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以商品化聚偏氟乙烯(PVDF)中空纤维超滤膜为基膜,聚二甲基硅氧烷(PDMS)为涂膜材料制备PDMS/PVDF优先透有机物渗透汽化复合膜。用扫描电子显微镜(SEM)对膜结构进行表征,并研究了涂敷方法、基膜热处理工艺、PDMS浓度、固化温度及固化时间等因素对复合膜渗透汽化性能的影响。实验结果表明:基膜120℃下热处理,用10%的PDMS溶液,采用浸涂加真空涂敷的方法涂膜,110℃下交联固化6h制备的复合膜性能最佳。该复合膜在60℃时,分离5%的乙醇水溶液,分离因子可达到21.35,通量为331.21g/(m2·h)。
The PDMS / PVDF preferential organic matter pervaporation composite membrane was prepared by using PVDF hollow fiber membrane as base membrane and polydimethylsiloxane (PDMS) as coating membrane material. The structure of the membrane was characterized by scanning electron microscopy (SEM). The effects of coating method, heat treatment of base membrane, concentration of PDMS, curing temperature and curing time on the pervaporation performance of the composite membrane were studied. The experimental results show that the composite membranes prepared by heat treatment at 120 ℃, coating with 10% PDMS solution by vacuum coating and dipping and curing at 110 ℃ for 6h. The composite membrane at 60 ℃, the separation of 5% aqueous ethanol, the separation factor can reach 21.35, the flux of 331.21g / (m2 · h).