Water-based coating composition, coating film and coated substrate

Abstract

To provide an aqueous coating composition which is excellent in dryness while enabling formation of a coating film excellent in scratch resistance, antibacterial property and antiviral property.SOLUTION: An aqueous coating composition contains an anionic or nonionic resin (a), an anionic or nonionic antiviral agent (b), and a synthetic wax (c), wherein the resin (a) contains a resin (a1) having a glass transition temperature of 0°C or lower, and a resin (a2) having a glass transition temperature of 50°C or higher.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a water-based paint composition, a coating, and a coated substrate. [Background technology]

[0002] Generally, various substrates are provided with a coating (protective layer, paint film) for the purpose of protecting the substrate from dirt, scratches, and the like. Among these substrates, coatings provided on substrates that come into contact with people are particularly required to have antibacterial and antiviral properties in addition to protecting the substrate from scratches and the like. For example, Patent Document 1 discloses an antiviral composition. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-178076 Summary of the Invention [Problem to be solved by the invention]

[0004] As a coating composition for forming such a coating, there is a demand for a water-based coating composition with a reduced content of volatile organic compounds (VOCs), from the viewpoints of environmental conservation such as preventing sick house syndrome and ensuring a safe working environment, as well as safety, such as being a non-hazardous material and therefore easy to store and free from the risk of ignition. In particular, paint compositions for on-site painting in residential spaces and the like are required to have the above safety standards, and therefore there is an increasing demand for the use of water-based paint compositions.

[0005] On the other hand, since aqueous coating compositions contain water, the water, which has a high specific heat, must be evaporated to form a coating. If an aqueous coating composition is applied in a residential or other similar environment and it takes a long time for the composition to dry, it will take a long time before people can walk on the surface or install furniture, resulting in disruption to daily life.

[0006] When a water-based paint composition is applied on an industrial painting line or the like, the drying process can be accelerated by hot air drying or the like. However, when the composition is applied on-site in a residential space or the like, hot air drying or the like is often not possible, and the coating is usually formed by natural drying at room temperature. Therefore, water-based paint compositions for on-site application in particular are required to have excellent drying properties.

[0007] The present invention has been made in view of the above, and an object of the present invention is to provide an aqueous coating composition that is capable of forming a coating film that is excellent in scratch resistance, antibacterial properties, and antiviral properties, and that also has excellent drying properties. [Means for solving the problem]

[0008] The present inventors have conducted extensive research to solve the above-mentioned problems. As a result, they have found that the above-mentioned problems can be solved by the following configuration examples, and have completed the present invention. The configuration examples of the present invention are as follows.

[0009] [1] An anionic or nonionic resin (a), an anionic or nonionic antiviral agent (b); Synthetic wax (c) and Contains The resin (a) includes a resin (a1) having a glass transition temperature of 0°C or lower and a resin (a2) having a glass transition temperature of 50°C or higher. Water-based paint composition.

[0010] [2] The water-based coating composition according to [1], wherein the resin (a) comprises an acrylic resin. [3] The water-based coating composition according to [1] or [2], wherein the content of the resin (a1) is 20 to 80 mass % relative to 100 mass % of the total of the resins (a1) and (a2).

[0011] [4] The aqueous coating composition according to any one of [1] to [3], wherein the antiviral agent (b) is an inorganic antiviral agent.

[0012] [5] The aqueous coating composition according to any one of [1] to [4], wherein the synthetic wax (c) comprises at least one selected from paraffin wax, polyethylene wax, and oxides thereof.

[0013] [6] The aqueous coating composition according to any one of [1] to [5], further comprising an anti-discoloration agent (d).

[0014] [7] The water-based coating composition according to any one of [1] to [6], which is for use on a wood substrate.

[0015] [8] A coating formed from the water-based coating composition according to any one of [1] to [7]. [9] A coated substrate comprising a substrate and the coating according to [8]. [Effects of the Invention]

[0016] The aqueous coating composition according to the present invention has excellent drying properties, and can form a coating that has a good balance of excellent scratch resistance, antibacterial properties (particularly antibacterial properties against Escherichia coli and Staphylococcus aureus), and antiviral properties (particularly antiviral properties against enveloped viruses such as influenza virus and non-enveloped viruses such as feline calicivirus (a norovirus substitute)). The water-based coating composition according to the present invention can exert the above effects throughout the year. As described above, the aqueous coating composition of the present invention is capable of forming a coating film that has excellent scratch resistance, antibacterial properties, and antiviral properties all year round, and therefore can be suitably used for substrates (substrates) that require these effects.

[0017] The bacteria to be antibacterial are not particularly limited, and include various bacteria regardless of their nature, such as gram-positive, gram-negative, aerobic, anaerobic, etc. Examples of such bacteria include Escherichia coli, Staphylococcus aureus, Staphylococcus epidermidis, streptococci, Streptococcus pneumoniae, Haemophilus influenzae, Bordetella pertussis, Salmonella enteritidis, Klebsiella pneumoniae, Pseudomonas aeruginosa, Vibrio, Salmonella enterica, Shigella, Bacillus anthrax, Mycobacterium tuberculosis, Clostridium botulinum, Clostridium tetani, and streptococci.

[0018] The viruses that are the targets of the antiviral activity are not particularly limited, and include various viruses regardless of the type of genome, the presence or absence of an envelope, and the like. Examples of the enveloped virus include influenza viruses such as avian influenza virus, human influenza virus, and swine influenza virus, hepatitis B virus or C virus, human immunodeficiency virus, varicella-zoster virus, herpes simplex virus, human herpes virus, mumps virus, respiratory syncytial virus, and Ebola virus. Examples of the non-enveloped viruses include norovirus, rotavirus, adenovirus, hepatitis A virus, poliovirus, and coxsackievirus. DETAILED DESCRIPTION OF THE INVENTION

[0019] ≪Water-based paint composition≫ The aqueous coating composition according to the present invention (hereinafter also referred to as "the composition") contains an anionic or nonionic resin (a) [hereinafter also referred to as "component (a)"; the same applies to other components], an anionic or nonionic antiviral agent (b), and a synthetic wax (c), The resin (a) includes a resin (a1) having a glass transition temperature of 0°C or lower and a resin (a2) having a glass transition temperature of 50°C or higher.

[0020] As components (a) and (b), it is preferable to use liquid components (aqueous solutions or aqueous dispersions) as raw materials for the present composition, as described below. When using such liquid components, the present inventors have conducted extensive research and found that if cationic components are used as components (a) and (b), the resulting composition becomes gel-like or precipitates, making it difficult to use as a paint. Therefore, one of the features of the present composition is that anionic or nonionic components are used as components (a) and (b). In the present composition, when a liquid component is used as component (c) or other components described below, it is preferable that the component is also an anionic or nonionic component. On the other hand, when a powder is used as component (c), the powder component (c) does not have ionicity, and therefore there are no particular restrictions on the ionicity of the powder component (c).

[0021] The present composition is a water-based paint composition, and the water-based paint composition refers to a composition in which constituent components such as components (a) to (c) are dispersed and / or dissolved in water or a medium containing water as the main component (aqueous medium). The content of water in the present composition is preferably 35 to 95 mass %, more preferably 50 to 80 mass %.

[0022] <Component (a)> The component (a) is required to contain the components (a1) and (a2), but is not particularly limited as long as it is an anionic or nonionic resin, and may be selected appropriately depending on the type of substrate to be coated. The component (a) is preferably a resin that can be used in a water-based coating composition and has film-forming ability. The component (a1) used in the present composition may be one type or two or more types, and the component (a2) used in the present composition may be one type or two or more types.

[0023] Specific examples of component (a) include (meth)acrylic resins, (meth)acrylic silicone resins, urethane resins, fluororesins, epoxy resins, polyester resins, alkyd resins, melamine resins, vinyl acetate resins, silicone resins, and vinyl acetate-Vevo resins. Among these, (meth)acrylic resins, urethane resins, and silicone resins are preferred because they can easily form coatings that are excellent in scratch resistance and stain resistance, and (meth)acrylic resins are particularly preferred from the standpoint of cost.

[0024] The weight average molecular weight (Mw) of component (a) is preferably 5,000 to 300,000, more preferably 30,000 to 100,000, from the viewpoint of being able to easily form a coating film with high strength. The Mw can be measured by gel permeation chromatography (GPC).

[0025] The glass transition temperature (Tg) of component (a1) is preferably −30 to −1° C., more preferably −20 to −1° C., from the viewpoints that a composition with excellent film-forming properties can be easily obtained, that it has excellent adhesion to various substrates, and that it is easy to form a coating that is transparent and less prone to cracking during the film-forming process even in winter.

[0026] The Tg of the resin (a2) is preferably 51 to 90°C, more preferably 60 to 80°C, from the viewpoints that a coating having high hardness and reduced surface tackiness can be easily formed.

[0027] The component (a) may further contain a resin (a3) ​​having a Tg of more than 0°C and less than 50°C.

[0028] In the present invention, Tg can be measured by DSC (differential scanning calorimetry), but can also be approximately calculated using the following Fox formula described in Fox TG, Bull. Am. Physics Soc. 1, 3, p. 123 (1956).

[0029]

number

[0030] Tg n For example, the values ​​described in Polymer Handbook 2nd Edition, J. Wiley & Sons, New York (1975) can be used as reference.

[0031] The minimum film-forming temperature (MFT) of component (a) is preferably -30 to 100°C, more preferably -20 to 90°C, since a long curing time is not required and a coating composition with excellent drying properties can be easily obtained. The MFT in the present invention is a value measured by the temperature gradient plate method of ISO standard 2115 using a thermal gradient type MFT measuring device (manufactured by Imoto Machinery Co., Ltd.).

[0032] Component (a) preferably contains a resin (a1') having a minimum film-forming temperature (MFT) of 5°C or less and a resin (a2') having an MFT of 55°C or more, from the viewpoint of being able to easily form a coating that has excellent adhesion to the substrate and scratch resistance. The component (a) may further contain a resin (a3') having an MFT of more than 5°C and less than 55°C.

[0033] The MFT of resin (a1') is preferably -30 to 4°C, since it is possible to easily obtain a composition with excellent film-forming properties, which has excellent adhesion to various substrates, and which can easily form a transparent coating that is less likely to crack during the film-forming process, even in winter.

[0034] The MFT of the resin (a2') is preferably 56 to 90°C, since it has high hardness and can easily form a coating with reduced surface tackiness.

[0035] It is preferable that the resin (a1) and the resin (a1') are the same resin, that is, the resin (a1) satisfies the MFT conditions of the resin (a1') in addition to the Tg. Furthermore, it is preferable that the resin (a2) and the resin (a2') are the same resin, that is, it is preferable that the resin (a2) satisfies the MFT conditions of the resin (a2') in addition to the Tg.

[0036] The content of resin (a1) relative to 100% by mass of the total of resin (a1) and resin (a2) [content of resin (a1') relative to 100% by mass of the total of resin (a1') and resin (a2')] is preferably 20 to 80% by mass, more preferably 40 to 60% by mass, from the viewpoints that a coating composition with excellent drying properties can be easily obtained and a coating film with a good balance between adhesion to the substrate and scratch resistance can be easily formed.

[0037] The content of resin (a) is preferably 70 to 99 mass%, more preferably 75 to 95 mass%, and particularly preferably 80 to 92 mass%, relative to 100 mass% of the solid content of the composition, from the viewpoints that a coating composition with excellent drying properties can be easily obtained, and a coating with excellent adhesion to the substrate and excellent scratch resistance, flexibility, impact resistance, and hardness can be easily formed.

[0038] In the present invention, the solid content refers to the heating residue obtained in accordance with JIS K 5601-1-2:2008 (heating temperature: 105°C, heating time: 60 minutes). The solid content of the present composition also refers to the components that make up the coating film formed from the present composition.

[0039] As component (a) used as a raw material for the present composition [component (a) used when preparing the present composition], an aqueous dispersion of the resin, particularly an emulsion, is preferred, and a (meth)acrylic resin emulsion is even more preferred, because the present composition, which is an aqueous paint composition, can be easily prepared and a coating having the desired physical properties can be easily formed.

[0040] Examples of the (meth)acrylic resin emulsion include conventionally known emulsions obtained by emulsion polymerization in one or more stages of polymerizable unsaturated monomer components containing one or more (meth)acryloyl compounds as essential components and, if necessary, one or more other polymerizable unsaturated monomers, in the presence of water and a dispersion stabilizer.

[0041] Examples of the (meth)acryloyl compound include linear or branched alkyl (meth)acrylates such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, i-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, and isostearyl (meth)acrylate; cyclohexyl (meth)acrylate, methyl cyclohexyl (meth)acrylate, and the like. Alicyclic alkyl (meth)acrylates such as cyclohexyl (meth)acrylate, t-butylcyclohexyl (meth)acrylate, isobornyl (meth)acrylate, and adamantyl (meth)acrylate; aralkyl (meth)acrylates such as benzyl (meth)acrylate; alkoxyalkyl (meth)acrylates such as 2-methoxyethyl (meth)acrylate and 2-ethoxyethyl (meth)acrylate; hexafluoro-i-propyl (meth)acrylate, perfluorooctylmethyl (meth)acrylate, and perfluorooctylethyl Fluoroalkyl (meth)acrylates such as 2-(meth)acryloyloxyethyl)acid phosphate, (2-(meth)acryloyloxypropyl)acid phosphate, and other phosphate group-containing (meth)acrylates; N,N-dialkylaminoalkyl (meth)acrylates such as N,N-diethylaminoethyl (meth)acrylate; (meth)acrylamide; (meth)acrylic acid, β-carboxyethyl (meth)acrylate, and other carboxyl group-containing (meth)acryloyl monomers; acetoacetoxyethyl Carbonyl group-containing (meth)acryloyl monomers such as (meth)acrylate and diacetone (meth)acrylamide; epoxy group-containing (meth)acryloyl monomers such as glycidyl (meth)acrylate, β-methylglycidyl (meth)acrylate, 3,4-epoxycyclohexylmethyl (meth)acrylate, 3,4-epoxycyclohexylethyl (meth)acrylate, and 3,4-epoxycyclohexylpropyl (meth)acrylate; isocyanato group-containing (meth)acryloyl monomers such as isocyanatoethyl (meth)acrylate;Alkoxysilyl group-containing (meth)acryloyl monomers such as γ-(meth)acryloyloxypropyltrimethoxysilane and γ-(meth)acryloyloxypropyltriethoxysilane; oxidatively curable group-containing (meth)acryloyl monomers such as dicyclopentenyloxyethyl (meth)acrylate, dicyclopentenyloxypropyl (meth)acrylate, and dicyclopentenyl (meth)acrylate; heterocyclic group-containing (meth)acryloyl monomers such as 1,2,2,6,6-pentamethylpiperidyl (meth)acrylate and 2,2,6,6-tetramethylpiperidinyl (meth)acrylate; 2-((meth)acryloyloxy)ethyltriethoxysilane; Examples of the quaternary ammonium base-containing (meth)acrylates include methylammonium chloride, 2-((meth)acryloyloxy)ethyltrimethylammonium bromide, (meth)acryloylaminopropyltrimethylammonium chloride, (meth)acryloylaminopropyltrimethylammonium bromide, tetrabutylammonium (meth)acrylate, tetramethylammonium (meth)acrylate, trimethylbenzylammonium (meth)acrylate, and 2-((meth)acryloyloxy)ethyltrimethylammonium dimethyl phosphate; and (meth)acrylates having a polyoxyalkylene chain.

[0042] In the present invention, "(meth)acrylic" is a concept that encompasses acrylic, methacrylic, or both acrylic and methacrylic, "(meth)acryloyl" is a concept that encompasses acryloyl, methacryloyl, or both acryloyl and methacryloyl, and "(meth)acrylate" is a concept that encompasses acrylate, methacrylate, or both acrylate and methacrylate.

[0043] Examples of the other polymerizable unsaturated monomers include cyano group-containing compounds such as acrylonitrile and methacrylonitrile; vinyl ester compounds such as vinyl acetate and vinyl propionate; vinyl aromatic compounds such as styrene and α-methylstyrene; carboxyl group-containing polymerizable unsaturated monomers such as maleic acid, itaconic acid, and crotonic acid; carbonyl group-containing polymerizable unsaturated monomers such as acrolein, methacrolein, formylstyrene, vinyl alkyl ketones having 4 to 7 carbon atoms (for example, vinyl methyl ketone, vinyl ethyl ketone, and vinyl butyl ketone), and acetoacetoxy allyl esters; Examples of the polymerizable unsaturated monomers include epoxy group-containing polymerizable unsaturated monomers such as diglycidyl ether; isocyanato group-containing polymerizable unsaturated monomers such as mi-propenyl-α,α-dimethylbenzyl isocyanate; alkoxysilyl group-containing polymerizable unsaturated monomers such as vinyltrimethoxysilane and vinyltriethoxysilane; oxidatively curable group-containing polymerizable unsaturated monomers such as reaction products of epoxy group-containing polymerizable unsaturated monomers or hydroxyl group-containing polymerizable unsaturated monomers with unsaturated fatty acids; and fluorovinyl ethers such as fluoroalkyltrifluorovinyl ether and perfluoroalkyltrifluorovinyl ether.

[0044] When the (meth)acrylic resin is a copolymer of a (meth)acryloyl compound and another polymerizable unsaturated monomer, the content of structural units derived from the (meth)acryloyl compound relative to 100% by mass of all structural units in the (meth)acrylic resin is preferably 20 to 99.9% by mass, and more preferably 40 to 99.5% by mass.

[0045] From the viewpoint of the stability of the emulsion, the solid content in the emulsion is preferably 30% by mass or more, more preferably 35% by mass or more, and preferably 70% by mass or less, more preferably 60% by mass or less.

[0046] The average particle size of the resin in the emulsion is preferably 0.05 to 0.9 μm, more preferably 0.1 to 0.8 μm, from the viewpoints of excellent emulsion stability and easy production of a composition with excellent film-forming properties. The term "average particle size" in this specification refers to the particle size (median size, d50) corresponding to 50% of the volume-based cumulative particle size distribution measured based on the "Particle size analysis - Laser diffraction and scattering method" specified in JIS Z 8825:2013.

[0047] The viscosity of the emulsion is preferably 40 to 1500 mPa·s, and more preferably 70 to 500 mPa·s, from the viewpoint that a composition with excellent film-forming properties can be easily obtained.

[0048] The aqueous dispersion or emulsion is a dispersion in which a resin is dispersed in a dispersion medium containing water (hereinafter also referred to as an "aqueous medium"). The aqueous medium is not particularly limited as long as it contains water, but the content of water in the aqueous medium is preferably 50 to 100% by mass, more preferably 60 to 100% by mass.

[0049] The aqueous medium may contain a medium other than water, and examples of such a medium include acetone, methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, isobutyl alcohol, 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, 1-methoxy-2-propanol, 1-ethoxy-2-propanol, diacetone alcohol, dioxane, ethylene glycol, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol monopropyl ether, and ethylene glycol monohexyl ether. These may be used alone or in combination.

[0050] The emulsion can be prepared, for example, by emulsifying a resin using a surfactant, or by directly emulsion-polymerizing a monomer that forms the resin. The surfactant is not particularly limited and can be appropriately selected from anionic surfactants and nonionic surfactants, and one or more types may be used.

[0051] The emulsion may be one produced by a conventionally known method, or a commercially available product. For example, commercially available acrylic resin emulsions include the "Boncoat Series" [e.g., AC-501, S-5, SS-5, AC-501, H-5, AB-901, W-26, W-386] (manufactured by DIC Corporation); the "Acryset Series" [e.g., EF-002, EF-005, EF-006, EF-007, EF-008, EF-009, EMN-325E, 210E, 110E, 202E, 250E] (manufactured by Nippon Shokubai Co., Ltd.); "Polysol series" [e.g., AT860, AT115, AM610, AM961, AP1761, AP4690N] (manufactured by Showa Denko K.K.); "Iodosol series" [e.g., AD57, AD93, AD112, AD153, AD161, AD173, AD176, AD179, AD190, AD504, AF-8] (manufactured by Henkel Technologies Japan) "Polydurex Series" [e.g., H7650, H-7000, G613, G633, G621] (manufactured by Asahi Kasei Corporation); "Primal Series" [e.g., AC2235, B-15, AC507, AC3444, RP-29] (manufactured by Rohm and Haas Japan Co., Ltd.); "Acronal Series" [e.g., 296D, 4110, 4220, 4130, 4415, 4 670, YJ-2730, YJ-2733] (manufactured by BASF Japan Ltd.); "Movinyl series" [e.g., 743N, 6520, DM774, ES-85, ES-90, 4060, 4061, 760H, 761HG, 987B, FK-900] (manufactured by Japan Coating Resin Co., Ltd.); "Zemlac series" [e.g., W3108F, W3153CF] (manufactured by Kaneka Corporation).

[0052] <Ingredient (b)> The component (b) is not particularly limited as long as it is an anionic or nonionic antiviral agent, and any known antiviral agent can be used. Although component (b) is defined as an antiviral agent for convenience, it may also be an anionic or nonionic antibacterial agent. The component (b) used in the present composition may be one type or two or more types.

[0053] Component (b) may be an organic antiviral agent, but is preferably an inorganic antiviral agent, since it can easily form a coating that has superior antiviral properties against enveloped viruses such as influenza virus and non-enveloped viruses such as feline calicivirus.

[0054] The inorganic antiviral agent is not particularly limited, and examples thereof include conventionally known antiviral agents. A suitable example of the inorganic antiviral agent is a double salt of molybdenum oxide with one or more oxides selected from silver, zinc, and copper (molybdenum oxide metal double salt). Here, examples of the oxide of one or more selected from silver, zinc, and copper include silver oxide, zinc oxide, copper(I) oxide, and copper(II) oxide.

[0055] The molybdenum oxide metal double salt may be a double salt obtained by reacting one or more salts selected from silver, zinc, and copper with a molybdenum oxo-compound salt, specifically, a double salt obtained by mixing an aqueous solution of one or more salts selected from silver, zinc, and copper with an aqueous solution of a molybdenum oxo-compound salt, and then reacting them. In this case, examples of the silver salt include silver nitrate, silver acetate, and silver sulfate; examples of the zinc salt include zinc nitrate, zinc acetate, and zinc sulfate; and examples of the copper salt include copper nitrate, copper acetate, and copper sulfate. Examples of molybdenum oxo compound salts include sodium molybdate, potassium molybdate, lithium molybdate, ammonium molybdate, sodium polymolybdate, and sodium isopolymolybdate.

[0056] The inorganic antiviral agent may be an antiviral agent other than the molybdenum oxide metal double salt, and examples of such antiviral agents include photocatalysts, materials in which metal ions are supported on an ion exchanger, and antibacterial ceramics. Specific examples of these include the agents described in WO 2016 / 084774.

[0057] The organic antiviral agent is not particularly limited, and examples thereof include conventionally known antiviral agents. Examples of the organic antiviral agent include quaternary ammonium salts, pyrithione compounds, sulfonic acid group-containing polymers, amino group-containing polyvinyl alcohols, organic nitrogen-bromine compounds, H-type carboxyl group-containing polymers, the antiviral compositions described in JP 2018-193337 A, and other antibacterial components.

[0058] The content of component (b) is preferably 0.1 to 15 mass%, more preferably 1 to 12 mass%, and particularly preferably 2 to 10 mass%, relative to 100 mass% of the solid content of the composition, from the viewpoint of being able to easily form a coating that has a good balance between antibacterial and antiviral properties, adhesion to the substrate, and scratch resistance.

[0059] As component (b) used as a raw material for the present composition [component (b) used when preparing the present composition], an aqueous solution or aqueous dispersion (including emulsion and dispersion) of the antiviral agent is preferred, because the present composition, which is an aqueous paint composition, can be easily prepared and a coating having the desired physical properties can be easily formed. The content of the antiviral agent in the aqueous solution or aqueous dispersion is preferably 5% by mass or more and preferably 80% by mass or less. The aqueous solution or aqueous dispersion is a solution or dispersion in which the antiviral agent is dissolved or dispersed in an aqueous medium. The water content and specific examples of the medium other than water in the aqueous solution or aqueous dispersion are as described in the section for component (a).

[0060] The aqueous solution or aqueous dispersion may be prepared by dissolving or dispersing an anionic or nonionic antiviral agent in an aqueous medium by a known method, or may be a commercially available product, such as those manufactured by Yamato Chemical Industry Co., Ltd., J-Chemical Co., Ltd., Nippon Exlan Kogyo Co., Ltd., Sumika Environmental Science Co., Ltd., Fuji Chemical Co., Ltd., or Nicca Chemical Co., Ltd.

[0061] <Ingredient (c)> The component (c) is not particularly limited, and any conventionally known synthetic wax can be used, but hydrocarbon waxes are preferred. Here, the "wax" in component (c) refers to, for example, a material that is solid or semi-solid at room temperature, is an organic substance having an alkyl group, melts in a temperature range from room temperature to around 150°C, and has a low melt viscosity. The component (c) used in the present composition may be one type or two or more types.

[0062] Examples of component (c) include petroleum waxes such as paraffin wax and microcrystalline wax, and synthetic hydrocarbon waxes such as Fischer-Tropsch wax, polyethylene wax, oxidized polyethylene wax, polypropylene wax, and oxidized polypropylene wax. These waxes generally have 20 or more carbon atoms.

[0063] From the viewpoint of being able to easily form a coating having superior scratch resistance, component (c) preferably contains at least one selected from paraffin wax, polyethylene wax, and oxides thereof. From the viewpoint of the scratch resistance of the resulting coating and the dispersibility of component (c) in the composition, it is more preferable that component (c) contains at least one selected from oxidized paraffin wax and oxidized polyethylene wax, and it is even more preferable that component (c) contains oxidized paraffin wax.

[0064] The average particle size of component (c) depends on the thickness of the coating formed depending on the application of the composition, but is preferably 1 to 30 μm, more preferably 2 to 20 μm, and particularly preferably 3 to 15 μm, from the viewpoint of being able to easily form a coating with excellent scratch resistance. The average particle size of component (c) may be within the above range as long as the average particle size of component (c), which is a raw material when preparing the present composition, is within the above range.

[0065] The shape of component (c) is not particularly limited as long as the average particle size is within the above range. Component (c) is generally spherical, and preferably a true sphere, but its sphericity is not particularly limited.

[0066] The content of component (c) is preferably 0.5 to 10 mass%, more preferably 1 to 7.5 mass%, and particularly preferably 2 to 5 mass%, relative to 100 mass% of the solid content of the composition, from the viewpoint of being able to easily form a coating that has an excellent balance of scratch resistance, adhesion to the substrate, antibacterial properties, and antiviral properties.

[0067] Component (c) used as a raw material for the present composition [component (c) used when preparing the present composition] is not particularly limited, and may be an emulsion, but is preferably in the form of a powder or dispersion. The solid content in the dispersion is preferably 20% by mass or more, more preferably 35% by mass or more, and preferably 80% by mass or less, more preferably 65% ​​by mass or less, from the viewpoint of the stability of the dispersion. The dispersion is a dispersion in which the wax is dispersed in an aqueous medium. The water content in the aqueous medium and specific examples of the medium other than water are as described in the section for component (a).

[0068] As component (c), synthetic waxes produced by conventional methods may be used, or commercially available products such as those manufactured by Micro Powder, BYK, CLARIANT, and SHAMROCK may be used.

[0069] <Other ingredients> The present composition may contain components other than the above-mentioned components (a) to (c) as needed. As the other components, conventionally known additives that have been commonly used in the field of the present invention can be used within the range that does not impair the effects of the present invention, and examples thereof include discoloration inhibitors (d), insect repellents (e), film-forming aids, surface conditioners (leveling agents), water, organic solvents, antifoaming agents, dispersants, pH adjusters, thickeners, polymerization inhibitors, matting agents, anti-settling agents, heat stabilizers, ultraviolet absorbers, pigments, dyes, and natural waxes such as those derived from plants, animals, and minerals. The other components may each be used alone or in combination of two or more.

[0070] As the other component, for example, an inorganic powder other than component (b) may be used for the purpose of improving the hardness of the coating surface. Silica sol such as colloidal silica is typically used as the inorganic powder. In the present composition, an inorganic powder other than component (b) may also be used as the other component, but the present composition can easily form a coating having the desired scratch resistance without using an inorganic powder other than component (b). When the present composition contains an inorganic powder other than component (b), the content of the inorganic powder is preferably 0.1 to 5 parts by mass, more preferably 0.5 to 3 parts by mass, per 100 parts by mass of the solid content of the resin (a).

[0071] Furthermore, the present composition preferably does not contain an alkali-soluble resin. Such a composition that does not contain an alkali-soluble resin is a coating composition, and is different from resin waxes such as floor waxes and floor polishes, which usually contain an alkali-soluble resin.

[0072] [Component (d)] Although it depends on the substrate (application) to be coated, it is preferable to use component (d) in this composition. In particular, when a silver-containing compound is used as component (b), the resulting coating is prone to discoloration, so it is preferable to use component (d).

[0073] Component (d) is not particularly limited, and any conventionally known discoloration inhibitor can be used, but discoloration inhibitors having a nitrogen atom are preferred. Examples of the discoloration inhibitor having a nitrogen atom include heterocyclic compounds having a pyrrole ring, a pyrazole ring, a thiazole ring, an imidazole ring, a triazole ring, or a tetrazole ring, thioureas, and thiadiazoles.Specific examples of these discoloration inhibitors include the discoloration inhibitors described in JP-A-2019-14688. Examples of heterocyclic compounds having a triazole ring include benzotriazole compounds or alkali metal salts thereof, such as 1,2,3-benzotriazole, 1,2,3-benzotriazole sodium, 1,2,3-benzotriazole potassium, 4-methylbenzotriazole, 5-methylbenzotriazole, tolyltriazole, and carboxybenzotriazole.

[0074] When the present composition contains component (d), the content of component (d) is preferably 0.1 to 4 mass%, more preferably 0.2 to 2 mass%, relative to 100 mass% of the solid content of the present composition, from the viewpoint of being able to suppress discoloration of the resulting coating without impairing the above-mentioned effects of the present invention.

[0075] As component (d), a discoloration inhibitor produced by a conventional method may be used, or a commercially available product may be used, such as those manufactured by Sumika Environmental Science Co., Ltd., Daiwa Kasei Co., Ltd., and Asahi Co., Ltd.

[0076] [Component (e)] As the component (e), conventionally known insect repellents can be used, and specific examples include anionic or nonionic pyrethroid compounds including permethrin (hereinafter also referred to as "component (e1)"), and insect repellents other than component (e1) (hereinafter also referred to as "component (e2)"). Among these, it is preferable to use the component (e1) because it can exert mite repellent properties and insect repellent properties including knocking down mosquitoes. As the component (e1) and the component (e2), conventionally known insect repellents can be used.

[0077] The component (e1) may contain other pyrethroid compounds in addition to permethrin, and the other pyrethroid compounds may be natural pyrethroid compounds or synthetic pyrethroid compounds. Examples of natural pyrethroid compounds include pyrethrin, cinerin, and jasmolin. Synthetic pyrethroid compounds are a general term for synthetic compounds that have a chemical structure similar to that of natural pyrethroids, and examples include allethrin, empenthrin, tetramethrin, α-cypermethrin, resmethrin, prallethrin, imiprothrin, deltamethrin, transfluthrin, profluthrin, metofluthrin, silafluofen, furamethrin, fenothrin, cyphenothrin, veratrine, etofenprox, cyfluthrin, and momfluorothrin.

[0078] The content of permethrin in the component (e1) is preferably 50% by mass or more, more preferably 75% by mass or more, relative to 100% by mass of component (e1), from the viewpoint of easily forming a coating with excellent insect repellent properties, including mosquito knockdown, and the upper limit is preferably 100% by mass.

[0079] When the present composition contains component (e1), the content of component (e1) is preferably 0.1 to 10 mass%, more preferably 1 to 8 mass%, and particularly preferably 2 to 6 mass%, relative to 100 mass% of the solids content of the present composition, from the viewpoint of being able to easily form a coating that has a good balance between mite repellency and insect repellency, including mosquito knockdown, adhesion to the substrate, and scratch resistance.

[0080] As component (e1) used as a raw material for the present composition [component (e1) used in preparing the present composition], an aqueous dispersion of component (e1), particularly an emulsion, is preferred, since the present composition, which is an aqueous paint composition, can be easily prepared and a coating having the desired physical properties can be easily formed. The solid content of component (e1) in the aqueous dispersion or emulsion is preferably 20% by mass or more, more preferably 35% by mass or more, and preferably 80% by mass or less, more preferably 65% ​​by mass or less, from the viewpoint of the stability of the emulsion. The aqueous dispersion or emulsion is a dispersion in which the compound is dispersed in an aqueous medium. The water content in the aqueous medium and specific examples of the medium other than water are as described in the section for component (a).

[0081] The aqueous dispersion or emulsion may be prepared by dispersing an anionic or nonionic pyrethroid compound containing permethrin in an aqueous medium by a known method, or may be a commercially available product, such as those manufactured by Daiwa Chemical Industry Co., Ltd., Nippon Soda Co., Ltd., or Fujifilm Wako Pure Chemical Industries, Ltd.

[0082] Examples of the component (e2) include phenylpropanoid compounds such as cinnamic acid and its derivatives, cyclic sesquiterpene compounds, and natural essential oils, and specific examples of these include the compounds described in JP 2017-114770 A. Among these, cinnamic acid and its derivatives are preferred. The component (e2) may be one to which a preservative has been added, which has been gelled, which has been encapsulated in cyclodextrin or the like, or which has been microencapsulated, in order to enhance the durability of its effect.

[0083] When the present composition contains component (e2), the content of component (e2) is preferably 0.4 to 15% by mass, more preferably 0.8 to 10% by mass, relative to 100% by mass of the solid content of the present composition, from the viewpoint of easily forming a coating having superior insect repellency, such as mite repellency, without impairing the above-mentioned effects of the present invention.

[0084] The component (e2) may be a component (e2) produced by a conventional method, or may be a commercially available product, such as those manufactured by Yamato Chemical Industry Co., Ltd., Miki Riken Kogyo Co., Ltd., or Kumiai Chemical Industry Co., Ltd.

[0085] [Film-forming agent] Since the present composition contains water, the composition may freeze in winter, and from the viewpoint of improving film-forming properties at low temperatures and the finished appearance of the resulting coating, it is preferable to include a film-forming aid.

[0086] The film-forming aid may be one that is commonly used in aqueous coating compositions, and examples thereof include linear or branched aliphatic alcohols having 5 to 10 carbon atoms; alcohols having an aromatic ring; monoethers such as (poly)ethylene glycol or (poly)propylene glycol; (poly)ethylene glycol ether esters; and (poly)propylene glycol ether esters.

[0087] When the present composition contains a film-forming aid, the content of the film-forming aid is preferably 0.1 to 10 mass %, more preferably 0.3 to 5 mass %, relative to 100 mass % of the present composition, from the viewpoint of being able to easily form a coating that has excellent film-forming properties at low temperatures and excellent appearance.

[0088] As the film-forming aid, a film-forming aid produced by a conventionally known method may be used, or a conventionally known commercially available product may be used.

[0089] [Surface conditioner] The present composition preferably contains a surface conditioner, which improves repelling of the coating when the composition is applied, improves wettability to the substrate surface, and makes it easier to form a coating with a uniform thickness. The surface conditioner is not particularly limited, but examples thereof include various surface conditioners (leveling agents) such as fluorine-based, acrylic-based, and silicone-based. When the present composition contains a surface conditioner, the content of the surface conditioner is preferably 0.005 to 1.5 mass %, more preferably 0.01 to 1.0 mass %, relative to 100 mass % of the solid content of the present composition. As the surface conditioner, a surface conditioner produced by a conventionally known method may be used, or a conventionally known commercially available product may be used.

[0090] [water] As the raw materials for the components (a) and (b), it is preferable to use an aqueous dispersion or an aqueous solution. In this case, the resulting composition contains water. However, from the viewpoints of making it easier to prepare the present composition and easily obtaining a composition that is superior in storage stability and coating workability, it is preferable to further blend water in addition to the water that may be contained in the raw materials such as the components (a) and (b). The water is not particularly limited, and tap water or the like may be used, but it is preferable to use pure water or ion-exchanged water. The amount of water used is preferably such that the content of water in the composition falls within the above range.

[0091] <Present composition> The present composition can be prepared by mixing the above-mentioned components by known means.

[0092] The present composition can be suitably used as an aqueous aftercoat paint. Furthermore, by periodically maintaining a substrate using the present composition as an aqueous aftercoat paint, the above-mentioned effects can be constantly imparted to the substrate. Furthermore, the present composition can be suitably used as a coating material for on-site painting of residential spaces and the like, since it can more effectively exhibit the effects of the present invention.

[0093] The use of the composition is not particularly limited, but it can be suitably used in homes and other places where an unspecified number of people come and go. Since the present composition is a water-based coating composition, it can be easily and safely applied to a substrate (object to be coated) using a brush or the like, and there are no particular limitations on the substrate as long as it adheres to the substrate. Specifically, the composition can be used in a variety of products and equipment used in homes, public facilities (including medical facilities such as hospitals, elderly care facilities, early childhood facilities such as kindergartens, educational facilities such as schools, parks, government offices, stations, airports, etc.), public transportation, office buildings, department stores, entertainment facilities, various manufacturing facilities for pharmaceuticals and food, restaurants, livestock facilities, etc. Specific examples include interior materials such as flooring (including PVC sheet flooring, etc.), fixtures, wall materials, and ceiling materials; aluminum sashes, screen doors, and veranda fences; outdoor products (including tent fabrics, metal members, plastic members, etc.); various tiles; various buttons such as doorknobs, door handles, levers, water faucets, handrails, straps, elevator buttons, and light buttons; toilet components such as toilet bowls and toilet paper holders; bathroom components such as bathtubs and bathroom surfaces; kitchen and washroom components; and materials that come into contact with hands, such as benches, chairs, and playground equipment.

[0094] ≪Coating, base material with coating≫ The coating according to the present invention is a film formed from the present composition, and specifically, can be produced by including a step of drying the present composition (drying step). The coating is usually formed on a substrate, i.e., a coated substrate comprising the substrate and the coating. Specifically, the coated substrate can be produced by a coating step of coating the composition on at least a portion of the substrate and a drying step of drying the coated composition. In addition to the above steps, known steps may be carried out as necessary when producing the coated substrate.

[0095] The (dry) film thickness of the coating is not particularly limited as long as it is thick enough to exhibit the desired functions, but is usually 1 to 20 μm, preferably 3 to 10 μm, from the viewpoint of easily protecting the substrate from dirt, scratches, etc. Furthermore, when the (dry) film thickness is within this range, a coated substrate having excellent scratch resistance, antibacterial properties, and antiviral properties can be easily formed. When forming a coating having such a (dry) thickness, it is preferable to form a coating of the desired thickness in a single application.

[0096] The substrate is not particularly limited, and may be any substrate on which the coating film is to be formed, and examples thereof include wood (wood substrates), plastic, paper, metal, glass, ceramics, concrete, brick, and pottery. Examples of the plastic include various plastic substrates (e.g., films and molded articles formed from triacetyl cellulose, polyethylene terephthalate (PET), diacetyl cellulose, acetate butyrate cellulose, polyolefin, polyvinyl chloride, polyethersulfone, polyacrylic, polyurethane, polyester, polycarbonate, polysulfone, polyether, polymethylpentene, polyether ketone, (meth)acrylonitrile, etc.).

[0097] As the substrate, a wood substrate is preferred, and wood flooring is more preferred, in terms of enabling the effects of the present invention to be more effectively exhibited. The wood substrate may be a veneer-covered, paper-covered or sheet-covered substrate, or may be solid wood. Furthermore, the substrate may be a substrate whose surface has been previously subjected to a conventionally known sealing treatment, coloring treatment, or the like, as required, or a substrate coated with a conventionally known undercoat paint, intermediate paint, topcoat paint, or the like. The primer paint, intermediate paint, and top coat paint may be conventionally known paints, and may be applied by any method generally used for applying paints.

[0098] The coating method in the coating step may be appropriately selected depending on the composition of the present composition used, the type of substrate, and the like, and examples thereof include brush coating, trowel brush coating, roll coating, spray coating, dip coating, air knife coating, curtain coating, wire bar coating, gravure coating, and extrusion coating.

[0099] The amount of the composition to be applied to the substrate is not particularly limited, but it is preferable to apply the composition so that the thickness of the resulting coating falls within the above range, from the viewpoint of easily protecting the substrate from dirt, scratches, etc., and specifically, from 10 to 30 g / m2 is preferred. When the amount of the composition applied is within this range, a coated substrate having excellent scratch resistance, antibacterial properties, and antiviral properties can be easily obtained.

[0100] The drying step may be carried out at room temperature (for example, 5 to 30°C), or may be carried out under heating at about 5 to 50°C in order to shorten the drying time. This composition has excellent drying properties, and can quickly form a coating (dried coating) even when dried at room temperature (e.g., in 0.2 to 0.25 hours when dried at 20°C and 45% RH). [Example]

[0101] The present invention will be described in detail below based on examples, but the present invention is not limited to the following examples. The compositions of the following examples and comparative examples can be prepared using the components described in the above section "Water-based paint composition," particularly preferred components among them. Specifically, they were prepared using the commercially available products described in the above section "Water-based paint composition."

[0102] [Example 1] An aqueous coating composition was prepared by thoroughly stirring 30 parts by mass of resin emulsion 1, 30 parts by mass of resin emulsion 2, 6 parts by mass of antiviral agent 1, 1 part by mass of synthetic wax 1, 1 part by mass of anti-tarnish agent, 0.5 parts by mass of film-forming aid, 0.2 parts by mass of surface conditioner, and 31.3 parts by mass of pure water.

[0103] [Examples 2 to 4 and Comparative Examples 1 to 7] A water-based coating composition was prepared in the same manner as in Example 1, except that the components shown in Table 1 were used in the amounts (parts by mass) shown in Table 1 instead of the raw materials used in Example 1. The details of each component in Table 1 are as shown in Table 2.

[0104] <Dryness (to touch)> A water-based paint composition was applied to a commercially available wooden floor material (15 cm long x 10 cm wide) with a brush at a rate of 20.0 g / m 2The wood floor material coated with the water-based coating composition was placed at 20°C and 45% RH, and the water-based coating composition was touched with a finger at predetermined intervals after coating and evaluated according to the following criteria. The results are shown in Table 1. (Evaluation criteria) ○: When the applied water-based coating composition was lightly touched with the pad of a finger, the time until no finger mark remained was less than 15 minutes after application of the water-based coating composition. △: When the applied water-based coating composition was lightly touched with the pad of a finger, the time until no finger mark remained was 15 minutes or more but less than 20 minutes after the application of the water-based coating composition. ×: When the applied water-based coating composition was lightly touched with the pad of a finger, it took 20 minutes or more for the finger mark to disappear from the surface after application of the water-based coating composition.

[0105] <Drying property (surface condition (tack))> A water-based paint composition was applied to a commercially available wooden floor material (15 cm long x 10 cm wide) with a brush at a rate of 20.0 g / m 2 The wood floor material coated with the water-based coating composition was placed at 20°C and 45% RH and dried for 1 hour to produce a coated substrate. The remaining tack of the resulting coating was checked by pressing firmly with the pad of a finger and evaluated according to the following criteria. The results are shown in Table 1. (Evaluation criteria) ○: No tack △: Slightly sticky (no sticky residue left on the pads of the fingers) ×: Sticky (sticky residue remains on the pads of the fingers)

[0106] <Drying property (surface condition (cracks))> A water-based paint composition was applied to a commercially available wooden floor material (15 cm long x 10 cm wide) with a brush at a rate of 20.0 g / m 2The wood floor material coated with the water-based coating composition was placed at 20°C and 45% RH and dried for 1 hour to produce a coated substrate. The resulting coating was visually inspected for cracks and evaluated based on the following criteria. The results are shown in Table 1. (Evaluation criteria) ○: No cracks △: (Slight) cracks occurred in part of the coating ×: Cracks occurred on the entire surface

[0107] <Preparation of test specimens> A water-based paint composition was applied to a commercially available wooden floor material (15 cm long x 10 cm wide) with a brush at a rate of 20.0 g / m 2 The coating was dried at room temperature (about 10 to 20°C) for 16 hours or more to prepare a test piece (coated substrate). The following tests were carried out using the obtained test pieces, and the results are shown in Table 1.

[0108] <Scratch resistance> A 10-yen coin was placed at a 45° angle against the coating surface of the test piece, and the coating surface was rubbed 3 cm (one way) while applying a load of 400 g. The condition of the coating was then visually judged and evaluated based on the following evaluation criteria. (Evaluation criteria) ○: The coating did not peel off from the substrate, and there were no scratches on the coating surface. △: Slight scratches remained on the coating surface ×: The coating peeled off from the substrate, leaving large scratches on the coating surface ××: The coating was sticky and peeled off from the substrate immediately when rubbed with a 10-yen coin.

[0109] <Antibacterial> The antibacterial properties of the coating on the obtained test piece were evaluated in accordance with the film adhesion method of JIS Z 2801:2010, specifically by the following method. Test bacteria (Escherichia coli NBRC 3972 or Staphylococcus aureus NBRC 12732) cultured in NA medium were used to obtain a bacterial count of 2.5 to 10 × 10 5 A test bacterial solution was obtained by adding NB medium to an appropriate concentration to a solution adjusted with sterile purified water to a concentration of 1 / ml. A 5 cm square test piece was placed in a petri dish with the coating side facing up, and 0.4 ml of test bacterial solution was inoculated onto the coating surface of the test piece. The resulting test piece was covered with a 4 cm square polyethylene film, which was lightly pressed so that the test bacterial solution spread throughout the polyethylene film, and then left for 24 hours under conditions of 35°C and 95% humidity. After 24 hours, 10 ml of SCDLP medium was added to the petri dish to wash out the bacteria adhering to the coating of the test piece. The number of viable bacteria in 1 ml of the washed-out liquid was measured using SA medium. A control test was carried out in the same manner except that 0.4 ml of the test bacterial solution was inoculated into an empty petri dish, and the viable bacterial count was measured. The antibacterial activity value was calculated based on the following formula and evaluated based on the following evaluation criteria. Antibacterial activity value = Common logarithm of the number of viable bacteria in the control test - Common logarithm of the number of viable bacteria in the test using the test strip (Evaluation criteria) ○: Antibacterial activity value is 2.0 or more △: Antibacterial activity value is 0.5 or more and less than 2.0 ×: Antibacterial activity value is less than 0.5

[0110] <Antiviral> The antiviral properties of the coating on the obtained test specimens were evaluated in accordance with ISO 21702, specifically by the following method. The following host cells were infected with the virus and cultured to prepare virus suspensions of the specified concentrations. A 5 cm square test specimen was placed in a petri dish with the coating side facing up, and 0.4 ml of the virus suspension was inoculated onto the coating surface of the test specimen. The resulting test specimen was covered with a 4 cm square polyethylene film and gently pressed to ensure that the virus suspension was distributed throughout the polyethylene film. The resulting specimen was then stored in a temperature- and humidity-controlled chamber at 25°C for 24 hours. After 24 hours, a washout solution (10 ml of SCDLP medium supplemented with fetal bovine serum to a final concentration of 10%) was added to the petri dish to wash out the virus adhering to the test specimen coating. The washed solution was serially diluted with the dilution medium described below to obtain virus solutions. (influenza virus) Virus strain: Influenza A virus (H3N2, A / Hong Kong / 8 / 68; TC adapted ATCC VR-1679) Host cells: MDCK cells (canine kidney-derived cells) Dilution medium: EMEM (Feline calicivirus [a surrogate for norovirus]) Virus strain: Feline calicivirus; Strain: F-9 ATCC VR-782 Host cells: CRFK cells (cat kidney-derived cells) Dilution medium: DMEM

[0111] Epithelial cells were infected with each of the serially diluted virus solutions, and the virus infectivity titer was measured by plaque assay. A control test was conducted in the same manner, except that a 5 cm square polyethylene film was used instead of the test piece, and the virus infectivity was measured. The antiviral activity value was calculated based on the following formula and evaluated based on the following evaluation criteria. Antiviral activity value = virus infectivity in the control test - virus infectivity in the test using the test strip (Evaluation criteria) ◎: Antiviral activity values ​​for both influenza virus and feline calicivirus are 2.0 or higher ○: Either the influenza virus or feline calicivirus antiviral activity value is 2.0 or higher ○△: Antiviral activity values ​​for influenza virus and feline calicivirus are both 0.5 or greater and less than 2.0 △: One of the antiviral activity values ​​for influenza virus and feline calicivirus is 0.5 or more and less than 2.0, and one of the antiviral activity values ​​for influenza virus and feline calicivirus is less than 0.5 ×: Antiviral activity values ​​for both influenza virus and feline calicivirus are less than 0.5

[0112] [Table 1]

[0113] [Table 2]

[0114] The coated surface of the test piece obtained in Example 4 was subjected to the following insect repellency tests (mite repellency test and mosquito knockdown test). As a result, the evaluation result in the mite repellency test described below was ○, and the evaluation result in the mosquito knockdown test described below was ○, and it was found that the test piece obtained in Example 4 has an excellent balance of drying properties, scratch resistance, insect repellency including mosquito knockdown (particularly mosquito knockdown properties and mite repellency), antibacterial properties (particularly antibacterial properties against Escherichia coli and Staphylococcus aureus), and antiviral properties (particularly antiviral properties against enveloped viruses such as influenza virus and non-enveloped viruses such as feline calicivirus (a norovirus surrogate)).

[0115] ·Mite repellency test The mite repellency of the coating of the test piece obtained in Example 4 was evaluated in accordance with the intrusion prevention method of JIS L 1920:2007, specifically by the following method. A medium containing approximately 3,000 live mites (Dermatophagoides pteronyssinus) was evenly spread in a 90 mm diameter, 20 mm high dish. A 50 mm x 50 mm plastic plate was placed in the center of the dish, and the test specimen was placed on top of the plate with the coating side facing up. Powdered food for attracting mites was placed on the center of the coating of the test specimen. The dish was left at 25°C and 75% RH for 24 hours, and the number of live mites on the test specimen was then counted. As a control, a substrate without any coating of the water-based paint composition was used instead of the test piece, and the number of surviving mites on the substrate was counted in the same manner as above. The mite repellency rate was calculated based on the following formula and evaluated based on the following evaluation criteria: The test was carried out three times for each test piece, and the average number of mites from the three tests was used in the formula below. Mite repellency rate (%) = (1 - number of mites on test piece / number of mites on substrate) x 100 (Evaluation criteria) ○: Mite repellency rate is 50% or more △: Mite repellency rate is 5% or more but less than 50% ×: Mite repellency rate is less than 5%

[0116] Mosquito knockdown test A cube measuring 5 cm square was prepared with three sides serving as the test piece and the remaining three sides serving as unprocessed mesh (with the coated surface of the test piece facing the inner surface of the cube). Ten adult female Aedes albopictus mosquitoes anesthetized with carbon dioxide were released into the cube, and after leaving it for 300 minutes at room temperature of 25°C and humidity of 65%, the number of dead mosquitoes in the cube (knockdown number) was observed and evaluated based on the following evaluation criteria. (Evaluation criteria) ○: One or more animals were knocked down ×: No animals were knocked down

[0117] In addition, the coated surface of the test piece obtained in Example 4 was subjected to a caster resistance test (1000 reciprocations) based on JIS A 1454:2016, and then an insect repellent test was conducted in the same manner as above, and it was confirmed that there was no decrease in the insect repellent effect.

Claims

1. An anionic or nonionic resin (a); an anionic or nonionic antiviral agent (b); Synthetic wax (c) Contains The resin (a) includes a resin (a1) having a glass transition temperature of 0°C or lower and a resin (a2) having a glass transition temperature of 50°C or higher. A water-based paint composition, the content of the resin (a) is 70 to 99% by mass relative to 100% by mass of the solid content of the aqueous coating composition; The content of the synthetic wax (c) is 0.5 to 10 mass% relative to 100 mass% of the solid content of the aqueous coating composition. Water-based paint composition.

2. The water-based coating composition according to claim 1 , wherein the resin (a) comprises an acrylic resin.

3. 3. The aqueous coating composition according to claim 1, wherein the content of said resin (a1) is 20 to 80 mass% relative to 100 mass% of the total of said resins (a1) and (a2).

4. The aqueous coating composition according to any one of claims 1 to 3, wherein the antiviral agent (b) is an inorganic antiviral agent.

5. 5. The aqueous coating composition according to claim 1, wherein the synthetic wax (c) comprises at least one selected from paraffin wax, polyethylene wax, and oxides thereof.

6. The aqueous coating composition according to any one of claims 1 to 5, further comprising a discoloration inhibitor (d).

7. The water-based coating composition according to any one of claims 1 to 6, which is for use on wood substrates.

8. A coating formed from the water-based coating composition according to any one of claims 1 to 7.

9. A coated substrate comprising a substrate and the coating according to claim 8.

Images