JPH03262572A - Multicolor coating finish method - Google Patents

Abstract

PURPOSE:To efficiently form a multicolor finish film excellent in finish properties by forming a strippable film to the surface of a substrate colored film and subsequently applying finish color coating thereto before releasing the strippable film. CONSTITUTION:Color coating is applied to a part or the whole of the surface of a coated or uncoated material and dried to form a substrate color film. When the substrate color film was applied to the entire surface of the material, strippable coating is applied to a part of the substrate color film and, when the substrate color film was formed to a part of the surface of the material, the strippable coating is applied to a part or the whole of the substrate color film to form a strippable film. Continuously, finish color coating is applied to the surface of the material and/or the surface of the substrate color film to form a film before the strippable film is released. As a result, productivity is enhanced as compared with a conventional method and a multicolor finished film excellent in finish properties can be formed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a multicolor paint finishing method.

[Prior Art] In recent years, in the fields of automobiles, home appliances, industrial machinery, etc., the demand for multi-colored finishes has increased from single-color finishes due to diversification of user needs. Multicolor finishing is achieved by masking a portion of the surface of the colored coating film, then applying a colored paint for multicolor finishing, and then peeling off the masking. Conventional masking methods for multi-colored finishes are usually carried out by an operator placing a piece of paper on the surface of the paint film where he or she wants to mask and attaching tape around the area. However, this method has problems in that productivity is low and product cost is high.

[Means for Solving the Problems] As a result of extensive research in order to solve the above-mentioned problems, the present inventors formed a strippable coating film on the surface of the base colored coating film, and then removed these coatings. The inventors have discovered that a method in which a finishing colored paint is applied to the film surface and then the strippable paint film is peeled off solves all of the above-mentioned problems, and the present invention has been completed.

That is, the present invention applies a colored paint to part or all of the surface of a painted or unpainted material and dries to form a base colored coating film, and in the case where the base colored coating film is formed on the entire surface of the material, the base colored paint is applied. A strippable paint is applied to a part of the film, or if a colored base coat is formed on a part of the surface of the material, a strippable paint is applied to a part or all of the base colored coat to form a strippable paint film. The present invention also relates to a multi-color painting finishing method, which comprises subsequently applying a finishing colored paint to the surface of the material and/or the underlying colored paint film to form a paint film, and then peeling off the strippable paint film.

Materials used in the present invention include metals, plastics,
For materials such as inorganic materials, it is desirable to coat these materials with one or more paints selected from conventionally known primers, intermediate coats, base coats, etc., and dry as necessary. The colored coating film is preferably a coating film formed from a coating material which is already known per se and whose main components are a crosslinked curable resin composition and a colorant. Specifically, as a crosslinked curable resin composition, for example, A thermosetting resin composition consisting of a base resin such as acrylic resin, polyester resin, alkyd resin, epoxy resin, polyether resin, and urethane resin, and a crosslinking agent (amine resin, blocked polyisocyanate compound, etc.) A curing agent such as a polyisocyanate compound is added to the product or the base resin at room temperature or low temperature (approximately 100°C).
(below) There are resin compositions that crosslink when heated, and examples of colorants include aluminum powder, copper powder, mica powder, mica-like powder coated with titanium oxide, MIO
Metallic pigments such as (micaceous iron oxide), titanium oxide,
Examples include inorganic pigments such as carbon black, and organic pigments such as azo and phthalocyanine pigments. Further, the paint may contain extender pigments, various additives, organic solvents, etc., as necessary.

The base colored coating film can be formed by applying the above-mentioned paint by means such as spray coating, flow coating, dipping coating, spacing coating, roller coating, etc., and heating if necessary.

The coating film preferably has a dry film thickness of about 10 to 100 P.

The strippable paint used in the present invention includes, for example, acrylic polymer emulsion, vinyl acetate polymer emulsion, vinyl chloride-vinyl acetate polymer emulsion, ethylene-vinyl acetate polymer emulsion,
A polyvinyl chloride sol prepared by dispersing an aqueous emulsion such as a vinyl chloride polymer emulsion, a styrene-butadiene polymer emulsion, a urethane polymer emulsion, a diene polymer emulsion, and a polyvinyl chloride powder in a plasticizer and, if necessary, an organic solvent. Preferably, it is made of

The strippable paint may contain fillers, IF colorants, additives, etc., if necessary. A strippable coating film is formed by applying the above strippable coatings in series by spray coating, flow coating, dipping coating, roller coating, spatula coating, etc., and drying at room temperature or heating as necessary. can. The strippable coating film has a dry film thickness of usually 30 to 500 p, preferably 50 to 11 p.
It can be applied to about 00II. Also.

The adhesion force between the strippable paint film and the base colored paint film is 0.0
It is desirable that it is within the range of 1 to 5 kg/cm.

As the finishing colored paint used in the present invention, a paint similar to the above-mentioned paint containing a crosslinked curable resin composition and a colorant as main components can be used. Further, this paint can be applied to a dry film thickness of about 10 to 100 P using the same coating method as the base colored paint.

In the present invention, the strippable coating can be peeled off from the base colored coating before or after drying of the finishing colored coating. Further, for those peeled off before drying, drying is performed after peeling.

[Example] The present invention will be described in more detail with reference to Examples below.

I Preparation of sample (1) Steel plate: Palbond #3050 (manufactured by Nippon Barker Risin ■,
Steel plate (300 mm in length, 90 mm in width, 0.8 mm in thickness) chemically treated with a zinc phosphate metal surface treatment agent.

(2) Electric IF paint: Cation Electric Manufacturing! Paint: A cationic electrodeposition paint with a solid content of 20% by weight and a pH of 6.5, made by using a polyamide-modified epoxy resin/blocked isocyanate compound as a vehicle component and neutralized with acetic acid.

(3) Intermediate paint: Short oil-based alkyd resin paint Soybean oil modified alkyd resin mainly using phthalic anhydride and terephthalic acid as polybasic acid components (oil length: 15%, hydroxyl value = 80, acid value: 15) An intermediate coating composition comprising 100 parts by weight of a pigment (titanium white) per 100 parts by weight of a vehicle component consisting of 75% by weight of ) and 25% by weight (solid content) of a butyl etherified methyl melamine resin.

(4) Top coating: (A) Oil-free alkyd resin-based white paint Oil-free alkyd resin mainly using phthalic anhydride and trimellitic anhydride as polybasic acid components (hydroxyl value: 80, acid value:
10) An organic solvent-based coloring paint comprising 100 parts by weight of titanium white per 100 parts by weight of a vehicle component consisting of 70% by weight and 30% by weight of butyl etherified methyl melamine resin.

(B) Oil-free alkyd resin black paint (A) above
A black paint was obtained using the same resin composition as the paint (A) except that 100 parts by weight of titanium white was replaced with 5 parts by weight of carbon black.

(C) Acrylic-melamine resin blue metallic base paint Copolymer consisting of methyl methacrylate, ethyl methacrylate, n-butyl methacrylate and hydroxyethyl methacrylate (number average molecular weight: approx. 30,000
An organic solution type blue metallic base paint prepared by blending and dispersing 10 parts by weight of aluminum powder and 3 parts by weight of phthalocyanine pull into 100 parts by weight of a vehicle component consisting of 75% by weight of hydroxyl value: 100) and 25% by weight of butylated melamine resin. .

(D) Acrylic-melamine resin based metallic base paint The above-mentioned blue metallic base paint does not contain phthalocyanine pull.

(E) Acrylic resin clear paint Copolymer consisting of ethyl methacrylate, inbutyl methacrylate, styrene and hydroxyethyl acrylate (number average molecular weight: approximately 15.000, hydroxyl value: 1
00) An organic solution type clear paint whose main components are 70% by weight and 30% by weight of butylated melamine resin.

(5) Strippable paint (a) Acrylic emulsion paint 1 Monomer components of 30.0 parts by weight of acrylonitrile, 69.9 parts by weight of butyl acrylate, and 0.1 part by weight of acrylic acid were added in an aqueous solution of partially saponified polyvinyl alcohol. An emulsion paint with a solid content of 47% by weight, which is produced by an emulsion reaction using potassium persulfate.

(b) Acrylic emulsion paint 2 Monomer components of 30.0 parts by weight of acrylonitrile, 10.0 parts by weight of 2-ethylhexyl acrylate, and 2.1 parts by weight of acrylic acid are added in an aqueous solution of sodium alkylbenzenesulfonate using potassium persulfate. An emulsion paint with a solid content of 48% by weight that was subjected to an emulsion polymerization reaction.

(C) Polyvinyl chloride-based organosol paint strip Zolcon 5G2000 (trade name, manufactured by Kansai Paint Co., Ltd.).

Example 1 A cationic electrodeposited paint was applied to the treated steel sheet at a bath temperature of 28° C. and a load of 250 V for 180 seconds to burn it to a film thickness of 2OF+. After washing with water, it was baked at 170"C for 20 minutes.

Next, an intermediate coating paint was applied to the film to a thickness of 25 to 30F using air spray, and baked at 140°C for 20 minutes.

(Intermediate paint is thinner) Eau de cup dynamic, 4 in 23
Adjust the viscosity in seconds. ) Next, the white paint (A) was air-sprayed to a thickness of 3 OP on the entire surface of the intermediate coated plate, and baked at 140° C. for 20 minutes to obtain a white base plate. 1/2 area (length 30
0x width 45a+m) with strippable paint (a) using air spray to a film thickness of 80F at 50℃ for 10 minutes! 2, and then a black paint (B) was air sprayed onto the surface of the white plate to a thickness of 30p4, and dried at 140°C for 20 minutes. After the obtained coated board was cooled to room temperature, the strippable coating film was peeled off from the white board. The peelability of the strippable coating was good, and the white plate after peeling had a high gloss coating similar to the coating surface before being coated with the strippable coating.

Example 2 A blue metallic base paint (C) was applied to the entire surface of the intermediate coated plate obtained in Example 1 with a film thickness of 30P* by air spray.
It was dried at 40°C for 20 minutes. Spray strippable paint (b) on 1/2 area of the painted plate with a film thickness of BOP* using air spray and dry at 50℃ for 10 minutes, then apply metallic base paint (D) by air spraying onto the surface of the blue metallic base paint. After painting with a film thickness of 3 opw and peeling off the strippable paint film from the blue metallic base paint film,
Air spray clear paint (E) onto the surface of the blue metallic base and metallic base coating to a film thickness of 30 tt.
W coating and drying at 140°C for 20 minutes. The peelability of the strippable coating was good, and the surface of the blue metallic base coating after peeling the strippable coating had the same blue metallic base coating surface as before peeling.

Example 3 Strippable paint (C) was applied to 1/2 area of the base white board obtained in Example 1 with a film thickness of 100P using a roller and heated at 200°C.
- After drying for 10 minutes, the black paint (B) was applied and dried in the same manner as in Example 1, and the strippable coating was peeled off. The peelability of the strippable coating was good, and the white plate after peeling had a high gloss coating similar to the coating surface before being coated with the strippable coating.

[Effects of the Invention] As described above, by forming a strippable paint film on the surface of the base colored paint film, then applying a finishing color paint, and then peeling off the strippable paint film, compared to the conventional method, In addition, it is possible to improve productivity and form a multicolor finish coating film with excellent finishing properties.

Claims (1)

[Claims] 1. Colored paint is applied to part or all of the surface of a painted or unpainted material and dried to form a colored base coating, and for those that have a colored base coat formed on the entire surface of the material, a portion of the colored base coating. Apply a strippable paint to the surface of the material, or apply a strippable paint to a part or all of the base colored paint film to form a strippable paint film on a part of the surface of the material, and then A multicolor painting finishing method characterized by applying a finishing colored paint to the surface of a material and/or a base colored paint film to form a paint film, and then peeling off a strippable paint film.