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以绿色环保的1,3-二甲基-2-咪唑啉酮(DMI)为增塑剂,采用复合热致相分离法制备了二醋酸纤维素(CDA)超滤膜。通过扫描电子显微镜(SEM)观察以及纯水通量、牛血清白蛋白(BSA)截留率、孔隙率和拉伸强度等测试,研究了CDA固含量对超滤膜结构和性能的影响。同时,通过综合比较不同固含量CDA膜的纯水通量和蛋白截留率,确定了最佳铸膜液配方。结果表明:提高CDA的固含量可以消除膜截面中的大孔结构,但同时降低了膜的孔隙率。其中,当铸膜液中CDA固含量为20%时,所制备平板膜的拉伸强度高达6.10 MPa,对0.1 g/L BSA水溶液的渗透通量为47.7 L/(m~2·h),截留率达到96.4%。
Diacetate cellulose (CDA) ultrafiltration membrane was prepared by composite thermal induced phase separation method with green-friendly 1,3-dimethyl-2-imidazolidinone (DMI) as plasticizer. The effects of CDA solid content on the structure and properties of ultrafiltration membranes were investigated by scanning electron microscopy (SEM), pure water flux, BSA rejection, porosity and tensile strength. At the same time, the optimal formula of casting solution was determined by comprehensive comparison of pure water flux and protein rejection of CDA membrane with different solid content. The results show that increasing the solid content of CDA can eliminate the macropore structure in the membrane cross section, but at the same time, the porosity of the membrane is reduced. Among them, the tensile strength of the prepared flat membrane was up to 6.10 MPa when the solid content of CDA in the casting solution was 20%, the permeation flux to 0.1 g / L BSA aqueous solution was 47.7 L / (m ~ 2 · h) Retention rate of 96.4%.