JPS5855173B2 - Manufacturing method of plated products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises thermoplastic resin (4) and carbon black (B).
The present invention relates to a new manufacturing method for obtaining plated products from a composition with.

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. .

As mentioned above, plastic plating requires many, complex, and difficult-to-manage chemical processing steps.Compared to metal plating, plastic plating suffers from pollution caused by waste limbs from each processing step, and due to the complexity of the process. There are many problems such as inconsistent product quality and rising costs.

Any thermoplastic resin requires a catalyst-accelerator-electroless plating or sensitizing-activating-electroless plating process.

In addition, in the etching process, usually - chromic anhydride 40
A processing solution with a high chromium concentration of about 0 fl/l and 200 ml/l of concentrated sulfuric acid is required.

Therefore, wastewater treatment is accompanied by the problem of chromium pollution.

In the current plating process, there are various problems when using a treatment solution with a low chromium concentration, and it is difficult to reduce the chromium concentration.

As a result of intensive research into a method that reduces the number of steps mentioned above and is beneficial from an economical and pollution prevention perspective, the inventors of the present invention have found that:
This invention has been achieved.

That is, the present invention contains 100 parts by weight of one or more thermoplastic phases (f4VA) and an oil absorption of 200 m1/
100? or more, and the surface area is 500 m2/
A molded article made of a composition consisting of 3 to 100 parts by weight of carbon black (B) which is ♂ or more and whose volume resistivity is 103 Ω/axis or less is subjected to direct electroplating after etching and neutralization treatment. This is a method for manufacturing plated products.

To explain the present invention in more detail, the thermoplastic resins used in the present invention include vinyl cyanide-aromatic vinyl-conjugated diene rubber copolymer (ABS resin), polypropylene resin, polyethylene resin, vinyl chloride resin, polystyrene resin. , polycarbonate resin, methacrylic resin, polysulfone resin, polyester tree lice polyacetal resin, polyamide resin, AS (aromatic vinyl-vinyl cyanide) resin, polyphenylene oxide resin, and EVA (ethylene-vinyl acetate) resin, etc. Two or more types of resin.

When the thermoplastic resin is two or more types of resin, mixed resins such as polyphenylene oxide resin and polystyrene resin, polypropylene resin and polyethylene resin, etc. are preferable.

In addition, ABS resin may be mixed with other resins, and as a mixture using ABS resin, ABS resin, vinyl chloride resin,
Mixed resins with one or more resins selected from the group consisting of polycarbonate resins, methacrylic resins, polysulfone resins, polyacetal resins, aromatic vinyl-cyanide vinyl resins, and polyphenylene oxide resins are also preferred.

Preferably, the ratio of ABS resin to other resin is 1 to 99:99 to 1.

Further, conventional auxiliary agents such as lubricants, antioxidants, plasticizers, fillers, etc. may be added.

The carbon black (B) used in the present invention has an oil absorption amount of 200 m1/100P or more and a surface area of 50 m1/100 P or more.
It is necessary that it is 0 m2/S' or more.

With carbon black outside this range, no matter which thermoplastic resin is used, even if electroplated directly after etching/neutralization, an electrodeposited film may not be formed, or even if it is, a good plated product cannot be obtained. do not have.

The amount of carbon black (B) per 100 parts by weight of the thermoplastic resin is 3 to 100 parts by weight, and if it is less than 3 parts by weight, the oil absorption is 2007111/1001 or more and the surface area is 500 m'/? Even with the above carbon black, an electrodeposited film cannot be formed.

Moreover, if it exceeds 100 parts by weight, the physical properties of the molded product will be significantly inferior.
It cannot be put to practical use.

More preferably, it is 5 to 70 parts by weight, and most preferably 8 to 25 parts by weight.

In addition, oil absorption means a value measured according to JIS K-62211975, and the amount of DBP (dibutyl phthalate) measured by an abutometer is 77%.
It is expressed in units of 11/100 grams.

Surface area is a value measured according to ASTM D 3037-73, m2/'? It is expressed in units of.

Oil absorption amount of carbon black (B) 200m1/100
If it is less than r or the surface area is less than 500 m2/P, a product with a satisfactory electrodeposited film cannot be obtained.

In the present invention, the volume resistivity value of the composition must be 10<3>Ω·min or less.

If it exceeds 1o2Ω·α, a product with a satisfactory electrodeposited film cannot be obtained.

More preferably, it is 102Ω·α or less.

In addition, the volume resistivity value is Br1tish S tan
dard2044 (Method 2).

According to the present invention, electroplating can be performed directly after etching and neutralization, so that catalyst, accelerator, electroless plating or sensitizing, which is not necessary in conventional methods of manufacturing plated products, can be applied directly. The activation-electroless plating process can be omitted.

Therefore, there is no need for the various treatment liquids required in each of the above-mentioned steps, and not only can the cost of reagents be significantly reduced, but there is also no cost for waste liquid treatment.

Since it is simpler than conventional processing steps, it is easier to manage the processing liquid, and the number of raw equipment can be increased.

Furthermore, etching can be carried out satisfactorily with an etching solution with a low chromium concentration, which is advantageous in terms of pollution control.

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

Example 1 The thermoplastic resin and carbon black used in the method for manufacturing plated products of the present invention were kneaded in the proportions shown in Table 1 (■ to ■) (kneaded in a Banbury mixer at 200°C for 8 minutes) to form a composition. I got it.

Thereafter, a flat plate of 70 mm x 140 x 2 sizes was formed from the composition, and chromic anhydride 301/l and sulfuric acid 500 rn
Etching treatment with etching solution of I and Q (75℃×
10 minutes), neutralized with Jitsukei Pharmaceutical Co., Ltd.'s D-25 neutralizing agent, and then directly treated with copper sulfate 2001/11 sulfuric acid 50? /l
Strike plating was performed using electrolytic copper plating at IA/dm2 in an electrolytic copper plating bath, and then main plating was performed at a current density of 3.5 A/dm2.

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

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

B5 PP E vC S C MMA A 5 ppo: EVA: Styrene-acrylonitrile- polybutadiene copolymer polypropylene polyethylene PVC polystyrene polycarbonate methacrylic resin polysulfone polyester polysecure polyamide Styrene-acrylonitrile copolymer polyphenylene oxide ethylene-vinyl acetate Sumitomo Nogakutsuku■ Sumitomo Chemical ■ 〃 〃 〃 Weird person transformation■ Sumitomo Chemical Industries, Ltd. Tomoe Industrial Co., Ltd. Toyobo Co., Ltd. Polyplastic ■ East■ Daicel■ engineering plastic stocks Sumitomo Chemical ■ Clarastic MH NOFREN W-501 Sumi Rikisen F208-1 Smilit 5X-7G varnish bright Panlight L-1250W Sumipex B-LG del F-560 Duracon M 25-04 Amiran CM-3001G Sevian N Noril 731 Eno〈Tate D3011

Claims (1)

[Claims] 1. One or more thermoplastic resins (100 parts by weight of A and an oil absorption of 200 TIL/100 g or more,
and carbon black (B) having a surface area of 500 m2/f or more, consisting of 3 to 100 parts by weight, and having a volume resistivity of 1
1. A method for producing a plated product, which comprises directly electroplating a molded product made of a composition having a resistance of 0.03Ω·α or less after etching and neutralization. 2. The method for producing a plated product according to item 1 above, wherein the thermoplastic resin is a vinyl cyanide-aromatic vinyl-conjugated diene rubber copolymer. 3. The method for producing a plated product according to item 1 above, wherein the thermoplastic resin is a polypropylene resin or resin. 4. The method for producing a plated product according to item 1 above, wherein the thermoplastic resin is a polyethylene resin. 5. The method for producing a plated product according to item 1 above, wherein the thermoplastic resin is a vinyl chloride resin. 6. The method for producing a plated product according to item 1 above, wherein the thermoplastic resin is polystyrene resin. 7. The method for producing a plated product according to item 1 above, wherein the thermoplastic resin is a polycarbonate resin. 8. The method for producing a plated product according to item 1 above, wherein the thermoplastic resin is a methacrylic resin. 9. The method for producing a plated product according to item 1 above, wherein the thermoplastic resin is a polysulfone resin. 10 The first thermoplastic resin is a polyacetal resin.
Method for manufacturing plated products described in Section 1. 11 The first above, wherein the thermoplastic resin is a polyamide resin.
12. The method for producing a plated product according to item 1, wherein the thermoplastic resin is an aromatic vinyl-cyanide vinyl resin. Method of manufacturing the described plated products. 14. The method for producing a plated product according to item 1 above, wherein the thermoplastic resin is an ethylene-vinyl acetate resin. 15. The method for producing a plated product according to item 1, wherein the thermoplastic resin is a mixture of polyphenylene oxide resin and polystyrene resin. 16. The method for producing a plated product according to item 1, wherein the thermoplastic resin is a mixture of polypropylene resin and polyethylene resin. 17 The thermoplastic resin consists of a vinyl cyanide-aromatic vinyl-conjugated diene rubber copolymer, a vinyl chloride resin, a polycarbonate resin, a methacrylic resin, a polysulfone resin, a polyacetal resin, an aromatic vinyl-cyanide resin, and a polyphenylene oxide resin. 2. The method for producing a plated product according to item 1 above, wherein the resin is a mixture of one or more resins selected from the group. 18. The method for producing a plated product according to any of the above items 2 to 17, wherein the carbon black (B) is 5 to 70 parts by weight. 19. The method for producing a plated product according to item 18 above, which has a volume resistivity of 10 2 Ω·α or less.