Renovation Method

Abstract

To provide a repair method by which a decorative coated film surface having an aesthetic property of a natural stone tone while being lightweight can be finished up.SOLUTION: In a repair method, a decorative coating material is applied to an existing coating film, wherein the decorative coating material is obtained by scattering coloring gel particles containing a synthetic resin emulsion, a gel formation substance, a coloring pigment, and lightweight granules with an average particle diameter 50 μm or larger.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a repair method that can be applied to the interior and exterior wall surfaces of buildings. [Background technology]

[0002] As more and more sophisticated buildings and civil engineering structures are being designed, their walls are being coated with natural stone-like decorative coatings that express the beauty of natural stone, rock, sand, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-078288 [Patent Document 2] Japanese Patent Application Publication No. 2019-038905 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, in addition to properties that have been coated with such decorative coatings, there are many properties that are approaching the time to repaint the decorative coatings, and various painting and repainting methods are being investigated. For example, as in Patent Document 1, when repainting an existing decorative coating with a similar decorative coating, the coating tends to become very heavy because a decorative coating containing powder and granular materials such as natural stone, rock, and sand is layered on top of it. On the other hand, when a multicolored paint containing colored aggregate is used as in Patent Document 2, the transparency of the base is easily noticeable, and there is room for improvement in terms of imparting a natural stone-like aesthetic appearance. [Means for solving the problem]

[0005] The inventors of the present invention conducted extensive research to solve these problems and discovered that by applying a decorative coating material containing dispersed colored gel particles, including a synthetic resin emulsion, a gel-forming substance, a color pigment, and lightweight powder particles with an average particle size of 50 μm or more, to an existing coating film, it is possible to improve the surface of the decorative coating film to have a lightweight yet beautiful natural stone-like appearance, which led to the completion of the present invention.

[0006] That is, the present invention has the following features. 1. A repair method for an existing coating film in which a decorative coating material is applied on top of the existing coating film. The decorative coating material is a decorative coating material in which colored gel particles are dispersed in a medium, The colored gel particles contain a synthetic resin emulsion, a gel-forming substance, a color pigment, and a lightweight powder having an average particle diameter of 50 μm or more. fruit , The lightweight powder has a unit volume mass of 0.1 kg / L or more and 0.8 kg / L or less, The content of the color pigment and the content of the lightweight powder satisfy the following formula (3): A renovation method characterized by: (3) 60 ≧ Lightweight powder content / Color pigment content ≧ 2 2. The repair method described in 1., characterized in that the existing coating film is a natural stone-like coating film containing powder and granular materials. 3. A repair method according to 1., characterized in that the average particle diameter of the lightweight powder is 50 μm or more and 1000 μm or less. 4. The repair method described in 1., wherein the average particle diameter of the coloring pigment is 10 nm or more and 800 nm or less. [Effects of the Invention]

[0007] The repair method of the present invention can repair a surface with a decorative coating film that is lightweight yet has the aesthetic appearance of natural stone. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment of the present invention will be described.

[0009] The present invention relates to a repair method in which a decorative coating material is applied on top of an existing coating film. By repairing using a decorative coating material in which synthetic resin emulsion, gel-forming substances, color pigments, and colored gel particles containing lightweight powder particles are dispersed in a medium, it is possible to create a decorative coating film surface that is lightweight yet has the aesthetic appearance of natural stone.

[0010] The decorative coating material of the present invention is lighter than conventional natural stone-like coatings and can maintain the aesthetic appearance of natural stone while remaining lightweight. This provides advantages in transportation, application process, and prevention of shedding after application. Furthermore, by combining a coloring pigment with a lightweight powder, a natural stone-like aesthetic can be achieved with a small application amount, making it possible to thin the decorative coating film, further reducing the weight while still maintaining the aesthetic appearance of natural stone. Furthermore, not only is the decorative coating material itself lighter, but the total weight of the coating film, including the decorative coating material and the existing coating, can be reduced, providing benefits such as greater prevention of shedding. If the existing coating film has an uneven pattern, a finished appearance that makes use of that uneven pattern can also be achieved.

[0011] The existing coating film applicable to the present invention is not particularly limited, but examples thereof include coating films made of architectural finish coating materials specified in JIS A 6909, or multicolored pattern paints, stone-like finish coating materials, sandstone-like finish coating materials, etc. Such existing coating films may have a clear coating film or the like on the outermost surface. In the present invention, the above-mentioned effects can be particularly exhibited for coating films containing particulate matter, such as natural stone-like coating films containing particulate matter. In the present invention, the existing coating film refers to a coating film that has been applied for more than six months, or even more than one year.

[0012] For example, if a natural stone-like coating containing powder particles is applied on top of the existing coating, the weight of the decorative coating material will be added to the existing coating, increasing the total weight of the coating and its load. Therefore, it is desirable to remove the existing coating first and then apply the decorative coating material, but this will result in a longer construction period. In contrast, in the present invention, the load due to the weight of the coating film can be reduced, so there is no need to remove the existing coating film, and it is possible to paint over the existing coating film.

[0013] Examples of powders and granules include heavy calcium carbonate, kansuiite, light calcium carbonate, white carbon, talc, mica, kaolin, clay, china clay, diatomaceous earth, barite powder, barium sulfate, precipitated barium sulfate, silica sand, silica stone powder, quartz powder, resin beads, crushed resin, glass beads, crushed glass, crushed ceramics, crushed ceramics, marble, granite, serpentine, granite, fluorite, kansuiite, feldspar, silica stone, silica sand, and crushed products thereof, and any combination of these may be used. Furthermore, the surface of the powder or granule may be colored and coated.

[0014] The decorative coating material of the present invention is characterized in that colored gel particles are dispersed in a medium, and the colored gel particles contain a synthetic resin emulsion, a gel-forming substance, a color pigment, and lightweight powder particles with an average particle diameter of 50 μm or more.

[0015] [Colored gel particles] The colored gel particles of the present invention are characterized by comprising a synthetic resin emulsion, a gel-forming substance, a color pigment, and lightweight powder particles having an average particle size of 50 μm or more.

[0016] (Synthetic resin emulsion) The synthetic resin emulsion is not particularly limited, but for example, one obtained by emulsion polymerization of a group of monomers containing alkyl (meth)acrylate monomers as the main component can be used. Examples of the (meth)acrylic acid alkyl ester monomer include: 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, oxatyl (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, tri-t-butylmethyl (meth)acrylate, 4-tert-butylcyclohexyl (meth)acrylate, and the like. Other 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; 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, hydroxyl group-containing monomers such as 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, and 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, and vinylmethyldimethoxysilane; amide group-containing monomers such as (meth)acrylamide, ethyl (meth)acrylamide, N-ethyl (meth)acrylamide, N-isopropyl (meth)acrylamide, Nn-propyl (meth)acrylamide, N-cyclopropyl (meth)acrylamide, N-(meth)acroylpyrrolidine, N,N-dimethyl (meth)acrylamide, N,N-diethyl (meth)acrylamide, N-methyl-N-ethyl (meth)acrylamide, N-methyl-N-isopropyl (meth)acrylamide, N-methyl-Nn-propyl (meth)acrylamide, N-methylol (meth)acrylamide, N-[3-(dimethylamino)propyl] (meth)acrylamide, vinylamide, N,N-methylenebisacrylamide, diacetone (meth)acrylamide, N-methylol (meth)acrylamide, acrylamidoglycolic acid, methyl acrylamidoglycolate, and dimethoxyhydroxyethyl acrylamide; Alkylene glycol chain-containing monomers such as (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, and (methoxy)polyethylene glycol-polypropylene glycol allyl ether; amino group-containing monomers such as butylvinylbenzylamine, vinylphenylamine, 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, and 4-vinylpyridine; glycidyl group-containing monomers such as glycidyl (meth)acrylate, diglycidyl fumarate, 3,4-epoxycyclohexyl (meth)acrylate, 3,4-epoxyvinylcyclohexane, allyl glycidyl ether, ε-caprolactone-modified glycidyl (meth)acrylate, and β-methylglycidyl (meth)acrylate; carbonyl group-containing monomers such as diacetone (meth)acrylate, diacetone (meth)acrylamide, acrolein, vinyl methyl ketone, vinyl ethyl ketone, vinyl (iso)butyl ketone, acetonyl acrylate, acryloxyalkyl propanals, methacryloxyalkyl propanals, 2-hydroxypropyl acrylate acetyl acetate, tandiol acrylate acetyl acetate, acetoacetoxyethyl (meth)acrylate, and acetoacetoxyallyl ester; nitrile group-containing monomers such as (meth)acrylonitrile; isocyanate group-containing monomers such as methacryloyl isocyanate; oxazoline group-containing monomers such as vinyloxazoline, 2-vinyl-2-oxazoline, and 2-propenyl-2-oxazoline; 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 acetoacetoxyallyl ester; Methylol group-containing monomers such as N-methylol (meth)acrylamide, vinylidene halide monomers such as vinylidene fluoride; Aromatic vinyl monomers such as styrene, 2-methylstyrene, chlorostyrene, vinyltoluene, t-butylstyrene, vinylanisole, and vinylnaphthalene; 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, and 2-hydroxy-4-{(meth)acryloxy-triethoxy}benzophenone; benzotriazole-based monomers such as 2-{2'-hydroxy-5'-(meth)acryloxyethylphenyl}-2H-benzotriazole, 2-{2'-hydroxy-5'-(meth)acryloxyethyl-3-t-butylphenyl}-2H-benzotriazole, and 3-(meth)acryloyl-2-hydroxypropyl-3-{3'-(2''-benzotriazole)-4-hydroxy-5-t-butyl}phenylpropionate; 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 - piperidine-based monomers such as 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, and 1-crotonoyl-4-crotonoyloxy-2,2,6,6-tetramethylpiperidine; Ethylene, propylene, isoprene, butadiene, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl pivalate, vinyl versatate, vinyl ether, vinyl ketone, One or more of these can be used. In the present invention, acrylic and methacrylic are collectively referred to as (meth)acrylic. Furthermore, a monomer is a general term for a compound having a polymerizable unsaturated double bond.

[0017] Any known polymerization method may be employed, and in addition to ordinary emulsion polymerization, soap-free emulsion polymerization, feed emulsion polymerization, seed emulsion polymerization, etc. may also be employed. During polymerization, emulsifiers, initiators, polymerization inhibitors, polymerization retarders, buffers, chain transfer agents, crosslinking agents, coupling agents, catalysts, etc. may also be used. Among these, emulsifiers include anionic emulsifiers, cationic emulsifiers, nonionic emulsifiers, amphoteric emulsifiers, etc., and can be appropriately selected from non-reactive and reactive emulsifiers. Among these, nonionic emulsifiers, particularly nonionic reactive emulsifiers, are preferred in terms of stability over time, water resistance, weather resistance, etc.

[0018] The glass transition temperature of the synthetic resin emulsion can be adjusted by selecting the types of the monomers, the mixing ratio, etc. This glass transition temperature may be set appropriately taking into consideration the final use, etc., and is preferably about -20 to 80°C, more preferably about -10 to 60°C. The glass transition temperature can be calculated using Fox's formula. Furthermore, the synthetic resin emulsion that can be suitably used has a solid content of 10% by weight or more and 60% by weight or less, and more preferably 30% by weight or more and 55% by weight or less.

[0019] (gel-forming substance) The gel-forming substance is a component that contributes to the gelation of the colored gel particles. As the gel-forming substance, for example, substances known in multicolor pattern paints can be used. Specific examples include polyvinyl alcohol, poly(meth)acrylic acid, polyethylene oxide, water-soluble urethane, biogum or its derivatives, galactomannan or its derivatives, alginic acid or its derivatives, cellulose derivatives, gelatin, casein, albumin, etc., or chemically modified versions of these substances by oxidation, methylation, carboxymethylation, hydroxyethylation, hydroxypropylation, sulfation, phosphorylation, cationization, etc., and one or more of these can be used. The mixing ratio of the gel-forming substance is preferably 0.01 to 30 parts by weight, more preferably 0.05 to 20 parts by weight, per 100 parts by weight of the synthetic resin emulsion.

[0020] (color pigments) Examples of color pigments include titanium oxide, zinc oxide, carbon black, lamp black, bone 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 blue, Prussian blue, cobalt blue, phthalocyanine blue, quinacridone violet, dioxazine violet, aluminum pigments, and pearl pigments, and these can be used alone or in combination of two or more. The average particle size of the color pigment is not particularly limited, but is preferably 1 μm or less (more preferably 10 nm or more and 800 nm or less). The average particle size of the color pigment is a value measured using a laser diffraction particle size distribution measuring device.

[0021] (lightweight powder) The lightweight granular material can have an average particle size of 50 μm or more (preferably 50 μm to 1000 μm, more preferably 60 μm to 500 μm, and even more preferably 70 μm to 300 μm). By incorporating such lightweight granular material into the colored gel particles, it is possible to form a light, thin coating film with excellent aesthetics. In addition, the coating film surface can be given a textured appearance. If the average particle size is too small, the aesthetic appearance of natural stone, sand wall, etc. cannot be obtained, and the textured appearance cannot be obtained. Examples of the lightweight powder include shirasu balloons, glass balloons, perlite, and pumice, and one or more of these can be used. The unit volume mass of the lightweight powder or granule is preferably 0.1 kg / L or more and 0.8 kg / L or less (more preferably 0.2 kg / L or more and 0.6 kg / L or less). The average particle size of lightweight granular materials is a value obtained by sieving them using a metal mesh sieve specified in JIS Z8801-1:2000 and calculating the average value of the weight distribution. The unit volume mass of lightweight granular materials can be measured in accordance with JIS A1104:2019.

[0022] In the present invention, it is preferable that the content of the color pigment and the content of the lightweight powder / granule satisfy the following formula (1). (1) The content of light powders is equal to or greater than the content of color pigments. By satisfying formula (1), the natural stone-like aesthetic and textured appearance can be further enhanced, and a light, thin coating film can be formed. Note that the lightweight powder content and color pigment content shown here refer to the lightweight powder content in the color gel particles and the color pigment content in the color gel particles. Furthermore, in the present invention, it is preferable to satisfy the following formula (2), and more preferably formula (3). (2) 60 ≧ Lightweight powder content / Color pigment content ≧ 1 (3) 60 ≧ Lightweight powder content / Color pigment content ≧ 2 By satisfying formulas (2) and (3), the natural stone-like aesthetic appearance and textured appearance are improved, and a light, thin coating film can be formed.

[0023] The amount of the color pigment to be mixed is, for example, preferably 0.05 to 20 parts by weight, more preferably 0.1 to 15 parts by weight, even more preferably 0.3 to 12 parts by weight, and most preferably 0.5 to 10 parts by weight, per 100 parts by weight of the synthetic resin emulsion. The amount of the lightweight powder or granules to be mixed is, for example, preferably 1 part by weight or more and 500 parts by weight or less, more preferably 2 parts by weight or more and 300 parts by weight or less, and even more preferably 3 parts by weight or more and 100 parts by weight or less, per 100 parts by weight of the synthetic resin emulsion. The amounts of color pigment and lightweight powder shown here refer to the amounts of color pigment and lightweight powder in the colored gel particles relative to 100 parts by weight of the synthetic resin emulsion in the colored gel particles.

[0024] (Other ingredients) In addition to the above-mentioned components, the colored gel particles may also contain commonly used additives, such as powders, thickeners, dispersants, dyes, fibers, leveling agents, wetting agents, plasticizers, film-forming aids, antifreeze agents, pH adjusters, preservatives, antifungal agents, anti-algae agents, antibacterial agents, antifoaming agents, fragrances, light stabilizers, UV absorbers, photocatalysts, crosslinking agents, flame retardants, solvents, and water, which may be added to the extent that the effects of the present invention are not impaired.

[0025] In the present invention, the colored gel particles may contain a powder different from the lightweight powder. Examples of powders and granules include heavy calcium carbonate, kansui stone, light calcium carbonate, white carbon, talc, mica, kaolin, clay, china clay, diatomaceous earth, barite powder, barium sulfate, precipitated barium sulfate, silica sand, silica stone powder, quartz powder, resin beads, and glass beads, and one or more of these can be used. Such powder particles can impart a natural stone-like aesthetic appearance and also prevent the colored gel particles from becoming too light due to the lightweight powder particles, thereby preventing the colored gel particles from floating during storage or after application. In particular, in the present invention, the unit volume mass of the powder or granule is preferably more than 0.8 kg / L and not more than 4.0 kg / L (even more preferably 1.0 kg / L or more and not more than 3.5 kg / L). The average particle size of the powder or granule is not particularly limited, but is preferably 200 μm or less (more preferably 1 μm or more and 150 μm or less, and even more preferably 2 μm or more and less than 120 μm). The average particle size of the powder or granule is a value measured using a laser diffraction particle size distribution measuring device. When such powder or granules are contained in the colored gel particles, the amount of the powder or granules mixed is not particularly limited, but is, for example, preferably 0.1 to 300 parts by weight, more preferably 1 to 200 parts by weight, per 100 parts by weight of the synthetic resin emulsion. The mixing ratio (weight ratio) of the lightweight powder and the powder is preferably 100:10 to 100:400, more preferably 100:20 to 100:200.

[0026] Examples of thickeners include clay mineral thickeners such as bentonite, montmorillonite, hectorite, beidellite, saponite, nontronite, volconescoite, sauconite, stevensite, fluorohectorite, laponite, rectorite, vermiculite, illite, makatite, kanemite, illielite, magadiite, kenyaite, sepiolite, and palygorskite, cellulose thickeners, polyacrylic acid thickeners, swellable silica thickeners, and urethane thickeners, and one or more of these may be used.

[0027] [Medium] The medium disperses the colored gel particles. The medium is not particularly limited, but is preferably an aqueous medium containing water, and may be a mixture of water and an aqueous solvent. The aqueous solvent may be a mixture of, for example, alcohols such as methanol, ethanol, propanol, butanol, and 2-ethyl-1-hexanol, glycols such as ethylene glycol and propylene glycol, ethers such as ethylene glycol mono-2-ethylhexyl ether, diethylene glycol mono-2-ethylhexyl ether, and diethylene glycol dibutyl ether, and esters such as 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate and 2,2,4-trimethyl-1,3-pentanediol diisobutyrate.

[0028] Furthermore, the medium may contain commonly used additives such as gelling agents, powders, dyes, dispersants, fibers, thickeners, leveling agents, wetting agents, plasticizers, film-forming aids, antifreeze agents, pH adjusters, preservatives, antifungal agents, anti-algae agents, antibacterial agents, antifoaming agents, fragrances, light stabilizers, ultraviolet absorbers, photocatalysts, crosslinking agents, flame retardants, solvents, etc., within the range that does not impair the effects of the present invention. The medium may also contain the above-mentioned synthetic resin emulsion. When a synthetic resin emulsion is contained, the solid content of the synthetic resin emulsion is preferably 10 to 100 parts by weight, more preferably 30 to 80 parts by weight, per 100 parts by weight of the medium. Note that water, aqueous solvents, etc. present in the synthetic resin emulsion are calculated as part of the medium.

[0029] (gelling agent) In the present invention, it is preferable that the medium contains a gelling agent. The gelling agent, together with the gel-forming substance described above, is a component that contributes to the gelation of the colored gel particles. Examples of gelling agents include sulfates, acetates, organic acid salts, silicates, borates, nitrates, chlorides, hydroxides, etc. of metals such as magnesium, calcium, barium, aluminum, lithium, sodium, potassium, zinc, iron, zirconium, chromium, tin, silver, copper, etc.; inorganic salts such as hydrochloric acid, sulfuric acid, nitric acid, boric acid, etc., or salts thereof; organic acids such as citric acid, lactic acid, tannic acid, etc., or salts thereof; clays, etc.; and one or more of these may be used. The ratio of the gelling agent in the medium is preferably 0.01 to 5.0% by weight, more preferably 0.03 to 3.0% by weight, and even more preferably 0.05 to 2.0% by weight. When the medium contains a synthetic resin emulsion, the water and aqueous solvent in the synthetic resin emulsion are calculated as part of the medium.

[0030] (powder) In the present invention, it is preferable that the medium contains powder or granular material. The powder particles in the medium are not particularly limited as long as they have an average particle size of 200 μm or less (more preferably 1 μm or more and 150 μm or less, and even more preferably 2 μm or more and less than 120 μm). By including such powder particles in the medium, the design of the colored gel particles can be made more prominent, and the colored gel particles are prevented from collapsing when mixed or stirred, and also when painted, and painting workability can be improved. The average particle size of the powder or granule is a value measured using a laser diffraction particle size distribution measuring device. Examples of powder particles in the medium include heavy calcium carbonate, kansui stone, light calcium carbonate, white carbon, talc, mica, kaolin, clay, china clay, diatomaceous earth, barite powder, barium sulfate, precipitated barium sulfate, silica sand, silica stone powder, quartz powder, resin beads, glass beads, hollow balloons, etc., and one or more of these can be used. Furthermore, the light powder or granule, the color pigment, or powder or granule having an average particle size of more than 200 μm (preferably 250 μm or more to 5 mm or less) may be contained to the extent that the effect of the present invention is not impaired. The ratio of the powder particles in the medium is preferably 0.1 to 25% by weight, more preferably 0.3 to 20% by weight, and even more preferably 0.5 to 15% by weight. When the medium contains lightweight powder, the ratio of the lightweight powder in the medium is preferably 0.01 to 20% by weight, more preferably 0.05 to 15% by weight, and even more preferably 0.1 to 10% by weight. When the medium contains a color pigment, the ratio of the color pigment in the medium is preferably 0.01 to 10% by weight, more preferably 0.05 to 8% by weight, and even more preferably 0.1 to 5% by weight.

[0031] [Decorative coating materials] The decorative coating material of the present invention can be produced by adding a mixture containing the components that form colored gel particles, namely, a synthetic resin emulsion, a gel-forming substance, a color pigment, and lightweight powder particles with an average particle size of 50 μm or more, to a medium and gelling the mixture. For the formation of colored gel particles, a method known for multicolor paints can be used, for example. The mixing ratio (weight ratio) of the components forming the colored gel particles to the medium is preferably 100:50 to 100:200, and more preferably 100:70 to 100:150.

[0032] The shape of the colored gel particles is not particularly limited, and various shapes such as spherical, flat, thread-like, etc. The average particle size of the colored gel particles is preferably about 0.01 to 10 mm, more preferably about 0.1 to 5 mm. The desired shape and particle size of the colored gel particles can be obtained by appropriately setting and adjusting the shape of the stirring blade, the size and position of the stirring blade relative to the stirring vessel, the rotation speed of the stirring blade, and the concentration or viscosity of each component.

[0033] The colored gel particles may be of one type only, or may contain two or more types. For example, when two types of colored gel particles are contained, the composition can be produced by a method in which a component that forms the first colored gel particles is added to a medium to cause gelation, and then a component that forms the second colored gel particles is added to cause gelation; a method in which the components that form the first and second colored gel particles are simultaneously added to a medium to cause gelation; or a method in which decorative coating materials in which colored gel particles are dispersed in a medium are each produced and then the respective decorative coating materials are mixed together. Furthermore, in the present invention, when two or more types of colored gel particles are contained, it is sufficient that at least one of them contains lightweight powder particles having an average particle diameter of 50 μm or more, and it is preferable that at least two types contain lightweight powder particles having an average particle diameter of 50 μm or more. Furthermore, in the present invention, it is preferable that one or more types of colored gel particles satisfy the above formula (1) (preferably also satisfy formula (2), more preferably also satisfy formula (3)), and it is even more preferable that two or more types, or even all of the colored gel particles, satisfy the above formula (1) (preferably also satisfy formula (2), more preferably also satisfy formula (3)).

[0034] [Renovation method using decorative coating materials] The repair method of the present invention can be applied to various applications, such as architecture, building materials, civil engineering, woodworking, plastic products, metal products, and non-ferrous metal products. Specifically, the method can be used to paint and repair existing coating surfaces on various substrates, such as concrete, mortar, siding boards, extruded boards, gypsum boards, perlite boards, plywood, plastic boards, metal boards, glass, and porcelain tiles. In addition, before repair, a primer (sealer, surfacer) or the like can be applied to the existing coating surface.

[0035] When applying the coating, various coating tools such as a spray, roller, brush, etc. can be used. The amount of water to be added may be appropriately determined taking into consideration the type of coating equipment, the condition of the substrate, the temperature during coating, etc. The amount of the decorative coating material of the present invention to be applied is preferably 0.2 to 5.0 kg / m 2 , more preferably 0.3 to 4.0 kg / m 2, and more preferably 0.4 to 3.0 kg / m 2 , and particularly preferably 0.5 to 2.0 kg / m 2 is. The coating amount in terms of solid content is preferably 0.1 to 3.0 kg / m 2 , more preferably 0.15 to 2.0 kg / m 2 , and more preferably 0.2 to 1.0 kg / m 2 , and particularly preferably 0.25 to 0.8 kg / m 2 is. Furthermore, drying after application of the decorative coating material of the present invention is preferably carried out at room temperature, but heating is also possible. The drying time is preferably 1 to 5 hours at room temperature. The decorative coating material of the present invention can be suitably used to form a top surface finish coating film, and if necessary, a clear coat or the like can be applied after the decorative coating material of the present invention has been applied. [Example]

[0036] The following examples will be given to clarify the features of the present invention, but the present invention is not limited to these examples.

[0037] Example 1

[0038] A medium was produced by mixing the raw materials shown in Table 1 with the formulation shown in Table 2, and a mixture of components for forming colored gel particles was added to the medium, mixed and stirred, to produce colored gel particle dispersion 1. Next, colored gel particle dispersion 2 was prepared in the same manner. Furthermore, the colored gel particle dispersion 1 and the colored gel particle dispersion 2 were mixed in a weight ratio of 50:50 to obtain a decorative coating material 1. The resulting decorative coating material 1 was subjected to the following tests.

[0039] (Paintability (lightweight) test) The obtained decorative coating material 1 was applied to a wall surface (900 mm x 1800 mm) with an existing coating film (a natural stone-like coating film (thickness 3 mm) mainly composed of colored aggregate and resin, approximately 15 years old) at a rate of approximately 1.3 kg / m using a roller.2 (Solid content equivalent: 0.4 kg / m 2 ) to obtain test specimens. The resulting painted surface was visually inspected and evaluated for paintability as follows: The evaluation results are shown in Table 3. 4: No sagging due to its own weight was observed 3: There was almost no sagging due to its own weight. 2: Some sagging occurred due to its own weight. 1: Dripping due to its own weight was noticeable

[0040] (Aesthetics test) The test specimens obtained in the paintability test were left to stand at room temperature (23°C, 50% relative humidity) for 24 hours, after which the coating surface was visually observed and evaluated. The evaluation results are shown in Table 3. (Natural stone feel) 4: A coating film with a natural stone-like appearance was obtained 3: A coating film with a natural stone-like appearance was obtained 2: The design lacks a natural stone look. 1: It lacked the natural stone look. (Uneven feeling) 4: A coating film with excellent texture was obtained 3: A coating film with a rough texture was obtained 2: The design is somewhat lacking in texture. 1: It lacked texture

[0041] (Examples 2 to 17, Comparative Example 1) Using the raw materials shown in Table 1 and the compositions shown in Tables 2 and 3, decorative coating materials were obtained in the same manner as in Example 1. The resulting decorative coating material was subjected to the same tests as in Example 1. The evaluation results are shown in Table 3.

[0042] [Table 1]

[0043] [Table 2]

[0044] Table 3

Claims

1. A repair method for an existing coating film in which a decorative coating material is applied on top of the existing coating film, The decorative coating material is a decorative coating material in which colored gel particles are dispersed in a medium, The colored gel particles contain a synthetic resin emulsion, a gel-forming substance, a color pigment, and a lightweight powder or granule having an average particle diameter of 50 μm or more, The lightweight powder has a unit volume mass of 0.1 kg / L or more and 0.8 kg / L or less, A repair method characterized in that the content of the color pigment and the content of the lightweight powder and granules satisfy the following formula (3). (3) 60 ≧ Content of lightweight powder / content of coloring pigment ≧ 2

2. 2. The repair method according to claim 1, wherein the existing coating film is a natural stone-like coating film containing powder particles.

3. A renovation method as described in claim 1, characterized in that the average particle diameter of the lightweight powder is 50 μm or more and 1000 μm or less.

4. The repair method described in claim 1, characterized in that the average particle diameter of the coloring pigment is 10 nm or more and 800 nm or less.

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