JPS608712B2 - Resin composition for plating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plating resin composition that can be plated without electroless lacquering.

Traditionally, plastics have been used in various fields as materials for plated products, but these plastics are nonconductors and cannot be electroplated directly, requiring complex pretreatment processes as shown below. .

Compared to plastic plating and metal plating, which require many, complex, and difficult-to-manage processing steps as described above, they are more difficult to manage due to pollution caused by waste liquid from each processing step and the complexity of the process. There are many problems such as variations in product quality and rising costs.

The present inventors have arrived at the present invention as a result of extensive research into a resin composition for plating that allows plating to be performed in a simpler and more economically advantageous method than conventional plating methods. The present invention relates to a plating resin composition that can be plated without electroless scale plating, which is indispensable for conventional plating resin compositions.

That is, in the present invention, the thermoplastic resin contains 10 parts by weight of one or more thermoplastic resins, has an oil absorption of 200 M (DBP)/100 parts or more, and has a surface area of 500 parts or more by nitrogen adsorption method.

The carbon black 'B' is composed of 3 to 10 parts by weight, and is further characterized in that it has a volume resistivity value of 1 pi or less, and can be electroplated directly after an accelerator or activating treatment. This is a resin composition for plating.

To explain the present invention in more detail, the thermoplastic resin used in the present invention is a copolymer (ABS resin) consisting of vinyl cyanide, aromatic vinyl, and conjugated diene rubber.
, polypropylene resin, vinyl chloride resin, polystyrene resin, polycarbonate resin, methacrylic resin, polysulfone resin, polyester resin, polyacetal resin,
Polyamide resin, AS (vinyl aromatic pinylucyanide) resin, polyphenylene oxide resin and BVA (
These include ethylene-vinyl acetate) resin, polyethylene resin, etc., and can be used alone or in combination of two or more.

In the case of two or more types, a mixture of polyphenylene oxide resin and polystyrene resin, a mixture of polypropylene resin and polyethylene resin, and a copolymer consisting of pynyl cyanide, aromatic vinyl, and conjugated diene rubber can be used. ,
Examples include mixing with one or more resins selected from the group consisting of vinyl chloride resin, polycarbonate resin, methacrylic resin, polysulfone resin, polyacetal resin, aromatic vinyl cyanide resin, and polyphenylene oxide resin. .

Further, usual auxiliary agents such as a paste, an antioxidant, a plasticizer, a filler, etc. may be added.

The carbon black curve used in the present invention has an oil absorption of 2
00/100 ta or more, and the surface area needs to be 500/ta or more.

With carbon black outside this range, no matter which thermoplastic resin is used, even if directly electroplated after accelerator or activating treatment, a transparent film may not be formed, or even if it is, a good plated product may not be formed. is not obtained. Carbon black relative to 10 parts by weight of thermoplastic resin
The amount of B is from 3 to 10 parts by weight, and if it is less than 3 parts by weight, even if the carbon black has an oil absorption of 200/1002 or more and a surface area of 500/ta or more, a glaze film will form. No staff available.

Moreover, if it exceeds 10 parts by weight, the physical properties of the molded product will be significantly inferior,
It cannot be put to practical use. More preferably, 5 to
7 parts by weight, most preferably 8 to 25 parts by weight. Note that oil absorption is defined in JISK-6221-1975.
It means the value measured according to the following, and is the amount of DBP (dibutyl phthalate) measured by an absorptometer in units of secretion/100 hours. What is surface area? ASTM
This is a value measured in accordance with 3037-73, and is expressed in units of 〆'.

If the oil absorption amount of carbon black [B] is less than 200 l/100 ta or the surface area is less than 500 l/ta, a product with a satisfactory deposited coating cannot be obtained. 'In the present invention, the volume resistivity of the composition must be less than or equal to 1 pi.

If it exceeds 1 piQ.g, a product with a satisfactory tortoise coating cannot be obtained.

More preferably, it is less than 1 and Q. The volume resistivity value is defined by British Snendard 2044 (
The values measured according to Method 2) are evaluated.

According to the present invention, electroplating can be performed directly after the accelerator or activating treatment, thereby omitting the electroless plating step that was not necessary in the conventional manufacturing method of plated products. be able to.

Therefore, there is no need for the electroless lacquering liquid required in the electroless lacquering process, and not only can the cost of reagents be greatly reduced, but there is also no cost for waste liquid treatment.

Since it is simpler than conventional treatment processes, it is easier to manage the treatment liquid and increase production. Further, since the etching treatment can be performed sufficiently with an etching treatment solution having a low chromium concentration, it is advantageous in terms of pollution control.

Examples will be described below, but the present invention is not limited thereto.

Example 1 Thermoplastic resin and carbon black are shown in Table 1.
200℃ in a Banbury mixer at the ratio shown in ■～■
, and kneaded for 8 minutes to obtain a composition.

Thereafter, a flat plate of 70 x 14 x 2 sides was formed from the composition and etched with an etching solution of 3M chromic anhydride/500 concentrated sulfuric acid (75q0 x 10 minutes), manufactured by Okuno Pharmaceutical Co., Ltd. Neutralization treatment with D-25 neutralizing agent, catalyst treatment with A-30 catalyst liquid manufactured by Okuno Pharmaceutical Co., Ltd., and accelerator treatment with D-25 accelerator liquid manufactured by Okuno Pharmaceutical Co., Ltd., and immediately after that, sulfuric acid steel 200 / evening,
Strike plating is performed at a current density of IA'd in a 50% sulfuric acid/electric steel plating bath, and then 3.5A/d.
Finally, the current density was increased and main plating was performed.

In addition, C, 0 using polypropylene and polyester
, K, S, and T, sensitizing processing using TM yen sensitizer manufactured by Okuno Pharmaceutical Co., Ltd. instead of catalyst processing, and activation processing using TM yen activator manufactured by Okuno Pharmaceutical Co., Ltd. instead of accelerator processing. I did it.

Example 1 Table 1-■ Example 1 Table 1-■ Example 1 Table 1-■ Example 2 As shown in Tables 2 and 3, various thermoplastic resin compositions and carbon black were flooded in the same manner as in Example 1. The mixture was kneaded and formed into a flat plate.

These flat plates were subjected to the same accelerator treatment as in Example 1, and then directly subjected to strike plating and main plating.

Example 2 Table 2 Example 2 Table 3

Claims (1)

[Claims] 1. 100 parts by weight of one or more thermoplastic resins (A), an oil absorption of 200 ml (DBP)/100 g or more, and a surface area of 500 m^2/g or more by nitrogen adsorption method. It is characterized by comprising 3 to 100 parts by weight of certain carbon black (B), having a volume resistivity of 10^3 Ωcm or less, and being able to be directly electroplated after accelerator or activating treatment. Resin composition for plating. 2. The resin composition for plating according to item 1 above, wherein the thermoplastic resin is a copolymer consisting of vinyl cyanide, aromatic vinyl, and conjugated diene rubber. 3. The first above, wherein the thermoplastic resin is a polypropylene resin.
The resin composition for plating as described in . 4. The resin composition for plating according to item 1 above, wherein the thermoplastic resin is a vinyl chloride resin. 5. The resin composition for plating according to item 1 above, wherein the thermoplastic resin is a polystyrene resin. 6. The resin composition for plating according to item 1 above, wherein the thermoplastic resin is a polycarbonate resin. 7. The resin composition for plating according to item 1 above, wherein the thermoplastic resin is a methacrylic resin. 8. The resin composition for plating according to item 1 above, wherein the thermoplastic resin is a polysulfone resin. 9. The first above, wherein the thermoplastic resin is a polyacetal resin.
The resin composition for plating as described in . 10. The resin composition for plating according to item 1 above, wherein the thermoplastic resin is a polyamide resin. 11. The resin composition for plating according to item 1 above, wherein the thermoplastic resin is an aromatic vinyl-cyanide vinyl resin. 12. The resin composition for plating according to item 1 above, wherein the thermoplastic resin is a polyphenylene oxide resin. 13. The resin composition for plating according to item 1 above, wherein the thermoplastic resin is an ethylene-vinyl acetate resin. 14 The first above, wherein the thermoplastic resin is a polyethylene resin.
The resin composition for plating as described in . 15. The resin composition for plating according to item 1 above, wherein the thermoplastic resin is a mixture of polyphenylene oxide resin and polystyrene resin. 16. The resin composition for plating according to item 1 above, wherein the thermoplastic resin is a mixture of polypropylene resin and polyethylene resin. 17 A copolymer in which the thermoplastic resin is made of vinyl cyanide, vinyl aromatic and conjugated diene rubber, vinyl chloride resin, polycarbonate resin, methacrylic resin, polysulfone resin, polyacetal resin, aromatic vinyl-vinyl cyanide resin and poly The resin composition for plating according to the above item 1, which is a resin mixed with one or more resins selected from the group consisting of phenylene oxide resins. 18. The resin composition for plating according to items 2 to 17 above, wherein the carbon black (B) is 5 to 70 parts by weight. 19. The resin composition for plating according to item 18 above, which has a volume resistivity of 10^2 Ω·cm or less.