Method for preparing zwitterion membrane by use of alkaline anion exchange membrane solution and acid cation exchange membrane solution

A zwitterionic and alkaline technology, applied in the field of forming zwitterionic membranes, can solve the problems of product lack of flexibility and film-forming ability, low activity of ethyl bromide, low degree of reaction, etc.

Active Publication Date: 2015-03-25
YANCHENG TEACHERS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material prepared by this method can be applied to adsorb Pb 2+ Ions, but because small molecules have been used for chemical reactions in the preparation process, the activity of -NH-, acid anhydride and ethyl bromide is low, and the degree of reaction is not high, so that the product lacks flexibility and film-forming ability, and can only form brittle irregular shape material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Preparation of acidic cationic membrane solution and zwitterionic membrane by polysilicon copolymer

[0017] (1) Preparation of raw materials:

[0018] 1) Preparation of brominated ammonium polyphenylene ether (QPPO-Br): For the preparation method, refer to the report in Journal of Membrane Science (Journal of Membrane Science, 347, 2010, 240-249). Take 6g of brominated polyphenylene ether with benzyl bromination degree of 53.1% produced by Shandong Tianwei Membrane Co., Ltd., dissolve it in chlorobenzene to form a solution with a concentration of 0.25g / mL, and then add N,N-dimethylformamide (DMF) to form a dilute solution with a concentration of 0.10 g / mL; add 16 mL of a trimethylamine / ethanol solution with a concentration of 0.2 g / mL dropwise to the diluent while stirring, and the time for dropping is 0.5 h. After the dropwise addition, the temperature was raised to 55° C. and the reaction was stirred for 18 hours. The solution was coated on a glass plate,...

Embodiment 2

[0036] Embodiment 2: preparation of zwitterionic membrane with low dosage cross-linking agent and alkaline anion membrane solution

[0037] (1) Raw material preparation: the preparation of QPPO-Br and polysilicon copolymer, and the dissolution of PVA are the same as in Example 1. Another 300 mL of PVA solution with a mass concentration of 5% was added to 200 mL of water to dilute and stir evenly to obtain a solution with a mass concentration of 3%.

[0038] (2) Preparation of alkaline anion solution: heat QPPO-Br at 90°C for 8 hours, take 35g and soak it in 2mol / L NaOH solution for 1 hour, take it out and soak it in distilled water for 2 hours, change the water 8 times during the soaking period, put it into the belt There is a desiccant and vacuumized at room temperature for 1 day, and then dissolved in 80mL DMF and 16mL ethanol to obtain a QPPO-OH solution with a mass concentration of 0.20g / mL, and add 1.49mL tetramethoxysilane to the solution (0.01mol) and 1.87mL phenyltrim...

Embodiment 3

[0044] Example 3: Preparation of acidic cationic membrane solution and zwitterionic membrane using acid-type sulfonated polyphenylene ether (SPPO-H)

[0045] (1) Preparation of raw materials

[0046] 1) The preparation of QPPO-Br was the same as in Example 1; the dissolution of PVA was similar to Example 1, except that 42.4g of PVA was soaked in 960mL of water, heated and stirred to dissolve, and a solution with a mass concentration of 4% was obtained.

[0047] 2) Preparation of SPPO-H solution, soak 20g of Chinese herbal medicine-like sodium sulfonated polyphenylene ether (SPPO-Na, produced by Shandong Tianwei Membrane Technology Co., Ltd.) in 500mL 1mol / L HCl for 2 days, and change HCl once during the period. Then wash with water 6 times within 2 days to remove residual HCl, take it out and place it on a glass plate to ventilate and dry for 3 days, and dissolve it in DMF to form a SPPO-H solution with a mass concentration of 0.20 g / mL.

[0048] (2) Preparation of alkaline a...

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PUM

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Abstract

The invention relates to the technical field of membrane and discloses a method for preparing a zwitterion membrane by use of alkaline anion exchange membrane solution and acid cation exchange membrane solution. The acid cation exchange membrane solution is prepared from polyving alcohol (PVA) and polysilicon copolymer containing -COOH group or acid-type sulfonated polyphenylene oxide containing -SO3 group; the alkaline anion exchange membrane solution is prepared from PVA, alkaline ammonium polyphenylene oxide containing -N+(CH3)3OH- group and micromolecule alkoxyl silane crosslinking agent. The acid cation exchange membrane solution and the alkaline anion exchange membrane solution are blended through pre-sol-gel reaction, so that the acid group (-COOH or -SO3) can be combined with the alkaline group (-N+(CH3)3OH-) to form an ion pair, and a self-assembly structure is formed through combination of ionic bonds, therefore, the zwitterion membrane has a closely-connected ion pair structure and the stability and the separating property of the membrane can be improved.

Description

technical field [0001] The invention belongs to the technical field of membrane preparation, and relates to a method for preparing an amphoteric ion membrane by using an alkaline anion membrane liquid and an acidic anion membrane liquid, specifically forming an amphoteric ion membrane through the ionic bond action of an alkaline group and an acidic group. Background technique [0002] The zwitterionic membrane contains both cation exchange groups and anion exchange groups, and the cation exchange groups are generally -SO 3 - Na + and -COOH, the anion exchange group is generally -N + R 3 x - (X represents halogen). Except for the -COOH group, the other groups do not have obvious acidity or alkalinity. Therefore, in conventional zwitterionic membranes, there are only weak forces such as hydrogen bonds and electrostatic attraction between groups, and the lack of strong ionic bond forces makes it difficult to form a self-assembled structure between ion exchange groups in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/76B01D67/00B01D69/02B01J43/00
Inventor 吴永会蒋苗苗姚娟茆福林
Owner YANCHENG TEACHERS UNIV
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