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Homogeneous phase cation exchange film and preparation method thereof

A technology of cation exchange membrane and cross-linking agent, which is applied in the field of homogeneous cation exchange membrane and its preparation, can solve the problems of exchange capacity limitation, environmental pollution, complicated steps, etc., achieve large adjustability, shorten reaction time, and easy operation Effect

Active Publication Date: 2009-01-28
HEFEI CHEMJOY POLYMER MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is complicated in steps, needs to be swollen and washed with organic solvents, and will produce a large amount of pollutants, and because the monomer is absorbed by immersion, there are certain limitations, and the polyvinyl chloride film itself cannot be sulfonated, so the obtained film still semi-homogeneous structure
[0006] The U.S. "Journal of Applied Polymers" (Journal of Applied Polymer, 2006, 100 (3): 2238-2243) reported that brominated polyphenylene ether was sulfonated, and the sulfonated product was dissolved with nitrogen methyl pyrrolidone to obtain a casting solution. Scrape on a glass plate and use dry-wet phase inversion or solvent evaporation to obtain a cation exchange membrane. Although brominated polyphenylene ether can enhance the structure of the membrane, the resulting membrane is still linear, with a large degree of swelling and low exchange capacity. Restricted, especially whether phase inversion film formation or solvent evaporation will produce a large amount of organic waste water or waste gas, causing serious pollution to the environment

Method used

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  • Homogeneous phase cation exchange film and preparation method thereof
  • Homogeneous phase cation exchange film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 3g of methyl brominated polyphenylene ether at room temperature in 10ml of styrene and divinylbenzene mixed monomers with a volume ratio of 9.4:0.6 to obtain a homogeneous solution, then add 0.8g of benzoyl peroxide initiator, and obtain after complete dissolution Uniform coating solution; apply the coating solution on a polyvinyl chloride fabric with a thickness of 0.10mm, polymerize at 70-90°C for 6-8 hours to obtain a base film. Take out the basement membrane, sulfonate the basement membrane at 50° C. in a mixed acid of concentrated sulfuric acid and chlorosulfonic acid in a volume ratio of 1:1 for 1 h, take out the sulfonated basement membrane, and sulfonate the basement membrane at 98%, 40%, and Place in 20% and 5% sulfuric acid for 1 hour respectively, and then soak in 1mol / l NaCl solution for 24-48 hours to convert to Na form. Finally, take it out, wash and dry it with deionized water to obtain the Na-type cation exchange membrane.

[0024] Carry out in...

Embodiment 2

[0027] Using the same operating process as in Example 1, changing the amount of brominated polyphenylene ether to 1 g and the amount of initiator to 0.3 g, a film with a similar structure was obtained, and finally the cation exchange membrane prepared by this embodiment was measured The water content and ion exchange capacity are 22.0% and 1.6mmol / g-dry membrane, respectively, and the membrane resistance is 3.82Ω·cm 2 , the ion mobility number is 0.98. The above test data show that the membrane has good conductivity and high ion selectivity, and can be applied in the field of electrodialysis.

Embodiment 3

[0029] Using the same operation process as in Example 1, the amount of brominated polyphenylene ether was changed to 2g, and the amount of initiator was changed to 0.6g to obtain a membrane with a similar structure. Finally, the cation exchange membrane prepared in this example was measured. The water content and ion exchange capacity are 26.7% and 2.10mmol / g-dry membrane, respectively, and the membrane resistance is 2.78Ω·cm 2 , the ion mobility number is 0.99. The above test data show that the membrane has good conductivity and high ion selectivity, and can be applied in the field of electrodialysis.

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Abstract

The invention relates to a homogeneous cation exchange membrane and a preparation method thereof, the homogeneous cation exchange membrane is characterized in that: cinnamene or / and alkyl cinnamene is taken as a monomer, divinylbenzene is taken as a crosslinking agent, benzoyl peroxide or / and azobisisobutyronitrile is taken as an initiator and bromomethyl or chloracetyl poly 1, 4-dimethyl-2, 6-phenylene oxide are taken as a polymer reinforcing agent to prepare even solution which is coated on a reinforced fabric for polymerization to obtain a base membrane which is then sulfonated in a mixture of concentrated sulphuric acid and chlorosufonic acid to obtain the homogeneous cation exchange membrane. Due to adopting aromatic polymer to produce a functional group by further sulfonation, the cation exchange membrane obtained has high exchange capacity, excellent electrochemical property and even structure. In addition, as the monomer used as the solvent can be polymerized, the preparation method is a green solvent-free technology. The cation exchange membrane series with different structures and functions can be obtained by regulating the content of polymer and crosslinking degree and changing the categories of supporters and the sulfonation condition.

Description

technical field [0001] The invention belongs to the field of membrane technology, in particular to a homogeneous cation exchange membrane prepared by online polymerization and a preparation method thereof. Background technique [0002] Cation 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 cation exchange membranes are more widely used in electrodialysis and proton exchange membranes due to the advantages of chemical bonds between the fixed group and the main body of the membrane phase, uniform structure, and low resistance. [0003] "Journal of the Japanese Chemical Society" (Bull.Chem.Sco.Japan, 1963, 36(4):361-366) reported a method for preparing styrene-type sulfonic acid cation exchange membranes by a slurry method (paste method). The film is composed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D69/10C08J5/22
Inventor 徐铜文吴亮
Owner HEFEI CHEMJOY POLYMER MATERIALS CO LTD
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