Perfluoro - resin with ion exchange, and application

A technology of ion exchange and ion exchange capacity, applied in the field of perfluororesin and its application as ion exchange fiber material, to increase the effective area, reduce membrane resistance and cell voltage, and solve technical problems

Inactive Publication Date: 2007-07-25
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Since DuPont processed perfluorosulfonic acid resins into perfluorosulfonic acid ion exchange membranes in the 1970s and this membrane has played a big role in the chlor-alkali industry and proton exchange membrane fuel cells, perfluorosulfonic acid ion exchange membranes have been widely used in countries all over the world. It has been widely studied, but only the "Nafion" type perfluorosulfonic acid resin of DuPont in the United States has been commercialized

Method used

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  • Perfluoro - resin with ion exchange, and application
  • Perfluoro - resin with ion exchange, and application
  • Perfluoro - resin with ion exchange, and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Perfluorosulfonyl vinyl ether (n=2, molecular weight is 612g / mol), molecular formula is:

[0030]

[0031] The synthesis method is as follows:

[0032] Tetrafluoroethylene and liquid SO 3 Reaction to prepare sultone, the purified sultone product is catalyzed by a composite fluoride ion catalyst and reacted with hexafluoroepoxy to prepare a perfluoroacyl fluoride product with a sulfonyl fluoride end group, which has a sulfonyl fluoride end group Perfluoroalkene ether compounds can be prepared by cracking and decarboxylation of perfluoro compounds at high temperature.

Embodiment 2

[0034] Add 23.2g perfluoroalkyl ether containing melamine structure and 185g distilled water as dispersant / solvent in 1L high-pressure stainless steel reaction kettle equipped with stirring, heating and nitrogen feed device, perfluorosulfonyl vinyl ether 5.3g (n =2) and 0.2g of benzoyl peroxide, replace the air in the reactor with high-purity nitrogen, feed 92.8g of tetrafluoroethylene and 1.4g of perfluoromethyl vinyl ether, raise the temperature to 80°C and stir for 3h, and the reaction ends After cooling, deflate to make the pressure inside the kettle become normal pressure, release the product from the discharge pipe, precipitate in a large amount of water, filter to obtain a powder product, wash with distilled water several times, and dry under vacuum at 100°C. Dispersant and water phase, liquid separation and recycling.

[0035] The prepared polymer material perfluororesin shows by fluorine NMR test that the weight percentage of perfluorosulfonyl vinyl ether is 4.89%, th...

Embodiment 3

[0037] Add 23.2g perfluoroalkyl ether containing melamine structure and 185g distilled water as dispersant / solvent in the 1L high-pressure stainless steel reactor that is equipped with stirring, heating, nitrogen feed device, perfluorosulfonyl vinyl ether 6.3g (n =2) and 0.2g of benzoyl peroxide, replace the air in the reactor with high-purity nitrogen, feed 102.8g of tetrafluoroethylene and 1.84g of perfluoropropyl vinyl ether, raise the temperature to 80°C and stir for 3h, and the reaction ends After cooling, deflate to make the pressure inside the kettle become normal pressure, release the product from the discharge pipe, precipitate in a large amount of water, filter to obtain a powder product, wash with distilled water several times, and dry under vacuum at 100°C. Dispersant and water phase, liquid separation and recycling.

[0038] The prepared polymer material perfluororesin shows that its thermal decomposition temperature is 371° C. by DTA test, and its melting tempera...

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Abstract

This invention discloses a perfluoro resin containing sulfonylfluoride groups, which is shown in formula 1. The perfluoro resin has ion exchange function, and is prepared by free radical copolymerization of perfluorosulfonyl vinyl ether, tetrafluoroethylene and alkyl vinyl ether in the presence of dispersant, solvent and initiator. The dispersant / solvent is mixed solution of melamine derivative containing linear perfluoro hydrocarbon and water. The fluorine-containing polymer can be melt-spun into polymer fibers, which can be woven into fiber network that can be used as the reinforcing network material for ion exchange membranes and chlor-alkali ion membrane to reinforce and improve the ion exchange ability.

Description

technical field [0001] The invention relates to the technology of fluorine-containing fine chemicals, and relates to a perfluororesin and its application as an ion exchange fiber material. Background technique [0002] Since DuPont processed perfluorosulfonic acid resins into perfluorosulfonic acid ion exchange membranes in the 1970s and this membrane has played a big role in the chlor-alkali industry and proton exchange membrane fuel cells, perfluorosulfonic acid ion exchange membranes have been widely used in countries all over the world. It has been widely studied, but only the "Nafion" type perfluorosulfonic acid resin of DuPont in the United States has been commercialized. The data provided by the imported ion composite membrane at present shows that there are two types of reinforcing mesh materials used in these membrane materials: polytetrafluoroethylene and meltable polytetrafluoroethylene. These perfluorinated reinforced fabrics are a non-ion exchange function. Ins...

Claims

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Application Information

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IPC IPC(8): C08F214/26D01D5/08C08J5/22
Inventor 高自宏张永明秦胜
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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