| 摘要 |
The present invention relates to a multilayer hose for compressed air, comprising: an inner layer in contact with the compressed air, chosen from polyamides, polyamide/polyolefin blends with a polyamide matrix, copolymers having polyamide blocks and polyether blocks, and blends of polyamides with copolymers having polyamide blocks and polyether blocks; an outer layer made of polyamide chosen from PA-11, PA-12, aliphatic polyamides resulting from the condensation of an aliphatic diamine having from 6 to 12 carbon atoms and of an aliphatic diacid having from 9 to 12 carbon atoms, and 11/12 copolyamides either having more than 90% nylon-11 units or more than 90% nylon-12 units. According to a second embodiment, the invention relates to a mutilayer hose for compressed air, comprising: an inner layer in contact with the compressed air, made of polyamide chosen from PA-11, PA-12, aliphatic polyamides resulting from the condensation of an aliphatic diamine having from 6 to 12 carbon atoms and of an aliphatic diacid having from 9 to 12 carbon atoms, and 11/12 copolyamides having either more than 90% nylon-11 units or more than 90% nylon-12 units; an outer layer made of polyamide which is chosen from the same products as the inner layer and which may be the same or different; at least one interlayer placed between the inner layer and the outer layer chosen from polyamide/polyolefin blends with a polyamide matrix, copolymers having polyamide blocks and polyether blocks, and blends of polyamides with copolymers having polyamide blocks and polyether blocks. According to a variant of the invention, a reinforcing braid is placed between the inner layer and the outer layer. According to another variant of the invention, at least one tie layer is placed between the inner layer and the interlayer and/or between the interlayer and the outer layer.
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