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Polymer containing fluorin, and application as material of ion exchange fiber

A fiber material and ion exchange technology, applied in the direction of melt spinning, etc., to achieve the effect of reducing membrane resistance and cell voltage, solving technical problems, and increasing effective area

Inactive Publication Date: 2009-07-29
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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  • Polymer containing fluorin, and application as material of ion exchange fiber
  • Polymer containing fluorin, and application as material of ion exchange fiber
  • Polymer containing fluorin, and application as material of ion exchange fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Preparation of monomer perfluorosulfonyl vinyl ether

[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 in the 1L high-pressure stainless steel reaction kettle that is equipped with stirring, heating, nitrogen feed device as sub-example dispersant / solvent, perfluorosulfonyl vinyl ether 6.12g ( n=2) and 0.2g of benzoyl peroxide, replace the air in the reactor with high-purity nitrogen, pass through 95g of tetrafluoroethylene and 6g of hexafluoropropylene, heat up to 80°C and stir for 6h, cool down after the reaction, and release the gas , make the pressure in 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 was tested by fluorine NMR to show that the weight percentage of perfluorosulfonyl vinyl ether was 5.42%, the ...

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 benzoyl peroxide, replace the air in the reactor with high-purity nitrogen, feed 100.8g tetrafluoroethylene and 4.84g hexafluoropropylene, heat up to 80°C and stir for 3h, cool after the reaction, and put 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 has a thermal decomposition temperature of 374° C. by DTA test, and a melting temperature of 265° C. by DSC test.

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Abstract

The invention discloses a fluorine-containing polymer and its application as ion exchange fiber material. Fluoropolymer is a kind of perfluororesin with sulfonyl fluoride group, which has the structure of formula (I) and has ion exchange function. It is made of perfluorosulfonyl vinyl ether, tetrafluoroethylene and hexafluoropropylene In the presence of dispersants, solvents and initiators, it is prepared by free radical initiated copolymerization. A mixed solution of melamine derivatives containing perfluoroalkane and water is used as a dispersant / solvent. The fluorine-containing polymer is melt-spun by general-purpose melt-spinning equipment to prepare polymer fibers, and the polymer fibers are woven into fiber nets through textile technology, which are used as reinforcing net materials for proton exchange membranes and chlor-alkali ion membranes to achieve reinforcement and simultaneously improve ionic strength. exchange capacity.

Description

technical field [0001] The invention relates to the technology of fluorine-containing fine chemicals, and relates to a fluorine-containing polymer and its application as 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 func...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F14/18C08J5/20C08J5/06D01D5/08
Inventor 张永明高自宏李文薇张恒
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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