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Homogeneous-phase anion-exchange membrane and preparation method thereof

An anion-exchange membrane and membrane liquid technology, applied in the field of homogeneous anion-exchange membrane and its preparation, can solve problems such as complex steps, environmental pollution, ion exchange capacity loss, etc., and achieve improved comprehensive performance, high mechanical strength, and enhanced dimensional stability sexual effect

Active Publication Date: 2016-08-31
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has complicated steps and requires the evaporation of organic solvents, which will cause serious pollution to the environment, and because this cross-linked structure is formed by adding a cross-linking agent later, it will cause a certain degree of loss of ion exchange capacity.

Method used

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  • Homogeneous-phase anion-exchange membrane and preparation method thereof
  • Homogeneous-phase anion-exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 1 g of bromomethylated poly(1,4-dimethyl 2,6-phenylene oxide) (BPPO) in a mixed solution consisting of 0.25 mL of p-chloromethyl styrene and 1.8 mL of styrene at room temperature. Stir to obtain a uniform solution; add 0.35mL vinylimidazole dropwise to the uniform solution, stir until the solution is uniform, then add 0.075mL methimidazole dropwise, after stirring evenly, apply the film solution evenly on the coating plate, at 100 After drying at ℃ for 12 hours, a film was formed to obtain a homogeneous anion exchange membrane.

[0026] The homogeneous anion exchange membrane that present embodiment obtains is carried out infrared test, and the result is: 1653cm -1 and 1604cm -1 The characteristic peak corresponding to the double bond in the structure, 2923cm -1 and 2960cm -1 Respectively correspond to -CH 2 -and-CH 3 The vibration peak of , 3060cm -1 It is the characteristic peak of -N=C-H on the imidazole group, which proves the occurrence of quaterniza...

Embodiment 2

[0029] This example adopts the same operation process as Example 1, the only difference is that the amount of p-chloromethylstyrene is increased to 0.5mL, and then the amount of vinylimidazole and methylimidazole is adjusted to 0.45mL and 0.15mL respectively, to obtain Structurally similar homogeneous anion exchange membranes.

[0030] After testing, the water content and ion exchange capacity of the anion exchange membrane prepared in this example are 64.1% and 2.14mmol / g-dry film respectively, the ion transfer number is 0.93, and the membrane resistance is 1.12Ω·cm 2 . Experimental data show that the membrane has good conductivity and high anion selectivity, and can be used in the field of electrodialysis.

Embodiment 3

[0032] This example adopts the same operation process as Example 1, the only difference is that the dosage of p-chloromethylstyrene is increased to 0.75mL, and then the dosage of vinylimidazole and methylimidazole is adjusted to 0.53mL and 0.23mL respectively, to obtain Structurally similar homogeneous anion exchange membranes.

[0033] After testing, the water content and ion exchange capacity of the anion exchange membrane prepared in this example are 77.5% and 2.3mmol / g-dry film respectively, the ion migration number is 0.95, and the membrane resistance is 1.12Ω·cm 2 . Experimental data show that the membrane has good conductivity and high anion selectivity, and can be used in the field of electrodialysis.

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Abstract

The invention discloses a homogeneous-phase anion-exchange membrane and a preparation method thereof. The preparation method is characterized by including: dissolving a macromolecule enhancer into a mixed solution of p-chloromethyl styrene and styrene, sequentially adding imidazole micro-molecules with terminal alkenyl and imidazole micro-molecules without terminal alkenyl, and evenly stirring to obtain quaternary ammoniated membrane liquid; coating the membrane liquid of a membrane coating plate, and heating for curing to obtain the anion-exchange membrane. The preparation method has the advantages that the method is simple to operate, fast and safe; the prepared membrane is stable in homogeneous-phase performance, high in ion exchange capacity, high in mechanical strength, good in toughness, capable of being developed in a serial manner and satisfying the requirements of different application fields, and the like.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a homogeneous anion exchange membrane and a preparation method thereof. Background technique [0002] Anion-exchange membranes are widely used in electrodialysis, diffusion dialysis, membrane electrolysis, fuel cells, and chemical sensors. The optimization and upgrading of their performance has always attracted the attention of the industrial field. Among them, electrodialysis technology has been widely used in water desalination and recovery of useful substances from industrial wastewater. However, anion exchange membrane, as its key component, still faces the problem of performance improvement, such as high ion selective permeability and stability. [0003] A preparation method of a cross-linked anion exchange membrane reported in the Netherlands "Energy Journal" (Journal of Power Sources, 233,2013,259-268), in which polyaryletherketone is dissolved in divinylbenz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/30B01D69/02B01D67/00
CPCB01D67/0013B01D69/02B01D71/30B01D2325/42
Inventor 徐铜文吴亮潘麒
Owner UNIV OF SCI & TECH OF CHINA
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