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Homogeneous phase anion-exchange membrane and preparation method thereof

A technology of anion exchange membrane and polymer reinforcing agent, which is applied in the field of homogeneous anion exchange membrane and its preparation, can solve the problems of complex steps, limited exchange capacity, environmental pollution, etc., and achieve good dimensional stability, high strength, and easy scale effect

Active Publication Date: 2011-08-24
HEFEI CHEMJOY POLYMER MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has complicated steps and needs to evaporate organic solvents, which will cause serious pollution to the environment, and because the film is formed in the form of weakly basic pyridinium salts, the exchange capacity is limited.

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 3g of methyl brominated polyphenylene ether in 10ml of a mixed solution of chloromethylated styrene and divinylbenzene with a volume fraction of 6% of divinylbenzene at room temperature, stir well to obtain a uniform solution, and then add 0.8g of peroxide Benzoyl initiator, after being completely dissolved, a uniform coating solution is obtained; the coating solution is coated on a polypropylene fabric with a thickness of 0.10mm, and polymerized at 80°C for 8 hours to obtain a base film; the base film is taken out, and the base film is Soak the membrane in a 10% ammonia solution at room temperature for 24 hours, then quaternize it in a 10% trimethylamine solution for 12 hours, and then immerse it in a 1mol / l NaCl solution to convert it into the Cl form .

[0026] Infrared test is carried out on the base film after the above treatment, the result is: 500-600cm -1 Corresponding to the stretching vibration peak of C-Br in brominated polyphenylene ether, 790-810c...

Embodiment 2

[0029] Using the same operating process as in Example 1, except that the amount of methyl brominated polyphenylene ether was changed to 1 g, and the amount of initiator was changed to 0.3 g, a film with a similar structure was obtained.

[0030] It is measured that the water content and ion exchange capacity of the anion exchange membrane prepared by the present embodiment are 12.4% and 0.91mmol / g-dry film respectively, and the membrane resistance is 16.69Ω·cm 2 , the ion mobility number is 0.83.

Embodiment 3

[0032]Using the same operation process as in Example 1, but changing the amount of methyl brominated polyphenylene ether to 4 g and the amount of initiator to 1.4 g, a film with a similar structure was obtained.

[0033] It is measured that the water content and ion exchange capacity of the anion exchange membrane prepared in this embodiment are 19.9% ​​and 1.53mmol / g-dry film respectively, and the membrane resistance is 2.79Ω·cm 2 , the ion mobility number is 0.96. Experimental data show that the membrane has good conductivity and high anion selectivity, and can be applied in the field of electrodialysis.

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Abstract

The invention discloses a homogeneous anion exchange membrane as well as the preparation method thereof. The invention is characterized in that the homogeneous anion exchange membrane takes chloromethylated styrene, styrene or / and alkyl styrene as monomers, takes divinyl benzene as a cross-linking agent, takes benzoyl peroxide or azobisisobutyronitrile as an initiator, and takes bromomethylation poly (1,4- dimethyl2, 6- phenylene oxide) or chloroacetylized poly (1,4-dimethyl2, 6-phenylene oxide) as a polymer reinforcing agent, so as to prepare a uniform solution which is used for pasting a membrane on reinforced fabrics, and the homogeneous anion exchange membrane can be obtained by pretreating a basal membrane obtained by polymerization and then carrying out quaternary ammoniation. The invention obtains a functional group through adopting aromatic polymer, thereby the obtained anion exchange membrane has high exchange capacity, good electrochemical properties, uniform structure and good heat resistance; the slurry is homogeneous, thereby being easy for pasting; the monomers serving as the solvent can be polymerized, thereby being a green and solvent free process; the polymer content and the cross-linking degree can be adjusted, and the types of the sustainer can be changed, thereby obtaining products with different structural morphologies and functions.

Description

technical field [0001] The invention belongs to the field of membrane technology, in particular to a homogeneous anion exchange membrane and its on-line polymerization and solvent-free preparation method. Background technique [0002] Anion exchange membranes are widely used in electrodialysis, diffusion dialysis, membrane electrolysis, fuel cells, electrochemical sensors, etc., and their development and improvement have always attracted the attention of the theoretical and industrial circles. Homogeneous anion exchange membranes are more widely used in electrodialysis and proton exchange membranes because of the chemical bonds between the fixed groups and the main body of the membrane phase, which have the advantages of uniform structure and low resistance. [0003] Chinese patent ZL 90103412.6 discloses a paste method for preparing anion exchange membranes. The membrane is composed of alkylene acrylates or alkylene oxides (monomers), divinylbenzene, etc. (crosslinking agen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/28B01D69/10C08J5/22B01J41/12B01J41/13
Inventor 徐铜文吴亮
Owner HEFEI CHEMJOY POLYMER MATERIALS CO LTD
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