JP2019014812A - Coloration coating agent - Google Patents

Abstract

To provide a coloration coating agent that shows stably recoating suitability and enables a colored finish with excellent beauty.SOLUTION: A coloration coating agent contains an oxidation curable resin (A), a pigment (B), a metal dryer (C), and an aliphatic hydrocarbon-containing nonaqueous solvent (D). The pigment (B) contains surface-treated rutile titanium oxide (B-1), and a coloring pigment (B-2) other than the (B-1). Based on solid content 100 g of the oxidation curable resin (A), the pigment (B) has a total amount of oil absorption of 60 g or less.SELECTED DRAWING: None

Description

  The present invention relates to a novel colored coating agent.

  2. Description of the Related Art Conventionally, in buildings, civil engineering structures, and the like, color finishing with various coating agents has been performed for the purpose of protecting the base material and improving aesthetics. In recent years, in the field of coating agents, the use of aromatic hydrocarbon solvents such as toluene and xylene has been reduced in consideration of safety during painting, occupational hygiene, and effects on air pollution. The movement is getting stronger. In order to cope with such a movement, various environment-friendly coating agents using an aliphatic hydrocarbon solvent have been proposed.

  As such an environment-friendly coating agent, one using an oxidation-curable resin is known. For example, Japanese Patent Application Laid-Open No. 2004-352764 (Patent Document 1) describes a coating agent containing a resin component derived from an unsaturated fatty acid, a metal dryer, specific titanium oxide, and the like. The coating agent described in this publication causes a crosslinking reaction by oxidation of reactive double bonds contained in unsaturated fatty acid, and a metal dryer is used as a curing catalyst.

JP 2004-352664 A

  In the coating agent as described above, various colors can be imparted by mixing chromatic or black colored pigments in addition to the white pigment. When performing color finishing with such a colored coating agent, concealment properties etc. are likely to be insufficient with a single coating, so it may be finished by overcoating twice or more, but problems such as lifting occur during overcoating , There is a risk of affecting the finish. In addition, when the formed colored finish film is soiled or damaged, repair may be performed by overcoating, but the same problem may occur in this case.

  This invention is made | formed in view of such a point, and it aims at providing the coloring coating agent which shows the stable recoating suitability and can perform the coloring finish excellent in aesthetics.

  In order to solve such problems, the present inventors, as a result of intensive studies, suppress the occurrence of the above-described problems during overcoating and develop a composition of the pigment component in order to develop stable overcoating suitability. As a result, the present inventors have completed the present invention.

  That is, the present invention has the following characteristics.

1. A coloring coating agent comprising an oxidation curable resin (A), a pigment (B), a metal dryer (C), and an aliphatic hydrocarbon-containing nonaqueous solvent (D),
As the pigment (B), a surface-treated rutile type titanium oxide (B-1) and a colored pigment (B-2) other than the (B-1),
A coloring coating agent, wherein the total oil absorption amount of the pigment (B) is 60 g or less when the solid content of the oxidation-curable resin (A) is 100 g.
2. The surface-treated rutile type titanium oxide (B-1) has an oil absorption of 30 g / 100 g or less. The coloring coating agent as described.

  ADVANTAGE OF THE INVENTION According to this invention, the coloring coating agent which shows the stable recoating suitability and can perform the coloring finish excellent in aesthetics is obtained.

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

  The colored coating agent of the present invention contains an oxidation curable resin (A), a pigment (B), a metal dryer (C), and an aliphatic hydrocarbon-containing nonaqueous solvent (D).

  In the colored coating agent of the present invention, an oxidation curable resin (A) (hereinafter also referred to as “component (A)”) is used as a resin component. The component (A) in the present invention is air-oxidized and cured and dried by a double bond (oxidative polymerizable group) capable of oxidative polymerization. The component (A) is not particularly limited as long as it has an oxidative polymerizable group, but specifically, the following resins can be used.

1) A resin obtained by copolymerizing a vinyl monomer having an oxidative polymerizable group and another vinyl monomer copolymerizable with this monomer.
2) After copolymerizing an epoxy group-containing vinyl monomer and another vinyl monomer copolymerizable with this monomer, an unsaturated fatty acid is added to the epoxy group-containing vinyl monomer. Obtained resin.
3) A resin obtained by copolymerizing and / or graft-polymerizing a vinyl monomer having an oxidative polymerizable group and / or another vinyl monomer copolymerizable with this monomer into an alkyd resin.

  Examples of the vinyl monomer having an oxidatively polymerizable group in the above 1) and 3) include a vinyl monomer obtained by adding an unsaturated fatty acid to an epoxy group-containing vinyl monomer. This vinyl monomer is obtained by a reaction between an epoxy group and a carboxyl group in an unsaturated fatty acid. The resin 2) is obtained by an addition reaction of an unsaturated fatty acid to an epoxy group in the resin. When the epoxy group and the unsaturated fatty acid are reacted, a catalyst such as a tertiary amine or a quaternary ammonium salt can be used.

  Specific examples of the epoxy group-containing vinyl monomer include glycidyl (meth) acrylate, β-methylglycidyl (meth) acrylate, 3,4-oxycyclohexylpropyl (meth) acrylate, and allyl glycidyl ether. These can be used alone or in combination of two or more.

  Examples of unsaturated fatty acids include linseed oil fatty acid, tung oil fatty acid, fish oil fatty acid, dehydrated castor oil fatty acid, soybean oil fatty acid, sesame oil fatty acid, poppy oil fatty acid, eno oil fatty acid, safflower oil fatty acid, hemp seed oil fatty acid, grape kernel oil Fatty acids, tall oil fatty acids, sunflower oil fatty acids, cottonseed oil fatty acids, corn oil fatty acids, walnut oil fatty acids and the like. These can be used alone or in combination of two or more. The component ratio of the unsaturated fatty acid in the component (A) is preferably 0.5 to 30% by weight, more preferably 1 to 25% by weight from the viewpoints of curability, suitability for repeated coating, and the like. In the present invention, “ab” has the same meaning as “a to b”.

  Examples of the vinyl monomer having an oxidative polymerizable group in the above 1) and 3) include dicyclopentadieneoxyalkyl group-containing vinyl monomers such as dicyclopentadieneoxyalkyl (meth) acrylate, and allyl (meth) acrylate. An allyl group-containing vinyl monomer such as can also be used. These can be used alone or in combination of two or more.

  As the alkyd resin in the above 3), those obtained by polycondensation of polyhydric alcohol and polycarboxylic acid and modified with drying oil, unsaturated fatty acid or the like can be used. Among these, examples of the polyhydric alcohol include ethylene glycol, glycerin, and pentaerythritol, and examples of the polyvalent carboxylic acid include phthalic anhydride and maleic anhydride. Examples of the drying oil include linseed oil, tung oil, sika deer oil, safflower oil, and the like.

  Examples of other vinyl monomers in the above 1) to 3) include (meth) acrylic acid alkyl esters, aromatic monomers and the like. Among these, specific examples of alkyl (meth) acrylates include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, n -Amyl (meth) acrylate, isoamyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, octadecyl (meth) ) Acrylate, cyclohexyl (meth) acrylate and the like. Specific examples of the aromatic monomer include styrene, 2-methylstyrene, vinyltoluene, t-butylstyrene, chlorostyrene, vinylanisole, vinylnaphthalene, divinylbenzene and the like. These can be used alone or in combination of two or more. As such a vinyl monomer, for example, a carboxyl group-containing vinyl monomer, an amino group-containing vinyl monomer, a hydroxyl group-containing vinyl monomer, and the like can be used. As the component (A), as other monomers, at least (meth) acrylic acid alkyl ester copolymerized, (meth) acrylic acid alkyl ester and aromatic monomer copolymerized, etc. Is preferred.

  The acid value of the component (A) is preferably from 0.3 to 30 mgKOH / g, more preferably from 0.5 to 20 mgKOH / g, from the viewpoints of improving the pigment miscibility and improving the finish at the time of overcoating. is there. In addition, an acid value is a value represented by the number of mg of potassium hydroxide equimolar with the acid group contained in 1g of solid content of (A) component. In order to set the acid value of the component (A) within the above range, a carboxyl group-containing vinyl monomer may be used as the other vinyl monomer in the above 1) to 3). Examples of the carboxyl group-containing vinyl monomer include acrylic acid, methacrylic acid, crotonic acid, maleic acid or a monoalkyl ester thereof, itaconic acid or a monoalkyl ester thereof, fumaric acid or a monoalkyl ester thereof. These can be used alone or in combination of two or more.

  As (A) component in this invention, what modified | denatured the above-mentioned resin with an isocyanate compound, a urethane compound, a silicone compound, an alkoxysilane compound etc. can be used, for example.

  The form of component (A) may be either a solvent-soluble form or a non-aqueous dispersion form. In the present invention, both forms of resins can be used in combination.

  (A) The weight average molecular weight of a component becomes like this. Preferably it is 10,000-500000, More preferably, it is 20000-300000. The glass transition point of the component (A) is preferably −5 ° C. to 70 ° C., more preferably 10 ° C. to 60 ° C.

  The pigment (B) (hereinafter also referred to as “component (B)”) is a component that imparts various colors to the colored coating agent of the present invention and further conceals the color.

  In the present invention, as the pigment (B), at least a surface-treated rutile type titanium oxide (B-1) (hereinafter also referred to as “component (B-1)”) and a coloring pigment other than the (B-1) (B -2) (hereinafter also referred to as “component (B-2)”). The total oil absorption amount of the pigment (B) (based on the solid content of 100 g of the oxidative curable resin (A)) is set to 60 g or less. In the present invention, since the pigment (B) has such a configuration that satisfies such conditions, a stable overcoating suitability is exhibited, and a colored finish with excellent aesthetics is possible.

  The reason why such an effect is achieved is not clear, but titanium oxide has a property of generating radicals, and the radicals act on the oxidatively polymerizable group of the oxidatively curable resin (A) to form a metal dryer (C ) May be hindered. On the other hand, if the total oil absorption amount of the pigment (B) is too large, the metal dryer (C) is likely to be adsorbed on the pigment (B), which may promote the action of the radical. Thus, the radical derived from titanium oxide is considered to inhibit the curing mechanism of the metal dryer (C).

  In contrast, in the present invention, when the pigment (B) satisfies the above-described conditions, radical generation derived from titanium oxide is suppressed, and curing by the metal dryer (C) proceeds stably. Thereby, lifting during overcoating is suppressed, suitability for overcoating is improved, and a colored finish state having excellent aesthetics can be obtained.

The surface-treated rutile type titanium oxide (B-1) plays a role as a white pigment and contributes to suitability for overcoating. In the untreated rutile type titanium oxide or anatase type titanium oxide, the curing by the metal dryer (C) is hindered, the lifting tends to occur, and the suitability for overcoating becomes insufficient. In the present invention, the titanium oxide may be substantially composed of TiO ₂ as a main component, and some impurities (for example, antimony oxide, niobium oxide, potassium oxide, phosphorus oxide, sulfur oxide, etc.) May be included.

  As the component (B-1), one in which the surface of rutile titanium oxide particles is surface-treated with at least an inorganic compound can be used. Examples of the inorganic compound used for the surface treatment include silica, alumina, zirconia, titania, tin oxide, antimony oxide, and zinc oxide. Among these, one kind selected from the group consisting of silica, alumina, and zirconia. Or the aspect containing 2 or more types is suitable. In addition to this, as the inorganic compound, for example, a compound containing phosphorus, calcium, magnesium, strontium, barium, or the like may be included. Such a surface treatment with an inorganic compound can be performed by a known method. For example, an aqueous salt solution such as Si, Al, Zr, Ti, Sn, Sb, Zn or the like is added to a slurry containing titanium oxide, A method of performing a process such as filtration, drying, and pulverization after adding a hydrating alkali or acid to form a hydrous oxide on the surface of the titanium oxide particles can be employed.

  In addition to the inorganic compound, the component (B-1) may be surface-treated with an organic compound. Examples of organic compounds used for the surface treatment include fatty acids, fatty acid esters, surfactants, metal soaps, silicone resins, fluororesins, acrylic resins, polyester resins, silane coupling agents, titanium coupling agents, and waxes. It is done. These can be used alone or in combination of two or more. Such a surface treatment with an organic compound can be performed by a known method. For example, a method of adding and mixing an organic compound before or after drying the surface treatment method with an inorganic compound can be employed.

  The oil absorption amount of the component (B-1) is preferably 30 g / 100 g or less. With such an oil absorption amount, the surface of the titanium oxide particles tends to be in a state where the surface is densely treated with the inorganic compound or the like, which is advantageous in suppressing radical generation, and is preferable in terms of improving the effect of the present invention. . The lower limit of the oil absorption amount of the component (B-1) is not particularly limited, but is preferably 5 g / 100 g or more. The oil absorption is a value measured by the method of JIS K5101-13-2: 2004.

(B-1) TiO ₂ content of the component is preferably 95% or less, more preferably 90% or less, more preferably from 80 to 89%. If the TiO ₂ content of the component (B-1) is within such a range, the surface treatment tends to be thicker, which is advantageous for suppressing radical generation, and is suitable for improving the effect of the present invention. is there. The TiO ₂ content is a value (mass fraction) measured according to JIS K5116: 2004 7.2.

  In the present invention, it is possible to express various colors by including the color pigment (B-2). As the component (B-2), chromatic pigments, black pigments and the like can be used. Among these, chromatic pigments are pigments that exhibit chromatic colors such as yellow, orange, red, green, blue, and purple. As such chromatic pigments, for example, inorganic ones such as ferric oxide, hydrous ferric oxide, ultramarine, cobalt blue, cobalt green, azo, naphthol, pyrazolone, anthraquinone, perylene, Examples thereof include organic substances such as quinacridone, disazo, isoindolinone, benzimidazole, phthalocyanine, and quinophthalone. On the other hand, the black pigment is a pigment exhibiting black color, such as iron black, iron-manganese composite oxide, iron-copper-manganese composite oxide, iron-chromium-cobalt composite oxide, copper-chromium composite oxide, Examples thereof include inorganic materials such as copper-manganese-chromium composite oxide, and other carbon blacks. In addition, as the component (B-2), for example, white pigments such as zinc oxide and aluminum oxide can also be used. These can be used alone or in combination of two or more.

  In the present invention, extender pigment (B-3) (hereinafter also referred to as “component (B-3)”) can be mixed as component (B). Examples of the component (B-3) include heavy calcium carbonate, light calcium carbonate, kaolin, clay, porcelain clay, china clay, diatomaceous earth, hydrous finely divided silicic acid, talc, barite powder, barium sulfate, precipitated barium sulfate, and carbonate. Examples include barium, magnesium carbonate, silica powder, and aluminum hydroxide. These can be used alone or in combination of two or more. The component (B-3) can be used for the purpose of, for example, solid content adjustment, viscosity adjustment, gloss adjustment (such as gloss reduction), and the like.

  In the present invention, the total oil absorption amount of the component (B) (hereinafter also simply referred to as “total oil absorption amount”) based on the solid content of 100 g of the component (A) is 60 g or less, preferably 55 g or less. (B) Although the minimum of the total oil absorption of a component is not specifically limited, Preferably it is 3 g or more, More preferably, it is 5 g or more. If the lower limit of the total oil absorption is such a value, it is preferable in terms of imparting viscosity, coating workability, and the like. The total oil absorption amount of the component (B) can be set, for example, by adjusting the oil absorption amount, mixing ratio, etc. of each component (B) used.

In the present invention, the total oil absorption amount of the component (B) is the amount (g) of boiled linseed oil absorbed by the component (B), based on the solid content of 100 g of the component (A). Specifically, when m types (m is an integer) represented by (B ₁ ), (B ₂ ),... (B _m ) are used as component (B), the total oil absorption amount of component (B) Is calculated by the following equation.
(B) Total oil absorption amount of component =
[{Oil absorption amount of (B ₁ )} × {g number of (B ₁ ) based on 100 g of solid content of component (A)} / 100] +
[{Oil absorption amount of (B ₂ )} × {g number of (B ₂ ) based on 100 g of solid content of component (A)} / 100] +.
[{Oil absorption amount of (B _m )} × {g number of (B _m ) based on 100 g of solid content of component (A)} / 100]

  The mixing ratio of the component (B) in the colored coating agent of the present invention may be set within a range in which the total oil absorption satisfies the above range, but the component (B-1) has a solid content of 100 weight of the component (A). The amount is preferably 5 to 150 parts by weight, more preferably 10 to 120 parts by weight with respect to parts. The component (B-2) is preferably 0.1 to 100 parts by weight and more preferably 0.3 to 90 parts by weight with respect to 100 parts by weight of the solid content of the component (A). When the component (B-3) is used, the component (B-3) is preferably 50 parts by weight or less, and 1 to 40 parts by weight with respect to 100 parts by weight of the solid content of the component (A). Is more preferable.

  The metal dryer (C) (hereinafter also referred to as “component (C)”) is a component that serves as a curing catalyst for the oxidation-curable resin (A). Examples of the component (C) include organometallic compounds containing metals such as cobalt, manganese, vanadium, cerium, iron, tin, zirconium, bismuth, aluminum, strontium, zinc, barium, copper, calcium, lead, and nickel (for example, Octylate, naphthenate, etc.) can be used. Specific examples of the component (C) include, for example, cobalt octylate, cobalt naphthenate, manganese octylate, manganese naphthenate, iron octylate, iron naphthenate, tin octylate, tin naphthenate, zirconium octylate, and naphthenic acid. Zirconium, zinc octylate, zinc naphthenate, barium octylate, barium naphthenate, copper octylate, copper naphthenate, calcium octylate, calcium naphthenate and the like can be mentioned. These can be used alone or in combination of two or more.

  In the present invention, as the component (C), a metal dryer (C-1) containing one or more metals selected from the group consisting of cobalt, manganese, vanadium, cerium, and iron (hereinafter referred to as “(C-1) component”). And a metal dryer (C-2) containing one or more metals selected from the group consisting of zirconium, bismuth, aluminum, strontium, zinc, barium, copper, and calcium (hereinafter referred to as “(C-2) component”) It is desirable to include. When such (C-1) component and (C-2) component are included, it is suitable at the point of effect improvement, such as sclerosis | hardenability, lifting resistance, and recoating suitability. The weight ratio {(C-1) :( C-2)} between the component (C-1) and the component (C-2) is preferably 1:99 to 50:50, more preferably, in terms of metal content. 2: 98-40: 60.

  The mixing ratio of the component (C) is preferably 0.001 to 5 parts by weight, and more preferably 0.01 to 3 parts by weight, in terms of metal content, with respect to 100 parts by weight of the solid content of the component (A). If component (C) is such a mixing ratio, it is suitable in terms of curability, lifting resistance, suitability for overcoating, and the like.

  The colored coating agent of the present invention is a so-called weak solvent type material containing an aliphatic hydrocarbon-containing non-aqueous solvent (D) (hereinafter also referred to as “component (D)”) as a medium. Such a component (D) is a non-aqueous solvent that is less toxic than toluene, xylene, etc., has high work safety, and has little influence on air pollution. Examples of the aliphatic hydrocarbon include n-hexane, n-pentane, n-octane, n-nonane, n-decane, n-undecane, and n-dodecane. These can be used alone or in combination of two or more. In the present invention, aliphatic hydrocarbons can be introduced by using a mixed solvent such as mineral spirits. The aliphatic hydrocarbon is preferably contained in an amount of 5% by weight or more, more preferably 10 to 80% by weight, based on the total amount of the component (D).

  (D) A component may contain the solvent which can be mixed with an aliphatic hydrocarbon. Examples of such solvents include petroleum solvents such as petroleum ether, petroleum naphtha, and solvent naphtha, and ethyl acetate, butyl acetate, methyl ethyl ketone, and methyl isobutyl ketone. Suitable solvents include, for example, mixed aniline. Examples thereof include petroleum solvents (aromatic hydrocarbon-containing petroleum mixed solvents) having a point or aniline point of 12 to 70 ° C. The mixed aniline point or aniline point is a value measured by the method of JIS K2256: 2013.

  The mixing ratio of the component (D) is preferably 100 to 300 parts by weight, more preferably 120 to 250 parts per 100 parts by weight of the solid content of the component (A) from the viewpoints of workability and finishability during overcoating. Parts by weight. In addition, the solvent used as a medium of each component is also included in (D) component.

  In addition to the above-described components, the colored coating agent of the present invention may contain various components to the extent that the effects of the present invention are not affected. Examples of such components include plasticizers, antiseptics, antifungal agents, algae inhibitors, antifoaming agents, leveling agents, pigment dispersants, thickeners, antiskinning agents, dehydrating agents, matting agents, Examples include ultraviolet absorbers, light stabilizers, antioxidants, and catalysts. Moreover, you may contain resin components other than the said (A) component. The colored coating agent of the present invention can be produced by uniformly stirring and mixing the above components (A) to (D) and, if necessary, each of such components by a conventional method.

  The colored coating agent of the present invention can be applied mainly to buildings, civil engineering structures and the like. Examples of the base material constituting such a part include concrete, mortar, siding board, extrusion board, gypsum board, perlite board, wood board, plastic board, metal board, and the like. These base materials may have been subjected to some surface treatment (filler treatment, putty treatment, surfacer treatment, sealer treatment, etc.), or have already been formed with a coating film. The colored coating agent of the present invention is particularly suitable under conditions where titanium oxide is likely to generate radicals, for example, for outdoor use where it is susceptible to sunlight. The colored coating agent of the present invention is desirably used in a one-pack type.

  The colored coating agent of the present invention can be diluted during painting. As the diluent, the component (D) is preferable, and it is desirable to dilute the component within the range in which the total amount of the component (D) after dilution satisfies the mixing ratio.

As the coating method, for example, various methods such as brush coating, roller coating, and spray coating can be employed. Dabs amount during painting, once per coating, preferably 30 to 250 g / ^{m 2,} more preferably 50 to 200 g / ^{m 2.} In the present invention, after the coating is once performed and the coating film has dried, the next coating (overcoating) may be performed. The drying temperature is preferably −10 to 50 ° C., more preferably −5 to 40 ° C. The number of times of coating is preferably 2 times or more.

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

(Manufacture of colored coating agent)
Each component was uniformly mixed at a weight ratio shown in Table 1 by a conventional method to produce each colored coating agent. In addition, the used component is as follows.

Resin 1: Oxidation-curable resin (resin component: alkyl methacrylate, alkyl acrylate, styrene / glycidyl methacrylate copolymer modified with soybean oil fatty acid, non-water-dispersed resin using mineral spirit as medium, unsaturated Fatty acid composition ratio: 10% by weight, acid value: 2 mgKOH / g, solid content: 50% by weight)
Resin 2: Oxidation-curing resin (resin component: alkyl methacrylate, alkyl acrylate, styrene / glycidyl methacrylate copolymer modified with soybean oil fatty acid, non-water-dispersed resin using mineral spirit as medium, unsaturated Fatty acid composition ratio: 10% by weight, acid value: 0.2 mgKOH / g, solid content: 50% by weight)
Titanium oxide 1: surface-treated rutile type titanium oxide (oil absorption amount: 24 g / 100 g, TiO ₂ content: 93%, surface treatment compound: silica, alumina, zirconia)
Titanium oxide 2: surface-treated rutile type titanium oxide (oil absorption amount: 22 g / 100 g, TiO ₂ content: 87%, surface treatment compound: silica, alumina, zirconia, organic compound)
Titanium oxide 3: surface-treated rutile type titanium oxide (oil absorption amount: 33 g / 100 g, TiO ₂ content: 88%, surface treatment compound: silica, alumina)
Titanium oxide 4: Untreated rutile type titanium oxide (oil absorption: 17 g / 100 g, TiO ₂ content: 99%)
Titanium oxide 5: anatase type titanium oxide (oil absorption: 23 g / 100 g, TiO ₂ content: 99%)
Coloring pigment 1: Black pigment (carbon black, oil absorption: 98 g / 100 g)
Coloring pigment 2: yellow pigment (hydrous ferric oxide, oil absorption: 30 g / 100 g)
Coloring pigment 3: red pigment (ferric oxide, oil absorption: 25 g / 100 g)
Coloring pigment 4: Blue pigment (copper phthalocyanine blue, oil absorption: 35 g / 100 g)
-Extender pigment 1: extender pigment (hydrous fine powdered silicic acid, oil absorption: 250 g / 100 g)
Metal dryer 1: Mineral spirit solution of cobalt naphthenate Metal dryer 2: Mineral spirit solution of zirconium naphthenate Dispersant: Acrylic dispersant Thickener: Amide wax thickener Antifoam: Mineral oil Antifoaming agent / solvent: Non-aqueous solvent containing aliphatic hydrocarbon (mixture of mineral spirits and petroleum mixed solvent containing aromatic hydrocarbon, aliphatic hydrocarbon content ratio: 65% by weight)

(Test method)
The following tests were carried out for each colored coating agent.

・ Replacability 1
A colored coating agent was spray-coated at a coating amount of 100 g / m ² on a slate plate previously coated with an epoxy resin primer. During the day, after drying and curing for a predetermined time (48 hours, 72 hours) in a room receiving sunlight, the same colored coating agent was partially overcoated at a coating amount of 100 g / m ² using a brush. Observe the surface condition of the coating film at this time, "a" if the lifting phenomenon was not recognized, "b" if the slight lifting phenomenon was recognized, and those where the mild lifting phenomenon was observed Evaluation was performed in four stages (a>b>c> d, practical level is a to c) where “c”, where a lifting phenomenon was clearly observed, was “d”. The results are shown in Table 1.

-Overcoat suitability 2
A colored coating agent was spray-coated at a coating amount of 100 g / m ² on a slate plate previously coated with an epoxy resin primer. During the day, after drying and curing for 48 hours in a room receiving sunlight, the same colored coating agent was partially overcoated at a coating amount of 100 g / m ² using a brush. After leaving this test body for 48 hours, the color difference (ΔE) between the spray-coated region and the brush-coated region was measured with a color difference meter. The evaluation criteria are “a” for those with less than ΔE0.5, “b” for those with ΔE of 0.5 to less than 1.0, “c” for those with ΔE of 1.0 to less than 1.5, and ΔE1. .5 or higher was designated as “d” (practical level was a to c). The results are shown in Table 1. In addition, about Comparative Examples 1-4, since it was a result inferior to the said overcoat suitability 1, the evaluation is not performed.

(Test results)
In Examples 1 to 9 (particularly Examples 2 to 6), good results were obtained in the overcoat suitability 1 and 2.

Claims (2)

A coloring coating agent comprising an oxidation curable resin (A), a pigment (B), a metal dryer (C), and an aliphatic hydrocarbon-containing nonaqueous solvent (D),
As the pigment (B), a surface-treated rutile type titanium oxide (B-1) and a colored pigment (B-2) other than the (B-1),
A coloring coating agent, wherein the total oil absorption amount of the pigment (B) is 60 g or less when the solid content of the oxidation-curable resin (A) is 100 g. The colored coating agent according to claim 1, wherein the surface-treated rutile type titanium oxide (B-1) has an oil absorption of 30 g / 100 g or less.