申请人:Taiwan Textile Research Institute
公开号:US10675590B2
公开(公告)日:2020-06-09
A preparation method of separation membrane is provided. First, a polyimide composition including a dissolvable polyimide, a crosslinking agent and a solvent is provided. The dissolvable polyimide is represented by formula 1:
wherein B is a tetravalent organic group derived from a tetracarboxylic dianhydride containing aromatic group, A is a divalent organic group derived from a diamine containing aromatic group, A′ is a divalent organic group derived from a diamine containing aromatic group and carboxylic acid group, and 0.1≤X≤0.9. The crosslinking agent is an aziridine crosslinking agent, an isocyanate crosslinking agent, an epoxy crosslinking agent, a diamine crosslinking agent, or a triamine crosslinking agent. A crosslinking process is performed on the polyimide composition. The polyimide composition which has been subjected to the crosslinking process is coated on a substrate to form a polyimide membrane. A wet phase inversion process is performed on the polyimide membrane.
本发明提供了一种分离膜的制备方法。首先,提供一种聚酰亚胺组合物,包括可溶解聚酰亚胺、交联剂和溶剂。可溶解聚酰亚胺由式 1 表示:
其中 B 是由含芳香族基团的四羧酸二酐衍生的四价有机基团,A 是由含芳香族基团的二胺衍生的二价有机基团,A′ 是由含芳香族基团的二胺和羧酸基团衍生的二价有机基团,0.1≤X≤0.9。交联剂为氮丙啶交联剂、异氰酸酯交联剂、环氧交联剂、二胺交联剂或三胺交联剂。对聚酰亚胺组合物进行交联处理。将经过交联工艺的聚酰亚胺组合物涂在基底上,形成聚酰亚胺膜。对聚酰亚胺膜进行湿相反转处理。