| 摘要 |
The present invention relates to a multilayer tube comprising, in succession in its radial direction from the outside inwards: a nylon-11 or nylon-12 polyamide outer layer (1); a tie layer (2); an optional EVOH layer (3); an optional layer (4) made of PA-6 or a PA-6/polyolefin blend having a PA-6 matrix and polyolefin dispersed phase; an inner layer (5) based on PA-6 in contact with the transported fluid, comprising by weight, the total being 100%: 40 to 65% (advantageously 45 to 60%) of PA-6, 1 to 20% (advantageously 5 to 15%) of HDPE, 10 to 30% (advantageously 15 to 25%) of at least one polymer P1 chosen from impact modifiers and polyethylenes, either or both of the HDPE and the P1 being completely or partly functionalized and 5 to 30% (advantageously 15 to 30% and preferably 17 to 24%) of an electrically conductive material. The tube of the present invention has a very low permeability to petrol, particularly to hydrocarbons and to their additives, in particular alcohols such as methanol and ethanol or else ethers such as MTBE or ETBE. These tubes also have a very good resistance to fuels and lubricating oils for engines. This tube has very good mechanical properties at low temperature or at high temperature. The invention also relates to the use of these tubes for transporting petrol.
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