JPS5950257B2 - Resin composition for plating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plating resin composition that allows electroplating to be applied directly to molded articles without chemical plating.

Traditionally, carbon black and sulfur, etc. were added to a rubber-based base to give it conductivity, and direct electroplating was performed, but since it is mainly made of rubber, it lacks rigidity and requires the use of sulfur. Therefore, in order to increase the adhesion to the plated metal, it is necessary to ripen it in air or under certain environmental conditions for several days, which caused various problems such as sulfur blooming during aging or storage. .

Furthermore, since the molded product is mainly made of rubber, scratches or pinholes are likely to occur in the molded product, and even if the molded product is plated, these defects will continue to appear. The present invention solves these problems and further increases the adhesion of plating.

That is, in the present invention, ethylene-propylene copolymer (hereinafter referred to as EPR) is used for 100 parts by weight of thermoplastic resin. Or ethylene propylene diene terpolymerization book (hereinafter referred to as EPD)
It's called M. ) 1 to 30 parts by weight, carbon black 15 to
70 parts by weight of sulfur, 0.05 to 7 parts by weight of sulfur, and 1 to 20 parts by weight of metal powder or metal sulfide. Thermoplastic resins in the present invention include polyethylene, polypropylene, ethylene propylene copolymer, ethylene propylene diene terpolymer, ethylene vinyl acetate copolymer, polyvinyl chloride, polystyrene, polyacetal, 6 | 6-6 | 6- Polyamides such as 10, 6-12, 11|12, polyphenylene sulfide (PPS), polyphenylene oxide (PPO), polybutylene terephthalate (PBT), polyethylene terephthalate (
PET), ABS, AS) polymethylpentene, styrene-ptadiene-styrene copolymer (SBS), polycarbonate, etc.

As carbon black, acetylene black, furnace black, channel black, butcher black, etc. are used.

Metal powders include Nikkal, iron, zinc, chromium, copper, aluminum, etc. Metal sulfides include zinc sulfide, antimony sulfide, aluminum sulfide, gold sulfide, silver sulfide, chromium sulfide, lead sulfide, strontium sulfide, tin sulfide, and sulfide. Titanium, iron sulfide, copper sulfide, nickel sulfide, vanadium sulfide, palladium sulfide, barium sulfide, cadmium sulfide, bismuth sulfide, arsenic sulfide, boron sulfide, beryllium sulfide, magnesium sulfide, manganese sulfide, etc. are used.

The carbon black blended in the present invention imparts electrical conductivity to the thermoplastic resin, and the larger the amount, the better the electrical conductivity, but if it exceeds 70 parts by weight per 100 parts by weight of the thermoplastic resin, fluidity deteriorates. Not only is molding difficult, but the impact resistance and appearance of plating are also deteriorated.

If the amount is less than 15 parts by weight, the conductivity will not be improved and electroplating will not be possible. EPR or EPDM improves impact resistance and also improves plating adhesion. However, if the amount of EPR or EPDM exceeds 30 parts by weight per 100 parts by weight of the thermoplastic resin, the bending strength will decrease and the appearance of the plating will deteriorate. If the amount is less than 1 part by weight, the adhesion strength of the plating will be low. Next, the addition of sulfur is essential for improving the adhesion strength of plating, but it produces an odor during the manufacturing process of the molding material or during molding, making it undesirable during work. When stored, sulfur blooms on the surface of the molded product, and when it is subsequently plated, the appearance of the plated product deteriorates significantly. According to research conducted by the present inventors, it has been found that the combined use of metal powder or metal sulfide eliminates the odor during work and lengthens the number of days in which sulfur blooming occurs. That is, by mixing 0.05 to 7 parts by weight of sulfur and 1 to 20 parts by weight of metal or metal sulfide to 100 parts by weight of thermoplastic resin, the desired plating adhesion strength can be obtained and there is no odor during operation. It was also found that the number of days during which blooming occurred was increased. The object of the present invention is to completely omit the electroless plating (chemical plating) process and to provide a thermoplastic resin composition that can be directly electroplated. , Metsuki running time is 5 minutes / D77
! It must have a plating adhesion strength of 2.0 kg/me or more within 100 lbs., and the plating appearance must be good with no pinholes or the like.

Other purposes include that the composition of the present invention has fluidity that allows injection molding, extrusion molding, etc., has no odor during work, is resistant to sulfur blooming during storage of molded products, etc., and does not bloom for more than 1 month. In addition, it has mechanical strength that can withstand practical use. The object of the present invention is to provide a resin composition for plating that satisfies all of the above objects. In addition to the composition, the present invention also includes stabilizers, lubricants, anti-aging agents,
ZnO, MgO, Mg(0H)2, A1(0H)3, C
Other fillers such as aC03, talc, glass fiber, Sb
Other additives such as flame retardants such as 2O3, ZnBO3, chlorinated paraffin, hexabromobenzene, and decabromodiphenyl oxide may also be blended. This will be explained in detail in Examples below.

Example 1 The thermoplastic resin was polypropylene (manufactured by Sumitomo Chemical Co., Ltd., Sumitomo Noblen, W53l), the EPR was Mitsui Petrochemical Industries, Ltd., Tafuma-1 PO68O, and the carbon black was Vull-CanX, manufactured by Kabot Corporation of America.
C-7 2. Nickel sulfide (NiS) as metal sulfide
In addition, sulfur was mixed as shown in Table 1.

These compositions were stirred and mixed in a blender for 5 minutes, and
Kneading and extrusion compound pellets were obtained using a continuous shaft extruder (65 m/m).

The pellets were dried at 110°C for 3 hours and molded into 3 mm thick, 10
A disk with a diameter of 0 m and a surface area of approximately 1.6 dm was molded, and its characteristics were evaluated by conducting various tests and directly electroplating under the following plating conditions. After the plating conditions (strike nickel; Watt bath), copper sulfate bath or various Put it in the Metsuki bathtub.

The characteristic is melt index (MI) as fluidity.
, Odor as workability, number of days of blooming as storage property, Izotsu impact strength and bending strength as impact resistance, peeling test as adhesion strength of plating, number of pits as appearance of plating, and throw time of strike nickel plating. Each was measured and the results shown in Table 1 were obtained.
As a comprehensive evaluation, ○ marks are those that satisfy the present invention, × marks are those that do not satisfy the present invention, and all the products of the present invention have achieved their objectives. Example 2 Nylon 610 manufactured by Ube Industries, Ltd. as a thermoplastic resin
13B1 Polyacetal Yuracon M9O manufactured by Polyplastics Co., Ltd., Polypropylene 1 Sumitomo Nochoblen W-531 manufactured by Sumitomo Chemical Co., Ltd., Tafuma 1 PO68O manufactured by Mitsui Petrochemical Industries, Ltd. as EPR, Japan Synthetic Rubber Co., Ltd. as EPDM EP-57P, carbon black Vul-CanXC-72 manufactured by Kabot Corporation in the United States, metals such as zinc sulfide, iron sulfide, copper powder, aluminum powder,
and sulfur were mixed as shown in Table 2 and examined in the same manner as in Example 1, and the results shown in Table 2 were obtained.

All of the products of the present invention satisfy the objectives.

Claims (1)

[Claims] 1 1 to 30 parts by weight of ethylene/propylene copolymer or ethylene/propylene/diene terpolymer, 15 to 70 parts by weight of carbon black per 100 parts by weight of thermoplastic resin
1. A resin composition for plating, characterized in that it contains 0.05 to 7 parts by weight of sulfur, and 1 to 20 parts by weight of metal powder or metal sulfide.