Aromatic polyamide tubing for vehicle applications

F - Mech Eng,Light,Heat,Weapons – 16 – L

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F16L 11/04 (2006.01) B32B 1/08 (2006.01) B32B 27/34 (2006.01)

Patent

CA 2554672

A vehicle tube (14) includes a layer of aromatic polyamide (22). In one example, an outer layer of aromatic polyamide (24) is bonded to the layer aromatic polyamide (22). In another example, the layer of aromatic polyamide (22) includes filler and modifying agents (34) and is electrically conductive. Example filler and modifying agents (34) include carbon powder, carbon nanotubes, metal fiber, heat-stabilizing agent, impact-modifying agent or mixtures thereof. In another example, the outer layer of aromatic polyamide (24) includes a corrugated outer surface portion (70) to provide flexibility to the tube (14). One example method includes extruding an aromatic polyamide barrier layer (22), extruding a second aromatic polyamide barrier layer (24) coaxially with the first aromatic polyamide layer (22), and bonding the second aromatic polyamide barrier layer (24) to the first aromatic polyamide barrier layer (22).

Selon cette invention, un tuyau pour véhicule (14) comprend une couche de polyamide aromatique (22). Dans un exemple, une couche externe de polyamide aromatique (24) est liée à la couche de polyamide aromatique (22). Dans un autre exemple, ladite couche de polyamide aromatique (22) contient une charge et des modificateurs (34) et elle est conductrice d'électricité. Un exemple de charge et de modificateurs (34) englobent la poudre de carbone, des nanotubes de carbone, des fibres métalliques, un agent de stabilisation thermique, un agent de modification d'impact ou des mélanges correspondants. Dans un autre exemple, la couche externe de polyamide aromatique (24) comprend une partie de surface externe ondulée (70) de manière à fournir une certaine flexibilité au tuyau (14). Un exemple de procédé consiste à extruder une couche barrière de polyamide aromatique (22), une seconde couche barrière de polyamide aromatique (24) coaxialement à ladite première couche de polyamide aromatique (22), et à lier la seconde couche barrière de polyamide aromatique (24) avec la première couche barrière de polyamide aromatique (22).

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