Chlorotrifluoroethylene containing polymer diaphragm

Details Chlorotrifluoroethylene containing polymer diaphragm Chlorotrifluoroethylene containing polymer diaphragm

C - Chemistry, Metallurgy

25

B

204/201

C25B 13/08 (2006.01)

Patent

CA 1131175

ABSTRACT OF THE DISCLOSURE Fibers about micron size in cross-section of certain fluorine-containing polymers can be treated after being deposited as a diaphragm, either during operation or separately before installation, so that they develop a 0.25-millimeter- thick ply on either side of a central body which is substan- tially different in chemical composition. This yields a diaphragm 1 to 5 millimeters thick which has a Mullen burst strength approximately three to five times greater than that of an untreated diaphragm (20-25 pounds per square inch versus 5 to 7 pounds per square inch) and a remarkably improved service life in the treated diaphragm (200 days and up) in comparison with such untreated diaphragm (30 days or less). A polymer based upon a major proportion of chlorotri- fluoroethylene can be used. This discovery is economically significant, in that it is an essential element in the technology of the replacement of asbestos diaphragms now used with a synthetic material. Health-hazard and pollution-control considerations have made it desirable to replace asbestos, and this invention provides the key to the solution of the problem. Moreover, a synthetic-polymer diaphragm has two significant advantages that an asbestos one lacks it will withstand washing or cleaning with an acid solution, and it does not swell in service and resists erosion, so that a closer electrode spacing can be used and the cell voltage can thus be lower.

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