METHOD FOR PRODUCING ASYMMETRIC POROUS MEMBRANE

    公开(公告)号:EP4309771A1

    公开(公告)日:2024-01-24

    申请号:EP23186024.8

    申请日:2023-07-18

    申请人: Hantech Co., Ltd.

    IPC分类号: B01D67/00 B01D71/68

    摘要: A method for producing an asymmetric porous membrane includes: forming a first casting film from a casting solution on a carrier, the casting solution containing a hydrophobic polymer, a hydrophilic polymer, a water-soluble polymer, and a solvent; placing the first casting film in an environment containing water vapor to contact the first casting layer with the water vapor, thereby obtaining a second casting film, the environment having a temperature ranging from 20°C to 33°C and a relative humidity of 30% to 80%; and contacting the second casting film with a coagulating agent so as to perform a wet-phase inversion. The hydrophilic polymer is polyvinylpyrrolidone, polyalkylene glycol, or a combination thereof. The water-soluble polymer is a copolymer of vinylpyrrolidone and vinyl acetate, a copolymer of vinylpyrrolidone and alkylene glycol, a vinyl alcohol-based polymer, an ethylene glycol/propylene glycol based copolymer, an ethyleneimine-based polymer, a water-soluble cellulose, or combinations thereof.