Verfahren zur Herstellung eines Treibstoffschlauchs und dadurch hergestellter Treibstoffschlauch

摘要

A method of producing a fuel hose having superior adhesive reliability with superior initial adhesive strength between a tubular fluororesin inner layer (1) and a thermoplastic resin outer layer (2) and with restrained deterioration in adhesive strength after heat aging and immersion into fuel under severe conditions such as an inside of an engine compartment. The method includes plasma treatment on a peripheral surface of the tubular fluororesin inner layer, at least one treatment of water treatment and silane coupling agent treatment on the plasma-treated surface and formation of the thermoplastic resin outer layer on the treated peripheral surface. Thus, the functional groups having fluorine atoms not involved in adhesion go inside the tubular fluororesin inner layer by conducting the at least one treatment of water treatment and silane coupling agent aqueous solution treatment so that the surface concentration of fluorine atoms sufficiently decreases on the peripheral surface of the tubular fluororesin inner layer and adhesive functional groups (functional groups having oxygen atoms) such as an OH group are widely distributed therein. As a result, adhesive strength between the tubular fluororesin inner layer and the thermoplastic resin outer layer is improved so that deterioration in adhesive strength after heat aging and immersion into fuel can be restrained under severe conditions such as an inside of an engine compartment, for obtaining a fuel hose superior in adhesive reliability.