PVDF中空纤维膜纺丝配方对膜性能的影响  

Effect of spinning formula of PVDF hollow fiber membrane on membrane properties

作　　者：王献德 刘斌 赵晓丹 冯暨伟 张博丰 孙绿合 WANG Xiande;LIU Bin;ZHAO Xiaodan;FENG Jiwei;ZHANG Bofeng;SUN Lyuhe(Huadian Water Equipment(Tianjin)Company Limited,Tianjin 301700,China)

机构地区：[1]华电水务装备(天津)有限公司,天津301700

出　　处：《膜科学与技术》2022年第4期89-95,共7页Membrane Science and Technology

摘　　要：为优化聚偏氟乙烯(PVDF)中空纤维膜的纺丝配方,提高PVDF膜的性能,采用正交实验设计,通过改变PVDF质量分数、PVP质量分数和PEG相对分子质量的3个因素,考察了非溶剂致相分离法制备PVDF中空纤维膜过程中配方对膜性能与结构的影响.结果表明:铸膜液中PVDF质量分数越高,中空纤维膜的强度、拉伸伸长率越大,膜结构趋于致密,膜外表面孔减少,膜丝的孔径越小;PVP质量分数越高,膜丝通量越高,膜外表面孔增多.PEG相对分子质量对膜性能结果影响不明显.综合各性能参数之间的要求,考虑配方的设计,影响因素的主次顺序是PVDF质量分数、PVP质量分数、PEG相对分子质量,PVDF中空纤维膜纺丝配方的优选方案为PVDF质量分数14%、PVP质量分数20%、PEG相对分子质量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 relative molecular mass.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.The relative molecular mass of PEG has no obvious effect on the performance of the membrane.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 relative molecular mass.The optimal scheme can be PVDF mass fraction 14%,PVP mass fraction 20%and PEG relative molecular mass 600.

关 键 词：中空纤维膜 纺丝配方 强度 通量 

分 类 号：TQ051.893[化学工程]