Preparation method of modified poly (vinylidene fluoride-co-hexafluoropropylene) grafted vinyl imidazole anion exchange membrane

A technology of anion exchange membrane and vinylidene fluoride, which is applied in anion exchange, ion exchange, chemical instruments and methods, etc., can solve the problems of conductivity and acid concentration performance, and achieve excellent acid concentration performance and low mass loss rate , The effect of simple preparation process

Active Publication Date: 2021-11-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in these two patents, zwitterionic polymers are used to modify polyvinylidene fluoride, and inorganic particles still exist in the modified membrane, which will affect its conductivity and acid concentration performance.

Method used

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  • Preparation method of modified poly (vinylidene fluoride-co-hexafluoropropylene) grafted vinyl imidazole anion exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh 20g of poly(vinylidene fluoride-co-hexafluoropropylene) in a single-necked flask, wherein each gram of poly(vinylidene fluoride-co-hexafluoropropylene) needs N,N-dimethylacetamide 15mL, stirred at room temperature for 10h to obtain a transparent solution A;

[0028] (2) According to the volume ratio of solution A and 0.15mol / L sodium hydroxide isopropanol solution is 10:1, measure 30mL volume of sodium hydroxide alcohol solution and slowly add it to 300mL solution A to prepare solution B. Stir magnetically at room temperature for 1 h to obtain solution C;

[0029] (3) Slowly add solution C to excess deionized water to obtain a brown-red fibrous solid. The above solid was washed with deionized water until neutral, and dried in vacuum at 80°C for 24 hours to obtain solid D;

[0030] (4) Weigh 6g of solid D, 2g of vinylimidazole liquid, and 0.12g of benzoyl peroxide, and dissolve them in 120mL of N-methylpyrrolidone to obtain solution E;

[0031] (5) Heat the ...

Embodiment 2

[0033] (1) Weigh 10g of poly(vinylidene fluoride-co-hexafluoropropylene) in a single-necked flask, wherein each gram of poly(vinylidene fluoride-co-hexafluoropropylene) needs N,N-dimethylacetamide 15mL, stirred at room temperature for 10h to obtain a transparent solution A;

[0034] (2) According to the volume ratio of solution A and 0.15mol / L sodium hydroxide isopropanol solution is 10:1, measure 15mL volume of sodium hydroxide alcohol solution and slowly add it to 150mL solution A to prepare solution B. Stir magnetically at room temperature for 1.5 h to obtain solution C;

[0035] (3) Slowly add solution C to excess deionized water to obtain a brown-red fibrous solid. The above solid was washed with deionized water until neutral, and dried in vacuum at 80°C for 24 hours to obtain solid D;

[0036] (4) Weigh 3g of solid D, 1.5g of vinylimidazole liquid, and 0.03g of benzoyl peroxide, and dissolve them in 60mL of N-methylpyrrolidone to obtain solution E;

[0037] (5) Heat t...

Embodiment 3

[0039] (1) Weigh 10g of poly(vinylidene fluoride-co-hexafluoropropylene) in a single-necked flask, wherein each gram of poly(vinylidene fluoride-co-hexafluoropropylene) needs N,N-dimethylacetamide 15mL, stirred at room temperature for 10h to obtain a transparent solution A;

[0040] (2) According to the volume ratio of solution A and 0.15mol / L sodium hydroxide isopropanol solution of 10:1, take 10mL volume of sodium hydroxide alcohol solution and slowly add it to 150mL solution A to prepare solution B. Stir magnetically at room temperature for 2 h to obtain solution C;

[0041](3) Slowly add solution C to excess deionized water to obtain a brown-red fibrous solid. The above solid was washed with deionized water until neutral, and dried in vacuum at 80°C for 24 hours to obtain solid D;

[0042] (4) Weigh 4.5g of solid D, 2g of vinylimidazole liquid, and 0.09g of benzoyl peroxide, and dissolve them in 90mL of N-methylpyrrolidone to obtain solution E;

[0043] (5) Heat the sol...

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Abstract

The invention discloses a preparation method of a modified poly (vinylidene fluoride-co-hexafluoropropylene) grafted vinyl imidazole anion exchange membrane. The preparation method comprises the following steps: (1) fully stirring poly (vinylidene fluoride-co-hexafluoropropylene) and DMAc in a container to obtain a transparent solution A; (2) slowly adding a strong alkali alcohol solution into the solution A, and stirring to obtain a solution C; (3) slowly adding the solution C into excessive deionized water to obtain a fibrous solid, washing the solid with deionized water until the solid is neutral, and performing vacuum drying to obtain a solid D; (4) dissolving the solid D, vinyl imidazole and benzoyl peroxide in NMP to obtain a solution E; and (5) carrying out heating reaction on the solution E in a nitrogen atmosphere, adding 1, 4-dibromobutane, fully stirring, paving the obtained solution on a clean glass plate, and carrying out vacuum drying to obtain the modified poly (vinylidene fluoride-co-hexafluoropropylene) grafted vinyl imidazole anion exchange membrane. The prepared membrane is excellent in acid concentration performance, good in acid resistance and low in swelling degree.

Description

technical field [0001] The invention relates to a preparation method of a modified poly(vinylidene fluoride-co-hexafluoropropylene) grafted vinylimidazole anion exchange membrane, and belongs to the field of membrane materials used for acid concentration by electrodialysis technology. Background technique [0002] Since the advent of perfluorosulfonic acid membranes, researchers have received extensive attention. DuPont's Nafion membranes have performed well in the market, but the shortcomings of Nafion membranes, such as high water absorption, poor dimensional stability, and high cost, have restricted their commercialization process. Therefore, scholars hope to develop alternative membranes with good performance. [0003] As a partial fluoride, polyvinylidene fluoride (PVDF) has excellent chemical stability and thermal stability, comparable to perfluorinated compounds, and has always been the first choice for membrane materials. Scholars have now used polyvinylidene fluori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08L51/00C08F8/44C08F259/08C08F226/06B01J41/14
CPCC08J5/225C08F8/44B01J41/14C08J2351/00C08F259/08C08F226/06
Inventor 沈江南余帅军缪涵妮郑妍钱豪
Owner ZHEJIANG UNIV OF TECH
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