METHOD FOR PRODUCING FIBER-REINFORCED POLY(VINYLIDENE FLUORIDE) POROUS HOLLOW FIBER MEMBRANE

摘要

SOLUTION: In a method for producing a fiber-reinforced porous hollow fiber membrane, the fiber-reinforced porous hollow fiber membrane is produced by: passing a cylindrical braid through the inside of an inner nozzle of a double annular spinning nozzle; applying a membrane-forming stock solution discharged from an outer nozzle of the double annular spinning nozzle to the outside surface of the cylindrical braid passed through the inner nozzle of the double annular spinning nozzle, and impregnating the cylindrical braid with the membrane-forming stock solution; and then solidifying the membrane-forming stock solution in a solidifying liquid and drying it. In the method, as the membrane-forming stock solution, there is used a solution in which poly(vinylidene fluoride) obtained by an emulsion polymerization method is dissolved in triethyl phosphate in a concentration of 15-30 wt.%. A hollow fiber material obtained after spinning is solidified for 40-120 seconds in the solidifying liquid formed of an aqueous solution of triethyl phosphate in a concentration of 10-90 wt.%.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2018,JPO&INPIT