混合溶剂制备醋酸纤维素膜及其性能

以醋酸纤维素、丙酮、N-甲基吡咯烷酮(NMP)和聚乙二醇400(PEG-400)为原料，采用相转化法制备醋酸纤维素膜，对其结构和形貌进行了表征；在室温、操作压力0.1 MPa下，用去离子水和500 mg/L PEG-600溶液分别测定膜的水通量和截留率，考察了混合溶剂中丙酮和NMP含量、反应温度和致孔剂PEG-400含量对醋酸纤维素膜性能的影响. 结果表明，NMP含量60%(w)、丙酮含量22.5%(w)、反应温度60℃及PEG-400含量6%(w)条件下，所制醋酸纤维素膜表面光滑，孔径分布均匀，水通量达212.87 L/(m2×h)，截留率达87.67%.

Preparation and Performance of Cellulose Acetate Membrane with Mixed Solvents

Cellulose acetate (CA) membrane was prepared by liquid-solid phase inversion method with cellulose acetate, acetone, N-methylpyrrolidone (NMP) and polyethylene glycol 400 (PEG-400) as raw materials. The structure and morphology of CA membrane were characterized. At room temperature, the prepared CA membrane was used to treat deionized water and 500 mg/L polyethylene glycol 600 under the pressure of 0.1 MPa in its water flux and rejection rate, respectively. The effects of mixed solvent content, reaction temperature and PEG-400 content on the separation properties of membrane were examined. The results showed that under the conditions of NMP and PEG-400 contents of 60% and 6%(w), and reaction temperature of 60℃, the prepared CA membrane surface was smooth and the pore size distribution uniform, its water flux was 212.87 L/(m2×h), and the rejection rate 87.67%.