Manufacturing method for painted articles

Abstract

To provide a coated article which exhibits excellent water repellency and antifouling property, and is excellent in durability of these performances.SOLUTION: A method for manufacturing a coated article includes a step of applying a primer onto the surface of an organic base material, a step of applying a water-repellent anti-fouling agent onto the surface of the organic base material to which the primer is imparted, and a step of fixing the primer and the water-repellent anti-fouling agent to the surface of the organic base material, wherein the primer contains a hydroxyl group-containing resin and a polyisocyanate compound, the water-repellent anti-fouling agent contains a polysiloxane compound having a reactive group capable of reacting with an isocyanate group at one terminal and a hydrophobic group unreactive with the isocyanate group at the other end, and the fixing step reacts the isocyanate group possessed by the polyisocyanate compound, the hydroxyl group possessed by the hydroxyl group-containing resin and the reactive group possessed by the polysiloxane compound.SELECTED DRAWING: None

Description

[Technical Field]

[0001] This invention relates to a method for manufacturing painted articles. [Background technology]

[0002] Conventionally, water-repellent and stain-resistant agents containing polysiloxane compounds are known. For example, Patent Document 1 discloses a coating agent containing a double-ended reactive silicone oil. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Patent No. 4698541 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] The water-repellent and stain-resistant properties of the coating agent described in Patent Document 1 tend to decrease easily.

[0005] The present invention aims to solve the above problems and to provide a coated article that exhibits excellent water repellency and stain resistance, and has excellent durability of these properties. [Means for solving the problem]

[0006] To solve the above problems, the present invention provides the following embodiments. [1] A step of applying a primer to the surface of an organic substrate, A step of applying a water-repellent and stain-resistant agent to the surface of the organic substrate to which the primer has been applied, The process includes fixing the primer and the water-repellent and stain-resistant agent to the surface of the organic substrate, The primer comprises a hydroxyl group-containing resin and a polyisocyanate compound. The water-repellent and stain-repellent agent comprises a polysiloxane compound having a reactive group at one end that can react with an isocyanate group and a hydrophobic group at the other end that is inactive with an isocyanate group. A method for producing a coated article, wherein in the fixing step, the isocyanate group of the polyisocyanate compound reacts with the hydroxyl group of the hydroxyl group-containing resin and the reactive group of the polysiloxane compound.

[0007] [2] The surface treatment agent according to [1] above, wherein the equivalent ratio (NCO / OH) of the isocyanate group of the polyisocyanate compound to the hydroxyl group of the hydroxyl group-containing resin is greater than 1.0.

[0008] [3] The surface treatment agent according to [1] above, wherein the reactive group is at least one of a hydroxyl group and an amino group.

[0009] [4] The polysiloxane compound is the surface treatment agent according to [1] above, wherein the polysiloxane compound has two or more of the reactive groups at one of its terminal ends.

[0010] [5] The polyisocyanate compound is the surface treatment agent described in [1] above, having an aromatic hydrocarbon group.

[0011] [6] The hydroxyl group-containing resin has a hydroxyl value of 220 mg KOH / g or more and 600 mg KOH / g or less, as described in [1] above.

[0012] [7] The method for manufacturing a painted article according to [1] above, wherein at least one of the primer and the water-repellent and antifouling agent further comprises at least one of an antibacterial agent and an antiviral agent.

[0013] [8] The method for manufacturing a coated article according to [1] above, wherein the hydroxyl group-containing resin includes a hydroxyl group-containing polyester resin.

[0014] [9] The organic substrate is the method for manufacturing the coated article according to [1] above, including fiber reinforced plastic.

[0015]

[10] The organic substrate is an organic substrate that forms at least a part of at least one of the members used in housing equipment and the members used in buildings. The member used in the housing equipment is at least one selected from the group consisting of a bathtub, a bathroom wall, a bathroom counter, and a washstand. The member used in the building is at least one of siding materials and carports, and is the method for manufacturing the coated article according to [1] above.

Effect of the Invention

[0016] According to the present invention, it is possible to provide a coated article that exhibits excellent water repellency and antifouling properties and has excellent durability of these properties.

Mode for Carrying Out the Invention

[0017] [Method for Manufacturing Coated Article] The coated article according to the present disclosure is manufactured by a method including a step of applying a primer to the surface of an organic substrate, a step of applying a water repellent and antifouling agent to the surface of the organic substrate to which the primer has been applied, and a step of fixing the primer and the water repellent and antifouling agent to the surface of the organic substrate.

[0018] The primer includes a hydroxyl group-containing resin and a polyisocyanate compound. The water repellent and antifouling agent includes a polysiloxane compound having a reactive group capable of reacting with an isocyanate group at one end and a hydrophobic group non-reactive with the isocyanate group at the other end.

[0019] In the fixing step, the isocyanate group of the polyisocyanate compound reacts with the hydroxyl group of the hydroxyl group-containing resin and the reactive group of the polysiloxane compound.

[0020] The method described herein imparts excellent water repellency and stain resistance to an organic substrate. Stain resistance refers to the property of being resistant to the adhesion of dirt, particularly mineral components such as calcium (limescale) that may be present in tap water, or the property of being easily removed if dirt adheres. Furthermore, the method described herein provides sustained water repellency and stain resistance. For example, even when painted articles are subjected to external loads such as exposure to water, cleaning with commercially available cleaning agents, or friction, the organic substrate exhibits excellent water repellency and stain resistance. Hereinafter, this property of sustained excellent water repellency and stain resistance will be referred to as durability.

[0021] The reasons for the improved water repellency, stain resistance, and durability are not entirely clear, but they may be as follows:

[0022] The polyisocyanate compound contained in the primer crosslinks hydroxyl group-containing resins to form a cured layer. This cured layer adheres closely to the organic substrate. Furthermore, the cured layer improves the chemical resistance and abrasion resistance of the painted article. The strong adhesion of the cured layer to the organic substrate, along with the high chemical resistance and abrasion resistance of the painted article, contributes to improved durability.

[0023] The isocyanate groups of the polyisocyanate compound that forms the cured layer react with the hydroxyl groups of the hydroxyl group-containing resin, as well as with the reactive groups of the polysiloxane compound contained in the water-repellent and antifouling agent that is applied later. As a result, the polysiloxane compound is fixed near the surface of the cured layer. The polysiloxane compound imparts water repellency and antifouling properties to the organic substrate. The uneven distribution of the polysiloxane compound near the surface of the cured layer allows the water repellency and antifouling properties to be exhibited more effectively.

[0024] Furthermore, the polysiloxane compound used in this disclosure has a reactive group at only one of its ends. Therefore, in the fixation process, the other end of the polysiloxane compound does not react with the polyisocyanate compound, and is fixed to the cured layer only at one end. In other words, since the other end of the polysiloxane compound is in a free state, external forces such as friction are less likely to be applied to the polysiloxane compound, and the detachment of the polysiloxane compound is suppressed. As a result, durability is improved.

[0025] In addition, since the primer and water-repellent / fouling-resistant agent are applied sequentially to the organic substrate, the cured layer formed by the primer is efficiently formed on the surface of the organic substrate. The polysiloxane compound applied later is efficiently fixed near the surface of this cured layer. It is believed that the water repellency, stain resistance, and durability of these properties are improved due to the combination of the factors mentioned above.

[0026] The water contact angle to the coated article according to this disclosure may be greater than 95° and may be 97° or greater. When the water contact angle is greater than 95°, the coated article can be said to have excellent water repellency. Excellent water repellency also provides stain resistance. The water contact angle can be measured in accordance with JIS R 3257 "Test method for wettability of substrate glass surface" (static droplet method).

[0027] (1) Primer application process A primer is applied to the surface of an organic substrate. The primer comprises a hydroxyl group-containing resin and a polyisocyanate compound. The primer may further contain a curing catalyst. The primer may further contain a solvent.

[0028] (organic base material) The organic substrate is formed from organic materials. The shape of the organic substrate is not particularly limited and may have a shape appropriate for its application. Examples of organic materials include thermoplastic resins, thermosetting resins, and elastomers. The organic materials may be used individually or in combination of two or more types.

[0029] Examples of thermoplastic resins include polyethylene, polypropylene, polyester, polyacrylic, polyvinyl chloride, and so-called engineering plastics. Examples of engineering plastics include polyamide, polyacetal, polycarbonate, ultra-high molecular weight polyethylene, polysulfone, polyethersulfone, polyphenylene sulfide, liquid crystal polymers, and polyetheretherketones.

[0030] Examples of thermosetting resins include phenolic resins, epoxy resins, melamine resins, urea resins, urethane resins, silicone resins, unsaturated polyesters, and thermosetting polyimides.

[0031] Examples of elastomers include styrene-butadiene block copolymer, styrene-acrylonitrile, acrylonitrile-butadiene-styrene (ABS), polystyrene, and acrylonitrile-styrene-acrylate.

[0032] The organic base material may contain fibers along with the organic material. The organic base material may also contain fiber-reinforced plastic (FRP) obtained by mixing thermoplastic resin and fibers.

[0033] Examples of fibers that can be mixed with organic materials include glass fibers, aramid fibers, carbon fibers, and cellulose fibers. The fibers can be used individually or in combination of two or more types.

[0034] FRP is molded using methods such as sheet molding compound (SMC), bulk molding compound (BMC), resin infusion (RIMP), and prepreg compression molding (PCM).

[0035] The organic substrate may form at least a part of at least one of the components used in residential equipment and components used in buildings. Examples of components used in residential equipment include at least one selected from the group consisting of bathtubs, bathroom walls, bathroom counters, and vanity units. Examples of components used in buildings include at least one of siding materials and carports.

[0036] (Primer) The primer comprises a hydroxyl group-containing resin and a polyisocyanate compound.

[0037] ≪Hydroxygroup-containing resin≫ A hydroxyl group-containing resin has one or more hydroxyl groups. Specific examples of hydroxyl group-containing resins include hydroxyl group-containing acrylic resins, hydroxyl group-containing polyester resins, hydroxyl group-containing polyether resins, and hydroxyl group-containing polyurethane resins. These can be used individually or in combination of two or more. Among these, hydroxyl group-containing acrylic resins and hydroxyl group-containing polyester resins are particularly suitable. Hydroxyl group-containing polyester resins are particularly suitable because they are easier to crosslink.

[0038] Hydroxyl group-containing polyester resins can be obtained, for example, by polycondensation (esterification reaction) of a polyhydric alcohol with a polybasic acid or its anhydride. Commercially available hydroxyl group-containing polyester resins may also be used.

[0039] Polyhydric alcohols are not particularly limited and include, for example, ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, neopentyl glycol, 1,2-butanediol, 1,3-butanediol, 2,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, hydrogenated bisphenol A, hydroxyalkylated bisphenol A, 1,4-cyclohexanedimethanol, 2,2-dimethyl- Examples include 3-hydroxypropyl-2,2-dimethyl-3-hydroxypropionate, 2,2,4-trimethyl-1,3-pentanediol, N,N-bis-(2-hydroxyethyl)dimethylhydantoin, polytetramethylene ether glycol, polycaprolactone polyol, glycerin, sorbitol, trimethylolethane, trimethylolpropane, trimethylolbutane, hexanetriol, pentaerythritol, dipentaerythritol, and tris-(hydroxyethyl)isocyanate. These can be used individually or in combination of two or more.

[0040] Polybasic acids or their anhydrides are not particularly limited and include, for example, phthalic acid, phthalic anhydride, tetrahydrophthalic acid, tetrahydrophthalic anhydride, hexahydrophthalic acid, hexahydrophthalic anhydride, methyltetrahydrophthalic acid, methyltetrahydrophthalic anhydride, hymic anhydride, trimellitic acid, trimellitic anhydride, pyromellitic acid, pyromellitic anhydride, isophthalic acid, terephthalic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, adipic acid, azelaic acid, sebacic acid, succinic acid, succinic anhydride, lactic acid, dodecenyl succinic acid, dodecenyl succinic anhydride, cyclohexane-1,4-dicarboxylic acid, and endo anhydride. These can be used individually or in combination of two or more.

[0041] The hydroxyl group-containing polyester resin may be modified using lactones, oils or fatty acids, melamine resin, urethane resin, etc. The oils or fatty acids are not particularly limited and include, for example, oils such as castor oil, dehydrated castor oil, coconut oil, corn oil, cottonseed oil, linseed oil, perilla oil, poppy oil, safflower oil, soybean oil, and tung oil, or fatty acids extracted from these oils.

[0042] The hydroxyl value of a hydroxyl group-containing resin is not particularly limited. From the viewpoint of coating film performance (especially water resistance), the hydroxyl value of the hydroxyl group-containing resin (a11) may be 220 mgKOH / g or more, 300 mgKOH / g or more, or 350 mgKOH / g or more. The hydroxyl value of the hydroxyl group-containing resin may be 600 mgKOH / g or less, 580 mgKOH / g or less, or 550 mgKOH / g or less. In one embodiment, the hydroxyl value of the hydroxyl group-containing resin (a11) is 220 mgKOH / g or more and 600 mgKOH / g or less. The hydroxyl value is calculated based on JIS K5601 2-1 Acid Value Measurement Method. Specifically, the hydroxyl value is the number of mg of potassium hydroxide (KOH) required to neutralize the free acid in 1 g of solid content of the hydroxyl group-containing resin.

[0043] The number-average molecular weight of the hydroxyl group-containing resin is, for example, 350 or more. This makes it easier to improve the hardness of the resulting coating film. The number-average molecular weight of the hydroxyl group-containing resin may be 500 or more. The number-average molecular weight of the hydroxyl group-containing resin is, for example, 4,000 or less. This makes it easier to suppress excessive viscosity increases of the primer and makes it easier to apply. The number-average molecular weight of the hydroxyl group-containing resin may be 2,000 or less. In one embodiment, the number-average molecular weight of the hydroxyl group-containing resin is 350 or more and 4,000 or less. The number-average molecular weight is a styrene homopolymer equivalent value measured using gel permeation chromatography.

[0044] The solid content concentration in the hydroxyl group-containing resin primer may be 0.1% by mass or more, or 1% by mass or more. This may further improve the durability of the coating film. The solid content concentration in the hydroxyl group-containing resin may be 10% by mass or less, or 7% by mass or less, or 5% by mass or less. This may improve the appearance of the coating film. In one embodiment, the solid content concentration in the hydroxyl group-containing resin primer is 0.1% by mass or more and 10% by mass or less.

[0045] Polyisocyanate compounds Polyisocyanate compounds have at least two isocyanate groups in one molecule. Examples of polyisocyanate compounds include aliphatic polyisocyanates, alicyclic polyisocyanates, polyisocyanates having aromatic hydrocarbon groups, and derivatives of these polyisocyanates. Examples of polyisocyanates having aromatic hydrocarbon groups include aliphatic polyisocyanates having aromatic rings in the molecule that are not bonded to isocyanate groups (aroliphatic polyisocyanates), and aromatic polyisocyanates having aromatic rings that are bonded to isocyanate groups.

[0046] Examples of polyisocyanate derivatives include the dimers, trimers, biuretes, allophanates, uretodiones, uretoimines, isocyanurates, oxadiazinetriones, polymethylene polyphenyl polyisocyanates (crude MDI, polymeric MDI), and crude TDI. Polyisocyanate compounds can be used individually or in combination of two or more.

[0047] In particular, polyisocyanates having aromatic hydrocarbon groups may be used, or aromatic aliphatic polyisocyanates may be used, as they tend to adhere well to organic substrates.

[0048] Examples of aliphatic polyisocyanates include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 1,2-butylene diisocyanate, 2,3-butylene diisocyanate, 1,3-butylene diisocyanate, 2,4,4- or 2,2,4-trimethylhexamethylene diisocyanate, dimer diisocyanate, and 2,6-methyl diisocyanatohexanoate (common name: lig Aliphatic diisocyanates such as diisocyanates (2,6-diisocyanatohexanoate 2-isocyanatoethyl, 1,6-diisocyanato-3-isocyanatomethylhexane, 1,4,8-triisocyanatooctane, 1,6,11-triisocyanatoundecane, 1,8-diisocyanato-4-isocyanatomethyloctane, 1,3,6-triisocyanatohexane, and 2,5,7-trimethyl-1,8-diisocyanato-5-isocyanatomethyloctane are examples of aliphatic triisocyanates.

[0049] Examples of alicyclic polyisocyanates include 1,3-cyclopentene diisocyanate, 1,4-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate (common name: isophorone diisocyanate), 4-methyl-1,3-cyclohexylene diisocyanate (common name: hydrogenated TDI), 2-methyl-1,3-cyclohexylene diisocyanate, 1 Alicyclic diisocyanates such as ,3- or 1,4-bis(isocyanatomethyl)cyclohexane (common name: hydrogenated xylylene diisocyanate), methylenebis(4,1-cyclohexanediyl) diisocyanate (common name: hydrogenated MDI), norbornane diisocyanate, 4,4'-methylenebis(cyclohexyl isocyanate); 1,3,5-triisocyanatocyclohexane, 1,3,5-trimethylisocyanatocyclohexane, 2-(3-I Socyanatopropyl)-2,5-di(isocyanatomethyl)-bicyclo(2.2.1)heptane, 2-(3-isocyanatopropyl)-2,6-di(isocyanatomethyl)-bicyclo(2.2.1)heptane, 3-(3-isocyanatopropyl)-2,5-di(isocyanatomethyl)-bicyclo(2.2.1)heptane, 5-(2-isocyanatoethyl)-2-isocyanatomethyl-3-(3-isocyanatopropyl)-bicyclo(2.2.1)heptane, Examples include alicyclic triisocyanates such as 6-(2-isocyanatoethyl)-2-isocyanatomethyl-3-(3-isocyanatopropyl)-bicyclo(2.2.1)heptane, 5-(2-isocyanatoethyl)-2-isocyanatomethyl-2-(3-isocyanatopropyl)-bicyclo(2.2.1)heptane, and 6-(2-isocyanatoethyl)-2-isocyanatomethyl-2-(3-isocyanatopropyl)-bicyclo(2.2.1)heptane.

[0050] Examples of aromatic aliphatic polyisocyanates include aromatic aliphatic diisocyanates such as methylenebis(4,1-phenylene) diisocyanate (common name: MDI), m- or p-xylylene diisocyanate, ω,ω'-diisocyanato-1,4-diethylbenzene, and 1,3- or 1,4-bis(1-isocyanato-1-methylethyl)benzene (common name: tetramethylxylylene diisocyanate); and aromatic aliphatic triisocyanates such as 1,3,5-triisocyanatomethylbenzene.

[0051] Examples of aromatic polyisocyanates include aromatic diisocyanates such as m-phenylenediisocyanate, p-phenylenediisocyanate, 4,4'-diphenylenediisocyanate, 1,5-naphthalenediisocyanate, 2,4-tolylenediisocyanate (common name: 2,4-TDI) or 2,6-tolylenediisocyanate (common name: 2,6-TDI) or mixtures thereof, 4,4'-toluidinediisocyanate, and 4,4'-diphenyletherdiisocyanate; aromatic triisocyanates such as triphenylmethane-4,4',4''-triisocyanate, 1,3,5-triisocyanatobenzene, and 2,4,6-triisocyanatotoluene; and aromatic tetraisocyanates such as 4,4'-diphenylmethane-2,2',5,5'-tetraisocyanate.

[0052] Polyisocyanate compounds are used individually or in combination of two or more.

[0053] As the polyisocyanate compound, a prepolymer of the above-mentioned polyisocyanate or its derivative may be used. The prepolymer is obtained by reacting the polyisocyanate or its derivative with a compound that can react with it under conditions of isocyanate group excess. The compound that can react with the polyisocyanate or its derivative is a compound having an active hydrogen group such as a hydroxyl group or an amino group. Examples of the above-mentioned compound include polyhydric alcohols, low molecular weight polyester resins, amines, and water.

[0054] The equivalent ratio (NCO / OH) of isocyanate groups in the polyisocyanate compound to hydroxyl groups in the hydroxyl group-containing resin may be greater than 1.0. A higher proportion of isocyanate groups makes the polyisocyanate compound more readily react with the polysiloxane compound that is subsequently added, which can further improve the durability of water-repellent and stain-resistant properties. The equivalent ratio (NCO / OH) may be 1.1 or higher, or 1.2 or higher. The equivalent ratio (NCO / OH) may be 3 or less, or 2 or less. In one embodiment, the equivalent ratio (NCO / OH) is 1.1 or higher and 3 or less.

[0055] The polyisocyanate compound and the hydroxyl group-containing resin are blended into the primer in a proportion such that the equivalent ratio: NCO / OH is greater than 1.0.

[0056] The solid content concentration in the polyisocyanate compound primer may be 0.1% by mass or more, or 1% by mass or more. This may improve the durability of the coating film. The solid content concentration in the polyisocyanate compound may be 10% by mass or less, or 7% by mass or less, or 5% by mass or less. This may improve the appearance of the coating film. In one embodiment, the solid content concentration in the polyisocyanate compound primer is 0.1% by mass or more, or 10% by mass or less.

[0057] ≪Curing catalyst≫ The primer may contain a curing catalyst. In the immobilization step, the curing catalyst promotes the reaction between the isocyanate groups of the polyisocyanate compound and the hydroxyl groups of the hydroxyl group-containing resin and the reactive groups of the polysiloxane compound.

[0058] From the viewpoint of promoting the curing effect, examples of curing catalysts include at least one organometallic catalyst containing a metal element selected from the group consisting of Bi, Zn, Al, Zr, and Sn.

[0059] Examples of organometallic catalysts containing Bi include bismuth carboxylic acid and its salts. Examples of organometallic catalysts containing Zn include zinc complex catalysts. Examples of organometallic catalysts containing Al include aluminum complex catalysts. Examples of organometallic catalysts containing Zr include zirconium chelate catalysts. Examples of organometallic catalysts containing Sn include dialkyltin dicarboxylates such as dibutyltin dilaurate, dioctyltin dilaurate, and dibutyltin diacetate; tin oxide compounds such as dibutyltin oxide; and tin carboxylate salts such as 2-ethylhexanoate tin.

[0060] The amount of curing catalyst added is, for example, 0.05 parts by mass or more, and may be 0.1 parts by mass or more, per 100 parts by mass of hydroxyl group-containing resin. This facilitates the above reaction, potentially improving water repellency, stain resistance, and its durability. The amount of curing catalyst added is, for example, 1 part by mass or less, and may be 0.5 parts by mass or less, per 100 parts by mass of hydroxyl group-containing resin. This can extend the pot life and improve convenience. In one embodiment, the amount of curing catalyst added is 0.05 parts by mass or more and 1 part by mass or less, per 100 parts by mass of hydroxyl group-containing resin.

[0061] Organic solvents Primers may contain organic solvents. Examples of organic solvents include hydrocarbons such as n-heptane, n-hexane, methylcyclohexane, xylene, and toluene; alcohols such as methyl alcohol, n-butyl alcohol, isopropyl alcohol, 2-ethylhexyl alcohol, ethylene glycol, and propylene glycol; ethers such as ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monohexyl ether, propylene glycol monoethyl ether, 3-methyl-3-methoxybutanol, diethylene glycol monoethyl ether, and diethylene glycol monobutyl ether; ketones such as methyl isobutyl ketone, cyclohexanone, isophorone, and acetylacetone; and esters such as ethylene glycol monoethyl ether acetate and ethylene glycol monobutyl ether acetate. These can be used individually or in combination of two or more.

[0062] <<Antibacterial and antiviral agents>> The primer may contain at least one of an antibacterial agent and an antiviral agent. This can impart antibacterial and / or antiviral properties to the painted article.

[0063] The antibacterial and / or antiviral agents may be inorganic or organic. From the viewpoint of durability, they may be inorganic.

[0064] Examples of inorganic antibacterial and / or antiviral agents include elemental metals, metal salts, metal oxides, and metal hydrates. Examples of metal species include Cu (copper) and Zn (zinc), Ti (titanium), Pt (platinum), Ag (silver), Au (gold), Co (cobalt), and Ni (nickel). These can be used individually or in combination of two or more.

[0065] Inorganic antimicrobial and / or antiviral agents may be supported on particulate carriers. Examples of carriers include glass, silicon dioxide, titanium dioxide, silicon particles, aluminum oxide, and zeolites.

[0066] Inorganic antibacterial and / or antiviral agents may be particulate. The average particle size of the inorganic antibacterial and / or antiviral agent, or the carrier on which it is supported, is, for example, 1 μm. The above average particle size may be 5 nm or more. The average particle size is the primary particle size and is the 50% mean particle size (D50) in the volume-based particle size distribution obtained by laser diffraction-scattering.

[0067] Examples of organic antibacterial and / or antiviral agents include compounds of the phenolic, pyridine, triazine, nitrile, thiazole, alcoholic, aldehyde, disulfide, carboxylic acid, ester, ether, and quaternary ammonium salt types. Specific examples include isopropylmethylphenol, thymol, hexachlorophene, parachlormethacresol, potassium oleate, sodium 1-pentasulfonate, sodium 1-decanesulfonate, sodium butylnaphthalenesulfonate, sodium dodecyl sulfate, sodium dodecylbenzenesulfonate, sodium hexadecyl sulfate, benzalkonium cetyl phosphate, benzethonium chloride, benzalkonium chloride, cetylpyridinium chloride, chlorhexidine hydrochloride, chlorhexidine gluconate, triclocarban, triclosan, halocarban, and parahydroxybenzoic acid esters.

[0068] The amount of the active ingredient of the antibacterial agent and / or antiviral agent is, for example, 0.001 parts by mass or more, may be 0.05 parts by mass or more, or may be 0.1 parts by mass or more, per 100 parts by mass of solid content of the primer. The amount of the active ingredient of the antibacterial agent and / or antiviral agent is, for example, 10 parts by mass or less, may be 5 parts by mass or less, or may be 1 part by mass or less, per 100 parts by mass of solid content of the primer. In one embodiment, the amount of the active ingredient of the antibacterial agent and / or antiviral agent is 0.001 parts by mass or more and 10 parts by mass or less, per 100 parts by mass of solid content of the primer.

[0069] (Method of granting) The method of applying the primer is not particularly limited. Examples of application methods include immersion and coating. Examples of coating methods include coating and spraying. A spraying method may be applicable to various organic substrates.

[0070] (2) Process of applying water-repellent and stain-repellent agents A water-repellent and stain-resistant agent is applied to the surface of the organic substrate. At this point, the previously applied primer remains near the surface of the organic substrate. The water-repellent and antifouling agent is applied so as to cover this primer. This facilitates the reaction between the polyisocyanate compound and the polysiloxane compound contained in the primer. The amount of water-repellent and antifouling agent applied is not particularly limited.

[0071] (Water-repellent and stain-resistant agent) The water-repellent and stain-resistant agent imparts water-repellent and stain-resistant properties to the organic substrate. The water-repellent and stain-resistant agent contains a polysiloxane compound.

[0072] Polysiloxane compounds Polysiloxane compounds have siloxane bonds (-O-Si-) as their main chain and organic groups as all or part of their side chains. The polysiloxane compounds used in this disclosure have a reactive group at one end that can react with an isocyanate group and a hydrophobic group at the other end that is inactive with an isocyanate group. Having a reactive group at only one end makes it easy to position the hydrophobic group toward the outside of the organic substrate, thereby improving water repellency and stain resistance. Furthermore, since the other end of the polysiloxane compound is fixed to the organic substrate in a free state, it is less likely to fall off even when subjected to external loads.

[0073] Examples of side chains of polysiloxane compounds include hydrocarbon groups having 1 to 10 carbon atoms. The hydrocarbon group may be selected from the group consisting of aromatic rings, non-aromatic rings, and aliphatic hydrocarbon groups. The aliphatic hydrocarbon group may be saturated or unsaturated.

[0074] It is desirable that the side chains do not contain hydrolyzable silyl groups. This is because condensation polymerization between polysiloxane compounds is suppressed. When polymerization between polysiloxane compounds is suppressed, the degree of freedom of the polysiloxane compound on the organic substrate is more easily maintained, and thus durability is easily improved. From a similar viewpoint, it is desirable that the side chains do not contain polymerizable groups. Examples of polymerizable groups include epoxy groups, glycidyl groups, alkenyl groups, alkynyl groups, methacrylic groups, acrylic groups, isocyanate groups, and allyl groups. It is desirable that the side chains do not contain reactive groups that can react with isocyanate groups, which will be discussed later. As a result, the polysiloxane compound is fixed to the organic substrate at only one end, and thus durability is easily improved.

[0075] The side chain may be an alkyl group having 1 to 3 carbon atoms or a phenyl group. The side chain may be an alkyl group having 1 to 3 carbon atoms, or a methyl group. The side chain may be substituted or unsubstituted. Examples of substituents include alkyl groups, acyl groups, nitro groups, and sulfonyl groups. It is also desirable that the substituents do not contain hydrolyzable silyl groups, polymerizable groups, or reactive groups.

[0076] Examples of reactive groups include at least one of a hydroxyl group and an amino group.

[0077] The polysiloxane compound may have two or more reactive groups at one end. This increases the number of reaction sites with the polyisocyanate compound, thereby improving durability.

[0078] The reactive group equivalent may be, for example, 1,000 g / mol or more, or 2,000 g / mol or more. The reactive group equivalent may be, for example, 20,000 g / mol or less, or 18,000 g / mol or less. In one embodiment, the reactive group equivalent may be 1,000 g / mol or more and 20,000 g / mol or less.

[0079] The hydrophobic group is not particularly limited as long as it is hydrophobic and nonreactive to the isocyanate group. Examples of hydrophobic groups include hydrocarbon groups having 1 to 10 carbon atoms. The hydrocarbon group may have one selected from the group consisting of aromatic rings, non-aromatic rings, and aliphatic hydrocarbon groups. The hydrophobic group may be an aliphatic hydrocarbon group having 1 to 3 carbon atoms. The aliphatic hydrocarbon group may be saturated or unsaturated. The hydrophobic group may be a methyl group.

[0080] Polysiloxane compounds include, for example, the following formula: [ka] (In the formula, R 1 Each of these is independently a hydrocarbon group having 1 to 10 carbon atoms, and R 2 (where is a hydrophobic group that is inactive with respect to the isocyanate group, X is a monovalent organic group containing a reactive group that can react with the isocyanate group, and n is an integer between 1 and 800.) It is represented as follows.

[0081] X is a monovalent organic group containing a reactive group that can react with an isocyanate group. For example, X is a monovalent organic group having at least one of a hydroxyl group and an amino group. It is preferable that X does not contain a reactive group bonded to a silicon atom. It is preferable that X is not a reactive group directly bonded to a silicon atom.

[0082] Examples of monovalent organic groups having one or more hydroxyl groups include hydroxyalkyl groups with 1 to 20 carbon atoms, -C3H6-O-C2H4OH, -C3H6-O-CH3C(CH2OH)2C2H5, and -C3H6-O-C8H 16 Examples include the OH group. Examples of hydroxyalkyl groups having 1 to 20 carbon atoms include the hydroxymethyl group, hydroxyethyl group, hydroxypropyl group, hydroxybutyl group, hydroxyphenyl group, and hydroxycyclohexyl group.

[0083] Examples of monovalent organic groups having one or more amino groups include C1-C20 aminoalkyl groups and -N(β-aminoethyl)iminopropyl groups. Examples of C1-C20 aminoalkyl groups include aminomethyl groups, aminoethyl groups, aminopropyl groups, aminobutyl groups, aminophenyl groups, and aminocyclohexyl groups.

[0084] R 1 R is an organic group introduced into the side chain, as described above. 1 Each of these may independently be an alkyl group having 1 to 3 carbon atoms or a phenyl group. 1 Each of these may independently be an alkyl group having 1 to 3 carbon atoms, and both may be methyl groups.

[0085] R 2 This is a hydrophobic group that is nonreactive to the isocyanate group, as described above.

[0086] n is an integer between 1 and 800. n can be 10 or greater, and 30 or greater. n can be 400 or less, and 200 or less.

[0087] The solid content concentration in the polysiloxane compound water-repellent and antifouling agent may be 0.01% by mass or more, and may be 0.05% by mass or more. This can further improve the water-repellent and antifouling properties of the coating film. Furthermore, the above reaction proceeds more easily during the fixing process. The solid content concentration in the polysiloxane compound may be 5% by mass or less, and may be 3% by mass or less. In one embodiment, the solid content concentration in the polysiloxane compound water-repellent and antifouling agent is 0.01% by mass or more and 5% by mass or less.

[0088] Organic solvents Water-repellent and stain-repellent agents typically contain organic solvents. The organic solvent adjusts the solid content concentration of the polysiloxane compound to the range specified above. Examples of organic solvents include those similar to those found in primers.

[0089] <<Antibacterial and antiviral agents>> The water-repellent and stain-resistant agent may contain at least one of an antibacterial agent and an antiviral agent. This can impart antibacterial and / or antiviral properties to the painted article. Examples of antibacterial and antiviral agents are as described above.

[0090] The amount of the active ingredient of the antibacterial agent and / or antiviral agent is, for example, 0.1 parts by mass or more, and may be 1.0 part by mass or more, per 100 parts by mass of the solid content of the water-repellent and stain-resistant agent. The amount of the active ingredient of the antibacterial agent and / or antiviral agent is, for example, 50 parts by mass or less, and may be 10 parts by mass or less, per 100 parts by mass of the solid content of the water-repellent and stain-resistant agent. In one embodiment, the amount of the active ingredient of the antibacterial agent and / or antiviral agent is 0.1 parts by mass or more and 50 parts by mass or less, per 100 parts by mass of the solid content of the water-repellent and stain-resistant agent.

[0091] At least one of the primer and the water-repellent / fouling-resistant agent may contain at least one of an antibacterial agent and an antiviral agent. From the viewpoint of durability, the primer may contain at least one of an antibacterial agent and an antiviral agent.

[0092] (others) The water-repellent and stain-resistant agent may contain various other additives as needed. Examples of additives include surface modifiers, leveling agents, plasticizers, defoamers, UV absorbers, antioxidants, and viscosity regulators. Additives may be used individually or in combination of two or more.

[0093] (3) Fixing process After applying the water-repellent and antifouling agent, the isocyanate groups of the polyisocyanate compound react with the hydroxyl groups of the hydroxyl group-containing resin and the reactive groups of the polysiloxane compound. This fixes the primer and water-repellent and antifouling agent to the surface of the organic substrate.

[0094] The above reaction can proceed by heat. Heating can be carried out, for example, by heating using a heating furnace, hot air dryer, or IR heater, or by irradiation with infrared rays using an infrared heat irradiation device. The heating conditions are not particularly limited and can be set appropriately according to the reactivity of the reactive group, the amount of each component added, etc. The heating temperature may be, for example, 70°C to 150°C. The infrared irradiation time may be, for example, 3 minutes to 10 minutes.

[0095] A drying step may be performed before the fixing step. The drying step removes volatile components such as organic solvents. The drying conditions are not particularly limited and can be set appropriately depending on the amount of organic solvent, etc.

[0096] Finally, by removing unreacted components from the coating, a water-repellent and stain-resistant coated article is obtained. Unreacted components can be removed, for example, by wiping with the organic solvent mentioned above.

[0097] The thickness of the coating film formed by the primer and water-repellent / antifouling agent is not particularly limited. Even with a thin coating film, the coated article according to this disclosure exhibits excellent water repellency and antifouling properties, and the durability of these properties is excellent. The thickness of the coating film may be, for example, 1 μm or less, or 100 nm or less. The thickness of the coating film may be, for example, 10 nm or more, or 5 nm or more. In one embodiment, the thickness of the coating film is 5 nm or more and 1 μm or less.

[0098] The use of painted articles is not particularly limited and may be for outdoor or indoor use. Examples of uses for painted articles include automobile bodies, housing equipment, and buildings. Painted articles may constitute at least a part of components that make up at least a part of these. Examples of components for automobile bodies include at least one selected from the group consisting of spoilers, bumpers, mirror covers, grilles, and door handles. Specific examples of components for housing equipment and buildings are as described above. [Examples]

[0099] The present invention will be further described by the following examples, but the present invention is not limited thereto. In the examples, unless otherwise specified, "parts" and "%" refer to the amount of solids by mass.

[0100] The components used in the examples and comparative examples are as follows: Hydroxyl group-containing resin A: Hydroxyl group-containing polyester resin, manufactured by Covestro, Inc., Desmophene XP2488, hydroxyl value 530 mg KOH / g Hydroxyl group-containing resin B: Hydroxyl group-containing polyester resin, manufactured by BASF Corporation, Basonol HPE1170B, hydroxyl value 280 mg KOH / g Hydroxyl group-containing resin C: Hydroxyl group-containing polycarbonate resin, manufactured by Asahi Kasei Corporation, Duranol T5650E, hydroxyl value 225 mg KOH / g

[0101] Polyisocyanate compound A: Takenate D-131N, manufactured by Mitsui Chemicals, Inc., a nurate of m-xylylene diisocyanate. Polyisocyanate compound B: Desmodule N3600, manufactured by Sumika Covestro Co., Ltd., trimmer of hexamethylene diisocyanate.

[0102] Polysiloxane compound A: Manufactured by Shin-Etsu Chemical Co., Ltd., X-22-176GX-A, reactive group equivalent weight 14,000 g / mol, has a dimethylsiloxane skeleton, with one end being -C3H6-O-CH3C(CH2OH)2C2H5 and the other end being a methyl group. Polysiloxane compound B: Manufactured by Shin-Etsu Chemical Co., Ltd., X-22-176F, reactive group equivalent weight approximately 12,400 g / mol, has a dimethylsiloxane skeleton, with one end being -C3H6-O-CH3C(CH2OH)2C2H5 and the other end being a methyl group. Polysiloxane compound C: Manufactured by Shin-Etsu Chemical Co., Ltd., X-22-170DX, reactive group equivalent weight approximately 4,670 g / mol, has a dimethylsiloxane skeleton, with one end being -C3H6-O-C2H4OH and the other end being a methyl group. Polysiloxane compound a: Manufactured by Shin-Etsu Chemical Co., Ltd., KF-6003, reactive group equivalent weight approximately 2,500 g / mol, has a dimethylsiloxane skeleton, and both ends are -C3H6-O-C2H4OH.

[0103] [Example 1] (a) Preparation of primers The main component was obtained by stirring and mixing 4 parts of hydroxyl group-containing resin A, 0.012 parts of dibutyltin dilaurate (curing catalyst), and cyclohexanone (organic solvent) at room temperature to a total of 100 parts. A curing agent was obtained by stirring and mixing 4 parts of polyisocyanate compound A and 96 parts of cyclohexanone (organic solvent) at room temperature. A primer was prepared by mixing 100g of the main component with 250g of the hardener. The equivalent ratio (NCO / OH) was set to 1.2.

[0104] (b) Preparation of water-repellent and stain-repellent agents A water-repellent and antifouling agent was prepared by stirring and mixing 1 part of a polysiloxane compound A with one end reactive and 99 parts of heptane at room temperature.

[0105] (c) Preparation of organic substrate The surface of the glass fiber-reinforced unsaturated polyester resin was degreased with isopropyl alcohol to prepare the organic substrate.

[0106] (d) Primer application A primer was applied to the organic substrate using a cloth. The primer was applied in a way that no application marks were visible to the naked eye.

[0107] (e) Application of water-repellent and stain-resistant agents Next, a water-repellent and stain-resistant agent was applied to the organic substrate coated with primer using a cloth.

[0108] (f) Heating Next, the organic substrate coated with primer and water-repellent / anti-fouling agent was heated in an 80°C oven for 20 minutes. Finally, the surface of the coating was wiped with isopropyl alcohol to obtain the coated article. The thickness of the coating was 15 nm.

[0109] [Example 2] A primer and a water-repellent and antifouling agent were prepared in the same manner as in Example 1, except that polyisocyanate compound B was used instead of polyisocyanate compound A. These were then sequentially applied to an organic substrate to obtain a coated article.

[0110] [Example 3] A primer and a water-repellent and antifouling agent were prepared in the same manner as in Example 1, except that polysiloxane compound B, which is reactive at one end, was used instead of polysiloxane compound A. These were then sequentially applied to an organic substrate to obtain a coated article.

[0111] [Example 4] A primer and a water-repellent and antifouling agent were prepared in the same manner as in Example 1, except that polysiloxane compound C, which is reactive at one end, was used instead of polysiloxane compound A. These were then sequentially applied to an organic substrate to obtain a coated article.

[0112] [Example 5] A primer and a water-repellent and antifouling agent were prepared in the same manner as in Example 1, except that hydroxyl group-containing resin B was used instead of hydroxyl group-containing resin A. These were then sequentially applied to an organic substrate to obtain a coated article.

[0113] [Example 6] A primer and a water-repellent and antifouling agent were prepared in the same manner as in Example 1, except that hydroxyl group-containing resin C was used instead of hydroxyl group-containing resin A. These were then sequentially applied to an organic substrate to obtain a coated article.

[0114] [Example 7] A primer and a water-repellent and antifouling agent were prepared in the same manner as in Example 1, except that 10 parts of antibacterial agent A (NanoPure AGS-MB-3000, a methyl ethyl ketone dispersion of silver (0.3% by mass of active ingredient), manufactured by Nippon Ion Co., Ltd.) were added to the primer. These were then sequentially applied to an organic substrate to obtain a coated article.

[0115] [Comparative Example 1] A painted article was obtained by sequentially applying a primer and a water-repellent and antifouling agent to an organic substrate in the same manner as in Example 1, except that polysiloxane compound a, which is reactive at both ends, was used instead of polysiloxane compound A.

[0116] [Comparative Example 2] A painted article was obtained by sequentially applying a primer and a water-repellent and antifouling agent to an organic substrate in the same manner as in Example 1, except that fluorine compound b (manufactured by Tokyo Chemical Industry Co., Ltd., 2,2,3,3,4,4,5,5-octafluoro-1-pentanol) was used instead of polysiloxane compound A.

[0117] [Comparative Example 3] Only the water-repellent and stain-resistant agent prepared in Example 1 was applied to an organic substrate, and a painted article was obtained in the same manner as in Example 1.

[0118] [Comparative Example 4] Only the primer prepared in Example 1 was applied to an organic substrate, and a coated article was obtained in the same manner as in Example 1.

[0119] [evaluation] The water repellency, stain resistance, and durability of the coated articles obtained in the examples and comparative examples were evaluated. Evaluations were performed on the coated articles initially, after alkali resistance testing, after water resistance testing, and after abrasion resistance testing. Higher evaluations after alkali resistance testing, water resistance testing, and abrasion resistance testing indicate superior durability. The methods for each test are described below. The evaluation results are shown in Table 1.

[0120] (1) Alkali resistance test The painted article was immersed in a fungicide (registered trademark, manufactured by Johnson & Johnson Co., Ltd., alkaline) at 40 °C for 24 hours. Thereafter, the painted article was washed with ion-exchanged water and dried.

[0121] (2) Water resistance test The painted article was immersed in ion-exchanged water for 240 hours. Thereafter, the painted article was dried.

[0122] (3) Abrasion resistance test In water at 20 to 25 °C, 3M Scotch-Brite (商標) antibacterial urethane sponge S-21KS was applied to the surface of the painted article, and 20 reciprocations were made while applying a load of 500 gf. Thereafter, the painted article was dried.

[0123] (i) Water repellency: Contact angle of water In accordance with JIS R 3257 "Test method for wettability of substrate glass surface" (static drop method), the contact angle of water droplets on the surface of the initial product and each painted article tested by the above method was measured. Specifically, using DMo-701 manufactured by Kyowa Interface Science Co., Ltd., 4 μL of distilled water was dropped onto the coating film, and the contact angle after 60 seconds was measured.

[0124] (ii) Antifouling property: Cleaning performance against mineral components 150 μL of water was dropped onto the painted surface of the object to be painted, and it was dried at 40 °C for 24 hours to create a white water droplet stain. Thereafter, in water at 20 to 25 °C, 3M Scotch-Brite (商標) antibacterial urethane sponge S-21KS was applied to the surface of the painted article, and 20 reciprocations were made while applying a load of 500 gf. Thereafter, the remaining water droplet stain was visually observed and evaluated according to the following criteria. Painted articles with an evaluation of "best" and "good" have antifouling properties, and painted articles with an evaluation of "poor" do not have antifouling properties. Best: No water droplet stain is visually recognized Good: The water droplet stain is slightly visually recognized Poor: The water droplet stain is clearly visually recognized

[0125]

Table 1

[0126] [Table 2]

[0127] All of the coated articles in the examples showed good water repellency and stain resistance initially. Furthermore, even after each test, the contact angle was greater than 95°, indicating excellent water repellency and maintaining stain resistance. On the other hand, the coated articles of Comparative Examples 1 and 2 showed good initial water repellency and stain resistance, but lacked durability. The coated articles of Comparative Examples 3 and 4 also lacked initial water repellency and stain resistance.

[0128] Furthermore, when a test was conducted using the coated article of Example 7 containing an antibacterial agent, in accordance with JIS Z 2801 "Antibacterial processed products - Antibacterial test method and antibacterial effect", it showed an antibacterial activity value of 3.6 against Escherichia coli NBRC3972.

[0129] The present invention includes the following embodiments. [1] A step of applying a primer to the surface of an organic substrate, A step of applying a water-repellent and stain-resistant agent to the surface of the organic substrate to which the primer has been applied, The process includes fixing the primer and the water-repellent and stain-resistant agent to the surface of the organic substrate, The primer comprises a hydroxyl group-containing resin and a polyisocyanate compound. The water-repellent and stain-repellent agent comprises a polysiloxane compound having a reactive group at one end that can react with an isocyanate group and a hydrophobic group at the other end that is inactive with an isocyanate group. A method for producing a coated article, wherein in the fixing step, the isocyanate group of the polyisocyanate compound reacts with the hydroxyl group of the hydroxyl group-containing resin and the reactive group of the polysiloxane compound. [2] The surface treatment agent according to [1] above, wherein the equivalent ratio (NCO / OH) of the isocyanate group of the polyisocyanate compound to the hydroxyl group of the hydroxyl group-containing resin is greater than 1.0. [3] The surface treatment agent according to [1] or [2] above, wherein the reactive group is at least one of a hydroxyl group and an amino group. [4] The polysiloxane compound is a surface treatment agent of any of the above [1] to [3], having two or more of the reactive groups at one of its terminal ends. [5] The polyisocyanate compound is a surface treatment agent of any of the above [1] to [4] having an aromatic hydrocarbon group. [6] The hydroxyl group-containing resin is any of the surface treatment agents [1] to [5] above, having a hydroxyl value of 220 mg KOH / g or more and 600 mg KOH / g or less. [7] A method for manufacturing a painted article according to any of the above [1] to [6], wherein at least one of the primer and the water-repellent and antifouling agent further comprises at least one of an antibacterial agent and an antiviral agent. [8] The hydroxyl group-containing resin is a hydroxyl group-containing polyester resin, and the method for manufacturing a coated article according to any of the above [1] to [7]. [9] The method for manufacturing a coated article according to any of the above [1] to [8], wherein the organic substrate includes fiber-reinforced plastic.

[10] The aforementioned organic substrate is an organic substrate that forms at least a part of at least one of a component used in housing equipment and a component used in a building. The aforementioned residential equipment is at least one selected from the group consisting of a bathtub, bathroom walls, bathroom counter, and vanity unit. A method for manufacturing any of the above-mentioned painted articles [1] to [9], wherein the building is at least one of siding material and carport. [Industrial applicability]

[0130] The painted articles of this disclosure exhibit excellent water repellency and stain resistance, and have excellent durability in these properties, making them suitable for various applications where water repellency and stain resistance are required.

Claims

1. A step of applying a primer to the surface of an organic substrate, A step of applying a water-repellent and stain-resistant agent to the surface of the organic substrate to which the primer has been applied, The process includes fixing the primer and the water-repellent and stain-resistant agent to the surface of the organic substrate, The primer comprises a hydroxyl group-containing resin and a polyisocyanate compound. The water-repellent and stain-repellent agent comprises a polysiloxane compound having a reactive group at one end that can react with an isocyanate group and a hydrophobic group at the other end that is inactive with an isocyanate group. A method for producing a coated article, wherein in the fixing step, the isocyanate group of the polyisocyanate compound reacts with the hydroxyl group of the hydroxyl group-containing resin and the reactive group of the polysiloxane compound.

2. The method for producing a coated article according to claim 1, wherein the equivalent ratio of isocyanate groups in the polyisocyanate compound to hydroxyl groups in the hydroxyl group-containing resin, NCO / OH, is greater than 1.

0.

3. The method for producing a coated article according to claim 1, wherein the reactive group is at least one of a hydroxyl group and an amino group.

4. The method for producing a coated article according to claim 1, wherein the polysiloxane compound has two or more of the reactive groups at one of its terminal ends.

5. The method for producing a coated article according to claim 1, wherein the polyisocyanate compound has an aromatic hydrocarbon group.

6. The method for producing a coated article according to claim 1, wherein the hydroxyl group-containing resin has a hydroxyl value of 220 mg KOH / g or more and 600 mg KOH / g or less.

7. The method for manufacturing a painted article according to claim 1, wherein at least one of the primer and the water-repellent and stain-resistant agent further comprises at least one of an antibacterial agent and an antiviral agent.

8. The method for manufacturing a coated article according to claim 1, wherein the hydroxyl group-containing resin includes a hydroxyl group-containing polyester resin.

9. The method for manufacturing a painted article according to claim 1, wherein the organic substrate includes fiber-reinforced plastic.

10. The aforementioned organic substrate is an organic substrate that forms at least a part of at least one of a component used in housing equipment and a component used in a building. The components used in the aforementioned residential equipment are at least one selected from the group consisting of a bathtub, bathroom walls, bathroom counter, and vanity unit. The method for manufacturing a painted article according to claim 1, wherein the member used in the building is at least one of siding material and a carport.

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