Bacteriostatic polyurea composite reverse osmosis membrane, preparation method and application thereof

CN121338539BActive Publication Date: 2026-06-09GUANGDONG UNIV OF TECH

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: GUANGDONG UNIV OF TECH
Filing Date: 2025-12-15
Publication Date: 2026-06-09

AI Technical Summary

Technical Problem

Existing reverse osmosis membranes are susceptible to biofouling in complex aquatic environments, leading to decreased membrane flux, increased energy consumption, and difficulty in thorough cleaning. Existing antifouling mechanisms lack the ability to actively eliminate biofouling, making it difficult to solve the problem of biofouling.

Method used

A polyurea selective layer is formed by interfacial polymerization of polyamine monomers and aromatic polyisocyanate monomers, and quaternary ammonium salts or organophosphonic acid antibacterial functional monomers are introduced through surface grafting reaction to construct a covalently bonded antibacterial functional structure, thereby achieving active inactivation of microorganisms.

Benefits of technology

The prepared antibacterial polyurea composite reverse osmosis membrane has high antibacterial ability, excellent antifouling performance and separation performance, and a three-dimensional network structure, which significantly extends the cleaning cycle and service life.

✦ Generated by Eureka AI based on patent content.

Smart Images

Figure CN121338539B_ABST

Patent Text Reader

Abstract

The present application relates to the technical field of membrane separation and water treatment, and particularly relates to a bacteriostatic polyurea composite reverse osmosis membrane and a preparation method and application thereof. The preparation method constructs a polymerization reaction system by using polyamine monomers in an aqueous phase solution and aromatic polyisocyanate monomers in an organic phase solution to form a urea bond structure, and then introduces a bacteriostatic functional monomer through a surface grafting reaction to construct a bacteriostatic functional structure in the form of a covalent bond on the membrane surface, so that the prepared reverse osmosis membrane has the ability to actively inactivate microorganisms and prevents the formation of biofilms from the source. The reverse osmosis membrane not only has excellent separation performance and anti-fouling characteristics, but also, through surface grafting modification, endows the reverse osmosis membrane with persistent and efficient bacteriostatic capacity. The preparation method is simple, mild and low in energy consumption, and can be suitable for large-scale production. The reverse osmosis membrane is suitable for drinking water treatment, high-biological-load industrial wastewater and seawater desalination and other application scenarios with strict requirements for biological pollution, and has excellent application prospects.

Need to check novelty before this filing date? Find Prior Art