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Homogeneous anion exchange membrane and preparation method thereof

An anion exchange membrane and coating technology are applied in the field of homogeneous anion exchange membrane and its preparation, which can solve the problems of reducing the electrochemical performance of the anion exchange membrane, wasting raw materials, and lacking the driving force for hydrophobic and hydrophilic phase separation.

Active Publication Date: 2015-01-07
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This heterogeneous reaction has the following disadvantages: one, the amount of trimethylamine aqueous solution required to soak the basement membrane is very large, which wastes raw materials and increases the cost; The ammonization reaction has been solidified before, so the driving force for hydrophobic and hydrophilic phase separation is lacking during the introduction of the functional group, that is, the quaternary ammonium group, and the penetrating ion channel cannot be formed in the membrane, which reduces the electrical conductivity of the final anion exchange membrane. Chemical properties, three, trimethylamine is a highly volatile gas with a fishy odor, which has a strong irritating effect on the eyes, nose, throat and respiratory tract of the human body
The above disadvantages have limited the large-scale application of the anion exchange membrane prepared by the above method.

Method used

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

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preparation example Construction

[0034] The invention discloses a method for preparing a homogeneous anion exchange membrane. The method comprises the following steps: dissolving a halomethylated aromatic high polymer in an organic solvent to form a solution to be reacted; mixing the solution to be reacted and The benzimidazole functional small molecules are mixed and undergo nucleophilic substitution reaction to obtain a casting solution of an aromatic polymer with a positively charged benzimidazole functional small molecule side group; and the casting solution A film is coated on a substrate and dried, after which the substrate is removed, or the cast solution is coated on a reinforcing fabric and dried to obtain a homogeneous anion exchange membrane.

[0035] The halomethylated aromatic high polymer is halomethylated polyphenylsulfone, polyethersulfone, bisphenol A polysulfone, polyether ether ketone, polyether ketone, polyphenylene ether, polynaphthyl biphenyl Ether sulfone, polynaphthalene polyether sulf...

Embodiment 1

[0058] The polyethersulfone (halomethyl 0.75mmol) that 1g halomethylation degree is 18mol% is dissolved in 10ml toluene and forms the solution to be reacted that mass volume concentration is 10m / v%, after adding 0.10g 1-methylbenzo Imidazole (0.75 mmol, 1 equivalent) was reacted with stirring at 25°C for 24 hours to obtain a casting solution. Cast the casting solution on a polytetrafluoroethylene plate, heat and dry at 60°C to obtain an anion exchange membrane.

[0059] The prepared anion exchange membrane has uniform and transparent appearance, good mechanical strength and high flexibility of the membrane. Test its related properties: water content 15%, ion exchange capacity 0.60mmolg -1 , with an ionic conductance of 10mS cm -1 , The mechanical strength is 27MPa.

Embodiment 2

[0061] Similar to Example 1, except that the casting solution was scraped on the polyethylene film, heated and dried at 100°C to obtain an anion exchange membrane.

[0062] Since the composition of the membrane liquid is the same, the properties of the anion exchange membrane prepared in this example are similar to those in Example 1.

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Abstract

The invention discloses a homogeneous anion exchange membrane and a preparation method thereof. The method comprises the steps that: a halomethylated aromatic high-polymer is dissolved in an organic solvent, such that a solution requiring reaction is formed; the solution requiring reaction is mixed with benzimidazole functional small molecules; a nucleophilic substitution reaction is carried out, such that a membrane casting solution of aromatic high-polymer containing positively charged benzimidazole functional small molecule pendant groups is obtained; the membrane casting solution is coated on a substrate and is dried, and the substrate is removed; or the membrane casting solution is coated on reinforcement fabric and is dried, such that the homogeneous anion exchange membrane is obtained.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to a homogeneous anion exchange membrane and a preparation method thereof. Background technique [0002] Anion exchange membranes are widely used in diffusion dialysis, electrodialysis, alkaline fuel cells and chemical sensors, etc., and their properties and preparation methods have always attracted the attention of the theoretical and industrial circles. The homogeneous anion exchange membrane has the advantages of uniform structure, low resistance and stable performance due to the characteristics of the fixed ion exchange group in its own structure and the main chain connected by chemical bonds, so it has a wide range of applications in the field of electrodialysis and fuel cells . [0003] The Netherlands "Journal of Membrane Science and Technology" (Journal of Membrane Science, 2001, 190, 159-166) reported a method for preparing an anion exchange membrane by modifying polyphe...

Claims

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Application Information

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IPC IPC(8): C08J5/22C08J7/12C08L81/06C08L61/16C08L71/10C08L71/12B01J41/12H01M2/16H01M8/02B01J41/13
CPCY02E60/50
Inventor 徐铜文林小城
Owner UNIV OF SCI & TECH OF CHINA
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