粒子涂覆法制备超疏水PVDF中空纤维膜  

Super-hydrophobic modification of polyvinylidene fluoride hollow fiber membranes viaaparticle coating process

作　　者：闫荟荃 吕晓龙[1] 武春瑞[1] 高启君[1] 王暄[1] 贾悦[1] 陈华艳[1] 

机构地区：[1]省部共建分离膜与膜过程国家重点实验室,材料科学与工程工程学院,天津工业大学,天津300387

出　　处：《膜科学与技术》2017年第4期38-44,共7页Membrane Science and Technology

基　　金：国家自然科学基金(51278336);教育部长江学者与创新团队发展计划(IRT13084);天津市科技支撑计划重点项目(15ZCZDSF00070)

摘　　要：将刻蚀法和超滤涂覆法结合对膜表面进行疏水化处理.对聚偏氟乙烯(PVDF)粒子进行刻蚀,使其表面粗糙化,通过超滤方式将其涂覆在PVDF中空纤维膜表面,构建出微纳米粗糙结构的疏水膜表面,可获得表面接触角为159.7°的超疏水表面,同时膜孔不会被涂覆层堵塞.采用有一定溶解能力的分散液进行超滤涂覆,涂覆层和基膜之间发生溶剂化本体粘接,可明显提高涂覆层牢固性.PVDF粒子最佳刻蚀条件:刻蚀剂溶解度参数为19.11(J/cm^3)1/2,刻蚀时间为20min,温度为35℃.分散液溶解度参数为25.87(J/cm^3)1/2,粒子涂覆量为18.0g/m^2为最优涂覆条件.通过性能测试发现,涂覆膜表现出超疏水特性,同时其透水透气性能与原膜无明显变化.In this paper, a hydrophobization treatment for porous polyvinylidene fluoride （PVDF） hollow fiber membranes was achieved by an etching method combined with an ultrafiltration coating process. PVDF particle was subjected to an etching process to coarsen its surface. Etched PVDF particles were subsequently dispersed in a dispersant and then coated onto the PVDF hollow fiber membrane surface via ultrafiltration to construct a super-hydrophobic surface with a micro/nanostructure. After this process, the superhydrophobic PVDF hollow fiber membrane with the surface contact angle of 159. 7° was obtained, and the membrane pores were not blocked by the coating layer. The optimal etching conditions for the PVDF particles were as follows： solubility parameter of the etchant, 19. 11 （J/cm3）1/2; etching time, 20 min at 35℃. A super-hydrophobic surface with a stable particles coated layer is achieved in an optimal coating condition （solubility parameter of the dispersant, 25. 87 （J/cm3）1/2 PVDF particles coated, 18.0 g/m2）.

关 键 词：刻蚀 超滤涂覆 超疏水 本体粘接 

分 类 号：TQ051.893[化学工程]