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High-performance reverse osmosis composite membrane and preparation method thereof

A reverse osmosis composite membrane, high-performance technology, applied in the field of high-performance reverse osmosis composite membrane and its preparation, can solve the problems of difficult synthesis process, complex chemical structure, difficult to obtain, etc., to reduce the probability of shedding, low membrane cost, The effect of simple structure

Active Publication Date: 2018-05-18
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this technical solution is that the zwitterion in the polyvinyl alcohol grafted zwitterionic polymer is N, N-dimethyl N-(2-methacrylamide oxygen ethyl) N-(2-sulfoethyl) Ammonium or N-(3-sulfopropyl)4-vinylpyridine, which has a complex chemical structure, is difficult to synthesize, and is not readily available

Method used

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  • High-performance reverse osmosis composite membrane and preparation method thereof
  • High-performance reverse osmosis composite membrane and preparation method thereof
  • High-performance reverse osmosis composite membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] Preparation of polyvinyl alcohol grafted zwitterionic copolymer: in 100ml of 10% polyvinyl alcohol aqueous solution, add mass fraction and account for 1% tryptophan, under nitrogen protection conditions, add 0.05mol of DCC (dicyclohexylcarbodiethylene Amine) was used as a redox catalyst, reacted at a temperature of 40°C for 1h, the product was precipitated and washed with methanol, and the obtained solid was dried in an oven at 60°C for 1h to obtain a polyvinyl alcohol grafted zwitterionic copolymer.

[0036] Preparation of polybasic acid chloride: 0.15mol of trichloromethyl carbonate and 0.15mol of Place in a four-necked bottle, add 150ml of ether and stir until dissolved. 1 g of sodium methoxide was added dropwise to the reaction system through a constant pressure separatory funnel, and reacted for 1 h at 0°C. After the reaction finished, the reactant was distilled to remove low-boiling substances; in the gained reactant, the DMF of 50ml and the normal hexane of 50m...

Embodiment 2

[0043] Preparation of polyvinyl alcohol grafted zwitterionic copolymer: in 100ml of 10% polyvinyl alcohol aqueous solution, add mass fraction and account for 20% glutamic acid, under nitrogen protection conditions, add 0.05mol of DCC (dicyclohexylcarbodiethylene Amine) was used as a redox catalyst, reacted at 40°C for 6h, the product was precipitated and washed with methanol, and the obtained solid was dried in an oven at 60°C for 12h to obtain a polyvinyl alcohol grafted zwitterionic copolymer.

[0044] Preparation of polybasic acid chloride: 0.23mol of trichloromethyl carbonate and 0.23mol of Place in a four-necked bottle, add 150ml of acetone and stir until dissolved. 3 g of diethylamine was added dropwise to the reaction system through a constant pressure separatory funnel, and reacted for 15 h at 10° C. After the reaction finished, the reactant was distilled to remove low-boiling substances; in the gained reactant, the DMF of 75ml and the normal hexane of 75ml were adde...

Embodiment 3

[0051] Preparation of polyvinyl alcohol graft zwitterionic copolymer: in the 10% polyvinyl alcohol aqueous solution of 100ml, add the glycine and 16% lysine that mass fraction accounts for 24%, under nitrogen protection condition, add the DCC of 0.05mol (bicyclic Hexylcarbodiimide) was used as a redox catalyst, reacted at a temperature of 40°C for 12h, the product was precipitated and washed with methanol, and the obtained solid was dried in an oven at 60°C for 24h to obtain polyvinyl alcohol grafted zwitterions copolymer.

[0052] Preparation of polybasic acid chloride: 0.3mol of trichloromethyl carbonate and 0.3mol of Place in a four-necked bottle, add 50ml of isopropanol and 100ml of dichloroethane and stir until dissolved. 5 g of 3-methylpyridine was added dropwise to the reaction system through a constant pressure separatory funnel, and reacted for 30 h at 20° C. After the reaction finished, the reactant was distilled to remove low-boiling substances; in the gained rea...

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Abstract

The invention relates to the technical field of reverse osmosis membrane modification, and in particular relates to a high-performance reverse osmosis composite membrane and a preparation method thereof. The preparation method is characterized in that certain polyvinyl alcohol grafted zwitterionic polymer is doped into an aqueous solution involved in the synthesis of a polyamide desalting layer, and certain polyhydric acid chloride is used in an organic phase to change the structure of the polyamide desalting layer, so that the reverse osmosis composite membrane is prepared. The prepared reverse osmosis composite membrane can still maintain stable high-pass water volume and retention rate after a long period of continuous filtration; and at the same time, the reverse osmosis composite membrane also has a strong membrane structure and excellent anti-pollution ability.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membrane modification, in particular to a high-performance reverse osmosis composite membrane and a preparation method thereof. Background technique [0002] Today, with the growing population and the continuous development of industrialization, the pollution and shortage of water resources have become a problem that is paid more and more attention by the public. In order to solve the pollution and shortage of water resources, reverse osmosis membrane water treatment technology came into being. [0003] Reverse osmosis membrane water treatment technology is a method of separating, extracting, purifying, and concentrating component solutes and solvents in a solution according to the different selective permeability of materials. However, in the current practical application, the main problem comes from membrane fouling, which leads to an irreversible decrease in permeation flux due to the ...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D69/12B01D67/00C08F8/30C08F16/06C07C51/58C07C59/68
CPCB01D67/0002B01D69/12B01D71/78C07C51/58C08F8/30C08F16/06C07C59/68
Inventor 王志亮曾焕梁松苗康燕金焱吴宗策
Owner VONTRON TECH CO LTD
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