Title:
HIGH-DEGASSING POLYOLEFIN HOLLOW FIBER MEMBRANE, PREPARATION METHOD THEREFOR, AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO/2024/012122
Kind Code:
A1
Abstract:
A high-degassing polyolefin hollow fiber membrane, a preparation method therefor, and the use thereof in removing oxygen in ultrapure water. The polyolefin hollow fiber membrane comprises a main body, one side of the main body being an inner surface facing an inner cavity and the other side of same being an outer surface. Non-directional zigzag paths are formed in the main body, the outer surface is a dense surface, and the area ratio of gas pores in the inner surface is 10%-30%. The hollow fiber membrane has an average thickness of 45-65 μm and a ratio of the average outer diameter to the average inner diameter of 1.45-1.55. The hollow fiber membrane has a TOC dissolution amount of not more than 3 μg/L and the deoxidation efficiency of greater than 80%. The preparation method comprises the following steps: S1, spinning; S2, pre-crystallization; S3, air-cooling crystallization; S4, shaping by annealing; S5, pore forming by two-time cold drawing; S6, pore expansion by hot drawing; and S7, heat shaping.
Inventors:
JIA JIANDONG (CN)
CHEN MENGZE (CN)
CHEN MENGZE (CN)
Application Number:
PCT/CN2023/099655
Publication Date:
January 18, 2024
Filing Date:
June 12, 2023
Export Citation:
Assignee:
HANGZHOU COBETTER FILTRATION EQUIPMENT CO LTD (CN)
International Classes:
B01D69/08; B01D19/00; B01D53/22; B01D67/00; B01D71/26
Foreign References:
| CN115155330A | 2022-10-11 | |||
| CN116688775A | 2023-09-05 | |||
| CN111888946A | 2020-11-06 | |||
| CN113274889A | 2021-08-20 | |||
| CN107596925A | 2018-01-19 | |||
| CN113694745A | 2021-11-26 | |||
| CN113209835A | 2021-08-06 | |||
| CN1336848A | 2002-02-20 | |||
| US20100151310A1 | 2010-06-17 |
Attorney, Agent or Firm:
HANGZHOU CHUANGZHIZHUOYING INTELLECTUAL PROPERTY AGENCY (GENERAL PARTNERSHIP) (CN)
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