JPS6191363A - Method for subjecting plastic to electroless plating - Google Patents

Abstract

PURPOSE:To form plating having superior adhesion and a fine appearance on plastics by electroless plating by forming a film of a mixture of ABS resin with nitrile rubber on the surface of the plastics and carrying out etching and electroless plating. CONSTITUTION:A film 2 of a mixture of ABS resin with nitrile rubber is formed on the surface 1 of plastics to be subjected to electroless plating. The film 2 is chemically etched, known catalyst nuclei 3 are formed, and electroless plating 4 is carried out. Synthetic rubber such as chloroprene rubber or urethane rubber may be added to the nitrile rubber in the film 2 according to the kind of the plastics used as a base.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for electroless plating on plastics.

[Conventional technology]

Conventional electroless plating on plastic is performed by etching the material (1) with an organic solvent, oxidizing agent, acid, alkali, etc. (5) as shown in Figure 2, and then forming a tin (II)-palladium (I) plate.
I) A common method is to adsorb (3) and then apply electroless plating (4).

However, according to the conventional technology, the precipitation of electroless plating is
Ease of use 1. Most materials that can satisfy all of the throwing power, appearance, and adhesion of plating are limited to ABS thread resins, but the physical and chemical properties of ABS resins are not very good. In addition, although several plating grade resins are released by various material manufacturers, they have the disadvantage that their various physical and chemical properties are limited and their applications are limited. The scope of application of plating was extremely narrow. Furthermore, in order to eliminate these drawbacks, ABS resin coating agents for the method shown in FIG. 5 are commercially available. That is, the material (1) is chemically and physically activated, and (5) the above-mentioned commercially available coating agent (5) is coated.
) is formed and then (C) electroless plating (4) is applied. However, while the above method improves the adhesion between the plating and coating layer, the process of activating the material is equipment-intensive and
It is disadvantageous in terms of man-hours, and even after activation, depending on the type of material, it may not be possible to obtain sufficient adhesion between the material and the coating agent, so it cannot be widely applied to plastics in general.

[Problem that the invention seeks to solve]

As mentioned above, the conventional technology has the problem that the coverage of electroless plating is unclear, and plating with good appearance and good adhesion of the plating layer can only be applied to a limited number of materials, and the range of application is extremely narrow. The present invention is intended to solve these problems.1
．． The purpose is to make it possible to apply electroless plating with excellent plating coverage, appearance, and adhesion to all known plastics, plastic mixtures, and inorganic-containing plastics.

[Failure to solve the problem]

As shown in Fig. 1, the method of plating on plastic according to the present invention involves forming a film (2) of a mixture of ABS resin and nitrile rubber on the plastic surface (1) on which electroless plating is to be applied. B) Thereafter, chemical etching treatment and well-known formation of catalyst nuclei (6) are performed, and (c) electroless plating (4) is performed.

Depending on the type of underlying plastic, nitrile rubber in the mixture film may contain chlora 7'lene rubber,
One or more types of synthetic rubbers such as urethane rubber or synthetic resins such as epoxy resins and phenolic resins may be mixed, and the mixture film formed by the method of the present invention may also be used. The composition is free as long as it contains the necessary elements, and α5μ is used to ensure the coverage and adhesion of filter plating.
It is preferable to have a thickness of m or more.

Hereinafter, the present invention will be explained in detail according to examples.

[Example 1] The present invention was applied to electroless plating on nylon-6.

The following coating liquid was used.

The coating was done using a constant velocity pulling method, with a thickness of 4mm and 5μm.
After coating, forced drying was performed at 150° C. for 1 hour.

The coated nylon was etched with a chromium-sulfuric acid mixture having the following composition at 60°C for 2 minutes, neutralized with sodium sulfite, and then subjected to a well-known electroless pretreatment process: stannous chloride-palladium chloride-hydrochloric acid. Electroless nickel plating was applied after dipping in a catalyst system and sulfuric acid accelerator.

(Etching Solution) A comparison between the conventional electroless plating method for nylon-6 and the present invention will be shown below.

Table 1. As is clear from Comparison Table 1 of electroless plating on nylon-6, according to the present invention, electroless plating on nylon-6, which is generally coated with electroless nickel and difficult to obtain adhesion, is improved. It has become possible to improve plating characteristics. In addition, this example applies to all other nylons such as nylon-66 and Renny nylon.
Item 1 applies.

[Example 2] The present invention was applied to electroless plating on phenolic resin.

The following coating agent was used.

A spray coating method was used using a coach ink fly air spray gun, and the thickness was 20 μm. 16 after coating
Forced drying was performed at 0°C for 2 hours.

The following steps were carried out in the same manner as in Example 1, and the beer strength of the plating layer was increased from the conventional 1.1~O, 5kg-crr to 1.5~50, 9-crIL-'', and the plating layer was The appearance was also excellent.

[Example 3] The following coating agent was used in the present invention for electroless plating on polyvinyl chloride/l/, on which electroless plating is difficult to deposit.

Coating is done by flow coater method to a thickness of 30μm.
And so. After coating, forced drying was performed at 60° C. for 5 hours.

The following steps were carried out in the same manner as in Example 1. Electroless plating with a heavy beer strength of 1.5 to 2.5 kg and good adhesion of crIL"l was performed on polyvinyl chloride, on which the precipitation of conventional electroless plating was regression. A layer was formed.

[Example 4] In the same manner as in Example 1, electroless plating was applied to nylon-6 containing glass fiber and metal powder.

However, the coating agent was as follows, and the coating method was the spin cord method, and several thickness levels were obtained, and the plating adhesion (beer strength) was summarized in Table 2.

(Coating agent composition) Table 2. As is clear from the electroless plating comparison table 2 on nylon-6, the coating thickness is CL5μm.
The above is desirable, and adhesion was found to be correlated with coating thickness. However, the coating thickness is 5 pm.
Above, it is stable within the range of approximately 1.0 to 2.5 and 9 cm-'.

〔Effect of the invention〕

As described above, according to the present invention, by applying an ABS-nitrile rubber coating to the plastic surface of the object to be plated, it is possible to achieve excellent adhesion and appearance even on plastic materials for which electroless plating is normally difficult. It has the effect of allowing electroless plating to be performed and expanding the possibilities of metallizing plastics.

Note that the present invention can be applied to molded products, sheets, etc. of all plastics and composite plastics.

[Brief explanation of drawings]

FIGS. 1A-1D are cross-sectional views showing the electroless plating process of the present invention. Figures 2A-C and 5A-D are process diagrams 1 of the conventional method...
Plastic base 2...ABS thread resin + Nitri-based rubber layer 5...Catalyst 4...Electroless plating layer 5...ABS coating layer or above

Claims (3)

[Claims] (1) Electroless plating on plastic, which is characterized by forming a film of a mixture of ABS resin and nitrile rubber on the surface of the plastic to be electrolessly plated, and then performing etching treatment and electroless plating treatment. Method. (2) In the above film composition, a part of the nitrile rubber is replaced by at least one or more of synthetic rubbers such as chloroprene rubber and urethane rubber, or synthetic resins such as epoxy resins, acrylic resins, and phenolic resins. A method for electroless plating on plastics according to claim 1, wherein the method is replaced with a mixture of. (3) The method for electroless plating on plastics according to claim 1 or 2, wherein the thickness of the film formed on the plastic surface is at least 0.5 μm or more.