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以H2O/DMAc为共溶剂,相转化法制备了PVDF/PVP平板超滤膜,考察了非溶剂水添加量对相分离进程、膜结构参数、膜分离性能的影响规律,观察了膜的微观形貌。结果显示,随着体系中含水量由1%～5%变化时,相转化成膜固化时间缩短,膜表面孔数增多,支撑层逐渐疏松,膜断面大孔结构变化丰富,呈现不规律变化,但膜平均孔径相对稳定。含水量由0%变化至5%,膜纯水通量从850 L/(m2.h)上升到1 250 L/(m2.h),BSA截留率基本保持在85%以上,在3%时最高,5%时有所下降。
The PVDF / PVP plate ultrafiltration membrane was prepared by phase inversion method using H2O / DMAc as cosolvent. The influence of the amount of non-solvent water on phase separation process, membrane structure parameters and membrane separation performance was investigated. appearance. The results showed that as the water content in the system changed from 1% to 5%, the solidification time of phase inversion film was shortened, the number of holes in the surface of the membrane increased, the support layer became loose, the macropore structure of the membrane changed abundantly, However, the average pore size is relatively stable. The change of water content from 0% to 5%, membrane pure water flux increased from 850 L / (m2.h) to 1 250 L / (m2.h), BSA retention rate remained above 85%, at 3% The highest, 5% decline.