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Preparation method of polymer anion exchange membrane

An anion exchange membrane and polymer technology, which is applied in the field of preparation of polymer anion exchange membranes, can solve problems such as the decline in mechanical properties, achieve the effects of reducing hazards, simple methods, and improving reaction efficiency

Active Publication Date: 2014-10-08
北京海得利兹新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current polymer anion exchange membranes often have the disadvantage that their mechanical properties decrease significantly when the ion exchange capacity is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1, monomer polymerization: dissolve 1 mol of 4,4'-difluorobenzophenone, 1 mol of o-methylhydroquinone and 1.1 mol of potassium carbonate in 1.75 liters of N-methylpyrrolidone and 850 ml A solution to be reacted was formed in a mixed solvent of toluene, and the solution to be reacted was stirred and reacted at a temperature of 140°C for 0.5h, then the reaction temperature was raised to 170°C and then stirred for 4h, and then the high-temperature reaction mixture after the reaction was completed Cool to room temperature, dilute with 4 liters of tetrahydrofuran, filter, add 100 ml of acetic acid to the filtered mixture, pour it into methanol, wait for a white massive precipitate to precipitate, filter the precipitated white massive precipitate, and use A large amount of methanol is boiled and washed twice and then vacuum-dried to obtain a powdery polymer containing methyl;

[0022] Step 2, bromination of polymer: 1mol of methyl-containing polymer, 0.5mol of bromosucci...

Embodiment 2

[0032] Step 1, monomer polymerization: Dissolve 1mol of 4,4'-difluorobenzophenone, 1mol of 2,4-dimethyl-1,4-benzenediol and 1.2mol of potassium carbonate in 2 liters of A solution to be reacted was formed in a mixed solvent of N-methylpyrrolidone and 800 ml of toluene, and the solution to be reacted was stirred and reacted at 150° C. for 2 hours, then the reaction temperature was raised to 190° C. and then stirred for 6 hours, and then After the reaction, the high-temperature reaction mixture was cooled to room temperature, diluted with 6 liters of tetrahydrofuran, filtered, and 110 ml of acetic acid was added to the filtered mixture and then poured into methanol until a white massive precipitate was precipitated, and the precipitated white After the massive precipitate is filtered out, it is boiled and washed twice with a large amount of methanol, and then vacuum-dried to obtain a powdery polymer containing methyl;

[0033] Step 2, bromination of polymer: 1mol of methyl-conta...

Embodiment 3

[0043] Step 1, monomer polymerization: Dissolve 1mol of 4,4'-difluorobenzophenone, 1mol of 2,6-dimethyl-1,4-benzenediol and 1.15mol of potassium carbonate in 2.5 liters of A solution to be reacted was formed in a mixed solvent of N-methylpyrrolidone and 900 ml of toluene, and the solution to be reacted was stirred and reacted for 2 hours at a temperature of 145° C., then raised to 180° C. and stirred for 5 hours, and then After the reaction, the high-temperature reaction mixture was cooled to room temperature, diluted with 5 liters of tetrahydrofuran, filtered, and 90 ml of acetic acid was added to the filtered mixture and then poured into methanol until a white massive precipitate was precipitated, and the precipitated white After the massive precipitate is filtered out, it is boiled and washed twice with a large amount of methanol, and then vacuum-dried to obtain a powdery polymer containing methyl;

[0044] Step 2, bromination of polymer: 1mol of methyl-containing polymer, ...

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Abstract

The invention discloses a preparation method of a polymer anion exchange membrane. The method comprises the following steps: 4,4'-difluoro benzophenone, hydroquinone with one or more methyl groups or a derivative of hydroquinone with one or more methyl groups, and alkali metal carbonate with a mass ratio of 1:1:1.1-1.2 are dissolved in a mixed solvent of N-methylpyrrolidone and toluene; the mixture is subjected to a reaction under high temperature, such that a polymer containing methyl group is obtained; the polymer with methyl group, bromosuccinimide and an initiator with a mass ratio of 1:0.5-0.8:0.01-0.015 are dissolved in chloroform; heating and reflux suction filtration are carried out; a mixture obtained after suction filtration is added into a precipitating agent, and precipitation is carried out, such that a brominated polymer is obtained; the brominated polymer is subjected to a quaternization treatment and is cast into a membrane; and the membrane is heated and dried, such that the polymer anion exchange membrane is obtained. The method is simple and highly efficient. The obtained polymer anion exchange membrane has high ion exchange capacity, high chemical stability, high thermal stability, and excellent mechanical properties.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a preparation method of a polymer anion exchange membrane. Background technique [0002] Anion-exchange membranes have been widely used in various industrial fields, such as electrolysis to concentrate or desalinate salt solutions as diaphragms for electrolyte electrolysis in the chlor-alkali industry, acid recovery from waste acids, as anion-selective electrodes, as battery diaphragms, etc. 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. 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 applications. The current polymer anion ex...

Claims

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Application Information

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IPC IPC(8): C08J5/22C08L71/10C08G65/48C08G65/40
Inventor 相艳司江菊卢善富徐鑫彭思侃修瑞杰
Owner 北京海得利兹新技术有限公司
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