| 摘要 |
<p>The pipe structure is new. Multilayer polyamide-based pipe comprises, in the radial direction from its interior towards exterior: (a) internal layer composed of polyamide or mixture of polyamide and polyolefin on polyamide matrix, and containing dispersed charge of electroconductive carbon black producing surface resistance below 10<6> Ohm; (b) intermediate layer composed of polyamide or mixture of polyamide and polyolefin on polyamide matrix, containing no electroconductive carbon black (or only electrically non-significant amount of carbon black); (c) a layer of binder; and (d) external layer of polyamide, with all layers adhering to each other along their contact zones. The pipe may also contain supplementary layer of polymer containing ethylene and vinyl alcohol groups (EVOH), positioned between external polyamide layer and intermediate layer.</p> |
