纺丝参数对PVC/PVB中空纤维膜性能的影响

摘要

Polyvinyl chloride（PVC）-polyvinyl butyral（PVB） hollow fiber membrane was prepared by phase-inversion technique.The spinning parameters,such as different compositions of coagulation bath,speeds of bore fluid,speeds of winding and air gaps,were examined to investigate their effects on the performance of the membrane.The results demonstrated that different surface structures of hollow fiber membrane could be obtained by adjusting the solvent content in the coagulation bath.The inner diameter and wall thicknesse of membrane changed as the speed of bore fluid and winding changed.The water flux and the BSA rejection rate were controlled by adjusting the air gap.Hence,different properties of PVC/PVB hollow fiber membranes could be prepared by controlling the spinning parameters.%采用干-湿相转化法制备聚氯乙烯（PVC）/聚乙烯醇缩丁醛（PVB）中空纤维膜。考察了凝固浴组成、芯液流速、卷绕速度、入水距离等纺丝参数对中空纤维膜性能的影响。结果表明,通过外凝固浴中溶剂含量的改变,可以控制中空纤维膜的皮层结构;通过芯液流速和卷绕速度的改变,可以控制内径和壁厚;通过入水距离的改变,控制水通量和截留率。因此通过控制纺丝参数,可制备性能不同的PVC/PVB中空纤维膜。