Hollow fiber membrane and method of preparing the same
AssigneeLotte Chemical Corporation
InventorsDong Jun Im, Bum Jin Park, Chang Min Seo
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Abstract
A hollow fiber membrane and a method of preparing the same. The hollow fiber membrane has an inner surface and an outer surface, wherein the inner surface has a zebra-stripe pattern in which a dense portion and a porous portion are alternately formed in a longitudinal direction of the hollow fiber membrane.
Claims16
A hollow fiber membrane having an inner surface and an outer surface, wherein the inner surface has a zebra-stripe pattern in which a dense portion and a porous portion are alternately formed in a longitudinal direction of the hollow fiber membrane.
A method of preparing a hollow fiber membrane, comprising:
- preparing a spinning solution using a composition comprising a vinylidene fluoride polymer resin and a first plasticizer having a viscosity of about 300 cP to about 4,000 cP;
- forming a pre-hollow fiber membrane by bringing the spinning solution into contact with a second plasticizer having a viscosity of about 300 cP to about 4,000 cP in a dual-concentric nozzle, and spraying and coagulating the spinning solution;
- extracting the first and second plasticizers from the pre-hollow fiber membrane;
- heat treating the pre-hollow fiber membrane;
- and
- stretching the pre-hollow fiber membrane subjected to heat treatment.
Dependencies are inferred from the claim text.