METHOD FOR MANUFACTURING ASYMMETRIC POLYVINLYLIDENEFLUORIDE HOLLOW FIBER MEMBRANE AND HOLLOW FIBER MEMBRANE MANUFACTURED THEREFROM
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United States of America Patent
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Apr 28, 2016
app pub date -
Aug 12, 2013
filing date -
Jun 4, 2013
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The present disclosure relates to a method for manufacturing an asymmetric polyvinlylidene fluoride (PVDF) hollow fiber membrane, whereby a PVDF hollow fiber membrane is manufactured by the thermally induced phase separation method, which enables effective mixing of the PVDF and a diluent without additional use of an inorganic fine powder such as silica and is advantageous in that it is relatively easy to control preparation parameters because temperature is the main factor of phase separation of the two-component system of the polymer and the diluent and thus to obtain a separation membrane of satisfactory quality, by providing temperature difference between the inner and outer surfaces of a hollow fiber, thereby achieving an asymmetric structure in which the inner surface side and the outer surface side of the hollow fiber have different pore sizes and distributions.
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