JP2017145415A - Coating composition, coated body and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating composition capable of evenly forming a metallic coating film with high luminance, even when coating using a brush or roller.SOLUTION: A coating composition includes a flaky metal pigment and a coloring pigment. A content of a non-volatile component in the coating composition is 35-60 mass%. A pigment volume concentration in the non-volatile component is 10-25 vol.%. A contrast ratio is 0.1-50% when the flaky metal pigment is removed from the non-volatile component in the coating composition. Here, the contrast ratio is measured in compliance with JIS K-5600-4-1 method B.SELECTED DRAWING: None

Description

The present invention relates to a coating composition, a coated body using the coating composition, and a method for producing the coated body, and in particular, a metal-tone coating film having high brightness without unevenness even when coating is performed using a brush or a roller. It is related with the coating composition which can form.

Metallic paints that can form high-intensity, high-design coatings are widely used in automobiles, household appliances, office equipment, toys, and structures such as buildings and structures. Metallic paints are generally blended with scaly metal pigments such as aluminum.If these scaly metal pigments are arranged in parallel to the substrate, It becomes a bright coating.

In addition, a technique for expressing a color different from the color derived from the scale-like metal pigment while maintaining the metallic luster derived from the scale-like metal pigment by combining the color pigment with the scale-like metal pigment is also known.

Japanese Patent Application Laid-Open No. 2003-96334 (Patent Document 1) describes a composite pigment in which a colored pigment adheres to the surface of aluminum flakes. Japanese Patent Application Laid-Open No. 63-258993 (Patent Document 2) describes combining an optional component with a coloring pigment as an essential component. Japanese Patent Application Laid-Open No. 2007-106925 (Patent Document 3) describes that a transparent scaly substrate is combined with a low brightness glitter pigment coated with titanium oxide or the like and a transparent colored pigment.

JP 2003-96334 A Japanese Unexamined Patent Publication No. 63-258873 JP 2007-106925 A

Regarding the coating composition containing a scaly metal pigment, the most common method for arranging scaly metal pigments in parallel is a method of controlling the orientation of the scaly metal pigment by spray coating. Coating compositions containing scale-like metal pigments can form a lustrous coating film by spray painting, but when repainting structures (buildings and structures) that have already been constructed or constructed, painting There was a problem that would be difficult. For example, among spray coatings, electrostatic spray coating is preferable from the viewpoint of coating efficiency, but outdoor coating is difficult, and is unsuitable for repainting buildings and structures. In addition, when air spray painting or airless spray painting is performed outdoors, the paint is scattered to the surroundings, which is not preferable from the viewpoint of cost and environment. For this reason, when adopting spray painting, indoor painting is preferable, and it can be said that spray painting is unsuitable for outdoor painting.

On the other hand, there are brush painting and roller painting as painting means, and it is known that these painting means are excellent in outdoor coating efficiency compared with spray painting. However, when a coating composition containing a scaly metal pigment is applied onto a substrate by brush coating or roller coating, there is a problem that unevenness appears in the metallic tone coating film and the brightness is lowered. Furthermore, if it says about the coating composition which contains a color pigment in addition to a scale-like metal pigment, the orientation control of a scale-like metal pigment will become more difficult.

Accordingly, an object of the present invention is to provide a coating composition that solves the above-described problems of the prior art and can form a high-brightness metal-tone coating film evenly when coating is performed using a brush or a roller. There is to do.

In addition, another object of the present invention is to provide a coated body provided with a metal-tone coating film with high brightness without unevenness even when coating is performed using a brush or a roller, and a method for producing the coated body. .

As a result of intensive studies to achieve the above object, the present inventor has found that a paint composition containing a scaly metal pigment and a colored pigment is blended with a high volume concentration (or pigment volume concentration (PVC: Pigment)). By increasing the Volume Concentration), it was found that a high-intensity metallic coating can be formed even when coating is performed using a brush or a roller, and the present invention has been completed. In addition, when the ratio of the scale-like metal pigment in a coating composition becomes high, it is known that the gloss of a coating film will be reduced, and when preparing a coating composition for the purpose of forming a metallic-tone coating film, Since the ratio of the scale-like metal pigment tends to be lowered, the effect of the present invention is surprising.

That is, the coating composition of the present invention is a coating composition containing a scaly metal pigment and a colored pigment, wherein the nonvolatile content in the coating composition is 35 to 60% by mass and A pigment composition having a pigment volume concentration of 10 to 25% by volume,
The concealment rate when the scale-like metal pigment is removed from the nonvolatile content of the coating composition is 0.1 to 50%.
Here, the concealment rate is measured according to JIS K-5600-4-1 method B.

In a preferred example of the coating composition of the present invention, the color pigment has a 50% volume average diameter of 5 to 1.
It is in the range of 000 nm.

In the other suitable example of the coating composition of this invention, the ratio of the scale-like metal pigment to the pigment contained in the said coating composition is 0.1-99.9 mass%.

  In another preferred embodiment of the coating composition of the present invention, the colored pigment is an inorganic pigment.

In another preferred embodiment of the coating composition of the present invention, it further contains a solvent having a mixed aniline point or an aniline point defined in JIS K 2256 in the range of 12 to 70 ° C.

  In another preferred embodiment of the coating composition of the present invention, an amide compound is further contained.

Moreover, the manufacturing method of the coating body of this invention coats a building or a structure with said coating composition.

Furthermore, the coated body of the present invention comprises a building or a structure and a coating film formed on the building or the structure, and the coating film is formed from the coating composition described above. .

According to the coating composition of the present invention, it is possible to provide a coating composition capable of forming a high-brightness metal-tone coating film evenly when coating is performed using a brush or a roller. In addition, by using the coating composition of the present invention, there is provided a coated body provided with a high-quality metallic coating without unevenness even when coating is performed using a brush or a roller, and a method for producing the coated body. be able to.

Below, the coating composition of this invention is demonstrated in detail. The coating composition of the present invention is a coating composition containing a scaly metal pigment and a colored pigment, wherein the nonvolatile content in the coating composition is 35 to 60% by mass and the pigment in the nonvolatile content It is a coating composition having a volume concentration of 10 to 25% by volume, and the concealment rate when the scaly metal pigment is removed from the nonvolatile content of the coating composition is 0.1 to 50%, where the concealment rate is It is measured according to JIS K-5600-4-1 method B.

From the viewpoint of improving the coating workability and the finished appearance of the coating film, the coating composition of the present invention has a nonvolatile content of 35 to 60% by mass. In the present invention, the coating composition is 130
The component remaining when dried at 60 ° C. for 60 minutes is treated as a nonvolatile content.

Moreover, in the coating composition of this invention, the pigment volume concentration in a non volatile matter is 10-25 volume%. In addition, the pigment here refers to all the pigments contained in a coating composition, and when pigments other than a scale-like metal pigment and a coloring pigment are used, the pigment is also contained. When the pigment volume concentration in the non-volatile content is 10% by volume or more, a high-intensity metal-tone coating film can be formed evenly when coating is performed using a brush or a roller. When the pigment volume concentration is high, the degree of freedom of the scale-like metal pigment is low, and it is estimated that such an effect can be achieved by being present in the coating film in a state of being arranged in parallel with the base material. The On the other hand, when the pigment volume concentration in the non-volatile content exceeds 25% by volume, the amount of the pigment in the coating film is excessively increased and other coating film properties are deteriorated.

The pigment volume concentration in the non-volatile content can be obtained by calculation from the composition and specific gravity of each component constituting the non-volatile content.

In addition, the coating composition of the present invention includes a pigment such as a flaky metal pigment or a colored pigment, but the present invention can be applied, for example, when the hiding power of a pigment other than the flaky metal pigment is too strong. It was found that even with a pigment volume concentration of 1, it was not possible to form a metallic coating film with high brightness without unevenness. For this reason, it is important to adjust the hiding power of components other than the scale-like metal pigment among the components (nonvolatile content) constituting the coating film. In the coating composition of this invention, the concealment rate at the time of remove | excluding a scale-like metal pigment from the non volatile matter of this coating composition is 0.1 to 50%. If the concealment ratio is in the range of 0.1 to 50%, a uniform and high-brightness metal-tone coating film can be reliably formed. In the present invention, the concealment rate is JIS K-5600-4-1.
Measured according to Method B. For example, a coating composition for measuring the concealment ratio can be easily prepared by blending a volatile component such as a solvent in place of the scale-like metal pigment.
Using a 0 μm film applicator or the like, it can be applied to black-and-white concealment rate test paper to confirm the concealing power of non-volatile components other than the scale-like metal pigment. In this invention, the dry film thickness at the time of measuring a concealment rate is made into the range of 15-25 micrometers.

In the coating composition of the present invention, the scaly metal pigment is a metal pigment having a thin and flat shape such as a foil. For example, metal pigments such as aluminum, nickel, chromium, tin, copper, silver, platinum, and gold Furthermore, pigments of alloys such as stainless steel are also included. Among these, aluminum pigments are preferably used. These metal pigments may be used alone,
Two or more kinds may be used in combination.

The scaly metal pigment preferably has a 50% volume average diameter of 0.1 to 60 μm,
More preferably, it is 5-50 micrometers. The 50% volume average diameter of the scale-like metal pigment is 60 μm
If it is the following, the coating film which is more excellent in metallic luster can be formed. On the other hand, when the 50% volume average diameter of the scaly metal pigment is less than 0.1 μm, the aspect ratio of the scaly metal pigment tends to be small, and the metallic luster may not be sufficiently obtained.

In the present invention, the 50% volume average diameter of the scaly metal pigment refers to the 50% particle diameter (D ₅₀ ) of the volume-based particle size distribution, and a particle size distribution measuring device (for example, a laser diffraction / scattering particle size distribution measuring device) is used. It can be determined from the particle size distribution measured by And the particle diameter in this invention is represented by the spherical equivalent diameter by a laser diffraction and a scattering method.

Further, the scale-like metal pigment preferably has an aspect ratio of 1 or more, and more preferably 3 or more. If the aspect ratio of the scale-like metal pigment is 1 or more, the metallic luster of the coating film can be further improved. The upper limit of the aspect ratio of the scale-like metal pigment is usually about 400. Here, the aspect ratio of the scaly metal pigment is 50% volume average diameter (D).
And the average thickness (T) (D / T). In the present invention, the thickness of the scaly metal pigment was measured using an SEM (scanning electron microscope), and the average thickness was determined for 100 or more particles.

In addition, according to the coating composition of the present invention, even when the scaly metal pigment is a non-leafing type aluminum pigment, a uniform and high-brightness metallic coating film is applied when coating with a brush or a roller. Can be formed. As the aluminum pigment, an aluminum pigment having a leafing property (leafing type) and an aluminum pigment having a non-leafing property (non-leafing type) are known. Leafing refers to a phenomenon in which when a coating film is prepared, aluminum pigments float on the surface of the coating film and are arranged in parallel.Non-leafing means that the aluminum pigment floats on the coating film surface even if the coating film is prepared. It refers to a phenomenon that is not dispersed in the coating film. For this reason, when preparing a coating composition for the purpose of forming a metallic coating film, it is usually preferable to use a leafing type aluminum pigment. However, when the aluminum pigment floats on the surface of the coating film, the aluminum pigment is easily peeled off from the coating film, and therefore, when touched, the aluminum pigment tends to adhere to clothes and the body. For this reason, it is usually used for applications that are not touched by humans. On the other hand, since the non-leafing type aluminum pigment is difficult to disperse in the coating film in a state of being arranged in parallel, there is a problem that unevenness appears in the metallic tone coating film and the luminance is lowered. However, according to the coating composition of the present invention, such a problem can be solved by increasing the pigment volume concentration.

Commercially available leafing type aluminum pigments and non-leafing type aluminum pigments can be used, but these aluminum pigments are usually imparted with leafing properties and non-leafing properties by surface treatment with fatty acids. Yes.
As a specific example, an aluminum pigment surface-treated with oleic acid is used as a non-leafing type.

In the coating composition of the present invention, the pigment volume concentration in the nonvolatile content is 10 to 25% by volume.
If so, the amount of the flaky metal pigment can be appropriately adjusted, but from the viewpoint of arranging the flaky metal pigment in parallel more reliably, the ratio of the flaky metal pigment to the pigment is 0.1. ~ 9
It is preferable that it is 9.9 mass%.

In the coating composition of the present invention, the color pigment includes a pigment usually used as a colorant in the paint industry, but excludes a bright pigment such as a scaly metal pigment. A desired color can be expressed by using a color pigment in combination with a scale-like metal pigment. In addition, since the quantity of a coloring pigment is suitably adjusted according to the color to express, as long as the pigment volume density | concentration in a non volatile matter is 10-25 volume%, it will not restrict | limit in particular.

In the coating composition of the present invention, the coloring pigment is preferably an inorganic pigment, and yellow iron oxide, red iron oxide, cobalt blue, and a fired pigment are particularly preferable from the viewpoint of improving weather resistance. Moreover, in the coating composition of this invention, the shape of a color pigment does not need to be scaly, and can use the color pigment of various shapes, such as needle shape, spherical shape, and scaly shape. In addition, the color pigment used for this invention may be used individually by 1 type, and may be used in combination of 2 or more type.

In the coating composition of the present invention, the color pigment preferably has a 50% volume average diameter in the range of 5 to 1000 nm, more preferably in the range of 10 to 500 nm,
Most preferably, it is in the range of ˜100 nm. The color pigment has a 50% volume average diameter of 100
If it is 0 nm or less, a decrease in transparency due to the color pigment can be prevented, and the metallic luster is not adversely affected. On the other hand, if the 50% volume average diameter of the colored pigment is less than 5 nm, the coloring power of the colored pigment becomes weak, and a desired color may not be expressed or may be difficult to express.

In the present invention, the 50% volume average diameter of the color pigment is the 50% particle diameter of the volume standard particle size distribution (
D ₅₀ ) and can be determined from the particle size distribution measured using a particle size distribution measuring device (for example, a laser diffraction / scattering particle size distribution measuring device). And the particle diameter in this invention is represented by the spherical equivalent diameter by a laser diffraction and a scattering method.

From the viewpoint of dispersing the pigment, the coating composition of the present invention preferably further contains an organic solvent for the purpose of adjusting the viscosity, etc., and the mixed aniline point or aniline point defined in JIS K 2256 is 12 to 12. More preferably, it contains a solvent in the range of 70 ° C. Such a solvent is an organic solvent that has a relatively low environmental impact, and is generally classified as a weak solvent in the paint industry, and can be removed by drying at room temperature. The aniline point and the mixed aniline point are a kind of index representing the solvent dissolving power, and the higher the aniline point or the mixed aniline point, the weaker the dissolving power. The aniline point is the lowest temperature at which equal volumes of solvent and aniline exist as a homogeneous solution, and the mixed aniline point is the lowest temperature at which 1 volume of solvent, 1 volume of heptane and 2 volumes of aniline exist as a uniform solution. . When the mixed aniline point or the aniline point is less than 12 ° C., the solvent has too strong dissolving power, so when the coating composition is applied to the coated substrate, the coating film (old coating film) already covering the substrate is used as the solvent. It is not preferred because it may be eroded (specifically, the old coating film dissolves or swells) and problems such as lifting may occur. On the other hand, when the mixed aniline point or aniline point exceeds 70 ° C., the dissolving power of the solvent is too weak, which makes it difficult to dissolve a resin having practical performance.

Examples of the mixed aniline point or the solvent having an aniline point in the range of 12 to 70 ° C. include:
Examples thereof include hydrocarbon organic solvents such as aliphatic solvents, naphthenic solvents, and aromatic naphtha. Specific examples of the hydrocarbon-based organic solvent include methylcyclohexane (aniline point: 40 ° C.)
, Ethylcyclohexane (aniline point: 44 ° C.), mineral spirit (aniline point: 5)
6 ° C.) and turpentine oil (aniline point: 44 ° C.). In addition, the hydrocarbon-based organic solvents include those commercially available as petroleum-based hydrocarbons, for example, HAWS (manufactured by Shell Chemicals Japan, aniline point: 17 ° C.), LAWS (manufactured by Shell Chemicals Japan,
Aniline point: 44 ° C.), Essonaphtha No. 6 (made by ExxonMobil, aniline point: 4
3 ° C), Pegasol 3040 (ExxonMobil, aniline point: 55 ° C), Pegasol AN45 (ExxonMobil, aniline point 42 ° C), A Solvent (Shin Nippon Oil Co., Ltd., aniline point: 45 ° C), Clensol (Manufactured by Nippon Oil Co., Ltd., aniline point: 64 ° C.), mineral spirit A (manufactured by Nippon Oil Corporation, aniline point: 43 ° C.), Hyalom 2S (manufactured by Nippon Oil Corporation, aniline point: 44 ° C.), Exol D30 ( ExxonMobil, aniline point: 64 ° C), Exol D40 (ExxonMobil, aniline point: 69 ° C), New Sol DX Hisoft (Shin Nippon Oil Co., aniline point: 68 ° C), Solvesso 100 (ExxonMobil) Product, mixed aniline point: 14 ° C., Solvesso 150 (manufactured by ExxonMobil, mixed aniline point: 18. ° C.), Swasol 100 (Maruzen Petrochemical Co., mixed aniline point: 24.6 ° C.), Swasol 200 (Maruzen Petrochemical Co., mixed aniline point: 23.8
° C), SWAZOL 1000 (manufactured by Maruzen Petrochemical Co., Ltd., mixed aniline point: 12.7 ° C), SWAZOL 1500 (manufactured by Maruzen Petrochemical Co., Ltd., mixed aniline point: 16.5 ° C), SWAZOL 1800
(Maruzen Petrochemical Co., Ltd., mixed aniline point: 15.7 ° C.), Idemitsu Ipsol 100 (Idemitsu Kosan Co., Ltd., mixed aniline point: 13.5 ° C.), Idemitsu Ipsol 150 (Idemitsu Kosan Co., Ltd., mixed aniline point: 15) .2 ° C.), Pegazole ARO-80 (ExxonMobil, mixed aniline point: 25 ° C.), Pegazole R-100 (ExxonMobil, mixed aniline point: 14 ° C.)
), Akishi Toshihizoru (manufactured by Shell Chemicals Japan, mixed aniline point: 12.6 ° C)
And Nisseki Hyzol (manufactured by Nippon Oil Corporation, mixed aniline point: 17 ° C. or lower). In addition, these weak solvents may be used individually by 1 type, and may be used in combination of 2 or more type.

In the coating composition of the present invention, the content of the organic solvent is preferably 40 to 65% by mass, for example. In the coating composition, “JIS K 225” in the organic solvent.
The ratio of “mixed aniline point or solvent having an aniline point within the range of 12 to 70 ° C.” defined in 6 is preferably 50% by mass or more, and the upper limit is 100% by mass. The other organic solvents are not particularly limited, and various conventionally known organic solvents such as ketones, esters, ethers, alcohols and the like can be used.

The coating composition of the present invention preferably further contains an amide compound from the viewpoint of forming a metallic coating film having high brightness without unevenness even when coating is performed using a brush or a roller. Here, preferred examples of the amide compound include fatty acid amide compounds. In the coating composition of this invention, it is preferable that content of an amide compound is 0.05-1.0 mass%.

The fatty acid amide compound is preferably a primary amide and a secondary amide.
Specific examples of the fatty acid amide compound include palmitic acid amide, stearic acid amide, behenic acid amide, hydroxy stearic acid amide, methylol stearic acid amide, methylol behenic acid amide, methylene bislauric acid amide, methylene bishydroxy stearic acid amide, methylene. Bisoleic acid amide, ethylene bisisostearic acid amide, hexamethylene bishydroxystearic acid amide, butylene bishydroxystearic acid amide, ethylene bisoleic acid amide, ethylene biserucic acid amide, hexamethylene bisoleic acid amide, m-xylylene bis Stearamide, ethanolamine distearate, lauric acid amide, oleic acid amide, erucic acid amide, ricinoleic acid amide,
Methylene bis stearamide, ethylene bis caprylic amide, ethylene bis lauric acid amide, ethylene bis stearic acid amide, ethylene bis hydroxy stearic acid amide, ethylene bis behenic acid amide, hexamethylene bis behenic acid amide, hexamethylene bis stearic acid amide Etc. In addition, these amide compounds may be used individually by 1 type, and may be used in combination of 2 or more type.

The coating composition of the present invention is preferably a two-component coating composition comprising a main agent containing at least a polyol and a curing agent containing at least a polyisocyanate. Such a coating composition is used by mixing a main agent and a curing agent at the time of coating, and a resin having a urethane bond is formed by a reaction between a polyol and a polyisocyanate. It can be easily used as a composition. When the coating composition of the present invention is a one-pack type coating composition, a binder resin usually used in the coating industry, for example,
Acrylic resin, polyester resin, rosin resin, petroleum resin, coumarone resin, phenol resin, urethane resin, melamine resin, urea resin, epoxy resin, cellulose resin, xylene resin, alkyd resin, aliphatic hydrocarbon resin, butyral resin, maleic acid A resin, a fumaric acid resin, a vinyl resin, a fluorine resin, a silicone resin, or the like can be used. The coating composition of the present invention will be described below based on a suitable two-pack type coating composition.

The main agent contains at least a polyol, and the above-described scale-like metal pigment, color pigment, organic solvent, amide compound, and the like can be appropriately blended.

A polyol is a compound having two or more hydroxyl groups, and forms a urethane bond by reacting with an isocyanate group of a polyisocyanate.
It is preferable to include at least one resin selected from the group consisting of a hydroxyl group-containing acrylic resin, a hydroxyl group-containing acrylic silicone resin, and a hydroxyl group-containing fluorine resin. Commercially available products can be suitably used for these hydroxyl group-containing resins, but for example, they can be easily obtained by using a hydroxyl group-containing monomer when synthesizing an acrylic resin, an acrylic silicone resin, or a fluorine resin.

In the coating composition of the present invention, the ratio of the hydroxyl group-containing resin (that is, the hydroxyl group-containing acrylic resin, the hydroxyl group-containing acrylic silicone resin, and the hydroxyl group-containing fluorine resin) in the polyol is preferably 50% by mass or more, and the upper limit thereof. Is 100% by mass. In addition, it does not specifically limit as polyols other than the said hydroxyl-containing resin, Conventionally well-known various polyols, for example, polyester polyol, polyurethane polyol, polyether polyol, etc. can be used.

The polyol preferably has a number average molecular weight of 300 to 10,000, preferably 400 to
More preferably, it is 2,000. When the number average molecular weight of the polyol is less than 300, a coating film having sufficient tack-freeness may not be obtained. On the other hand, when the number average molecular weight exceeds 10,000, the coating workability may be deteriorated. The number average molecular weight is a polystyrene-reduced number average molecular weight measured by gel permeation chromatography.

The polyol preferably has a hydroxyl value of 5 to 150 mgKOH / g. The hydroxyl value is the number of mg of potassium hydroxide required to neutralize a free hydroxyl group in 1 g of a sample after complete acetylation with acetic anhydride.

In the coating composition of the present invention, the polyol content is preferably 20 to 42% by mass.

Although the said hardening | curing agent contains polyisocyanate at least, the scale-like metal pigment mentioned above, a coloring pigment, an organic solvent, an amide compound, etc. can be mix | blended suitably. The polyisocyanate preferably has 0.5 to 1.5 equivalents of isocyanate groups, more preferably 0.8 to 1.2 equivalents, based on the hydroxyl groups of the polyol. Thus, the content of the polyisocyanate is appropriately adjusted according to the amount of the functional group of the polyol. For example, the content of the polyisocyanate in the coating composition of the present invention is 0.5 to
It is preferable that it is 15 mass%.

The polyisocyanate is a compound having two or more isocyanate groups, and includes, for example, aliphatic, aromatic or araliphatic polyisocyanates. Specific examples include tolylene diisocyanate and 4,4′-diphenylmethane diisocyanate. , Xylylene diisocyanate, hexamethylene diisocyanate, 4,4′-methylenebis (cyclohexyl isocyanate), methylcyclohexane diisocyanate, bis (isocyanate methyl) cyclohexane, isophorone diisocyanate, dimer acid diisocyanate,
In addition to lysine diisocyanate, modified products of these polyisocyanates can be mentioned. Specific examples of the modified product include a biuret modified product, an isocyanurate modified product, an adduct modified product (for example, trimethylolpropane adduct), an allophanate modified product, and a uretdione modified product. Among these, various modified products of hexamethylene diisocyanate and various modified products of isophorone diisocyanate are preferable from the viewpoints of curability and coating film characteristics. In addition, these polyisocyanate may be used independently and may be used in combination of 2 or more type.

The coating composition of the present invention includes other pigments such as extender pigments and rust preventive pigments, reaction catalysts, dispersants, antifoaming agents, dehydrating agents, leveling agents, surface conditioners, anti-settling agents, anti-sagging agents, You may mix | blend an anti-algae agent, a fungicide, a preservative, a ultraviolet absorber, a light stabilizer etc. suitably as needed.

The coating composition of the present invention (in the case of a two-component coating composition, a main agent and a curing agent) can be prepared by mixing various components appropriately selected as necessary.

The coating composition of the present invention has a shear rate of 0.1 s ^{−1 and} a viscosity of 0.1 to 10,000 Pa ·
and the viscosity at a shear rate of 1,000 s ⁻¹ is preferably 0.05 to 10 Pa · s. In the present invention, the viscosity is a rheometer AR manufactured by TA Instruments.
It is measured after adjusting the liquid temperature to 23 ° C. using ES.

The coating method is not particularly limited, and known coating means such as brush coating, roller coating, trowel coating, spatula coating, spray coating and the like can be used. However, the coating composition of the present invention can be used for brush coating or roller coating. Is suitable for use.

In addition, the object to which the coating composition of the present invention is applied is not particularly limited, and even when the structure fixed on the land is repainted, the coating composition of the present invention can be applied without unevenness. It is possible to form a high-intensity metallic coating film. Therefore, the coating composition of the present invention is
It is suitable as a coating composition for coating a building or a structure. In the present invention, a building means a structure built for the purpose of living or staying by a person, such as a house, building, factory, etc., and a structure is a purpose for living or staying by a person. This means a structure constructed for other purposes, such as a chimney and a multi-story parking lot.

Next, the coated body of the present invention will be described in detail. The coated body of the present invention includes a building or a structure and a coating film (hereinafter also referred to as a metal-based coating film) formed on the building or the structure, and the coating film of the present invention described above. It is formed from a coating composition. By using the coating composition of the present invention, it is possible to form a metallic coating film with high brightness without any unevenness in a desired color.

The coated body of the present invention preferably includes an undercoat film between the building or structure and the metallic paint film. Thereby, since a metallic tone coating film can be formed on a more uniform surface, the nonuniformity of a metallic tone coating film can be prevented more reliably. In addition, by providing an undercoat coating film, the adhesion of the entire coating film to the structure can be improved, and if an enamel paint is used as the undercoat paint, the structure can be more reliably concealed. Can be improved. In the present invention, the enamel paint refers to a paint containing a colorant.

The coated body of the present invention preferably includes a clear coating film formed on a metal-tone coating film.
Thereby, the glossiness of a coating film can be improved. According to the present invention, by increasing the pigment volume concentration (particularly the content of the scale-like metal pigment), the gloss of the coating tends to decrease. The formation of is preferred. In addition, it can easily adjust the gloss of the coating film by blending extender pigments such as calcium carbonate, talc, clay, silica, white carbon, amorphous silica, silica sand, barite, precipitated barium sulfate, and resin beads into the clear paint. can do. In the present invention, the clear paint refers to a paint containing no colorant.

The coated body of the present invention includes at least a metallic coating film, and preferably includes one or both of a primer coating film and a clear coating film. In addition, it is preferable that the thickness of a metal-tone coating film is 5-30 micrometers, it is preferable that the thickness of an undercoat coating film is 10-40 micrometers, and the thickness of a clear coating film is 5-30 micrometers. It is preferable.

Next, the manufacturing method of the coated body of this invention is demonstrated in detail. The manufacturing method of the coated body of this invention is characterized by including the process (henceforth a 1st process) which coats a building or a structure with the coating composition of this invention mentioned above. By using the coating composition of the present invention, it is possible to form a metallic coating film with high brightness without any unevenness in a desired color.

It is preferable that the manufacturing method of the coating body of this invention further includes the 2nd process of coating a building or a structure with undercoating and forming an undercoating film before a 1st process. In this case, the above-described coating with the coating composition of the present invention is performed on the undercoat coating film. For the undercoat paint, various conventionally known paints such as an organic solvent paint using an organic solvent as a solvent, a water paint using water as a main solvent, a solvent-free paint, various enamel paints of a powder paint or a clear paint are used. Although possible, organic solvent-based enamel paint or water-based enamel paint is preferred. Examples of the resin that can be used for the undercoat paint include various synthetic resins such as acrylic resin, alkyd resin, polyester resin, polyurethane resin, epoxy resin, silicone resin, and fluororesin. In addition, these resin may be used individually by 1 type, and may be used in combination of 2 or more type. In the above undercoat paint, other components include pigment, curing agent component, ultraviolet absorber, light stabilizer, rheology modifier, leveling agent, antioxidant, plasticizer, rust inhibitor, solvent, filler, pH adjustment. Additives such as an agent, an antifoaming agent, a charge control agent, a stress relaxation agent, a penetrating agent, a light guide material, a magnetic material, a phosphor and a wax may be used as necessary. The undercoat paint can be prepared by mixing various components appropriately selected as necessary. The method of applying the undercoat paint is not particularly limited, and known painting means such as brush painting, roller painting, trowel painting, spatula painting, spray painting, etc. can be used, but brush painting or roller painting is preferred.

It is preferable that the manufacturing method of the coating body of this invention further includes the 3rd process of coating a metal-tone coating film with a clear coating and forming a clear coating film after a 1st process. For clear paint,
Conventionally known various paints such as an organic solvent-based paint using an organic solvent as a solvent, a water-based paint using water as a main solvent, a solvent-free paint, and a powder paint can be used. Examples of resins that can be used for the clear coating include various synthetic resins such as acrylic resins, alkyd resins, polyester resins, polyurethane resins, epoxy resins, silicone resins, and fluororesins. In addition, these resin may be used individually by 1 type, and may be used in combination of 2 or more type. In the clear coating, other components include a curing agent component, an ultraviolet absorber, a light stabilizer,
Rheology modifier, leveling agent, antioxidant, plasticizer, rust inhibitor, solvent, filler, pH adjuster, antifoaming agent, charge control agent, stress relaxation agent, penetrant, light guide material, magnetic material, wax Additives such as may be used as necessary. The clear paint can be prepared by mixing various components appropriately selected as necessary. The method for applying the clear coating is not particularly limited, and known coating means such as brush coating, roller coating, trowel coating, spatula coating, spray coating, and the like can be used. Brush coating or roller coating is preferable.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.

<Luminous pigment dispersion 1>
Hitaroid 6500B (Hitachi Chemical Co., Ltd. Hydroxyl-containing acrylic resin mineral spirit solution, nonvolatile content 50 mass%, nonvolatile content hydroxyl value 30 mgKOH / g) in a mixer 10
In 0 part by mass, 50 parts by mass of mineral spirit, Alpaste 7675NS (non-leafing type aluminum paste manufactured by Toyo Aluminum Co., Ltd., non-volatile content 65% by mass, D50 =
16 μm) 25 parts by mass was gradually added under a stirring environment and stirred for 20 minutes. Furthermore, 0.3 parts by mass of Florene AO-82 (Kyoeisha Chemical Co., Ltd. defoaming agent), 0.6 parts by mass of Polyflow KL-401 (Kyoeisha Chemical Co., Ltd. leveling agent), Disparon 6820-10M (Enomoto Kasei Co., Ltd. amide compound) (Non-Natural Spirit Dispersion, Non-volatile Content 10% by Mass) 5.0 parts by mass were added and stirred for 10 minutes to prepare Luminous Pigment Dispersion 1.

<Luminous pigment dispersions 2 to 8>
In the same manner as the method for preparing the bright pigment dispersion 1, the bright pigment dispersions 2 to 8 were prepared according to the formulation shown in Table 1.

(Note 1) Lumiflon LF800 (a mineral spirit solution of a hydroxyl group-containing fluororesin manufactured by Asahi Glass Co., Ltd., nonvolatile content 60 mass%, hydroxyl value 35 mg KOH / g of nonvolatile content)
(Note 2) Lumiflon LF200 (xylene solution of hydroxyl group-containing fluorine resin manufactured by Asahi Glass Co., Ltd., nonvolatile content 60 mass%, hydroxyl value 50 mg KOH / g of nonvolatile content)
(Note 3) Al paste 54-452 (non-leafing type aluminum paste manufactured by Toyo Aluminum Co., Ltd., non-volatile content 65% by mass, D50 = 37 μm)

<Coloring pigment dispersion 1>
Mineral Spirit 35 in 100 parts by mass of Hitaroid 6500B in the mixer
40 parts by mass, Aerosil AR-20, parts by mass, Daipyroxide TM Red 8270 (Red Iron Oxide (colored pigment) manufactured by Dainichi Seika Kogyo Co., Ltd., nonvolatile content: 100% by mass, D50 = 70 nm)
0 (Nippon Aerosil Co., Ltd. Silica, extender pigment) 1 part by mass was gradually added in a stirring environment.
The mixture was stirred for 1 minute and then kneaded for 1 hour using a paint conditioner. Furthermore, 0.3 parts by mass of Floren AO-82, 0.6 parts by mass of Polyflow KL-401, and 5.0 parts by mass of Disparon 6820-10M were added, and the mixture was stirred for 10 minutes to prepare a colored pigment dispersion 1.

<Coloring pigment dispersions 2 to 12>
In the same manner as the colored pigment dispersion 1, the colored pigment dispersions 2 to 12 according to the formulation shown in Table 2
Was prepared.

(Note 4) Dipyroxide TM Yellow 8170 (Yellow Seika Kogyo Co., Ltd. yellow iron oxide (color pigment), nonvolatile content 100% by mass, D50 = 70 nm)
(Note 5) Dipyroxide TM Blue 3490E (Cobalt blue pigment (colored pigment) manufactured by Dainichi Seika Kogyo Co., Ltd., nonvolatile content: 100% by mass, D50 = 50 nm)
(Note 6) Daipyroxide TM Black 3550 (complex oxide black pigment (colored pigment) manufactured by Dainichi Seika Kogyo Co., Ltd., nonvolatile content 100% by mass, D50 = 60 nm)
(* 7) IRGAZIN Red 179 (Condensed polycyclic compound red pigment manufactured by Ciba Specialty Chemicals, nonvolatile content 100% by mass, D50 = 60 nm)
(Note 8) Toda Color 130ED (red iron oxide (color pigment) manufactured by Toda Kogyo Co., Ltd., nonvolatile content 100
(Mass%, D50 = 160 nm)

<Concealment rate measurement resin solution 1>
Mineral Spirit 75 in 100 parts by mass of Hitaroid 6500B in the mixer
A mass part was added and stirred for 20 minutes. Furthermore, 0.3 parts by mass of Floren AO-82,
0.6 part by mass of Polyflow KL-401 was added and stirred for 10 minutes to prepare a resin solution 1 for measuring the concealment rate.
The compounding prescription of the concealment ratio measuring resin solution 1 is obtained by replacing the al paste and the compounding amount thereof in the compounding prescription of the bright pigment dispersions 1, 2, 3 and 6 with mineral spirits. Is used to measure the concealment rate when the scaly metal pigment is removed from the non-volatile content in the coating composition using the bright pigment dispersions 1, 2, 3 and 6.

<Concealing rate measurement resin solutions 2 to 4>
In the same manner as the concealing rate measuring resin solution 1, concealing rate measuring resin solutions 2 to 4 were prepared according to the formulation shown in Table 3. Here, the concealment rate measuring resin solution 2 is used to measure the concealment rate when the scaly metal pigment is removed from the nonvolatile content in the coating composition using the bright pigment dispersions 4 and 5. The measurement resin solution 3 is used for measuring the concealment rate when the scale-like metal pigment is removed from the nonvolatile content in the coating composition using the bright pigment dispersion 7,
The concealment rate measuring resin solution 4 is used for measuring the concealment rate when the scale-like metal pigment is removed from the non-volatile content in the coating composition using the bright pigment dispersion 8.

<Example 1>
50 parts by mass of the pigment pigment dispersion 1 was mixed with 50 parts by mass of the color pigment dispersion 1 to obtain a main agent. Further, Duranate TSA-100 (isocyanurate-modified product of hexamethylene diisocyanate manufactured by Asahi Kasei Chemicals Corporation, nonvolatile content: 100% by mass) as a curing agent 3.0
The paint of Example 1 was prepared by adding parts by weight. The non-volatile content in the coating composition is 4
5.2% by mass, PVC (pigment volume concentration) was 14.6% by volume, and the content of the scale-like metal pigment in the coating composition was 4.4% by mass. The results are shown in Table 4.
In addition, instead of the bright pigment dispersion 1 of Example 1, a coating composition for measuring the concealment ratio (paint of Example 1 ′) was prepared using the resin liquid 1 for concealment ratio measurement, and this was covered with black and white. The film was coated with a film applicator having a clearance of 100 μm on the rate test paper, and the concealment rate was measured. As a result, it was 3.9%. The results are shown in Table 6.

<Examples 2 to 17 and Comparative Examples 1 to 7>
Similar to the preparation method of Example 1 above, Examples 2 to 2 were carried out according to the formulation shown in Tables 4 to 5 below.
17. Paints of Comparative Examples 1 to 7 were prepared. In addition, the non-volatile content in the coating composition,
Tables 4 to 5 show the content of the scaly metal pigment in the PVC and the coating composition.
In the same manner as in Example 1 ′, the coating compositions for measuring the concealment ratio (Examples 2 ′ to 17 ′ and Comparative Examples 1 ′ to 7 ′) were applied according to the formulation shown in Tables 6 to 7 below. ) And the concealment rate was measured. The results are shown in Tables 6-7.

In Tables 4 to 7, “Takenate D-140N” refers to the following curing agent.
(Note 9) Takenate D-140N (Mitsui Chemicals' isophorone diisocyanate burette modified ethyl acetate solution, nonvolatile content 75 mass%)

Examples 1 to 17 and Comparative Examples 1 to 7 of painting workability, finished appearance and brightness, repaintability,
The weather resistance was measured and evaluated. The results are shown in Tables 4-5.

<Coating workability>
The coating composition prepared on the tin plate was applied with a short hair roller and evaluated according to the following criteria.
A: There is no problem in the painting work and it is very easy to paint.
○: There is no problem in the painting work.
(Triangle | delta): Drying is quick and skill is required for a painting operation.
X: Roller or brush is heavy or too light and difficult to paint.

<Finished appearance and brightness>
The coating composition prepared on the tin plate was applied with a short-hair roller, and the coated surface dried at room temperature for 24 hours was visually observed and evaluated according to the following criteria.
◯: Overall brightness and uniform finish.
X: There is no brightness on the whole, or there is unevenness in brightness, and the finish is not uniform.

<Repaintability>
The prepared coating composition was applied to each plate obtained by applying the following paint to a tin plate with a short-hair roller, and the paintability and finished appearance were evaluated.
1) Duraclon CW white (acrylic resin paint manufactured by Dainippon Paint Co., Ltd.)
2) Vinylose white (vinyl chloride resin paint made by Dainippon Paint Co., Ltd.)
○: No abnormality is observed on any of the plates.
Δ: The plate of 1) is not abnormal, but the plate of 2) is abnormal.
X: There is abnormality in any board.

<Weather resistance>
After the test plate was further dried at room temperature for 7 days, it was irradiated for 2000 hours under the conditions of JIS K5600-7-7 cycle A and evaluated according to the following criteria.
○: The gloss retention is 80% or more, and the color change cannot be recognized.
Δ: Gloss retention is 80% or more, but color change can be recognized.
X: Gloss retention is less than 80%.

Claims (8)

A coating composition comprising a scaly metal pigment and a colored pigment, wherein the scaly metal pigment is a non-leafing type aluminum pigment, and the content of nonvolatile content in the coating composition is 35 to 60% by mass And the coating composition whose pigment volume concentration in this non-volatile content is 10-25 volume%,
The concealment rate when the scale-like metal pigment is removed from the non-volatile content of the coating composition is 0.1 to 50%, and the concealment rate is measured according to JIS K-5600-4-1 Method B. A paint composition.   The coating composition according to claim 1, wherein the color pigment has a 50% volume average diameter in a range of 5 to 1000 nm.   The paint composition according to claim 1 or 2, wherein a ratio of the scale-like metal pigment to the pigment contained in the paint composition is 0.1 to 99.9% by mass.   The coating composition according to claim 1, wherein the colored pigment is an inorganic pigment.   Furthermore, the coating composition as described in any one of Claims 1-4 characterized by including the solvent in which the mixed aniline point or aniline point prescribed | regulated to JISK2256 exists in the range of 12-70 degreeC.   Furthermore, an amide compound is included, The coating composition as described in any one of Claims 1-5 characterized by the above-mentioned.   The manufacturing method of the coating body characterized by coating a building or a structure with the coating composition as described in any one of Claims 1-6.   It is equipped with the building or the structure, and the coating film formed on the building or the structure, The said coating film was formed from the coating composition as described in any one of Claims 1-6. Painted body.