聚偏氟乙烯大孔超滤膜的研究

Study on Large Pore Size Ultrsfiltrstion Membrane of Polyvinylidene fluoride(PVDF).

以国产聚偏氟乙烯（ＰＶＤＦ）为原料，选择不同种类的单一溶剂、混合溶剂和添加剂为铸膜液组成，研究了若干制膜因素对膜性能的影响，采用混合溶剂ＤＭＡＣ／ＡＣ之比控制ＡＣ含量在４０％─６０％，添加剂含量在１０％─２０％，制膜的气氛温度为２５—３０Ｃ，铸膜液温度为５０℃左右，可制得截留分子量为１５万和２４万，透水速度达３０—７０ｍｌ／（ｃｍ２·ｈ），截留率为９０％以上的大孔超滤膜。

A study on the preparation of large pore size ultrafiltration membrane of PVDF was reported in this paper. The effect of main parameters,such as solvents,additives and temperature, on the membrane properties was discussed. The membranes with a weight cut--off of 240000 and 150000 were prefared.The flux of 30--70 ml/(cm2.h) and the rejection rate above 90% can be achieved.