Title:
PREPARATION METHOD OF SUSTAINABLE HYDROPHILIC MODIFIED POLYVINYLIDENE FLUORIDE HOLLOW MEMBRANE
Document Type and Number:
WIPO Patent Application WO/2021/258701
Kind Code:
A1
Abstract:
The present invention discloses a preparation method of a sustainable hydrophilic modified polyvinylidene fluoride hollow membrane, comprising the following steps: (1) a core solution and a polyvinylidene fluoride casting solution are co-extruded from an annular spinneret of a hollow fiber spinning apparatus to obtain nascent membrane filaments, wherein the core solution is formed by reacting ammonium persulfate, polyvinylpyrrolidone and RO water; (2) at 40-50ºC, the nascent membrane filaments obtained in step (1) are spun by means of a dry-wet spinning process to form a hollow fiber membrane, wherein a coagulating bath is water or a mixture of water and a solvent, and by controlling the flow rate of the core solution, and the temperature and composition of the coagulating bath a hollow fiber membrane with different internal and external structures can be obtained; and (3) a membrane filament moisturizing process: the hollow fiber membrane obtained in step (2) is immersed in pure water at 15-40ºC for at least 48 hours, and is then placed in a mixed solution of water and glycerin and immersed for at least 12 hours, followed by drying to obtain the sustainable hydrophilic modified polyvinylidene fluoride hollow membrane.
Inventors:
CHEN HUIYING (CN)
HONG YUBIN (CN)
FANG FULIN (CN)
LAN WEIGUANG (CN)
HONG YUBIN (CN)
FANG FULIN (CN)
LAN WEIGUANG (CN)
Application Number:
PCT/CN2020/141177
Publication Date:
December 30, 2021
Filing Date:
December 30, 2020
Export Citation:
Assignee:
SUNTAR MEMBRANE TECHNOLOGY XIAMEN CO LTD (CN)
International Classes:
B01D69/08; B01D71/34
Foreign References:
| CN102430352A | 2012-05-02 | |||
| CN103182256A | 2013-07-03 | |||
| CN108479432A | 2018-09-04 | |||
| CN1159770A | 1997-09-17 | |||
| US4618533A | 1986-10-21 |
Attorney, Agent or Firm:
SHOUCHUANG JUNHE PATENT AGENT CO., LTD.XIAMEN (CN)
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