| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyvinylidene fluoride based composite hollow fiber membrane enlarging an effective film area by forming recession/projection on the outer surface of the film not depending on a size enlargement method for the hollow fiber membrane using a specific shape-different nozzle, and its manufacturing method. SOLUTION: In the composite hollow fiber membrane for forming an outer layer of a three-dimensional network structure including a macro-void and the inner layer of a spherical structure, a polyvinylidene fluoride based composite hollow fiber membrane has a wave-shape wrinkle on a surface of the hollow fiber membrane. In the manufacturing method for the polyvinylidene fluoride based composite hollow fiber membrane is manufactured via the step of extruding a resin solution A from the intermediate slit of a triple tubular spinning nozzle, a resin solution B from the outer layer slit of the nozzle and a coagulation liquid from a central pipe in a concentric circle form and cooling/solidifying the external coagulation liquid and the step of removing a solvent. In the manufacturing method for the polyvinylidene fluoride based composite hollow fiber membrane, the external coagulation liquid contains 70 wt.% or more of a non-solvent relative to the resin solution B. COPYRIGHT: (C)2009,JPO&INPIT
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