为解决聚四氟乙烯（PTFE）中空纤维膜大孔缺陷和表面亲水性差的问题，采用亲水性PTFE平板膜作过滤层，PTFE中空纤维膜作支撑层，通过裹缠的方法制备PTFE复合微滤膜。实验中最佳的拉伸倍率为300%~200%，在此拉伸倍率下，PTFE复合膜孔径分布均匀，最可几孔径为0.35 μm，最可几孔径占比为75.9%，最大孔径小于0.4 μm，孔隙率大于80%，拉伸强度达到了9.15 MPa，爆破强度大于0.3 MPa，PTFE复合膜过滤层接触角为70°，纯水通量为1 107 L/（m²·h）。

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).

肖凯升(1990-),男,硕士研究生,研究方向为环境功能材料的研究与应用,276537833@qq.com