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Construction method of polyamide reverse osmosis composite membrane anti-pollution coating

A technology of reverse osmosis composite membrane and construction method, which is applied in the field of construction of polyamide reverse osmosis composite membrane anti-pollution coating, and can solve the problems of high operation and maintenance costs and weak anti-pollution performance

Pending Publication Date: 2022-03-15
HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned problems existing in the prior art, the purpose of the present invention is to design and provide a technical scheme for the construction method of the polyamide reverse osmosis composite membrane anti-pollution coating, which introduces the amphoteric anti-pollution coating in the form of chemical grafting, While maintaining the original separation performance of the polyamide reverse osmosis composite membrane, especially the permeability performance, it overcomes the defects of its weak anti-pollution performance and high operation and maintenance costs, and improves the anti-pollution performance of the commercialized polyamide reverse osmosis composite membrane. Further expand the application of reverse osmosis technology to provide conditions

Method used

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  • Construction method of polyamide reverse osmosis composite membrane anti-pollution coating
  • Construction method of polyamide reverse osmosis composite membrane anti-pollution coating
  • Construction method of polyamide reverse osmosis composite membrane anti-pollution coating

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Experimental program
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Effect test

Embodiment 1

[0029] S1. Synthesis of zwitterionic functional materials:

[0030] Select 3-allyloxy-2-hydroxyl-1-propanesulfonate sodium and dimethyl diallyl ammonium chloride to mix and prepare an aqueous solution with a total mass concentration of 4.0% in a molar ratio of 1:1, and mix The solution was heated to 60 °C, and then potassium persulfate with the volume concentration of 0.8% was added to react for 5 h to obtain zwitterionic functional materials.

[0031] S2. Grafting of zwitterionic functional materials:

[0032]1) Prepare a glutaraldehyde solution with a mass concentration of 2.5%, and adjust the pH to 3.0;

[0033] 2) Prepare the above zwitterionic functional material into an aqueous solution with a mass concentration of 1.0%, and adjust the pH to 2.5-3.5;

[0034] 3) Soak the polyamide reverse osmosis composite membrane in glutaraldehyde solution for 2 minutes, take it out and wash it with pure water; then soak it in the aqueous solution of zwitterionic functional materials...

Embodiment 2

[0039] S1. Synthesis of zwitterionic functional materials:

[0040] Select 3-allyloxy-2-hydroxyl-1-propanesulfonic acid sodium, allyl (3-aminopropyl) dimethyl ammonium chloride, and mix them in a molar ratio of 1:1 so that the total mass concentration is 4.0 % aqueous solution, and the solution was heated to 60 °C, followed by adding potassium persulfate with the same volume concentration of 0.8% for 5 h to obtain zwitterionic functional materials.

[0041] S2. Grafting of zwitterionic functional materials:

[0042] 1) Prepare a glutaraldehyde solution with a mass concentration of 2.5%, and adjust the pH to 3.0;

[0043] 2) Prepare the above zwitterionic functional material into an aqueous solution with a mass concentration of 1.0%, and adjust the pH to 2.5-3.5;

[0044] 3) Soak the polyamide reverse osmosis composite membrane in glutaraldehyde solution for 2 minutes, take it out and wash it with pure water; then soak it in the aqueous solution of zwitterionic functional mat...

Embodiment 3

[0049] S1. Synthesis of zwitterionic functional materials:

[0050] Select 3-allyloxy-2-hydroxyl-1-propanesulfonate sodium and allyltrimethylammonium chloride to mix and prepare an aqueous solution with a total mass concentration of 4.0% in a molar ratio of 1:1, and mix the solution Heating to 60 °C, followed by adding potassium persulfate with the volume concentration of 0.8% for 5 h to obtain zwitterionic functional materials.

[0051] S2. Grafting of zwitterionic functional materials:

[0052] 1) Prepare a glutaraldehyde solution with a mass concentration of 2.5%, and adjust the pH to 3.0;

[0053] 2) Prepare the above zwitterionic functional material into an aqueous solution with a mass concentration of 1.0%, and adjust the pH to 2.5-3.5;

[0054] 3) Soak the polyamide reverse osmosis composite membrane in glutaraldehyde solution for 2 minutes, take it out and wash it with pure water; then soak it in the aqueous solution of zwitterionic functional materials for 8 minutes...

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Abstract

The invention discloses a construction method of a polyamide reverse osmosis composite membrane anti-pollution coating, and belongs to the technical field of separation membrane preparation. Comprising the following steps: S1, synthesis of a zwitterionic functional material: selecting an olefin anionic monomer and an olefin cationic monomer containing active groups, preparing an aqueous solution, heating, and adding an initiator for reaction to obtain the zwitterionic functional material; s2, grafting of a zwitterionic functional material: sequentially soaking the polyamide reverse osmosis composite membrane in a glutaraldehyde solution and a zwitterionic functional material solution under an acidic condition, and performing heat treatment to complete grafting. According to the construction method of the anti-pollution coating of the polyamide reverse osmosis composite membrane, the thickness of the anti-pollution coating of the composite membrane can be adjusted, the anti-pollution performance of the composite membrane is effectively improved, and meanwhile the construction method has the advantages of being large in coating bonding strength, high in grafting efficiency and the like and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of separation membrane preparation, in particular to a method for constructing an anti-pollution coating of a polyamide reverse osmosis composite membrane. Background technique [0002] The commercial reverse osmosis membrane products currently on the market are mainly prepared from m-phenylenediamine and trimesoyl chloride through interfacial polymerization, and have the characteristics of large permeation flux and high rejection rate of inorganic salts. [0003] However, since the two monomers both contain benzene ring structures, their hydrophilicity is poor; at the same time, the film-forming mechanism of interfacial polymerization makes the separation layer of aromatic polyamide have high roughness and strong negative charge. During the process, it is easy to adsorb pollutants in the feed liquid and cause pollution, which affects the quality and efficiency of the produced water and limits the further ap...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D69/12B01D71/56B01D71/78
CPCB01D61/025B01D71/56B01D71/78B01D69/12B01D67/0093B01D69/02B01D2325/18
Inventor 吕振华丁国良王炎锋邱晖
Owner HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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