膜科学与技术

提高硅橡胶的黏附性制备多层复合膜

作者：张旭，孟令鹏，李培

单位：北京化工大学，材料科学与工程学院，北京 100029

关键词： PDMS；Pebax；多层复合膜；CO2分离

出版年,卷(期):页码： 2020,40(6):37-43

摘要：

气体分离膜通常以多层复合膜的形式为主。在最外层皮层和多孔支撑层之间的中间层聚合物需要有高气体传质性能和优异的涂覆性能。硅橡胶（PDMS）是理想的中间层材料，然而其低表面能难以黏附第二层涂覆材料。本文以商业化的硅橡胶和添加剂为原料。通过优化添加剂配比，有效地提高了PDMS层的黏附力，并制备了Pebax/PDMS/PAN三层中空纤维复合膜。当硅橡胶与添加剂配比为1：3，Pebax涂覆液的质量浓度为3 wt%时，复合膜的CO2通量为115.6 GPU，CO2/N2选择性为29.3。证明经过调控的硅橡胶层表面更容易黏附连续的无缺陷Pebax层。

Gas separation membranes typically have multi-layer structures with a gutter layer. The gutter layer shall have high gas permeability and good coating property. Polydimethylsiloxane(PDMS) is an ideal gutter layer material. Its low surface energy is good for coating on to other materials. However, other materials are difficult to be coated on PDMS. In this study, we used commercially available PDMS and CRA additives. We studied the functionality of CRA on the increments of adhesive property of PDMS. When the composition of PDMS to CRA was 1:3 (w:w), a three layer hollow fiber composite membrane Pebax/PDMS/PAN was successfully prepared. The CO2 permeance and CO2/N2 selectivity of the composite membrane were 115.6 GPU, and 29.3, respectively. This result demonstrated that the Pebax layer was successfully coated onto the PDMS surface.

张旭（1995-），男，山东菏泽人，硕士，从事气体分离膜研究。E-mail：zx18765039316@163.com

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