Double-layer polymer separation membrane and application thereof

Abstract

The invention provides a double-layer polymer separation membrane and an application thereof. In the preparation process of the double-layer membrane, a modified monomer with an active group and a characteristic group is added into a membrane casting solution or a spinning solution, the active group of the monomer and a polymer in the membrane casting solution or the spinning solution are subjected to a grafting reaction, and the characteristic group of the monomer is used for enhancing the intermolecular interaction with other polymers; the compatibility between polymers is improved, and the double-layer membrane with excellent interface cohesiveness is prepared. The method is suitable for preparing a double-layer flat sheet membrane and a double-layer hollow fiber membrane at the same time, and a double-layer membrane with an interpenetrating structure at an interface can be prepared under a mild preparation condition. Due to the interpenetrating structure at the interface, the prepared double-layer membrane has excellent interlayer cohesiveness and lower mass transfer resistance.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a method for preparing a double-layer membrane with excellent interlayer adhesion by using a monomer-modified polymer with a special functional group. Background technique [0002] As a pillar industry of national economic development, process industry provides basic material guarantee for social development. The material separation and purification process in the process industry occupies a huge energy consumption, and is accompanied by a large amount of solid, liquid and gaseous waste discharge. As an emerging separation technology, membrane separation technology has the advantages of low energy consumption, high separation precision, and environmental friendliness. Coupling it with traditional separation and purification processes can realize technological innovation and industrial upgrading to eliminate backward production capacity and reduce environme...

AI Technical Summary

Problems solved by technology

[0005] The difference in compatibility between the two layers of polymers, the difference in mechanical properties, the matching of the film-forming conditions of the two layers of casting solution (spinning solution), and many other factors or their coupling effects will cause the interlayer bonding force of the double-layer film to be weak, thereby Causes delamination of bilayer films during preparation or application

Due to the delamination phenomenon of the double-layer membrane, the separation performance is reduced and the service life is shortened, which has become a technical bottleneck hindering the development of the double-layer membrane.

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