| 摘要 |
PURPOSE: A method for producing an asymmetric microporous hollow fiber membrane is provided to have stronger mechanical strength and superior chemical resistance. CONSTITUTION: A method for producing an asymmetric microporous hollow fiber membrane comprises the following steps. Radiation liquid including polyvinylidene difluoride 8~25 weight, organic solvent 50~90 weight, inorganic salt 0.5~10 weight, poor solvent 1~10 weight, and hydrophilic polymer 1~10 weight is produced. The radiation liquid is discharged through a pipe shaped radiation nozzle of a double structure which simultaneously discharging the radiation liquid and internal coagulant. The discharged liquid becomes solid. The solidified hollow fiber membrane is washed and dried.
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