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Title:
METHOD FOR MANUFACTURING ASYMMETRIC POLYVINLYLIDENEFLUORIDE HOLLOW FIBER MEMBRANE AND HOLLOW FIBER MEMBRANE MANUFACTURED THEREFROM
Document Type and Number:
WIPO Patent Application WO/2014/196689
Kind Code:
A1
Abstract:
The present invention relates to a method for manufacturing an asymmetric polyvinlylidenefluoride (PVDF) hollow fiber membrane, which enables effective mixing of PVDF and a diluent without using separate inorganic fine powder, such as silica; in which a PVDF hollow fiber membrane is manufactured using a thermally induced phase separation method having an advantage of allowing easy obtaining of a separation membrane of consistent quality due to a key factor in controlling the phase separation in the two-substance mixture system of the polymer and the diluent being temperature, which is a manufacturing variable that is relatively simple and easy to control; in which a technique is applied for producing a temperature difference between the outer and the inner surfaces of a PVDF hollow fiber, and therefore, finally an asymmetric structure is expressed in which the inner surface side and the outer surface side of the PVDF hollow fiber have mutually different pore sizes and distributions; and which, even when an extraction process and a drawing process are applied, achieves a higher tensile strength and a larger average pore size, and thus higher porosity and water permeability than conventional hollow fiber membranes, since inorganic fine powder is not included.

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Inventors:
PARK MIN-SOO (KR)
KIM JIN-HO (KR)
Application Number:
PCT/KR2013/007250
Publication Date:
December 11, 2014
Filing Date:
August 12, 2013
Export Citation:
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Assignee:
ECONITY CO LTD (KR)
International Classes:
B01D71/34; B01D69/08; B29C48/05; B29C48/10; D01D5/24; D01F1/08
Foreign References:
KR950002826B11995-03-27
US20070045175A12007-03-01
US5489406A1996-02-06
KR20100007245A2010-01-22
KR101077954B12011-10-28
Attorney, Agent or Firm:
PHIL & ONZI INT'L PATENT & LAW FIRM (KR)
특허법인 필앤온지 (KR)
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