Method for preparing asbestos-free chlor-alkali diaphragm

Details Method for preparing asbestos-free chlor-alkali diaphragm Method for preparing asbestos-free chlor-alkali diaphragm

1997-01-09

1997-11-04

Gorgos, Kathryn L.

Coating processes

Foraminous product produced

427247, B05D 500

Patent

active

056837496

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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