Water-based coating material

Abstract

To provide an aqueous coating having excellent clearness.SOLUTION: A aqueous coating uses synthetic resin emulsion as a binder and contains an ethylene glycol ether solvent and a propyleneglycol ether solvent at a specific ratio.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an aqueous coating material having excellent transparency.

Background Art

[0002] Conventionally, on the walls of building exteriors and the like, films have been formed with various coating materials for the purpose of protecting the base materials and improving the aesthetic appearance. However, since such walls are exposed outdoors for a long time, they deteriorate due to the influence of sunlight, rainfall, etc., and the initial aesthetic appearance deteriorates over time.

[0003] On the other hand, in order to suppress the progress of wall deterioration and maintain the initial aesthetic appearance over a long period of time, a method of applying a transparent coating material has been carried out.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] For example, Patent Document 1 describes a clear paint excellent in weather resistance and the like containing an aqueous resin dispersion and a crosslinking agent, and it is also described that film-forming aids such as ethylene glycol monobutyl ether and Texanol are used in the clear paint (paragraph 0054). By using such a film-forming aid, even an aqueous resin can form a uniform coating film, and a coating film excellent in clarity and weather resistance can be formed.

[0006] However, even in Patent Document 1, there are cases where the clarity is insufficient, and the development of a material with further excellent clarity is desired.

Means for Solving the Problems

[0007] In order to solve such problems, as a result of intensive studies, the inventors of the present invention have found that an aqueous coating material containing an ethylene glycol ether solvent and a propylene glycol ether solvent in a mixing ratio of 0.1:99.9 to 49.9:50.1 together with a synthetic resin emulsion is excellent in the clarity of the formed coating film, and have thus completed the present invention.

[0008] That is, the present invention has the following features. 1. obtained by polymerizing a monomer having ultraviolet absorption performance and / or light stability performance An aqueous coating material using a synthetic resin emulsion as a binder, wherein the aqueous coating material further contains an ethylene glycol ether solvent and a propylene glycol ether solvent in a mixing ratio of 0.1:99.9 to 49.9:50.1. 2. The aqueous coating material according to 1., wherein the monomer having ultraviolet absorption performance and / or light stability performance is one or more selected from benzophenone-based monomers, benzotriazole-based monomers, and piperidine-based monomers. 3. An aqueous coating material using a synthetic resin emulsion as a binder and containing an ultraviolet absorber and / or a light stabilizer, wherein the aqueous coating material further contains an ethylene glycol ether solvent and a propylene glycol ether solvent in a mixing ratio of 0.1:99.9 to 49.9:50.1. 4. The total amount of the ethylene glycol ether solvent and the propylene glycol ether solvent is 1 part by weight or more and 50 parts by weight or less with respect to 100 parts by weight of the solid content of the synthetic resin emulsion. According to any one of 1. to 3. Aqueous coating material.

Effect of the Invention

[0009] The aqueous coating material of the present invention is excellent in clarity.

Mode for Carrying Out the Invention

[0010] Hereinafter, a mode for carrying out the present invention will be described.

[0011] The present invention is an aqueous coating material using a synthetic resin emulsion as a binder, wherein the aqueous coating material further contains an ethylene glycol ether solvent and a propylene glycol ether solvent in a mixing ratio of 0.1:99.9 to 49.9:50.1 (preferably 0.5:99.5 to 49.5:50.5, more preferably 5:95 to 45:55). The mechanism of the present invention is not limited to the following, but the propylene glycol ether solvent is likely to be mainly arranged on the side of the synthetic resin emulsion particles, and the ethylene glycol ether solvent is likely to be mainly arranged outside the synthetic resin emulsion particles. During the film-forming process, the coalescence of the synthetic resin emulsion particles can be uniformly carried out without unevenness, and uniform film formation can proceed from the initial stage of the film-forming process, and it is considered that a coating film with excellent clarity, without unevenness and cloudiness, can be formed. In the present invention, it has been found that a coating film with excellent clarity, without unevenness and cloudiness, can be obtained by having the above mixing ratio. In addition, the aqueous coating material of the present invention can form a coating film with excellent clarity, without unevenness and cloudiness, even when it is overcoated or thick-coated, and even when it is an aqueous coating material containing a synthetic resin emulsion with a high glass transition temperature or a synthetic resin emulsion with a high crosslinking density, an aqueous coating material containing a crosslinking agent, or an aqueous coating material containing a light stabilizer or an ultraviolet absorber.

[0012] Examples of the ethylene glycol ether solvent used in the present invention include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol mono-i-propyl ether, ethylene glycol mono-n-butyl ether, ethylene glycol mono-i-butyl ether, ethylene glycol mono-t-butyl ether, ethylene glycol mono-n-hexyl ether, ethylene glycol monophenyl ether, ethylene glycol monobenzyl ether, ethylene glycol mono-2-ethylhexyl ether and other ethylene glycol monoalkyl ethers, Ethylene glycol monoalkyl ether acetates such as ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monopropyl ether acetate, ethylene glycol monobutyl ether acetate, ethylene glycol monohexyl ether acetate, ethylene glycol monophenyl ether acetate, ethylene glycol monobenzyl ether acetate, ethylene glycol mono(2-ethylhexyl) ether acetate, Ethylene glycol dialkyl ethers such as ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dipropyl ether, ethylene glycol dibutyl ether, ethylene glycol dihexyl ether, ethylene glycol diphenyl ether, ethylene glycol dibenzyl ether, ethylene glycol di(2-ethylhexyl) ether, Ethylene glycol dialkyl ether acetates such as ethylene glycol dimethyl ether acetate, ethylene glycol diethyl ether acetate, ethylene glycol dipropyl ether acetate, ethylene glycol dibutyl ether acetate, ethylene glycol dihexyl ether acetate, ethylene glycol diphenyl ether acetate, ethylene glycol dibenzyl ether acetate, ethylene glycol di(2-ethylhexyl) ether acetate, Diethylene glycol monoalkyl ethers such as diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, diethylene glycol mono(i-propyl) ether, diethylene glycol mono(n-butyl) ether, diethylene glycol mono(i-butyl) ether, diethylene glycol mono(t-butyl) ether, diethylene glycol mono(n-hexyl) ether, diethylene glycol monophenyl ether, diethylene glycol monobenzyl ether, diethylene glycol mono(2-ethylhexyl) ether, Diethylene glycol monoalkyl ether acetates such as diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monopropyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monohexyl ether acetate, diethylene glycol monophenyl ether acetate, diethylene glycol monobenzyl ether acetate, diethylene glycol mono-2-ethylhexyl ether acetate, Diethylene glycol dialkyl ethers such as diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dipropyl ether, diethylene glycol dibutyl ether, diethylene glycol dihexyl ether, diethylene glycol diphenyl ether, diethylene glycol dibenzyl ether, diethylene glycol di-2-ethylhexyl ether, Diethylene glycol dialkyl ether acetates such as diethylene glycol dimethyl ether acetate, diethylene glycol diethyl ether acetate, diethylene glycol dipropyl ether acetate, diethylene glycol dibutyl ether acetate, diethylene glycol dihexyl ether acetate, diethylene glycol diphenyl ether acetate, diethylene glycol dibenzyl ether acetate, diethylene glycol di-2-ethylhexyl ether acetate, Triethylene glycol monoalkyl ethers such as triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monopropyl ether, triethylene glycol mono-i-propyl ether, triethylene glycol mono-n-butyl ether, triethylene glycol mono-i-butyl ether, triethylene glycol mono-t-butyl ether, triethylene glycol mono-n-hexyl ether, triethylene glycol monophenyl ether, triethylene glycol monobenzyl ether, triethylene glycol mono-2-ethylhexyl ether, Triethylene glycol monomethyl ether acetate, triethylene glycol monoethyl ether acetate, triethylene glycol monopropyl ether acetate, triethylene glycol monobutyl ether acetate, triethylene glycol monohexyl ether acetate, triethylene glycol monophenyl ether acetate, triethylene glycol monobenzyl ether acetate, triethylene glycol mono-2-ethylhexyl ether acetate and other triethylene glycol monoalkyl ether acetates, Triethylene glycol dimethyl ether, triethylene glycol diethyl ether, triethylene glycol dipropyl ether, triethylene glycol dibutyl ether, triethylene glycol dihexyl ether, triethylene glycol diphenyl ether, triethylene glycol dibenzyl ether, triethylene glycol di-2-ethylhexyl ether and other triethylene glycol dialkyl ethers, Triethylene glycol dimethyl ether acetate, triethylene glycol diethyl ether acetate, triethylene glycol dipropyl ether acetate, triethylene glycol dibutyl ether acetate, triethylene glycol dihexyl ether acetate, triethylene glycol diphenyl ether acetate, triethylene glycol dibenzyl ether acetate, triethylene glycol di-2-ethylhexyl ether acetate and other triethylene glycol dialkyl ether acetates, Tetraethylene glycol monomethyl ether, tetraethylene glycol monoethyl ether, tetraethylene glycol monopropyl ether, tetraethylene glycol mono-i-propyl ether, tetraethylene glycol mono-n-butyl ether, tetraethylene glycol mono-i-butyl ether, tetraethylene glycol mono-t-butyl ether, tetraethylene glycol mono-n-hexyl ether, tetraethylene glycol monophenyl ether, tetraethylene glycol monobenzyl ether, tetraethylene glycol mono-2-ethylhexyl ether and other tetraethylene glycol monoalkyl ethers, Tetraethylene glycol monoalkyl ether acetates such as tetraethylene glycol monomethyl ether acetate, tetraethylene glycol monoethyl ether acetate, tetraethylene glycol monopropyl ether acetate, tetraethylene glycol monobutyl ether acetate, tetraethylene glycol monohexyl ether acetate, tetraethylene glycol monophenyl ether acetate, tetraethylene glycol monobenzyl ether acetate, tetraethylene glycol mono-2-ethylhexyl ether acetate, Tetraethylene glycol dialkyl ethers such as tetraethylene glycol dimethyl ether, tetraethylene glycol diethyl ether, tetraethylene glycol dipropyl ether, tetraethylene glycol dibutyl ether, tetraethylene glycol dihexyl ether, tetraethylene glycol diphenyl ether, tetraethylene glycol dibenzyl ether, tetraethylene glycol di-2-ethylhexyl ether, Tetraethylene glycol dialkyl ether acetates such as tetraethylene glycol dimethyl ether acetate, tetraethylene glycol diethyl ether acetate, tetraethylene glycol dipropyl ether acetate, tetraethylene glycol dibutyl ether acetate, tetraethylene glycol dihexyl ether acetate, tetraethylene glycol diphenyl ether acetate, tetraethylene glycol dibenzyl ether acetate, tetraethylene glycol di-2-ethylhexyl ether acetate, and the like, and one or more of these can be used. In particular, in the present invention, it is preferable to use one or more selected from diethylene glycol monoalkyl ethers, diethylene glycol monoalkyl ether acetates, triethylene glycol monoalkyl ethers, and triethylene glycol monoalkyl ether acetates.

[0013] Examples of the propylene glycol ether solvent used in the present invention include Propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol mono-i-propyl ether, propylene glycol mono-n-butyl ether, propylene glycol mono-i-butyl ether, propylene glycol mono-t-butyl ether, propylene glycol mono-n-hexyl ether, propylene glycol monophenyl ether, propylene glycol monobenzyl ether, propylene glycol mono-2-ethylhexyl ether and other propylene glycol monoalkyl ethers, Propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, propylene glycol monobutyl ether acetate, propylene glycol monohexyl ether acetate, propylene glycol monophenyl ether acetate, propylene glycol monobenzyl ether acetate, propylene glycol mono-2-ethylhexyl ether acetate and other propylene glycol monoalkyl ether acetates, Propylene glycol dimethyl ether, propylene glycol diethyl ether, propylene glycol dipropyl ether, propylene glycol dibutyl ether, propylene glycol dihexyl ether, propylene glycol diphenyl ether, propylene glycol dibenzyl ether, propylene glycol di-2-ethylhexyl ether and other propylene glycol dialkyl ethers, Propylene glycol dimethyl ether acetate, propylene glycol diethyl ether acetate, propylene glycol dipropyl ether acetate, propylene glycol dibutyl ether acetate, propylene glycol dihexyl ether acetate, propylene glycol diphenyl ether acetate, propylene glycol dibenzyl ether acetate, propylene glycol di-2-ethylhexyl ether acetate and other propylene glycol dialkyl ether acetates, Dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monoisopropyl ether, dipropylene glycol monon-butyl ether, dipropylene glycol monoisobutyl ether, dipropylene glycol monot-butyl ether, dipropylene glycol monon-hexyl ether, dipropylene glycol monophenyl ether, dipropylene glycol monobenzyl ether, dipropylene glycol mono-2-ethylhexyl ether and other dipropylene glycol monoalkyl ethers, Dipropylene glycol monomethyl ether acetate, dipropylene glycol monoethyl ether acetate, dipropylene glycol monopropyl ether acetate, dipropylene glycol monobutyl ether acetate, dipropylene glycol monhexyl ether acetate, dipropylene glycol monophenyl ether acetate, dipropylene glycol monobenzyl ether acetate, dipropylene glycol mono-2-ethylhexyl ether acetate and other dipropylene glycol monoalkyl ether acetates, Dipropylene glycol dimethyl ether, dipropylene glycol diethyl ether, dipropylene glycol dipropyl ether, dipropylene glycol dibutyl ether, dipropylene glycol dihexyl ether, dipropylene glycol diphenyl ether, dipropylene glycol dibenzyl ether, dipropylene glycol di-2-ethylhexyl ether and other dipropylene glycol dialkyl ethers, Dipropylene glycol dimethyl ether acetate, dipropylene glycol diethyl ether acetate, dipropylene glycol dipropyl ether acetate, dipropylene glycol dibutyl ether acetate, dipropylene glycol dihexyl ether acetate, dipropylene glycol diphenyl ether acetate, dipropylene glycol dibenzyl ether acetate, dipropylene glycol di-2-ethylhexyl ether acetate and other dipropylene glycol dialkyl ether acetates, Tripropylene glycol monomethyl ether, tripropylene glycol monoethyl ether, tripropylene glycol monopropyl ether, tripropylene glycol monoisopropyl ether, tripropylene glycol monon-butyl ether, tripropylene glycol monoisobutyl ether, tripropylene glycol monot-butyl ether, tripropylene glycol monon-hexyl ether, tripropylene glycol monophenyl ether, tripropylene glycol monobenzyl ether, tripropylene glycol mono-2-ethylhexyl ether and other tripropylene glycol monoalkyl ethers, Tripropylene glycol monomethyl ether acetate, tripropylene glycol monoethyl ether acetate, tripropylene glycol monopropyl ether acetate, tripropylene glycol monobutyl ether acetate, tripropylene glycol monhexyl ether acetate, tripropylene glycol monophenyl ether acetate, tripropylene glycol monobenzyl ether acetate, tripropylene glycol mono-2-ethylhexyl ether acetate and other tripropylene glycol monoalkyl ether acetates, Tripropylene glycol dimethyl ether, tripropylene glycol diethyl ether, tripropylene glycol dipropyl ether, tripropylene glycol dibutyl ether, tripropylene glycol dihexyl ether, tripropylene glycol diphenyl ether, tripropylene glycol dibenzyl ether, tripropylene glycol di-2-ethylhexyl ether and other tripropylene glycol dialkyl ethers, Tripropylene glycol dimethyl ether acetate, tripropylene glycol diethyl ether acetate, tripropylene glycol dipropyl ether acetate, tripropylene glycol dibutyl ether acetate, tripropylene glycol dihexyl ether acetate, tripropylene glycol diphenyl ether acetate, tripropylene glycol dibenzyl ether acetate, tripropylene glycol di(2-ethylhexyl) ether acetate and other tripropylene glycol dialkyl ether acetates, Tetrapropylene glycol monomethyl ether, tetrapropylene glycol monoethyl ether, tetrapropylene glycol monopropyl ether, tetrapropylene glycol monoisopropyl ether, tetrapropylene glycol monon-butyl ether, tetrapropylene glycol monoisobutyl ether, tetrapropylene glycol monot-butyl ether, tetrapropylene glycol monon-hexyl ether, tetrapropylene glycol monophenyl ether, tetrapropylene glycol monobenzyl ether, tetrapropylene glycol mono(2-ethylhexyl) ether and other tetrapropylene glycol monoalkyl ethers, Tetrapropylene glycol monomethyl ether acetate, tetrapropylene glycol monoethyl ether acetate, tetrapropylene glycol monopropyl ether acetate, tetrapropylene glycol monobutyl ether acetate, tetrapropylene glycol monon-hexyl ether acetate, tetrapropylene glycol monophenyl ether acetate, tetrapropylene glycol monobenzyl ether acetate, tetrapropylene glycol mono(2-ethylhexyl) ether acetate and other tetrapropylene glycol monoalkyl ether acetates, Tetrapropylene glycol dimethyl ether, tetrapropylene glycol diethyl ether, tetrapropylene glycol dipropyl ether, tetrapropylene glycol dibutyl ether, tetrapropylene glycol dihexyl ether, tetrapropylene glycol diphenyl ether, tetrapropylene glycol dibenzyl ether, tetrapropylene glycol di(2-ethylhexyl) ether and other tetrapropylene glycol dialkyl ethers, Tetrapropylene glycol dimethyl ether acetate, tetrapropylene glycol diethyl ether acetate, tetrapropylene glycol dipropyl ether acetate, tetrapropylene glycol dibutyl ether acetate, tetrapropylene glycol dihexyl ether acetate, tetrapropylene glycol diphenyl ether acetate, tetrapropylene glycol dibenzyl ether acetate, tetrapropylene glycol di(2-ethylhexyl) ether acetate and other tetrapropylene glycol dialkyl ether acetates, and the like, and one or more of these can be used. In particular, in the present invention, it is preferable to use one or more selected from dipropylene glycol monoalkyl ether, dipropylene glycol monoalkyl ether acetate, tripropylene glycol monoalkyl ether, and tripropylene glycol monoalkyl ether acetate.

[0014] The synthetic resin emulsion can be obtained by polymerizing various monomers. Examples of the monomers include carboxyl group-containing monomers such as (meth)acrylic acid, crotonic acid, maleic acid, itaconic acid, fumaric acid, isocrotonic acid, salicylic acid, and cinnamic acid, Hydroxyl group-containing monomers such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 2-hydroxypentyl (meth)acrylate, 4-hydroxypentyl (meth)acrylate, 1-methyl-4-hydroxypentyl (meth)acrylate, 3-ethyl-3-hydroxyhexyl (meth)acrylate, 2-hydroxydecyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 1-methyl-4-hydroxybutyl (meth)acrylate, 5-hydroxypentyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 7-hydroxyheptyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 2-methyl-8-hydroxyoctyl (meth)acrylate, 7-methyl-8-hydroxyoctyl (meth)acrylate, 9-hydroxynonyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, Alkoxysilyl group-containing monomers such as 3-(meth)acryloxypropyltrimethoxysilane, 3-(meth)acryloxypropylmethyldimethoxysilane, 3-(meth)acryloxypropyltriethoxysilane, 3-(meth)acryloxypropylmethyldiethoxysilane, vinyltris(2-methoxyethoxy)silane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriisopropoxysilane, vinylmethyldimethoxysilane, (Meth)acrylamide, ethyl (meth)acrylamide, N-ethyl (meth)acrylamide, N-isopropyl (meth)acrylamide, N-n-propyl (meth)acrylamide, N-cyclopropyl (meth)acrylamide, N-(meth)acryloylpyrrolidine, N,N-dimethyl (meth)acrylamide, N,N-diethyl (meth)acrylamide, N-methyl-N-ethyl (meth)acrylamide, N-methyl-N-isopropyl (meth)acrylamide, N-methyl-N-n-propyl (meth)acrylamide, N-methylol (meth)acrylamide, N-[3-(dimethylamino)propyl] (meth)acrylamide, vinylamide, N,N-methylenebisacrylamide, diacetone (meth)acrylamide, N-methylol (meth)acrylamide, acrylamide glycolic acid, methyl acrylamide glycolate, dimethoxyhydroxyethyl acrylamide and other amide group-containing monomers, Alkyl group-containing monomers such as methyl (meth)acrylate, ethyl (meth)acrylate, isopropyl (meth)acrylate, n-propyl (meth)acrylate, i-butyl (meth)acrylate, n-butyl (meth)acrylate, sec-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-hexyl (meth)acrylate, octyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, myristyl (meth)acrylate, palmityl (meth)acrylate, trifluoroethyl (meth)acrylate, n-amyl (meth)acrylate, isoamyl (meth)acrylate, t-amyl (meth)acrylate, o-chtyl (meth)acrylate, decyl (meth)acrylate, dodecyl (meth)acrylate, dodecenyl (meth)acrylate, octadecyl (meth)acrylate, phenyl (meth)acrylate, isobornyl (meth)acrylate, benzyl (meth)acrylate, 2-phenylethyl (meth)acrylate, 2-methoxyethyl (meth)acrylate, 4-methoxybutyl (meth)acrylate, cyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate, methylcyclohexyl (meth)acrylate, t-butylcyclohexyl (meth)acrylate, hydroxymethylcyclohexyl (meth)acrylate, cyclooctyl (meth)acrylate, cyclodecyl (meth)acrylate, cyclododecyl (meth)acrylate, 4-tert-butylcyclohexyl (meth)acrylate, tripropylmethyl (meth)acrylate, triisopropylmethyl (meth)acrylate, tributylmethyl (meth)acrylate, triisobutylmethyl (meth)acrylate, trit-butylmethyl (meth)acrylate, 4-tert-butylcyclohexyl (meth)acrylate, (Methoxy) polyethylene glycol (meth)acrylate, (methoxy) polypropylene glycol (meth)acrylate, (methoxy) polyethylene glycol - polypropylene glycol (meth)acrylate, (methoxy) polyethylene glycol allyl ether, (methoxy) polypropylene glycol allyl ether, (methoxy) polyethylene glycol - polypropylene glycol allyl ether and other alkylene glycol chain-containing monomers, Butyl vinyl benzylamine, vinyl phenylamine, p-aminostyrene, N,N-dimethylaminoethyl (meth)acrylate, N,N-dimethylaminopropyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, N,N-dimethylaminopropyl (meth)acrylate, N,N-diethylaminopropyl (meth)acrylate, N-[2-(meth)acryloyloxyethyl]piperidine, N-[2-(meth)acryloyloxyethyl]pyrrolidine, N-[2-(meth)acryloyloxyethyl]morpholine, 4-[N,N-dimethylamino]styrene, 4-[N,N-diethylamino]styrene, 2-vinylpyridine, 4-vinylpyridine and other amino group-containing monomers, Glycidyl (meth)acrylate, diglycidyl fumarate, 3,4-epoxycyclohexyl (meth)acrylate, 3,4-epoxyvinylcyclohexane, allyl glycidyl ether, ε-caprolactone-modified glycidyl (meth)acrylate, β-methylglycidyl (meth)acrylate and other glycidyl group-containing monomers, Diacetone (meth)acrylate, diacetone (meth)acrylamide, acrolein, vinyl methyl ketone, vinyl ethyl ketone, vinyl (iso)butyl ketone, acetonyl acrylate, acryloxyalkyl propanal, methacryloxyalkyl propanal, 2-hydroxypropyl acrylate acetylacetate, thandiol acrylate acetylacetate, acetoacetoxyethyl (meth)acrylate, acetoacetoxyallyl ester and other carbonyl group-containing monomers, Acrylonitrile, methacrylonitrile and other nitrile group-containing monomers, Isocyanate group-containing monomers such as methacryloyl isocyanate, Oxazoline group-containing monomers such as vinyl oxazoline, 2-vinyl-2-oxazoline, 2-propenyl 2-oxazoline, etc., Hydrazino group-containing monomers such as propylene-1,3-dihydrazine and butylene-1,4-dihydrazine, Acetoacetoxyl group-containing monomers such as acetoacetoxyethyl (meth)acrylate and acetoacetoxy allyl ester, Methylol group-containing monomers such as N-methylol (meth)acrylamide, Vinylidene halide-based monomers such as vinylidene fluoride, Aromatic vinyl-based monomers such as styrene, 2-methylstyrene, chlorostyrene, vinyltoluene, t-butylstyrene, vinyl anisole, vinyl naphthalene, etc., Sulfonic acid-containing monomers such as styrene sulfonic acid and vinyl sulfonic acid, Benzophenone-based monomers such as 2-hydroxy-4-(meth)acryloxybenzophenone, 2-hydroxy-5-(meth)acryloxybenzophenone, 2-hydroxy-4-{ (meth)acryloxy-ethoxy}benzophenone, 2-hydroxy-4-{ (meth)acryloxy-diethoxy}benzophenone, 2-hydroxy-4-{ (meth)acryloxy-triethoxy}benzophenone, etc., Benzotriazole-based monomers such as 2-{2'-hydroxy-5'-(meth)acryloxyethylphenyl}-2H-benzotriazole, 2-{2'-hydroxy-5'-(meth)acryloxyethyl-3-t-butylphenyl}-2H-benzotriazole, 3-(meth)acryloyl-2-hydroxypropyl-3-{3'-(2''-benzotriazole)-4-hydroxy-5-t-butyl}phenylpropionate, etc., 4-(Meth)acryloyloxy-2,2,6,6-tetramethylpiperidine, 4-(meth)acryloylamino-2,2,6,6-tetramethylpiperidine, 4-(meth)acryloyloxy-1,2,2,6,6-pentamethylpiperidine, 4-(meth)acryloylamino-1,2,2,6,6-pentamethylpiperidine, 4-cyano-4-(meth)acryloylamino-2,2,6,6-tetramethylpiperidine, 1-(meth)acryloyl-4-(meth)acryloylamino-2,2,6,6-tetramethylpiperidine, 1-(meth)acryloyl-4-(meth)acryloylamino-2,2,6,6-tetramethylpiperidine, 4-crotonoyloxy-2,2,6,6-tetramethylpiperidine, 4-crotonoylamino-2,2,6,6-tetramethylpiperidine, 1-crotonoyl-4-crotonoyloxy-2,2,6,6-tetramethylpiperidine and other piperidine-based monomers, ethylene, propylene, isoprene, butadiene, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl pivalate, versatic acid vinyl ester, vinyl ether, vinyl ketone, and the like, and one or more of these can be used.

[0015] Among such monomers, monomers having ultraviolet absorption performance such as benzophenone-based monomers and benzotriazole-based monomers, and monomers having light stability performance such as piperidine-based monomers are effective in improving weather resistance and the like. However, when using such monomers, there were sometimes problems such as a decrease in clarity. In the present invention, even when a monomer having ultraviolet absorption performance and a monomer having light stability performance are used, a coating film that is free of unevenness and cloudiness and has excellent clarity can be obtained. Such monomers having ultraviolet absorption performance and monomers having light stability performance are not particularly limited, but it is preferable to contain them in an amount of 0.1% by weight or more and 10% by weight or less based on the total amount of the monomers. In such a case, a coating film that is excellent in weather resistance and durability, and is free of unevenness and cloudiness and has excellent clarity can be obtained.

[0016] The polymerization method of the synthetic resin emulsion is not particularly limited, and it can be polymerized by a known polymerization method using the above monomers and additives such as water, surfactant, initiator, solvent, dispersant, emulsion stabilizer, polymerization inhibitor, polymerization retarder, buffer, crosslinking agent, pH adjuster, chain transfer agent, catalyst, etc. The glass transition temperature of the obtained synthetic resin emulsion is not particularly limited, but it is preferably about 5°C or higher and 80°C or lower.

[0017] The surfactant is not particularly limited, and anionic surfactants, cationic surfactants, nonionic surfactants, zwitterionic surfactants, reactive surfactants, etc. can be used. Examples of the surfactant include anionic surfactants such as sodium dodecylbenzenesulfonate, sodium dodecyl sulfate and other alkylbenzenesulfonates, fatty acid salts, rosin acid salts, alkyl sulfates, alkyl sulfosuccinates, α-olefin sulfonates, alkyl naphthalenesulfonates, polyoxyethylene alkyl (aryl) sulfate ester salts, quaternary ammonium salts such as lauryl trialkylammonium salts, stearyl trialkylammonium salts, trialkylbenzylammonium salts, primary to tertiary amine salts, lauryl pyridinium salts, benzalkonium salts, benzetonium salts, or cationic surfactants such as laurylamine acetate, nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkylphenol ethers, polyoxyethylene alkyl esters, polyoxyethylene sorbitan alkyl esters, zwitterionic surfactants such as carboxy betaine type, sulfo betaine type, aminocarboxylic acid type, imidazoline derivative type, and the like, and one or more of these can be used.

[0018] As initiators, for example, persulfate initiators such as ammonium persulfate, potassium persulfate, and sodium persulfate; azo initiators such as 2,2'-azobisisobutyronitrile, 2,2'-azobis(2,4'-dimethylvaleronitrile), 2,2'-azobis(2-amidinopropane) dihydrochloride, and 2,2'-azobis(2-(2-imidazolin-2-yl)propane) dihydrochloride; dialkyl peroxides such as benzoyl peroxide, lauroyl peroxide, and decanoyl peroxide; peroxy esters such as t-butyl peroxybenzoate; hydroperoxides such as cumene hydroperoxide, paramethane hydroperoxide, and t-butyl hydroperoxide; redox initiators, photopolymerization initiators, reactive initiators, etc. can be used.

[0019] As the crosslinking agent, a crosslinking agent having various reactive functional groups may be appropriately selected and used from the functional groups contained in the synthetic resin emulsion. Examples of such combinations of functional groups include combinations such as a carboxyl group and a carbodiimide group, a carboxyl group and an epoxy group, a carboxyl group and an oxazoline group, a carboxyl group and an aziridine group, a hydroxyl group and an isocyanate group, a carbonyl group and a hydrazide group, an epoxy group and an amino group, and alkoxysilyl groups. For example, as crosslinking agents having an epoxy group, examples include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, glycerol polyglycidyl ether, diglycerol polyglycidyl ether, polyglycerol polyglycidyl ether, diglycerol polyglycidyl ether, polyhydroxyalkane polyglycidyl ether, sorbitol polyglycidyl ether, etc. Also, as crosslinking agents having an oxazoline group, examples include 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-vinyl-5-methyl-2-oxazoline, 2-isopropenyl-2-oxazoline, etc. Examples of the crosslinking agent having a hydrazide group include malonic dihydrazide, succinic dihydrazide, glutaric dihydrazide, adipic dihydrazide, sebacic dihydrazide, maleic dihydrazide, and the like.

[0020] The mixing ratio of the synthetic resin emulsion of the present invention, the ethylene glycol ether solvent, and the propylene glycol ether solvent is preferably 1 part by weight or more and 50 parts by weight or less (more preferably 5 parts by weight or more and 45 parts by weight or less, still more preferably 10 parts by weight or more and 40 parts by weight or less) in total amount of the ethylene glycol ether solvent and the propylene glycol ether solvent with respect to 100 parts by weight of the solid content of the synthetic resin emulsion. By having such a mixing ratio, a coating film with less unevenness, less cloudiness, and excellent clarity can be obtained. In addition, the timing of mixing the ethylene glycol ether solvent and the propylene glycol ether solvent into the synthetic resin emulsion is not particularly limited, such as after the polymerization of the synthetic resin emulsion or during the polymerization of the synthetic resin emulsion.

[0021] In addition to the above components, the aqueous coating material of the present invention can also be mixed with additives such as coloring pigments, extender pigments, aggregates, matting agents, pigment dispersants, anti-settling agents, fibers, crosslinking agents, plasticizers, preservatives, fungicides, defoaming agents, viscosity modifiers, leveling agents, anti-dripping agents, ultraviolet absorbers, light stabilizers, antioxidants, antibacterial agents, adsorbents, photocatalysts, etc., to the extent that the effects of the present invention are not impaired.

[0022] In the present invention, particularly, even when an ultraviolet absorber and / or a light stabilizer is included, a coating film with less unevenness, less cloudiness, and excellent clarity can be obtained. For example, when an ultraviolet absorber and / or a light stabilizer is included, the ultraviolet absorber and / or the light stabilizer can be mixed during the polymerization of the synthetic resin emulsion or during the production of the aqueous coating material. Also, the mixing ratio of the ultraviolet absorber and / or the light stabilizer is preferably 0.1 part by weight or more and 10 parts by weight or less with respect to 100 parts by weight of the solid content of the synthetic resin emulsion.

[0023] Examples of the ultraviolet absorber include benzophenone-based ultraviolet absorbers such as 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, 2-hydroxy-4-n-octyloxybenzophenone, 2-hydroxy-4-n-dodecyloxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, bis(5-benzoyl-4-hydroxy-2-methoxyphenyl)methane, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 4-dodecyloxy-2-hydroxybenzophenone, 2-hydroxy-4-methoxy-2'-carboxybenzophenone, 2-hydroxy-4-stearyloxybenzophenone, 2-(2'-Hydroxy-5'-methylphenyl)benzotriazole, 2-(2'-hydroxy-5'-tert-butylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole, 2-(2-hydroxy-5-tert-octylphenyl)benzotriazole, 2-(2-hydroxy-3,5-di-tert-octylphenyl)benzotriazole, 2-[2'-hydroxy-3',5'-bis(α,α'-dimethylbenzyl)phenyl]benzotriazole), condensate of methyl 3-[3-tert-butyl-5-(2H-benzotriazol-2-yl)-4-hydroxyphenyl]propionate and polyethylene glycol, isooctyl 3-[3-(2H-benzotriazol-2-yl)-5-tert-butyl-4-hydroxyphenyl]propionate, 2-(3-dodecyl-5-methyl-2-hydroxyphenyl)benzotriazole, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-tert-amylphenyl)benzotriazole, 2-(2'-hydroxy-4'-octoxyphenyl)benzotriazole, 2-[2'-hydroxy-3'-(3'',4'',5'',6''-tetrahydrophthalimidomethyl)-5'-methylphenyl]benzotriazole, 2,2-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazol-2-yl)phenol], 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol and other benzotriazole-based ultraviolet absorbers, etc. may be mentioned, and one or more of these can be used.

[0024] Examples of the light stabilizer include hindered amine light stabilizers such as di-sec-butylamine, diisopropylamine, 1,4-diazabicyclo[2.2.2]octane, 2,6,7-trimethyl-1,4-diazabicyclo[2.2.2]octane, bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate, bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate, 1-[2-{3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxy}ethyl]-4-{3-(3,5-di-t-butyl-hydroxyphenyl)propionyloxy}2,2,6,6'-tetramethylpiperidine, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, poly[{6-(1,1,3,3-tetramethylbutyl)amino-1,3,5-triazine-2,4-diyl}{(2,2,6,6-tetramethyl-4-piperidyl)imino}hexamethylene{(2,2,6,6-tetramethyl-4-piperidyl)imino}], etc. One or more of these can be used.

[0025] The aqueous coating material of the present invention can be mainly applied to the wall surface of the building exterior. The wall surface is one provided with a decorative film on a base material. By applying the aqueous coating material of the present invention to such a wall surface, the progress of wall surface deterioration can be suppressed, and the original aesthetic property of the wall surface can be maintained over a long period without impairing it.

[0026] Examples of the base material include concrete, mortar, siding board, extruded board, gypsum board, perlite board, plywood, brick, plastic board, metal board, glass, porcelain tile, etc. The surface of these base materials may be one subjected to some surface treatment (for example, sealer, surfacer, filler, putty, etc.).

[0027] As the decorative film, a coating material containing a binder and a coloring material as essential components may be used. Examples of the binder include acrylic resin, urethane resin, epoxy resin, vinyl acetate resin, vinyl chloride resin, silicone resin, fluororesin, acrylic vinyl acetate resin, acrylic urethane resin, acrylic silicone resin, acrylic styrene resin, alkyd resin, vinyl resin, polyamide resin, vinyl acetate-versatic acid vinyl ester resin, ABS resin, AS resin, cellulose resin, etc., and one or more of these can be used. As the synthetic resin, aqueous resins such as water-dispersible resins (resin emulsions) and water-soluble resins are preferred. Examples of the colorant include coloring pigments such as titanium oxide, zinc oxide, carbon black, graphite, black iron oxide, copper chromium black, cobalt black, copper manganese iron black, red iron oxide, molybdate orange, permanent red, permanent carmine, anthraquinone red, perylene red, quinacridone red, yellow iron oxide, titanium yellow, fast yellow, benzimidazolone yellow, chrome green, cobalt green, phthalocyanine green, ultramarine, dark blue, cobalt blue, phthalocyanine blue, quinacridone violet, dioxazine violet, etc., colored aggregates such as calcium carbonate, barium sulfate, clay, kaolin, pottery clay, talc, silica powder, diatomaceous earth, mica, mica, silica particles, glass particles, resin particles, metal particles, metal flakes, glass flakes, resin flakes, etc., or those obtained by coloring the surfaces of these with the above coloring pigments, dyes, etc. The color tone of the decorative film can be appropriately set by adjusting the type, mixing amount, etc. of such colorants.

[0028] In addition to the binder and colorant, additives such as aggregates, fibers, flame retardants, plasticizers, preservatives, fungicides, defoamers, viscosity modifiers, leveling agents, pigment dispersants, anti-settling agents, anti-dripping agents, matting agents, ultraviolet absorbers, light stabilizers, antioxidants, antibacterial agents, adsorbents, photocatalysts, etc. can also be mixed.

[0029] In addition to flat patterns, the decorative film also has patterns with unevenness. In the present invention, even for a patterned surface with unevenness, the surface of the wall is not dulled by the aqueous coating material film, the original aesthetic appearance of the wall is not impaired, and the original aesthetic appearance can be maintained over a long period of time. Examples of the pattern with unevenness include, for example, tile-like patterns, brick-like patterns, geometric patterns, stripe patterns, lattice patterns, polka dot patterns, sand wall patterns, yuzu skin patterns, wavy patterns, and other graphic patterns designed with animals, plants, etc. Such uneven patterns include those applied by a painting method, those applied by particles such as the above-mentioned colored aggregates, those applied by a formwork or a joint material, etc. The height difference between the concave part and the convex part may be constant or different at each part, but is preferably 20 mm or less, more preferably about 1 to 15 mm.

[0030] By applying the aqueous coating material of the present invention on the above-mentioned wall surface to form a coating film, the progress of deterioration of the wall surface can be suppressed, the original aesthetic appearance of the wall is not impaired, the original aesthetic appearance can be maintained over a long period of time, and it can be suitably used as an aqueous clear coating material. As the coating method of the aqueous coating material of the present invention, brush painting, trowel painting, roller coating, spray coating, electrostatic coating, roll coater, curtain flow coater, dipping coating, electrocoating, etc. can be used. The coating amount is not particularly limited, but is preferably about 20 g / m2 or more and 300 g / m2 or less (more preferably 30 g / m2 or more and 250 g / m2 or less).

Examples

[0031] Examples are shown below to clarify the features of the present invention. The present invention is not limited to the examples here.

[0032] Using the raw materials shown in Table 1 and in the formulation shown in Table 2, they were mixed by a conventional method to obtain an aqueous coating material. The following tests were conducted on the obtained aqueous coating material.

[0033] (Transparency Test 1) The obtained aqueous coating material was applied onto a black acrylic plate at an application rate of 150 g / m2, and dried at a temperature of 23°C and a relative humidity of 50% for 24 hours to obtain a test piece. The transparency of the obtained test piece was evaluated visually. The evaluation criteria are as follows. The results are shown in Table 2. ◎: It had excellent transparency 〇: It had good transparency △: Slight cloudiness was observed ×: Slight cloudiness and unevenness were observed

[0034] (Transparency Test 2) A test piece was prepared in the same manner as in Transparency Test 1 except that the application rate was changed to 300 g / m2, and the same evaluation as in Transparency Test 1 was conducted. The results are shown in Table 2.

[0035]

Table 1

[0036]

Table 2

Claims

**Claim 1**: An aqueous coating material using a synthetic resin emulsion obtained by polymerizing a monomer having ultraviolet absorption performance and / or light stability performance as a binder, wherein the aqueous coating material further contains an ethylene glycol ether solvent and a propylene glycol ether solvent in a mixing ratio of 0.1:99.9 to 49.9:50.

1. **Claim 2**: The aqueous coating material according to Claim 1, wherein the monomer having ultraviolet absorption performance and / or light stability performance is one or more selected from benzophenone-based monomers, benzotriazole-based monomers, and piperidine-based monomers. **Claim 3**: An aqueous coating material using a synthetic resin emulsion as a binder and containing an ultraviolet absorber and / or a light stabilizer, wherein the aqueous coating material further contains an ethylene glycol ether solvent and a propylene glycol ether solvent in a mixing ratio of 0.1:99.9 to 49.9:50.

1. **Claim 4** The total amount of the ethylene glycol ether solvent and the propylene glycol ether solvent is 1 part by weight or more and 50 parts by weight or less with respect to 100 parts by weight of the solid content of the synthetic resin emulsion, and the aqueous coating material according to any one of Claims 1 to 3 is characterized by this.

Images