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采用干-湿相转化法研究了聚偏氟乙烯(PVDF)中空纤维超滤膜的制备。选用PVDF为膜材料,N,N-二甲基乙酰胺(DMAc)为溶剂,聚乙烯吡咯烷酮(PVP)和聚乙二醇(PEG)为添加剂,考察了一定条件下PVDF和PVP的百分含量及PEG的分子量对膜孔径、机械性能、水通量及形貌结构的影响,用正交实验设计确定了制膜的最佳配方为:PVP含量14%,PVDF含量18%,PEG分子量为200。此配方下所制备的中空纤维膜圆整度较好,断裂强力为3.2 N,断裂伸长率为70%,泡点为0.43 MPa,平均孔径为0.081μm,纯水通量为178 L/(m~2·h)。
The preparation of polyvinylidene fluoride (PVDF) hollow fiber ultrafiltration membrane was studied by dry-wet phase inversion method. PVDF was used as membrane material, N, N-dimethylacetamide (DMAc) as solvent, polyvinylpyrrolidone (PVP) and polyethylene glycol (PEG) as additives to investigate the percentage of PVDF and PVP under certain conditions The influence of molecular weight of PEG on membrane pore size, mechanical properties, water flux and morphology was studied. The optimum formulation of the membrane was determined by orthogonal experimental design: PVP content of 14%, PVDF content of 18%, PEG molecular weight of 200 . The prepared hollow fiber membrane has good roundness, breaking strength of 3.2 N, breaking elongation of 70%, bubble point of 0.43 MPa, average pore diameter of 0.081 μm, pure water flux of 178 L / ( m ~ 2 · h).