A kind of double-layer polymer separation membrane and preparation method thereof

Abstract

The invention proposes a method for preparing a double-layer film with excellent interlayer adhesion by modifying a polymer with a monomer having a special functional group. The present invention adds modified monomers with active groups and characteristic groups to the casting solution or spinning solution during the preparation process of the double-layer membrane, and utilizes the active group of the monomer to combine with the casting solution or spinning solution The polymers in the polymer undergo grafting reactions, and the characteristic groups of the monomers are used to enhance the intermolecular interaction with other polymers to improve the compatibility between the polymers and prepare a double-layer film with excellent interfacial adhesion. The method is applicable to the preparation of double-layer flat membranes and double-layer hollow fiber membranes, and can realize the preparation of double-layer membranes with interpenetrating structures at the interface under mild preparation conditions. The interpenetrating structure at the interface makes the prepared bilayer membrane have excellent interlayer adhesion 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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