PVDF-PAN-纳米粘土杂化中空纤维超滤膜纺丝工艺研究  

STUDY ON SPINNING TECHNOLOGY OF PVDF-PAN-ORGANIC NANO-CLAY COMPOSITE HOLLOW FIBER UF MEMBRANE

作　　者：郑伟萍[1] 高学理[1] 马玉新[1] 王铎[1] 王立国[2] 高从堦[1] 

机构地区：[1]中国海洋大学化学化工学院,山东青岛266100 [2]济南大学化学化工学院,山东济南250022

出　　处：《水处理技术》2010年第11期107-112,共6页Technology of Water Treatment

基　　金：国家重点基础研究发展计划(973)项目(2009CB623402)

摘　　要：以聚偏氟乙烯和聚丙烯腈为主要膜材料、N,N-二甲基乙酰胺为溶剂、无水LiCl和有机纳米粘土为添加剂,采用干-湿相转化法纺丝工艺制备杂化中空纤维超滤膜,研究了干程、外凝胶浴温度、芯液温度和组成等纺丝工艺参数对杂化膜微观结构和分离性能的影响。SEM观察发现,中空纤维膜有较致密的外表面和多孔的内表面,干程对膜的横截面结构和表面形态都有影响;增加芯液含量有利于抑制大孔结构的产生,使孔径变小,结构致密,芯液为质量分数40%无水乙醇时,制得的膜对BSA截留率达到99%。试验结果表明,在较高的凝胶浴温度和较大的干程下制得的膜有较高的水通量和较低的截留率;凝胶浴温度升高,膜的力学性能加强,铸膜液中聚合物的质量分数为16%时,最大拉伸强度为3.16MPa。Polyvinylidene fluoride （PVDF）-Polyacrylonitrile （PAN）-organic nano-clay composite hollow fiber ultrafiltraton membrane was prepared by dry-wet spinning method. The main membrane material was PVDF which was commixed with PAN and the mass ratio of PVDF and PAN was 9：1. N,Ndimethyl acetamide was the solvent and anhydrous LiCl was employed as non-solvent additive. The effect factors such as air gap,external coagulant temperature,bore fluid temperature and so on were investigated. The effect of preparation technology on pure water flux,rejection of bovine serum albumin （BSA）,porosity and tensile strength was studied. In addition,the structure and morphology of hollow fiber UF membranes were studied by scanning electron microscope （SEM）. It was found that preparation technology affected both the structure and performance of hollow fiber membranes. Water flux increased with increasing temperature and air gap while rejection of BSA was the opposite. Elevated temperature was beneficial to mechanical properties and the maximum tensile strength was 3.16 MPa. Increase in concentration of bore fluid was conducive to inhibit the production of macroporous structure.

关 键 词：聚偏氟乙烯 聚丙烯腈 中空纤维超滤膜 有机纳米粘土 

分 类 号：TQ028.8[化学工程]