聚四氟乙烯（PTFE）微滤膜亲水化改性工艺优化

摘要

By using plasma as pretreatment,the hydrophilic TiO 2 / PAA/ PTFE composite membrane was prepared via the coordination between acrylic acid and TiO2 . In this study,Plackett-Burman Design was adopted to evaluate the effect of following factors,plasma power,plasma treating time,AA concentration,polymerization temperature,polymerization time and dipping time in TiO 2 solution,to such characters and performances of composite membranes as average pore size,contact angle,water flux and fouling rate. The optimization of processing parameters was formulated further by the response optimization carried out by Minitab. The resultant membrane owns excellent performances with average pore size of 0. 89 μm,the contact angle of 43°,and pure water flux of 5 814 L/(m2 ·h)when the optimized combination of processing parameters are as following:plasma power of 70 W,plasma treating time of 60 s,AA concentration of 20%,polymerization temperature of 80 ℃,polymerization time of 2 h,dipping time in TiO 2 solution of 5 min.%该文以等离子体为预处理手段，通过活性基团丙烯酸与二氧化钛的配位键合作用，制得亲水性的 TiO 2／ PAA／ PTFE膜。通过 Plackett-Burman设计试验，考察了等离子体处理功率、等离子体处理时间、AA 浓度、AA 聚合温度、AA 聚合时间、TiO2反应时间对改性膜的平均孔径、纯水接触角、纯水通量和膜污染速率的影响。通过响应优化拟合，得到最佳工艺条件为：等离子体处理功率为70 W；等离子体处理时间为60 s；AA浓度为2％；AA聚合温度为80℃；AA聚合时间为2 h；TiO 2反应时间为5 min。优化合意性为0．98。优化后改性膜的各项性能分别可以达到平均孔径为0．89μm、纯水接触角为43°、纯水通量为5814 L／（m2·h）。