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采用溶胶-凝胶模板法,以三嵌段共聚物PEO20PPO70PEO20(P123)为模板剂,制备SiO2中间层膜以改善SiO2复合膜的渗透和分离性能。比较了模板剂含量对溶胶粒径和膜孔径的影响。研究表明:随着模板剂含量的增加,溶胶粒子的尺寸和所制备的中间层的孔径随之增加;中间层的加入利于制备出孔径分布窄,孔隙率高的SiO2复合膜。相对于无中间层膜,复合膜具有较高的渗透量和分离性能。在跨膜压差0.04MPa时,复合膜对氮气的渗透系数可达5×10-8mol/m2s Pa,正己烷/氮气的分离因子为2.6。
The sol-gel template method and the triblock copolymer PEO20PPO70PEO20 (P123) as templating agent were used to prepare SiO2 interlayer films to improve the permeability and separation performance of SiO2 composite films. The effect of template content on sol particle size and membrane pore size was compared. The results show that with the increase of the content of template, the size of the sol particles and the pore size of the prepared intermediate layer increase. The addition of the intermediate layer facilitates the preparation of the SiO2 composite membrane with narrow pore size distribution and high porosity. Compared with no interlayer film, the composite film has higher penetration and separation performance. When the transmembrane pressure is 0.04MPa, the permeability coefficient of the composite membrane to nitrogen is 5 × 10-8mol / m2s Pa and the separation factor of n-hexane / nitrogen is 2.6.