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Preparation method of amphoteric ion exchange membrane

A technology of zwitterion and exchange membrane, which is applied in the field of preparation of zwitterion exchange membrane, can solve the problems of incompatibility with large-scale production and high membrane cost, achieve good chemical resistance stability, solve uneven distribution, and reduce costs.

Active Publication Date: 2012-11-21
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This composite membrane shows an ion exchange capacity and conductivity similar to that of Nafion membrane, and has been significantly improved in vanadium ion permeability, but the membrane cost is relatively high and is not suitable for large-scale production

Method used

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  • Preparation method of amphoteric ion exchange membrane
  • Preparation method of amphoteric ion exchange membrane
  • Preparation method of amphoteric ion exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0039] The polyvinylidene fluoride (PVDF) powder with a molecular weight of 430000 was immersed in a dichloromethane solution of 1mol / L styrene (St) and dimethylaminoethyl methacrylate (DMAEMA), and then used 60 Coγ-rays were irradiated at room temperature with an absorbed dose of 35 kGy, and the molar mass ratio of styrene (St) and dimethylaminoethyl methacrylate (DMAEMA) was 1:5. After the irradiation, the homopolymer and unreacted monomers were washed away with toluene and then dried for use.

[0040] Dissolve 2 g of the grafted powder in 100 mL of dimethylformamide solvent. The solution was heated and stirred in a 50°C water bath to obtain a transparent viscous solution. The viscous solution was poured on a flat and clean glass plate, dried at 60°C to form a film, and washed in deionized water. Subsequently, the membrane was immersed in a 0.2 mol / L chlorosulfonic acid dichloromethane solution for 12 hours to introduce a sulfonic acid group with a cation exchange function...

specific Embodiment 2

[0041] Immerse the polyvinylidene fluoride powder with a molecular weight of 430000 into the dichloromethane solution of 1mol / L styrene and dimethylaminoethyl methacrylate, and then use 60 Coγ-rays were irradiated at room temperature with an absorbed dose of 35 kGy, and the molar mass ratio of styrene and dimethylaminoethyl methacrylate was 1:5. After the irradiation, the homopolymer and unreacted monomers were washed away with toluene and then dried for use.

[0042] 2 g of the grafted powder was directly placed in a hot press, and hot pressed for 30 min under the conditions of 190° C. and 8 MPa to obtain a polymer membrane material. Subsequently, the membrane was immersed in a 0.2 mol / L chlorosulfonic acid dichloromethane solution for 12 hours to introduce a sulfonic acid group with a cation exchange function. Finally, the membrane was immersed in 1 mol / L hydrochloric acid aqueous solution for protonation reaction for 12 hours to obtain an amphoteric ion exchange membrane. ...

specific Embodiment 3

[0043] Put the polyvinylidene fluoride powder with a molecular weight of 430000 in the air, use 60 Coγ-rays were irradiated at room temperature with an absorbed dose of 15kGy and stored at -20°C. The irradiated powder was mixed with 1 mol / L monomer solution, and stirred and reacted in a water bath at 60°C for 6 hours, wherein the molar mass ratio of styrene and dimethylaminoethyl methacrylate was 1:5. After the reaction is completed, the homopolymer and unreacted monomers are washed away with toluene and then dried for use.

[0044] 2 g of the grafted powder was dissolved in 100 mL of dimethylformamide solvent, and 0.2 g of silica particles were added. The mixed solution was heated and stirred in a water bath at 50°C to make it uniform. The viscous mixed solution was poured on a flat and clean glass plate, dried at 60°C to form a film, and washed in deionized water. Subsequently, the membrane was immersed in a 0.2 mol / L chlorosulfonic acid dichloromethane solution for 12 ho...

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Abstract

The invention discloses a preparation method of an amphoteric ion exchange membrane and relates to a preparation method of an amphoteric ion exchange membrane for an all-vanadium redox flow battery. According to the scheme, the preparation method comprises the following steps of: performing irradiation grafting on polymer powder poly(vinylidene fluoride); transforming the irradiation-grafted polymer powder into a membrane material; and sulfonating the membrane material, hydrolyzing, introducing a sulfonate radical group with a cationic exchange function, putting the membrane material into a hydrochloric acid aqueous solution for undergoing a protonation reaction and introducing basic nitril with an anion exchange function to obtain the amphoteric ion exchange membrane. In the method, commercial poly(vinylidene fluoride) resin with low price is taken as a raw material, so that the membrane making cost can be lowered; a C-F bond has large bond energy, so that the membrane can keep high chemical stability in a strong acid and high oxidizing electrochemical environment; and meanwhile, the problem of non-uniform distribution of grafted chains of the conventional heterogeneous irradiation-grafted membrane in the vertical direction of the membrane is solved.

Description

technical field [0001] The invention relates to the technical field of electrochemical and polymer functional membrane materials, in particular to a preparation method of an amphoteric ion exchange membrane used in an all-vanadium redox flow battery. Background technique [0002] All-vanadium redox flow battery (VRFB) is an energy storage system that uses vanadium ions in different valence states as the active material of the battery. It has the advantages of high energy storage efficiency, long cycle life, safety, reliability, and low cost. has a good application prospect. Ion exchange membrane material is the core functional component of VRFB, and its main function is to separate the positive and negative electrolytes and conduct protons. In order to improve the energy efficiency of VRFB and prolong its cycle life, the ion-exchange membrane should be able to effectively block the permeation of vanadium ions, and have high proton conductivity and good chemical stability. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/12C08J5/22C08F259/08C08F2/46C08F212/08C08F212/14C08F220/34B29C43/58B01J43/00H01M8/02H01M2/16H01M8/1069H01M8/1072H01M8/1088
CPCY02E60/12Y02E60/50
Inventor 翟茂林马骏彭静李久强
Owner PEKING UNIV
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