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Hydrophility anti-pollution polyamide composite reverse osmosis membrane and preparation method thereof

A reverse osmosis membrane, anti-pollution technology, applied in the field of water treatment, can solve the problems of inability to form a hydrophilic coating, low activity, limited amount of active groups, etc., and achieve good hydrophilicity, anti-pollution ability, and graft density. The effect of high and short process flow

Inactive Publication Date: 2015-04-22
HUNAN OVAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited amount of active groups remaining on the surface of the polyamide layer and its low activity, the number of covalently grafted hydrophilic polymer molecular brushes on the surface is also limited, and a dense hydrophilic coating cannot be formed, resulting in composite The membrane has poor hydrophilicity and low anti-fouling ability

Method used

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  • Hydrophility anti-pollution polyamide composite reverse osmosis membrane and preparation method thereof
  • Hydrophility anti-pollution polyamide composite reverse osmosis membrane and preparation method thereof
  • Hydrophility anti-pollution polyamide composite reverse osmosis membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] With the cross-linked polyamide composite reverse osmosis membrane of comparative example 1 as the cross-linked polyamide composite reverse osmosis membrane to be grafted;

[0025] Rinse the surface of the cross-linked polyamide composite reverse osmosis membrane (cross-linked polyamide layer) to be grafted with deionized water, then purge the membrane surface with nitrogen to no droplets; prepare an aqueous ammonium persulfate solution containing a mass concentration of 0.07%, The surface of the cross-linked polyamide composite reverse osmosis membrane to be grafted was contacted with the above-mentioned initiator solution for 7 minutes, and then the membrane surface was purged with nitrogen until there were no droplets; (HEMA) aqueous solution, contact the surface of the cross-linked polyamide composite reverse osmosis membrane containing the initiator with the above solution for 10 minutes, heat treatment at 75°C to obtain a hydrophilic anti-pollution polyamide compos...

Embodiment 2

[0028] The preparation method of the hydrophilic anti-fouling polyamide composite reverse osmosis membrane is the same as that of Example 1, but the contact time between the surface of the cross-linked polyamide composite reverse osmosis membrane containing the initiator and the monomer solution is 5 minutes.

[0029] The test method is the same as that of Comparative Example 1, and the obtained results are shown in Table 1.

Embodiment 3

[0031] The preparation method of the hydrophilic anti-fouling polyamide composite reverse osmosis membrane is the same as that of Example 1, but the contact time between the surface of the cross-linked polyamide composite reverse osmosis membrane containing the initiator and the monomer solution is 20 minutes.

[0032] The test method is the same as that of Comparative Example 1, and the obtained results are shown in Table 1.

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Abstract

The invention provides a hydrophility anti-pollution polyamide composite reverse osmosis membrane. The hydrophility anti-pollution polyamide composite reverse osmosis membrane comprises a porous supporting layer, a crosslinking polyamide layer and an acrylics or methacrylate structure unit which is grafted to the crosslinking polyamide layer through a free radical polymerization reaction and contains hydrophilic groups. The invention further provides a preparation method of the hydrophility anti-pollution polyamide composite reverse osmosis membrane. A layer of hydrophility molecular brushes are formed on the surface of a polyamide composite membrane through a free radical polymerization grafting method, the grafting density is higher, and the prepared polyamide composite membrane has better hydrophility and pollution resistance. The preparation method is simple, easy to operate, short in process, low in cost and capable of realizing industrial large-scale production.

Description

technical field [0001] The invention relates to a hydrophilic anti-pollution polyamide composite reverse osmosis membrane and a preparation method thereof, belonging to the technical field of water treatment. Background technique [0002] Reverse osmosis membrane separation technology has separation characteristics such as high efficiency, low energy consumption, and high selectivity, and has been widely used in seawater desalination, separation and concentration, drinking water purification, waste water recycling and other fields. Polyamide composite membrane has the advantages of high rejection rate, large flux, excellent chemical stability, wide pH range (4-11), and low operating pressure requirements, and has become the mainstream product in the field of reverse osmosis membranes. However, the application of polyamide composite membranes also has serious membrane fouling problems, especially in the fields of highly polluted water treatment, water reuse, and chemical sepa...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D71/56B01D71/40B01D69/12B01D69/02B01D67/00
CPCB01D69/12B01D71/56B01D69/1214
Inventor 胡群辉路宏伟彭博喻慧贺攀王进刘旦黄涛
Owner HUNAN OVAY TECH CO LTD
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