Porous membranes and methods of manufacturing these membranes

Abstract

Abstract 849,837. Coated metallic fabrics. COMMISSARIAT A L'ENERGIE ATOMIQUE. May 16, 1957 [May 22, 1956], No. 15669/57. Class 140. A porous membrane constituted by a corrosion-resisting metallic fabric and a porous layer of a fluorohydrocarbon polymer, chlorofluorohydrocarbon polymer or a halogenated hydrocarbon grease or wax, embedding said fabric is produced by forming an emulsion of at least one of the polymers, grease or wax, treating the emulsion with a coagulant to flocculate it into a moist paste, coating the metallic fabric with said paste, fixing said layer and eliminating the coagulant therefrom. The layer may be fixed by passage between the rollers of a rolling- machine, and then dried in air to eliminate the coagulant. After drying the coated fabric may be heated at a temperature averaging 300‹ C. for several hours, cooled, washed with alcohol and again passed through a rolling-machine and dried in air. The coating may contain polytetrafluoroethylene or polytrifluoromonochloro ethylene, and also corrosion-resisting powders preferably selected from nickel, calcium fluoride and titanium dioxide which are added to the emulsion. A non-ionic wetting-substance, e.g. an alkylaryl polyether alcohol or a polyethylene glycol ether of an alkylated phenol, may also be added to the emulsion. The corrosion-resistant metallic fabric may be of nickel, silver, or a metal coated with nickel or silver. The coagulant may be selected from methyl, ethyl, isopropyl, butyl, isobutyl, and isoamyl alcohols, cyclohexanol, acetone and acetic acid.

Inventors

• 👤 Plurien Pierre
• 👤 Parisot Jean

Bibliographic Details