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Pollution-resistant separation membrane with mixed charge layer on surface and preparation method thereof

A separation membrane, pollution-resistant technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the strict requirements of reaction conditions and equipment, limit the industrial application of modification, and narrow the selection of modified materials, etc. problems, to achieve the effect of wide selection of raw materials, significant pollution resistance, and improved pollution resistance.

Inactive Publication Date: 2018-07-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Zwitterions have been proved to be a kind of anti-fouling surface modification materials with great potential. However, the preparation process of zwitterionic anti-fouling separation membranes often has a narrow range of raw material selection, and the modification method has strict requirements on raw material functional groups, reaction conditions and equipment. , which greatly limits its industrial application in the modification of the separation membrane surface
[0005] Therefore, how to overcome the disadvantages of small selection of modified materials, harsh modification methods, large damage to the membrane surface structure, and complicated and cumbersome operation process while ensuring excellent pollution resistance and stable chemical structure is the key to the realization of pollution-resistant separation membranes. Problems faced in mass production

Method used

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  • Pollution-resistant separation membrane with mixed charge layer on surface and preparation method thereof
  • Pollution-resistant separation membrane with mixed charge layer on surface and preparation method thereof
  • Pollution-resistant separation membrane with mixed charge layer on surface and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] (1) Configure the reaction solution

[0042] Amino compound solution: containing 0.03g / mL hyperbranched polyethyleneimine, 0.0025g / mL EDC and 0.004g / mL NHS;

[0043] Anion / cation compound mixed solution: containing 0.005g / mL 2-acrylamido-2-methyl-1-propanesulfonic acid and 0.005g / mL methacryloyloxyethyltrimethylammonium chloride, and added 0.0003 g / mL of hydroquinone as a polymerization inhibitor.

[0044] (2) Amidation reaction

[0045]Immerse the polyamide reverse osmosis membrane in the amine-based compound solution, and pour it out after reacting for 1 hour at 39°C. The amino group of hyperbranched polyethyleneimine and the carboxyl group on the surface of the reverse osmosis membrane undergo amidation reaction, thereby constructing Base layer with amino groups as Michael addition donors. In order to remove unreacted hyperbranched polyethyleneimine, the modified membrane was shaken in pure water for 1 h.

[0046] (3) Michael addition reaction

[0047] Submerge ...

Embodiment 2

[0053] (1) Configure the reaction solution

[0054] Amino compound solution: containing 0.05g / mL polyethylene polyamine, 0.0025g / mL EDC and 0.004g / mL NHS;

[0055] Anion / cation compound mixed solution: containing 0.005g / mL 2-acrylamido-2-methyl-1-propanesulfonic acid and 0.0043g / mL N-(3-aminopropyl)methacrylamide hydrochloride, And add 0.0003g / mL of hydroquinone as a polymerization inhibitor.

[0056] (2) Amidation reaction

[0057] Immerse the polyamide reverse osmosis membrane in the amine-based compound solution, and pour it out after reacting for 2 hours at 39°C. The amino group of polyethylene polyamine and the carboxyl group on the surface of the reverse osmosis membrane undergo amidation reaction, thereby constructing an amino reaction on the surface of the membrane. layer. In order to remove unreacted polyethylene polyamine, the modified membrane was placed in pure water and shaken for 1 h.

[0058] (3) Michael addition reaction

[0059] Submerge the reverse osmos...

Embodiment 3

[0065] (1) Configure the reaction solution

[0066] Amino compound solution: containing 0.05g / mL tetraethylenepentamine, 0.0025g / mL EDC and 0.004g / mL NHS;

[0067] Anion / cation compound mixed solution: containing 0.005g / mL 3-sulfonic acid propyl methacrylate potassium salt and 0.003g / mL cinnamic amide, and adding 0.0003g / mL hydroquinone as a polymerization inhibitor.

[0068] (2) Amidation reaction

[0069] Immerse the polyamide reverse osmosis membrane in the amine-based compound solution, and pour it out after reacting for 2 hours at 45°C. The amino group of tetraethylenepentamine and the carboxyl group on the surface of the reverse osmosis membrane undergo amidation reaction, thereby constructing an amino reaction on the surface of the membrane. layer. In order to remove unreacted tetraethylenepentamine, the modified membrane was shaken in pure water for 1 h.

[0070] (3) Michael addition reaction

[0071] Submerge the reverse osmosis membrane obtained in step (2) in th...

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Abstract

The invention discloses a pollution-resistant separation membrane with a mixed charge layer on the surface and a preparation method thereof. The surface of the pollution-resistant separation membranecontains an equal number of reverse charged groups at the same time, and the surface of the membrane shows local charge balance. The preparation method comprises the following steps: immersing the separation membrane containing a reaction site on the surface into a mixed solution containing an anionic compound and a cationic compound, and simultaneously grafting the anions and cations onto the surface of the separation membrane through a Michael addition reaction to obtain the pollution-resistant separation membrane with the mixed charge layer on the surface. By the preparation method, the selection ranges of raw materials are wide, the process is simple and mild, designability is strong, industrialization is easy, and the prepared pollution-resistant separation membrane has a significantly improved pollution-resistant effect and is stable in structure.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a pollution-resistant separation membrane with a mixed charge layer on the surface and a preparation method thereof. Background technique [0002] Membrane separation technology, as the "21st century water treatment technology", has the advantages of good water quality, relatively low energy consumption, and low cost. Its application fields have involved seawater desalination, industrial sewage treatment, ultrapure water preparation, medicine and food processing, etc. industry. Separation membrane is the core of membrane separation technology. According to the pore size, it can be divided into four types: reverse osmosis membrane, nanofiltration membrane, ultrafiltration membrane and microfiltration membrane. However, in the actual use process, the pollutants in the raw material liquid, such as suspended particles, colloids, organic matter and microorganisms, are easily adsorb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/02B01D67/00B01D61/02
Inventor 张林林赛赛李银周志军陈圣福李鸽
Owner ZHEJIANG UNIV
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