论文部分内容阅读
研究了浸没沉淀相转化法制备聚偏氟乙烯(PVDF)微滤膜过程中挥发时间、凝胶浴温度、铸膜厚度和铸膜速度对成膜的形态结构、孔隙率、过滤性能以及污染性能的影响。结果表明,随挥发时间延长,成膜孔隙率变小,纯水通量先增加后减小,以10 s为挥发时间制得的膜抗污染性能最强;随凝胶浴温度的升高,孔隙率、纯水通量及抗污染性能先增大后减小,在45℃成膜污染速率最低;随铸膜厚度的增加,纯水通量逐渐减小,孔隙率呈现先增加后减小的规律,且铸膜厚度为0.25 mm时成膜抗污染性能最好。
The morphological structure, porosity, filtration performance and pollution performance of the film-forming process were investigated by the evaporation time, the temperature of the gel bath, the thickness of the casting film and the casting speed during the preparation of polyvinylidene fluoride (PVDF) microfiltration membrane by immersion-precipitation phase inversion Impact. The results showed that as the volatilization time prolonged, the porosity of the membrane became smaller and the flux of pure water first increased and then decreased, and the membrane prepared by volatilization time of 10 s showed the strongest antifouling property. With the increase of the temperature of the gel bath, The porosity, the pure water flux and the anti-pollution performance firstly increased and then decreased, and the film forming pollution rate was the lowest at 45 ℃. The pure water flux decreased gradually with the increase of the film thickness and the porosity increased first and then decreased The law, and the film thickness of 0.25 mm film when the best performance of anti-pollution.