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Sulfonated graphene modified perfluorosulfonate ion composite membrane and preparation method thereof

A technology of perfluorosulfonic acid ions and sulfonated graphene, which is applied in the direction of electrochemical generators, fuel cells, electrical components, etc., can solve the problems that it is difficult to make compact and good composite membranes, and achieve large-scale scale The production and process routes are simple and the effect of improving adaptability

Active Publication Date: 2017-04-26
THINKRE MEMBRANE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can realize the continuous production of PTFE porous membrane, it is difficult to make a composite membrane with good density.

Method used

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  • Sulfonated graphene modified perfluorosulfonate ion composite membrane and preparation method thereof
  • Sulfonated graphene modified perfluorosulfonate ion composite membrane and preparation method thereof
  • Sulfonated graphene modified perfluorosulfonate ion composite membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] Fully mix the sulfonated graphene and perfluorosulfonic acid resin solution, the mass percentage of sulfonated graphene in the mixed solution is 5‰; add an appropriate amount of DMF to the above mixed solution, place it in a three-necked flask and heat slowly at 70°C 24 hours to remove most of the water in the membrane solution; then ultrasonically oscillate the above mixture for 2 hours, and then place the mixture in a vacuum drying oven with the initial temperature set at 70°C to remove air bubbles in the membrane solution for later use.

[0029] The expanded polytetrafluoroethylene microporous film with a pore size of 0.01-1.0 μm, a porosity greater than 75%, and a thickness of 10-40 μm is selected as the base membrane. Remove the organic matter on the surface of the expanded polytetrafluoroethylene microporous film, use the normal pressure discharge corona method to treat the surface of the polytetrafluoroethylene microporous film, and then place it on the film-formi...

Embodiment 2

[0034] Fully mix the sulfonated graphene and perfluorosulfonic acid resin solution, the mass percentage of sulfonated graphene in the mixed solution is 10‰; add an appropriate amount of DMF to the above mixed solution, place it in a three-necked flask and heat slowly at 100°C 20h to remove most of the water in the membrane solution; ultrasonically oscillate the above mixed solution for 1h, then place the mixed solution in a vacuum drying oven with the initial temperature set at 100°C to remove air bubbles in the membrane solution, and set aside. The expanded polytetrafluoroethylene microporous film with a pore size of 0.01-1.0 μm, a porosity greater than 70%, and a thickness of 20-25 μm is selected as the base membrane. The expanded polytetrafluoroethylene microporous film is cleaned of organic matter on the surface, and the surface of the expanded polytetrafluoroethylene microporous film is treated by high-voltage discharge microwave method, and then placed on the film-forming...

Embodiment 3

[0036] Fully mix the sulfonated graphene and perfluorosulfonic acid resin solution, the mass percentage of sulfonated graphene in the mixed solution is 3‰; add an appropriate amount of DMF to the above mixed solution, place it in a three-necked flask and heat slowly at 80°C 16h to remove most of the water in the membrane liquid; ultrasonically shake the above mixture for 1.5h, then place the mixture in a vacuum drying oven with the initial temperature set at 90°C to remove air bubbles in the membrane liquid, and set aside. The expanded polytetrafluoroethylene microporous film with a pore size of 0.16 μm, a porosity greater than 80%, and a thickness of 25 μm was selected as the base membrane. Use the high-voltage discharge glow method to treat the surface of the PTFE microporous film, and then place it on the film-forming machine, and the film-forming machine drags the expanded PTFE micropores The film runs on the carrying roller of the film forming machine. The expanded polyte...

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Abstract

The invention provides a preparation method of a sulfonated graphene modified perfluorosulfonate ion composite membrane. According to the ion composite membrane, an expanded PTFE microporous membrane serves as a base membrane. The method comprises the step that the base membrane is soaked in a sulfonated graphene perfluorosulfonate resin solution. Compared with the prior art, through doping of sulfonated graphene, self-discharge caused by permeation of vanadium ions is effectively prevented; meanwhile, the conductivity of the composite membrane is greatly improved compared with a Nafion membrane, and the improvement effect is more remarkable along with raise of temperature. Compared with a proton exchange membrane before sulfonated graphene modification, the maximum power of the composite membrane is increased by 80%.

Description

technical field [0001] The invention belongs to the technical field of functional polymer membrane materials, and relates to an ion composite membrane and a preparation method thereof, more specifically, to a sulfonated graphene-modified perfluorosulfonic acid ion composite membrane and a preparation method thereof. Background technique [0002] Perfluorosulfonic acid ion exchange membrane (PFSIEM) is a perfluoropolymer with a polytetrafluoroethylene structure as the backbone and an enene ether structure with a sulfonate at the end as a side chain. It has good chemical stability, thermal stability and Conductivity is a very good ion exchange carrier, so PFSIEM has been widely used in chlor-alkali ion membranes, fuel cell diaphragms and various electrolytic preparation devices; perfluorosulfonic acid ion exchange resins and their ion membranes are used in electrodialysis, chemical catalysis, Gas separation, gas drying, sewage treatment, seawater desalination and other aspects...

Claims

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Application Information

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IPC IPC(8): C08J9/40C08J7/00C08J7/12H01M8/1023H01M8/1039H01M8/1041H01M8/106H01M8/1069
CPCC08J7/00C08J7/12C08J7/123C08J9/40C08J2327/18C08J2429/10H01M8/1023H01M8/1039H01M8/1041H01M8/106H01M8/1069Y02E60/50
Inventor 杨大伟贺建芸苑会林朱工赵长松康维佳罗锡丹刘振文
Owner THINKRE MEMBRANE MATERIAL
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