JP2023126659A - Coating agent - Google Patents

Abstract

To provide a coating agent capable of forming a brilliant film by roller coating or the like.SOLUTION: There is provided a coating agent which comprises a resin component (A), a brilliant pigment (B) and a scaly powder (C) as an extender pigment, wherein the coating agent comprises 1 to 20 pts.wt. of the brilliant pigment (B) and 0.1 to 50 pts.wt. of the scaly powder (C) based on 100 pts.wt. of a solid content of the resin component (A) and preferably further comprises a coloring pigment (D).SELECTED DRAWING: None

Description

The present invention relates to a novel coating agent.

Conventionally, coating agents exhibiting glittering properties have been used for, for example, structures, buildings, vehicles, home appliances, and the like. Such a coating agent contains a glittering pigment, and in order to exhibit its glittering properties, the coating agent is generally applied by spraying.

For example, Patent Document 1 (Japanese Unexamined Patent Publication No. 2010-209276) states that when a coating agent containing a urethane resin, an organic solvent, a bright pigment, etc. is applied to an object by spray painting, the organic solvent evaporates and It is described that a film with excellent glitter can be formed by aligning the glitter pigment.

Japanese Patent Application Publication No. 2010-209276

However, when spray painting is performed as in Patent Document 1, scattering occurs to the surrounding area during painting, so careful curing is required before painting, and there is also a risk that material loss due to scattering may increase.

To solve this problem, there is a method of painting with a roller or the like. However, when a coating agent exhibiting glittering properties is applied with a roller, the finished area tends to be noticeable at the joints, and there is a risk that the glittering appearance may be impaired.

The present invention has been made in view of these points, and an object of the present invention is to provide a coating agent that can form a glittering film by roller coating or the like.

In order to solve these problems, the inventor of the present invention, as a result of intensive studies, came up with a coating agent containing a resin component, a bright pigment, and a scaly powder as an extender pigment in a specific ratio, and completed the present invention. It has arrived.

That is, the present invention has the following features.
1. A coating agent exhibiting glittering properties,
A resin component (A), a bright pigment (B), and a scaly powder (C) as an extender pigment,
It is characterized by containing 1 to 20 parts by weight of the glittering pigment (B) and 0.1 to 50 parts by weight of the scaly powder (C) based on 100 parts by weight of the solid content of the resin component (A). (excluding coating compositions containing matting agents, resin beads, and glittering materials) .
2. 1. characterized by further containing a coloring pigment (D); Coating agent as described.
3. 1. A glittering film can be formed by coating with a fibrous roller. Coating agent as described.

According to the present invention, a coating agent that can form a glittering film by roller coating or the like can be obtained.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated.

The coating agent of the present invention exhibits a glittering film formed thereon, and contains a resin component (A), a glittering pigment (B), and a scaly powder (C) as an extender pigment. .

Among these, examples of the resin component (A) include acrylic resins, polyester resins, polyether resins, polyurethane resins, acrylic silicone resins, fluorine resins, vinyl acetate resins, epoxy resins, and composite systems thereof. I can do it. These can be used alone or in combination of two or more. Examples of the form of the resin component (A) include water-based resins such as water-soluble resins and water-dispersible resins, non-aqueous resins such as solvent-soluble resins and non-water-dispersible resins, and solvent-free resins. . The glass transition temperature of the resin component (A) is preferably -20 to 80°C, more preferably -10 to 60°C. In the present invention, "a to b" has the same meaning as "a or more and b or less".

Among the resin components (A), the aqueous resin contains water as a medium. On the other hand, non-aqueous resins use non-aqueous solvents as a medium. Examples of non-aqueous solvents include aliphatic hydrocarbon solvents such as n-heptane, n-hexane, n-pentane, n-octane, n-nonane, n-decane, n-undecane, and n-dodecane, and methylcyclohexane. , alicyclic hydrocarbon solvents such as ethylcyclohexane, mixed solvents containing aliphatic hydrocarbons such as mineral spirits, petroleum solvents such as petroleum ether, petroleum naphtha, solvent naphtha, kerosene, isoparaffin solvents, alcohol solvents, etc. , ether-alcohol solvents, ether-based solvents, ester-based solvents, ether-ester-based solvents, ketone-based solvents, and the like. These can be used alone or in combination of two or more.

The resin component (A) in the present invention may have crosslinking reactivity. When the resin component (A) is a crosslinking reaction type resin, the strength, water resistance, weather resistance, adhesion, etc. of the coating can be improved. The crosslinking reaction type resin may be one that causes a crosslinking reaction by itself, or one that causes a crosslinking reaction by a crosslinking agent that is mixed separately. Such crosslinking reactivity is caused by, for example, hydroxyl groups and isocyanate groups, carbonyl groups and hydrazide groups, epoxy groups and amino groups, aldo groups and semicarbazide groups, keto groups and semicarbazide groups, alkoxyl groups, carboxyl groups and metal ions, and carboxyl groups. It can be provided by combining reactive functional groups such as a group and a carbodiimide group, a carboxyl group and an epoxy group, a carboxyl group and an aziridine group, and a carboxyl group and an oxazoline group. Among these, hydroxyl group-isocyanate group crosslinking reaction type resins are preferred.

Examples of the hydroxyl group-isocyanate group crosslinking reaction type resin include an embodiment containing a polyol compound and a polyisocyanate compound as the resin component (A). Both of these components can be reacted and cured during film formation to form a polyurethane resin film.

Among these, examples of the polyol compound include polyether polyol, polyester polyol, acrylic polyol, fluorine-containing polyol, polyisoprene polyol, carbonate polyol, etc., and one or more of these can be used. The hydroxyl value of the polyol compound is preferably 10 to 200 KOHmg/g, more preferably 20 to 100 KOHmg/g. The hydroxyl value is a value expressed by the number of mg of potassium hydroxide equivalent to the hydroxyl group contained in 1 g of resin solid content. Further, the weight average molecular weight of the polyol compound is preferably 10,000 to 150,000. The weight average molecular weight is a value obtained by measurement using gel permeation chromatography.

The polyisocyanate compound has two or more isocyanate groups in one molecule, and forms a film by crosslinking with the polyol compound. Examples of the polyisocyanate compound include toluene diisocyanate (TDI), 4,4-diphenylmethane diisocyanate (pure-MDI), polymeric MDI, xylylene diisocyanate (XDI), hexamethylene diisocyanate (HMDI), isophorone diisocyanate (IPDI), and water. Examples include doped XDI, hydrogenated MDI, etc., or derivatives thereof (for example, compounds obtained by urethanation reaction, allophanate reaction, isocyanurate reaction, etc.), and those having allophanate groups, allophanate groups and isocyanurate groups. You can also use what you have. These can be used alone or in combination of two or more.

The mixing ratio of the polyisocyanate compound may be set in consideration of the equivalent ratio of the isocyanate groups of the polyisocyanate compound to the hydroxyl groups of the polyol compound, that is, the NCO/OH ratio. The NCO/OH ratio is preferably between 0.6 and 1.4, more preferably between 0.8 and 1.2.

The glitter pigment (B) is a component that imparts glitter to the formed film. Examples of bright pigments include aluminum flake pigments such as aluminum flake pigments, vapor-deposited aluminum flake pigments, metal oxide-coated aluminum flake pigments, and colored aluminum flake pigments; metal oxide-coated mica pigments, metal oxide-coated synthetic mica pigments, Mica pigments such as metal-plated mica pigments; glass flake pigments such as metal-coated glass flake pigments, metal oxide-coated glass flake pigments, and metal-plated glass flake pigments; or titanium flake pigments, stainless steel flake pigments, and metal oxide-coated platelets. Examples include iron oxide, metal oxide-coated silica flake pigments, metal oxide-coated alumina flake pigments, and the like. These can be used alone or in combination of two or more. Among these, aluminum flake pigments are preferred as the glitter pigment (B). As the aluminum flake pigment, leafing type and/or non-leafing type can be used.

The average particle diameter of the bright pigment (B) is preferably 1 to 20 μm, more preferably 3 to 15 μm. In the present invention, by using the glitter pigment (B) having such an average particle diameter, it is possible to impart glitter while suppressing unevenness caused by transparency of the coating, thereby improving the aesthetic appearance. can. In addition, in the present invention, the average particle diameter is the median diameter (d50), that is, the value of 50% particle diameter on a volume basis determined from a normal distribution function, and can be measured using a laser diffraction particle size distribution measuring device. . The average thickness of the glitter pigment (B) is preferably 0.05 to 0.3 μm.

The bright pigment (B) preferably has a water surface diffusion area defined by JIS K5906:2009 of 10,000 to 50,000 cm ² /g, more preferably 15,000 to 45,000 cm ² /g, and even more preferably 16,000 to 40,000 cm ^{2 /g} . It is g. The use of the glittering pigment (B) having such physical properties is advantageous in terms of suppressing unevenness caused by transparency of the film, improving aesthetics, and the like.

The mixing ratio of the bright pigment (B) is 1 to 20 parts by weight, preferably 2 to 17 parts by weight, and more preferably 3 to 15 parts by weight based on 100 parts by weight of the solid content of the resin component (A). . When the mixing ratio of the glittering pigment (B) is at least the above-mentioned lower limit, glittering properties can be imparted to the formed film, and it is also possible to suppress unevenness due to transparency of the film and the like. When the mixing ratio of the bright pigment (B) is below the above upper limit, it is possible to obtain a finish in which the joint area is less noticeable during roller coating, etc., and the aesthetic appearance can be improved.

In the present invention, a scaly powder (C) is included as an extender pigment. In the present invention, by including this scaly powder (C) as an essential component, it is possible to make the joint parts during roller coating etc. less noticeable and to form a highly aesthetically pleasing coating that exhibits glitter. The mechanism of action is not limited to the following, but the scaly powder (C) can improve the orientation of the bright pigment (B) during film formation without inhibiting the brightness of the bright pigment (B). It is assumed that this is due to the promotion of

Specific examples of the scale-like powder (C) include talc, mica, kaolin, clay, etc., and baked products thereof, and these can be used alone or in combination of two or more. The average particle diameter of the scaly powder (C) is preferably 0.1 to 20 μm, more preferably 0.3 to 12 μm. By using the scale-like powder (C) having such an average particle diameter, the effects of the present invention can be stably obtained.

The mixing ratio of the scaly powder (C) is 0.1 to 50 parts by weight, preferably 0.3 to 30 parts by weight, more preferably 0.3 to 30 parts by weight, based on 100 parts by weight of the solid content of the resin component (A). The amount is 5 to 20 parts by weight, more preferably 1 to 15 parts by weight. By having the mixing ratio of the scale-like powder (C) equal to or higher than the above lower limit, it is possible to obtain a finish that makes the joints less noticeable during roller coating, etc., while imparting shine, and improves aesthetics. can. When the mixing ratio of the scale-like powder (C) is at most the above upper limit, a film exhibiting sufficient glitter can be formed, which is also suitable in terms of glossiness and the like.

The coating agent of the present invention may further contain a colored pigment (D) in addition to the above-mentioned components. In the present invention, by mixing the colored pigments (D), glitter coatings exhibiting various tones can be formed.

Coloring pigments (D) include, for example, inorganic chromatic pigments such as ferric oxide (bengara), yellow iron oxide, ultramarine, and cobalt green; azo-based, naphthol-based, pyrazolone-based, anthraquinone-based, perylene-based, and quinacridone. Organic chromatic pigments such as chromatic, disazo, isoindolinone, benzimidazole, phthalocyanine, and quinophthalone; carbon black, iron-manganese composite oxide, iron-copper-manganese composite oxide, iron-chromium-cobalt Examples include black pigments such as composite oxide, copper-chromium composite oxide, copper-manganese-chromium composite oxide, and black iron oxide; white pigments such as titanium oxide, zinc oxide, and alumina. By using one or more of these color pigments (D), the coating agent can be colored in a desired color tone.

The mixing ratio of the colored pigment (D) is preferably 0.01 to 20 parts by weight, more preferably 0.05 to 15 parts by weight, based on 100 parts by weight of the solid content of the resin component (A). When the mixing ratio of the coloring pigment (D) is equal to or higher than the above lower limit, it becomes possible to impart a desired color tone, form a variety of bright coatings ranging from light colors to dark colors, and prevent unevenness caused by transparency of the coating, etc. It is also advantageous in terms of suppression. When the mixing ratio of the color pigment (D) is at most the above upper limit, a film exhibiting sufficient glitter can be formed.

The coating agent of the present invention may contain extender pigments other than the scale-like powder (C). Examples of such extender pigments include heavy calcium carbonate, light calcium carbonate, kaolin, china clay, diatomaceous earth, hydrated fine silicic acid, barite powder, barium sulfate, precipitated barium sulfate, barium carbonate, magnesium carbonate, silica powder, Examples include aluminum hydroxide, sepiolite, montrollilonite, wollastonite, and attapulgite. These can be used alone or in combination of two or more.

As the extender pigment, for example, acicular powders such as sepiolite, montrorillonite, wollastonite, and attapulgite are suitable. By mixing such acicular powder, it is possible to improve the shine, the finish of the joint area, and the like. It is thought that such acicular powder acts to assist the orientation of the glitter pigment (B).

The mixing ratio of the acicular powder is preferably 0.1 to 20 parts by weight, preferably 0.5 to 13 parts by weight, more preferably 1 to 13 parts by weight, based on 100 parts by weight of the solid content of the resin component (A). It is 10 parts by weight.

The coating agent of the present invention can contain a thickener. Examples of the thickener include organic bentonite, finely divided silica, surface-treated calcium carbonate, amide wax, hydrogenated castor oil wax, benzylidene sorbitol, metal soap, polyethylene oxide, polymerized vegetable oil, and polycarboxylic acid amine salt. These can be used alone or in combination of two or more. In the present invention, it is desirable to include oxidized polyethylene from the viewpoints of improving glitter, improving finish of joint areas, etc.

The mixing ratio of the thickener is preferably 0.01 to 10 parts by weight, more preferably 0.05 to 5 parts by weight in terms of solid content, based on 100 parts by weight of the solid content of resin component (A).

The coating agent of the present invention may contain various additives other than the above-mentioned components, as long as the effects of the present invention are not significantly impaired. Examples of such additives include leveling agents, film-forming aids, antifreeze agents, pH adjusters, wetting agents, plasticizers, preservatives, fungicides, algaecides, antibacterial agents, dispersants, and disinfectants. Examples include foaming agents, adsorbents, crosslinking agents, ultraviolet absorbers, light stabilizers, antioxidants, anti-staining agents, hydrophilic agents, water repellents, catalysts, and solvents. The coating agent of the present invention can be produced by uniformly mixing the above components and, if necessary, such additives by a conventional method. The form of the coating agent can be, for example, a one-part type, a two-part type, or a multi-part type.

The heating residue of the coating agent of the present invention is preferably 60% by weight or less, more preferably 30 to 60% by weight, still more preferably 40 to 55% by weight. When the heating residue is at least the above lower limit, it is suitable for suppressing the film from showing through, suppressing the occurrence of unevenness, and improving the aesthetic appearance. When the heating residue is below the above-mentioned upper limit, the viscosity of the coating agent can be easily adjusted, and the finish of the joint area can be improved. Note that the heating residue is a value measured by the method of JIS K5601-1-2, the heating temperature is 105° C., and the heating time is 60 minutes.

The pigment volume concentration of the coating agent of the present invention is preferably 15% or less, more preferably 3 to 10%, and even more preferably 5 to 9.8%. By setting the pigment volume concentration within such a range, the effects of the present invention can be fully obtained. Note that the pigment volume concentration is the volume percentage of the pigment contained in the dry coating, and is a value calculated from the mixed amount of the resin component and pigment that constitute the coating agent.

In applying the coating agent of the present invention, known painting equipment can be used. As the painting tool, for example, a spray, a roller, a brush, etc. can be used. The coating agent of the present invention is particularly suitable for roller coating. As the roller, a fibrous roller such as a wool roller can be used, and the hair length thereof is preferably 20 mm or less, more preferably 2 to 10 mm.

The coating amount of the coating agent of the present invention (per coating) is preferably 0.02 to 0.5 kg/m ² , more preferably 0.03 to 0.3 kg/m ² . With such a coating amount, it is possible to improve the shine, the finish of the joint area, and the like.

In the present invention, the first coating is performed with the above coating amount, and after the film dries, the second and subsequent coatings are repeatedly performed with the above coating amount, so that the coating agent can be coated over and over again. At the time of painting, the coating agent can be appropriately diluted with a solvent, etc., and it is desirable to set the heating residue to be within the above range.

In the present invention, a transparent protective layer can be provided after application of the coating agent, if necessary. By providing a transparent protective layer, weather resistance, durability, etc. can be improved. Such a transparent protective layer can be formed using, for example, a transparent coating agent containing acrylic resin, urethane resin, acrylic silicone resin, fluororesin, or the like as a binder. The transparent coating agent may be water-based or solvent-based, matte type or glossy type, and may be colored as long as it does not impede the effects of the present invention.

Various methods can be used to apply the transparent coating agent, such as brush coating, spray coating, and roller coating. The coating amount (per one coating) is preferably 0.02 to 0.3 kg/m ² , more preferably 0.05 to 0.15 kg/m ² . It is also possible to apply the first coat with such a coating amount, and after the film dries, to repeat the second and subsequent coatings with the same coating amount, thereby applying the transparent coating agent over and over again.

Examples and comparative examples are shown below to clarify the characteristics of the present invention.

(Manufacture of coating agent)
A base resin is produced by mixing and stirring resin component 1, a bright pigment, a powder, a coloring pigment, a thickener, and a solvent in a conventional manner.Resin component 2 is mixed therein as a hardening agent, and then a solvent is added. Each coating agent (heating residue: 45% by weight) was manufactured by mixing. Table 1 shows the formulation (in terms of solid content) of each coating agent. The following materials were used as raw materials.

・Resin component 1: Acrylic polyol dispersion (hydroxyl value: 40 KOHmg/g, weight average molecular weight: 70,000, solid content: 50% by weight, medium: mineral spirit)
・Resin component 2: Polyisocyanate compound (hexamethylene diisocyanate derivative, solid content: 100% by weight)
・Glitter pigment 1: Non-leafing aluminum flake pigment (average particle size: 9 μm, water surface diffusion area: 28000 cm ² /g)
・Glitter pigment 2: Non-leafing aluminum flake pigment (average particle size: 9 μm, water surface diffusion area: 29500 cm ² /g)
・Glitter pigment 3: Non-leafing aluminum flake pigment (average particle size: 12 μm, water surface diffusion area: 21000 cm ² /g)
・Glitter pigment 4: Non-leafing aluminum flake pigment (average particle size: 20 μm, water surface diffusion area: 14000 cm ² /g)
・Scaly powder 1: Talc (average particle size: 5 μm)
・Scaly powder 2: Calcined kaolin (average particle size: 0.6 μm)
・Granular powder 1: Silica (average particle size: 3 μm)
・Coloring pigment: carbon black ・Thickener: amide wax thickener, polyethylene oxide thickener ・Solvent: Mineral spirit

(Test method)
Each coating agent was applied to a sealer-treated plywood (60 cm x 60 cm) using a wool roller (hair length 6 mm) at a coating amount of 0.1 kg/m ² and dried for 16 hours. At this time, the plywood was installed vertically. Further, the coating was carried out by randomly rolling a roller impregnated with a coating agent to distribute the material, and then for finishing by rolling the roller in the same direction. Coating and drying were performed under standard conditions (temperature 23° C., relative humidity 50%).

The appearance of the test plate obtained by the above method (overall brightness and inconspicuousness of the painted joint) was evaluated. The overall brightness (evaluation 1) was evaluated on a four-level scale (excellent: AA>A>B>C: poor) with "AA" indicating high brightness. The inconspicuousness of the painted joint portion (evaluation 2) was evaluated on a four-level scale (excellent: AA>A>B>C: poor) with "AA" indicating less noticeable.

(Test results)
The test results are shown in Table 1. In Examples 1 to 8 (especially Examples 1 to 5), good results were obtained in each test.

Claims (3)

A coating agent exhibiting glittering properties,
A resin component (A), a bright pigment (B), and a scaly powder (C) as an extender pigment,
It is characterized by containing 1 to 20 parts by weight of the glittering pigment (B) and 0.1 to 50 parts by weight of the scaly powder (C) based on 100 parts by weight of the solid content of the resin component (A). (excluding coating compositions containing matting agents, resin beads, and glittering materials) . The coating agent according to claim 1, further comprising a colored pigment (D). The coating agent according to claim 1, wherein a glittering film can be formed by coating with a fibrous roller.