JP4265473B2 - MULTILAYER COATING FORMATION METHOD AND COATED PRODUCT - Google Patents

Description

The present invention relates to a method for forming a multilayer coating film and an article coated by this method.
More specifically, the present invention relates to a coating film forming method capable of obtaining a metallic texture with a rough texture such as a casting (casting surface) and an article coated by this method.

  Currently, high design properties are required for painted articles such as automobiles, auto-bys, personal computers, and mobile phones. As a new design, there is a demand for a metallic texture with a rough texture such as a casting (casting surface).

  Conventionally, in order to develop such a design, a metallic paint containing a flake pigment having a glittering property is applied directly on a casting as an object to be coated. In such a method, the surface roughness of the casting surface of the base is used, so if the surface of the base is small or if the material is scratched and partially sanded, When a metallic paint containing a certain flake pigment is applied, there is a drawback that the whole object to be coated does not have a uniform rugged metallic tone due to the influence of the unevenness of the base.

  In addition, a method is also employed in which a coated object is cut and textured or textured, and then a metallic paint containing a brilliant flake pigment is applied. In such a system, since the surface roughness of the base is uniform, the entire object to be coated has a uniform metallic texture with a rugged texture. However, a great amount of labor is required for cutting and embossing on the base, and there is a disadvantage that the productivity is inferior. On the other hand, a coating composition containing spherical beads and brilliant flake pigments in order to obtain a metal-like coating film with a rugged texture such as casting without subjecting the workpiece to cutting or graining. The method of painting is also adopted. In such a system, by blending the spherical beads, the entire coated object can have a uniform rugged texture, but the orientation of the brilliant flake pigment is lowered and a metallic feeling is obtained. There was a drawback that it was not possible.

  In addition, in order to increase the brightness and jewel-like brightness of the catadioptric material, a conductive layer is formed on part of the glass or plastic bead of the catadioptric material, and then charged and sprayed onto the surface of the object to be coated. A painting method has been proposed. However, in this method, an aluminum vapor deposition facility is required to form a conductive layer on a part of the beads, and there is a disadvantage that productivity is inferior.

  In addition, a coating layer containing glass beads is applied on the metallic coating layer containing vapor-deposited metal foil in order to maintain the iridescent interference light and give the glittering and deep feeling of multi-directional reflection. Further, a method for forming a glitter coating film is proposed in which a top clear containing 1% or less of a scaly glitter pigment is applied. (Refer to Patent Document 2) This method is excellent in glittering radiance because the top clear with no hiding power is coated on the metallic coating layer containing the lower vapor-deposited metal foil and the glass bead layer. It is not a metal-like appearance with a rugged texture such as the desired casting.

Furthermore, an aggregate-containing coated metal plate for coating a top coat containing glass flakes that have passed through a 100-mesh sieve on a base coat containing spherical glass beads or glass fibers has been proposed. (Patent Document 3) In this method, when glass beads or glass fibers having a high specific gravity are blended in a coating composition, precipitation occurs during storage of the coating. In addition, the effects obtained are completely different.
Japanese Patent Laid-Open No. 5-50016 JP 2001-81407 A Japanese Patent Laid-Open No. 11-42735

  The present invention has been made by paying attention to such conventional problems, and it is possible to stably produce a metal-like coating film having a rugged texture like a casting without subjecting the workpiece to cutting or graining. It can be formed automatically.

That is, the present invention is coated on a coating object, the average particle diameter of 60 to 200 DEG [mu] m base coating composition obtained by blending 10 to 40 wt% of spherical resin beads with respect to the solid content of the film-forming resin of the (A) A top coat coating composition comprising 5 to 15 % by mass of a flake pigment having glitter on the solid content of the coating film-forming resin on a base coat film formed by wet-on-wetting ( A method for forming a multilayer coating film characterized by coating B) is provided.

Further, the present invention provides a base coat comprising 10 to 40 % by mass of spherical resin beads having an average particle diameter of 60 to 200 μm based on the solid content of the film-forming resin after a primer layer is applied to an object to be coated. On the base coat film formed by applying the coating composition (A), 5-15 % by mass of a flake pigment having a glittering property is blended by wet-on-wet with respect to the solid content of the film-forming resin. A method for forming a multilayer coating film is provided, which comprises coating the topcoat coating composition (B).

  Moreover, this invention provides the articles | goods coated by said coating-film formation method.

  By the method for forming a multilayer coating film of the present invention, it is possible to stably form a metal-like coating film having a rugged texture such as a casting without subjecting an object to be cut or textured.

  Hereinafter, the present invention will be described in detail.

  The base coat coating composition (A) used in the present invention contains spherical resin beads having an average particle diameter of 60 μm or more.

  As types of spherical beads, metal beads such as iron and copper, glass beads, resin beads and the like are generally known. However, in the case of metal beads such as iron and copper, when used as a base coat paint composition, metal ions are easily eluted, and there is a problem that the paint is colored or gelled by the eluted ions. Not. In the case of glass beads, since the specific gravity is large, if glass beads having an average particle diameter of 60 μm or more are blended in the base coat paint composition, there is a problem that precipitation occurs when the base coat paint is stored, which is not suitable. The spherical beads used in the present invention are preferably resin beads having a small specific gravity and being stable in the base coat paint. In particular, the preferred specific gravity range of the spherical beads is 1.0 to 1.5.

Examples of the resin beads used in the present invention include PMMA (polymethyl methacrylate) resin beads, MMA-EGDM (ethylene glycol dimethacrylate) copolymer resin beads, nylon resin beads, and polytetrafluoroethylene resin beads.

The resin beads used in the present invention are measured with a laser diffraction particle size analyzer and have an average particle size of 60 μm to 200 μm. The average particle diameter is preferably 80 μm to 130 μm. When the average particle size is smaller than 60 μm, the unevenness of the base coat coating composition (A) is small, and a metal-like coating film with a rough texture cannot be formed. On the other hand, if the average particle size is larger than 200 μm, there is a problem in that gun clogging occurs during air spray coating, which is not preferable.

  The above resin beads include “Toughtick Series (trade name)” manufactured by Toyobo Co., Ltd., “Tech Polymer Series (trade name)” manufactured by Sekisui Plastics Co., Ltd., and “Dinion Series (product) manufactured by Sumitomo 3M Limited”. Name) "and the like.

  The spherical resin beads blended in the base coat coating composition (A) of the present invention may be used alone. Two or more spherical resin beads may be used in combination.

  As the film-forming resin used in the base coat paint composition (A) of the present invention, a resin usually used for paint can be used without limitation. For example, an acrylic resin, a polyester resin, an alkyd resin, a fiber resin, a polyolefin resin, a chlorinated polyolefin resin, a fluororesin, a silicon resin, etc. may be used alone or in combination to form a non-crosslinked lacquer type. ) It can also be made into a cross-linking curable type in combination with a cross-linking resin such as a polyisocyanate compound or an epoxy compound.

  The form of the solid base coat paint used in the present invention is not limited to the solvent type, and water-soluble or water-dispersed water-based paints can be used.

When the base coat paint composition (A) in the present invention is a solvent-type paint, it is used after being dissolved in an organic solvent. As the organic solvent, aromatic hydrocarbon solvents, ester solvents, ketone solvents, alcohol solvents, ether solvents and the like can be used.
In the base coat coating composition (A) of the present invention, spherical resin beads having an average particle size of 60 to 200 μm are blended in an amount of 10% by mass to 40 % by mass with respect to the solid content of the film forming resin . When the blending amount is less than 10% by mass, the unevenness of the base coat coating composition (A) is small, and a rough metallic texture film cannot be formed. Moreover, when there are more compounding quantities than 40 mass%, since there is a problem that adhesiveness is inferior because there are few coating film forming resins, it is not preferable.

  The base coat coating composition (A) in the present invention may contain other color pigments and various additives as required. As the color pigment, those conventionally used for paints are used. For example, organic pigments include azo lake pigments, phthalocyanine pigments, indigo pigments, perinone pigments, perylene pigments, quinophthalone pigments, dioxazines. Pigments, quinacridone pigments, and the like, and examples of inorganic pigments include yellow lead, yellow iron oxide, and bengara. Additives include UV absorbers such as benzotriazole and oxalic acid anilide, antioxidants such as benzophenol, leveling agents such as silicone, viscosity control agents such as wax and organic bentonite, curing catalysts, etc. Can be mentioned.

The topcoat coating composition (B) of the present invention contains a flake pigment having glitter.
As the flake pigment having brilliant properties, any known flake pigment having brilliant properties that has been conventionally blended in paints can be used without limitation. Typical flake pigments having glittering properties include leafing type aluminum flakes, non-leafing type aluminum flakes, nickel flakes, copper flakes, titanium flakes, glass flakes, etc .; mica powders such as pearl mica and colored pearl mica; silica Polarizing pigments such as flakes and alumina flakes; glass flake pigments coated with metal or titanium dioxide; colored aluminum flake pigments, metal oxide-coated alumina flakes, metal oxide-coated silica flake pigments, plate-like iron oxide, etc. .
The top coat coating composition (B) of the present invention contains 5 % by mass to 15 % by mass of a flake pigment having a glittering property with respect to the solid content of the coating film-forming resin . 5 % by mass of flake pigment having brilliant properties with respect to the solid content of the film-forming resin
If it is less than 1, the glitter feeling is lowered. Moreover, when there are more compounding quantities than 15 mass%, since the problem that coating-film performance, such as moisture resistance, falls arises, it is unpreferable.

  The top coat coating composition (B) in the present invention can be blended with other color pigments and various additives as needed so as not to lose the glitter. As color pigments, those conventionally used for paints are used. For example, organic pigments include azo lake pigments, phthalocyanine pigments, indigo pigments, perinone pigments, perylene pigments, quinophthalone pigments, dioxazine pigments. Pigments, quinacridone pigments, and the like can be mentioned. Examples of inorganic materials include yellow lead, yellow iron oxide, and bengara. Additives include UV absorbers such as benzotriazole and oxalic acid anilide, antioxidants such as benzophenol, leveling agents such as silicone, viscosity control agents such as wax and organic bentonite, curing catalysts, etc. It is done.

  The topcoat coating composition (B) in the present invention is used after being dissolved in an organic solvent. As the organic solvent, aromatic hydrocarbon solvents, ester solvents, ketone solvents, alcohol solvents, ether solvents and the like can be used.

  The coating of the method for forming a multi-layer coating film used in the present invention can be performed by a conventionally known coating method such as an air spray method or an electrostatic method using an atomizing coater.

The objects to which the present invention is applied include metals including iron, aluminum, magnesium or alloys thereof, glass, inorganic materials such as concrete, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyamide, Examples thereof include resin molded products such as polyacryl, polyester, vinyl chloride resin, vinylidene chloride resin, polycarbonate, polyurethane, acrylonitrile-butadiene-styrene copolymer, plastic materials such as various FRPs, wood, and paper. In addition, it is arbitrary to perform an appropriate chemical conversion treatment on these coated substrates in advance, or to apply an undercoating such as a primer.
<Example>
Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples. However, the scope of the present invention is not limited to these examples. In addition, unless otherwise indicated in each example, a part represents a mass part.
<Preparation of base coat coating composition 1>
As an acrylic resin, 40 parts by weight of “Acridic A-190” (trade name, manufactured by Dainippon Ink & Chemicals, Inc., heating residue 50% by mass) and titanium oxide “JR603” (trade name, Takeca Co., Ltd.) 10 parts by mass) and 10 parts by mass of a mixed solvent having a ratio of xylene and isobutyl acetate of 50:50 are dispersed with an attritor using glass beads as a dispersion medium until the particle size becomes 10 μm or less, and titanium oxide paste is used. It was created. Next, 20 parts by weight of acrylic resin and 7.5 parts by weight of spherical beads “Toughtic AR650MZ” (trade name, manufactured by Toyobo Co., Ltd., average particle size 60 μm) are sequentially added and stirred. Furthermore, as a curing agent for the clear, 10 parts by mass of a polyisocyanate compound “Sumidur N-75” (trade name, manufactured by Bayer Polymer Co., Ltd., heated residue: 75% by mass), xylene, isobutyl acetate, A base coat coating composition 1 was prepared by adding 2.5 parts by mass of a mixed solvent having a ratio of 50:50 and stirring.
<Adjustment of base coat paint compositions 2-8>
Base coat paint compositions 2 to 8 were prepared in the same manner as the base coat paint composition 1 except that the ratio of the mixture was as shown in Table 1.

<Note>
1) Spherical resin beads: manufactured by Toyobo Co., Ltd., Tufic AR650MZ, polyMMA resin beads, average particle size 60 μm, 100% by mass
2) Spherical resin beads: manufactured by Toyobo Co., Ltd., Tufic AR650ML, polyMMA resin beads, average particle size of 80 μm, 100% by mass
3) Spherical resin beads: manufactured by Toyobo Co., Ltd., Tufic AR650MX, poly MMA resin beads, average particle size 40 μm, 100% by mass
4) Spherical resin beads: manufactured by Toyobo Co., Ltd., Tufic AR650M, poly MMA resin beads, average particle size 30 μm, 100% by mass
5) Titanium oxide: manufactured by Teika Co., Ltd., JR603,
6) Bright flake pigment: Toyo Aluminum Co., Ltd., aluminum paste TCR2020, aluminum flake, heating residue 75%,
7) Acrylic resin: manufactured by Dainippon Ink & Chemicals, Inc., Acrydic A-190, heating residue 50%,
8) Polyisocyanate compound: Bayer Polymer Co., Ltd., Smith N-75, heating residue 75%
9) Xylene / isobutyl acetate: mixed solvent, mass ratio 50/50
<Adjustment of Topcoat Paint Composition 1>
As an acrylic urethane resin-based clear paint, “High Urethane No. 5000 Clear” (trade name, manufactured by Nippon Oil & Fats BASF Co., Ltd., heated residue 45% by mass) 60 parts by mass, as a glitter flake pigment, “ 5 parts by mass of aluminum paste TCR2020 "(trade name, manufactured by Toyo Aluminum Co., Ltd., aluminum flakes) are sequentially added and stirred. Next, 15 parts by mass of a polyisocyanate compound “Sumidur N-75” (trade name, manufactured by Bayer Polymer Co., Ltd., heated residue: 75% by mass) is added as a clear curing agent, and xylene and isobutyl acetate are further added. 20 parts by mass of a mixed solvent having a ratio of 50:50 was added and stirred to prepare a topcoat coating composition 1.
<Adjustment of topcoat paint compositions 2 to 4>
Topcoat paint compositions 2 to 4 were prepared in the same manner as the topcoat paint composition 1 except that the ratio of the mixture was as shown in Table 2.

<Note>
6) Bright flake pigment: Toyo Aluminum Co., Ltd., aluminum paste TCR2020, aluminum flake, heating residue 75%,
10) Bright flake pigment: Merck & Co., Inc., Silical T60-WNT crystal silver, alumina flake, heating residue 100% by mass
11) Bright flake pigment: manufactured by Nippon Sheet Glass Co., Ltd., Microglass Metashine MC1020RS, glass flake, heating residue 100% by mass
12) Acrylic urethane resin-based paint: Nippon Oil & Fats BASF Coatings Co., Ltd., High Urethane No.5000 clear, heating residue 45% by mass


<Example 1>
An ABS base material made by Japan A & L Co., Ltd. having a thickness of 3 mm and 7 cm × 12 cm, “Clarastic MVF” was used as a test piece. This test piece was degreased using isopropyl alcohol to obtain a coating object. Ford Cup No. The base coat coating composition 1 having a viscosity adjusted with a mixed solvent of xylene and isobutyl acetate (mass ratio 50/50) so as to be 15 seconds at 4 (25 ° C.) is air sprayed to a dry film thickness of 20 μm. Painted with-. After leaving at room temperature for about 10 minutes, Ford Cup No. The diluted topcoat coating composition 1 having a viscosity adjusted with a mixed solvent of xylene and isobutyl acetate (mass ratio 50/50) so as to be 20 seconds at 4 (25 ° C.) is dried on a wet on wet basis. After coating with an air spray to a film thickness of 25 μm and leaving at room temperature for about 10 minutes, baking was performed at 75 ° C. for 30 minutes to obtain a test plate.
<Examples 2-4, Comparative Examples 1-5>
A test plate was obtained in the same manner as in Example 1 except that the base coat paint composition and the top coat paint composition were combined as shown in Table 3.
<Example 5>
After degreasing ABS base material “Clarastic MVF” made by Japan A & L Co., Ltd. with a thickness of 3 mm and 7 cm × 12 cm using isopropyl alcohol, “Primac No. 1500 Primer” (product) Name, Nippon Oil & Fats BASF Coatings Co., Ltd.) was applied with an air spray so that the dry film thickness was 8 μm, and allowed to stand at room temperature for about 10 minutes. Next, in the same manner as in Example 1, the base coat paint composition 1 and the top coat paint composition 1 were sequentially applied by wet-on-wet and baked at 75 ° C. for 30 minutes to obtain a test plate.

Using these test plates, the rough texture and metal feel were evaluated. The evaluation results are shown in Table 3.
(1) Rough texture A 10 person who can evaluate the finished appearance of the coating film was visually evaluated. The texture was judged according to the following evaluation criteria.
2: A rough texture 1; A rough texture 2 was accepted.
(2) Metallic sensation Visual evaluation was performed by 10 people who can evaluate the finished appearance of the coating film. The metal feeling was determined according to the following evaluation criteria.
2; 1 which has a metallic tone;

Claims (3)

The object to be coated, is formed by coating the average base coating composition obtained by blending 10 to 40 wt% based on the solids content of particle size 60 to 200 DEG [mu] m spherical resin beads a coating film forming resin (A) The top coat coating composition (B) formed by blending 5 to 15 % by mass of a flake pigment having brilliancy with respect to the solid content of the coating film-forming resin is applied on the wet base coat film. A method for forming a multilayer coating film. The object to be coated, after coating a primer layer, an average particle diameter of 60 to 200 DEG [mu] m spherical resin beads 10 40 mass% blended base coat paint composition comprising the solid content of the coating film forming resin (A) A top coat coating composition obtained by blending 5-15 % by mass of a flake pigment having brilliancy with a wet-on-wet coating on the solid content of the coating film-forming resin on a base coat film formed by coating A method for forming a multilayer coating film, which comprises coating an object (B).   An article coated by the coating film forming method according to claim 1.