第2凝固浴对气-液膜接触器用PVDF膜润湿性能的影响  

Effect of the Second Coagulation Bath Composition on Wettability of Polyvinylidene Fluoride for Gas-liquid Membrane Contactor

作　　者：李颖娜[1,2] 徐志彬 张清 张建生[1] 张玉忠[2] 孙秀君[1] 

机构地区：[1]唐山学院环境与化学工程系,河北唐山063000 [2]天津工业大学材料科学与工程学院,天津300387 [3]河北出入境检验检疫局检验检疫技术中心,河北唐山063611

出　　处：《水处理技术》2017年第12期70-73,共4页Technology of Water Treatment

基　　金：河北省科技计划项目(13273707;16211243);河北省唐山市科技计划项目(14130238B)

摘　　要：以聚偏氟乙烯(PVDF)为基膜材料,以乙醇为第1凝固浴,以不同N-甲基吡咯烷酮(NMP)含量的水溶液为第2凝固浴,采用双凝固浴法制备了高疏水和高透气的PVDF膜。结果表明,以水作为凝固浴时,PVDF膜的空气侧较为平整,当用双凝固浴时,PVDF膜空气侧开孔结构和无皮层结构逐渐明显,PVDF膜基底侧较为粗糙;随着NMP含量的增大,膜的接触角先增大后减小,当第2凝固浴中的NMP的质量分数为50%时,接触角、最小液体渗透压力、通气量最大,分别为141.9°、35 kPa、540 L/h。Using polyvinylidene fluoride （PVDF） as basement membrane material, ethanol as the first coagulation bath, water solution with different N- methylpyrrolidone （NMP） content as the second coagulation bath, the high hydrophobic and high permeability PVDF membranes were fabricated by dual bath coagulation method. The results showed that the top surface of PVDF membrane with water as coagulation bath was smooth, the top surface of PVDF membrane with NMP water solution as coagulation bath was open structure and none skin, and the bottom surface of PVDF membrane with NMP water solution as coagulation bath was rough. When the mass fraction of NMP was 50% in the second coagulation bath, the contact angle, LEPw and maximum throughput was 141.9°, 35 kPa and 540 L/h respectively.

关 键 词：聚偏氟乙烯膜 第2凝固浴 气-液膜接触器 润湿性能 

分 类 号：TQ028.8[化学工程]