正交实验设计方法优化膜蒸馏用聚丙烯平板疏水微孔膜的制备条件

Optimal preparation conditions of polypropylene flat sheet hydrophobic microporous membranes for MD by orthogonal test design method

采用热致相分离方法制备了膜孔径分布为0．02～0．1μm的聚丙烯平板疏水微孔膜．用正交实验设计方法对聚丙烯平板膜的制备方法进行优化设计．在正交实验设计条件下，以纯水和浓度为0．5mol／L的NaCl水溶液真空膜蒸馏实验特性，确定了聚丙烯平板疏水微孔膜优化制备条件．在研究范围内，此优化制备条件为：稀释剂为豆油、iPP（质量分数）为27％、等规聚丙烯（iPP）熔融指数（MI）为16．08g／10min、淬冷温度为20℃、成核剂己二酸含量（质量分数）为0．5％、萃取剂为正己烷、铸膜液温度为190℃、刮板温度为210℃．

Narrow pore size distribution hydrophobit mieroporous membranes show a good performancein membrane distillation（MD）. The 0.02--0.1μm pore size distribution isotactic polypropylene （iPP） hydrophobic mi- croporous membranes were developed via thermally induced phase separation （TIPS） for MD in this study. Orthogonal test design was adopted to obtain the optimal conditions for preparing iPP flat sheet hydrophobie microporous membranes. The VIVID performance of pure water and 0.5 mol/L NaCl aqueous solution was studied at the conditions of orthogonal test design. The optimal conditions of iPP membranes preparation for MD under experiment conditions was： the diluent was soybean oil, the concentration of iPP in casting solutions was 27 %, melt - index （MI） of iPP was 16.08 g/10 min, the quench temperature of water bath was 20 ℃, the nucleating agent was adipic acid and the concentration was 0.5 %, the extractant was hexane, the temperature of casting solutions was 190 ℃ and the temperature of steel plate was 210 ℃.