JP2000273350A - Colored aluminum flake pigment, metallic coating material, and method for forming coating film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a colored aluminum flake pigment which is excellent in gloss and hiding power by specifying its average flake size, average flake thickness, and flake size distribution. SOLUTION: This colored aluminum flake pigment has an average flake size D50 of 5.0-9.0 μm and an average flake thickness of 0.4-1.0 μm, contains 4 wt.% or lower flakes having flake sizes of 2 μm or lower and 0.5 wt.% or lower flakes having flake sizes of 25 μm or higher, and preferably has a chroma represented by the formula of 15 or higher and a flip flop value of 0.25-0.75. The metallic coating material can be prepared by compounding 0.1-30 pts.wt. at least one colored aluminum flake pigment and optionally 0.05-20 pts.wt. other bright pigment, based on 100 pts.wt. solid content of the coating material. If necessary, a coloring pigment other than the above-mentioned is incorporated, preferably in an amount of 0.01-20 pts.wt. When a coating film is formed on a substrate, the metallic coating material is applied as a base coat and a clear coating material is then applied as a top coat, and the base coat and the top coat are simultaneously cured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metallic pigment giving a solid color tone having excellent appearance, vividness and hiding power, a paint using the same, and a method of coating the same.

[0002]

2. Description of the Related Art The conventional method of blending an aluminum flake pigment and a coloring pigment in a paint has excellent concealing properties and good coating appearance, but the color tone becomes turbid due to direct reflection from the aluminum flake pigment, and the color tone is vivid. I can't get it.
In addition, the color tended to be brilliant, and a calm and dense solid color tone could not be obtained. Further, in the method using only the coloring pigment, the concealing property is inferior, and the base coat layer needs to be thick. In recent years, a method using a colored aluminum pigment has also been disclosed and reported. However, as a conventional colored aluminum flake pigment for metallic paint, those having an average particle diameter of 13 to 70 μm and an average particle thickness of 2 μm or more are used in total. Was. Also,
The saturation is 5 to 30, and the flip-flop value (hereinafter referred to as “F
It may also be referred to as "F value" or "FF". ) Is 0.5 ~
About 1.5 were used. When such a colored aluminum pigment is used, the average particle size and the thickness are both large, so that aluminum flakes protrude more on the base coat coated surface, and the gloss does not increase even when the clear coat is applied, and a satisfactory appearance is obtained. Absent. In addition, since the average particle size was large, the particles of the colored aluminum flake pigment were conspicuous, and a dense solid color tone could not be obtained. Furthermore, since the thickness of the colored aluminum flake pigment is large and the concealing property is poor, the base material cannot be completely concealed unless the base coat layer is thickened.

[0003]

The problems to be solved by the present invention are as follows: (1) To provide a colored aluminum flake pigment which gives an excellent appearance of a glossy coating film and gives a dense solid color tone. To do. (2) To provide a paint having excellent concealing properties and giving a vivid solid metallic coating film. (3) To provide a paint which gives a glossy coating film having an excellent appearance. (4) An object of the present invention is to provide a method for forming a coating film using the paint.

[0004]

Means for Solving the Problems The present inventors have made intensive and creative efforts and completed the present invention. That is, the present invention provides: The average particle diameter _{D 50} 5.0~9.0μm, 0.4~1.0μm grain average thickness t, the content of particles smaller than 2μm is 4 wt% or less, the content of 25μm or more particles 0.
A colored aluminum flake pigment which is not more than 5% by weight. 2. saturation

[0005]

(Equation 2) Is 1 or more and the FF value is 0.25 to 0.75.
The colored aluminum flake pigment of the above. 3. A metallic paint containing 0.1 to 30 parts by weight of one or more of the colored aluminum flake pigments according to the above 1 or 2, based on 100 parts by weight of the solid content of the paint in the paint. 4. 0.1 to 30 parts by weight of one or more of the colored aluminum flake pigments according to claim 1 or 2 and 100 or more of the glitter solid pigment other than the colored aluminum flake pigment based on 100 parts by weight of the vehicle solid content in the paint. 05-20
Metallic paint containing parts by weight. 5. A metallic pigment further comprising a color pigment in the metallic paint according to claim 3 or 4. 6. A method for forming a coating film, comprising: after a base coat of the metallic paint described in 3 above on a surface of a substrate to be coated, top coating the clear paint, and simultaneously curing the base coat and the top coat. I will provide a. Hereinafter, the present invention will be described in more detail.

<Colored aluminum flake pigment> Average particle diameter D of the colored aluminum flake pigment of the present invention
₅₀ is 5.0 to 9.0 μm, and the average particle diameter D ₅₀
Is less than 5 μm, a vivid color tone cannot be obtained.
On the other hand, if it exceeds 9 μm, an excellent glossy appearance cannot be obtained, and a solid color tone cannot be obtained. The average particle thickness t of the flakes is suitably from 0.4 to 1.0 μm, and preferably from 0.5 to 0.8 μm. If the average particle thickness t is less than 0.4 μm, the surface area of the aluminum flakes becomes large, so that the adhesion density of the pigment is lowered and a sufficient vivid color tone cannot be obtained. On the other hand, 1 μm
When the thickness exceeds, aluminum flakes protrude more on the base coat-coated surface, and gloss is not increased even when a clear coat is applied, and a satisfactory appearance cannot be obtained. Further, the content of particles having a particle size of 2 μm or less needs to be 4% by weight or less of the whole. If the content exceeds 4% by weight, turbidity due to fine particles occurs, and a vivid color tone cannot be obtained. Further, the content of the particles having a particle diameter of 25 μm or more must be 0.5% by weight or less of the whole, and if it exceeds 0.5% by weight, the colored aluminum flakes protrude more on the base coat coated surface, and the clear Even if a coat is applied, the gloss does not increase and a satisfactory appearance cannot be obtained.

[0007] Saturation

[0008]

(Equation 3) Is suitably 15 or more, more preferably 20 to 50. When the saturation is less than 15, a vivid color tone cannot be obtained. The FF value is suitably from 0.25 to 0.75, and more preferably from 0.3 to 0.6. When the FF value is a small value of less than 0.25, a finish having a three-dimensional effect unique to the metallic coating film is not obtained. On the other hand, if the value is larger than 0.75, the image may become extremely dark depending on the viewing direction.
Solid vivid finish is not achieved.

[0009] The content of * Average particle diameter _{D 50} and 2μm or less of the particles <Method for Measuring Parameters>:
By laser diffraction particle size distribution measurement. The value of this embodiment is
It was measured by Shimadzu SALD-1100.

[0010] Content of particles of 25 μm or more: aperture 2
By sieve (screen) residue with a 5 μm screen.

* Average particle thickness t: The thickness of about 20 particles is directly measured from a particle cross-sectional photograph and averaged. If the thickness is not constant, several points are measured for each particle and the total average is calculated.

* Saturation

[0013]

(Equation 4) FF value: 5 parts by weight of a colored aluminum flake pigment in terms of solid content, and 50 parts by weight of mineral spirit,
Stir with a disper at 1000 rpm for 30 minutes. Next, the obtained dispersion (20 cc) is placed in a transparent glass container having a flat bottom (dimensions φ27 mm × 55 mm, bottom thickness 1 mm) and left for 24 hours. Subsequently, the color difference (L, a, b) and the FF value of the bottom surface of the glass container are measured using a colorimeter. In this example, the following measuring instruments were used. Color difference: SM color computer SM-5 manufactured by Suga Test Instruments Co., Ltd. FF value: Metallic feeling measurement device AL manufactured by Fuji Industrial Co., Ltd.
COPE LMR-200 <Method for producing colored aluminum flake> An example of a preferred method for producing the colored aluminum flake pigment of the present invention is shown below.

The base aluminum flake has an average particle size D50 of ₅ to 9 μm and an average particle thickness t of 0.15 to 0.15 μm.
Aluminum flakes having a content of particles of 0.3 μm and 2 μm or less of 4% by weight or less and a content of particles of 25 μm or more and 0.5% by weight or less are used. The particle shape is preferably a round coin shape having a smooth surface.

As a method for attaching a color pigment to the base aluminum flake, JP-A-1-315470, JP-A-9-40885, JP-A-9-124973, and JP-A-9-1997.
The method described in 316357 is used. For example, a method in which a coloring pigment is coated with a dispersant and then mixed with a base aluminum flake in a non-polar solvent by stirring to adhere to the base aluminum flake is preferable. As the dispersant, benzoic acid, vinyl benzoate, salicylic acid,
Anthranilic acid, m-aminobenzoic acid, p-aminobenzoic acid, 3-amino-4-methylbenzoic acid, 3,4-diaminobenzoic acid, p-aminosalicylic acid, 1-naphthoic acid, cinnamic acid, aminocinnamic acid Aromatic carboxylic acids such as;
Ethylenediamine, trimethylenediamine, tetramethylenediamine, pentamethylenediamine, hexamethylenediamine, 1,7-diaminoheptane, 1,8-diaminooctane, 1,10-diaminodecane, 1,12-
Diaminododecane, o-phenylenediamine, m-phenylenediamine, p-phenylenediamine, 1,8-diaminonaphthalene, 1,2-diaminocyclohexane,
Stearyl propylene diamine, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β
Amino compounds such as-(aminoethyl) -γ-aminopropylmethyldimethoxysilane; aluminum or titanium chelate compounds and the like are used.

The coloring pigment attached to the base aluminum flake is fixed by coating with a polymer polymerized by in-situ polymerization. Where in-si
Tu polymerization means that a polymerizable monomer is polymerized and polymerized in a step of producing a colored aluminum flake pigment, and specifically, a base aluminum flake having a colored pigment adhered thereto is dispersed in a solvent. A method in which a polymerizable monomer is added to the resulting slurry, a polymerization initiator is added while stirring and mixing, and the mixture is polymerized to precipitate a polymer on the surface of the base aluminum flake can be exemplified.

The polymer to be coated is synthesized, for example, from the following polymerizable monomers: acrylic acid, methacrylic acid, methyl methacrylate, butyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, stearyl acrylate, acrylic Cyclohexyl acid, 2-hydroxyethyl acrylate, 2-hydroxybutyl acrylate, 2-methoxyethyl acrylate, acrylic acid 2
-Diethylaminoethyl, butyl methacrylate, octyl methacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,9
-Nonanediol diacrylate, neopentyl glycol diacrylate, tripropylene glycol diacrylate, tetraethylene glycol diacrylate,
Trimethylolpropane triacrylate, tetramethylol methane tetraacrylate, pentaerythritol triacrylate, trisacryloxyethyl phosphate, ditrimethylolpropane tetraacrylate, styrene, α-methylstyrene, vinyl toluene,
Divinylbenzene, acrylonitrile, methacrylonitrile, vinyl acetate, vinyl propionate, maleic acid,
Crotonic acid, itaconic acid, polybutadiene, linseed oil,
Soybean oil, epoxidized soybean oil, epoxidized polybutadiene, cyclohexene vinyl monoxide, divinylbenzene monooxide.

The amount of the coloring pigment to be attached is 50 to 300 parts by weight (preferably 50 to 200 parts by weight) based on 100 parts by weight of the base aluminum flake, and the resin component to be attached is 100 parts by weight of the base aluminum flake. , 10 to 50 parts by weight (preferably 10 to 40 parts by weight)
The total of the colored pigment layer and the resin layer is adjusted to 0.3 to 0.8 μm (preferably 0.4 to 0.7 μm) in the entire colored aluminum flake pigment.

The thickness ta of the base aluminum flake, the thickness of the (colored pigment layer + resin layer): tb, the added amount of the colored pigment Wp by weight (based on 100 parts by weight of aluminum), the specific gravity of the colored pigment: ρp, the resin coating amount: Wr Tb = ta · (100 / 2.7 + Wp / ρp + Wr / r) / (100 / 2.7) -ta, where tb is calculated and adjusted as resin specific gravity ρr (based on 100 parts by weight of aluminum). Here, the weight ratio of the color pigment / resin coating amount is 3 to 10 (preferably 4 to 6).
And

The coloring pigments include phthalocyanine blue, phthalocyanine green, diketopyrrolopyrrole,
Quinacridone red, isoindolinone yellow, copper azomethine complex, perylene maroon, dioxazine violet, iron oxide, indanthrene blue and the like are preferred.

<Metallic paint> The essential components of the metallic paint of the present invention comprise the above-mentioned colored aluminum flake pigment and a vehicle described below, and are usually provided in a form dispersed and dissolved in a solvent. The content of the colored aluminum flake pigment is preferably from 0.1 to 30 parts by weight based on 100 parts by weight of the solid content of the coating composition.
If the saturation is inferior, and if it exceeds 30 parts by weight, the colored aluminum flakes protrude more on the base coat coated surface, and the gloss does not increase even if a clear coat is applied, and a satisfactory appearance cannot be obtained. The colored aluminum flake pigment is not limited to one type, and two or more types may be used in combination. The luster pigment other than the above-mentioned colored aluminum flake pigment may be further added in an amount of 0.05 to 20 parts by weight based on 100 parts by weight of the solid content of the vehicle. Further, if necessary, additives such as extender pigments, anti-settling agents, curing catalysts, ultraviolet absorbers, antioxidants, leveling materials, surface modifiers such as silicone and organic polymers, anti-sagging agents, thickeners , Defoamer, lubricant, crosslinkable polymer particles (microgel)
Etc. can be appropriately added. As the anti-settling agent, a polyamide wax which is a lubricating dispersion of an aliphatic amide and a polyethylene wax which is a colloidal dispersion mainly composed of polyethylene oxide are preferable.

<Vehicle> Examples of the coating film forming resin constituting the vehicle include an acrylic resin, a polyester resin, an alkyd resin, a fluororesin and the like, and an acrylic resin and a polyester resin are particularly preferably used. Usually, it is used after being mixed with a crosslinking agent such as an amino resin or a blocked polyisocyanate compound. Further, these resins are not limited to one kind, and may be used in combination of two or more kinds. In addition, a thermoplastic resin such as a thermoplastic acrylic resin, a two-component urethane resin, and a silicone resin that can be cured by drying at room temperature can also be used. As the blending ratio of the coating film forming resin and the crosslinking agent, the coating film forming resin is 90 to 50% by weight, preferably 85 to 60% by weight in terms of solid content, and the crosslinking agent is 10 to 50% by weight, preferably Is 15-40
% By weight. If the crosslinking agent is less than 10% by weight (the resin for forming a coating film exceeds 90% by weight), the crosslinking in the coating film is not sufficient. On the other hand, when the cross-linking agent exceeds 50% by weight (the resin for forming a coating film is less than 50% by weight), the storage stability of the metallic paint is lowered and the curing speed is increased, so that the appearance of the coated film is deteriorated.

<Glitter pigments other than the above-mentioned colored aluminum flakes> As the other glitter pigments that can be added to the metallic paint other than the above-mentioned aluminum flakes of the present invention, those conventionally used for paints are conventionally used. For example, aluminum flake pigments (leafing type, non-leafing type), mica pigments (including mica subjected to surface treatment such as titanium dioxide coated mica, metal plated mica, other colored mica, etc.), graphite pigment, alumina flake, metal Titanium flakes,
Metal flakes such as stainless flakes and zinc flakes,
Examples include plate-like iron oxide, phthalocyanine flakes, and metal-plated glass flakes.
The seed or two or more kinds can be arbitrarily set and used in consideration of the design property, in an addition amount within a range that does not hinder the effect of the colored aluminum flake pigment. Usually preferably 1 paint solids
The amount can be set in the range of 0.05 to 20 parts by weight for 00 parts by weight.

<Coloring Pigment> As the other coloring pigments which can be added to the metallic coating of the present invention, those conventionally used for coatings are used. For example, azo lake pigments, phthalocyanine colorings are used as organic pigments. Pigments, indico-based pigments, berylen-based pigments, quinophthalone-based pigments, dioxazine-based pigments, quinacridone-based pigments, isoindolinone-based pigments, metal complex pigments, and the like, and inorganic pigments, for example, graphite, yellow iron oxide, Bengala, titanium dioxide, carbon black, titanium dioxide, and the like. One or more selected from these may be arbitrarily set in consideration of the design properties in an amount not to impair the effect of the colored aluminum flake pigment. Can be used. Usually preferably for 100 parts by weight of paint solids,
It can be set within the range of 0.01 to 20 parts by weight. When a coloring pigment is added, a coloring pigment which is the same as or the same as the coloring pigment used for coloring the colored aluminum flake pigment (ΔE: within 10) is preferred.

<Solvent> The metallic coating material of the present invention is usually provided in a form in which the essential components are dispersed and dissolved in a solvent. The solvent may be any solvent that dissolves and disperses the vehicle, and may be used in the form of an organic solvent, a non-aqueous dispersion, an aqueous solution or an aqueous dispersion. In the case of an aqueous system, an appropriate amount of a hydrophilic organic solvent may be contained. In addition, as the organic solvent, hydrocarbons such as toluene and xylene, acetone, ketones such as methyl ether ketone, ethyl acetate,
Examples thereof include esters such as cellosolve acetate and butyl cellosolve, alcohols and the like, and of course, a mixed solvent of two or more selected from these.

<Additives> extender, anti-settling agent, curing catalyst, ultraviolet absorber, antioxidant, leveling agent, surface conditioner such as silicone and organic polymer, anti-sagging agent, thickener, antifoaming agent , A lubricant, a crosslinkable polymer particle (microgel), and the like are usually added in an amount of 5
By blending in a proportion of not more than parts by weight, the performance of the metallic paint or coating film can be improved.

The method for forming a coating film according to the present invention is a method for forming a coating film comprising forming a base coating film using the metallic coating material of the present invention and then forming a top coating film using a clear coating material. (B) A coating system containing a colored aluminum flake pigment is provided.

Coated object (substrate) Metallic materials such as iron, aluminum, copper or alloys thereof; glass; Inorganic materials such as cement, concrete, etc .; resins such as polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer resin, polyamide resin, acrylic resin, vinylidene chloride resin, polycarbonate resin, polyurethane resin, epoxy resin and various FRP And natural or synthetic materials such as wood and fiber materials (paper, cloth, etc.).

The coating material is applied to the substrate to be coated directly or via an undercoating film. In the case of coating the body and parts of an automobile, it is preferable to apply a chemical conversion treatment, an electrodeposition coating, an intermediate coating or the like in advance.

Method for Forming Coating Film A metallic coating is applied on a substrate to form a metallic coating of a base coat, and at least one clear coating is applied as a top coat on the obtained metallic coating. It is suitably used for automobile bodies and parts.

<Basecoat / Metallic coating> When using a substrate coated with an undercoat with an intermediate coating or the like, wet-on-wet (W / W) is applied on the undercoat.
A metallic paint is applied by a method or a bake-on-wet (B / W) method. The W / W method is a method in which an undercoat film is formed and then dried by air drying or the like, and is applied in an uncured state or a semi-cured state. The B / W method is a method in which the undercoat film is applied after baking. It is. The coating method is not particularly limited, but a spray method, a roll coater method and the like are preferable. The dry thickness of the metallic coating is preferably 5 to 50 μm,
-30 μm is more preferable.

<Topcoat Clear> At least one clear topcoat film is formed on the basecoat film. When two or more layers of the clear paint are applied when the base coat paint contains a large amount of metallic pigment, the glitter of the surface is improved. The clear coating may be any of those commonly used for topcoats. The application of the clear paint on the coating film of the present invention can be performed by a wet-on-wet (W / W) method. When the clear paint is applied a plurality of times, it may be baked after the final clear coat is applied, and may be in a W / W, plate or semi-cured state at the stage of forming the lower clear coat. Later baking temperature is 1
The temperature may be from 20 to 160 ° C. Dry film pressure of clear coating film is 10
-80 μm is preferable, and 20-50 μm is more preferable.

The composition of the clear coating composition is as follows: (i) a mixture of at least one thermosetting resin selected from an acrylic resin, a polyester resin, a fluororesin and a modified resin thereof and the above-mentioned crosslinking agent, or (Ii) Although a vehicle comprising a carboxyl group-containing polymer and an epoxy group-containing polymer can be used, (ii) a carboxyl group-containing polymer and a A composition containing a vehicle comprising an epoxy group-containing polymer (see Japanese Patent Publication No. H8-19315) is preferable. Further, as a preferred composition, as long as the transparency of the transparent resin is not impaired, a pigment, a modifier, an ultraviolet absorber, a leveling agent,
Additives such as dispersants and defoamers can be blended.

[0034]

EXAMPLES Example 1 Commercially available diketopyrrolopyrrole pigment (IRGAZ manufactured by Ciba Specialty Chemicals Co., Ltd.)
(IN DPP RUBINE TR) 50g N-β-
4 g of (aminoethyl) -γ-aminopropylmethyldimethoxysilane (10 parts by weight based on 100 parts by weight of pigment),
200 g of mineral spirit was added, and 800 g of glass beads having a diameter of 1 mm were inserted.
The mixture was dispersed in a ball mill for 24 hours using a cc pot mill. Then, an aluminum paste (manufactured by Toyo Aluminum Co., Ltd., solid content: 65%, average particle size: 7 μm) was added to the pot mill.
m, average particle thickness: 0.2 μm, particle content of 2 μm or less: 3.5%, particle content of 25 μm or more: 0.1%)
76.9 g (50 g as a metal component) and 100 g of mineral spirit were added, and the mixture was further dispersed for 1 hour.
The obtained slurry was washed with 2 liters of mineral spirit to separate it from glass beads, and solid-liquid separated by filtration to obtain a paste-like colored aluminum flake pigment having a solid content of 60%. This is called primary colored aluminum flake pigment.

The above primary colored aluminum flake pigment 2
0.5 g of methyl methacrylate in a slurry containing 0 g,
0.5 g of 1,6 hexanediol diacrylate, 0.5 g of styrene, and 0.5 g of acrylic acid (total of monomers: 20 parts by weight per 100 parts by weight of aluminum) are added, and heated at 80 ° C. in nitrogen with stirring. Then, 0.05 g of azobisisobutyronitrile was added as a polymerization initiator and reacted for 12 hours to polymerize the monomer and precipitate on the surface of the colored aluminum flake pigment. After the treatment, the slurry was subjected to solid-liquid separation to obtain a paste having a solid content of 50%.

The chroma (C) and FF value of the obtained colored aluminum flake pigment were measured by the methods described above, and as a result, C = 23.7 and FF = 0.36.

(Examples 2 to 6, Comparative Examples 1 to 5) Same as Example 1 except that the base aluminum flake and the coloring pigment used were changed as shown in Table 1.

[0038]

[Table 1] (Examples 7 to 23, Comparative Examples 6 to 20) Preparation of substrate to be coated Dull steel plate (length 300 mm, width 100 mm and thickness 0.
8 mm) with a zinc phosphate treating agent (“Surdyne SD200”).
No. 0 "(Nippon Paint Co., Ltd.) and a cationic electrodeposition coating (" Power Top U-50 ", Nippon Paint Co., Ltd.) so as to have a dry film thickness of 25 [mu] m. I painted. Then, after baking at 160 ° C. for 30 minutes, the intermediate coating (“Olga S-90 Sealer Gray (N
-6) ", manufactured by Nippon Paint Co., Ltd.)
m at 30 ° C at 140 ° C
Baking for minutes, an intermediate coating film was formed. 2. Preparation of Metallic Paint Composition Acrylic resin (styrene / methyl methacrylate / ethyl methacrylate / hydroxyethyl methacrylate /
Methacrylic acid copolymer, number average molecular weight about 20,000
0, hydroxyl value 45, acid value 15, solid content 50% by weight);
The pigment is shown in Table 2 with respect to the vehicle obtained by blending a melamine resin (trade name, “Uban 20SE”, manufactured by Mitsui Chemicals, Inc., solid content 60% by weight) at a solid content weight ratio of 80:20. It was blended in proportions. Then, an organic solvent (toluene / xylene / ethyl acetate / butyl acetate weight ratio = 70/15)
/ 5), and the mixture was stirred and mixed with a dissolver so as to have an appropriate coating viscosity to prepare a metallic coating composition. 3. Formation of Metallic Coating Film The above-mentioned metallic coating composition was applied on the surface to be coated of the substrate so that the dry film thickness became 15 μm. Coating is electrostatic coating machine ("Auto REA", ABB Industry Co., Ltd.)
And a spray pressure of 2.8 kg / cm ² . The atmosphere in the booth during coating was maintained at a temperature of 25 ° C. and a humidity of 75%. After the coating, the coating was set for 3 minutes, the clear coating was applied to a dry film pressure of 35 μm, the coating was set at room temperature for 10 minutes, and baked at a temperature of 140 ° C. for 30 minutes.
The obtained coating film was evaluated for chroma, coated surface gloss (gloss), hiding power, dense feeling, and polychromaticity by the following evaluation methods. Table 2 shows the results. The clear paint used was (A) an acrylic / melamine resin clear paint (trade name: “Super Luck 0-
130 Clear ", manufactured by Nippon Paint Co., Ltd.)
(B) Clear paint ("Macflow 0-520 Clear", manufactured by Nippon Paint Co., Ltd.) comprising a blend of a carboxyl group-containing polymer and an epoxy group-containing polymer
Kind.

[0039]

[Table 2] Evaluation method Concealing power: After coating and baking the black-and-white concealing paper at different film pressures, evaluation was made at a dry film pressure (μm) at which a black-and-white boundary could not be visually judged.

Dense feeling: The degree of clogging of the glittering material particles (density) was visually evaluated when the test plate was viewed almost from the front. 5: The density was extremely strong. 4: The density was strong. There is 2 ... The feeling of denseness is weak 1 ... The feeling of denseness is very weak Painted gloss (gloss) ... The glossiness (gloss) visually observed when the test plate is viewed from almost the front is evaluated 5 ... Surface gloss is extremely 4 ... High surface gloss 3 ... High surface gloss 2 ... Low surface gloss 1 ... Very low surface gloss Saturation ... Saturation by visual observation when the test plate is viewed from almost right above (good: 5 ... Saturated 4 ... Slightly colorful 3 ... Normal 2 ... Slightly turbid 1 ... Slightly turbid Polychromatic ... The test piece after paint formation was almost true (A) when viewed from above, and (B) when viewed at an angle of about 15 degrees with respect to the test piece. The colors exhibited by the coating film were visually evaluated. 3 ... The colors presented in (A) and (B) were clearly different 2 ... The colors presented in (A) and (B) were different 1 ... The colors presented in (A) and (B) cannot be said to be different.

[0041]

The present invention can provide a metallic paint which gives a solid metallic coating film having excellent chroma, hiding properties and appearance.

* By further blending a coloring pigment,
Provides a solid metallic coating film with excellent hiding properties.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // B22F 1/00 B22F 1/00 N (72) Inventor Yoshikatsu Saito 4-1-1 Minamishinagawa, Shinagawa-ku, Tokyo No. 15 Nippon Paint Co., Ltd. Tokyo Office (72) Inventor Kenshi Maruo 4-1-1, Minamishinagawa, Shinagawa-ku, Tokyo F-term (Reference) 4D075 AA01 AA09 AA82 AC23 BB25Y BB75X CB13 DA23 DB02 DC12 DC13 EA43 EB22 EB35 EC10 EC11 4J037 AA05 CB09 CB16 CB23 CB28 DD05 DD10 DD24 EE03 FF09 4J038 EA011 HA066 KA08 KA15 KA20 MA14 NA01 4K018 BA08 BB04 BD04

Claims (6)

[Claims] 1. A mean particle diameter _{D 50} 5.0~9.0μ
m, a colored aluminum flake pigment having an average particle thickness t of 0.4 to 1.0 μm, a content of particles of 2 μm or less of 4% by weight or less, and a content of particles of 25 μm or more of 0.5% by weight or less. 2. Saturation (1) Is 15 or more, and the flip-flop value is 0.25 to 0.75.
The colored aluminum flake pigment according to claim 1, wherein 3. A metallic paint containing 0.1 to 30 parts by weight of one or more of the colored aluminum flake pigments according to claim 1 or 2 based on 100 parts by weight of the solid content of the paint in the paint. 4. 0.1 to 30 parts by weight of one or more of the colored aluminum flake pigments according to claim 1 or 2 and 100 parts by weight of the solid content of the vehicle in the coating material and other than the colored aluminum flake pigment. Bright pigment 0.
Metallic paint containing 0.5 to 20 parts by weight. 5. A metallic paint according to claim 3, further comprising a coloring pigment. 6. A coating film comprising a base coating of the metallic coating according to claim 3 on a surface of a substrate to be coated, a top coating of a clear coating, and a simultaneous curing of the base coating and the top coating. Forming method.