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Preparation and application of fluororesins with low ion exchange capacity

An ion exchange, fluororesin technology, applied in the direction of ion exchange, cation exchange, electrical components, etc., can solve the problem of mechanical properties, heat resistance, chemical corrosion resistance, durability reduction, fracture, chemical bond position and fracture can not be accurately controlled And other issues

Active Publication Date: 2010-04-14
SHANDONG DONGYUE WEILAI HYDROGEN ENERGY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many research methods use high-energy ray irradiation to functionalize ETFE. One disadvantage of this irradiation method is that the C-C bond on the surface of the film is broken during the irradiation process. Precise control, the mechanical properties, heat resistance, chemical corrosion resistance and durability of the material itself will be reduced

Method used

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  • Preparation and application of fluororesins with low ion exchange capacity
  • Preparation and application of fluororesins with low ion exchange capacity
  • Preparation and application of fluororesins with low ion exchange capacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085]Embodiment 1 (perfluorocarbon solvent system, fluorine-containing organic peroxide is made initiator)

[0086] Polymerization monomers are selected from tetrafluoroethylene and ethylene; vinyl ether monomer: methyl ester group-perfluoropropoxy ethyl isopropyl vinyl ether (molecular formula is CF 2 =CFO-CF 2 (CF 3 ) CFOCF 2 CF 2 COOCH 3 (i.e. n=1, a=2, A=-COOCH 3 ), molecular weight is 422g / mol, preparation reference USP.4578512 preparation)

[0087] Clean and vacuumize the 10L stainless steel autoclave, fill it with high-purity nitrogen and replace it three times until the oxygen content is controlled below 10ppm, vacuumize to -0.1MPa, and add 6L of perfluorocarbon solvent (the perfluorocarbon Solvent is HFC225), 400g carbomethoxy-perfluoropropoxy ethyl isopropyl vinyl ether (molecular formula is CF 2 =CFO-CF 2 (CF 3 ) CFOCF 2 CF 2 COOCH 3 ), stirred and heated up to 40°C, after the temperature of the system was constant, a metering pump was used to add 40ml ...

Embodiment 2

[0093] Embodiment 2: (solution polymerization, fluorocarbon solvent, perfluoroalkyl acyl peroxide initiator)

[0094] Polymerization monomers are selected from tetrafluoroethylene and ethylene; two kinds of vinyl ether monomers (one molecular formula is CF 2 =CFO-CF 2 CF(CF 3 )O-CF 2 CF 2 COOCH 3 (i.e. n=1, a=2, A=-COOCH 3 ), molecular weight 422g / mol, its 2 molecular formula is CF 2 =CFO-CF 2 CF(CF 3 )O-CF 2 CF 2 CF 2 COOCH 3 (i.e. n=1, a=3, A=-COOCH 3 ), molecular weight 472g / mol, carry out solution radical copolymerization.

[0095] The 10L stainless steel autoclave was cleaned and fully dried, then evacuated, filled with nitrogen and replaced three times until the oxygen content was controlled below 10ppm, then evacuated to -0.1MPa, and 6.0L perfluorocarbon solvent (the perfluorocarbon solvent was Perfluorodimethylcyclobutane), 230g of perfluoroalkenyl ether monomer 1 and 250g of perfluoroalkenyl ether monomer 2 were added to the reaction kettle, stirred and ...

Embodiment 3

[0099] Embodiment 3 (suspension polymerization, persulfate is initiator, and water is as dispersion medium)

[0100] Polymerization monomers choose tetrafluoroethylene and ethylene; vinyl ether monomers: CF 2 =CFO-CF 2 CF(CF 3 )O-CF 2 CF 2 COOCH 3 , molecular weight 422g / mol.

[0101] Clean and vacuumize the 10L stainless steel autoclave, fill it with high-purity nitrogen and replace it three times until the oxygen content is below 10ppm, then vacuumize to -0.1MPa, and add 3.2g of perfluoropropoxy ammonium carboxylate ( Molecular formula CF 3 CF 3 CF 2 OCFCF 3 CF 2 -OCFCF 3 COONH 4 ) of pure water 6L, 150g vinyl ether monomer (CF 2 =CFO-CF 2 CF(CF 3 )O-CF 2 CF 2 COOCH 3, molecular weight 422g / mol), heat up to 70°C, feed tetrafluoroethylene, ethylene mixed gas (mixing ratio: tetrafluoroethylene: ethylene = 50: 50) to 4.0MPa, use metering pump to continuously add concentration It is 0.0007mol / L potassium persulfate solution, and the reaction begins. The react...

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Abstract

The invention discloses fluororesins with low ion exchange capacity and high mechanical strength, which comprise tetrafluoroethylene, ethylene and one or pluralities of monomers with structures illustrated by following general formulas (I): in the formulas, a=2-5, n=0-2; A is chosen from -COR0, -COOR1, -CONR2R3 or -CN; and R0-R3 are chosen from -CmH2m+1, wherein m=1-10. Molecular weight ranges from 150,000-650,000. Fluorine-contained polymers with ion exchanging function adopt an anticorrosive hastelloy melt spinning device to prepare polymer fibers with melt spinning serving as materials, the fibers are woven into fiber nets with the ion exchanging function via spinning technology, and the fiber nets serve as strengthening net materials of proton exchange membranes and chlor-alkali ion membranes, thereby achieving the purposes of simultaneously improving the capabilities of membrane materials in strengthening and increasing adhesion between the fibers and the membranes, increasing content of carboxylic acid ions and efficiently stopping back migration of hydroxyls.

Description

technical field [0001] The invention belongs to the field of fluorine-containing polymer materials, and relates to a class of fluorine resin with ion exchange function and its application as an ion exchange membrane reinforcing material. Background technique [0002] Since perfluorinated ion-exchange composite membranes have shown their talents in the chlor-alkali industry, the application of perfluorinated ion-exchange membranes has been extensively studied in countries all over the world. Whether perfluorinated ion exchange membranes are used in the chlor-alkali industry or in fuel cells, the currently known technologies need to be reinforced with reinforcing skeleton materials. Whether they are reinforced with microporous materials or fiber reinforced, these reinforcing materials are nothing more than PTFE. Ethylene, fusible polytetrafluoroethylene and a small amount of sacrificial fiber material for auxiliary purposes. These perfluorinated reinforcing materials are insu...

Claims

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Application Information

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IPC IPC(8): B01J39/18H01M4/94B01J39/19
CPCY02E60/50
Inventor 高自宏秦胜李勇魏茂祥
Owner SHANDONG DONGYUE WEILAI HYDROGEN ENERGY MATERIAL CO LTD
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