Method of preparing reinforced asbestos diaphragms for chlorine-

Details Method of preparing reinforced asbestos diaphragms for chlorine- Method of preparing reinforced asbestos diaphragms for chlorine-

1980-10-14

1982-07-27

Chin, Peter

Paper making and fiber liberation

Processes and products

Including solid non-waterlaid preform

162106, 162155, 162169, 162183, 204295, C25B 1300

Patent

active

043415962

ABSTRACT:
A resin modified asbestos diaphragm is prepared by diluting a heat curable polyvinylidene fluoride homopolymer resin latex containing no more than about 5% resin solids with an aqueous solution containing about 4% to 5% sodium hydroxide. From about 6 to about 11 parts of asbestos fibers are then slowly added to this alkaline resin latex solution for each part of resin solids contained therein with agitation to produce a clear aqueous slurry of resin coated asbestos fibers. To this slurry is then added an aqueous solution of 10% to 15% sodium hydroxide to swell the asbestos fibers. The resulting slurry is deposited on a screen to form a diaphragm which is carefully dried and cured at elevated temperatures to complete the polymerization of the polyvinylidene fluoride resin and form a bonded resin coated asbestos fiber product that is dimensionally stable. Such resin modified asbestos diaphragms may be used in electrolytic cells for electrolyzing alkali metal halide solutions.

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