Covering material

Abstract

This invention provides a coating material that can form a new, highly decorative coating film that differs from conventional products. [Solution] The coating material of the present invention is a coating material in which liquid or gel-like color particles are dispersed in an aqueous clear coating material, the coating material is a coating material for forming a color particle stretching pattern, and the aqueous clear coating material is characterized in that it contains powder particles with an average particle diameter of 200 μm or less and flaky powder particles with an average particle diameter of more than 200 μm.

Description

[Technical Field]

[0001] This invention relates to a novel coating material. [Background technology]

[0002] Traditionally, the walls of buildings and civil engineering structures have been coated with various coating materials for purposes such as surface protection and aesthetic improvement. Among these, coating materials in which liquid or gel-like color particles are dispersed in an aqueous medium are used in applications where high aesthetic appeal is required, as they can form a richly colored coating film.

[0003] In such coating materials, various methods have been considered to improve the aesthetic appearance of the resulting coating film. As an example, Patent Document 1 (Japanese Patent Application Publication No. 2006-326494) discloses a method in which a material in which gelled colored particles (color granules) are dispersed in water, i.e., a water-based multi-color coating, is applied to a coating substrate, and then the coating is finished by pulling and pressing it in a certain direction with a pressing tool (Claim 1, paragraphs 0008, 0019-0020, etc.). With this method, the color granules are crushed, and a large pattern can be formed. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2006-326494 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, the above-mentioned patent document aims to increase the size of the color particles and improve the opacity of the formed coating film, and the resulting pattern is limited to a spotted pattern.

[0006] This invention has been made in view of these points, and aims to provide a coating material that can form a new, highly decorative coating film different from conventional products. [Means for solving the problem]

[0007] To solve these problems, the inventors, after diligent research, conceived of a coating material in which liquid or gel-like color particles are dispersed in a specific aqueous clear coating material, and thus completed the present invention.

[0008] In other words, the present invention has the following features. 1. A coating material comprising liquid or gel-like color particles dispersed in a water-based clear coating material, The above coating material is a coating material for forming a color particle stretching pattern, The above water-based clear coating material is Powders and granules with an average particle size of 200 μm or less, Contains flake-like granular material with an average particle size exceeding 200 μm. A covering material characterized by the following features. 2. The above-mentioned granular material with an average particle diameter of 200 μm or less includes granular material with an average particle diameter of 1 μm or more and less than 15 μm, and granular material with an average particle diameter of 15 μm or more and 200 μm or less. The coating material according to 1., characterized by the features described above. 3. A method for forming a coating film, characterized by applying the coating material described in 1. or 2. to the surface to be coated, and then stretching the color particles using a pressing tool while the coating film of the coating material is still wet. [Effects of the Invention]

[0009] According to the coating material of the present invention, a new, highly decorative coating film can be formed that differs from conventional spotted patterns. [Modes for carrying out the invention]

[0010] The following describes embodiments for carrying out the present invention.

[0011] The coating material of the present invention is a coating material in which liquid or gel-like color particles (hereinafter also simply referred to as "color particles") are dispersed in an aqueous clear coating material, and is a coating material for forming a color particle stretching pattern, characterized in that the aqueous clear coating material contains powder particles with an average particle diameter of 200 μm or less, and flake-like powder particles with an average particle diameter of more than 200 μm.

[0012] The coating material of the present invention can form a new, highly decorative coating film that differs from conventional spotted patterns. Specifically, it can form patterns created by stretching color particles, i.e., stretched color particle patterns. According to the present invention, stretched color particle patterns (e.g., flowing patterns, streaky patterns, etc.) that differ from simple granular patterns are formed. Moreover, because the coating material of the present invention contains specific powders and granules, the workability when stretching the color particles can be improved, making it advantageous in terms of improving finish quality and other aspects.

[0013] Such coating materials can be used as materials specified in JIS K5667:2003 "Multicolor Pattern Paints". Such materials are classified into oil-in-water (O / W) type, water-in-water (W / W) type, etc., depending on the combination of color particles and medium (color particles / medium). The coating material of the present invention can preferably be of the water-in-water (W / W) type.

[0014] The coating material of the present invention uses an aqueous clear coating material containing powders with an average particle diameter of 200 μm or less and flaky powders with an average particle diameter of more than 200 μm as the aqueous medium. Such an aqueous clear coating material serves as a medium for color particles and can form a clear coating film, playing a role in fixing the color particles in the formed coating film. In the present invention, by including powders with an average particle diameter of 200 μm or less and flaky powders with an average particle diameter of more than 200 μm in the aqueous clear coating material, the workability when spreading the color particles can be improved, and it is also preferable in terms of improving the finish.

[0015] The water-based clear coating material can contain, as constituent components, a resin emulsion (a1), a powder (g1) with an average particle diameter of 200 μm or less, and a flaky powder (g2) with an average particle diameter exceeding 200 μm. The water-based clear coating material may be any material that can form a transparent coating film in which color particles are visually recognizable.

[0016] The resin emulsion (a1) (hereinafter also referred to as the “(a1) component”) acts as a binder for the coating film and can form a clear coating film. Examples of the (a1) component include an acrylic resin emulsion, a urethane resin emulsion, a vinyl acetate resin emulsion, an epoxy resin emulsion, a silicone resin emulsion, a fluororesin emulsion, an acrylic vinyl acetate resin emulsion, an acrylic urethane resin emulsion, an acrylic silicone resin emulsion, etc., and one or more of these can be used. Among these, in particular, an acrylic resin emulsion, an acrylic silicone resin emulsion, etc. are preferable.

[0017] The glass transition temperature (Tg) of the (a1) component is preferably 30°C or lower, and more preferably -10°C to 30°C. By the (a1) component having such a glass transition temperature, it becomes possible to form a coating film excellent in crack resistance, substrate followability, etc. When the glass transition temperature of the (a1) component is at or above the above lower limit, the stain resistance, etc. can be enhanced, and the aesthetic appearance of the coating film can be sufficiently maintained over a long period. The glass transition temperature can be determined by Fox's calculation formula. In the present invention, “α to β” is synonymous with “α or more and β or less”.

[0018] It is desirable that the solid content of the (a1) component is 5 to 50% by mass in the water-based clear coating material, and more preferably 15 to 45% by mass.

[0019] Examples of the powder particles (g1) with an average particle diameter of 200 μm or less in the aqueous clear coating material (hereinafter also referred to as the "(g1) component") include heavy calcium carbonate, calcite, light calcium carbonate, white carbon, talc, kaolin, clay, pottery clay, china clay, diatomaceous earth, barite powder, barium sulfate, precipitated barium sulfate, silica sand, silica powder, quartz powder, gravel, glass beads, resin beads, hollow glass beads, hollow resin beads, mica, sericite, plate-shaped kaolin, barium sulfate flakes, glass flakes, alumina flakes, shell pieces, metal pieces, rubber pieces, plastic pieces, wood pieces, etc., or crushed products such as rocks, glass, shells, sintered bodies, plastics, rubber, waste glass, etc. These may be those subjected to surface treatment or the like. These can be used singly or in combination of two or more. The mixing ratio of the (g1) component is preferably 3 to 200 parts by mass, more preferably 5 to 150 parts by mass, and still more preferably 10 to 120 parts by mass with respect to 100 parts by mass of the solid content of the (a1) component.

[0020] From the viewpoint of the clarity of the coating film, it is desirable that the (g1) component has a refractive index of 1.4 to 1.7. The refractive index can be measured using an Abbe refractometer. The average particle diameter of the (g1) component is the value of D50, that is, the value of the 50% integrated particle diameter based on volume (accumulation from the fine particle side), and can be measured using a laser diffraction particle size distribution measuring device.

[0021] In addition, in the aqueous clear coating material, as the (g1) component, powder particles (g11) with an average particle diameter of 1 μm or more and less than 15 μm (hereinafter also referred to as the "(g11) component") and powder particles (g12) with an average particle diameter of 15 μm or more and 200 μm or less (hereinafter also referred to as the "(g12) component") can be used. By using the (g11) component and the (g12) component with different average particle diameters as the (g1) component in the aqueous clear coating material, in addition to the above effects, the performance such as matting property, crack resistance, and substrate followability can be enhanced.

[0022] The average particle size of component (g11) is 1 μm or more and less than 15 μm, preferably 1 to 14 μm, more preferably 2 to 12 μm. The average particle size of component (g12) is 15 μm or more and 200 μm or less, preferably 16 to 100 μm, more preferably 18 to 80 μm.

[0023] The mixing ratio of component (g11) is preferably 0.5 to 80 parts by mass, more preferably 1 to 50 parts by mass, and even more preferably 2 to 30 parts by mass, per 100 parts by mass of the solid content of component (a1). The mixing ratio of component (g12) is preferably 3 to 100 parts by mass, more preferably 5 to 90 parts by mass, and even more preferably 10 to 80 parts by mass, per 100 parts by mass of the solid content of component (a1). Furthermore, the mass ratio of component (g11) to component (g12) {(g11):(g12)} is preferably 1:99 to 80:20, more preferably 2:98 to 50:50, and even more preferably 3:97 to 40:60. With such mixing ratios of component (g11) and component (g12), in addition to the above effects, performance such as matte finish, crack resistance, and substrate conformability can be sufficiently enhanced.

[0024] In water-based clear coatings, flake-like powder particles (g2) with an average particle size exceeding 200 μm (hereinafter also referred to as "(g2) component") have a flake-like particle shape. The inclusion of the (g2) component in water-based clear coatings improves workability when spreading the color particles and is also advantageous in terms of improving finish quality. This is particularly effective when the color particles contain the (h) component (especially the (h2) component) described below.

[0025] Examples of such (g2) components include inorganic fragments such as mica, sericite, clay, talc, plate-like kaolin, barium sulfate flakes, glass flakes, alumina flakes, shell fragments, and metal fragments, or rubber fragments, plastic fragments, and wood fragments. Other examples include substrate particles that have been surface-treated (for example, by coating (or adsorbing) colorants containing pigments or dyes onto the substrate particles, or by applying calcination treatment to the substrate particles). These can be used individually or in combination of two or more types.

[0026] (g2) The component is not particularly limited as long as its shape is flaky (thin flake-like), but the aspect ratio (ratio of "short diameter / thickness") is preferably 1.5 to 2000, more preferably 2 to 500, and even more preferably 3 to 100. The ratio of the short diameter to the long diameter (short diameter / long diameter) is preferably 0.3 to 1, more preferably 0.4 to 1, and even more preferably 0.5 to 1. The "short diameter," "long diameter," and "thickness" referred to here are calculated by placing the flaky powder material stably on a horizontal surface and observing it from above with a microscope, with the shortest part being the "short diameter," the longest part being the "long diameter," and the maximum height from the bottom surface being the "thickness."

[0027] The average particle size of such (g2) component is greater than 200 μm, preferably 212 to 4000 μm, more preferably 300 to 2800 μm, and particularly preferably 500 to 2000 μm. The average particle size of the (g2) component is the D50 value, which is determined by sieving using a metal mesh sieve as specified in JIS Z8801-1:2019. This average particle size D50 is the 50% cumulative particle size, which is the particle size that, when sieved, accumulates to 50% by mass (average value of mass distribution) from the finer particles.

[0028] The mixing ratio of (g2) is preferably 0.5 to 80 parts by mass, more preferably 1 to 45 parts by mass, and even more preferably 2 to 30 parts by mass, per 100 parts by mass of the solid content of component (a1). When the flake-shaped powder is mixed in such a ratio, the workability when stretching the colored particles and the finish after stretching the colored particles can be further improved.

[0029] In water-based clear coatings, components (g1) and (g2) are used in combination. This configuration is advantageous for improving workability when stretching the color particles and for improving the finish after stretching the color particles. These effects are thought to be achieved through a combination of factors, such as component (g1) suppressing the fusion of color particles and component (g2) improving dispersibility, and component (g2) affecting the ease of stretching the color particles.

[0030] In the present invention, the above effect can be further enhanced by using a particle with a perfectly spherical shape (hereinafter referred to as "perfectly spherical granules") as component (g1) (components (g11) and / or (g12)). Preferably, the perfectly spherical granules have a ratio of major axis to minor axis (major axis / minor axis) of 0.8 to 1.2 (preferably 0.9 to 1.1, more preferably 0.95 to 1.05). Various materials, both organic and inorganic, can be used as the material for the perfectly spherical granules, such as glass beads, resin beads, hollow glass beads, and hollow resin beads. These can be used individually or in combination of two or more. The mass ratio of the perfectly spherical granules to component (g2) (perfectly spherical granules: component (g2)) is preferably 95:5 to 20:80, more preferably 90:10 to 50:50. In the present invention, component (g11) and / or component (g12) may contain spherical granules, and it is desirable that at least component (g12) contains spherical granules.

[0031] In water-based clear coatings, known additives can be appropriately mixed in addition to the components described above. Examples of such additives include dispersion stabilizers, water-soluble resins, pigment dispersants, emulsifiers, thickeners, film-forming aids, leveling agents, coupling agents, wetting agents, plasticizers, antifreeze agents, pH adjusters, drying adjusters, preservatives, antifungal agents, antialgal agents, antibacterial agents, defoaming agents, adsorbents, deodorizers, ultraviolet absorbers, light stabilizers, antioxidants, catalysts, crosslinking agents, solvents, and water. Resin emulsions other than component (a1) can also be mixed in, as long as they do not significantly impair the effects of the present invention.

[0032] The ratio of water (including water that is a medium such as component (a1)) in the aqueous clear coating material is preferably 80 to 800 parts by mass, more preferably 100 to 600 parts by mass, and even more preferably 120 to 500 parts by mass, per 100 parts by mass of the solid content of component (a1).

[0033] In water-based clear coatings, a dispersion stabilizer may be included to stably disperse the color particles. The dispersion stabilizer can be selected according to the type of resin and colorant that make up the color particles. Specific examples of dispersion stabilizers include magnesium salts, calcium salts, barium salts, aluminum salts, sodium salts, potassium salts, borates, silicates, phosphates, etc. In addition, water-soluble polymers, clays, etc. can also be used as dispersion stabilizers. Such dispersion stabilizers can also be used as gelling agents. The mixing ratio of the dispersion stabilizer is preferably 0.1 to 20 parts by mass, more preferably 0.5 to 15 parts by mass, per 100 parts by mass of the solid content of component (a1).

[0034] Liquid or gel-like color particles in the coating material contribute to the formation of a highly decorative coating film. These color particles can be obtained, for example, by dispersing a coloring material containing an aqueous resin, a coloring pigment, and various additives as needed, in a liquid or gel-like state within an aqueous medium. The inclusion of an aqueous resin in the coloring material constituting the color particles allows the coating material to be a water-in-water (W / W) type. As the aqueous resin, a resin emulsion and / or a water-soluble resin can be used.

[0035] In the present invention, a resin emulsion (a2) can be used as the aqueous resin in the coloring agent. Examples of resin emulsions (a2) (hereinafter also referred to as "component (a2)") include acrylic resin emulsion, urethane resin emulsion, vinyl acetate resin emulsion, silicone resin emulsion, fluororesin emulsion, acrylic vinyl acetate resin emulsion, acrylic urethane resin emulsion, acrylic silicone resin emulsion, etc., and one or more of these can be used. Among these, acrylic resin emulsion and acrylic silicone resin emulsion are particularly preferred.

[0036] The glass transition temperature (Tg) of component (a2) is preferably -10 to 80°C, more preferably 10 to 60°C, and can also be set to a temperature higher than the glass transition temperature of component (a1).

[0037] (a2) The solid content of component (a2) is preferably 5 to 50% by mass, and more preferably 10 to 40% by mass, in the coloring agent.

[0038] The coloring agent constituting the color particles preferably comprises a water-soluble resin component (a2) and a water-soluble resin. Examples of water-soluble resins include polyvinyl alcohol, poly(meth)acrylic acid, polyethylene oxide, water-soluble urethane, biogum, galactomannan derivatives, alginic acid or its derivatives, cellulose derivatives, gelatin, casein, albumin, etc., or chemically modified versions thereof obtained by oxidation, methylation, carboxymethylation, hydroxyethylation, hydroxypropylation, sulfation, phosphorylation, cationization, etc. These can be used individually or in combination of two or more. Such water-soluble resins can contribute to the stabilization of color particle formation and can also be used as gel-forming agents. In the present invention, by including both of these in the coloring agent, color particles can be stably formed, and the weather resistance, water resistance, etc. of the coating film can be improved.

[0039] The ratio of component (a2) to water-soluble resin in the coloring agent is preferably 99.8:0.2 to 70:30, and more preferably 99.5:0.5 to 90:10, in terms of solid content mass ratio (solid content of component (a2): solid content of water-soluble resin).

[0040] In colorants, coloring pigments are components that impart color to color particles. Examples of coloring pigments include inorganic chromatic pigments such as ferric oxide (red iron oxide), yellow iron oxide, ultramarine, cobalt blue, and cobalt green; organic chromatic pigments such as azo, naphthol, pyrazolone, anthraquinone, perylene, quinacridone, disazo, isoindolinone, benzimidazole, phthalocyanine, and quinophthalone; black pigments such as carbon black, iron-manganese composite oxide, iron-copper-manganese composite oxide, iron-chromium-cobalt composite oxide, copper-chromium composite oxide, copper-manganese-chromium composite oxide, black iron oxide, iron-chromium composite oxide, manganese-bismuth composite oxide, and manganese-yttrium composite oxide; white pigments such as titanium dioxide, zinc oxide, and alumina; and other pigments such as pearl pigments, aluminum pigments, luminescent pigments, phosphorescent pigments, and fluorescent pigments. These can be used individually or in combination of two or more. The average particle size of the coloring pigment is preferably 10 μm or less, more preferably 1 μm or less, and even more preferably 0.01 to 0.9 μm. The average particle size of the coloring pigment is the D50 value measured using a laser diffraction particle size distribution analyzer, as described above.

[0041] The mixing ratio of the coloring pigment in the coloring material is preferably 1 to 100 parts by mass, more preferably 2 to 80 parts by mass, per 100 parts by mass of the solid content of component (a2).

[0042] The coloring material constituting the color particles may include, in addition to the above-mentioned component (a2) and coloring pigment, granular material (h) with an average particle size of 1 μm or more. This results in color particles containing granular material (h) with an average particle size of 1 μm or more. In the present invention, by including granular material (h) with an average particle size of 1 μm or more in the color particles of the coating material, the naturalness of the stretched pattern created by the color particles is enhanced, and the texture of the finished appearance can be improved. Specifically, the edges of the stretched color particles become blurred, making them easier to blend with the coated surface and enhancing the natural appearance.

[0043] As the powdery material (h) (hereinafter also referred to as "(h) component") with an average particle diameter of 1 μm or more in the colored particles, for example, extender pigments, aggregates, etc., can be used. Among these, examples of extender pigments include heavy calcium carbonate, light calcium carbonate, kaolin, clay, pottery clay, china clay, diatomaceous earth, hydrated fine silica, talc, barite powder, barium sulfate, precipitated barium sulfate, barium carbonate, magnesium carbonate, silica powder, aluminum hydroxide, resin beads, resin powder, etc. These can be used individually or in combination of two or more. The average particle diameter of the extender pigment contained in the colored particles is preferably 1 μm or more and less than 50 μm, more preferably 2 to 48 μm. The average particle diameter of the extender pigment is the D50 value measured using a laser diffraction particle size distribution analyzer, as described above.

[0044] Preferably, aggregates with an average particle size of 50 μm or more, more preferably 53 to 1000 μm, even more preferably 63 to 600 μm, and particularly preferably 75 to 300 μm can be used. Examples of such aggregates include marble, granite, serpentinite, fluorite, feldspar, limestone, silica, silica sand, crushed stone, mica, siliceous shale, and their crushed products, crushed ceramics, crushed glass, glass beads, crushed resin, resin beads, rubber granules, metal granules, shirasu balloons, glass balloons, perlite, pumice, hollow balloons, etc. Crushed seashells, coral, wood, charcoal, activated carbon, waste glass, etc., can also be used. Furthermore, aggregates whose surfaces have been colored by surface treatment with pigments, dyes, glazes, etc., can also be used. The average particle size of the aggregate is the D50 value, which is determined by sieving using a metal mesh sieve as specified in JIS Z8801-1:2019. This average particle size D50 is the 50% cumulative particle size, and refers to the particle size that, after sieving, accumulates to 50% by mass (average value of mass distribution) from the finer particles.

[0045] The color particles preferably contain powders with an average particle size of 1 μm or more and less than 50 μm (h1), and / or powders with an average particle size of 50 μm or more (h2). In the present invention, it is preferable that the color particles contain either one of these powders, and more preferably both. In this configuration, the ends of the stretched color particles become more naturally faded, which is advantageous in terms of improving aesthetic appeal. Furthermore, it is possible to improve the ability to prevent uneven gloss of the formed coating film. For example, the above-mentioned extender pigment can be used as the powders with an average particle size of 1 μm or more and less than 50 μm (h1), and the above-mentioned aggregate can be used as the powders with an average particle size of 50 μm or more (h2).

[0046] It is desirable that powder particles (h) with an average particle diameter of 1 μm or more be included in the colored particles in a ratio of preferably 2 to 50% by mass, more preferably 5 to 40% by mass, and even more preferably 8 to 30% by mass. Furthermore, the mass ratio {(h1 component):(h2 component)} of powder particles with an average particle diameter of 1 μm or more and less than 50 μm (h1) to powder particles with an average particle diameter of 50 μm or more (h2) is preferably 90:10 to 10:90, more preferably 80:20 to 20:80. When powder particles are included in such a ratio, the above effects can be enhanced and it is more preferable.

[0047] The mixing ratio of powders (h) with an average particle size of 1 μm or more in the coloring agent is preferably 10 to 500 parts by mass, more preferably 30 to 400 parts by mass, and even more preferably 50 to 300 parts by mass, per 100 parts by mass of the solid content of component (a2). Furthermore, the mass ratio {(h1) component:(h2) component} of powders (h1) with an average particle size of 1 μm or more and less than 50 μm and powders (h2) with an average particle size of 50 μm or more is preferably 90:10 to 10:90, and more preferably 80:20 to 20:80. When the powders are included in such a ratio, the above effects can be enhanced and it is more preferable.

[0048] In addition to the components mentioned above, the coloring agent may contain various additives. Examples of such additives include pigment dispersants, emulsifiers, thickeners, film-forming aids, leveling agents, coupling agents, wetting agents, plasticizers, antifreeze agents, pH adjusters, drying adjusters, preservatives, antifungal agents, antialgal agents, antibacterial agents, defoaming agents, fibers, gel-forming agents, adsorbents, deodorizers, UV absorbers, light stabilizers, antioxidants, catalysts, crosslinking agents, solvents, and water. It is also possible to mix in resin emulsions other than component (a2) as long as they do not significantly impair the effects of the present invention.

[0049] The ratio of water (including water used as a medium such as aqueous resin) in the coloring agent is preferably 80 to 800 parts by mass, more preferably 100 to 600 parts by mass, per 100 parts by mass of the solid content of component (a2).

[0050] The method for granulating the coloring agent is not particularly limited, and known methods can be used. For example, a method similar to the manufacturing method of materials specified in JIS K5667:2003 "Multicolor Pattern Paints" can be used. Specifically, for example, a method can be used in which the coloring agent is dispersed in a medium containing a dispersion stabilizer (some or all of the components of the aqueous clear coating material). The dispersion stabilizer is a component that stabilizes the coloring agent into granules, and acts as a gelling agent for the coloring agent, for example.

[0051] The particle size and shape of the color particles can be set as appropriate. Specifically, for example, the shape of the stirring blades during manufacturing, the size and position of the stirring blades relative to the stirring tank, the rotation speed of the stirring blades, the stirring time, the viscosity of the coloring agent, the method and concentration of adding the dispersion stabilizer, the viscosity of the medium, etc., can be appropriately selected and adjusted. The average particle size of the color particles is preferably 0.5 to 20 mm (more preferably 1 to 18 mm, and even more preferably 1.2 to 15 mm). In this invention, the average particle size of the color particles is obtained by drying the color particles on a standard white paper for 48 hours under standard conditions (temperature 23°C, relative humidity 50%; the same applies hereinafter) and calculating the average value of their major axis (average value of 50 color particles).

[0052] To obtain a coating material containing two or more types (two or more colors) of colored particles, for example, A method of preparing color particle dispersions (color particle dispersions containing one type of color particle) in which one type of coloring agent is dispersed in a medium, and then mixing them, or A method for obtaining a color particle dispersion (a color particle dispersion containing two or more color particles) by simultaneously or sequentially adding and dispersing two or more colorants with different color tones, etc., into a medium. Such methods can be employed. In such methods, part or all of the water-based clear coating material can be used as the medium. If a color particle dispersion is prepared using part of the water-based clear coating material as the medium, the remaining components of the water-based clear coating material can be mixed into the color particle dispersion.

[0053] In the coating material, the mass ratio of color particles to water-based clear coating material (color particles:water-based clear coating material) is preferably 1:99 to 80:20 (more preferably 10:90 to 75:25, and even more preferably 30:70 to 70:30).

[0054] The coating material of the present invention may contain a mixture of color particles that do not contain component (h), color particles that contain component (h), transparent gel particles, etc., as long as the effects of the present invention are not significantly impaired. When the coating material contains color particles that contain component (h), the proportion of color particles that contain component (h) among the total color particles in the coating material is preferably 50% by mass or more, more preferably 70% by mass or more, and even more preferably 90-100% by mass.

[0055] The coating material of the present invention can be applied by methods such as spraying, roller application, or brush application. In the present invention, the action of component (g1) improves workability when applying by spraying, roller, or brush. The amount of coating material applied is preferably 0.6 kg / m². 2 More preferably, 0.1 to 0.5 kg / m 2 More preferably 0.2 to 0.4 kg / m 2 The amount of coating material to be applied (in terms of solid content) is preferably 0.3 kg / m². 2 The following is more preferably 0.05~0.2 kg / m 2 More preferably 0.08 to 0.18 kg / m2 Therefore, by applying the coating material under these conditions, the aesthetic appeal of the color particle stretched pattern can be further enhanced. The coating or drying of the coating material may preferably be carried out at room temperature (preferably 0 to 50°C, more preferably 5 to 45°C).

[0056] When applying the coating material, the viscosity can be adjusted as appropriate by mixing in a diluent such as water. The dilution ratio is preferably 0 to 10% by mass. The viscosity of the coating material to be applied is preferably 1 to 30 Pa·s (more preferably 2 to 20 Pa·s), and the thixotropy index is preferably 2 to 9 (even more preferably 3 to 8).

[0057] <Surface to be coated> Examples of surfaces to be painted in this invention include interior and exterior surfaces of buildings, civil engineering structures, etc. (e.g., exterior walls, interior walls, ceilings, roofs, etc.). Examples of substrates constituting such surfaces to be painted include concrete, mortar, and plate-shaped substrates. Among these, examples of plate-shaped substrates include cement boards, extruded boards, slate boards, PC boards, ALC boards, fiber-reinforced cement boards, metal siding boards, ceramic siding boards, ceramic boards, calcium silicate boards, plastic boards, hard wood chip cement boards, PVC extruded siding boards, and plywood. When the surface to be painted is composed of multiple plate-shaped substrates, the joints between the plate-shaped substrates may be filled with jointing materials such as sealants and dry jointing materials.

[0058] The above-mentioned substrate may have an existing coating film. Such an existing coating film is formed, for example, by one or more types of coating agents. Various types of coating agents can be used, such as colored or uncolored, or opaque or transparent. Examples include those containing one or more resins selected from vinyl acetate resin, alkyd resin, epoxy resin, acrylic resin, urethane resin, acrylic silicone resin, silicone resin, fluororesin, etc. The existing coating film is one or more layers and may be, for example, an elastic type, a rigid type, etc.

[0059] In the present invention, the substrate can be coated with various coating materials to be used as the surface to be coated. Examples of such coating materials include undercoats and surface preparation coatings (e.g., sealers, primers, surfacers, fillers, putties, etc.), stone-like finishing coatings, and thin-coat and thick-coat finishing coatings specified in JIS A6909.

[0060] Among these, the stone-like finish coating material is a coating material capable of forming a coating film that exhibits color due to the color development of aggregates, and is a coating material in which resin components and colored aggregates are essential components. With the stone-like finish coating material, various colors can be imparted to the coating film by using one or more types of colored aggregates in appropriate combinations, and fine irregularities can also be given to the surface of the coating film. The finish can also be improved by using transparent aggregates as aggregates. The mixing ratio of aggregates is preferably 100 to 4000 parts by mass, more preferably 150 to 3000 parts by mass, and even more preferably 200 to 2000 parts by mass, per 100 parts by mass of the solid content of the resin component.

[0061] Thin-coat and thick-coat finish coatings specified in JIS A6909 can be obtained by uniformly mixing resin components, coloring pigments, extender pigments, aggregates, and other admixtures (dispersants, thickeners, defoamers, preservatives, etc.). With such coatings, the desired color can be imparted to the coating film by using one or more types of coloring pigments in combination. The mixing ratio of coloring pigments is preferably 1 to 300 parts by mass, more preferably 2 to 200 parts by mass, per 100 parts by mass of the solid content of the resin component. Extender pigments mainly act as fillers and are components that effectively contribute to the formation of thick coating films. The mixing ratio of extender pigments is preferably 10 to 1000 parts by mass, more preferably 20 to 500 parts by mass, per 100 parts by mass of the solid content of the resin component. Aggregates play a role in imparting fine irregularities to the surface of the coating film. The mixing ratio of the aggregate is preferably 10 to 2000 parts by mass, more preferably 30 to 1500 parts by mass, per 100 parts by mass of the solid content of the resin component.

[0062] In the painting of such coating materials, by appropriately selecting the type of painting tool and its usage method, various uneven patterns, such as sand wall-like, yuzu skin-like, fiber wall-like, ripple-like, stucco-like, uneven, moon surface-like, combed, worm-eaten-like patterns, etc., can be formed. As the painting tool, for example, spray, roller, trowel, brush, etc. can be used. At this time, by treating the painted surface with a design roller, trowel, brush, comb, spatula, etc. until the coating material dries, various uneven patterns can also be formed. Also, it is possible to form a multicolor pattern by combining two or more coating materials with different colors.

[0063] The coating amount of such coating materials depends on the type of pattern to be formed, etc., but is preferably 0.5 - 10 kg / m 2 and more preferably 1 - 8 kg / m 2 and even more preferably 1.5 - 6 kg / m 2 is. At the time of painting, a diluent such as water can be mixed to appropriately adjust the viscosity of the coating material. The dilution ratio is preferably 0 - 10 mass%. Drying can be carried out in an environment at normal temperature (preferably 0 - 50 °C, more preferably 5 - 45 °C).

[0064] <Stretching of color particles> The coating material of the present invention is a material for forming a pattern of stretching color particles (for example, a flowing pattern, a streaky pattern, etc.). In the present invention, after applying the coating material to the surface to be coated, while the coating film of the coating material is not dry, the color particles can be stretched using a pressing tool (stretching step). In the present invention, by this stretching step, a pattern of stretching color particles is formed on the surface to be coated, and a highly aesthetic finish can be obtained, and a new high-design coating film different from the conventional spot-like pattern can be formed.

[0065] In the stretching process, a pressing tool is brought into contact with the color particles, and the shape of the color particles is deformed and stretched by dragging while pressing, thereby forming flow patterns and the like. Examples of pressing tools that can be used in the stretching process include trowels, spatulas, brushes, brooms, etc. The stretching of the color particles can be performed while the coating material is still wet, preferably within 20 minutes after coating (more preferably within 10 minutes, and even more preferably within 5 minutes).

[0066] The degree of load on the pressing tool can be appropriately set within the range in which the color particles are crushed and can be stretched. By adjusting the load on the pressing tool, the length, width, thickness, etc. of the formed pattern can also be changed. The direction in which the color particles are stretched by the pressing tool can be set according to the desired pattern. For example, to form a linear pattern, the particles should be stretched straight in a certain direction. To form an arc-shaped pattern, the particles should be stretched in a semicircle. Random stretching is also possible. When the surface to be coated is a vertical surface such as a wall, it is desirable to stretch the particles horizontally. This method is preferable because it can suppress the falling of color particles, improve work efficiency, and enhance the finished design.

[0067] After spreading the color particles, the coating film is dried. Drying is preferably carried out at room temperature (preferably 0 to 50°C, more preferably 5 to 45°C).

[0068] In this invention, a highly decorative coating can be formed by this method. Furthermore, the application and stretching of the coating material may be repeated as long as it does not hinder the effects of the present invention. In this invention, after the coating material film has dried, a clear coating or the like may be applied as needed. [Examples]

[0069] Examples and comparative examples are shown below to further clarify the features of the present invention, but the present invention is not limited to these examples.

[0070] (Manufacturing of coating material 1) (1) In the colorant 1 with the formulation shown in Table 2, the coloring pigment is: Coloring pigment 1: Coloring pigment 3: Coloring pigment 4: Coloring pigment 5 Coloring agent 1-1 (white coloring agent) was obtained using a mixture of 1.960:0.004:0.004:0.032 (total 2 parts by mass). This coloring agent 1-1 (100 parts by mass) was added to mixture a of aqueous clear coating material 1 with the formulation shown in Table 1 and stirred to disperse. Then, mixture b of aqueous clear coating material 1 was added to obtain a white color particle dispersion liquid containing gel-like color particles (white) with an average particle size of approximately 3 mm. (2) In the colorant 1 with the formulation shown in Table 2, the coloring pigment is: Coloring pigment 1: Coloring pigment 2: Coloring pigment 3: Coloring pigment 4 Coloring agent 1-2 (gray coloring agent) was obtained using a ratio of 1.508:0.400:0.084:0.008 (total 2 parts by mass). This coloring agent 1-2 (100 parts by mass) was added to mixture a of aqueous clear coating material 1 with the formulation shown in Table 1 and stirred to disperse. Then, mixture b of aqueous clear coating material 1 was added to obtain a gray particle dispersion liquid containing gel-like colored particles (gray) with an average particle size of approximately 3 mm. (3) In the colorant 1 with the formulation shown in Table 2, the coloring pigment is: Coloring pigment 1: Coloring pigment 2: Coloring pigment 3: Coloring pigment 4 Coloring agent 1-3 (purple coloring agent) was obtained using a mixture of 1.000:0.764:0.016:0.220 (total 2 parts by mass). This coloring agent 1-3 (100 parts by mass) was added to mixture a of aqueous clear coating material 1 with the formulation shown in Table 1 and stirred to disperse. Then, mixture b of aqueous clear coating material 1 was added to obtain a purple color particle dispersion liquid containing gel-like color particles (purple) with an average particle size of approximately 3 mm. (4) Coating material 1 was manufactured by mixing the white granular dispersion, gray granular dispersion, and purple granular dispersion in a mass ratio of 55:40:5.

[0071] The following materials were used as raw materials in the manufacture of the coating material. • Resin 1: Acrylic silicone resin emulsion (glass transition temperature 20°C, solids content 40% by mass) • Resin 2: Acrylic silicone resin emulsion (glass transition temperature 38°C, solids content 40% by mass) • Resin 3: Acrylic resin emulsion (glass transition temperature 20°C, solids content 40% by mass) • Resin 4: Water-soluble resin (galactomannan derivative aqueous solution, solid content 3% by mass) • Dispersant: Anionic dispersant • Powder / Granule 1: Diatomaceous earth (average particle size 6 μm, refractive index 1.5) • Powder / Granule 2: Heavy calcium carbonate (average particle size 4 μm, refractive index 1.6) • Powder / Granule 3: Talc (average particle size 5 μm, refractive index 1.6) • Powder / granular material 4: Resin beads (perfectly spherical, average particle size 38 μm, refractive index 1.5) • Powder / Granule 5: Perlite (average particle size 125-150 μm) ·Powder 6: Silica sand (average particle size 150~180μm) • Granular material 7: Scale-like granular material (mica, average particle size 1000-1180 μm, aspect ratio 30) • Granular material 8: Scale-like granular material (mica, average particle size 1400-1700 μm, aspect ratio 42) • Coloring pigment 1: White pigment dispersion {Aqueous dispersion of titanium dioxide (average particle size 0.3 μm), solid content 60% by mass} • Coloring Pigment 2: Black Pigment Dispersion {Aqueous dispersion of black iron oxide (average particle size 0.8 μm), solid content 60% by mass} • Coloring Pigment 3: Yellow Pigment Dispersion {Aqueous dispersion of yellow iron oxide (average particle size 0.5 μm), solid content 50% by mass} • Coloring pigment 4: Red pigment dispersion {Aqueous dispersion of reddish-brown pigment (average particle size 0.2 μm), solid content 60% by mass} • Coloring Pigment 5: Blue Pigment Dispersion {Aqueous dispersion of cobalt blue (average particle size 0.4 μm), solid content 50% by mass} • Film-forming aids: Ester-based film-forming aids, ether-based film-forming aids • Dispersion stabilizer: 5% by mass aqueous solution of gelling agent • Thickener: Urethane-based thickener • Additives: Preservatives, fungicides, algaecides, light stabilizers • Defoaming agent: Silicone-based defoaming agent

[0072] [Table 1]

[0073] [Table 2]

[0074] (Manufacturing of coating materials 2-15) Instead of coloring agent 1 and water-based clear coating agent 1, white granular dispersion, gray granular dispersion, and purple granular dispersion were prepared using the combinations of coloring agent and water-based clear coating agent shown in Tables 3 and 4, respectively. Coating materials 2 to 15 were then prepared by mixing these in a mass ratio of 55:40:5.

[0075] (Test method) The tests were conducted using the following method, and evaluations 1-3 were performed. Painting and drying were all carried out under standard conditions (temperature 23°C, relative humidity 50%).

[0076] Slate boards (900mm x 900mm x 3mm) that had been pre-treated with a sealer were installed vertically. A stone-like finish coating was applied to these slate boards using a spray gun at a rate of 3kg / m². 2 After painting, a pattern was immediately applied using a trowel, and the surface was dried for 24 hours to form a coating with a textured surface. Next, the coating amount, calculated based on solid content, was 0.13 kg / m². 2 After spray-painting the coating material in the manner described above, the pressing tool was immediately brought into contact with the color particles, and the material was stretched horizontally while applying constant pressure, and then allowed to dry and cure for 7 days. Test plates were obtained using the above method. The types of coating materials and pressing tools used in the test are shown in Tables 3 and 4.

[0077] (Rating 1) Evaluation 1 assessed the workability when stretching the color particles. Of the methods described above, those where the color particles were stretched a relatively long distance were rated "AA", and those where the stretched distance was relatively short were rated "C", on a four-point scale (Excellent: AA > A > B > C: Poor).

[0078] (Rating 2) In Evaluation 2, the aesthetic appeal of the flow pattern formed by the stretching process was evaluated. The appearance of the test panels obtained by the above method was visually observed, and those with a blurred edge to the flow pattern and a texture that blended well with the main coating were rated "AA," while those with a straight edge to the flow pattern and a large difference in texture from the main coating were rated "C." This was evaluated on a four-point scale (Excellent: AA > A > B > C: Poor).

[0079] (Rating 3) In Evaluation 3, the state of gloss unevenness was evaluated. With light shining from the right side of the test plate obtained using the method described above, the appearance of the test plate was visually observed from the left front. At this time, a three-level evaluation (Excellent: A > B > C: Poor) was used, with "A" indicating suppressed gloss unevenness and "C" indicating gloss unevenness.

[0080] Next, for Examples 1-12, which received favorable evaluations 1-3, evaluation 4 was performed.

[0081] (Rating 4) The test plates obtained using the above method were cut to 100 mm x 300 mm and subjected to a total of 10 cycles of repeated hot and cold tests, each consisting of 18 hours of water immersion, 3 hours of standing at -20°C, and 3 hours of standing at 50°C. After these cycles, the appearance of the coating was checked and the state of crack formation was evaluated. The evaluation was performed on a three-tiered scale (Excellent: A > B > C: Poor), with "A" indicating no crack formation and "C" indicating clear crack formation.

[0082] (Test results) The test results are shown in Tables 3 and 4. In Examples 1 to 12, favorable results were obtained in each evaluation.

[0083] [Table 3]

[0084] [Table 4]

Claims

1. A coating material comprising liquid or gel-like color particles dispersed in a water-based clear coating material, The above coating material is a coating material for forming a color particle stretching pattern, The above water-based clear coating material is Powders and granules with an average particle size of 200 μm or less, Contains flake-like granular material with an average particle size exceeding 200 μm. A covering material characterized by the following features.

2. The above-mentioned granular material with an average particle diameter of 200 μm or less includes granular material with an average particle diameter of 1 μm or more and less than 15 μm, and granular material with an average particle diameter of 15 μm or more and 200 μm or less. The coating material according to claim 1, characterized in that it is as described above.

3. A method for forming a coating film, characterized by applying the coating material described in claim 1 or 2 to a surface to be coated, and then stretching the color particles using a pressing tool while the coating film of the coating material is still wet.

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