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Preparation method of pech/pvdf anion exchange membrane based on semi-interpenetrating polymer network

An anion exchange membrane and polymer technology, applied in the field of preparation of PVDF/PECH anion exchange membrane based on semi-interpenetrating network, can solve the problems of easy water absorption, limit the practical application of electrodialysis technology, etc. The effect of suitable ion exchange content

Active Publication Date: 2018-09-11
浙江工业大学上虞研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyepichlorohydrin membrane is easy to absorb water and swell, which limits its practical application in electrodialysis technology.

Method used

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  • Preparation method of pech/pvdf anion exchange membrane based on semi-interpenetrating polymer network
  • Preparation method of pech/pvdf anion exchange membrane based on semi-interpenetrating polymer network
  • Preparation method of pech/pvdf anion exchange membrane based on semi-interpenetrating polymer network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Accurately weigh 1g of polyepichlorohydrin and 0.5g of vinylidene fluoride in 25ml of dimethyl sulfoxide (DMSO), stir at 80°C for 3 h and dissolve to obtain a milky white mixture. Add 0.6 g of triethylenediamine (DABCO) to the resulting mixed solution and stir for 30 min to obtain a light yellow transparent solution. Vacuum defoaming. Then pour it on a clean glass plate and scrape the film with a spatula, and dry it in vacuum at 60°C for 24 hours. The membrane was taken out and soaked in deionized water for a period of time, so that the membrane glass plate fell off naturally, and the membrane was washed with deionized water. Then immerse the obtained membranes in 0.5mol / L, 1mol / L, and 1.5mol / L trimethylamine aqueous solutions respectively, perform quaternization reaction at 25°C for 24 hours, wash repeatedly with deionized water, and finally soak in deionized water For later use.

Embodiment 2

[0028] Accurately weigh 1g of polyepichlorohydrin and 0.75g of vinylidene fluoride in 25ml of dimethyl sulfoxide (DMSO), stir at 80°C for 3 h and dissolve to obtain a milky white mixture. Add 0.6 g of triethylenediamine (DABCO) to the obtained mixed solution and stir for 30 min to obtain a light yellow transparent solution, which is defoamed in vacuum. Then pour it on a clean glass plate and scrape the film with a spatula, and dry it in vacuum at 60°C for 24 hours. Take the membrane out and soak it in deionized water for a period of time to make the membrane fall off naturally on the glass plate, and wash the membrane with deionized water. Then immerse the obtained membrane in 0.5mol / L, 1mol / L, 1.5mol / L trimethylamine aqueous solution, carry out quaternization reaction at 25°C for 24 hours, wash it repeatedly with deionized water, and finally soak it in deionized water spare.

Embodiment 3

[0030] Accurately weigh 1g of polyepichlorohydrin and 1.0g of vinylidene fluoride in 25ml of dimethyl sulfoxide (DMSO), stir at 80°C for 3 h and dissolve to obtain a milky white mixture. Add 0.6 g of triethylenediamine (DABCO) to the obtained mixed solution and stir for 30 min to obtain a light yellow transparent solution, which is defoamed in vacuum. Then pour it on a clean glass plate and scrape the film with a spatula, and dry it in vacuum at 60°C for 24 hours. The membrane was taken out and soaked in deionized water for a period of time, so that the membrane glass plate fell off naturally, and the membrane was washed with deionized water. Then immerse the obtained membrane in 0.5mol / L, 1mol / L, 1.5mol / L trimethylamine aqueous solution, carry out quaternization reaction at 25°C for 24 hours, wash it repeatedly with deionized water, and finally soak it in deionized water spare.

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Abstract

The invention discloses a semi-interpenetrating polymer network-based PECH / PVDF anion-exchange membrane preparation method. The preparation method comprises 1, dissolving polyepichlorohydrin (PECH) and polyvinylidene fluoride (PVDF) in dimethyl sulfoxide (DMSO), heating the solution to a temperature of 65-85 DEG C along with stirring and carrying out stirring for 3-5h, 2, dropwisely adding a cross-linking agent into the mixed solution at a temperature of 60-80 DEG C and stirring the solution for 20-60min to obtain a cross-linked quaternary ammoniated membrane casting solution, 3, carrying out vacuum defoamation on the membrane casting solution, pouring the membrane casting solution on a glass plate, carrying out knife coating through a knife to obtain a membrane, carrying out vacuum drying at a temperature of 50-80 DEG C for 24h, and immersing the glass plate in deionized water for some time so that the membrane naturally falls off from the glass plate, and 4, washing the obtained membrane through deionized water, immersing the membrane in a trimethylamine aqueous solution for quaternary amination for 10-24h and repeatedly cleaning the membrane through deionized water. The preparation method is simple and easy. The prepared membrane has excellent performances and good environmental friendliness.

Description

technical field [0001] The invention relates to the technical field of preparation of anion exchange membranes, in particular to a preparation method based on semi-interpenetrating network PVDF / PECH anion exchange membranes. Background technique [0002] In recent years, technologies related to ion exchange membranes and electrodialysis have developed rapidly, and have been widely used in water treatment, environmental protection, energy and clean production. For the preparation of anion exchange membranes, due to the unavoidable use of strong carcinogens chloromethyl ether and bischloromethyl ether in the halomethylation step in the traditional route, no matter from the aspects of economic cost or environmental protection, the development does not use chloromethyl ether. An anion exchange membrane preparation method with a radicalization step is an urgent need at present. Polyepichlorohydrin (PECH), which contains chloromethyl groups in its side chains, uses polyepichloroh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D71/34B01D71/52B01J41/12
CPCB01D67/0006B01D67/0013B01D71/34B01D71/52B01D2323/30B01D2325/42B01J41/12
Inventor 沈江南韩波杨珊珊周玛丽高从堦
Owner 浙江工业大学上虞研究院有限公司
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