JPS6039151B2 - Resin surface treatment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating a resin surface that can provide a surface coating with excellent adhesion.

For example, since polyacetal resin has poor surface activity, it is necessary to first phase the resin surface with an acidic or oxidative etching agent and then immerse it in a pretreatment solution and a chemical plating solution for chemical plating, or to perform surface treatment such as painting. I was going. However, with conventional etching agents, when a resin molded product is crushed,
Air bubbles form on the surface of the molded product, and the etching agent does not adhere to this area, making it impossible to roughen the surface.Therefore, even if this area is plated, a smooth surface remains, so the surface of the molded product must be sufficiently plated. The disadvantage was that it could not be adhered to the surface of the substrate, and peeling and cracking were likely to occur.

This invention was made with attention to this point, and by adding an acid-resistant surfactant to a mixed solution of phosphoric acid and sulfuric acid, bubbles generated on the surface of the molded product are removed and a uniform surface roughening is achieved. They discovered that plating treatment with excellent adhesion can be performed and completed this invention.

That is, the resin surface treatment method according to the present invention is a treatment method for etching the surface of a resin such as polyacetal resin, in which a resin molded article is immersed in an etching solution prepared by adding an acid-resistant surfactant to a mixed solution of phosphoric acid and sulfuric acid. It is characterized by the fact that

According to this invention, by immersing a resin molded product such as polyacetal resin in the etching agent, air bubbles generated on the surface of the molded product are removed, and the molded product can be uniformly removed without deteriorating the mechanical strength of the resin material itself. Since the surface is roughened, it is possible to form not only a metal plating layer but also a strong surface coating such as a coating layer by painting, or bonding with another type of resin by fusion or adhesion.

Next, the present invention will be specifically explained using an example in which a metal plating layer is formed on a polyacetal resin.

First, a large number of polyacetal resin molded articles were degreased for 1 minute in trichlene vapor, and then dried for 3 minutes in air maintained at a temperature of 150 qC.

On the other hand, an etching solution was prepared by mixing the components shown in Table 1 below.

Table 1 Sulfuric acid (95%) 300 [/sorinic acid (
85%) 200M/acid resistant surfactant
0.01-5% (Colorum based or ethylene oxide based) Water The remainder The treatment liquid (surfactant) was changed as shown in Table 2 for the numerous polyacetal resin molded products mentioned above, and the products were classified into three types. .

Table 2 Neck Treatment liquid A Furohata-based surfactant B Ethylene oxide-based surfactant C Phosphoric acid-water Of these, A and B were treated with an etching solution, then neutralization and hot water washing were omitted. I only washed with water.

After C was immersed in 85% phosphoric acid solution, it was neutralized and washed with a moat. The resin molded product was immersed twice in each etching solution, the first time was immersed in a 40 OO solution for 30 minutes, and the second time was immersed in a 4000 ml solution for 30 minutes.
0oo solution for 10 minutes. After the resin molded product had been turned into a sludge, the resin molded product was subjected to sensitization and activation treatment using a commercially available pre-treatment liquid for plastic plating shown in Table 3. Table 3 <Sensitization> Stannous chloride 2/3 Hydrochloric acid (35%) 5cc liquid temperature
25~30q○ Soaking time
i. 8 minutes <activation> Palladium chloride 0.15 minutes/sohydrochloric acid
2cc/evening liquid temperature
25~300○ Bond immersion time
The resin molded product subjected to the above sensitization and activation treatment for 1.5 minutes was treated with a commercially available ammoniacal chemical nickel plating solution, and then acidic bright copper laminate was exposed to a thickness of 30 mm. After that, a cut of one skin width was made and the peel strength was examined using a tensile tester.

The results are shown in Tables 3 and 4.

Tables 4 and 5 show the cases where the etching solution temperature was 40 oo and 5000, and the immersion time was 20 minutes and 10 minutes, respectively. Table 4 (Unit title) Table 5
(Unit Thai skin) As is clear from Tables 4 and 5, A and B, that is, those made by the method of this invention, both significantly exceed the practical limit of peel strength of 600 g/melon and have excellent adhesion. I understand. Since this invention is based on the above, it is possible to apply a device coating with excellent adhesion strength to resin molded products such as polyacetal resin, and it is also possible to apply a device coating with excellent adhesion strength to resin molded products such as polyacetal resin, and it is also possible to apply a coating with a device having excellent adhesion strength to a molded product made of resin such as polyacetal resin. As a result, the surface treatment time can be shortened.

Claims (1)

[Claims] 1. A method for etching the surface of a resin such as polyacetal resin, which comprises immersing a resin molded article in an etching solution prepared by adding an acid-resistant surfactant to a mixed solution of phosphoric acid and sulfuric acid.