| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for production of a porous hollow fiber membrane capable of preventing breakage thereof due to a high-flow rate gas or a fluid such as a liquid, or breakage due to fatigue by enabling improvement of the withstand load property and fatigue resistance of a porous hollow fiber membrane module.SOLUTION: A method for production of a fiber-reinforced porous hollow fiber membrane comprises: making a cylindrical braid pass through the inside nozzle of a double annular spinning nozzle; applying a membrane-making stock solution discharged from the outside nozzle of the double annular spinning nozzle onto the outer surface of the cylindrical braid passed through the inside nozzle of the double annular spinning nozzle; coagulating in a coagulant liquid after impregnation; and drying. A solution in which polyvinylidene fluoride fuses in triethyl phosphate in a concentration of 16-27 wt.% is used as the membrane-making stock solution. A hollow fiber-like material obtained after spinning is coagulated in the coagulant liquid comprising an aqueous solution of triethyl phosphate having a concentration of 10-90 wt.% for 40 to 120 sec. |
