Coating formation method

Abstract

To provide a method for easily forming a coated surface having such natural texture in which different color tones are mixed and having high beauty appearance.SOLUTION: A film formation method includes a step (1) of coating at least two aqueous coating materials to a coated surface, and forming a coating surface, a step (2) of supplying water and / or a hydrophilic solvent to the coating surface, and uniformizing the coating surface using a pressing tool, and a step (3) of drying the coating surface, in which the aqueous coating materials each contains an aggregate, an extender pigment, an aqueous resin, and a hydrophobic solvent, and at least the one aqueous coating material further contains a coloring pigment.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a method for forming a coating surface that can be applied to the surface decoration of interior and exterior walls of buildings, civil engineering structures, etc. [Background technology]

[0002] Conventionally, coatings having various patterns have been formed on the wall surfaces of buildings, civil engineering structures, etc. One example of such a coating is one in which a pattern in which different color tones are mixed is formed using a plurality of topcoat materials.

[0003] Patent Document 1 discloses a method of forming a patterned coating by sequentially applying two or more colored emulsion paints with different color tones and then pressing the coating while it is in a fluid state. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-263565 Summary of the Invention [Problem to be solved by the invention]

[0005] However, Patent Document 1 uses a colored emulsion paint whose main components are a resin emulsion and a colored pigment. Therefore, the color of the formed coating is based on the color development of a paint, and there is room for improvement in terms of texture. Furthermore, with the method of Patent Document 1, when two or more colors of colored emulsion paints are in a fluid state, they tend to mix with each other, which may result in the formed coating becoming monochromatic. Furthermore, with the method of Patent Document 1, when the coating is pressed, stringiness or the like may occur in the coating, which may impair its aesthetic appearance.

[0006] The present invention has been made in consideration of such problems, and aims to provide a method by which a highly aesthetic coating surface having a natural texture with a mixture of different color tones can be easily formed. [Means for solving the problem]

[0007] As a result of intensive research to solve the above problems, the inventors came up with a coating formation method that involves applying at least two specific topcoat materials to form a coating surface, supplying water and / or a hydrophilic solvent to the coating surface, and smoothing the coating surface using a pressing tool, and have completed the present invention.

[0008] That is, the present invention has the following features. 1. A coating forming method for forming a coating surface having a mixture of different color tones, For the coated surface, (1) A process of applying at least two types of water-based topcoats to form a coating surface; (2) A step of supplying water and / or a hydrophilic solvent to the coating surface and leveling the coating surface using a pressing tool; (3) A step of drying the coated surface; This is what we do. The above water-based topcoat materials are, The composition contains 70 to 500 parts by weight of an extender pigment, 3 to 30 parts by weight of an aqueous resin, and 0.1 to 50 parts by weight of a hydrophobic solvent relative to 100 parts by weight of an aggregate, At least one of the above water-based topcoats further contains a coloring pigment. 1~100 parts by weight A coating forming method comprising the steps of: 2 In the above step (1), a coating surface is formed using a trowel. 1 . A coating formation method as described above. 3 1. In the above step (2), the coating surface is leveled using a trowel. Or 2. The coating forming method according to claim 1. [Effects of the Invention]

[0009] According to the present invention, it is possible to easily form a coating surface with a high aesthetic appearance and a natural texture in which different color tones are mixed. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described in detail.

[0011] The present invention relates to a coating method for forming a coating surface having a mixture of different color tones. In the present invention, a coating surface is formed on a substrate using a specific water-based topcoat material.

[0012] [Surface to be coated] Examples of surfaces to be coated include those constituting the interior and exterior walls of buildings, civil engineering structures, etc. Examples of substrates that constitute the surfaces to be coated include concrete, mortar, porcelain tile, fiber-mixed cement board, cement calcium silicate board, slag cement perlite board, cement board, ALC board, siding board, gypsum board, plywood, extrusion-molded board, steel plate, plastic plate, etc. The surfaces of these substrates may be subjected to some kind of surface treatment (e.g., treatment with putty, sealer, surfacer, filler, etc.), or may have a coating film already formed thereon, wallpaper, etc. attached thereto, etc.

[0013] [Water-based top coating material] In the present invention, at least two types of water-based topcoat materials, i.e., a water-based topcoat material set, are used. Each of these water-based topcoat materials contains aggregate, extender pigment, water-based resin, and hydrophobic solvent, and at least one of these water-based topcoat materials contains color pigment. In the present invention, by using such at least two types of different color topcoats, it is possible to easily form a highly aesthetic coating surface with a natural texture that combines different color tones.

[0014] The aqueous topcoat material of the present invention contains aggregate as a main component. Such aggregate is a component that contributes to the impartation of a natural texture and the suppression of monochromatism. Examples of aggregate include crushed materials such as marble, granite, serpentine, granite, fluorite, kansui stone, feldspar, silica stone, and silica sand, crushed ceramics, crushed ceramics, crushed glass, glass beads, crushed resin, resin beads, metal particles, and the like, or those whose surfaces are colored and coated. These can be used alone or in combination of two or more types.

[0015] The water-based topcoat material can contain colored aggregate as an aggregate. As the colored aggregate, aggregate that can be visually recognized in some color can be used. The color of the colored aggregate may be, for example, naturally derived or artificially added. In the present invention, the use of such colored aggregate enables complex color development by the colored pigment and the colored aggregate, which can improve the texture, natural feeling, fineness, etc., and can also improve the effect of suppressing monochromatization.

[0016] The aggregate desirably has a larger average particle size than the extender pigments and color pigments described below. The average particle size of the aggregate is preferably 0.05 to 3 mm, more preferably 0.06 to 1 mm, even more preferably 0.07 to 0.5 mm, and particularly preferably 0.075 to 0.2 mm. When the aggregate has such an average particle size, a highly aesthetic coating surface can be formed with a relatively small amount of coating, and the coating can also be made thinner and lighter. The average particle size of the aggregate is a value obtained by sieving using a metal mesh sieve specified in JIS Z8801-1:2000 and calculating the average weight distribution. In the present invention, "α to β" is synonymous with "not less than α and not more than β."

[0017] The extender pigment in the aqueous topcoat material is a component that contributes to imparting a natural texture, imparting shade variation, suppressing monochromaticity, improving painting workability, etc. Examples of extender pigments include heavy calcium carbonate, light calcium carbonate, kaolin, clay, china clay, diatomaceous earth, hydrous finely powdered silicic acid, talc, baryte powder, barium sulfate, precipitated barium sulfate, barium carbonate, magnesium carbonate, silica powder, aluminum hydroxide, etc., and one or more of these can be used. The average particle size of the extender pigment is preferably less than 50 μm, more preferably 0.5 to 45 μm, and even more preferably 1 to 40 μm. The average particle size of the extender pigment is a value measured using a laser diffraction particle size distribution analyzer.

[0018] The blending ratio of the extender pigment can be 20 to 500 parts by weight, preferably 70 to 350 parts by weight, more preferably 90 to 300 parts by weight, and even more preferably 100 to 250 parts by weight, per 100 parts by weight of aggregate. Having a blending ratio of the extender pigment equal to or greater than the lower limit is advantageous in terms of imparting a natural texture, imparting shade variation, preventing monochromaticity, improving coating workability, etc. Having a blending ratio of the extender pigment equal to or less than the upper limit is advantageous in terms of imparting a natural texture, improving coating workability, preventing coating cracking, etc.

[0019] In the present invention, at least one water-based topcoat material contains a coloring pigment. The coloring pigment is a component that contributes to the color development of the coating surface. Examples of coloring pigments include titanium oxide, zinc oxide, carbon black, graphite, black iron oxide, iron-manganese composite oxide, iron-copper-manganese composite oxide, iron-chromium composite oxide, iron-chromium-cobalt composite oxide, copper-chromium composite oxide, copper-manganese-chromium composite oxide, copper-magnesium composite oxide, bismuth-manganese composite oxide, 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. These can be used alone or in combination of two or more. The average particle size of the color pigment is preferably 2 μm or less, more preferably 0.01 to 1 μm. The average particle size of the color pigment is a value measured by a laser diffraction particle size distribution measuring device.

[0020] When the aqueous topcoat material contains a coloring pigment, the mixing ratio of the coloring pigment can be 1 to 100 parts by weight in terms of solid content relative to 100 parts by weight of aggregate, preferably 2 to 80 parts by weight, more preferably 3 to 60 parts by weight, and even more preferably 4 to 40 parts by weight. By having the mixing ratio of the coloring pigment be above the above lower limit, it is suitable in terms of color development, hiding power, imparting shade changes, etc. By having the mixing ratio of the coloring pigment be below the above upper limit, it is suitable in terms of imparting a natural texture, suppressing film cracking, etc. When two or more aqueous topcoat materials contain a coloring pigment, at least one (preferably two or more) aqueous topcoat material should satisfy the above coloring pigment mixing ratio conditions.

[0021] The aqueous resin in the aqueous topcoat material is a component that plays a role in fixing aggregates, extender pigments, color pigments, etc. As the aqueous resin, a water-soluble resin and / or a water-dispersible resin (resin emulsion) can be used, and an embodiment containing a water-dispersible resin is particularly suitable. By using a water-soluble resin and / or a water-dispersible resin, an aqueous topcoat material can be obtained. Examples of resin types include cellulose, polyvinyl alcohol, ethylene resin, vinyl acetate resin, polyester resin, alkyd resin, vinyl chloride resin, epoxy resin, acrylic resin, urethane resin, acrylic silicone resin, fluororesin, etc., or composites thereof. These can be used alone or in combination of two or more. In addition, these aqueous resins may be either crosslinkable or non-crosslinkable. The glass transition temperature of the aqueous resin is preferably -30 to 70 ° C, more preferably -20 to 50 ° C. The glass transition temperature can be calculated using the Fox formula.

[0022] When a binder having cross-linking reactivity is used as the aqueous resin, the durability and weather resistance of the coating can be improved, defects such as cracking, peeling, and swelling can be prevented, and the initial aesthetic appearance can be maintained for a long period of time. Examples of such aqueous resins include those that undergo a cross-linking reaction between a reactive functional group-containing aqueous resin and its cross-linking agent, and those that undergo a cross-linking reaction between reactive functional group-containing aqueous resins.

[0023] Examples of such combinations of reactive functional groups include combinations of a carboxyl group and a carbodiimide group, a carboxyl group and an epoxy group, a carboxyl group and an aziridine group, a carboxyl group and an oxazoline group, a hydroxyl group and an isocyanate group, a carbonyl group and a hydrazide group, an epoxy group and a hydrazide group, an epoxy group and an amino group, an aldo group and a semicarbazide group, a keto group and a semicarbazide group, alkoxysilyl groups, and a carboxyl group and a metal compound. These can be used alone or in combination of two or more.

[0024] The mixing ratio of the aqueous resin can be 3 to 30 parts by weight, preferably 4 to 25 parts by weight, more preferably 5 to 20 parts by weight, and even more preferably 6 to 19 parts by weight, per 100 parts by weight of aggregate, calculated as solids. Having the mixing ratio of the aqueous resin at or above the lower limit is preferable in terms of improving coating workability and preventing film cracking. Having the mixing ratio of the aqueous resin at or below the upper limit is preferable in terms of improving coating workability and imparting a natural texture.

[0025] The hydrophobic solvent in the water-based topcoat material is a component that contributes to improving the paint workability, suppressing film cracking, and ultimately improving the aesthetic appearance of the film.

[0026] The hydrophobic solvent preferably contains a hydrophobic solvent whose solubility in water at 20° C. is 10 g / 100 g H2O or less (more preferably 8 g / 100 g H2O or less, even more preferably 6 g / 100 g H2O or less, and particularly preferably 5 g / 100 g H2O or less). Note that the solubility in water at 20° C. refers to the maximum mass (g) of the target solvent that can be dissolved in 100 g of water.

[0027] Specific examples of hydrophobic solvents include ethylene glycol monohexyl ether, ethylene glycol-2-ethylhexyl ether, ethylene glycol monobutyl ether acetate, ethylene glycol dibutyl ether, diethylene glycol monohexyl ether, diethylene glycol monobutyl ether acetate, diethylene glycol dibutyl ether, propylene glycol monobutyl ether, propylene glycol phenyl ether, propylene glycol diacetate, dipropylene glycol monobutyl ether, dipropylene glycol tertiary butyl ether, tripropylene glycol monobutyl ether, octylene glycol, 2-ethylhexylene glycol, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, benzyl alcohol, etc. These can be used alone or in combination of two or more.

[0028] The mixing ratio of the hydrophobic solvent can be 0.1 to 50 parts by weight per 100 parts by weight of aggregate, preferably 0.5 to 40 parts by weight, more preferably 0.8 to 30 parts by weight, and even more preferably 1 to 20 parts by weight. By having the mixing ratio of the hydrophobic solvent be above the above lower limit, it is suitable in terms of improving paint workability, suppressing film cracking, etc. By having the mixing ratio of the hydrophobic solvent be below the above upper limit, it is suitable in terms of ensuring the stability of the water-based topcoat material, and it is possible to fully obtain the effects of improving paint workability, suppressing film cracking, etc.

[0029] Each aqueous topcoat material can contain other components than those mentioned above, as long as they do not significantly impair the effects of the present invention. Such components include, for example, thickeners, film-forming aids, leveling agents, wetting agents, plasticizers, antifreeze agents, pH adjusters, preservatives, antifungal agents, anti-algae agents, antibacterial agents, dispersants, antifoaming agents, adsorbents, fibers, water repellents, hydrophilizing agents, crosslinking agents, coupling agents, hydrophilic solvents, ultraviolet absorbers, light stabilizers, antioxidants, catalysts, etc.

[0030] The aqueous topcoat material of the present invention can be produced by uniformly mixing the above-mentioned aggregate, extender pigment, coloring pigment, aqueous resin, hydrophobic solvent, and, if necessary, the above-mentioned components, etc., by a conventional method.

[0031] The viscosity of the water-based topcoat material is preferably 5 to 150 Pa·s, more preferably 15 to 100 Pa·s, and even more preferably 25 to 75 Pa·s. By ensuring the water-based topcoat material's paintability, it is possible to enhance the effects of suppressing monochromaticity of the formed coating, imparting shade variations, and improving aesthetics. The viscosity referred to here is the viscosity at 20 rpm (the guideline value at the fourth rotation) measured with a BH-type viscometer at a temperature of 23 ° C.

[0032] The aqueous topcoat material set of the present invention consists of at least two different types of aqueous topcoat materials. In the present invention, the color tones of the at least two types of aqueous topcoat materials need only be visually discernible, and the color difference between them (ΔE) is preferably 1 or more, more preferably 2 or more. The color tone of each aqueous topcoat material can be appropriately set, for example, by blending aggregates, color pigments, etc. When the aqueous topcoat material set consists of two types of aqueous topcoat materials, it is sufficient that the mutual color tones are different. When the aqueous topcoat material set consists of three or more types of aqueous topcoat materials, it is sufficient that at least one of the other aqueous topcoat materials is a different color from one standard aqueous topcoat material.

[0033] In the present invention, by setting the color difference of each water-based topcoat material relatively small (for example, color difference 1 to 10), it is possible to form a coating surface with a subtle change in color. On the other hand, by setting the color difference of each water-based topcoat material relatively large (for example, color difference more than 10), it is possible to form a coating surface in which the color shades etc. can be clearly seen.

[0034] In addition, the color difference (ΔE) in this invention is the value measured using a colorimeter for the dry coating film of each water-based topcoat material (formed on standard white paper with a dry thickness of 1 mm), and the L of each dry coating film * value, a * value, b * It can be calculated using the following formula from the value (average value of 10 or more measurement points). <Formula>△E={(L * 1-L * 2) 2 +(a * 1-a * 2) 2 +(b * 1-b * 2) 2} 0.5 (In the formula, L * 1, a * 1, b * 1 is the standard L of one type of topcoat material * , a * , b * .L * 2, a * 2, b * 2 is the L of other topcoat materials * , a * , b * )

[0035] The aqueous topcoat material set of the present invention consists of at least two aqueous topcoat materials that meet the above-mentioned conditions. At least one of these aqueous topcoat materials contains a coloring pigment. When such an aqueous topcoat material set consists of two aqueous topcoat materials, the form is as follows: One water-based topcoat contains color pigments, and the other water-based topcoat does not contain color pigments. Both types of water-based topcoats contain color pigments etc.

[0036] In addition, when the water-based topcoat material set consists of three or more topcoat materials, the form is as follows: One water-based topcoat contains color pigments, and the other water-based topcoat does not contain color pigments. Two or more water-based topcoats contain color pigments, and other water-based topcoats do not contain color pigments. Three or more types of water-based topcoats all contain color pigments etc.

[0037] In the aqueous topcoat material set of the present invention, it is desirable that the average particle size of the aggregate contained in each aqueous topcoat material is approximately the same. The absolute value of the difference in the average particle size of the aggregate contained in each aqueous topcoat material is preferably 0.1 mm or less, more preferably 0.05 mm or less.

[0038] [Film formation method] In the present invention, the coating surface is (1) A process of applying at least two types of water-based topcoats to form a coating surface; (2) A step of supplying water and / or a hydrophilic solvent to the coating surface and leveling the coating surface using a pressing tool; (3) A step of drying the coated surface; Do the following.

[0039] In the present invention, a primer coating can be formed by applying a primer material before step (1).

[0040] The primer may contain, for example, a binder and a pigment component, such as a color pigment, an extender pigment, or an aggregate.

[0041] Various resins can be used as binders. Examples of resins include cellulose, polyvinyl alcohol, ethylene resin, vinyl acetate resin, polyester resin, alkyd resin, vinyl chloride resin, epoxy resin, acrylic resin, urethane resin, acrylic silicone resin, fluororesin, and the like, as well as composites thereof. These can be used alone or in combination of two or more. Examples of binder forms include water-soluble resins, water-dispersible resins (resin emulsions), solvent-soluble resins, solventless resins, non-water-dispersible resins, and powdered resins. Among these, water-soluble resins and / or water-dispersible resins are preferred, and embodiments containing water-dispersible resins are particularly suitable. By using water-soluble resins and / or water-dispersible resins, an aqueous primer can be obtained. Furthermore, these binders may be either crosslinkable or non-crosslinkable. When a crosslinkable binder is used as the binder, the adhesion and durability of the coating can be improved, cracking, peeling, swelling, and other defects can be prevented, and the initial aesthetic appearance can be maintained for a long period of time.

[0042] Examples of color pigments include titanium oxide, zinc oxide, carbon black, graphite, black iron oxide, iron-manganese composite oxide, iron-copper-manganese composite oxide, iron-chromium composite oxide, iron-chromium-cobalt composite oxide, copper-chromium composite oxide, copper-manganese-chromium composite oxide, copper-magnesium composite oxide, bismuth-manganese composite oxide, 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. These pigments can be used alone or in combination. The average particle size of the color pigment is preferably 2 μm or less, more preferably 0.01 to 1 μm. The average particle size of the color pigment is a value measured by a laser diffraction particle size distribution measuring device.

[0043] Examples of extender pigments include heavy calcium carbonate, light calcium carbonate, kaolin, clay, china clay, diatomaceous earth, hydrous finely powdered silicic acid, talc, baryte powder, barium sulfate, precipitated barium sulfate, barium carbonate, magnesium carbonate, silica powder, and aluminum hydroxide, and one or more of these can be used. The average particle size of the extender pigment is preferably less than 50 μm, more preferably 0.5 to 45 μm, and even more preferably 1 to 40 μm. The average particle size of the extender pigment is a value measured using a laser diffraction particle size distribution analyzer.

[0044] Examples of aggregates include crushed materials such as marble, granite, serpentine, granite, fluorite, kansuiite, feldspar, silica stone, and silica sand; crushed ceramics; crushed ceramics; crushed glass; crushed glass beads; crushed resin; resin beads; metal particles; and colored coated aggregates. These materials can be used alone or in combination. The average particle size of the aggregate is preferably 0.05 to 3 mm, more preferably 0.06 to 1 mm. The average particle size of the aggregate is determined by sieving the aggregate using a metal mesh sieve specified in JIS Z8801-1:2000 and calculating the average weight distribution.

[0045] The primer preferably contains at least an extender pigment and / or aggregate as a pigment component. By including an extender pigment and / or aggregate in the primer, it becomes easier to impart a fine uneven structure to the surface of the primer film, which is preferable in terms of manifesting the effects of the present invention. In addition, by including a coloring pigment in the primer, the primer film can be set to the desired color tone, and can also be set to a color similar to that of the topcoat material.

[0046] For example, a primer with a pigment volume concentration of 20% or more can be used as the primer. By forming a primer film using such a primer, the painting work (application or spreading) of the topcoat material in step (1) can be carried out stably and efficiently, which is advantageous in terms of improving aesthetics, etc. It is thought that this effect is achieved by imparting a fine uneven structure to the surface of the primer film.

[0047] The pigment volume concentration of the primer can be 20% or more, preferably 30-90%, more preferably 40-80%. The pigment volume concentration of the primer is the volume percentage of the pigment component contained in the dried coating of the primer, and is a value calculated from the blending amount of the binder and pigment component that make up the primer. The specific gravity of the binder is 1.

[0048] The primer material can also contain other components than those mentioned above, as long as they do not significantly impair the effects of the present invention. Such components include, for example, thickeners, film-forming aids, leveling agents, wetting agents, plasticizers, antifreeze agents, pH adjusters, preservatives, antifungal agents, anti-algae agents, antibacterial agents, dispersants, antifoaming agents, adsorbents, fibers, water repellents, hydrophilizing agents, crosslinking agents, coupling agents, ultraviolet absorbers, light stabilizers, antioxidants, catalysts, etc.

[0049] The primer can be produced by uniformly mixing the above-mentioned binder, pigment component, and, if necessary, the above-mentioned components, etc., in a conventional manner.

[0050] The primer can be applied by, for example, spray coating, roller coating, trowel coating, brush coating, etc. The amount of primer applied is preferably 0.05 to 1 kg / m 2 , more preferably 0.1 to 0.5 kg / m 2 Within this range of application amount, it is possible to apply the primer in multiple steps. The application and drying of the primer may be preferably carried out at room temperature (0 to 40°C).

[0051] When the pigment volume concentration of the primer is 20% or more, the primer film formed by the primer can be a matte film. In this case, the specular gloss of the primer film (measurement angle 60 degrees) is preferably 40 or less, more preferably 20 or less, even more preferably 10 or less, and particularly preferably 6 or less. Such a primer is suitable in terms of improving the effects of the present invention. The specular gloss of the primer film is measured by applying the primer to one side of a glass plate using a film applicator with a gap of 150 μm, placing the coated surface horizontally under standard conditions (temperature 23 ° C, relative humidity 50%), drying for 48 hours, and then measuring the specular gloss at a geometric angle of 60 degrees using a specular gloss meter.

[0052] In the present invention, after applying the above-mentioned primer to the surface to be coated as necessary, the water-based topcoat is applied as step (1). When using a primer, it is desirable to apply the water-based topcoat after the coating of the primer has dried.

[0053] In step (1), at least two types of water-based topcoat materials are applied to form a painted surface. In step (1), painting is carried out using the water-based topcoat set described above. In step (1), each water-based topcoat material is applied to the surface to be painted so that the water-based topcoat materials are mixed on the surface to be painted, and the painted surface is formed by spreading them. This makes it possible to form a coating surface with a mixture of different color tones. The amount of water-based topcoat material applied (total amount of each water-based topcoat material applied) is preferably 0.1 to 3 kg / m 2 , more preferably 0.2 to 2 kg / m 2 , and more preferably 0.3 to 1 kg / m 2 , and particularly preferably 0.4 to 0.9 kg / m 2 In the present invention, a coating surface with excellent aesthetics can be formed with a relatively small amount of coating, and the coating can also be made thinner and lighter.

[0054] When applying each water-based topcoat material to a substrate, tools such as a sprayer, roller, trowel, or spatula can be used. The application of each water-based topcoat material to a substrate can be carried out so that the water-based topcoats are mixed and applied to the same substrate before drying. For example, each water-based topcoat material can be applied in a scattered state, adjacent state, partially mixed state, or overlapping state on the substrate. The shape and amount of each water-based topcoat material applied to the substrate can be appropriately set depending on the desired finish, aesthetics, etc.

[0055] When spreading the water-based topcoat material, tools such as trowels, spatulas, rollers, etc. can be used. When using a trowel, spatula, etc. to spread the water-based topcoat material, it is easier to obtain a flat coating surface by leveling the coating surface.

[0056] In the present invention, it is desirable to form the coating surface using a trowel in step (1). Specifically, it is desirable to use a trowel at least when spreading the water-based topcoat material, and it is more desirable to use a trowel when applying the water-based topcoat material to the surface to be coated and when spreading the water-based topcoat material.

[0057] In the present invention, in step (2), water and / or a hydrophilic solvent (hereinafter simply referred to as "water, etc.") is supplied to the surface of the water-based topcoat material, and the surface is leveled using a pressing tool. This step (2) can be performed on part or the entire surface obtained in step (1), and the supply of water, etc. should be performed at least on the area to be leveled using the pressing tool.

[0058] To supply water or the like to the coating surface, for example, a method using a spray bottle or a method of applying water or the like to a pressing tool (for example, a trowel, spatula, roller, etc.) can be adopted. In the latter case, the work of supplying water or the like to the coating surface and the work of leveling the coating surface can be carried out simultaneously.

[0059] In the present invention, by carrying out step (2), it is possible to sufficiently impart color effects such as natural changes in shade, and further enhance aesthetics, etc. Such effects are thought to be achieved by the bleeding action of the color pigment on the painted surface before drying, which makes it easier for the boundaries between different colored water-based topcoats to become visually blurred.

[0060] The type of water and / or hydrophilic solvent supplied to the coating surface may be appropriately selected depending on the water-based topcoat material used. As the hydrophilic solvent, for example, one or more selected from alcohol-based solvents, ether-based solvents, ester-based solvents, etc., whose solubility in water at 20 ° C is greater than 10 g / 100 gH2O (preferably 20 g / 100 gH2O or more, more preferably ∞), can be used. In step (2), water or a mixture of water and a hydrophilic solvent can be preferably used. The amount of water, etc. supplied to the coating surface may be appropriately determined taking into account the drying speed and aesthetics of the coating surface.

[0061] The timing for supplying water etc. to the coating surface is after step (1) and before the coating surface dries. Specifically, it is desirable to supply water etc. to the coating surface within 30 minutes (more preferably within 15 minutes) after the end of step (1) (after spreading the water-based topcoat material).

[0062] The pressing tool can be, for example, one or more selected from a trowel, a spatula, a roller, etc. When leveling the coating surface using a pressing tool, a method of lightly pressing the coating surface with the pressing tool can be used. The operation of leveling the coating surface using a pressing tool can be performed on part or the entire coating surface. Any water remaining on the coating surface can be removed as appropriate.

[0063] In step (3), the coated surface obtained by the above method is dried. The drying temperature is preferably 0°C or higher and 40°C or lower (room temperature), and heating can be performed if necessary. The drying time is preferably 2 hours or longer.

[0064] By using the above method, the present invention can easily obtain a coating surface with excellent aesthetics, featuring a mixture of different color tones and a natural texture. The color tone of the coating surface formed by the present invention is based on the color tone of at least two types of water-based topcoat materials, but partial mixing of the water-based topcoat materials and bleeding of color pigments can create color effects such as gradation and blurring, and can impart natural shade changes. Near the boundaries between water-based topcoat materials, coating cracking is sufficiently suppressed, allowing the formation of a seamless coating. For example, by using a white or gray water-based topcoat material, a coating surface with aesthetics such as mortar or concrete can be formed.

[0065] In addition, in the present invention, the formed coating surface can be flattened, for example, the entire formed coating surface can be flattened, and if the coating surface has various uneven patterns, it can also flatten a part of it. The dry film thickness of such an aqueous topcoat material coating is preferably 0.03 to 2 mm, more preferably 0.05 to 1 mm, and even more preferably 0.1 to 0.5 mm.

[0066] The reasons for the above-mentioned effects of the present invention include, but are not limited to, the following: when forming a coating surface by applying multiple water-based topcoats, the properties of the water-based topcoats containing hydrophobic solvents, etc., prevent the water supplied to the coating surface from seeping into the coating film. This allows for efficient smoothing using a pressure tool by utilizing the water on the coating surface, and it is also thought that coating cracking caused by water can be suppressed. Furthermore, due to the action of aggregates and extender pigments, etc., monochromatism is suppressed on the formed coating surface, resulting in a mixture of multiple colored areas with a natural texture. At the same time, near the boundaries between the water-based topcoats, color changes are alleviated by the bleeding action of the coloring pigments, resulting in a visually blurred boundary. In the present invention, such visual effects produce natural shade changes, and, combined with the flattening effect of the coating and the crack suppression effect, it is thought that the aesthetics are enhanced.

[0067] In the present invention, after the above steps, a polishing step and / or a clear coating step may be carried out.

[0068] The polishing treatment can be carried out for the purpose of improving the smoothness of the coating surface. The polishing treatment may be carried out by a known method using a coated abrasive or the like. The particle size of the coated abrasive can be selected appropriately depending on the desired degree of smoothness. The treatment may also be carried out using two or more types of coated abrasive. Furthermore, in the polishing treatment, the coating surface may be wetted with water or the like as necessary while polishing. Powder generated by polishing may be removed with an air blower or a rag or the like.

[0069] The clear coating process can be carried out for purposes such as surface protection, improved weather resistance, improved stain resistance, and improved finish. Examples of finishing materials used in clear coating include clear finishing materials that use acrylic resin, urethane resin, epoxy resin, acrylic silicone resin, fluororesin, etc. as a binder. The clear finishing material may be either water-based or solvent-based, may be either colorless and transparent, or colored and transparent, and may be either glossy or matte (including 70% gloss, 50% gloss, 30% gloss, etc.).

[0070] The clear finish can be applied by various methods such as brush coating, spray coating, roller coating, etc. The amount of coating is preferably 0.01 to 0.5 kg / m. 2 , more preferably 0.03 to 0.4 kg / m 2 Within this range of application amount, it is possible to apply the coating in multiple steps. [Example]

[0071] The following examples will be given to clarify the features of the present invention, but the present invention is not limited to these examples.

[0072] The following raw materials were used to manufacture the topcoat material: Aggregate A: White silica sand (average particle size 150 μm) Aggregate B: Gray silica sand (average particle size 100 μm) Extender pigment A: Heavy calcium carbonate (average particle size 15 μm) Extender pigment B: Heavy calcium carbonate (average particle size 28 μm) Extender pigment C: Talc (average particle size 8 μm) Water-based resin A: Acrylic resin emulsion (solid content 50% by weight, glass transition temperature 30°C) Water-based resin B: Alkoxysilyl group-containing acrylic resin emulsion (solid content 50% by weight, glass transition temperature 22°C) Hydrophobic solvent A: 2,2,4-trimethyl-1,3-pentanediol diisobutyrate (solubility in water at 20°C: 0.04 g / 100 g H2O) Hydrophobic solvent B: Dipropylene glycol monobutyl ether (solubility in water at 20°C: 5g / 100gH2O) Hydrophilic solvent A: Ethylene glycol monobutyl ether (solubility in water at 20°C is infinite) Hydrophilic solvent B: Dipropylene glycol monopropyl ether (solubility in water at 20°C: 19 g / 100 g H2O) Color pigment A: Black pigment dispersion (20% by weight dispersion of carbon black (average particle size 0.05 μm)) Color pigment B: Yellow pigment dispersion (50% by weight dispersion of yellow iron oxide (average particle size 0.5 μm)) Color pigment C: Red pigment dispersion (50% by weight dispersion of red iron oxide (average particle size 0.2 μm)) Color pigment D: White pigment dispersion (60% by weight dispersion of titanium dioxide (average particle size 0.3 μm)) Fiber: inorganic fiber (average fiber length 0.1 mm) Antifreeze: Ethylene glycol Dispersant: Polycarboxylic acid dispersant Thickener: Hydroxyethyl cellulose 3% by weight aqueous solution Antifoaming agent: Silicone-based antifoaming agent

[0073] Example 1 Manufacture of topcoat material 1 Topcoat material 1 (light gray, viscosity 48 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate A with 150 parts by weight of extender pigment A, 32 parts by weight of aqueous resin A (16 parts by weight of solids), 3 parts by weight of hydrophobic solvent A, 0.03 parts by weight of coloring pigment A, 0.03 parts by weight of coloring pigment B, 0.01 parts by weight of coloring pigment C, 11 parts by weight of coloring pigment D, 3 parts by weight of fiber, 1 part by weight of dispersant, 30 parts by weight of thickener, 10 parts by weight of water, and 1 part by weight of antifoaming agent in the usual manner.

[0074] ・Production of topcoat material 2 Topcoat material 2 (dark gray, viscosity 47 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate A, 150 parts by weight of extender pigment A, 32 parts by weight of aqueous resin A (16 parts by weight of solids), 3 parts by weight of hydrophobic solvent A, 3 parts by weight of coloring pigment A, 3 parts by weight of coloring pigment B, 1 part by weight of coloring pigment C, 6 parts by weight of coloring pigment D, 3 parts by weight of fiber, 1 part by weight of dispersant, 30 parts by weight of thickener, 10 parts by weight of water, and 1 part by weight of antifoaming agent in the usual manner.

[0075] As a result, a topcoat set consisting of topcoat material 1 and topcoat material 2 was obtained. The color difference between topcoat material 1 and topcoat material 2 was 17.

[0076] The substrate was a slate board that had been pre-coated with a sealer. Gray primer 1 (a water-based primer consisting primarily of acrylic resin emulsion (resin specific gravity 1.0), titanium dioxide (average particle size 0.3 μm, specific gravity 4.2), carbon black (average particle size 0.05 μm, specific gravity 1.8), talc (average particle size 8 μm, specific gravity 2.7), and ground calcium carbonate (average particle size 5 μm, specific gravity 2.6) with a pigment volume concentration of 50% and a specular gloss of 2 (measurement angle 60 degrees)) was applied to the substrate at a rate of 0.2 kg / m. 2 The paint was applied with a wool roller at 100°C, dried for 3 hours, and a primer coating was formed. Next, topcoat material 1 and topcoat material 2 were applied with a trowel so that they were adjacent to each other and mixed in a partially overlapping state on this primer coating, and then immediately spread and smoothed with a trowel to form a painted surface (topcoat material 1 applied at a rate of 0.3 kg / m). 2 , Topcoat material 2 application amount 0.3 kg / m 2) Next, water was sprayed onto the surface of the coating, and the surface was smoothed again with a trowel, after which it was allowed to dry for 24 hours. This method resulted in the formation of a flat, mortar-like coating surface (dry film thickness 0.3 mm) with a mixture of light and dark gray areas, and visible variations in shade due to the intermediate color tones. No cracks were observed on the coating surface, and it had a seamless appearance.

[0077] Example 2 Manufacture of topcoat material 3 Topcoat material 3 (pale orange, viscosity 47 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate A with 120 parts by weight of extender pigment A, 28 parts by weight of aqueous resin A (14 parts by weight of solids), 3 parts by weight of hydrophobic solvent A, 0.2 parts by weight of coloring pigment B, 0.3 parts by weight of coloring pigment C, 11 parts by weight of coloring pigment D, 3 parts by weight of fiber, 1 part by weight of dispersant, 30 parts by weight of thickener, 10 parts by weight of water, and 1 part by weight of antifoaming agent in the usual manner.

[0078] Manufacture of topcoat material 4 Topcoat material 4 (dark orange, viscosity 46 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate A with 120 parts by weight of extender pigment A, 28 parts by weight of aqueous resin A (14 parts by weight of solids), 3 parts by weight of hydrophobic solvent A, 0.2 parts by weight of coloring pigment A, 6 parts by weight of coloring pigment B, 10 parts by weight of coloring pigment C, 6 parts by weight of coloring pigment D, 3 parts by weight of fiber, 1 part by weight of dispersant, 30 parts by weight of thickener, 10 parts by weight of water, and 1 part by weight of antifoaming agent in the usual manner.

[0079] As a result, a topcoat set consisting of topcoat material 3 and topcoat material 4 was obtained. The color difference between topcoat material 3 and topcoat material 4 was 22.

[0080] The substrate was a slate board that had been pre-coated with a sealer. An orange primer 2 (a water-based primer consisting primarily of acrylic resin emulsion (resin specific gravity 1.0), carbon black (average particle size 0.05 μm, specific gravity 1.8), yellow iron oxide (average particle size 0.5 μm, specific gravity 4.0), red iron oxide (average particle size 0.2 μm, specific gravity 5.0), titanium dioxide (average particle size 0.3 μm, specific gravity 4.2), talc (average particle size 8 μm, specific gravity 2.7), and clay (average particle size 4 μm, specific gravity 2.6) was applied to the substrate at a rate of 0.2 kg / m. The pigment volume concentration was 58%, and the specular gloss level was 1.5 (measurement angle 60 degrees). 2 The paint was applied with a wool roller at 100°C, dried for 3 hours, and a primer coating was formed. Next, topcoat material 3 and topcoat material 4 were applied with a trowel so that they were adjacent to each other and mixed in a partially overlapping state on this primer coating, and then immediately spread and smoothed with a trowel to form a painted surface (application amount of topcoat material 3: 0.3 kg / m 2 , Topcoat material 4 application amount 0.3 kg / m 2 ) Next, water was sprayed onto the surface of the coating, the surface was smoothed again with a trowel, and then it was left to dry for 24 hours. This method resulted in the formation of a flat orange coating surface (dry film thickness 0.3 mm) with a mixture of light orange and dark orange areas, and visible changes in shade due to the intermediate color tones. No cracks were observed on the coating surface, and it had a seamless appearance.

[0081] Example 3 Manufacture of topcoat material 5 Topcoat material 5 (light gray, viscosity 52 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate A with 210 parts by weight of extender pigment A, 35 parts by weight of aqueous resin A (17.5 parts by weight of solids), 3 parts by weight of hydrophobic solvent A, 0.03 parts by weight of coloring pigment A, 0.03 parts by weight of coloring pigment B, 0.01 parts by weight of coloring pigment C, 11 parts by weight of coloring pigment D, 3 parts by weight of fiber, 1 part by weight of dispersant, 26 parts by weight of thickener, 14 parts by weight of water, and 1 part by weight of antifoaming agent in a conventional manner.

[0082] Manufacture of topcoat material 6 Topcoat material 6 (dark gray, viscosity 50 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate A with 210 parts by weight of extender pigment A, 35 parts by weight of aqueous resin A (17.5 parts by weight of solids), 3 parts by weight of hydrophobic solvent A, 3 parts by weight of coloring pigment A, 3 parts by weight of coloring pigment B, 1 part by weight of coloring pigment C, 6 parts by weight of coloring pigment D, 3 parts by weight of fiber, 1 part by weight of dispersant, 26 parts by weight of thickener, 14 parts by weight of water, and 1 part by weight of antifoaming agent in a conventional manner.

[0083] As a result, a topcoat set consisting of topcoat material 5 and topcoat material 6 was obtained. The color difference between topcoat material 5 and topcoat material 6 was 16.

[0084] Instead of topcoat materials 1 and 2, topcoat materials 5 and 6 were used, and the coating surface was formed in the same manner as in Example 1. As a result, a flat mortar-like coating surface (dry film thickness 0.3 mm) was obtained in which light gray and dark gray areas were mixed and the shade changes due to these intermediate colors were visible. No cracks were observed on the coating surface, and it had a seamless appearance.

[0085] Example 4 · Manufacture of topcoat material 7 Topcoat material 7 (light gray, viscosity 46 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate A, 100 parts by weight of extender pigment A, 20 parts by weight of aqueous resin A (10 parts by weight of solids), 3 parts by weight of hydrophobic solvent A, 0.03 parts by weight of coloring pigment A, 0.03 parts by weight of coloring pigment B, 0.01 parts by weight of coloring pigment C, 11 parts by weight of coloring pigment D, 3 parts by weight of fiber, 1 part by weight of dispersant, 30 parts by weight of thickener, 6 parts by weight of water, and 1 part by weight of antifoaming agent in a conventional manner.

[0086] · Manufacture of topcoat material 8 Topcoat material 8 (dark gray, viscosity 46 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate A, 100 parts by weight of extender pigment A, 20 parts by weight of aqueous resin A (10 parts by weight of solids), 3 parts by weight of hydrophobic solvent A, 3 parts by weight of coloring pigment A, 3 parts by weight of coloring pigment B, 1 part by weight of coloring pigment C, 6 parts by weight of coloring pigment D, 3 parts by weight of fiber, 1 part by weight of dispersant, 30 parts by weight of thickener, 6 parts by weight of water, and 1 part by weight of defoamer in a conventional manner.

[0087] As a result, a topcoat set consisting of topcoat material 7 and topcoat material 8 was obtained. The color difference between topcoat material 7 and topcoat material 8 was 17.

[0088] Instead of topcoat materials 1 and 2, topcoat materials 7 and 8 were used, and the coating surface was formed in the same manner as in Example 1. As a result, a flat mortar-like coating surface (dry film thickness 0.3 mm) was obtained in which light gray and dark gray areas were mixed and the shade changes due to these intermediate colors were visible. No cracks were observed on the coating surface, and it had a seamless appearance.

[0089] Example 5 Manufacture of topcoat material 9 Topcoat material 9 (light gray, viscosity 53 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate A with 100 parts by weight of extender pigment A, 70 parts by weight of extender pigment B, 38 parts by weight of aqueous resin B (19 parts by weight in terms of solids), 4 parts by weight of hydrophobic solvent B, 0.03 parts by weight of coloring pigment A, 0.03 parts by weight of coloring pigment B, 0.01 parts by weight of coloring pigment C, 11 parts by weight of coloring pigment D, 3 parts by weight of fiber, 1 part by weight of dispersant, 30 parts by weight of thickener, 6 parts by weight of water, and 1 part by weight of antifoaming agent in a conventional manner.

[0090] Manufacture of topcoat material 10 Topcoat material 10 (dark gray, viscosity 52 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate A with 100 parts by weight of extender pigment A, 70 parts by weight of extender pigment B, 38 parts by weight of aqueous resin B (19 parts by weight in solids equivalent), 4 parts by weight of hydrophobic solvent B, 3 parts by weight of coloring pigment A, 3 parts by weight of coloring pigment B, 1 part by weight of coloring pigment C, 6 parts by weight of coloring pigment D, 3 parts by weight of fiber, 1 part by weight of dispersant, 30 parts by weight of thickener, 6 parts by weight of water, and 1 part by weight of antifoaming agent in a conventional manner.

[0091] As a result, a coating material set consisting of topcoat material 9 and topcoat material 10 was obtained. The color difference between topcoat material 9 and topcoat material 10 was 18.

[0092] Instead of topcoat materials 1 and 2, topcoat materials 9 and 10 were used, and the coating surface was formed in the same manner as in Example 1. As a result, a flat mortar-like coating surface (dry film thickness 0.3 mm) was obtained in which light gray and dark gray areas were mixed and the shade changes due to these intermediate colors were visible. No cracks were observed on the coating surface, and it had a seamless appearance.

[0093] Example 6 · Manufacture of topcoat material 11 Topcoat material 11 (light gray, viscosity 52 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate B with 110 parts by weight of extender pigment B, 20 parts by weight of extender pigment C, 16 parts by weight of aqueous resin A (8 parts by weight of solids), 2 parts by weight of hydrophobic solvent B, 0.1 parts by weight of coloring pigment B, 0.03 parts by weight of coloring pigment C, 38 parts by weight of coloring pigment D, 3 parts by weight of fiber, 0.5 parts by weight of antifreeze agent, 1 part by weight of dispersant, 38 parts by weight of thickener, and 1 part by weight of antifoaming agent in a conventional manner.

[0094] · Manufacture of topcoat material 12 Topcoat material 12 (dark gray, viscosity 50 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate B with 110 parts by weight of extender pigment B, 20 parts by weight of extender pigment C, 16 parts by weight of aqueous resin A (8 parts by weight of solids), 2 parts by weight of hydrophobic solvent B, 2 parts by weight of coloring pigment D, 3 parts by weight of fiber, 0.5 parts by weight of antifreeze, 1 part by weight of dispersant, 22 parts by weight of thickener, 8 parts by weight of water, and 1 part by weight of antifoaming agent in a conventional manner.

[0095] As a result, a coating material set consisting of topcoat material 11 and topcoat material 12 was obtained. The color difference between topcoat material 11 and topcoat material 12 was 25.

[0096] Instead of topcoat materials 1 and 2, topcoat materials 11 and 12 were used, and the coating surface was formed in the same manner as in Example 1. As a result, a flat mortar-like coating surface (dry film thickness 0.3 mm) was obtained in which light gray and dark gray areas were mixed and the shade changes due to these intermediate colors were visible. No cracks were observed on the coating surface, and it had a seamless appearance.

[0097] (Comparative Example 1) Manufacture of topcoat material 13 Topcoat material 13 (light gray, viscosity 50 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate A with 210 parts by weight of extender pigment A, 35 parts by weight of aqueous resin A (17.5 parts by weight of solids), 3 parts by weight of hydrophilic solvent A, 0.03 parts by weight of coloring pigment A, 0.03 parts by weight of coloring pigment B, 0.01 parts by weight of coloring pigment C, 11 parts by weight of coloring pigment D, 3 parts by weight of fiber, 1 part by weight of dispersant, 26 parts by weight of thickener, 14 parts by weight of water, and 1 part by weight of antifoaming agent in a conventional manner.

[0098] Manufacture of topcoat material 14 Topcoat material 14 (dark gray, viscosity 49 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate A with 210 parts by weight of extender pigment A, 35 parts by weight of aqueous resin A (17.5 parts by weight of solids), 3 parts by weight of hydrophilic solvent A, 3 parts by weight of coloring pigment A, 3 parts by weight of coloring pigment B, 1 part by weight of coloring pigment C, 6 parts by weight of coloring pigment D, 3 parts by weight of fiber, 1 part by weight of dispersant, 26 parts by weight of thickener, 14 parts by weight of water, and 1 part by weight of antifoaming agent in a conventional manner.

[0099] As a result, a topcoat set consisting of topcoat material 13 and topcoat material 14 was obtained. The color difference between topcoat material 13 and topcoat material 14 was 16.

[0100] When topcoat materials 13 and 14 were used instead of topcoat materials 1 and 2 and a coating surface was formed in the same manner as in Example 1, cracks were observed on the coating surface.

[0101] (Comparative Example 2) · Manufacture of topcoat material 15 Topcoat material 15 (light gray, viscosity 51 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate A with 210 parts by weight of extender pigment A, 35 parts by weight of aqueous resin A (17.5 parts by weight of solids), 3 parts by weight of hydrophilic solvent B, 0.03 parts by weight of coloring pigment A, 0.03 parts by weight of coloring pigment B, 0.01 parts by weight of coloring pigment C, 11 parts by weight of coloring pigment D, 3 parts by weight of fiber, 1 part by weight of dispersant, 26 parts by weight of thickener, 14 parts by weight of water, and 1 part by weight of antifoaming agent in a conventional manner.

[0102] Manufacture of topcoat material 16 Topcoat material 16 (dark gray, viscosity 50 Pa·s) was produced by mixing and stirring 100 parts by weight of aggregate A with 210 parts by weight of extender pigment A, 35 parts by weight of aqueous resin A (17.5 parts by weight of solids), 3 parts by weight of hydrophilic solvent B, 3 parts by weight of coloring pigment A, 3 parts by weight of coloring pigment B, 1 part by weight of coloring pigment C, 6 parts by weight of coloring pigment D, 3 parts by weight of fiber, 1 part by weight of dispersant, 26 parts by weight of thickener, 14 parts by weight of water, and 1 part by weight of antifoaming agent in a conventional manner.

[0103] As a result, a topcoat set consisting of topcoat material 15 and topcoat material 16 was obtained. The color difference between topcoat material 15 and topcoat material 16 was 16.

[0104] When topcoat materials 15 and 16 were used instead of topcoat materials 1 and 2 and a coating surface was formed in the same manner as in Example 1, cracks were observed on the coating surface.

Claims

1. A coating forming method for forming a coating surface having a mixture of different color tones, For the coated surface, (1) A step of applying at least two types of water-based topcoat materials to form a coating surface; (2) supplying water and / or a hydrophilic solvent to the coating surface and leveling the coating surface using a pressing tool; (3) A step of drying the coated surface; This is what we do. The above-mentioned aqueous topcoat material contains 70 to 500 parts by weight of extender pigment, 3 to 30 parts by weight of aqueous resin, and 0.1 to 50 parts by weight of hydrophobic solvent, relative to 100 parts by weight of aggregate, A coating forming method characterized in that at least one of the above-mentioned aqueous topcoat materials further contains 1 to 100 parts by weight of a coloring pigment.

2. 2. The method for forming a coating according to claim 1, wherein the coating surface is formed using a trowel in the step (1).

3. 3. The method for forming a coating according to claim 1, wherein in step (2), the coating surface is leveled using a trowel.