a few seconds to a few minutes of application, making it effective for coating large surfaces (such as rooftops, the inner surfaces of underground pits, and tunnel walls) in a short time.

[0009] Japanese Patent Publication No. 2002-254576 Japanese Patent No. 4800815 Japanese Patent Publication No. 2008-180068

[0010] However, the techniques proposed in Patent Documents 1 to 3 have room for further improvement in terms of imparting impact resistance and fire resistance to pipes and the like made of thermoplastic resins such as polyvinyl chloride resin.

[0011] Furthermore, when coating with polyurethane resin using an impingement mixing spray device, unless the discharge pressure is increased, problems arise such as the paint not being mixed uniformly and the nozzle tip becoming clogged. However, if an attempt is made to spray polyurethane paint at once at a high discharge pressure onto a substrate with a relatively small area such as a pipe, only a small amount of paint will effectively adhere to the substrate, and most of the paint will be wasted. It is also difficult to adjust the thickness of the coating film, particularly to form a thin, even coating film (for example, 1 mm or less).

[0012] Therefore, an object of the present invention is to provide a coating composition and a coating material that can impart impact resistance and fire resistance to substrates such as pipes made of thermoplastic resins such as polyvinyl chloride resin without causing difficulty in the coating work.

[0013] The present invention relates to, for example, the following items [1] to

[16] : [1] A coating composition comprising an isocyanate component, an amine component, and a fire retardant, wherein the isocyanate component comprises an aliphatic polyisocyanate, and the amine component comprises at least one polyamine (a) selected from the group consisting of dimethylthiotoluenediamine, diaminodiphenylmethane, and aspartic acid ester amine.

[0014] [2] The coating composition according to [1], wherein the fireproofing agent is a mixture containing microcapsules formed by coating ammonium polyphosphate powder with a resin, a melamine compound powder, and a pentaerythritol compound powder.

[0015] [3] The coating composition according to [1] or [2], which contains at least one heat-shielding agent selected from the group consisting of hollow ceramic particles and white pigments.

[0016] [4] The coating composition according to any one of [1] to [3] above, which contains a solvent.

[0017] [5] A coating material comprising: a polyurea that is a reaction product of an isocyanate component and an amine component; and a fire retardant, wherein the isocyanate component comprises an aliphatic polyisocyanate; and the amine component comprises polyamine (a) that is at least one selected from the group consisting of dimethylthiotoluenediamine, diaminodiphenylmethane, and aspartic acid ester amine.

[0018] [6] The coating material according to [5] above, which is a cured product of the coating composition according to any one of [1] to [4] above.

[0019] [7] A substrate with a coating layer, comprising a substrate and a coating layer that coats the substrate, wherein the coating layer is made of the coating material according to [5] or [6].

[0020] [8] The substrate with a coating layer according to [7], wherein the substrate and the coating layer are in contact with each other via an undercoat layer.

[0021] [9] The substrate with a coating layer according to [7] or [8], wherein the substrate is a molded product of a thermoplastic resin.

[0022]

[10] The substrate with a coating layer according to [9], wherein the thermoplastic resin is polyvinyl chloride.

[0023]

[11] The substrate with a coating layer according to [9] or

[10] , wherein the substrate is a facility piping, a drain pipe, a drain box, a drain cover, an electric wiring piping or a joint.

[0024]

[12] A method for producing a substrate with a coating layer, comprising the steps of applying the coating composition according to any one of [1] to [4] to a substrate and curing it to form a coating layer.

[0025]

[13] A method for producing a substrate with a coating layer, comprising: a step of forming an undercoat layer on a substrate; and a step of applying the coating composition of any one of [1] to [4] to the undercoat layer and curing it to form a coating layer.

[0026]

[14] The method for producing a substrate with a coating layer according to

[12] or

[13] , wherein the substrate is a molded product of a thermoplastic resin.

[0027]

[15] The method for producing a substrate with a coating layer according to

[14] , wherein the thermoplastic resin is polyvinyl chloride.

[0028]

[16] The method for producing a substrate with a coating layer according to

[14] or

[15] , wherein the substrate is a facility piping, a drain pipe, a drain box, a drain cover, an electric wiring piping or a joint.

[0029] The coating composition of the present invention can impart impact resistance and fire resistance to substrates such as pipes made of thermoplastic resins such as polyvinyl chloride resins without causing any difficulty in the coating work.

[0030] The present invention will be described in further detail below. [Paint Composition] The paint composition according to the present invention contains an isocyanate component, an amine component, and a fire retardant.

[0031] <Isocyanate Component> The isocyanate component contains an aliphatic polyisocyanate. Aliphatic polyisocyanates are highly stable against ultraviolet light, and polyurea resins using aliphatic isocyanates as the raw isocyanate are less susceptible to oxidation or deterioration (i.e., have superior weather resistance) than polyurea resins using aromatic isocyanates as the raw isocyanate. For this reason, coating materials formed from the coating composition of the present invention are extremely effective for coating articles, particularly those used outdoors.

[0032] Examples of the aliphatic polyisocyanate include tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, octamethylene diisocyanate, dodecamethylene diisocyanate, and isophorone diisocyanate. These may form polymers such as dimers.

[0033] Examples of commercially available aliphatic polyisocyanates include Desmodur (registered trademark) N3400, N3900, XP2840, XP2860, and E2863XP manufactured by Covestro.

[0034] The aliphatic polyisocyanate may be used alone or in combination of two or more. The isocyanate component may or may not contain a small amount (5% by mass or less, or 1% by mass or less in the isocyanate component) of a monoisocyanate or an aromatic polyisocyanate, as long as the effects of the present invention are not impaired.

[0035] <Amine Component> The amine component contains at least one polyamine (a) selected from the group consisting of dimethylthiotoluenediamine (DMTDA), diaminodiphenylmethane, and aspartic acid ester amine. The polyamine (a) may be used alone or in combination of two or more. A representative structural formula of dimethylthiotoluenediamine is as follows:

[0036]

[0037] Examples of dimethylthiotoluenediamine include 2-methyl-4,6-bis(methylsulfanyl)-1,3-benzenediamine and 4-methyl-2,6-bis(methylsulfanyl)-1,3-benzenediamine. Dimethylthiotoluenediamine may be modified to the extent that the effects of the present invention are not impaired.

[0038] Dimethylthiotoluenediamine may be used alone or in combination of two or more. A typical structural formula of diaminodiphenylmethane is as follows:

[0039]

[0040] (4,4'-Diaminodiphenylmethane) Examples of diaminodiphenylmethane other than 4,4'-diaminodiphenylmethane include 3,3'-diaminodiphenylmethane and 3,4'-diaminodiphenylmethane.

[0041] The diaminodiphenylmethane may be used alone or in combination of two or more. A typical structural formula of the aspartic acid ester amine is as follows:

[0042]

[0043] R 1 is preferably a linear, branched, or cyclic aliphatic group (preferably having 1 to 40 carbon atoms), and more preferably selected from the group of divalent hydrocarbon groups obtained by removing the amino group from 1,4-diaminobutane, 1,5-diamino-2-methylpentane, 1,6-diaminohexane, 2,2,4-trimethyl-1,6-diaminohexane, 2,4,4-trimethyl-1,6-diaminohexane, 1-amino-3,3,5-trimethyl-5-aminomethyl-cyclohexane, 4,4'-diamino-dicyclohexylmethane, or 3,3-dimethyl-4,4'-diamino-dicyclohexylmethane.

[0044] R 2Examples of R include alkyl groups having 1 to 20 carbon atoms (preferably 1 to 8, more preferably 1 to 4) (e.g., methyl, ethyl, n-propyl, isopropyl, n-butyl, and t-butyl). 2 may be the same as or different from each other.

[0045] The aspartic acid ester amine may be modified to the extent that the effects of the present invention are not impaired. The aspartic acid ester amine may be used alone or in combination of two or more.

[0046] Examples of commercially available polyamines (a) include DESMOPHEN (registered trademark) NH 1220, NH 1420, NH 1520, NH 1723LF, and NH2850XP manufactured by Covestro.

[0047] While most aliphatic amines react with isocyanates rapidly, for example, within a few seconds, the polyamine (a) reacts with isocyanates relatively slowly. Therefore, the coating composition of the present invention containing the polyamine (a) not only allows for the adjustment of the curing time of the polyurea resin, which has excellent weather resistance, but also allows for the appropriate setting of hardness, elongation, viscosity, etc. Therefore, the coating composition of the present invention can be easily applied using a brush, roller, general-purpose airless spray, etc., and can also be used to coat molded objects with complex shapes and fine molded objects.

[0048] The amine component may or may not contain a small amount (5% by mass or less or 1% by mass or less in the amine component) of a monoamine or a polyamine other than the polyamine (a), as long as the effects of the present invention are not impaired. The amine component may also contain a modified fumaric acid diethyl ester, as long as the effects of the present invention are not impaired. The amine component is usually used in such a ratio that the molar ratio of amino groups in the amine component to NCO groups in the isocyanate component (amino groups / NCO groups) is 1.

[0049] <Fireproofing Agent> The fireproofing agent is preferably a mixture of microcapsules in which ammonium polyphosphate is coated with a resin, a melamine compound powder, and a pentaerythritol compound powder (hereinafter also referred to as "fireproofing agent mixture 1").

[0050] Ammonium polyphosphate dehydrates and carbonizes organic matter in a heated environment, forming a fire-resistant carbonized layer and also forming a fire-resistant inorganic phosphate film. It also decomposes when heated to generate ammonia gas, which acts as a foaming agent to expand organic matter.

[0051] The method for microencapsulating ammonium polyphosphate is not particularly limited, but for example, the method described in paragraph

[0011] of Japanese Patent No. 4809924 can be used.

[0052] The resin for coating ammonium polyphosphate is not particularly limited, but is preferably one that forms a coating film that is difficult for water to permeate and has excellent water resistance, such as melamine resin, etc. These may be used alone or in combination of two or more.

[0053] Melamine resins are also condensation products of aldehydes, especially formaldehyde, with melamine or its derivatives. The melamine resins may be fully or partially etherified with alkanols containing 1 to 6 carbon atoms.

[0054] The average particle size of the microcapsules (average particle size measured by a laser diffraction / scattering method; the same applies below) is not particularly limited, but is preferably 60 to 120 μm. n+2 P n O 3n+1 (wherein n is an integer of 2 or more).

[0055] The melamine compounds include melamine, its derivatives, and resins thereof, and examples of the melamine derivatives include melam, melem, melon, benzoguanamine, melamine sulfate, melamine cyanurate, melamine polyphosphate, etc. The average particle size of the melamine compound powder is not particularly limited, but is preferably 60 to 120 μm.

[0056] Examples of the pentaerythritol compound include pentaerythritol and its condensation product, polypentaerythritol (dipentaerythritol, tripentaerythritol, etc.).

[0057] The average particle size of the pentaerythritol compound powder is not particularly limited, but is preferably 60 to 120 μm. The mass ratio of the components in the fireproofing agent mixture 1 (mass of ammonium polyphosphate:mass of melamine compound powder:mass of pentaerythritol compound powder) is preferably 1:0.1-1.0:0.1-0.8.

[0058] The content of the fireproofing agent is preferably 10 to 60 parts by mass, more preferably 20 to 50 parts by mass, relative to 100 parts by mass of the polyurea resin produced by the reaction between the isocyanate component and the amine component.

[0059] <Heat Shielding Agent> The coating composition according to the present invention may contain a heat shielding agent. Examples of the heat shielding agent include hollow ceramic particles and white pigments.

[0060] Examples of ceramics that form the hollow ceramic particles include silica, silica-alumina, and alumina, and among these, silica is preferred from the viewpoint of reflection and radiation of solar energy and conversion into kinetic energy.

[0061] Examples of components constituting the white pigment include titanium oxide, zinc oxide, and calcium oxide. Among these, titanium oxide is preferred because it has a low environmental impact and a high photocatalytic function.

[0062] These may be used alone or in combination of two or more, and it is preferable to use hollow ceramic particles in combination with a white pigment. When hollow ceramic particles and a white pigment are used in combination, the mass ratio thereof (mass of hollow ceramic particles:mass of white pigment) is preferably 20:1 to 30.

[0063] The content of the heat-shielding agent is preferably 5 to 80 parts by mass, more preferably 10 to 50 parts by mass, based on 100 parts by mass of the polyurea resin produced by the reaction between the isocyanate component and the amine component.

[0064] <Solvent> The coating composition of the present invention may contain a solvent. By using a solvent, it becomes possible to more precisely adjust the viscosity and curing time of the coating composition of the present invention due to the reaction between the isocyanate component and the amine component.

[0065] Examples of the solvent include alcohols, ketones, ethers, and esters. Specific examples of the alcohol include methanol, ethanol, butanol, isobutanol, isopropyl alcohol, normal propyl alcohol, and tertiary butanol.

[0066] Specific examples of ketones include acetone, methyl ethyl ketone, diethyl ketone, methyl propyl ketone, methyl isobutyl ketone, methyl amyl ketone, cyclohexanone, isophorone, acetophenone, and benzophenone.

[0067] Specific examples of ethers include dimethyl ether, ethyl methyl ether, diethyl ether, diphenyl ether, ethylene oxide, tetrahydrofuran, furan, 1,4-dioxane, anisole, benzofuran, dibenzofuran, and crown ether.

[0068] Specific examples of the ester include ethyl acetate, butyl acetate, methoxybutyl acetate, amyl acetate, normal propyl acetate, and isopropyl acetate. These solvents may be used alone or in combination of two or more.

[0069] <Additives> The coating composition of the present invention can be further improved in functionality by adding various additives. Specific examples of the additives include plasticizers, dispersants, anti-settling agents, leveling agents, thickeners, anti-foaming agents, drying agents, anti-sagging agents, and matting agents. These additives may be used alone or in combination of two or more.

[0070] [Coating material and substrate with coating layer] The coating material according to the present invention contains polyurea, which is a reaction product of the isocyanate component and the amine component, and a fire retardant, and is preferably a cured product of the coating composition according to the present invention. The substrate with a coating layer according to the present invention is a substrate with a coating layer having a substrate and a coating layer covering the substrate, and the coating layer is made of the coating material according to the present invention.

[0071] <Substrate> The coating material according to the present invention is particularly effective for coating substrates made of thermoplastic resin molded articles. Examples of the thermoplastic resin include polyvinyl chloride, polystyrene, acrylic resin, polyethylene, and polypropylene, with polyvinyl chloride being particularly preferred. Examples of the substrate include facility piping, drainage pipes, drainage manholes, drainage covers, electrical wiring piping, and joints, with polyvinyl chloride being particularly preferred. These substrates are used in large quantities in fields that support social infrastructure, and improvements in impact resistance, fire resistance, and the like are desirable.

[0072] Furthermore, when existing piping in a factory, facility, etc. deteriorates, replacing it with new piping requires stopping the operation of the factory, facility, etc., which not only incurs replacement costs but also damages associated with the shutdown of operation, but by coating the deteriorated existing piping as a substrate with the coating composition of the present invention and then covering the deteriorated existing piping with the coating material of the present invention, it is possible to impart impact resistance and fire resistance to the deteriorated existing piping without stopping the operation of the factory, facility, etc. Further examples of substrates include floors, columns, beams, walls, and roofs of structures.

[0073] <Undercoat layer> In the substrate with a coating layer, the substrate and the coating layer are preferably in contact with each other via an undercoat layer. The undercoat layer is provided, for example, to improve adhesion between the substrate and the coating layer. The undercoat layer is preferably formed from a water-soluble undercoat paint. Water-soluble undercoat paints are particularly preferred because they are less likely to cause problems such as eroding or dissolving the substrate or eluting components in the substrate.

[0074] Specific examples of water-soluble undercoating paints include epoxy resin emulsion, acrylic resin emulsion, cationic acrylic silicone resin, and emulsion of chemically treated cellulose.

[0075] These may be used alone or in combination of two or more. The primer coating may also contain a leveling agent, a thickener, an antifoaming agent, etc. as necessary. The primer layer can be formed by applying the primer coating to the substrate and drying and curing the formed coating film.

[0076] (Method for producing substrate with coated layer) The method for producing a substrate with a coated layer according to the present invention includes the steps of applying the coating composition according to the present invention to a substrate and curing it to form a coating layer.

[0077] Alternatively, the method for producing a substrate with a coating layer according to the present invention includes the steps of forming an undercoat layer on a substrate, and applying the coating composition according to the present invention to the undercoat layer and curing it to form a coating layer.

[0078] Methods for applying the coating composition of the present invention to the substrate or primer layer include application by brush, roller, general-purpose airless spray, etc. As described above, the coating composition of the present invention contains, as the amine component, polyamine (a) which reacts relatively slowly with the isocyanate component, and therefore can be easily applied without using equipment such as an impingement mix spray.

[0079] A coating film formed from the coating composition of the present invention is cured to form a coating layer. The curing time is, for example, 12 to 72 hours, preferably 18 to 48 hours, and the curing temperature is, for example, 0 to 40°C, preferably around room temperature (e.g., 20 to 30°C).

[0080] According to the present invention, it is possible to impart impact resistance, fire resistance, and the like to a substrate in a simple manner. In particular, these properties can be imparted to molded articles made of polyvinyl chloride, which support social infrastructure, thereby contributing to solving issues such as national resilience and disaster prevention. In particular, when the substrate is aged pipes, piping, etc., manufacturing new ones to replace them consumes a lot of energy and generates a lot of greenhouse gases. However, according to the present invention, the life of these substrates can be extended and the aforementioned energy consumption and gas generation can be reduced.

[0081] The present invention will be described in more detail below with reference to examples, although the present invention is not limited to these examples in any way.

[0082] [Production Example 1] A rigid polyvinyl chloride pipe (diameter: 100 mm, length: 1000 mm) that had been installed outdoors for 20 years was prepared, and an aqueous epoxy resin paint was applied to the outer surface of the pipe as a primer paint and dried for 12 hours to form a primer layer, thereby obtaining a substrate with a primer layer.

[0083] Example 1 The components shown in Table 1 (all commercially available products; the same applies to other Examples and Comparative Examples) were mixed to prepare coating composition 1. The isocyanate component and the amine component were used in a molar ratio of NCO group:amino group = 1:1 (the same applies to other Examples and Comparative Example 2). The viscosity of coating composition 1 was 800 mPa s.

[0084]

[0085] Coating composition 1 was applied with a brush to a thickness of 400 μm within 30 minutes of preparation to the undercoat layer of the substrate with an undercoat layer produced in Production Example 1. The tack-dry time for coating film 1 formed from coating composition 1 was approximately 1 hour (at an air temperature of 23° C.). Coating film 1 was then left to stand for 24 hours to further harden and form a coating layer, thereby obtaining a substrate with a coating layer.

[0086] Example 2 Coating composition 2 was prepared by mixing the components shown in Table 2. The viscosity of coating composition 2 was 700 mPa·s.

[0087]

[0088] Coating composition 2 was applied with a brush to a thickness of 400 μm within 30 minutes of preparation to the undercoat layer of the substrate with an undercoat layer produced in Production Example 1. The tack-dry time of coating film 2 formed from coating composition 2 was approximately 1 hour and 30 minutes (at an air temperature of 23° C.). Coating film 2 was then left to stand for 24 hours to further harden and form a coating layer, thereby obtaining a substrate with a coating layer.

[0089] Example 3 Coating composition 3 was prepared by mixing the components shown in Table 3. The viscosity of coating composition 3 was 150 mPa·s.

[0090]

[0091] Coating composition 3 was applied to a thickness of 400 μm using a general-purpose air spray within 30 minutes of preparation onto the undercoat layer of the substrate with an undercoat layer produced in Production Example 1. The tack-free time for coating film 3 formed from coating composition 3 was approximately 2 hours (at an air temperature of 23° C.). Coating film 3 was then left to stand for 24 hours to further harden and form a coating layer, thereby obtaining a substrate with a coating layer.

[0092] Example 4 The components shown in Table 4 were mixed to prepare coating composition 4. The viscosity of coating composition 4 was 120 mPa·s.

[0093]

[0094] Coating composition 4 was applied to the undercoat layer of the substrate with a primer layer produced in Production Example 1 using a general-purpose airless spray within 30 minutes of preparation to a thickness of 400 μm. The tack-free time for coating film 4 formed from coating composition 4 was approximately 2 hours (at an air temperature of 23° C.). Coating film 4 was then left to stand for 24 hours to further harden and form a coating layer, thereby obtaining a substrate with a coating layer.

[0095] Comparative Example 1 A rigid polyvinyl chloride pipe that had been installed outdoors for 20 years (for convenience, this will be referred to as a "substrate with a coating layer" in the "Test Results" section below) was prepared and was not subjected to any treatment.

[0096] Comparative Example 2: 100 parts by mass of an isocyanate component (Desmodur N 3400, manufactured by Covestro) and 100 parts by mass of an amine component (DESMOPHEN NH 1723 LF, manufactured by Covestro) were mixed to prepare coating composition c2. The viscosity of coating composition c2 was 400 mPa·s.

[0097] The coating paint composition c2 was applied to the undercoat layer of the substrate with undercoat layer produced in Production Example 1 with a brush within 30 minutes after preparation to a thickness of 400 μm, and then left to stand for 24 hours to further harden and form a coating layer, thereby obtaining a substrate with a coating layer.

[0098] Comparative Example 3 100 parts by mass of AES resin (Unibright (registered trademark) UA-1500, manufactured by Nippon A&L Co., Ltd.) and 500 parts by mass of a solvent (methyl ethyl ketone) were mixed to prepare coating composition c3.

[0099] The coating paint composition c3 was applied to the undercoat layer of the substrate with an undercoat layer produced in Production Example 1 within 30 minutes after preparation to a thickness of 400 μm, and was left to stand for 24 hours to further harden and form a coating layer, thereby obtaining a substrate with a coating layer.

[0100] [Test Results] The substrates with coating layers obtained in each of the Examples and Comparative Examples were used as test specimens to carry out the following tests.

[0101] [Test 1: Impact Resistance] An iron ball weighing 2 kg was dropped from a height of 1 m onto the outer circumferential surface of a fixed test specimen, and the test specimen was visually observed for damage.

[0102] [Test 2: Fire resistance] A gas burner was placed 10 cm from the outer periphery of the fixed test specimen, and a flame at a temperature of 1200° C. was applied directly to the outer periphery of the test specimen, and the burning state was visually observed.

[0103] [Test 3 - Heat Insulation] A test specimen was fixed in a thermostatic chamber at 23°C, a 1500 W xenon lamp was placed at a position 30 cm above the test specimen, and the test specimen was irradiated with light. After 1 hour, the temperature of the test specimen was measured.

[0104]

Claims

1. A substrate with a coating layer, comprising a substrate and a coating layer coating the substrate, The coating layer is The composition includes a polyurea, which is a reaction product of an isocyanate component and an amine component, and a fire retardant. the isocyanate component comprises an aliphatic polyisocyanate; The amine component includes polyamine (a), which is at least one selected from the group consisting of dimethylthiotoluenediamine, diaminodiphenylmethane, and aspartic acid ester amine. The coating material is The substrate is a molded product of a thermoplastic resin, The substrate is a facility piping, a drain pipe, a drain basin, a drain cover, an electric wire piping or a joint. Substrate with a coating layer.

2. The substrate with a coating layer described in claim 1, wherein the fire-resistant agent is a mixture containing microcapsules in which ammonium polyphosphate powder is coated with resin, a melamine compound powder, and a pentaerythritol compound powder.

3. The substrate with a coating layer as described in claim 1, wherein the coating material contains at least one heat-shielding agent selected from the group consisting of hollow ceramic particles and white pigments.

4. The substrate with a coating layer as described in claim 1, wherein the thermoplastic resin is polyvinyl chloride.

5. A method comprising the steps of applying a coating composition to a substrate and curing the composition to form a coating layer, or forming an undercoat layer on the substrate; and A step of applying a coating composition to the undercoat layer and curing the composition to form a coating layer, The coating composition comprises: Contains an isocyanate component, an amine component, and a fire retardant, the isocyanate component comprises an aliphatic polyisocyanate; The amine component comprises at least one polyamine (a) selected from the group consisting of dimethylthiotoluenediamine, diaminodiphenylmethane, and aspartic acid ester amines; A coating composition, The substrate is a molded product of a thermoplastic resin, The substrate is a facility piping, a drain pipe, a drain basin, a drain cover, an electric wire piping or a joint. A method for producing a substrate with a coating layer.

6. A method for producing a substrate with a coating layer as described in claim 5, wherein the fire-resistant agent is a mixture containing microcapsules in which ammonium polyphosphate powder is coated with a resin, a melamine compound powder, and a pentaerythritol compound powder.

7. The method for producing a substrate with a coating layer described in claim 5, wherein the paint composition contains at least one heat-shielding agent selected from the group consisting of hollow ceramic particles and white pigments.

8. A method for producing a substrate with a coating layer as described in claim 5, wherein the paint composition contains a solvent.

9. A method for producing a substrate with a coating layer as described in claim 5, wherein the thermoplastic resin is polyvinyl chloride.