膜科学与技术

PVDF中空纤维膜纺丝配方对膜性能影响的探究

作者：王献德，刘斌，赵晓丹，冯暨伟，张博丰，孙绿合

单位：华电水务装备（天津）有限公司,天津,301700

关键词：中空纤维膜纺丝配方强度通量

出版年,卷(期):页码： 2022,42(4):89-95

摘要：

为优化聚偏氟乙烯（PVDF）中空纤维膜的纺丝配方，提高膜的性能，本文采用正交试验设计，通过PVDF质量分数、PVP质量分数、PEG分子量三个因素，研究干湿相转化法制备PVDF中空纤维膜过程中配方对膜性能结构的影响。通过试验测试，可得到以下结论: 铸膜液中PVDF质量分数越多，中空纤维膜的强度、拉伸伸长率都越大，PVDF质量分数是最显著的影响因素；PVP质量分数越多，膜丝通量越高； PVDF质量分数越高，膜丝的孔径越小；通过SEM图对膜丝的形态结构分析， PVDF质量分数增高，膜结构趋于致密，膜外表面孔减少；随着PVP的增多，膜外表面孔增多。综合考虑各个性能参数之间的要求，考虑配方的设计，因素的主次顺序是PVDF质量分数、PVP质量分数、PEG分子量，优选方案可以是PVDF质量分数14%、PVP质量分数20%、PEG分子为600。

In order to optimize the spinning formula of PVDF hollow fiber membrane and improve the performance of PVDF membrane, the effects of the formula on the performance and structure of PVDF hollow fiber membrane prepared by Non solvent induced phase separation method were discussed by using orthogonal experimental design and three factors: PVDF mass fraction, PVP mass fraction and PEG molecular weight. The results showed that the higher the mass fraction of PVDF in the casting solution, the greater the strength and tensile elongation of the hollow fiber membrane. Through the morphological structure analysis of the membrane fibers, the higher the mass fraction of PVDF, the denser membrane fibers structure, the fewer pores of surface face of the membrane fibers, and the smaller pores diameter of the membrane fibers; The higher the mass fraction of PVP, the higher the flux of membrane fibers and the more pores on the outer surface of membrane fibers. Considering the requirements of various performance parameters and the design of formula, the primary and secondary order of factors is PVDF mass fraction, PVP mass fraction and PEG molecular weight. The optimal scheme can be PVDF mass fraction 14%, PVP mass fraction 20% and PEG molecular weight 600.

王献德（1982—），男，广西平南县人，工程师，硕士，长期从事膜技术开发与应用相关工作

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