PVC/PVB共混超滤膜性能研究及应用

通过将两种羟基含量相同、黏度不同的PVB，分别与PVC进行共混制备微孔膜，可以改善PVC膜性能．利用扫描电镜（SEM）对PVC／PVB共混膜进行了微观结构分析，并测试了PVC／PVB共混膜水通量和截留率．结果表明：加入PVB后改变了铸膜液的分相过程，从共混膜SEM照片的断面结构可见其皮层厚度增加，指状孔减少，且形成较多的界面微孔；两种PVC／PVB共混膜性能有一定的改善，水通量及截留率均有不同程度的提高．并且利用制备的PVC／PVB膜对造纸黑液进行了处理．

Study on the Performance and Application of Hybrid PVC/PVB Ultrafiltration Membrane

By selecting two grades of PVB resins with same hydroxyl content, but different viscosity, the PVB resins were blended with PVC respectively to form the microporous membrane. The performance of hybrid PVC/PVB membrane could be modified. The micro structure of PVC/PVB membranes were analyzed via SEM. The pure water flux and retention of membrane were evaluated. The results showed that the solution of PVC blended with PVB, the phase separation process was modified during casting film. Meanwhile, the surface was thicker, the quantity of finger pores decreased and interface pores increased simultaneously. The performance of two kinds of hybrid PVC/PVB membranes, that is the pure water flux and retention of membrane, were modified in certain. The sample membrane of hybrid PVC/PVB also applied in treatment the paper-making black liquor.