Deeply modified coating and deeply modified coating composite separation membrane
By preparing a deep-modified coating on the surface and inside the pores of the substrate membrane and combining it with an interfacial polymerization process, the problem that conventional coating modification cannot improve the adsorption capacity of amine monomers in the substrate membrane is solved, and the desalination performance and ion selectivity of the composite separation membrane are significantly improved.
Patent Information
- Application Number
- CN202311593636.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-27
- Publication Date
- 2026-04-21
- Estimated Expiration
- 2043-11-27
AI Technical Summary
In existing technologies, conventional coating modification only modifies the substrate surface and fails to effectively improve the amine monomer adsorption capacity of ultrafiltration or microfiltration membranes, resulting in limited performance improvement of composite separation membranes.
A deep-modified coating was prepared on the surface of the substrate and inside the pores using a surface tension gradient-driven Marangoni convection process. The stability of the coating was enhanced by a crosslinking agent, and a dense ultrathin separation layer was prepared by an interfacial polymerization process to form a deep-modified coating composite separation membrane.
It significantly improves the adsorption capacity of the bottom membrane for amine monomers, promotes the diffusion-reaction process in the interfacial polymerization process, and thus enhances the desalination performance and selectivity of mono/divalent anions of the composite separation membrane.