Coating composition, coating material, substrate with coated layer, 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

[Technical Field]

[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. [Background technology]

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

[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 vinyl chloride polymer is covered with an outer layer made of 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 compounding 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 resin 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 covering large surfaces (such as rooftops, the inner surfaces of underground pits, and tunnel walls) in a short time. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-254576 [Patent Document 2] Patent No. 4800815 [Patent Document 3] Japanese Patent Application Laid-Open No. 2008-180068 Summary of the Invention [Problem to be solved by the invention]

[0010] However, the techniques proposed in Patent Documents 1 to 3 leave 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 using an impingement mixing spray device to paint with polyurethane resin, unless the discharge pressure is increased, problems such as the paint not being mixed uniformly and the nozzle tip becoming clogged occur. However, if an attempt is made to spray polyurethane paint all at once at a relatively small substrate such as a pipe using a high discharge pressure, only a small amount of the 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 paint film, and in particular to form a thin, even film (for example, less than 1 mm).

[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. [Means for solving the problem]

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

[16] . [1] 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 amine; Paint composition.

[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] above, 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] 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. Covering material.

[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 described in [5] or [6] above.

[0020] [8] The substrate with a coating layer according to [7] above, 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] above, wherein the substrate is a molded product of a thermoplastic resin.

[0022]

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

[0023]

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

[10] above, wherein the substrate is a facility piping, a drainage pipe, a drainage pit, a drainage 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 any one of the coating compositions [1] to [4] above to a substrate and curing the composition to form a coating layer.

[0025]

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

[0026]

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

[12] or

[13] above, 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] above, wherein the thermoplastic resin is polyvinyl chloride.

[0028]

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

[14] or

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

[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. DETAILED DESCRIPTION OF THE INVENTION

[0030] The present invention will now be described in further detail. [Paint composition] The coating composition according to the present invention comprises 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 raw isocyanates are less susceptible to oxidation or deterioration (i.e., have superior weather resistance) than polyurea resins using aromatic isocyanates as raw isocyanates. 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 multimers such as dimers.

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

[0034] The aliphatic polyisocyanates 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 monoisocyanate or aromatic polyisocyanate, as long as the effects of the present invention are not impaired.

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

[0036] [ka]

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

[0039] [ka]

[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 kinds. A typical structural formula of an aspartic acid ester amine is as follows:

[0042] [ka]

[0043] R 1is preferably a linear, branched, or cyclic aliphatic group (preferably having 1 to 40 carbon atoms), 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 2 Examples of R include alkyl groups having 1 to 20 carbon atoms (preferably 1 to 8, more preferably 1 to 4) (such as 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 kinds.

[0046] Examples of commercially available polyamines (a) include DESMOPHEN (registered trademark) NH 1220, NH 1420, NH 1520, NH 1723LF, and NH2850XP, both of which are 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 by brush, roller, general-purpose airless spray, etc., and can also be used to coat molded articles with complex shapes and fine molded articles.

[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 contain a modified diethyl fumarate ester compound within the range that does not impair the effects of the present invention. The amine component is usually used in such a proportion 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. Ammonium polyphosphate is (NH4) 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, and melamine polyphosphate. 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 which 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 20:1-30.

[0063] The content of the heat-shielding agent is preferably 5 to 80 parts by mass, and more preferably 10 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.

[0064] <Solvent> The coating composition of the present invention may contain a solvent, which allows for more precise adjustment of 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, n-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, such as 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 described above. Furthermore, 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 that coats the substrate, and the coating layer is made of the coating material according to the present invention described above.

[0071] <Base material> The coating material according to the present invention is particularly effective for coating substrates made of thermoplastic resin moldings. 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, and among these molded products, those made of polyvinyl chloride are 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 desired.

[0072] Furthermore, when existing piping in a factory, facility, etc. deteriorates, replacing it with new piping requires halting operation of the factory, facility, etc., which not only incurs replacement costs but also damages associated with the halt in operation. However, by coating the deteriorated existing piping as a substrate with the coating composition of the present invention and then coating 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 having to stop 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 the 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 the adhesion between the substrate and the coating layer. The undercoat layer is preferably formed from a water-soluble undercoat paint, which is particularly preferred because it is less likely to cause problems such as corroding or dissolving the substrate or eluting components from 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 undercoat paint may also contain a leveling agent, a thickener, an antifoaming agent, etc., as required. The undercoat layer can be formed by applying an undercoat paint onto the substrate and drying and curing the formed coating film.

[0076] (Method of manufacturing substrate with coating layer) The method of producing a substrate with a coating 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 with a 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. [Example]

[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] [Manufacturing Example 1] A rigid polyvinyl chloride pipe (diameter: 100 mm, length: 1000 mm) that had been installed outdoors for 20 years was prepared, and a water-based epoxy resin paint was applied to its outer surface as a primer paint. The paint was then dried for 12 hours to form a primer layer, resulting in 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 paint composition 1. The isocyanate component and 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 paint composition 1 was 800 mPa s.

[0084] [Table 1]

[0085] Coating paint 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 paint 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, yielding a substrate with a coating layer.

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

[0087] [Table 2]

[0088] Coating paint 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 for coating film 2 formed from coating paint 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, yielding a substrate with a coating layer.

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

[0090] [Table 3]

[0091] Coating composition 3 was applied to the undercoat layer of the substrate with an undercoat layer produced in Production Example 1 using a general-purpose air spray within 30 minutes of preparation to a thickness of 400 μm. The tack-dry 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] [Table 4]

[0094] Coating composition 4 was applied to the undercoat layer of the substrate with an undercoat 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-dry 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, yielding 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 the "substrate with coating layer" in the "Test Results" section below) was prepared and not subjected to any treatment.

[0096] Comparative Example 2 Coating coating composition c2 was prepared by mixing 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). The viscosity of coating coating composition c2 was 400 mPa s.

[0097] The coating paint composition c2 was applied to the primer layer of the substrate with a primer layer produced in Production Example 1 with a brush within 30 minutes of 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 primer layer of the substrate with a primer layer produced in Production Example 1 within 30 minutes of preparation to a thickness of 400 μm, and 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 the coating layer 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] A 2 kg iron ball was dropped from a height of 1 m onto the outer surface of the fixed specimen, and the specimen was visually observed for damage.

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

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

[0104] [Table 5]

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 contains polyamine (a), which is at least one selected from the group consisting of dimethylthiotoluenediamine, diaminodiphenylmethane, and aspartic acid ester amine. The coating material comprises: the substrate is a molded product of a thermoplastic resin, The substrate is a facility piping, a drain pipe, a drain box, a drain cover, an electric wiring piping or a joint. Substrate with a coating layer.

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

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

5. A method comprising applying a coating composition to a substrate and curing the composition to form a coating layer; or forming a primer layer on the substrate; and a step of applying a coating composition to the undercoat layer and curing it 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 amine; A coating composition, the substrate is a molded product of a thermoplastic resin, The substrate is a facility piping, a drain pipe, a drain box, a drain cover, an electric wiring piping or a joint. Method for producing a substrate with a coating layer.

6. A method for manufacturing a substrate with a coating layer as described in Claim 5, wherein the fire-resistant agent consists of a mixture containing microcapsules formed by coating ammonium polyphosphate powder with resin, melamine compound powder, and pentaerythritol compound powder.

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

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