| 摘要 |
PURPOSE:To obtain a cation exchange membrane by which low hydrogen overvoltage is obtained when used for electrolysis of water by forming a porous layer on the surface of an ion exchange membrane consisting of fluorine-contg. polymers contg. sulfonic acid groups and carboxylic acid groups. CONSTITUTION:A cation exchange membrane is formed of a fluorine-contg. polymer having sulfonic acid groups and a fluorine-contg. polymer having ion exchange groups which are more weakly acidic than sulfonic acid groups such as carboxylic acid groups, sulfonic acid groups, and phosphonic acid groups, etc. and is obtained by blending, lamination, substitution of acid groups on one side, et. The porous layer is formed by binding particles of a conductive or non-conductive inorg. material such as Si or an org. material such as fluororesin to form a gas and liquid permeable film on the surface of a membrane at 0.001- 100mg/cm<2> followed by press sticking under heating. The ion exchange membrane formed with such porous layer on at least one surface thereof lends itself to electrolysis of aq. solns. of acids, alkalis, alkali halide, alkali carbonate, etc. other than water.
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