JPH11124681A - Plating method for polycarbonate or (and) abs resin molded goods - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reform the surfaces of resin molded goods and to impart hydrophilicity thereto by bringing the molded goods into contact with fluorine for a specific time under an atmosphere of a specific fluorine concn. and specifying the contact angle of the surfaces to a specific value or below. SOLUTION: The polycarbonate or ABS resin molded goods are brought into contact with the fluorine for 1 to 30 minutes, more preferably 1 to 15 minutes under an atmosphere of 0.1 to 10% in the fluorine concn. If the long- time treatment is executed with the gaseous fluorine of the excessively high concn. in this case, the direction of water repellence is resulted and, therefore, such treatment is disadvantageous. As a result, the contact angle is confined to <=80 deg. by imparting hydrophilicity to the contact surfaces. The fluorine concn. refers to the content of the fluorine in a gaseous mixture composed of the gaseous fluorine and another inert gas. N2 , Ar, He, CO2 , etc., are used as the inert gas. The surfaces of the resins fluorinated by this treatment are made flat and plating is adhered thereto by the high polar force imparted by the fluorine. Ordinary electroless plating is applied to the plating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of plating a molded article of polycarbonate or (and) ABS resin, and more particularly, to a method of plating a molded article of polycarbonate or ABS resin which has been conventionally difficult by a very simple method. Regarding possible methods.

[0002]

2. Description of the Related Art The surface of polycarbonate or ABS resin has a large hydrophobicity, and it is very difficult to perform plating as it is. In order to perform plating on the surface of a polycarbonate or ABS resin, a method is known in which the surface is made polar by etching with a chromium-sulfuric acid solution.

[0003] However, in the treatment of polycarbonate or ABS resin by this method, it is difficult to treat chromic sulfuric acid as an etching agent, which has a serious problem in environmental measures.

[0004]

SUMMARY OF THE INVENTION The present invention has developed a method of easily modifying the surface of a polycarbonate or ABS resin using fluorine to impart hydrophilicity, and then plating, preferably electroless plating thereon. Is to do.

[0005]

The object of the present invention is to provide a molded article of polycarbonate or (and) ABS resin in an atmosphere having a fluorine concentration of 0.1 to 10% for 1 to 30 minutes, preferably 1 to 30 minutes.
The problem can be solved by contacting for about 15 minutes to reduce the contact angle of the surface to 80 degrees or less, and then performing plating according to a conventional method.

The present inventor has already found that when a polypropylene molded article is brought into contact with fluorine to make its surface hydrophilic,
It was found that the surface could be plated well, and an application was already filed (JP-A-8-302039).

[0007]

In the following research, the present inventor has found that polycarbonate and ABS resin, which are extremely difficult to be plated like polypropylene, are completely different from polypropylene due to chemical common sense. It has been found that plating can be performed well by contacting with fluorine and then plating. That is, when the surface of a polycarbonate or ABS resin molded product is treated with a dilute fluorine concentration for a short period of time, usually 1 to 30 minutes, at room temperature, the contact angle of the surface with water decreases, and is 80 ° or less, and in the case of a remarkable 7 ° C.
It has been found that when the temperature is reduced to 0 degrees or less, and then plating is performed on this in accordance with a conventional method, plating can be performed successfully. The present invention has been completed based on this new finding.

The fluorination of polycarbonate and ABS resin was performed for 10 minutes while changing the fluorine concentration, and the effect on the contact angle was examined. The results are shown in Table 1.

[0009]

[Table 1]

It has been found that as the fluorine concentration increases, the contact angle increases. Table 2 shows the results of examining the effect of the fluorination time at a fluorine concentration of 2%. It was observed that the contact angle increased with increasing time.

[0011]

[Table 2]

However, Table 1 shows the results obtained by using molded products of polycarbonate and ABS resin at room temperature.
In the case where the fluorine concentration is 2%, only the fluorination time is changed.

Electron micrographs were taken of the surfaces of the polycarbonate and ABS resin before and after fluorination, and the surface condition was examined. No difference was found in the surface roughness.

The surface of the fluorinated polycarbonate or ABS resin obtained by the treatment method of the present invention is flat. Therefore, it is considered that the plating adheres due to the strong polar force exerted by fluorine. If the treatment is performed at a high concentration of fluorine gas or for a long time, water repellency is obtained.
Minutes, preferably 1 to 15 minutes, particularly preferably 1 to 10 minutes.

After the surface of polycarbonate or ABS resin is treated with fluorine, it is subjected to electroless plating, and the surface is subjected to JIS 8
A peel test was performed by the method of 630. As a result, those having a contact angle of 80 degrees or less did not peel at all. When it exceeded 80 degrees, no plating was applied. As a result, good results cannot be obtained for the plating adhesion unless the contact angle is not more than 80 degrees.

The fluorine concentration in the present invention is 0.1 to 10%.
Indicates a gas containing 0.1 to 10% of fluorine in a mixed gas of fluorine gas and another inert gas. Examples of the inert gas include N ₂ , argon helium, carbon dioxide gas and the like. Is used. At this time, the concentration is 0.1%
If it is less than 10%, the desired effect is hardly obtained, and if it exceeds 10%, the contact angle cannot be reduced to 80 degrees or less as already described.

The means for making the contact is not particularly limited, and any means may be used as long as the entire surface of the polycarbonate or ABS resin molded article is in uniform contact.

When plating is performed, plating may be performed according to a conventional plating method, and usually, electroless plating is applied.

[0019]

The present invention will be described more specifically with reference to the following examples.

[0020]

Example 1 Each sample having a fluorine concentration of 2% obtained in Table 1 was subjected to electroless plating of nickel. After washing the surface of the sample with ultrapure water, tin chloride (SnCl ₂ : 40 g /
L, HCl (37%): 40 mL / L) at room temperature for 3 minutes. After washing with water, palladium chloride (PdCl ₂ :
It was immersed in a solution of 0.2 g / L, HCL (37%): 3 mL / L) at room temperature for 3 minutes. After washing with water, nickel plating bath (nickel hypophosphite: 26.7 g / L, boric acid: 12.0 g /
L, ammonium sulfate: 2.6 g / L, sodium sulfate: 4.9 g / L) and plated at 25-30 ° C. for 1 hour. After stabilizing the plated test piece at 60 ° C for 1 hour, make a cut at 1mm interval on the surface, attach adhesive tape, peel off and evaluate the number of peeled plating film out of 100 grids. And The test results are shown in Table 3. The degree of peeling was 0 when no peeling occurred.
%. However, BL is blank, BL-1 is polycarbonate not treated with fluorine, and BL-2 is
Denotes an ABS resin.

[0021]

[Table 3]

[0022]

Example 2 The sample obtained in Example 1 was subjected to copper electroless plating. After washing the surface of the sample with ultrapure water, tin chloride (SnCl ₂ : 40 g / L, HCl (37%): 4)
(0 mL / L) at room temperature for 3 minutes. After washing with water, palladium chloride (PdCl ₂ : 0.2 g / L, HCL (37
%): 3 mL / L) at room temperature for 3 minutes. After washing with water, copper plating bath (copper sulfate: 12.0 g / L, Rossel salt: 30.0 g / L, 36% formalin solution: 40 mL /
L, thiourea: 50 mg / L, pH = 12.5)
It was immersed at 70 ° C. for 1 hour for plating. Stabilize the plated test piece at 60 ° C for 1 hour, then apply 1m
Cuts were made at intervals of m, an adhesive tape was stuck, the sheet was peeled off, and the number of peeled plating films out of 100 grids was used as an evaluation value. The test results are shown in Table 4. The degree of peeling was 0% when no peeling occurred. BL-1 and BL-2 are the same as in Table 3.

[0023]

[Table 4]

Claims (1)

[Claims] 1. A polycarbonate or (and) ABS resin molded product is exposed to an atmosphere having a fluorine concentration of 0.1 to 10% in an atmosphere of 1 to 30%.
A method for plating a molded article of polycarbonate or (and) ABS resin, which comprises contacting each other to hydrophilize the surface thereof, setting the contact angle to 80 degrees or less, and then performing plating by a conventional method.