Monovalent selective cation exchange membrane and preparation method thereof

The monovalent selective cation exchange membrane is prepared by free radical polymerization, which solves the problem of modified layer shedding and achieves membrane stability and efficient production. It is suitable for lithium extraction from salt lakes, seawater desalination and other fields.

CN120789935APending Publication Date: 2025-10-17GUANGDONG BRUNP RECYCLING TECH CO LTD +3
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Patent Information

Application Number
CN202510980177.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-16
Publication Date
2025-10-17

AI Technical Summary

Technical Problem

The modified layer of existing monovalent selective cation exchange membranes is unstable and easily falls off, resulting in a short service life.

Method used

The monovalent selective cation exchange membrane is prepared by free radical polymerization. By coating a prepolymer solution on two layers of substrate membranes and performing free radical polymerization, a non-interface integrated membrane material is formed. The modified layer is fused with the cation exchange membrane body to avoid interface detachment.

Benefits of technology

The prepared monovalent selective cation exchange membrane has good stability in brine of different concentrations, tolerates chemical cleaning, has low production cost, is suitable for a variety of application requirements, has adjustable separation performance, and has a simple and efficient process.

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Abstract

The invention belongs to the technical field of membrane separation, and particularly relates to a monovalent selective cation exchange membrane and a preparation method thereof, the preparation method comprises the following steps: (1) mixing a first exchange monomer, a first cross-linking agent, a first solvent and a first initiator to obtain a first prepolymer solution; (2) mixing a second exchange monomer, a second cross-linking agent, a second solvent and a second initiator to obtain a second prepolymer solution; (3) coating the first prepolymer solution on a first substrate film to obtain a first composition; (4) coating a second substrate film with the second prepolymer solution to obtain a second composition; and (5) oppositely laminating the coating surfaces of the first composition and the second composition, and stripping the first substrate membrane and the second substrate membrane after initiation polymerization is completed, so as to obtain the monovalent selective cation exchange membrane.
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