Fuel tank gasket and method for its manufacture

Details Fuel tank gasket and method for its manufacture Fuel tank gasket and method for its manufacture

C - Chemistry, Metallurgy

09

K

C09K 3/10 (2006.01) B64D 37/06 (2006.01) F16J 15/00 (2006.01)

Patent

CA 2241750

A fuel tank gasket (20) which before use consists essentially of a) 30-90 % by weight porous base material and b) 10-70 % by weight additive having the requirements that it is compatible with said porous material is taught. The porous base material of the gasket (20) is preferably expanded polytetrafluoroethylene and the additive is selected from the group consisting of perfluoropolyethers, polysiloxane, butadiene-acrylonitrile co-polymers, polyesters, polyethers as well as functionalised and fluorinated derivatives thereof. Preferably the additive is perfluoropolyether or a functionalised derivative thereof. A method for manufacture of the said fuel tank gasket comprising the following steps is furthermore described: a) a first step of manufacturing a porous base material (90), b) a second step of preparing an additive (70) in fluid phase, c) a third step of applying said additive (70) to said porous base material (90), d) a fourth step of drying the base fuel tank gasket (90). The fuel tank gasket (20) is used in transportation vehicles, such as an aircraft, for ensuring that fuel (7) does not leak out of the fuel tank (5) and water does not enter the fuel tank (5) and contaminate the fuel (7) therein.

On décrit un joint d'étanchéité (20) pour réservoir à carburant qui, avant l'utilisation, comprend essentiellement a) 30 à 90 % en poids d'un matériau de base poreux et b) 10 à 70 % en poids d'un additif remplissant les conditions requises de compatibilité avec le matériau poreux. Le matériau de base poreux du joint d'étanchéité (20) est, de préférence, un polytétrafluoroéthylène expansé et l'additif est sélectionné dans le groupe constitué par des perfluoropolyéthers, un polysiloxane, des copolymères d'acrylonitrile-butadiène, des polyesters, des polyéthers, ainsi que par des dérivés fonctionnalisés et fluorés de ces composés. L'additif est, de préférence, un perfluoropolyéther ou un dérivé fonctionnalisé de ce composé. On décrit aussi un procédé de fabrication du joint d'étanchéité pour réservoir à carburant consistant à a) fabriquer un matériau de base poreux (90); b) préparer un additif (70) en phase fluidique; c) appliquer cet additif (70) sur le matériau de base poreux (90); d) sécher le matériau de base poreux (90) du joint d'étanchéité. On utilise le joint d'étanchéité (20) pour réservoir à carburant dans des véhicules de transport, tels qu'un avion, pour empêcher des fuites de carburant (7) ou que de l'eau ne pénètre dans le réservoir (5) et y contamine le carburant (7).

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