Coating material and film forming method

Abstract

To provide a formed film which has a large pattern, prevents deviation of scaly particles, imparts designability with good balance (arrangement) of a pattern, is little in rough feeling and is excellent in appearance.SOLUTION: A coating material contains a resin component (A) and scaly particles (B). The coating material contains 5-200 pts.wt. of scaly particles (B) with respect to 100 pts.wt. of a solid content of the resin component (A), and the scaly particles (B) contain large particles (b1) having a minor axis of more than 2 mm, middle particles (b2) having a minor axis of more than 0.7 mm and 2 mm or less, and small particles (b3) having a minor axis of 0.7 mm or less.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a novel coating material.

Background Art

[0002] Conventionally, there has been known a decorative finishing method for imparting the aesthetic appearance of natural stone to buildings and civil engineering structures. In recent years, there has been an increasing number of cases where a decorative finish having design properties such as various colors peculiar to natural stone is desired. As such a method, for example, Patent Document 1 describes a method of applying a coating material containing colored mica and a binder resin.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the above Patent Document 1 uses relatively small-sized colored mica having an average particle diameter of 0.3 to 2 mm, and it is difficult to obtain a large-scale design. In order to obtain a large-scale design, it is conceivable to use large particle mica pieces exceeding 2 mm. However, when a coating material containing such large particles is applied, the scaly particles are likely to partially overlap (densify) with each other, resulting in a bias in the pattern. On the other hand, there may be a portion (gap) where there are few scaly particles, and there is a risk of forming a non-uniform pattern. In addition, the ends of the scaly particles may bounce up, and the formed film may have a rough feeling. Under such circumstances, there is a need for a coating material and a film forming method that can form a film with excellent aesthetics without bias in the pattern of the scaly particles by a simple method.

Means for Solving the Problems

[0005] As a result of intensive studies to solve the above problems, the present inventor has conceived that, in a coating material containing a resin component and scaly particles, by adopting a coating material containing scaly particles having a specific particle diameter, a large-scale pattern can be obtained, and the scaly particles are less likely to be biased, and a design property with a good balance (arrangement) of the pattern is imparted, and a formed film excellent in aesthetic property with less roughness can be easily obtained, leading to the completion of the present invention. That is, the present invention has the following features.

[0006] That is, the present invention has the following features. 1. A coating material containing a resin component (A) and scaly particles (B), wherein the coating material contains 5 to 200 parts by weight of scaly particles (B) with respect to 100 parts by weight of the solid content of the resin component (A), the scaly particles (B) include large particles (b1) having a minor diameter of more than 2 mm, medium particles (b2) having a minor diameter of more than 0.7 mm and 2 mm or less, and small particles (b3) having a minor diameter of 0.7 mm or less, the medium particles (b2) are visually recognized as a base pattern of the formed film, The weight ratio (b2) / (b3) of the above medium particles (b2) to small particles (b3) is between 2 and 10. the coating material is characterized in that the mixing ratio of the granular aggregate is 50 parts by weight or less with respect to 100 parts by weight of the solid content of the resin component (A). 2. The coating according to claim 1, wherein the scaly particles (B) have a weight ratio [(b2)+(b3)] / (b1) of the medium particles (b2) and small particles (b3) to the large particles (b1) of 1 or more and 50 or less. 3. The coating material according to 1, wherein the scaly particles contain at least two or more colors of particles. 4. A film forming method, wherein the coating material according to 1 is applied onto a substrate to form a film. 5. A film forming method, wherein a primer is applied onto a substrate to form a colored film, and then the coating material according to 1 is applied to form a film. 6. The film forming method according to 5, wherein the color tone of the colored film is set to a hue approximated to the medium particles (b2) of the component (B). <000011​​

[0007] According to the present invention, it is possible to obtain a formed coating that has a large pattern, is less prone to uneven distribution of scale-like particles, provides a good design with a balanced (arranged) pattern, and has excellent aesthetics with less roughness. [Modes for carrying out the invention]

[0008] The following describes embodiments for carrying out the present invention.

[0009] <Coating material> The coating material of the present invention is characterized by containing in combination a resin component (A) and flake-like particles (B) having a specific size.

[0010] The resin component (A) (hereinafter referred to as "component (A)") is not particularly limited, but one or more selected from water-soluble resins and water-dispersible resins are preferred. Examples of resin types include 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 individually or in combination of two or more. Furthermore, these components (A) may have crosslinking reactivity. When a component (A) with crosslinking reactivity is used, the water resistance, weather resistance, chemical resistance, etc. of the coating can be improved.

[0011] In the present invention, acrylic resin is particularly preferred as component (A). Acrylic resin is a resin whose main component is alkyl (meth)acrylate, copolymerized with other monomers or other polymerizable monomers as needed. In the present invention, alkyl acrylate and alkyl methacrylate are collectively referred to as alkyl (meth)acrylate. Furthermore, monomer is a general term for compounds having polymerizable unsaturated double bonds.

[0012] Examples of alkyl (meth)acrylates include methyl (meth)acrylate, ethyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, n-hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, octyl (meth)acrylate, cyclohexyl (meth)acrylate, etc., and one or more of these can be used.

[0013] Other specific examples of monomers include, for example, Aromatic monomers such as styrene, 2-methylstyrene, vinyltoluene, t-butylstyrene, chlorostyrene, vinylanisole, vinylnaphthalene, divinylbenzene, phenyl(meth)acrylate, and benzyl(meth)acrylate; Nitrile group-containing monomers such as (meth)acrylonitrile, vinylidene cyanide, and α-cyanoethyl (meth)acrylate; Amide group-containing monomers such as maleic acid amide, (meth)acrylamide, N-monoalkyl(meth)acrylamide, N,N-dialkyl(meth)acrylamide, 2-(dimethylamino)ethyl (methacrylate), N-[3-(dimethylamino)propyl](meth)acrylamide, and vinylamide; Carbonyl group-containing monomers such as acrolein, diacetone (meth)acrylamide, vinyl methyl ketone, vinyl ethyl ketone, and vinyl butyl ketone;

[0014] Carboxyl group-containing monomers such as (meth)acrylic acid, crotonic acid, maleic acid, itaconic acid, fumaric acid, isocrotonic acid, and salicylic acid; Amino group-containing monomers such as aminomethyl acrylate, aminoethyl acrylate, aminopropyl (meth)acrylate, amino-n-butyl (meth)acrylate, butylvinylbenzylamine, vinylphenylamine, p-aminostyrene, N-methylaminoethyl (meth)acrylate, and Nt-butylaminoethyl (meth)acrylate; Epoxy group-containing monomers such as glycidyl (meth)acrylate, diglycidyl fumarate, 3,4-epoxycyclohexyl (meth)acrylate, 3,4-epoxyvinylcyclohexane, allyl glycidyl ether, ε-caprolactone-modified glycidyl (meth)acrylate, and β-methylglycidyl (meth)acrylate; Hydroxyl group-containing monomers such as hydroxypropyl (meth)acrylate, ethylene glycol mono(meth)acrylate, and glycerol mono(meth)acrylate; vinylidene halogenated monomers such as vinylidene fluoride; Alkoxysilyl group-containing monomers such as vinyltrimethoxysilane, vinyltriethoxysilane, γ-(meth)acryloyloxypropyltrimethoxysilane, γ-(meth)acryloyloxypropyltriethoxysilane, and γ-(meth)acryloyloxypropylmethyldimethoxysilane; Examples include ethylene, propylene, isoprene, butadiene, vinyl ether, vinyl ketone, etc. These can be used individually or in combination of two or more.

[0015] Component (A) can be produced by emulsion polymerization of a group of monomers obtained by appropriately mixing the above monomers. Any known polymerization method may be used, and in addition to ordinary emulsion polymerization, soap-free emulsion polymerization, feed emulsion polymerization, seed emulsion polymerization, etc., can also be used. During polymerization, emulsifiers, initiators, dispersants, polymerization inhibitors, polymerization inhibitors, buffers, chain transfer agents, etc., can be used.

[0016] Various surfactants suitable for emulsion polymerization can be used as emulsifiers, and these may be reactive types (reactive surfactants) having polymerizable unsaturated double bonds. Preferably, anionic surfactants and nonionic surfactants can be used as emulsifiers, either alone or in combination.

[0017] The glass transition temperature (hereinafter simply referred to as "Tg") of component (A) above is preferably set to -50°C to 50°C. If Tg is within this range, the effects of the present invention can be stably obtained. In this invention, Tg is a value obtained by Fox's formula. Furthermore, the average particle diameter of component (A) above is preferably 300 nm or less (more preferably 20 to 200 nm). If the average particle diameter is within this range, the water resistance, weather resistance, chemical resistance, etc. of the coating can be improved. The average particle diameter referred to here is a value measured by dynamic light scattering.

[0018] The flake-like particles (B) (hereinafter referred to as "component (B)") impart excellent design to the formed coating. Furthermore, component (B) is advantageous for thinning and lightening the formed coating. In this invention, the present invention is characterized by containing 5 to 200 parts by weight (preferably 10 to 100 parts by weight, more preferably 15 to 80 parts by weight) of flake-like particles (B) per 100 parts by weight of solid content of resin component (A). When the above range is satisfied, a coating with design properties such as natural stone can be obtained.

[0019] The present invention is characterized in that the above-mentioned (B) component includes large particles (b1) with a short diameter of more than 2 mm (hereinafter referred to as "large particles (b1)"), medium particles (b2) with a short diameter of more than 0.7 mm and less than or equal to 2 mm (hereinafter referred to as "medium particles (b2)"), and small particles (b3) with a short diameter of 0.7 mm or less (hereinafter referred to as "small particles (b3)"). By using (B) components of different sizes in combination in this way, uneven distribution of flake-like particles is less likely to occur, resulting in a well-balanced (arranged) pattern, a smooth texture, and a highly aesthetically pleasing film, and allowing for the creation of decorative elements such as large patterns. Specifically, the above-mentioned large particles (b1) are mainly used to effectively create large patterns on the formed film. The above-mentioned medium particles (b2) are mainly used to create a base pattern on the formed film. Furthermore, the small particles (b3) described above are components that impart a small design to the formed film and fill the gaps between the flake-like particles, thereby providing the film with opacity and other properties.

[0020] In the present invention, it is preferable to use the large particles (b1), medium particles (b2), and small particles (b3) in a specific weight ratio, and it is preferable that the weight ratio of the medium particles (b2) and small particles (b3) to the large particle (b1) [(b2) + (b3)] / (b1) is 1 or more and 50 or less (more preferably 3 or more and 40 or less, and even more preferably 5 or more and 30 or less). When this range is satisfied, the large particles (b1) are less likely to be unevenly distributed, and a film with excellent aesthetics can be formed in which the large pattern formed by the large particles (b1) is well-balanced (arranged) within the base pattern formed by the medium particles (b2) and small particles (b3). Furthermore, the medium particles (b2) and small particles (b3) can suppress the edge curling of the large particles (b1), and a flat film with less roughness can be formed. Furthermore, it is preferable that the weight ratio (b2) / (b3) of the medium particles (b2) to the small particles (b3) is 1 or more and 30 or less (more preferably 1.5 or more and 20 or less, and even more preferably 2 or more and 10 or less). When this range is met, the above effects can be further enhanced.

[0021] The mechanism by which such effects are achieved is not limited, but for example, medium-sized particles (b2) and small particles (b3), which are smaller than large particles (b1), act as spacers for large particles (b1), contributing to the dispersibility of large particles (b1). Similarly, small particles (b3), which are smaller than medium particles (b2), act as spacers for medium particles (b2), contributing to the dispersibility of medium particles (b2). As a result, it is presumed that the (B) component dispersed in the coating material can maintain good dispersibility for large particles (b1), medium particles (b2), and small particles (b3). In particular, in a coating material containing a relatively large amount of medium particles (b2), such as the coating material of the present invention, it is presumed that large particles (b1) and small particles (b3) are dispersed in a well-balanced manner among the medium particles (b2). By coating with such a material, it is presumed that the particles are less likely to become unevenly distributed, a coating with a well-balanced pattern is formed, and the bouncing of particle edges can be suppressed.

[0022] In this invention, the "minor axis" is calculated by sieving using a metal mesh sieve (standard sieve) as specified in JIS Z8801-1:2000, and the length of the diagonal (L=√2a) of the mesh opening (a) of the standard sieve is defined as the minor axis. Specifically, 100g of component (B) of the present invention is weighed and sieved for 10 minutes using a test method (manual sieving) in accordance with JIS K 0069. • Those that do not pass through a 12-mesh sieve (a=1.4mm, L=2.0mm) are classified as large particles (b1). - Grains that pass through a 12-mesh sieve (a=1.4mm, L=2.0mm) but not a 30-mesh sieve (a=0.5mm, L=0.7mm) are classified as medium-sized particles (b2). • Small particles (b3) are those that pass through a 30-mesh sieve (a=0.5mm, L=0.7mm). Let's assume that. The upper limit for large particles (b1) is preferably those that pass through a 6.5 mesh sieve (a=2.8 mm, L=4.0 mm) (particles with a short diameter of 4 mm or less). On the other hand, the lower limit for small particles (b3) is preferably those that do not pass through a 70 mesh sieve (a=0.21 mm, L=0.3 mm) (particles with a short diameter of more than 0.3 mm).

[0023] Furthermore, it is preferable that the ratio of the minor axis to the major axis (minor axis / major axis) of component (B) is 0.3 to 1 (more preferably 0.4 to 1, and even more preferably 0.5 to 1). When the size of component (B) satisfies the above range, its shape is easily recognizable and suitable as a design. The "minor axis / major axis" is calculated by placing component (B) stably on a horizontal surface, observing it from above with a microscope, and determining the length of the shortest part as the "minor axis" and the length of the longest part as the "major axis".

[0024] Furthermore, the thickness of component (B) is preferably 1 mm or less (more preferably 0.001 to 0.5 mm, and even more preferably 0.005 to 0.2 mm). In the present invention, it is preferable that component (B) has an aspect ratio (ratio of "minor axis / thickness") of 1.5 or more (more preferably 2 or more, and even more preferably 3 or more). The "thickness" referred to herein is the maximum height from the bottom surface when the particles are stably placed on a horizontal surface, and can be measured with an optical microscope or the like.

[0025] In component (B) of the present invention, the thickness of each of the large particles (b1), medium particles (b2), and small particles (b3) is not particularly limited as long as it satisfies the above range, but in the present invention, it is particularly preferable that the thickness of each particle is approximately the same. That is, component (B) of the present invention preferably contains a mixture of particles with different aspect ratios, and preferably contains at least two (more preferably three or more) particles with different aspect ratios. This can further enhance the effects of the present invention. Specifically, the aspect ratio of the large particles (b1) is preferably 5 to 2000 (more preferably 6 to 1500, even more preferably 7 to 1000), the aspect ratio of the medium particles (b2) is preferably 3 to 1000 (more preferably 4 to 800, even more preferably 5 to 500), and the aspect ratio of the small particles (b3) is preferably 1.5 to 500 (more preferably 2 to 300, even more preferably 2.5 to 200). Furthermore, it is preferable that the aspect ratios of the large particles (b1), medium particles (b2), and small particles (b3) are all different. By using components (B) with different aspect ratios in this way, uneven distribution of flake-like particles is less likely to occur, and a more stable formation of a coating with a good balance (arrangement) of patterns, less roughness, and superior aesthetics can be achieved.

[0026] Examples of such component (B) include mica, sericite, clay, talc, plate-like kaolin, barium sulfate flakes, glass flakes, alumina flakes, shell fragments, metal fragments and other inorganic fragments, or rubber fragments, plastic fragments, wood fragments, etc. Also, these can be used as base particles and colored (flak-like colored particles). The coloring treatment is not particularly limited, but examples include coating (or adsorbing) a coloring agent containing pigments or dyes onto the base particles, or applying a firing treatment to the base particles. In the present invention, it is preferable to use mica coated with a coloring agent (colored mica). Component (B) can be used in combination of one or more types (one or more colors) to express a variety of colors.

[0027] In the present invention, component (B) preferably contains flake-shaped colored particles, particularly colored mica. In particular, it is preferable that the large particles (b1) contain flake-shaped colored particles, which makes the large pattern more visible and enhances the aesthetic appeal. Furthermore, it is preferable that the large particles (b1), medium particles (b2), and small particles (b3) each contain flake-shaped colored particles, which allows for the formation of a coating with a large pattern and various colors.

[0028] The hue of component (B) of the present invention can be set by a desired pattern (design). For example, (p) an embodiment in which the above component (B) contains only single-color (one-color) particles, (q) an embodiment in which the above component (B) includes particles of at least two colors (more preferably two to six colors) selected from the same color system. (r) an embodiment in which the above component (B) contains particles of different colors, at least two or more colors (more preferably two to six colors), These are some examples. In the cases of embodiments (p) and (q) above, a coating with a calm and understated design can be obtained. On the other hand, in the case of embodiment (r) above, a coating with a diverse range of colors (accent design) can be obtained.

[0029] In the embodiments of (q) and (r) described above, the large particles (b1), medium particles (b2), and small particles (b3) can each contain particles of one or more colors. This can enhance the aesthetic appeal.

[0030] In particular, in the embodiment of (r) above, it is preferable that the large particles (b1) and the medium particles (b2) include particles of different colors. This allows the large accent design to be effectively visible, and an aesthetically pleasing coating can be easily formed. Furthermore, it is preferable that the small particles (b3) include particles of the same color as the large particles (b1) or the medium particles (b2) (more preferably the medium particles (b2)). This gives the formed coating a sense of depth, further enhancing its aesthetic appeal.

[0031] Furthermore, if the large particles (b1) contain two or more particles of different colors, the sense of diversity and other factors are improved, further enhancing the aesthetic appeal. In addition, for the medium particles (b2) to contain two or more particles of different colors, it is preferable to include 50% by weight or more (more preferably 55% by weight or more) of medium particles (b2') that form the base pattern (base color) of the formed film in the medium particles (b2). The medium particles (b2') may also contain two or more particles of a single color (only one color) or of the same color system (similar or similar colors). This makes the accent design created by the large particles (b1) more visible, further enhancing the aesthetic appeal. If the small particles (b3) contain two or more particles of different colors, it is preferable to include 60% by weight or more (more preferably 65% ​​by weight or more) of small particles (b3') that form the base pattern (base color) of the formed film of the same color system as the hollow particles (b2') in the small particles (b3).

[0032] In the above (B) component, similar colors (approximate colors / similar colors) refer to those with a color difference (△E) of preferably less than 10 (more preferably 8 or less). Different colors refer to those with a color difference (△E) of preferably 10 or more (more preferably 15 or more). The color difference (△E) referred to here is a value measured using a colorimeter, and each L * value, a * value, b *It can be calculated by the following formula from the value. <Formula> ΔE = {(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 are respectively the L * , a * , b * of the first color of the (B) component. L *2 , a *2 , b *2 are respectively the L * , a * , b * of the second color of the (B) component. Note that the L * value, a * value, b * value of the (B) component can be calculated by placing the (B) component on the glass plate until the glass surface is hidden and measuring the surface covered with the PE film thereon.

[0033] The coating material of the present invention can be produced by uniformly mixing the above components by a known method, but if necessary, other components that can be used in ordinary coating materials can also be mixed. Examples of such components include aggregates, coloring pigments, extender pigments, brightening pigments, fibers, film-forming aids, thickeners, leveling agents, plasticizers, antifreezing agents, pH adjusters, preservatives, fungicides, algicides, antibacterial agents, dispersants, defoamers, ultraviolet absorbers, light stabilizers, antioxidants, water, and the like.

[0034] When the coating material of the present invention contains granular aggregate, granular accent patterns can be added to the flat pattern formed by component (B) above. As aggregate, materials with a different shape from component (B) above and in granular form can be used, for example, either organic aggregate or inorganic aggregate can be used, and either transparent (translucent) aggregate or colored aggregate can be used. Examples of such aggregates include crushed natural stone, ceramic powder, metal granules, silica sand, feldspar, silica, crushed stone, glass beads, rubber granules, resin beads, etc., and these may be colored. Aggregates of the same hue as component (B) above can also be used. The particle size of the colored aggregate is 0.01 mm to 5 mm (more preferably 0.03 mm to 4.5 mm). When aggregate is included, it is preferably 50 parts by weight or less (more preferably 0 to 30 parts by weight) relative to component (A) above. In this range, granular accent patterns can be added in a well-balanced manner to the flat pattern formed by component (B) above.

[0035] Furthermore, if a luminous pigment is included, a sense of brightness can be imparted to the pattern formed by component (B). Examples of luminous pigments include pearl pigments, aluminum pigments, and metallic pigments. The particle size of the luminous pigment is preferably 0.5 to 100 μm (more preferably 1 to 80 μm).

[0036] Furthermore, as described above, the coating material of the present invention ensures the dispersibility of component (B) by including large particles (b1), medium particles (b2), and small particles (b3) in combination as component (B). As a result, good dispersibility can be obtained even when less dispersant is added compared to conventional coating materials (preferably 0.1% by weight or less in the coating material, more preferably no dispersant is added). This allows for excellent effects in terms of the water resistance of the formed film.

[0037] <Film formation method> The coating material of the present invention is applied to a substrate to form a film. The base material constitutes the surface of buildings, civil engineering structures, etc. Examples of such base materials include concrete, mortar, siding boards, extruded boards, gypsum boards, perlite boards, plywood, bricks, plastic sheets, metal sheets, glass, and porcelain tiles. These base materials may already have a coating formed on their surface or may have wallpaper attached to them. Furthermore, the surface of the base material may have a textured pattern such as joint patterns or a stone-like pattern.

[0038] The coating material of the present invention can form a film by application using, for example, a brush, trowel, roller, or spray, but it is particularly preferable to form the film by spray painting. This makes it less likely for the scale-like particles (B) to be unevenly distributed, resulting in a well-balanced (arranged) pattern and a flat, aesthetically pleasing film with minimal roughness that can be easily formed. In particular, it is possible to easily form highly aesthetic designs such as those resembling natural stone.

[0039] The amount of coating material of the present invention applied is not particularly limited, but is preferably 100 to 1000 g / m². 2 (more preferably 200-800 g / m²) 2 Furthermore, the number of coats can be set by forming the desired design, but is preferably 1 to 2 times (more preferably 2 times). In such cases, the effects of the present invention can be fully demonstrated.

[0040] Furthermore, in the present invention, it is preferable to apply a primer to the surface of the substrate to form a colored film, and then apply the coating material. As the primer for forming the colored film, one containing resin and pigment can be used. In the present invention, the color, gloss, etc. can be set by adjusting the type of pigment, the mixing ratio, etc. The mixing ratio of resin and pigment is preferably 5 to 500 parts by weight (more preferably 20 to 400 parts by weight, and even more preferably 30 to 300 parts by weight) of pigment per 100 parts by weight of resin solids.

[0041] In the present invention, it is preferable to set the color tone of the colored coating to a hue (co-color) that approximates the medium particle (b2) of component (B) above. This prevents unevenness in the formed coating. Furthermore, the formed coating can provide a greater sense of depth and other features, making it possible to form a multi-layer coating with excellent aesthetics.

[0042] It is desirable to set the color tone of the colored coating such that the color difference (△E) between the color tone of the medium particle (b2') which forms the base pattern (base color) in the medium particle (b2) is 20 or less (preferably 15 or less, more preferably 10 or less). In this case, a laminated coating with excellent aesthetics can be obtained. Note that the color difference (△E) referred to here is a value measured using a colorimeter, and each L * value, a * value, b * The value can be calculated using the following formula. <Formula>△E={(L *1 -L *2 ) 2 +(a *1 -a *2 ) 2 +(b *1 -b *2 ) 2} 0.5 During the ceremony, L *1 a *1 , b *1 Each of these represents the L of the colored coating. * a * , b * . L *2 a *2 , b *2 These are the L values ​​of the intermediate particle (b2') * a * , b * . Note that L*, a*, and b* of the base layer above are the values ​​of the film when the respective first coating material is applied to standard white paper using a film applicator with a 2 mm gap, and the coated surface is placed horizontally and dried for 48 hours under standard conditions (temperature 23°C, relative humidity 50%; the same applies below). * value, a * value, b *It can be calculated from the value (average of three or more measurement points). Also, the L of the medium particle (b2') * value, a * value, b * The value can be calculated by placing medium-sized particles (b2) on a glass plate until the glass surface is completely obscured, and then measuring the surface covered with a PE film.

[0043] As for the resin, the same material as the coating material described above can be used. Known coloring pigments, extender pigments, etc., can be used as pigments. Examples of coloring pigments include titanium dioxide, zinc oxide, carbon black, lamp black, bone black, graphite, black iron oxide, copper chromium black, cobalt black, copper manganese iron black, red iron oxide, molybdate orange, permanent red, permanent carmine, anthraquinone red, perylene red, quinacridone red, yellow iron oxide, titanium yellow, first yellow, benzoimidazolone yellow, chromium green, cobalt green, phthalocyanine green, ultramarine, Prussian blue, cobalt blue, phthalocyanine blue, quinacridone violet, dioxazine violet, heat-shielding pigments, aluminum flake pigments, pearl pigments, and luminous pigments. Any hue can be achieved by using one or more of these coloring pigments.

[0044] Examples of extender pigments include heavy calcium carbonate, granite, light calcium carbonate, white carbon, kaolin, clay, earthenware clay, china clay, diatomaceous earth, barite powder, barium sulfate, precipitated barium sulfate, silica sand, silica powder, quartz powder, resin beads, glass beads, hollow balloons, etc., and one or more of these can be used. By appropriately setting the type of extender pigment, mixing ratio, etc., the coating material can be adjusted to the desired gloss level.

[0045] In addition to the components described above, the primer of the present invention may also contain known additives, such as aggregates, dyes, thickeners, wetting agents, antifreezes, film-forming aids, preservatives, antifungal agents, antialgal agents, antimicrobial agents, dispersants, defoaming agents, ultraviolet absorbers, light stabilizers, antioxidants, catalysts, diluent solvents, etc., to the extent that they do not significantly impair the effects of the present invention. The primer can be manufactured by uniformly mixing each of the above components by conventional methods.

[0046] The above-mentioned primer can form a colored film by being applied using, for example, a brush, trowel, roller, or spray. The amount of primer to be applied is not particularly limited, but preferably 50 to 1000 g / m². 2 (more preferably 100-800 g / m²) 2 ) [Examples]

[0047] The following examples illustrate the features of the present invention.

[0048] (Coating material 1~11) Coating materials 1 to 11 were manufactured by mixing each raw material according to the standard method based on the formulations shown in Table 1.

[0049] The following ingredients were used: (A) Resin component • Acrylic silicone resin emulsion (50% solids by weight, medium: water) (B) Scaly colored particles (b1) Large particles • (b1-1) Black mica flakes [Short diameter: over 2mm and 4mm or less, Short diameter / Long diameter (average): 0.95, Short diameter / Thickness (average): 31.4, L value = 44.2, a value = -0.4, b value = -1.5] • (b1-2) White mica flakes [Short diameter: over 2mm and 4mm or less, Short diameter / Long diameter (average): 0.88, Short diameter / Thickness (average): 30.7, L value = 91.5, a value = 0.5, b value = 4.4] • (b1-3) Light cream-colored mica flakes [Short diameter: over 2mm and under 4mm, Short diameter / Long diameter (average): 0.92, Short diameter / Thickness (average): 31.5, L value = 86.7, a value = 0.7, b value = 14.1] • (b1-4) Gray mica flakes [Short diameter: over 2mm and up to 4mm, Short diameter / Long diameter (average): 0.98, Short diameter / Thickness (average): 32.5, L value = 70.5, a value = -0.6, b value = -0.5] (b2) Medium particles • (b2-1) Gray mica flakes [Short diameter: greater than 0.7 mm and less than or equal to 2 mm, Short diameter / Long diameter (average): 0.87, Short diameter / Thickness (average): 15.5, L value = 69.3, a value = -0.7, b value = 0.2] • (b2-2) White mica flakes [Short diameter: greater than 0.7 mm and less than or equal to 2 mm, Short diameter / Long diameter (average): 0.92, Short diameter / Thickness (average): 14.5, L value = 90.1, a value = 0.7, b value = 5.2] (b3) Small particles • (b3-1) Gray mica flakes [Short diameter: greater than 0.3 mm and less than or equal to 0.7 mm, Short diameter / Long diameter (average): 0.92, Short diameter / Thickness (average): 5.4, L value = 69.3, a value = -0.7, b value = 0.2] • (b3-2) White mica flakes [Short diameter: greater than 0.3 mm and less than or equal to 0.7 mm, Short diameter / Long diameter (average): 0.94, Short diameter / Thickness (average): 4.9, L value = 90.1, a value = 0.7, b value = 5.2] (others) • Additives (thickeners, defoamers, etc.)

[0050] (Examples 1-8, Comparative Examples 1-3) On a substrate (slate board) coated with a primer [gray: a colored film formed by the primer and (b2) a color difference (△E) = 5] of medium particles, the coating material is applied using a spray gun (nozzle diameter: 5.5 mm) at a rate of 800 g / m². 2 The material was spray-painted, dried and cured at 23°C for 24 hours, and a patterned coating was formed.

[0051] <Rating> The following evaluations were conducted, and the results are shown in Table 1. • Design Samples with minimal unevenness in the flaky colored particles and a good balance of patterns were rated "AA," while those with inferior patterns were rated "D," resulting in a five-point scale of AA > A > B > C > D. ·Smoothness The coatings were rated as "A" if they had little roughness and "D" if they had a rough texture, and evaluated on a four-point scale: A > B > C > D.

[0052] [Table 1]

[0053] In Examples 1-8, coatings with excellent design and aesthetic appeal could be easily formed. In particular, Examples 1 and 5 had minimal unevenness in the flaky colored particles, resulting in a well-balanced pattern and a smooth coating with minimal roughness. Examples 5 and 6 also exhibited excellent color versatility. On the other hand, Comparative Example 1 lacked a large pattern and was inferior in aesthetic appeal. Furthermore, Comparative Examples 2 and 3 had an uneven distribution of flaky particles, resulting in an unbalanced pattern.

Claims

1. A coating material comprising a resin component (A) and flake-like particles (B), The above coating material contains 5 to 200 parts by weight of flake-like particles (B) per 100 parts by weight of solid content of resin component (A), The above-mentioned flake-like particles (B) include large particles with a short diameter greater than 2 mm (b1), medium particles with a short diameter greater than 0.7 mm and less than or equal to 2 mm (b2), and small particles with a short diameter of 0.7 mm or less (b3). The above-mentioned intermediate particles (b2) are visible as the base pattern of the formed film. The weight ratio (b2) / (b3) of the above medium-sized particles (b2) to small particles (b3) is 2 or more and 10 or less. The above-mentioned coating material is characterized in that the mixing ratio of granular aggregate is 50 parts by weight or less per 100 parts by weight of the solid content of the above-mentioned resin component (A).

2. The coating according to claim 1, characterized in that the above-mentioned flake-like particles (B) have a weight ratio of the above-mentioned medium particles (b2) and small particles (b3) to the above-mentioned large particles (b1) [(b2) + (b3)] / (b1) of 1 or more and 50 or less.

3. The coating material according to claim 1 or 2, characterized in that the above-mentioned flake-like particles include particles of at least two colors.

4. A method for forming a coating, characterized by applying the coating material described in claim 1 to a substrate to form a coating.

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