Process for preparing ion-exchange membranes

Details Process for preparing ion-exchange membranes Process for preparing ion-exchange membranes

1983-10-03

1985-10-15

Lawrence, Evan K.

Coating processes

With post-treatment of coating or coating material

Heating or drying

204296, 4273936, 4274301, B05D 302, B05D 702

Patent

active

045474117

ABSTRACT:
A process for preparing membranes for electrolysis. One such process comprises impregnating a porous sheet comprising a polyfluoroolefin, asbestos fibers and an inorganic pore-forming agent with a solution comprising (i) a compound selected from the group consisting of acrylic acid and methacrylic and (ii) at least one other non-ionic monomer having at least one >C.dbd.CH.sub.2 group, withdrawing said sheet from contact with said solution, polymerizing the monomers which become impregnated in the sheet so that the pores of the sheet contain the resulting acrylic polymer, eliminating the inorganic pore-forming agent to form pores in the sheet, and swelling the acrylic polymer so that the pores of the sheet are closed by the polymer. The membranes produced by these processes are useful in cells for the electrolysis of sodium chloride to produce chlorine and sodium hydroxide.

REFERENCES:
patent: 3694281 (1972-09-01), Leduc
patent: 3980613 (1976-09-01), Bachot et al.
patent: 4031041 (1977-06-01), Bouy et al.
patent: 4056655 (1977-11-01), Faille et al.
patent: 4101395 (1978-07-01), Montani et al.
patent: 4178218 (1979-12-01), Seko

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