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Anti-yellowing composite reverse osmosis membrane and preparation method thereof

A technology of reverse osmosis membrane and membrane casting solution, which is applied in the field of separation membranes, can solve the problems of restricting the application and promotion of reverse osmosis membranes, reducing the service life of membranes, and affecting the appearance of membranes, so as to reduce the risk of cortex shedding, high hydrophilicity, The effect of improving hydrophilic performance

Active Publication Date: 2021-08-13
JIANGSU LONGMEM ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The reverse osmosis membrane is formed by interfacial polymerization on the surface of the ultrafiltration membrane. The main problem of the conventional reverse osmosis membrane is that the excess of amino groups and acid chlorides in the interfacial polymerization will cause the membrane surface of the reverse osmosis membrane to turn yellow, and with time The color becomes darker and darker, which reduces the service life of the membrane and affects the appearance of the membrane, which limits the application of reverse osmosis membrane and the promotion in different fields

Method used

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  • Anti-yellowing composite reverse osmosis membrane and preparation method thereof
  • Anti-yellowing composite reverse osmosis membrane and preparation method thereof
  • Anti-yellowing composite reverse osmosis membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The amount of substance was added to IBMA, EGMA and AM of 2: 1: 1 to solvent xylene, and the amount of ultrasonic stirring was mixed at 25 ° C, and the amount of the substance was added to an initiator of 0.005, and the vacuum was taken. The reaction was stirred at 80 ° C for 8 h, and the anti-yellow copolymer particles were obtained by centrifugation.

[0029] 2% of the anti-yellow copolymer particles, 15% PVDF, 1% PVP K30 and 0.5% Tween 85 were added to 81.5% DMAC solution, mixed with mixed stirring at 65 ° C and decorating the cast film. liquid.

[0030] The inverted fluid is uniform in the nonwoven fabric, and the phase separation is performed in ultrapure water by a doctor blade film, and the functional ultrafiltration membrane is obtained.

[0031] The functional ultrafiltration membrane is immersed in aqueous phase solution in aqueous phase solution, wherein each component has a mass percentage of 2% IBMA, 2.5% ammine, 0.15% triethylamine and 0.25% camphor sulfonic a...

Embodiment 2

[0033] In addition to the amount ratio of the substances of IBMA, EGMA, and AM to 3: 2: 1, the other conditions are the same as in Example 1, resulting in anti-yellowing composite reverse osmosis membrane.

Embodiment 3

[0035] In addition to the amount ratio of the substances of IBMA, EGMA, and AM to 1: 2: 2, the other conditions are the same as in Example 1, resulting in anti-yellowing composite reverse osmosis membrane.

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PUM

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Abstract

The invention relates to a preparation method of an anti-yellowing composite reverse osmosis membrane and an application thereof, and the preparation method comprises the following steps: synthesizing poly (ethylene glycol dimethacrylate (EGMA) / isobutoxyacrylamide (IBMA) / acrylamide (AM) ternary anti-yellowing copolymer particles, fixing the ternary anti-yellowing copolymer particles in an ultrafiltration membrane, adding IBMA in the interfacial polymerization process, forming two anti-yellowing layers, and cross-linking IBMA with multi-element acyl chloride or self in interfacial polymerization to form a flexible network, so that the stability of the desalting layer is improved. The test results show that compared with the existing reverse osmosis membrane, the anti-yellowing composite reverse osmosis membrane prepared by the invention has excellent anti-yellowing performance, longer service life and higher flux and desalination performance.

Description

Technical field [0001] The present invention relates to the field of separation membrane, and in particular to a method and application of anti-yellowing composite reverse osmosis membrane. Background technique [0002] Membrane separation technology is currently widely used in a variety of water treatment problems. According to the requirements, it is divided into microfiltration, ultrafiltration, nanofiltration and reverse osmosis. The reverse osmosis membrane is the largest film product in the field of market share and prospects in the field of film separation. [0003] The reverse osmosis membrane is formed by the surface of the ultrafiltration membrane through the interface polymerization process, and the main problem of conventional reverse osmosis membranes in the interface polymerization of the amino and acid chloride can cause the membrane surface of the reverse osmosis membrane to turn yellow, and with the use time The extension, the color of the color, lower the life o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D71/68B01D69/12B01D67/00C02F1/44
CPCB01D69/02B01D71/68B01D69/12B01D67/0006C02F1/441B01D2325/36Y02A20/131
Inventor 沈娟赵宇辰王薇张鹏
Owner JIANGSU LONGMEM ENVIRONMENTAL TECH CO LTD
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