METHOD FOR BONDING CATION EXCHANGE MEMBRANE

摘要

PURPOSE:To strongly bond a non-conductive fluorocarbon film to a bonding part or a repairing part under heating and pressure, by using a laminate consisting of a specific fluorine-containing resin layer and a water impermeable fluorine-containing resin porous layer as the bonding member of a cation exchange membrane for an electrolytic diaphragm. CONSTITUTION:A laminate consisting of a layer composed of a fluorine- containing resin containing a carboxylic acid group and/or a sulfonic acid group or a functional group convertible to said group and a water impermeable fluorine-containing resin porous layer is used as the bonding member of a cation exchange membrane composed of a fluorine-containing resin containing a carboxylic acid group and/or a sulfonic acid group or a functional group convertible to said group. For example, a part of the fluorine-containing resin ion exchange membrane is laminated to a perforated sheet having pores obtained by the high speed stretching of polytetrafluoroethylene to be allowed to flow in the pores of the polytetrafluoroethylene sheet and mechanical anchor effect is allowed to generate to obtain a laminated porous membrane having sufficient interface bonding strength.