Thermoplastic fuel tank having reduced fuel vapor emissions

Details Thermoplastic fuel tank having reduced fuel vapor emissions Thermoplastic fuel tank having reduced fuel vapor emissions

C - Chemistry, Metallurgy

08

L

C08L 101/12 (2006.01) B60K 15/03 (2006.01) C08L 101/00 (2006.01) C08L 5/16 (2006.01)

Patent

CA 2246766

The invention can comprise a thermoplastic fuel tank or container having a vapor barrier comprising a cyclodextrin composition. A modified cyclodextrin that is chemically modified with substituents that increase the compatibility of the cyclodextrin material in the fuel container material can be used. The improved fuel container obtains substantial barrier properties from the interaction between the cyclodextrin material in the fuel container materials with the fuel vapor permeant material. The cyclodextrin in the fuel tank walls complexes or entraps fuel vapor that permeates through the materials making up the tank and are held within the tank material preventing the permeant fuel vapor from passing through the tank into the environment. The fuel vapor permeant can comprise a variety of well known materials including aliphatic and aromatic hydrocarbons, oxygenates such as tertiary butyl methyl ether, ethanol, methanol, and other combustible liquid fuel materials.

Réservoir ou cuve à carburant thermoplastique comportant un écran de vapeurs renfermant une composition de cyclodextrine. On peut utiliser une cyclodextrine modifiée chimiquement par des substituents qui renforcent sa compatibilité dans le matériau constitutif du récipient de carburant. Ce récipient amélioré présente des propriétés écran appréciables par l'interaction entre la cyclodextrine renfermée dans des matériaux qui le constituent et les matières perméantes de vapeurs de carburant. La cyclodextrine dans les parois du réservoir de carburant complexe ou piège les vapeurs de carburant qui tendent à passer à travers les matériaux constitutifs du réservoir et qui sont ainsi retenues dans ce matériau et ne peuvent donc le traverser pour être libérees à l'extérieur. Les matières perméantes se présentant sous forme de vapeurs de carburant recouvrent des matières connues et très diverses comme les hydrocarbures alyphatiques et aromatiques, des produits oxygénés comme le butyl-méthyl-éther tertiaire, l'éthanol, le méthanol et d'autres carburants liquides combustibles.

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