| 摘要 |
<p>1,146,376. Coating insulating elements with metals. DYNAMIT NOBEL A.G. Feb.3, 1967 [Feb. 5, 1966], No. 5438/67. Headings C7B and C7F. A metal-coated shaped element is produced by (a) forming the desired shape from an electrically insulating composition comprising a thermoplastic and from 10 to 60% by weight of an inorganic fibrous material, (b) chemically reducing a metal salt solution in the presence of the element to coat it with metal, and (c) applying metal thereover by electro-plating. The thermoplastic may be PVC, after-chlorinated PVC, polyolefine, polyamide, polystyrene, polyester, polycarbonate, polyphenylene oxide, or ABS copolymer or mixtures of two or more polymers selected from polyacrylonitrile, polybutadiene and polystyrene; while the inorganic fibres may be asbestos, glass fibres or mineral wool. Examples are given for PVC, polypropylene for PVC, with tricresyl phosphate and epoxidized soya oil with asbestos or glass fibres. The initial metal coating may be of a Cu-Ni alloy, Cu, Ni or Ag and the electro-plated metal may be Cu, Ag, Au, Ni, Cr. In a specific metallizing procedure, the element is degreased in sodium hydroxide, neutralized with sodium bisulphite, chemically roughened in potassium dichromate in sulphuric acid, sensitized with SnCl 2 , activated with PdCl 2 , chemically plated with Cu-Ni and finally electroplated with Cu.</p> |
