Electrolysis diaphragm fabric prodn. - by radiochemically grafting monomer on fluorocarbon! polymer substrate

摘要

A diaphragm fabric for electrolysis diaphragm is produced by radiochemically grafting a monomer on a fluorocarbon polymer substrate, by placing the latter under vacuo and irradiating it with ionising radiation, then allowing it to stand in air, contacting it with a reaction mixt. contg. the monomer and heating the assembly to cause grafting. The diaphragm keeps its characteristics for much longer periods of time than prior art diaphragms, partic. in KOH at 200 deg.C. For example, the ionic resistance increases 15 times more than that of another diaphragm with the same degree of grafting obtd. by another method and placed uder the same operating conditions, after a given period of time.