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Preparation method of cross-linked anion exchange membrane with low water content

An ion-exchange membrane and cross-linking technology, which is applied in the field of preparation of cross-linked anion-exchange membranes, can solve problems such as high hydrophilicity, swelling, and enhanced membrane surface potential, and achieve high ion exchange capacity and conductivity. The process is simple and the effect of ensuring anti-swelling property

Active Publication Date: 2019-01-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The key to improving the ion-selective permeability and ion conductivity of ion-exchange membranes is to increase the ion-exchange capacity (IEC) of the membrane, but with the increase of IEC, the surface potential of the membrane will be enhanced to bring higher hydrophilicity
This will increase the water content of the ion-exchange membrane, making the membrane prone to swelling and causing a serious decline in mechanical properties, which affects the service life of the ion-exchange membrane

Method used

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  • Preparation method of cross-linked anion exchange membrane with low water content
  • Preparation method of cross-linked anion exchange membrane with low water content
  • Preparation method of cross-linked anion exchange membrane with low water content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) 2 g of BPPO (manufactured by Shandong Tianwei Company, bromomethylation degree is 55%) was dissolved in 10 mL of 1-methyl-2-pyrrolidone, and magnetically stirred until the BPPO was completely dissolved to obtain a brown transparent solution to obtain a BPPO solution.

[0032] (2) Add 0.4 mL of 1-vinylimidazole (manufactured by Shanghai McLean, 97%) dropwise into the BPPO solution, and react with magnetic stirring for 24 hours at 45°C to obtain a quaternized BPPO solution of 1-vinylimidazole .

[0033] (3) In the BPPO solution of quaternization, add 0.204mL of 1,6-hexanedithiol (produced by Shanghai Aladdin Company, 95%) and 0.05g of photoinitiator 2-benzyl-2-dimethyl Amino-1-(4-morpholinephenyl) butanone (manufactured by Shanghai Aladdin Co.), and magnetically stirred until the solution was evenly mixed. Pour the homogeneous solution on a glass plate, use a 600 μm spatula to scrape the glass plate into a film shape, and place it under the ultraviolet light of 345nm...

Embodiment 2

[0037] Change the amount of the cross-linking agent 16-hexanedithiol in the above example 1 to 0.136 mL, and keep the other steps unchanged to obtain the cross-linked anion exchange membrane BPPO-Im0.3.

Embodiment 3

[0039] Change the amount of the cross-linking agent 1,6-hexanedithiol in the above example 1 to 0.272 mL, and keep the other steps unchanged, to obtain the cross-linked anion exchange membrane BPPO-Im0.4.

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Abstract

The invention relates to a preparation method of a cross-linked anion exchange membrane with low water content. The preparation method comprises: (1) adding a solvent 1-methyl-2-pyrrolidone to a bromomethylated polyphenylene oxide solid used as a base film material, mechanically stirring until completely dissolving, adding a quaternization reagent 1-vinyl imidazole to the completely dissolved solution, and mechanically stirring until completely reacting; (2) adding a cross-linking reagent 1,6-hexanedithiol and a photoinitiator to the solution obtained in the step (1), and stirring until forming a uniform solution; and (3) pouring the uniform solution obtained in the step (2) on a glass plate, forming a film on the glass plate in a scraping manner by using a scraping cutter, placing under an ultraviolet lamp, carrying out ultraviolet cross-linking, and heating the glass plate after completing the cross-linking until the solvent is completely volatilized so as to obtain the cross-linkedanion exchange membrane. According to the present invention, with the preparation method, the water content of the anion exchange membrane can be effectively reduced while the anion exchange membranehas the high ion exchange capacity so as to improve the anti-swelling property and the mechanical strength of the membrane.

Description

technical field [0001] The invention belongs to the technical field of anion exchange membranes, and in particular relates to a preparation method of a cross-linked anion exchange membrane with a relatively low water content. Background technique [0002] In recent years, ion exchange membranes have been widely used in many important industrial processes such as membrane reactor cells, fuel cells, chlor-alkali manufacturing, and electrodialysis. As a mature technology, electrodialysis (ED) is widely used in water treatment due to its low cost, high efficiency, convenient operation and environmental friendliness, in addition to its technical potential. As the core of these processes, the ion exchange membrane is composed of a polymer backbone, charged functional groups and exchangeable ions on the functional groups. To meet the requirements of long-term and high-efficiency operation, ion-exchange membranes must not only have high ion-selective permeability and ion conductivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08J3/28C08J3/24C08L71/12
CPCC08J3/24C08J3/28C08J5/2256C08J2371/12
Inventor 沈江南郝亮廖俊斌潘杰锋阮慧敏
Owner ZHEJIANG UNIV OF TECH
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