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A perfluorinated ionic resin

A technology of perfluorinated ions and resins, which is applied in the field of ion polymers, can solve the problems of thermal stability and corrosion resistance decline, ion exchange capacity reduction, and influence on electrical conductivity, etc., and achieve good thermal stability and corrosion resistance. The effect of mechanical strength

Active Publication Date: 2021-03-19
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent US20050228061 by adding an appropriate amount of cross-linking monomer R 1 R 2 C=CH(CF 2 ) m CH=CR 5 R 6 To improve the mechanical strength, but due to the introduction of more hydrogen-carbon bonds, the thermal stability and corrosion resistance are reduced
Patent CN201511010319.3 generates a sulfonamide group (-SO 2 NH 2 ) to make a perfluorosulfonamide resin, and use the resin as a modifying agent to add an appropriate amount into the perfluorosulfonic acid resin, which will form a cross-linked structure in the alkali treatment process after film formation, thereby improving the strength of the film; but Due to the use of sulfonic acid groups as cross-linking points will affect the conductivity, resulting in reduced ion exchange capacity
[0005] Patent CN200710013128.1 adopts formula CF 2 =CFO(CF 2 CF(CF 3 )O) a (CF 2 ) b OR (where a is an integer from 0 to 3, b is an integer from 1 to 6, R is C x h 2x+1 The modified monomer represented by the hydrocarbon group) is used to solve the contradiction between mechanical strength and exchange capacity, but the introduction of R also causes the decline of thermal stability and corrosion resistance

Method used

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  • A perfluorinated ionic resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Replace the 5L stainless steel reactor equipped with stirring, temperature control components, explosion-proof components, and nitrogen pipelines with high-purity nitrogen, and use vacuum as the polymerization medium 2500g of perfluorocyclic ether, 350g of sulfonyl fluoride monomer A1, and all 30g of fluoropolyether monomer B2 and 4g of initiator benzoyl peroxide were pumped into the reactor, and then 135g of tetrafluoroethylene was introduced, and the temperature was raised to 75°C with stirring, and then the reactor was kept at 1.2-1.5MPa. Continue to feed 285g of tetrafluoroethylene, keep warm and react until the pressure in the kettle no longer decreases, then cool down to stop the reaction. After the pressure is released, the material is discharged, the material is transferred to a distillation device, and the volatile components are evaporated to obtain a powder product, which is then washed with ethanol three times and dried to obtain the perfluoroionic resin of t...

Embodiment 2

[0045] Except that the perfluoropolyether monomer was replaced by B1, the others were the same as in Example 1.

[0046] DTA test resin decomposition temperature (T d ) is 371°C; the exchange capacity IEC of the resin measured by acid-base titration is 1.27mmol / g; after the above resin is made into an ionic membrane with a film thickness of 120 microns, the membrane is measured according to the method in the national standard GB / T 16579.2 The tear resistance is 43N.

Embodiment 3

[0048] Except that the perfluoropolyether monomer is replaced by B3, the others are the same as in Example 1.

[0049] DTA test resin decomposition temperature (T d ) is 372°C; the exchange capacity IEC of the resin measured by acid-base titration is 1.21mmol / g; after the above resin is made into an ionic membrane with a film thickness of 120 microns, the membrane is measured according to the method in the national standard GB / T 16579.2 The tear resistance is 46N.

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Abstract

The invention discloses perfluor ionic resin. The perfluor ionic resin at least comprises a structure unit of tetrafluoroethylene monomers, a structure unit of sulfuryl fluoride monomers and a structure unit of perfluoropolyether monomers; the perfluoropolyether monomers can be shown by formula PFPE-(CF2-OCF=CF2) alpha, wherein alpha is an integer of 1 or 2, PFPE is perfluoropolyether obtained byoxidation of tetrafluoroethylene radicals, and the number-average molar mass of the perfluoropolyether monomers is 500 or above. The perfluor ionic resin is obtained by modifying the perfluoropolyether monomers which is derived from tetrafluoroethylene, an ionic exchange film prepared from the resin can keep excellent mechanical strength even if the capacity is high, and the prepared ionic exchange film is good in heat stability and corrosion resistance.

Description

technical field [0001] The invention relates to a perfluorinated ionic resin, especially a sulfonic acid ionic resin, belonging to the technical field of ionic polymers. Background technique [0002] In the 1960s, DuPont first synthesized perfluorosulfonic acid resin, and in the 1970s, after successfully developing perfluorosulfonic acid ion exchange membranes for the chlor-alkali industry, perfluorosulfonic acid ion exchange membranes have been widely used in countries all over the world. Attention, and invested a lot of research and development work. [0003] It is well known to use ion exchange membranes in batteries, which can divide an electrolytic cell into a cathode compartment and an anode compartment through which ions can selectively pass. Due to its unique stability, degradation resistance and insoluble properties, perfluorinated ion-exchange membranes are ideal products for battery separators, especially perfluorinated ion-exchange membranes containing sulfonic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F216/14C08F216/18C08F216/12C08F214/26C08F214/28
CPCC08F216/14C08F216/1475C08F216/18C08F214/262C08F216/125C08F214/282
Inventor 裴金东李建高艳林汪星平
Owner JUHUA GROUP TECH CENT
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