Graft-modified membranes and methods of making, water treatment methods and systems employing the same

By using petrolatum sealing and EDC/NHS crosslinking reaction, combined with imidazolidinyl urea and Boc2O/DMAP treatment, the problems of antifouling and acid and alkali resistance of reverse osmosis membranes were solved, extending the service life of the membrane and improving permeability and antibacterial properties.

CN120754709BActive Publication Date: 2025-11-21HANGZHOU HAINA ENVIRONMENTAL PROTECTION TECH CO LTD
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Patent Information

Application Number
CN202511241930.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-09-02
Publication Date
2025-11-21
Estimated Expiration
2045-09-02

AI Technical Summary

Technical Problem

Existing reverse osmosis membrane technology has shortcomings in terms of antifouling performance and acid and alkali resistance, resulting in decreased membrane permeability, short service life, and susceptibility to microbial contamination.

Method used

A temporary protective membrane is formed by sealing the membrane pores with petrolatum, combining EDC/NHS crosslinking reaction and introducing imidazolidinyl urea. The membrane's acid and alkali resistance and stability are improved by Boc2O and DMAP treatment, and the hydrophilicity is improved by introducing ether bonds.

Benefits of technology

It extends the service life of the membrane, improves the membrane's permeability and antibacterial properties, adapts to a wider range of acid and alkaline environments, and reduces the decline in desalination rate.

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Abstract

A grafted modified membrane, a preparation method thereof, and a water treatment method and system using the same. The preparation method of the grafted modified membrane comprises: sealing the mesh of a membrane for filtration with vaseline, keeping the surface clean and hydrophilic; immersing the membrane surface in an aqueous solution of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride for 10-20 min; adding N-hydroxysuccinimide to the aqueous solution; adding an aqueous solution of a polymer containing primary amino groups to the aqueous solution, standing in the dark for 8-24 h; and cleaning the membrane surface to obtain the grafted modified membrane. The grafted modification method of the application can form a temporary protective film, and at the same time strengthen the strength of the protective film and reserve a gap for destroying the protective film, so that the service life of the membrane can be prolonged through multiple grafting and destruction operations, and the antibacterial property of the membrane surface can be enhanced and bacterial growth can be reduced due to the grafted imidazole alkyl urea.
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