Preparation and characterization of PTFE composite microfiltration membrane
XIAO Kai-sheng1,2, ZHANG Hao-fan1,2, WANG Zhen1,2, WANG Peng1,2, LU Yun-long3, CHEN Wen-qing1,2
1. SCU-HITACHI Environment Applied Technology Research Center, Sichuan University, Chengdu 610065, China; 2. College of Architecture and Environment, Sichuan University, Chengdu 610065, China; 3. Panzhihua West District Environmental Monitoring Station, Panzhihua 617068, China
Abstract: In order to solve the macro-porous defects and poor surface hydrophilicity of polytetrafluoroethylene (PTFE) hollow fiber membrane,PTFE composite microfiltration membrane is prepared through wrapping method with hydrophilic PTFE flat membrane as the filter layer and PTFE hollow fiber membrane as the support layer.Based on experiments,the optimum tensile ratio is 300%-200%.Under optimum tensile ratio,the pore sizes of PTFE composite membrane distribute uniformly with the most probable pore size of 0.35 μm,the proportion of the most probable pore size is 75.9%,the maximum pore size is less than 0.4 μm,the porosity exceeds 80%,the tensile strength reaches 9.15 MPa,the explosive strength exceeds 0.3 MPa,PTFE composite membrane filter layer has a contact angle of 70 degree,and the pure water flux achieves 1 107 L/(m2·h).
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