纺膜参数对PVC中空纤维膜结构与性能的影响

Effects of spinning membrane parameters on the structure and properties of PVC-CA hollow fiber membrane

以聚氯乙烯(PVC)和醋酸纤维素(CA)为膜材料,采用非溶剂致相分离(NIPS)法,通过改变纺膜参数制备了PVC中空纤维膜.结果表明:所制得的中空纤维膜具有致密皮层,断面为海绵孔与指状孔共存结构,纯水通量可达314 L/(m^(2)·h),BSA截留率可达95.0%,断裂强度22 MPa.此外,细中空纤维膜可在0.6 MPa压力以下稳定运行,并可对自来水中的有机物深度脱除49.30%.

The PVC-CA hollow fiber membranes were prepared by the non-solvent-induced phase separation(NIPS)method using polyvinyl chloride(PVC)and cellulose acetate(CA)as membrane materials and by changing the spinning parameters.The characterization results showed that the hollow fiber membranes had a dense skin layer,a cross-sectional structure of sponge pores and finger pores,a pure water flux of 314 L/(m^(2)·h),a BSA retention rate of 95.0%,and a fracture strength of 22 MPa.In addition,the fine hollow fiber membranes could operate stably under 0.6 MPa pressure and could remove 49.30%of organic matter from tap water.