A long-lasting antifouling polyamide reverse osmosis membrane, its preparation method and applications

By introducing monoamino-terminated hyperbranched polyglycerol into the polyamide network during interfacial polymerization, the problem of easy fouling of polyamide reverse osmosis membranes was solved, and a polyamide reverse osmosis membrane with high hydrophilicity and long-term anti-fouling performance was achieved, while maintaining good water flux and desalination performance.

CN122032343BActive Publication Date: 2026-07-17AQFILM MEMBRANE MATERIALS (JIAXING) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
AQFILM MEMBRANE MATERIALS (JIAXING) CO LTD
Filing Date
2026-04-13
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing polyamide reverse osmosis membranes are susceptible to organic, biological, and colloidal fouling during operation, leading to decreased membrane flux, shortened operating cycles, and increased cleaning frequency. Traditional hydrophilic modified layers are prone to detachment, making it difficult to achieve long-term anti-fouling effects.

Method used

During the interfacial polymerization process, monoamine-terminated hyperbranched polyglycerol is introduced and covalently grafted into the polyamide network to form a stable hydrophilic and antifouling structure. The hyperbranched polyglycerol is enriched and firmly fixed on the membrane surface by reacting with the primary amine end group with the acyl chloride monomer.

Benefits of technology

It significantly improves the hydrophilicity and antifouling properties of the membrane surface, maintains good water flux and desalination performance, avoids the problem of peeling off traditional modified layers, and achieves long-term and stable antifouling effect.

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Abstract

A long-lasting antifouling polyamide reverse osmosis membrane, its preparation method, and its applications are disclosed, belonging to the field of membrane separation technology. The membrane comprises a porous support layer and a polyamide selective layer on its surface. The polyamide selective layer is covalently grafted with monoamine-terminated hyperbranched polyglycerol. The monoamine-terminated hyperbranched polyglycerol is grafted into the polyamide network through the reaction of its terminal primary amine groups with acyl chloride monomers during interfacial polymerization. This enriches the multi-hydroxyl branched structure of the hyperbranched polyglycerol on the membrane surface, forming a stable hydrophilic antifouling structure. The aforementioned long-lasting antifouling polyamide reverse osmosis membrane, its preparation method, and its applications result in a membrane with long-lasting and stable antifouling performance, strong hydrophilicity, and a simple preparation process, making it easy to industrialize.
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Citation Information

Patent Citations

  • CN104069749A

  • CN107824057A