公开(公告)号：US20210268449A1

公开(公告)日：2021-09-02

申请号：US17253225

申请日：2019-06-20

Applicant: NOK CORPORATION

Inventor： Takayuki TAKAGI ,  Tsuyoshi EMOTO

IPC: B01D69/08 ,  B01D71/68 ,  B01D71/44 ,  H01M8/04119

Abstract: A method for producing a porous hollow fiber membrane for humidification, the method comprising dry-wet spinning a spinning dope comprising a water-soluble organic solvent solution composed of polyphenylsulfone resin and hydrophilic polyvinylpyrrolidone using water as a core liquid; then performing a crosslinking treatment at 120 to 220° C. for 1 to 20 hours; and then dipping the resultant in an acidic solution with a concentration of 5 to 500 ppm. The obtained porous hollow fiber membrane has improved hydrophilicity without impairing the wettability of the porous hollow fiber membrane. Since, humidification performance of the porous hollow fiber membrane alone can be improved, it is effective as a humidifying membrane for fuel cells.