JP2000051784A - Production of smoke chromium plating/coating film combined decorative body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of producing a durable combined decorative body by combining a smoke chromium plating part and a coating film part formed on a substrate made of a synthetic resin. SOLUTION: A masking is applied to the smoke chromium plating part of a substrate 5. To the coating film part, to which this masking is not applied, a paint having resistance to a plating treatment containing roughening the substrate 5 is applied to form a resist coating film 11. To the smoke chromium plating part, trivalent chromium plating 10 is applied after it is roughened by an etching agent to form a conductive thin film. To this trivalent chromium plating part, masking is applied leaving a clearance from a parting part from the resist coating film 11 to the inside. To a clearance and the resist coating film 11 to which the masking is not applied, paint of desired color having adhesive power to the trivalent chromium plating 10 is applied to form a finish coating film 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a smoked chrome plating / coating combination decorative body formed by combining a smoked chrome plating portion and a coating portion formed on a synthetic resin base material.
For example, the present invention relates to a method for manufacturing a radiator grill, a mark, and the like.

[0002]

2. Description of the Related Art For example, a smoked chrome plated portion 1 and a coating portion 2 formed on a synthetic resin base material as shown in FIG.
In the case of manufacturing the emblem 9 in combination with the above, as shown in FIG. 2, the base material 5 is subjected to a pretreatment, and thereafter, a silver-white hexavalent chromium plating 6 is applied, and a coating film 7 is formed on the surface by a color paint. A clear coating film 8 made of a smoke clear paint is formed on the remaining portion.

[0003]

This method is based on the premise that inexpensive hexavalent chromium is used, and the smoke clear coating film to be overcoated has poor durability due to the transmission of ultraviolet rays, and peels off. There's a problem. Further, since the hexavalent chromium plated surface is inactive, there is a problem that the selection range of the coating material is limited in terms of the adhesion of the coating film.

[0004] In view of the above, the present invention provides a durable smoke chrome plating / coating combination decorative body formed by combining a smoke chrome plating portion and a coating portion formed on a synthetic resin base material. It is an object of the present invention to provide a method of manufacturing.

[0005]

According to the present invention, there is provided, in accordance with the present invention, a smoke chromium formed by combining a smoke chromium plating portion and a coating film portion formed on a synthetic resin base material. In the manufacturing method of the plating / coating combination decorative body, masking is applied to the smoked chrome-plated portion of the base material, and the coating portion that is not masked is subjected to a plating process including surface roughening of the base material. A resist coating is formed by applying a paint having resistance, and the surface of the smoked chromium plating is roughened with an etchant to form a conductive thin film, and then trivalent chromium plating is performed. Perform masking toward the inside with a gap from the parting part with the film, and in the gap and the resist coating where this masking is not performed, trivalent chromium plating Characterized in that painted a desired color of paint with a force application to form a top coating film.

The resist paint must have resistance to plating treatment such as roughening by etching of the base material and strong acid treatment for activation. For example, acrylic or epoxy paint is used. Topcoat coatings require adhesion to resist coatings and good appearance quality, and have a higher microporous density and lower inertness than hexavalent chromium plating, resulting in a highly crosslinked finish. Sufficient adhesion can be obtained even with an excellent acrylic urethane-based paint.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a method for producing a smoked chrome plating / coating combination decorative body of the present invention is applied to an emblem 9 in FIG. 3 will be described with reference to FIG. Masking is performed on the area of the smoked chrome-plated portion 1 of the synthetic resin base material 5, and an acid-resistant acrylic, epoxy, etc. A resist paint is applied by, for example, spraying to form a resist coating film 11 for plating.

The masked area is roughened by etching the substrate 5 with a strongly acidic chemical, a chemical nickel film, that is, a conductive thin film is formed in the area, and copper plating or bright nickel The surface is plated with trivalent chromium 10 by performing a treatment such as plating.

The inside of the trivalent chromium plating portion with a gap 13a from the parting portion with the resist coating film 11 is masked with a masking tape 13, for example. In this unmasked area, for example, an acrylic urethane-based paint having a strong adhesion to the trivalent chromium plating 10 and having a high degree of cross-linking of a desired color and having an excellent appearance is applied by, for example, spraying to form a top coat 12. To form

At this time, the overcoat 12 covers the gap 13a of the trivalent chromium plating 10 so as to cover the resist coating 11 which has deteriorated in smoothness during the pretreatment of plating, and to significantly reduce the surface polar groups more than the chromium plating. A stable coating film is formed by the adhesion with the resist coating film 11 which has a large amount of chromium, and also by the adhesion with the trivalent chromium plating 10 having high density microporous (micropores) and low inertness. The trivalent chromium plating 10 having a deep color tone itself becomes smoked without performing the smoke clear coating. Further, since the degree of inertness is low, washing can be effectively performed even if the purity of the washing water is relatively low. The reason is that the resist coating 11
If it is intended to replace itself with a top coat, the surface will be delicately violated by plating and the appearance will deteriorate, making it difficult to maintain a good appearance.

FIG. 4 shows a radiator grill according to another embodiment in combination with a smoked chrome plated portion 1A formed by trivalent chromium plating 10 and a coating portion 2A formed by a top coat 12. Further, as the top coat 12, a paint having a less severe condition in terms of adhesion performance than a paint usually applied to chromium plating and having a high degree of cross-linking and excellent finish appearance can be used.

[0012]

As described above, according to the present invention, the use of trivalent chromium plating eliminates the need for a smoke-clear coating and prevents the smoke-clear portion of the decorative body from being deteriorated by ultraviolet rays. The amount of expensive trivalent chromium plating can be reduced by the area of the resist coating film, and it is also advantageous in terms of environmental pollution. The top coating film penetrates slightly from the parting part to the plating part and hides the resist coating, and due to the high density and inertness of the microporous trivalent chromium plating, it adheres securely to the plating part, and the stable coating film Is obtained. By improving the adhesion between the top coat and the plated portion, the selection range of the top coat is also widened.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view for explaining a method of manufacturing an emblem using a combination of smoked chrome plating and a coating film according to the present invention.

FIG. 2 is a cross-sectional view illustrating a conventional method for manufacturing the emblem.

FIG. 3 is a plan view of the emblem of FIGS. 1 and 2;

FIG. 4 shows smoke chrome plating according to another embodiment.
It is a front view of the radiator grill which is a coating-film combination decorative body.

[Explanation of symbols]

 Reference Signs List 5 base material 10 trivalent chromium plating 11 resist coating film 12 top coating film 13 masking tape

Claims (3)

[Claims] 1. A method of manufacturing a smoke chrome plating / coating combination decorative body by combining a smoke chrome plating portion and a coating portion formed on a synthetic resin base material, wherein the smoke chrome plating portion of the base material is masked. Do
On the coating portion where this masking is not performed, a resist coating is formed by applying a paint having resistance to the plating process including the surface roughening of the base material, and the smoke chrome plating portion is etched. After forming a conductive thin film by roughening the surface with an agent, trivalent chromium plating is performed, and the trivalent chromium plating portion is masked toward the inner side with a gap from the parting portion with the resist coating film,
Smoke chrome plating, characterized in that a paint of a desired color having an adhesive force to trivalent chromium plating is applied to the gaps and the resist coating film where the masking is not performed to form an overcoating film.・ Production method of paint film combination decoration. 2. The decorative article according to claim 1, wherein the etchant has an acidic property and the paint for forming the resist coating is an acrylic or epoxy-based coating. Production method. 3. The method according to claim 1, wherein the paint forming the top coat is an acrylic urethane paint.