Method for preparing asbestos-free chlor-alkali diaphragm
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United States of America Patent
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Nov 4, 1997
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N/A
app pub date -
Jan 9, 1997
filing date -
Jul 26, 1995
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Abstract
A method for preparing asbestos-free diaphragms for chlor-alkali electrolytic cells is described. The comprises establishing a liquid permeable diaphragm base mat of fibrous synthetic polymeric material and ion-exchange material on the cathode structure, treating the base mat with strongly alkaline aqueous alkali metal hydroxide having a concentration of from about 15 to about 40 weight percent, and providing a coating of inorganic particulate material on the base mat before the base mat has dried. Preferably, the base mat is coated with the inorganic particulate material using a slurry of the inorganic particulate material suspended in the strongly alkaline aqueous alkali metal hydroxide.
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