Multi-layer composite membrane has attracted more and more attention in the field of gas separation, especially for CO₂ separation, and the intermediate layer (or gutter layer) has a significant influence on the performance of the multi-layer composite membrane. However, due to low gas permeance, current commercial gas separation membranes cannot be used as the intermediate layers with which to fabricate multi-layer composite membranes with high gas permselectivity. Aiming at oxygen enrichment application and developing proper large-area intermediate layer for multi-layer composite membrane, the scaling-up process of the flat membrane with ultra-high permeance was investigated in detail by using the most common material for intermediate layer and a substrate with extremely high gas permeance. In the lab-scale, through simply adjusting the relative humidity and prepolymer concentration, the coating solution with an appropriate cross-linking degree could be successfully prepared in 10 minutes. In view of the low viscosity of the coating solution, a consecutive membrane fabrication machine with the dip-blade coating unit was specifically designed to scale up the membrane. Using a firstly proposed wet-dry combined coating method, the defect-free flat membrane with a width of 1 m was successfully prepared, which had uniform performance in both the transverse and longitudinal directions. The O₂ and CO₂ permeance of the prepared large-area membrane could reach 2000 and 10000 GPU respectively, which was the highest among the reported membranes prepared with similar materials.

多层复合膜在气体分离领域，尤其是对于CO ₂领域越来越受到关注。分离，中间层（或檐槽层）对多层复合膜的性能有重大影响。然而，由于低的气体渗透性，当前的商业气体分离膜不能用作制造具有高的气体渗透性的多层复合膜的中间层。针对氧气富集的应用，并为多层复合膜开发合适的大面积中间膜层，采用最常见的中间层和基质材料，对超高渗透率平板膜的放大工艺进行了详细研究。气体渗透率极高。在实验室范围内，只需调整相对湿度和预聚物浓度，具有合适的交联度的涂料溶液可以在10分钟内成功制备。考虑到涂布溶液的低粘度，特别设计了具有浸刀式涂布单元的连续膜制造机以放大膜。使用首次提出的干湿结合涂覆方法，成功制备了宽度为1 m的无缺陷平膜，该膜在横向和纵向均具有均匀的性能。O 在横向和纵向均具有均匀的性能。O 在横向和纵向均具有均匀的性能。O制备的大面积膜的₂和CO ₂渗透率分别达到2000和10000 GPU，在报道的用相似材料制备的膜中最高。