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A kind of preparation method of polybenzimidazole/modified polyepichlorohydrin composite anion exchange membrane

A technology of polyepichlorohydrin and anion exchange membrane, which is applied in the direction of electrochemical generators, fuel cells, electrical components, etc., can solve the problem of ion conductivity decline, limit the wide application of quaternary ammonium salt alkaline anion exchange membranes, and the environment Pollution and other issues, to achieve the effect of reducing hazards, good mechanical properties and chemical stability

Active Publication Date: 2019-06-04
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the yield of chloromethylation reaction is generally low, and chloromethylation reagents, especially chloromethyl ether, have great toxicity. In addition, trimethylamine (TMA) commonly used in the process of quaternization reaction, because of its Very volatile, easy to cause environmental pollution
In addition, this quaternary alkylamine-type anionic membrane, in an alkaline environment due to OH - The nucleophilic substitution reaction and Hoffman elimination reaction caused by the direct attack degrade it, resulting in a decrease in the ionic conductivity of the membrane
These problems have limited the wide application of quaternary ammonium salt basic anion exchange membranes, so the preparation of new alkali-resistant anion exchange membranes is the key to the development of AAEMFC

Method used

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  • A kind of preparation method of polybenzimidazole/modified polyepichlorohydrin composite anion exchange membrane
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  • A kind of preparation method of polybenzimidazole/modified polyepichlorohydrin composite anion exchange membrane

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Embodiment 1

[0023] Preparation of 10% modified polyepichlorohydrin doped PBI composite anion exchange membrane

[0024] (1) Preparation of fluorine-containing polybenzimidazole (PBI) solution

[0025] Stir 27g of polyphosphoric acid PPA at 140°C under the protection of nitrogen until the solid is completely dissolved and deoxidized into a colorless transparent solution and cooled to room temperature; under the protection of nitrogen, add 2.14g of 3,3'-diaminobiphenyl Diamine and 3.92g of 2,2-bis(4-carboxyphenyl)hexafluoropropane, raise the reaction temperature to 100°C, 120°C, and 140°C, and react at each temperature for 12h, 12h, and 6h respectively; After cooling, pour the reaction system into deionized water to precipitate a brown filamentary polymer, soak or wash the polymer to remove excess acid, and obtain fluorine-containing polybenzimidazole polymer after vacuum drying; finally, the obtained fluorine-containing polyphenylene The imidazole polymer is added to dimethyl sulfoxide (D...

Embodiment 2

[0032] Preparation of 20% modified polyepichlorohydrin doped PBI composite anion exchange membrane

[0033] In the control step (3), the mass ratio of modified polyepichlorohydrin to fluorine-containing polybenzimidazole is 2:8, and the rest of the operations are the same as in Example 1.

[0034] The ion conductivity of the anion exchange membrane obtained in this example at room temperature is: 32.04mS cm -1 ; The ionic conductivity at 80°C is: 40.21mS·cm -1 ; Tensile strength: 35.44MPa; Young's modulus: 856.76MPa; Elongation at break: 6.033%.

Embodiment 3

[0036] Preparation of 30% modified polyepichlorohydrin doped PBI composite anion exchange membrane

[0037] In the control step (3), the mass ratio of modified polyepichlorohydrin to fluorine-containing polybenzimidazole is 3:7, and the rest of the operations are the same as in Example 1.

[0038] The ion conductivity of the anion exchange membrane obtained in this example at room temperature is: 39.01mS cm -1 ; The ionic conductivity at 80°C is: 45.74mS·cm -1 ; Tensile strength: 30.29MPa; Young's modulus: 731.67MPa; Elongation at break: 7.370%.

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Abstract

The invention belongs to the field of alkaline fuel cells, and particularly relates to a preparation method of a polybenzimidazole / modified polyepichlorohydrin composite anion-exchange membrane. The preparation method comprises the following steps: after evenly mixing a polybenzimidazole-containing solution with an imidazolium salt modified polyepichlorohydrin solution, evaporating a solvent into a film; and soaking the film in an alkaline solution, and then washing the film to be neutral so as to obtain the composite anion-exchange membrane. The preparation method is simple and efficient, harm to the environment and human bodies is small, and the composite film has good ionic conductivity and stable alkali resistance and mechanical property, and can be applied to the field of alkaline fuel cells.

Description

technical field [0001] The invention belongs to the field of alkaline fuel cells, in particular to a method for preparing a polybenzimidazole / modified polyepichlorohydrin composite anion exchange membrane. Background technique [0002] Alkaline anion exchange membrane (Anion-exchange membrane, AEM) is the core component of Alkaline anion exchange membrane fuel cell (AAEMFC), its role is: (1) to separate the anode and cathode Open, to avoid direct mixing of fuel and air (oxygen) to react; (2) transfer anions from the anode to the cathode to form a loop, etc. Generally, the alkaline anion exchange membrane used in alkaline anion fuel cells needs to meet the following points: (1) better OH - Electrical conductivity; (2) better alkali resistance; (3) better mechanical properties; (4) good thermal stability and so on. [0003] The most studied AEM is the quaternary ammonium anion exchange membrane. Usually, the preparation of this type of basic anion exchange membrane needs to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22C08G73/06C08G65/333C08L79/04C08L71/03H01M8/103H01M8/1069
CPCC08G65/33317C08G73/0677C08J5/2256C08J5/2262C08L71/03C08L79/04C08L2203/16H01M8/103H01M8/1069Y02E60/50
Inventor 储富强王琳琳林本才袁宁一丁建宁
Owner CHANGZHOU UNIV
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