METHOD OF PRODUCTION A TUBULAR FILTERING ELEMENT WITH A FLUOROPLAST MEMBRANE Russian patent published in 2018 - IPC B01D71/32 B01D63/06 B01D67/00 B01D69/04 

FIELD: technological processes.

SUBSTANCE: invention relates to the filtration field. Method for producing a tubular filter element with a fluoroplastic membrane comprises dissolving the fluoroplastic in a volatile solvent, mixing the resulting solution with a blowing agent to form a working solution, applying it to the inner surface of the open-celled tube, evaporation of the solvent, leading to hardening of the fluoropolymer to form a semi-permeable membrane. Working solution contains, as the blowing agent, a liquid, highly volatile limiting hydrocarbon, as a fluoroplastic, a copolymer of trifluoroethylene with vinylidene fluoride, as solvent – acetone with the following ratio of components, mass%: a copolymer of trifluoroethylene with vinylidene fluoride 15–25, hydrocarbon 8–30, polyethylene glycol 0–20, acetone – the rest. Evaporation of a mixture of acetone with a hydrocarbon is carried out by blowing.

EFFECT: obtainment of stable concentrated solutions of the copolymer, which provides more favorable conditions for manufacturing and improving the quality of the filter elements.

1 cl, 1 tbl, 17 ex