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Homogeneous anion exchange membrane and preparation method thereof

An anion-exchange membrane and coating technology, applied in the field of homogeneous anion-exchange membranes and their preparation, can solve the problems of wasting trimethylamine aqueous solution, increasing costs, and reducing the electrochemical performance of anion-exchange membranes

Inactive Publication Date: 2012-10-17
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This heterogeneous reaction has the following two disadvantages: one, the amount of trimethylamine aqueous solution used to soak the basement membrane is very large, which causes waste of trimethylamine aqueous solution and increases the cost; two, because the basement membrane is in the It has been solidified before the quaternization reaction with trimethylamine, so the membrane lacks the driving force for hydrophobic and hydrophilic phase separation during the introduction of quaternary ammonium groups, and cannot form a penetrating ion channel in the membrane, which reduces the anion exchange rate of the final preparation. The electrochemical performance of the membrane. In addition, trimethylamine is a highly volatile gas with a fishy odor. It 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

[0036] The invention discloses a method for preparing a homogeneous anion exchange membrane. The method comprises the following steps:

[0037] Dissolving the halomethylated aromatic polymer in an organic solvent to form a solution to be reacted;

[0038] mixing the solution to be reacted with thiazole functional small molecules and performing a nucleophilic substitution reaction to obtain a casting solution of an aromatic polymer with positively charged thiazole functional small molecule side groups; and

[0039] The casting solution is coated on a substrate and dried, after which the substrate is removed, or the casting solution is coated on a reinforcing fabric and dried to obtain a homogeneous anion exchange membrane.

[0040]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 sul...

Embodiment 1

[0063] 1g of polyethersulfone (halomethyl 0.75mmol) with a degree of halomethylation of 18mol% is dissolved in 10ml of toluene to form a solution to be reacted with a mass volume concentration of 10m / v%. After adding 0.074g of 2-methylthiazole ( 0.75mmol, 1 equivalent), stirred and reacted at 25°C for 24h to obtain a casting solution. The casting solution is cast on a polytetrafluoroethylene plate, heated and dried at 60°C to obtain an anion exchange membrane.

[0064] 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 10%, ion exchange capacity 0.65mmolg -1 , with an ionic conductance of 8mS cm -1 , The mechanical strength is 25MPa.

Embodiment 2

[0066] 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.

[0067] 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 thiazole functional small molecules; a nucleophilic substitution reaction is carried out, such that a membrane casting solution of aromatic high-polymer containing positively charged thiazole 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] Since anion exchange membranes are widely used in seawater (brackish water) desalination, tap water dehardening, electrodialysis, diffusion dialysis, electrochemical sensing and fuel cells, their use and development have always attracted people's attention. The homogeneous anion exchange membrane has the advantages of uniform structure, low resistance and stable performance, and has applications in the fields 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 polyphenylene ether. group, soaked in trimethylamine aqueous solution for 48h after film formation to obtain anion exchange membrane. [0004] The...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D67/00B01D69/10B01J41/12B01J41/13
Inventor 徐铜文林小城
Owner UNIV OF SCI & TECH OF CHINA
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