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Method for preparing self-crosslinking polymer anion exchange membrane

An anion exchange membrane and polymer technology, applied in the field of ion exchange membrane, can solve the problems of limiting the application of polymer anion exchange membrane and decreasing the strength, and achieve the effects of excellent mechanical strength, high exchange capacity, simple and efficient reaction

Active Publication Date: 2010-10-20
WUHAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high-temperature alkaline conditions, the strength of common anion-exchange membranes will be greatly reduced if high exchange capacity is to be obtained, which limits the application of polymer anion-exchange membranes in aqueous electrochemical devices.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Dissolve 1 weight unit of polyarylsulfone (PASF) in 5 weight units of 1,2-dichloroethane, add 0.05 weight unit of zinc powder, 0.1 weight unit of trifluoroacetic acid, and then add 1 weight unit of chlorine Methyl ether was stirred at 30°C for 6 hours; the above mixture was poured into methanol to precipitate the product, and the precipitate was washed with water, dried and crushed and dissolved in 20 weight units of N,N-dimethylformamide ( DMF) to obtain the chloromethylation product solution of polyarylsulfone (PASF). Take 1 weight unit of the above-mentioned solution and add 0.01 weight unit of diethylamine, and stir and react at 30° C. for 2 hours. Heating and vaporizing the trimethylamine aqueous solution, passing the trimethylamine gas into the above solution for 5 minutes after drying; drying the above reaction solution at 50°C by casting method to form a film to obtain an anion exchange membrane.

[0015] The solution concentration of the above-mentioned chloro...

Embodiment 2

[0018] Dissolve 1 weight unit of polyarylsulfone (PASF) in 6 weight units of 1,1-dichloroethane, add 0.1 weight unit of aluminum powder, 0.4 weight unit of trifluoromethanesulfonic acid, and then add 3 weight units Chloromethyl ether, stirred at 30°C for 6 hours; the above mixture was poured into ethanol to precipitate the product, the precipitate was washed with water, dried and crushed, and dissolved in 30 weight units of N,N-diethyl ethyl Amide (DMAc) to obtain a solution of the chloromethylated product of polyarylsulfone (PASF). Take 1 weight unit of the above solution and add 0.03 weight unit of dipropylamine, and stir and react at 50° C. for 0.5 hour. Heating and vaporizing the trimethylamine aqueous solution, passing the trimethylamine gas into the above solution for 10 minutes after drying; drying the above reaction solution at 60°C by casting method to form a film to obtain an anion exchange membrane.

[0019] The solution concentration of the above-mentioned chlorom...

Embodiment 3

[0022] Dissolve 1 weight unit of phenolphthalein polyethersulfone (PES-C) in 7 weight units of chloroform, add 0.5 weight unit of zinc powder, 1 weight unit of 3,3,3-trifluoropropionic acid, and then add 5 Chloromethyl ether in units of weight was stirred at 30°C for 6 hours; the above mixture was poured into methanol to precipitate the product, and the precipitate was washed with water, dried and crushed and dissolved in 10 units of N-methylpyrrolidone ( NMP) to obtain the chloromethylation product solution of phenolphthalein type polyethersulfone (PES-C). Take 1 weight unit of the above solution and add 0.05 weight unit of dibutylamine, and stir and react at 10° C. for 8 hours. Heating and vaporizing the trimethylamine aqueous solution, passing the trimethylamine gas into the above solution for 15 minutes after drying; drying the above reaction solution at 80°C by casting method to form a film to obtain an anion exchange membrane.

[0023] The solution concentration of the ...

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Abstract

The invention discloses a method for preparing a self-crosslinking polymer anion exchange membrane, which comprises the following steps of chloromethylation, tertiary amination, quaternization and self-crosslinking membrane forming of a polymer, wherein the tertiary amination comprises the steps of dissolving the product of the chloromethylation of the polymer into a solvent to obtain chloromethylated product solution of the polymer (namely, the tertiary ammonium prepared solution); and adding a little low grade secondary amine into the solution, and then stirring and reacting at room temperature to obtain the chloromethylated tertiary ammonium solution of the polymer (namely, the quaternary ammonium prepared solution). The self-crosslinking reaction of the polymer is performed in the process of membrane forming after the quaternization. The method is simple, convenient and highly efficient; and the obtained anion exchange membrane has high ion exchanged capacity, high chemical property, high heat stability, high mechanism property, high conductivity and excellent performance at a high temperature and under the alkali condition.

Description

technical field [0001] The invention belongs to the technical field of ion exchange membranes. In particular, it relates to a preparation method of a polymer anion exchange membrane. Background technique [0002] Anion exchange membranes are key materials in separation and purification, electrochemical devices, and have been widely used in industrial fields such as water treatment technology, hydrometallurgy, chemical and chemical separation, and alkaline fuel cells. Traditional polymer anion exchange membranes have low thermal and chemical stability, and the quaternary ammonium groups in the polymer are easily degraded under higher temperature or alkaline conditions, resulting in a decrease in ion exchange capacity. (T. Sata, et al., J. Membrane Sci., 1996, 112, 161.) [0003] In addition to thermal and chemical stability requirements, the mechanical properties of polymeric anion exchange membranes, including tensile strength and flexibility, are also key indicators for a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/52C08G75/20C08G65/48C08G75/23C08J5/22
Inventor 庄林潘婧李妍陆君涛
Owner WUHAN UNIV
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