Coating composition and method for producing building material

Abstract

To provide a coating composition capable of forming a coating film having flame retardancy and suppressing excessive foaming of the coating film, and to provide a method for producing a building material.SOLUTION: The coating composition comprises a polyaminoamide, a polycondensation phosphoric acid ester and phosphoric acid, and forms a transparent coating film. In the method for manufacturing a base material, a first coating film is formed by applying a first coating composition including polyaminoamide, a condensation polymerized phosphoric acid ester, and phosphoric acid to a surface of a base material, a second coating film is formed on an upper layer of the first coating film by applying a second coating composition including polyaminoamide, a condensation polymerized phosphoric acid ester, and phosphoric acid, and a ratio of a content of the phosphoric acid to a content of the polyaminoamide is greater in the first coating composition than in the second coating composition.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to coating compositions and methods for producing building materials. [Background technology]

[0002] One method of making wood flame retardant is to impregnate wood with a flame retardant. This method of impregnating wood with a flame retardant is disclosed in Patent Document 1. One method of making plastic flame retardant is to change the composition of the plastic. This method of changing the composition of the plastic is disclosed in Patent Document 2. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-137805 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-273298 Summary of the Invention [Problem to be solved by the invention]

[0004] Special equipment is required to penetrate the wood with a flame retardant. It also takes a lot of time and energy to penetrate the wood with a flame retardant. In the case of the method of changing the composition of the plastic, the composition of the plastic is limited.

[0005] It is conceivable that a coating composition can be applied to a flammable substrate such as wood or plastic to form a coating film, which foams when heated and becomes a heat insulating layer.

[0006] When a building material is used on a ceiling or the like, excessive foaming of the coating film may cause the heat insulating layer to fall off, resulting in a decrease in flame retardancy. In one aspect of the present disclosure, it is preferable to provide a coating composition that can form a flame-retardant coating film and can prevent the coating film from foaming excessively, and a method for producing a building material. [Means for solving the problem]

[0007] One aspect of the present disclosure is a coating composition that contains a polyaminoamide, a condensation-polymerized phosphate ester, and phosphoric acid, and that forms a transparent coating film. The coating composition of one aspect of the present disclosure can form a coating film that has flame retardancy and can suppress excessive foaming of the coating film.

[0008] Another aspect of the present disclosure is a method for producing a building material, comprising: applying a first coating composition containing a polyaminoamide, a condensation polymerization phosphate ester, and phosphoric acid to the surface of a substrate to form a first coating film; and applying a second coating composition containing a polyaminoamide, a condensation polymerization phosphate ester, and phosphoric acid to form a second coating film above the first coating film, wherein the ratio of the phosphoric acid content to the polyaminoamide content is greater in the first coating composition than in the second coating composition.

[0009] A building material manufactured by the building material manufacturing method according to another aspect of the present disclosure has a coating film that is flame retardant and can suppress excessive foaming. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a side cross-sectional view showing the configuration of the building material. [Figure 2] 1 is a graph showing the infrared absorption spectrum of polyaminoamide A. [Figure 3] 1 is a graph showing the infrared absorption spectrum of Polyaminoamide B. [Figure 4] 1 is a graph showing the infrared absorption spectrum of polyaminoamide C. [Figure 5] 1 is a graph showing the infrared absorption spectrum of polyaminoamide D. DETAILED DESCRIPTION OF THE INVENTION

[0011] Exemplary embodiments of the present disclosure will now be described with reference to the drawings. First Embodiment 1. Coating composition The coating composition of the present disclosure comprises a polyaminoamide, a condensation polymerized phosphate ester, and phosphoric acid.

[0012] (1) Polyaminoamide Polyaminoamide is a general term for compounds having an amide bond and many amino and / or imino groups in the molecule. Polyaminoamides are used, for example, as curing agents for epoxy resins. In JIS K-6929-1 (Plastics - Curing agents and accelerators for epoxy resins - Part 1: Designated classification), polyaminoamides are classified as unmodified polyaminoamides and modified polyaminoamides. Polyaminoamides are compounds represented by the following formula (1):

[0013] [ka]

[0014] In formula (1), R is an amine skeleton. Examples of the amine skeleton include polyethylene polyamine. In formula (1), D is a polycarboxylic acid skeleton. Examples of the polycarboxylic acid skeleton include dimer acid. Polyaminoamides are generally synthesized by a dehydration condensation reaction between polycarboxylic acid and polyamine. The dehydration condensation reaction is carried out at a high temperature of, for example, 180°C or higher.

[0015] Polymerized fatty acids are mainly used as polycarboxylic acids. Polymerized fatty acids are mainly composed of dibasic acids of dicarboxylic acids derived from vegetable oils and fats. Examples of vegetable oils and fats include fatty acids obtained from tall oil, cottonseed oil, rapeseed oil, soybean oil, etc. Polymerized fatty acids are liquid fatty acids containing monobasic acids, tribasic acids, or higher bases. The structure of polycarboxylic acids is, for example, complex. Polycarboxylic acids include, for example, linear isomers, cyclic isomers, etc.

[0016] Polyaminoamides have reactive primary and secondary amino groups in their molecules. The molecular weight, viscosity, amine value, etc. of polyaminoamides vary depending on the production conditions of the polyaminoamides. Examples of the production conditions of polyaminoamides include the molar ratio of dimer acid to polyamine, the type of monomer acid in the fatty acid composition, the ratio of dimer acid to trimer acid, the type of polymer, and the number of functional groups. Dimer acid corresponds to dimeric fatty acid.

[0017] The polyamine is represented, for example, by the following formula (2).

[0018] [ka]

[0019] When n in formula (2) is 1, the polyamine is diethylenetriamine (DETA). The molecular weight of diethylenetriamine is 103. When n in formula (2) is 2, the polyamine is triethylenetetramine (TETA). The molecular weight of triethylenetetramine is 146.

[0020] When n in formula (2) is 3, the polyamine is tetraethylenepentamine (TEPA). The molecular weight of tetraethylenepentamine is 189. When n is 2 or more, the polyamine is not, for example, a linear amine of a single composition, but includes various isomers. When n is 2 or more, the polyamine has, for example, a ring structure.

[0021] The polyaminoamide may be an unmodified polyaminoamide in which no functional group has been introduced, or may be a modified polyaminoamide in which various functional groups have been introduced. When polyethylene polyamine is used as a raw material for the polyaminoamide, an imidazoline ring is generated in the molecule by further proceeding with a dehydration condensation reaction after the generation of the amide group.

[0022] Polyaminoamides having a large number of amide groups per unit mass are preferred. The amide group is —CO—NH— in formula (2). By using polymerized fatty acids with a high content of polymers, polyaminoamides having a large number of amide groups per unit mass can be produced.

[0023] For the production of polyaminoamide, it is preferable to use a polymerized fatty acid in which the content of trimers and tetramers in the polymerized fatty acid is 5 to 75 mass%, and it is more preferable to use a polymerized fatty acid in which the content of trimers and tetramers in the polymerized fatty acid is 10 to 35 mass%.

[0024] As the polyaminoamide, a polyaminoamide having few introduced functional groups or imidazoline rings is preferred. As the polyaminoamide, an unmodified polyaminoamide having no functional groups other than polycarboxylic acid and polyamine is more preferred. The infrared absorption spectrum of a polyaminoamide suitable for the coating composition of the present disclosure is shown in Figure 1.

[0025] Examples of commercially available polyaminoamides include Ancamide 2353 (manufactured by Air Products, modified alicyclic polyaminoamide) and Ancamide 2396A (manufactured by Air Products, modified alicyclic polyaminoamide).

[0026] Commercially available polyaminoamides include, for example, TOMIDE 210 (amine value 100, semi-solid), TOMIDE 215X (amine value 220, viscosity: 50,000 to 70,000 mPa·s / 40°C), TOMIDE 225X (amine value 300, 8,000 to 12,000 mPa·s / 40°C), TOMIDE 2500 (amine value 330, 500 to 1,000 mPa·s / 25°C), and TOMIDE 296 (amine value 410 to 440, viscosity 3,000 to 6,000 mPa·s / 25°C). Examples include the Tomide series (manufactured by T&K TOKA), such as Tomide 235-S (amine value 370 to 400, viscosity 4500 to 9000 mPa·s / 25°C), Tomide 2151 (amine value 235 to 365, viscosity: 4000 to 7500 mPa·s / 25°C), Tomide TXE-448 (amine value 415 to 445, viscosity 10000 to 25000 mPa·s / 25°C), and Tomide TXA-445 (amine value 415 to 440, viscosity 2000 to 5000 mPa·s / 25°C).

[0027] Commercially available polyaminoamide products include the Versamid series (manufactured by Henkel Hakusui Chemical Co., Ltd.), such as Versamid 100 (amine value 90, semi-solid), Versamid 115 (amine value 240), Versamid 125 (amine value 345, 7500 to 10000 mPa·s / 40°C), and Versamid 230 (polyamide adduct, amine value 125, 60% xylene / butanol solution).

[0028] Commercially available polyaminoamide products include, for example, the Zenamide series (manufactured by Henkel Japan) such as Zenamide 250 (amine value 440, 500 to 1000 mPa·s / 25° C.) and Zenamide 2000 (amine value 600, 1000 to 2500 mPa·s / 25° C.).

[0029] Commercially available polyaminoamide products include the Luckamide series (manufactured by DIC Corporation), such as Luckamide N-153 M 65 (amine value 100, 65% xylene / butanol solution), Luckamide TD966 (amine value 170, 60% xylene / butanol solution), and Luckamide TD973 (polyamine adduct, amine value 170, 60% xylene / butanol solution).

[0030] Commercially available polyaminoamide products include, for example, the Sanmide series (manufactured by Sanwa Chemical Co., Ltd.), such as Sanmide 300 (amine value 90, semi-solid), Sanmide 306 (amine value 210, 50,000 to 70,000 mPa·s / 40°C), Sanmide 316 (amine value 310, 9,000 to 11,000 mPa·s / 40°C), and Sanmide X-2000 (amine value 400, 1,000 to 3,000 mPa·s / 25°C).

[0031] Commercially available polyaminoamide products include, for example, the Polymide series (manufactured by Sanyo Chemical Industries), such as Polymide L-10-3 (amine value 100, semi-solid) and Polymide L-55-3 (amine value 380, 950 to 2550 mPa·s / 20° C.).

[0032] Commercially available polyaminoamide products include, for example, the Vegichem Green series (manufactured by Tsuno Group Co., Ltd.), such as Vegichem Green V1460 (amine value 560 to 620, viscosity 5000 mPa·s / 25° C.).

[0033] Commercially available polyaminoamide products include, for example, the Epomic series (manufactured by Mitsui Petrochemical Industries, Ltd.), such as Epomic Q-651, Q-652, Q-654, and Q-655. Commercially available polyaminoamide products include, for example, the Daitoclar series (manufactured by Daito Sangyo Co., Ltd.), such as Daitoclar P-1043, P-4115, P-4250, and P-4730.

[0034] Commercially available polyaminoamide products include, for example, the Goodmide series (manufactured by Tohto Kasei Co., Ltd.), such as Goodmide G-700, G-715, G-715B, G-720, G-725, G-730, G-740A, G-623, G-624, G-625A, G-645, and G-535.

[0035] Commercially available polyaminoamide products include, for example, the Sumicure series (manufactured by Sumitomo Chemical Co., Ltd.), such as Sumicure P-245, P-250, P-290C, P-624, P-625, P-715B, P-740A, and FH-10.

[0036] Commercially available polyaminoamide products include, for example, the ADEKA Hardener EH series (manufactured by ADEKA Corporation), such as ADEKA Hardener EH-203, EH-204R, EH-206, EH-207, EH-209, EH-335, EH-4602 (amine value 800, viscosity 1200 mPa·s / 25°C), EH-2300 (amine value 440, viscosity 3000 mPa·s / 25°C), and EH-4024W (amine value 200, viscosity 1000 mPa·s / 25°C).

[0037] Commercially available polyaminoamides include Ancamide 910 (manufactured by Air Products Co., Ltd.). Ancamide 910 is a polyaminoamide obtained by modifying polyoxyalkylene polyamine with polycarboxylic acid. Ancamide 910 is a polyaminoamide obtained by modifying diethylene glycol diaminopropyl ether with dimer acid.

[0038] (2) Polycondensed phosphate ester Polycondensation phosphate esters are esters obtained by the condensation reaction of polyphosphoric acid with alcohols, such as aliphatic alcohols, glycols, polyhydric alcohols, and glycerin.

[0039] Examples of aliphatic alcohols include methanol, ethanol, butanol, and propanol. Examples of glycols include ethylene glycol and propylene glycol. Examples of polyhydric alcohols include pentaerythritol, dipentaerythritol, and tripentaerythritol.

[0040] The condensation polymerized phosphate ester is preferably a condensation polymerized phosphate ester obtained using a polyhydric alcohol. When the coating composition contains a condensation polymerized phosphate ester obtained using a polyhydric alcohol, the flame retardancy of the substrate and the transparency of the coating film become even more pronounced. The condensation polymerized phosphate ester is more preferably a condensation polymerized phosphate ester obtained using pentaerythritol. When the coating composition contains a condensation polymerized phosphate ester obtained using pentaerythritol, the flame retardancy of the substrate and the transparency of the coating film become even more pronounced.

[0041] (3) Phosphoric acid When a coating composition contains an excess amount of phosphoric acid relative to the polyaminoamide, the excess phosphoric acid chemically bonds with the hydroxyl groups of the substrate, improving adhesion between the coating film and the substrate.When the substrate is wood, the phosphoric acid chemically bonds with the hydroxyl groups of cellulose.

[0042] (4) Glass fiber The coating composition further contains, for example, glass fiber. The glass fiber is, for example, in the form of powder. When the coating composition contains glass fiber, the shape retention of the heat insulating layer after heat foaming is improved. The diameter of the glass fiber is preferably 5 μm or more and 20 μm or less, and more preferably 10 μm.

[0043] The length of the glass fiber is preferably 50 μm or more and 300 μm or less. The aspect ratio of the glass fiber is the value obtained by dividing the length of the glass fiber by the diameter of the glass fiber. The aspect ratio of the glass fiber is preferably 5 or more and 20 or less.

[0044] Glass fiber is sometimes called powder or milled. Preferably, the glass fiber is not surface-treated. Commercially available glass fiber products include milled fiber (Central Glass Fiber Co., Ltd.), milled fiber (Asahi Fiber Glass Co., Ltd.), PF cut fiber (Nitto Boseki Co., Ltd.), and milled fiber (Nippon Electric Glass Co., Ltd.).

[0045] (5) Kaolin The coating composition further contains, for example, kaolin. As the kaolin, halloysite (Al2Si2O5(OH)4·2H2O) is preferred. Halloysite has a tubular crystal structure. Halloysite has siloxane (-Si-O-Si-) on the outside and aluminol (-Al-O-Al-) on the inside. Therefore, the surface of halloysite is acidic.

[0046] When the coating composition contains kaolin, the coating composition hardens faster. When the coating composition contains halloysite, the coating composition hardens even faster. The particle size of the kaolin is preferably 1 μm or more and 10 μm or less. When the particle size of the kaolin is 1 μm or more and 10 μm or less, the coating composition hardens even faster.

[0047] (6) First paint composition The coating composition of the present disclosure includes a first coating composition. The first coating composition is applied to the surface of a substrate 3 to form a first coating film 5, which will be described later. The first coating composition preferably contains 100 to 500 parts by mass of a condensation polymerization phosphate ester, and more preferably 333 parts by mass of a condensation polymerization phosphate ester, per 100 parts by mass of polyaminoamide. In this case, the flame retardancy of a building material 1, which will be described later, is further improved.

[0048] The first coating composition preferably contains 20 to 200 parts by mass of phosphoric acid per 100 parts by mass of polyaminoamide, and more preferably 62.5 parts by mass of phosphoric acid, which further improves the flame retardancy of the building material 1 described below.

[0049] The first coating composition preferably contains 50 to 250 parts by mass of water, and more preferably 83 parts by mass of water, per 100 parts by mass of polyaminoamide, which provides excellent coating workability.

[0050] The viscosity of the polyaminoamide contained in the first coating composition is preferably 2500 to 10000 mPa·s / 25° C. In this case, coating workability is excellent.

[0051] (7) Second paint composition The coating composition of the present disclosure includes a second coating composition. By applying the second coating composition, a second coating film 7 can be formed above the first coating film 5. The upper layer is the layer located farther from the substrate 3.

[0052] The second coating composition preferably contains 15 to 350 parts by mass of condensation polymerization phosphate ester, and more preferably 140 parts by mass of condensation polymerization phosphate ester, per 100 parts by mass of polyaminoamide, which further improves the flame retardancy of the building material 1.

[0053] The second coating composition preferably contains 10 to 50 parts by mass of phosphoric acid, and more preferably 25 parts by mass of phosphoric acid, per 100 parts by mass of polyaminoamide, which further improves the flame retardancy of the building material 1.

[0054] The second coating composition preferably contains 50 to 200 parts by mass of glass fiber per 100 parts by mass of polyaminoamide, and more preferably 100 parts by mass of glass fiber, which further improves the shape retention of the heat insulating layer after heat foaming.

[0055] The second coating composition preferably contains 0.5 to 10 parts by mass of a surfactant, and more preferably 5 parts by mass of a surfactant, per 100 parts by mass of polyaminoamide, which can suppress the settling of glass fibers.

[0056] The second coating composition preferably contains 1 to 10 parts by mass of kaolin per 100 parts by mass of polyaminoamide, and more preferably 5 parts by mass of kaolin, which allows the second coating composition to cure more quickly.

[0057] The second coating composition preferably contains 30 to 200 parts by mass of water, and more preferably 125 parts by mass of water, per 100 parts by mass of polyaminoamide, which provides excellent coating workability.

[0058] The viscosity of the polyaminoamide contained in the second coating composition is preferably 1,000 to 50,000 mPa·s / 25°C. This provides excellent coating workability. The amine value of the polyaminoamide contained in the second coating composition is preferably 100 to 600. This optimizes crosslinking through the acid-base reaction between the polyaminoamide and phosphoric acid, optimizing the foaming state of the coating film due to the heat of combustion in the event of a fire. In other words, the coating film is less likely to foam excessively, causing it to fall off, but foams to a degree that does not impair the insulation provided by the foam layer. The amine value represents the number of milligrams of perchloric acid and the equivalent amount of potassium hydroxide required to neutralize all basic nitrogen contained in 1 g of sample. The amine value is an absolute number. The method for measuring the amine value is specified in JIS K-7237 (Test method for total amine value of amine-based curing agents for epoxy resins).

[0059] (8) Phosphate / Polyaminoamide Ratio The ratio of the phosphoric acid content to the polyaminoamide content in a coating composition is hereinafter referred to as the phosphoric acid / polyaminoamide ratio. The units of the polyaminoamide content and the phosphoric acid content are parts by mass. The higher the phosphoric acid / polyaminoamide ratio, the higher the adhesion of the coating composition. The higher the phosphoric acid / polyaminoamide ratio, the higher the fire resistance of the coating film.

[0060] 2. Manufacturing method of building material 1 The building material 1 has, for example, the configuration shown in Fig. 1. The building material 1 includes a substrate 3, a first coating film 5, a second coating film 7, and a topcoat coating film 9. Examples of the substrate 3 include wood, plastic, wooden building materials, paper, and cloth. Examples of plastics include polyethylene resin, polypropylene resin, acrylic resin, phenolic resin, polyvinyl chloride resin, and expanded polystyrene resin.

[0061] Examples of wooden building materials include lumber, laminated lumber, plywood, laminated veneer lumber (LVL), cross-laminated timber (CLT), and medium-density fiberboard (MDF). The form of the substrate 3 is not particularly limited. Examples of the form of the substrate 3 include a pillar, a board, a sheet, and a cloth. Examples of the substrate 3 include wooden structural members. Examples of wooden structural members include pillars, beams, walls, and floors.

[0062] In the manufacturing method of the building material 1 of the present disclosure, a first coating film 5 is formed by applying a first coating composition containing a polyaminoamide, a condensation-polymerized phosphate ester, and phosphoric acid to the surface of a substrate 3. The polyaminoamide and phosphoric acid contained in the first coating composition crosslink through an acid-base reaction to form the first coating film 5. When heated, the first coating film 5 foams and becomes a heat insulating layer.

[0063] After the first coating film 5 is formed, a second coating film 7 is formed above the first coating film 5 by applying a second coating composition containing a polyaminoamide, a condensation-polymerized phosphate ester, and phosphoric acid. The polyaminoamide and phosphoric acid contained in the second coating composition crosslink through an acid-base reaction to form the second coating film 7. When heated, the second coating film 7 foams and becomes a heat-insulating layer. The second coating film 7 is in contact with the first coating film 5, for example.

[0064] The phosphoric acid / polyaminoamide ratio is greater in the first coating composition than in the second coating composition, i.e., the phosphoric acid / polyaminoamide ratio in the first coating composition is greater than the phosphoric acid / polyaminoamide ratio in the second coating composition.

[0065] In this case, the mass per unit area of ​​the total coating film required to achieve the same fire protection performance can be reduced compared to when the phosphoric acid / polyaminoamide ratios in the first and second coating compositions are the same. This is because the oxygen blocking effect of phosphoric acid is dominant in the first coating composition, while the insulating effect of foaming is dominant in the second coating composition. The mass per unit area of ​​the total coating film is the sum of the mass per unit area of ​​the first coating film 5 and the mass per unit area of ​​the second coating film 7.

[0066] The topcoat coating film 9 provides effects such as improved design, matte finish, coloring, and scratch resistance. The topcoat coating film 9 can be formed by applying a topcoat paint composition. The topcoat coating film 9 is in contact with, for example, the second coating film 7. The topcoat paint composition contains, for example, a synthetic resin. Examples of synthetic resins include acrylic resins, urethane resins, and other synthetic resins used in ordinary paints. Preferred synthetic resins are those with low water vapor permeability, such as vinyl chloride resins and vinylidene chloride resins. When a synthetic resin with low water vapor permeability is used, the moisture resistance and water resistance of the first coating film 5 and the second coating film 7 can be improved. The topcoat paint composition contains, for example, the following components:

[0067] Vinyl chloride-vinyl acetate copolymer resin: 10 parts by mass Ethyl acetate: 45 parts by mass Butyl acetate: 45 parts by mass

[0068] The composition of the second coating composition is as follows, and the mass per unit area of ​​the second coating film 7 is 180 to 280 g / m 2 In this case, the total calorific value of the second coating film 7 is 8 MJ / m 2 The total calorific value is measured using the cone calorimeter method specified in ISO 5660-1, with the test specimen measured at 50 kW / m 2 This method involves heating for 5 minutes at a radiation intensity of 1000kJ / s.

[0069] (Composition of second coating composition) Polyaminoamide: 100 parts by mass Polycondensation phosphate ester: 15 to 350 parts by mass Phosphoric acid: 10 to 50 parts by mass Glass fiber: 50 to 200 parts by mass Surfactant: optional Kaolin: 1 to 10 parts by mass Water: optional

[0070] When the compositions of the first coating composition and the second coating composition and the masses per unit area of ​​the first coating film 5 and the second coating film 7 are as follows, the total calorific value of the first coating film 5 and the second coating film 7 is 8 MJ / m2 The total calorific value is measured using the cone calorimeter method specified in ISO 5660-1, with the test specimen measured at 50 kW / m 2 This method involves heating for 10 minutes at a radiation intensity of 10 ...

[0071] (Composition of first coating composition) Polyaminoamide: 100 parts by mass Polycondensation phosphate ester: 100 to 500 parts by mass Phosphoric acid: 20 to 200 parts by mass Water: optional (Composition of second coating composition) Polyaminoamide: 100 parts by mass Polycondensation phosphate ester: 15 to 350 parts by mass Phosphoric acid: 10 to 50 parts by mass Glass fiber: 50 to 200 parts by mass Surfactant: optional Kaolin: 1 to 10 parts by mass Water: optional Mass per unit area of ​​first coating film 5: 20 to 100 g / m 2 Mass per unit area of ​​second coating film 7: 200 to 300 g / m 2 Mass per unit area of ​​the first coating film 5 and the second coating film 7: 250 to 350 g / m 2

[0072] 3. Effects of the coating composition and the method for manufacturing the building material 1 (1A) The coating film formed by applying the coating composition foams when heated in the event of a fire, forming a heat insulating layer, and therefore the coating film has flame retardancy.

[0073] (1B) The coating film formed by applying the coating composition is less likely to foam excessively even when heated during a fire, so the heat insulating layer is less likely to fall off during a fire. (1C) The coating film formed by applying the coating composition is unlikely to foam excessively. Therefore, unlike the technique described in JP 2023-014640 A, it is not necessary to embed glass fibers in the coating film. As a result, the manufacturing of the building material 1 is easy.

[0074] (1D) The coating film formed by applying the coating composition has high water resistance. In addition, the coating film formed by applying the coating composition is less likely to absorb water and turn white. (1E) The coating composition may be free of melamine resin, for example, which makes it difficult for formaldehyde to remain in the coating film.

[0075] (1F) The first coating film 5 and the second coating film 7 are transparent films. Therefore, for example, if the substrate 3 is made of wood, the wood grain of the substrate 3 can be seen through the first coating film 5 and the second coating film 7.

[0076] <Example> 1. Manufacturing of building materials 1 Building materials 1 were manufactured in Examples 1 to 14 and Comparative Examples 1 to 6. The manufacturing method for the building materials 1 was as follows: A rectangular board-shaped cedar laminated lumber was prepared as the base material 3. The dimensions of the base material 3 were 99 mm long, 99 mm wide, and 30 mm thick.

[0077] A first coating composition was applied to the surface of the substrate 3 to form a first coating film 5. Next, a second coating composition was applied on top of the first coating film 5 to form a second coating film 7. Next, a topcoat coating composition was applied on top of the second coating film 7 to form a topcoat coating film 9.

[0078] However, in Examples 1 to 4 and Comparative Examples 1 and 2, the first coating composition was not applied, and a first coating film 5 was not formed. In Examples 1 to 4 and Comparative Examples 1 and 2, a second coating composition was applied to the surface of the substrate 3, and a second coating film 7 was formed. In Examples 2 and 9, a topcoat coating composition was not applied, and a topcoat coating film 9 was not formed.

[0079] The compositions of the first coating composition, second coating composition, and topcoat coating composition are shown in Tables 1 and 2. The blending amount of each blending component in the first coating composition, second coating composition, and topcoat coating composition is expressed in parts by mass.

[0080] [Table 1]

[0081] [Table 2]

[0082] The polyaminoamide A in Tables 1 and 2 was a Sanpute underwater curing agent manufactured by Sanshosha. The polyaminoamide A had the infrared absorption spectrum shown in Figure 2. The amine value of the polyaminoamide A was 430. The viscosity of the polyaminoamide A was 15,000 mPa·s / 25°C.

[0083] The polyaminoamide B in Tables 1 and 2 was Sanpita Epo Soft curing agent manufactured by Sanshosha. The polyaminoamide B had the infrared absorption spectrum shown in Figure 3. The amine value of polyaminoamide B was 300. The viscosity of polyaminoamide B was 5000 mPa·s / 25°C.

[0084] The polyaminoamide C in Tables 1 and 2 was Sanpita Epoxy Winter Hardener manufactured by Sanshosha. The polyaminoamide C had the infrared absorption spectrum shown in Figure 4. The amine value of the polyaminoamide C was 380. The viscosity of the polyaminoamide C was 6000 mPa·s / 25°C.

[0085] The polyaminoamide D in Tables 1 and 2 was Sanpita Epoxy heat-resistant curing agent manufactured by Sanshosha. The polyaminoamide D had the infrared absorption spectrum shown in Figure 5. The amine value of the polyaminoamide D was 430. The viscosity of the polyaminoamide D was 7500 mPa·s / 25°C.

[0086] The diameter of the glass fiber in Tables 1 and 2 was 10 μm and the length of the glass fiber was 100 μm. The surfactant in Tables 1 and 2 was a nonionic polyether surfactant. The defoamer in Tables 1 and 2 was a silicone-based defoamer.

[0087] The first coating composition, the second coating composition, and the topcoat coating composition were manufactured by mixing and stirring the components. The first coating composition, the second coating composition, and the topcoat coating composition were applied by roller coating. The masses per unit area of ​​the first coating film 5, the second coating film 7, and the topcoat coating film 9 are shown in Tables 1 and 2.

[0088] 2. Evaluation of Building Materials 1 Tests were carried out on the building materials 1 of each example and each comparative example. The test specimens were subjected to a 50 kW / m 2 The total heat release amount and maximum heat release rate were measured when heated for a predetermined time at a radiation intensity of 1000 kJ / cm2. The heating time was 5 minutes for Examples 1 to 7 and Comparative Examples 1 to 3. The heating time was 10 minutes for Examples 8 to 14 and Comparative Examples 4 to 6. The measured values ​​were applied to the following evaluation criteria to evaluate flame retardancy. The evaluation results are shown in Tables 1 and 2.

[0089] (Evaluation criteria for flame retardancy based on total heat generation) ◎: 4MJ / m 2 below 〇:4MJ / m 2 exceeding 7.2MJ / m 2 below △: 7.2MJ / m 2 exceeding 8MJ / m 2 below ×:8MJ / m 2 super (Flame retardancy rating based on maximum heat release rate) 〇: 180kW / m 2 below △: 180kW / m 2 Exceeding 200kW / m 2 below ×:200kW / m 2 super

[0090] Furthermore, when performing the cone calorimeter method, an igniter was placed above the test specimen. When the first coating film 5 and the second coating film 7 foamed, it was observed whether the uppermost coating film came into contact with the igniter. Based on the observation results, the foaming suppression effect was evaluated according to the following criteria. The evaluation results are shown in Tables 1 and 2. Note that if the first coating film 5 and the second coating film 7 foam excessively, the uppermost coating film is likely to come into contact with the igniter.

[0091] (Evaluation criteria for foam suppression effect) ○: The topmost coating film does not come into contact with the igniter. △: The uppermost coating film comes into contact with the igniter, but the contact time is within 10 seconds. ×: The uppermost coating film comes into contact with the igniter, and the contact time exceeds 10 seconds.

[0092] Furthermore, Building Material 1 was visually observed, and the transparency of all coating films on Building Material 1 was evaluated according to the following criteria. The evaluation results are shown in Tables 1 and 2.

[0093] (Transparency evaluation criteria) ◯: The wood grain of the base material 3 is visible through the entire coating film of the building material 1. △: The wood grain of the base material 3 is visible through the entire coating film of the building material 1 in a blurred manner. ×: The wood grain of the base material 3 is not visible.

[0094] Furthermore, Building Material 1 was left to stand in a thermo-humidistat chamber at 30°C and 90% RH for two weeks, after which the appearance of Building Material 1 was visually observed. The moisture resistance was evaluated according to the following criteria. The evaluation results are shown in Tables 1 and 2. (Evaluation criteria for moisture resistance) ◯: The wood grain of the base material 3 is visible through the entire coating film of the building material 1. △: The wood grain of the base material 3 is visible through the entire coating film of the building material 1 in a blurred manner. ×: The wood grain of the base material 3 is not visible. For the building material 1 of each example, all evaluation results were good. For the building material 1 of each comparative example, one of the evaluation results was bad.

[0095] <Other embodiments> Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be implemented in various modified forms.

[0096] (1) For example, another coating film may be formed between the substrate 3 and the first coating film 5. Also, for example, another coating film may be formed between the first coating film 5 and the second coating film 7. (2) When producing the building material 1, the first coating composition and the second coating composition may be the same. (3) The function of one component in each of the above embodiments may be shared among multiple components, or the functions of multiple components may be performed by one component. Also, part of the configuration of each of the above embodiments may be omitted. Furthermore, at least part of the configuration of each of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. (4) In addition to the above-described coating composition, the present disclosure can also be realized in various forms, such as a product containing the coating composition as a component, a method for producing the coating composition, and a building material. [Explanation of symbols]

[0097] 1...building material, 3...base material, 5...first coating film, 7...second coating film, 9...top coating film

Claims

1. The composition comprises a polyaminoamide, a condensation polymerized phosphate ester, and phosphoric acid, Forms a transparent coating Paint composition.

2. The coating composition of claim 1, The composition contains 15 parts by mass or more and 350 parts by mass or less of a condensation-polymerized phosphate ester and 10 parts by mass or more and 50 parts by mass or less of phosphoric acid relative to 100 parts by mass of polyaminoamide. Paint composition.

3. a first coating film is formed by applying a first coating composition containing a polyaminoamide, a condensation-polymerized phosphate ester, and phosphoric acid to a surface of a substrate; a second coating composition containing a polyaminoamide, a condensation-polymerized phosphate ester, and phosphoric acid is applied to form a second coating film on top of the first coating film; The ratio of the content of phosphoric acid to the content of polyaminoamide is greater in the first coating composition than in the second coating composition. Manufacturing methods for building materials.

4. A method for manufacturing a building material according to claim 3, The second coating composition contains 15 parts by mass or more and 350 parts by mass or less of a condensation-polymerized phosphate ester and 10 parts by mass or more and 50 parts by mass or less of phosphoric acid relative to 100 parts by mass of a polyaminoamide. Manufacturing methods for building materials.

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