Coating material

Abstract

To provide a colored aggregate-containing coating material capable of forming a coating film excellent in beauty.SOLUTION: The coating material of the present invention contains a resin component (A), a colored aggregate (B) having an aggregate with a Mohs hardness of greater than 5 as a base particle, and a coloring pigment (C). The colored aggregate (B) is contained in an amount of 20-2,000 pts.wt. based on 100 pts.wt. of the solid content of the resin component (A). The weight ratio of the colored aggregate (B) to the coloring pigment (C) is 100:1-100:50.SELECTED DRAWING: None

Description

Technical Field

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

Background Art

[0002] Conventionally, in the walls of buildings and the like, painting with a coating material has been performed for the purpose of surface protection, improvement of aesthetics, and the like. Among such coating materials, those containing colored aggregate as the main component are known to be able to impart a decorative property such as a stone-like appearance. For example, Japanese Unexamined Patent Application Publication No. 2004-2576 (Patent Document 1) describes a coating material formed by combining colored silica sands having color tones such as red, black, and brown. A coating material containing such colored silica sand as the main component can form a film excellent in durability, aesthetics, and the like.

[0003] By the way, as an applicator for applying a coating material, generally, a spray, a roller, a brush, a trowel, etc. are known. Among these, a spray is advantageous in terms of work efficiency and the like, but there are cases where a large-scale device is required or scattering of the material occurs. On the other hand, a method using a trowel as an applicator has attracted attention. As a trowel, for example, those provided with a handle, a trowel plate, etc. are known as in Japanese Unexamined Patent Application Publication No. 6-220988.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when applying a coating material such as that in Patent Document 1 above with a trowel, the trowel plate may be worn or damaged by repetition. In particular, as the drying of the coating material progresses, wear and damage of the trowel plate are more likely to occur, and there is a risk that the aesthetics of the formed film may be impaired.

[0006] The present invention has been made in view of such points, and an object thereof is to provide a coating material containing colored aggregate that can form a coating excellent in aesthetic appearance.

Means for Solving the Problems

[0007] As a result of intensive studies to solve such problems, the inventor of the present invention came up with a coating material containing colored aggregate, colored pigment, etc. in a specific ratio, and completed the present invention.

[0008] That is, the present invention has the following features. 1. A coating material containing colored aggregate, comprising: a resin component (A), and a colored aggregate (B) having an aggregate with a Mohs hardness of more than 5 as a base particle 、 a colored pigment (C) and a powder (D) having a Mohs hardness of 5 or less and containing the average particle diameter of the powder (D) is less than 50 μm, 20 to 2000 parts by weight of the colored aggregate (B) with respect to 100 parts by weight of the solid content of the resin component (A), the powder (D) is contained in an amount of 200 to 2000 parts by weight with respect to 100 parts by weight of the solid content of the resin component (A), and the coating material is characterized in that the weight ratio of the colored aggregate (B) to the colored pigment (C) is 100:1 to 100:50. 2. The coating material according to 1, which is applicable to trowel coating. 3. The coating material according to 2., wherein the trowel is a metal trowel.

Effects of the Invention

[0009] According to the coating material of the present invention, a coating excellent in aesthetic appearance can be formed. The coating material of the present invention can exhibit particularly advantageous effects when applied to trowel coating.

Modes for Carrying Out the Invention

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

[0011] The coating material of the present invention contains a resin component (A), a colored aggregate (B) having an aggregate with a Mohs hardness of more than 5 as a base particle, and a coloring pigment (C).

[0012] The resin component (A) (hereinafter also referred to as the “component (A)”) is a component that plays a role such as immobilizing particulate materials such as colored aggregates and coloring pigments. Examples of the type of the component (A) 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 composite systems thereof. These can be used alone or in combination of two or more. Examples of the form of the component (A) include water-soluble resin, water-dispersible resin (resin emulsion), solvent-soluble resin, solvent-free resin, non-aqueous dispersion resin, powder resin, etc. Among these, water-soluble resin and / or water-dispersible resin is preferable, and a mode containing a water-dispersible resin in particular is suitable. By using a water-soluble resin and / or a water-dispersible resin, an aqueous coating material can be obtained. Further, these resin components may be either those having a crosslinking reactivity or those not having a crosslinking reactivity.

[0013] The glass transition temperature of the component (A) is preferably 0 to 80°C, more preferably 5 to 60°C, and still more preferably 10 to 50°C from the viewpoints of stain resistance, crack prevention, etc. This glass transition temperature can be determined by Fox's calculation formula.

[0014] In the present invention, as the colored aggregate, a colored aggregate (B) (hereinafter also referred to as the “component (B)”) having an aggregate with a Mohs hardness of more than 5 as a base particle is used. The component (B) contributes to the color, pattern, texture, etc. of the coating film.

[0015] (B) component is obtained by treating matrix particles with a coloring material. As the matrix particles, aggregates with a Mohs hardness exceeding 5 are used. Examples of aggregates with a Mohs hardness exceeding 5 (preferably 6 to 9) include crushed materials such as feldspar (Mohs hardness 6.0), alumina (Mohs hardness 9.0), silica (Mohs hardness 7.0), silica sand (Mohs hardness 7.0), etc., ceramic crushed materials, and ceramic powder materials. Note that the Mohs hardness in the present invention is a value measured using a Mohs hardness tester (assuming diamond is 10).

[0016] The treatment of the matrix particles with the coloring material can be performed by a known method. Examples of the coloring material include dyes, metal ions, pigments, glazes, etc. Examples of the treatment method include a method of impregnating the coloring material into the matrix particles or a method of coating the surface of the matrix particles with the coloring material. In such treatment, a binder or the like can be used as necessary to immobilize the coloring material on the matrix particles.

[0017] The average particle diameter of the (B) component is preferably 0.05 to 3 mm, more preferably 0.06 to 1 mm, still more preferably 0.07 to 0.5 mm, and particularly preferably 0.075 to 0.2 mm. When the (B) component has such an average particle diameter, it is suitable in terms of troweling workability, etc., and a highly aesthetic coating can be formed with a relatively small coating amount, which is also advantageous in terms of thinning and lightening the coating. Note that the average particle diameter of the (B) component is a value obtained by sieving using a metal mesh sieve specified in JIS Z8801-1:2000 and calculating the average value of its weight distribution.

[0018] The mixing ratio of the (B) component is 20 to 2000 parts by weight, preferably 50 to 1600 parts by weight, more preferably 100 to 1400 parts by weight, and still more preferably 200 to 1200 parts by weight with respect to 100 parts by weight of the solid content of the (A) component. When the composition ratio of the (B) component is equal to or higher than the above lower limit, it is suitable in terms of imparting color, pattern, texture, etc. When the composition ratio of the (B) component is equal to or lower than the above upper limit, it is suitable in terms of suppressing film cracking, etc.

[0019] In addition to the above components, the coating material of the present invention further contains a coloring pigment (C) (hereinafter also referred to as "component (C)"). Component (C) is an essential component for forming a film with excellent aesthetics. For example, when the coating material containing the above-mentioned colored aggregate (B) is trowel-applied, fine detachment components caused by wear or damage of the trowel plate may cause unnecessary streaks or the like, which may impair the aesthetics. In the present invention, by containing component (C) in a specific ratio, such problems can be suppressed while making use of the color, pattern, texture, etc. of component (B).

[0020] Examples of the coloring pigment 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, valve handle, 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, dark blue, cobalt blue, phthalocyanine blue, quinacridone violet, dioxazine violet, aluminum pigment, pearl pigment, etc. These can be used alone or in combination of two or more. The average particle diameter of the coloring pigment is preferably 2 μm or less, more preferably 0.01 to 1 μm. The average particle diameter of the coloring pigment is a value measured by a laser diffraction particle size distribution measuring device.

[0021] The weight ratio of the colored aggregate (B) to the colored pigment (C), i.e., (B):(C), is from 100:1 to 100:50, preferably from 100:2 to 100:40, more preferably from 100:2.5 to 100:30, and even more preferably from 100:3 to 100:25. In the present invention, by including the component (C) in such a ratio, it is possible to suppress problems caused by wear, damage, etc. of the trowel plate while making the most of the color, pattern, texture, etc. of the component (B), and a film excellent in aesthetic appearance can be obtained. In the present invention, the aesthetic appearance can also be enhanced by the composite color development of the component (B) and the component (C). When the component (C) is too little, problems caused by wear, damage, etc. of the trowel plate cannot be suppressed, and the aesthetic appearance may be impaired. When the component (C) is too much, the characteristics of the component (B) are diminished, and the film tends to have a monotonous paint-like appearance.

[0022] In the present invention, in addition to the above components, it is possible to include a granular material (D) having a Mohs hardness of 5 or less (hereinafter also referred to as the “component (D)”). In the present invention, by using the granular material (D) having a Mohs hardness of 5 or less (preferably 1 to 4), wear, damage, etc. of the trowel plate can be alleviated, and improvement of the aesthetic appearance of the film and the like can be achieved.

[0023] Examples of the component (D) include inorganic particles such as calcium carbonate (Mohs hardness 3.0), gypsum (Mohs hardness 3.0), granite (Mohs hardness 3.0), marble (Mohs hardness 3.0), mica (Mohs hardness 2.8), clay (Mohs hardness 1.5), talc (Mohs hardness 1.0), hydrated aluminum silicate (Mohs hardness 1.0), hydrated magnesium silicate (Mohs hardness 1.0), calcined aluminum silicate (Mohs hardness 2.5), and diatomaceous earth (Mohs hardness 1.0), or organic particles such as resin beads, resin pulverized products, rubbers, plastics, plant fibers, and plant pieces. These can be used singly or in combination of two or more.

[0024] Among these, suitable component (D) includes, for example, one or more selected from calcium carbonate, gypsum, mica, clay, talc, hydrated aluminum silicate, hydrated magnesium silicate, calcined aluminum silicate, diatomaceous earth, etc. When such component (D) is used, while making use of the color-developing properties of component (B) and component (C), wear and damage of the trowel plate, etc. can be alleviated, and it becomes even more preferable in terms of improving the aesthetic appearance of the coating film and the like.

[0025] The average particle diameter of component (D) is preferably less than 50 μm, more preferably 0.5 - 45 μm, and even more preferably 1 - 40 μm. By using such component (D), while making use of the texture, etc. based on component (B), the low gloss of the coating film, etc. can be achieved, and the trowel coating workability, etc. can also be enhanced. The average particle diameter of component (D) is a value measured by a laser diffraction particle size distribution analyzer.

[0026] The mixing ratio of component (D) is preferably 200 - 2000 parts by weight, more preferably 300 - 1800 parts by weight, even more preferably 400 - 1600 parts by weight, and particularly preferably 500 - 1500 parts by weight with respect to 100 parts by weight of the solid content of component (A). When the composition ratio of component (D) is at least the above lower limit, it is suitable in terms of low gloss, texture improvement, coating workability improvement, etc., and is also advantageous when forming a relatively thin and flat coating film. When the composition ratio of (D) is at most the above upper limit, it is suitable in terms of suppressing coating film cracking, etc. From such a viewpoint, the weight ratio of component (B) to component (D) {(B):(D)} is preferably 100:25 - 100:1900, more preferably 100:70 - 100:900, and even more preferably 100:100 - 100:600.

[0027] The coating material of the present invention can also contain components other than those described above, as long as the effects of the present invention are not significantly impaired. Such components include, for example, thickeners, film-forming aids, leveling agents, wetting agents, plasticizers, antifreezing agents, pH adjusters, preservatives, fungicides, algicides, antibacterial agents, dispersants, defoamers, adsorbents, fibers, water repellents, hydrophilic agents, cross-linking agents, coupling agents, ultraviolet absorbers, light stabilizers, antioxidants, catalysts, solvents, water, and the like. The coating material of the present invention can be produced by uniformly mixing the above-mentioned resin component (A), colored aggregate (B), colored pigment (C), and, if necessary, the above components and the like by a conventional method.

[0028] The coating material of the present invention can be applied, for example, to the wall surfaces of buildings, civil engineering structures, etc. Examples of the substrate constituting such a surface to be coated include concrete, mortar, ceramic tiles, fiber-reinforced cement boards, calcium silicate cement boards, slag cement perlite boards, cement boards, ALC boards, siding boards, gypsum boards, plywood, extruded boards, steel plates, plastic plates, and the like. The surfaces of these substrates may be those subjected to some surface treatment (for example, treatment with putty, sealer, surfacer, filler, etc.), those on which a coating film has already been formed, those on which wallpaper or the like is pasted, or the like. When using an undercoating material such as a sealer, surfacer, filler, etc., the color tone thereof can be set to an approximate color (co-color) of the coating material.

[0029] In the application of the coating material of the present invention, for example, a spray, roller, brush, trowel, etc. can be used, but in the present invention, it is desirable to use at least a trowel. Trowels are classified according to the material of the trowel plate. In the present invention, for example, metal trowels, wooden trowels, plastic trowels, etc. can be used. In the present invention, particularly advantageous effects can be achieved when using a metal trowel. The metal trowel is not particularly limited, and a known shape can be used. The thickness of the trowel plate is preferably 0.1 to 1 mm. Examples of the metal trowel plate include iron plates, steel plates, aluminum plates, stainless steel plates, and the like.

[0030] Specifically, the coating of the coating material of the present invention can be carried out by applying the coating material to the surface to be coated and then spreading the applied coating material. In the present invention, it is desirable to use a trowel, and it is more desirable to use a trowel when applying the coating material to the surface to be coated and when spreading the coating material. When using a trowel to spread the coating material, it is easier to obtain a flat film by leveling the coating surface. When spreading the coating material, the coating surface can also be leveled while supplying water or a solvent to the coating surface by spraying or the like.

[0031] In the present invention, a film can be formed using one or two or more coating materials. When using two or more coating materials of different colors, a colorful film in which multiple colors are mixed can also be formed.

[0032] The coating amount (in terms of solid content) of the coating material is preferably 80 to 3000 g / m 2 , more preferably 150 to 1000 g / m 2 , still more preferably 200 to 750 g / m 2 , particularly preferably 300 to 700 g / m 2 . In the present invention, a film with high aesthetic properties can be formed with a relatively small coating amount, and the film can be made thinner and lighter in weight.

[0033] Drying after coating the coating material may be carried out at normal temperature (preferably 0 to 50°C, more preferably 5 to 45°C), and heating can also be carried out if necessary. After coating the coating material, polishing, clear coating, etc. can also be carried out if necessary.

Examples

[0034] Examples are shown below to make the features of the present invention clearer, but the present invention is not limited to these examples.

[0035] Each component was uniformly mixed by a conventional method at the mixing ratios shown in Table 1 to produce each coating material. The following raw materials were used for the production of the coating material. · Resin 1: Acrylic resin emulsion (solid content 50% by weight, glass transition temperature 30°C, average particle diameter 120 nm) Colored aggregate 1: White silica sand (silica sand with a Mohs hardness of 7.0, surface-coated with a white colorant, average particle size 150 μm) Color pigment 1: Black pigment dispersion (20% by weight dispersion of carbon black (average particle size 0.05 μm)) Color pigment 2: Yellow pigment dispersion (50% by weight dispersion of yellow iron oxide (average particle size 0.5 μm)) Colored pigment 3: Red pigment dispersion (50% by weight dispersion of red iron oxide (average particle size 0.2 μm)) Color pigment 4: White pigment dispersion (60% by weight dispersion of titanium dioxide (average particle size 0.3 μm)) Powder 1: Heavy calcium carbonate (Mohs hardness 3.0, average particle size 15 μm) Fiber: inorganic fiber (average fiber length 0.1 mm) Dispersant: Polycarboxylic acid dispersant Coalescence aid: Ether-based coalescence aid Thickener: Hydroxyethyl cellulose 3% by weight aqueous solution Antifoaming agent: Silicone-based antifoaming agent

[0036] [Table 1]

[0037] Example 1 A slate board that had been previously coated with a white sealer was prepared as the surface to be coated. Coating material 1 was applied to this surface with a metal trowel, and then immediately spread and smoothed with a metal trowel to form a coated surface. The amount of coating material 1 applied (in terms of solid content) was 450 g / m 2 After drying for 24 hours, the appearance of the coating was checked and it was found that a white coating with low gloss and a smooth, natural texture had been obtained.

[0038] Example 2 Coating was carried out in the same manner as in Example 1, except that Coating Material 2 was used instead of Coating Material 1. When the appearance of the coating was checked, a white coating with low gloss and a smooth, natural texture was obtained.

[0039] Example 3 Coating was performed in the same manner as in Example 1 except that Coating Material 3 was used instead of Coating Material 1. When the appearance of the coating film was examined, a white coating film with a low gloss, flat, and natural texture was obtained.

[0040] (Example 4) Coating was performed in the same manner as in Example 1 except that Coating Material 4 was used instead of Coating Material 1. When the appearance of the coating film was examined, a gray coating film with a low gloss, flat, and natural texture was obtained.

[0041] (Comparative Example 1) Coating was performed in the same manner as in Example 1 except that Coating Material 5 was used instead of Coating Material 1. As a result, blackish streaks were sporadically seen in the white coating film.

[0042] (Comparative Example 2) Coating was performed in the same manner as in Example 1 except that Coating Material 6 was used instead of Coating Material 1. As a result, a monotonous white coating film without the texture as in the example was obtained.

Claims

**Claim 1** A coating material containing colored aggregate, comprising: a resin component (A), a colored aggregate (B) having an aggregate with a Mohs hardness of more than 5 as a base particle, a coloring pigment (C), and a powder particle (D) with a Mohs hardness of 5 or less; the average particle diameter of the powder particle (D) is less than 50 μm; 20 to 2000 parts by weight of the colored aggregate (B) is contained per 100 parts by weight of the solid content of the resin component (A); 200 to 2000 parts by weight of the powder particle (D) is contained per 100 parts by weight of the solid content of the resin component (A); a coating material, characterized in that the weight ratio of the colored aggregate (B) to the coloring pigment (C) is 100:1 to 100:

50. **Claim 2** The coating material according to claim 1, characterized in that it is applicable to trowel coating. **Claim 3** The coating material according to claim 2, characterized in that the trowel is a metal trowel.

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