| 摘要 |
1510269 Making diaphragms ORONZIO DENORA IMPIANTI ELECTROCHIMICI SpA 3 Dec 1976 [3 Dec 1975] 50447/76 Heading C7B [Also in Division C3] Diaphragms for electrolytic cells are obtained by impregnating a porous support, e.g. asbestos or PTFE sheet or cloth, with a solution in a polar solvent of a normally insoluble polymer which has been rendered soluble by reaction with an alkylene oxide, and then re-converting the polymer to insoluble form by hydrolysis. In Examples, the starting polymer is either sulphonated tetrafluoroethylene/acrylic acid copolymer or a styrene/ divinyl benzene copolymer containing primary amine groups, and in each case the polymer is reacted with ethylene oxide, the product dissolved in water and used to impregnate asbestos sheet, and the product then hydrolysed with water vapour/ammonia. The resulting diaphragms are used in electrolysis of brine. |
