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Technique for molding new type proton exchange membrane

A technology of proton exchange membrane and forming process, which is applied in the field of proton exchange membrane batteries, can solve the problems of difficult-to-area composite membranes and difficult-to-mass production of composite membranes, and achieve simple process routes, facilitate large-scale production, and improve service life Effect

Active Publication Date: 2007-10-10
SUNRISE POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can obtain a composite membrane with good density and high strength, it is difficult to obtain a composite membrane with a large area, and it is difficult to realize mass production of composite membranes.

Method used

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  • Technique for molding new type proton exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A mixed solvent of ethanol and water was used to heat and dissolve the waste ion exchange membrane (EW=1100) of the chlor-alkali industry in an autoclave to prepare a 5% perfluorosulfonic acid solution. Using the difference in boiling point, replace other organic alcohol solvents in the prepared 5% perfluorosulfonic acid resin solution with n-propanol solvent, and divide the perfluorosulfonic acid resin solution into two contents of 1% and 5% in the agent replacement According to the ratio of Nafion resin: dimethyl sulfoxide = 1: 1, dimethyl sulfoxide was added to the resin solution of perfluorosulfonic acid, shaken, and set aside. The expanded polytetrafluoroethylene microporous film with a pore size of 0.01 μm to 1.0 μm, a porosity greater than 80%, and a thickness of 10 to 40 μm is selected as the base membrane. After removing the organic matter on the surface of the expanded polytetrafluoroethylene microporous film, it is placed on the film forming machine, and the ...

Embodiment 2

[0030] A mixed solvent of ethanol and water was used to heat and dissolve the waste ion exchange membrane (EW=1100) of the chlor-alkali industry in an autoclave to prepare a 5% perfluorosulfonic acid solution. Using the difference in boiling point, replace other organic alcohol solvents in the prepared 5% perfluorosulfonic acid resin solution with n-propanol solvent, and divide the perfluorosulfonic acid resin solution into two contents of 2% and 5% in the solvent replacement The resin solution of perfluorosulfonic acid, Nafion resin: dimethyl sulfoxide = 1: 3, after adding dimethyl sulfoxide, the film forming process of the device is: the expanded polytetrafluoroethylene micropore is dragged by the film forming machine The film runs on the carrying roller of the film forming machine. The base film is first immersed in a perfluorosulfonic acid resin solution with a concentration of 2%, and dried in a drying oven at 70°C for 8 minutes, so that the internal pores of the base film...

Embodiment 3

[0032]A mixed solvent of n-propanol and water was used to heat and dissolve the chlor-alkali industrial waste ion exchange membrane (EW=1100) in an autoclave to prepare an 8% perfluorosulfonic acid solution. And wherein part of the solution is diluted to 1%, according to Nafion resin: dimethyl sulfoxide=1: 2 ratio, add dimethyl sulfoxide, Nafion resin: silicon dioxide=1: 0.03 ratio, add silica sol, Shake and set aside. The expanded polytetrafluoroethylene microporous film is dragged by the film-forming machine to run on the carrying roller of the film-forming machine. The base film is first immersed in a perfluorosulfonic acid resin solution with a concentration of 1%, and dried in a drying oven at 65°C Dry in the middle for 9 minutes, so that the internal pores of the base film are completely closed, and the dried base film continues to be immersed in a solution with a solution concentration of 8%, and dried in a drying oven at 65°C for 11 minutes, and has been kept at 5% sin...

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Abstract

This invention discloses a process for shaping a novel composite proton exchange membrane. The process comprises: dissolving perfluorosulfonic acid in aqueous solution of low-boiling-point organic alcohol, adding high-boiling-point organic solvent and silica sol to obtain membrane-forming solution, dragging base membrane-expanded PTFE microporous membrane on the carry roller of a membrane-forming machine, soaking the base membrane in the low-concentration resin solution, drying at 40-100 deg.C, soaking in the high-concentration resin solution, drying at 40-100 deg.C, soaking and drying repeatedly until the thickness of the composite membrane reaches the predetermined value, and shaping the composite membrane in a drier at 120-200 deg.C. The process is simple, and suitable for mass production. The obtained composite proton exchange membrane has such advantages as high self-water-generating and water-retaining ability, high environmental adaptability, high strength and size stability, and long service life.

Description

technical field [0001] The invention belongs to the field of proton exchange membrane batteries in fuel cells, and in particular relates to a manufacturing process of perfluorosulfonic acid proton exchange membranes. Background technique [0002] Proton exchange membrane is a key component of proton exchange membrane fuel cells (PEMFCs), which directly affects the performance, life and cost of fuel cells. The proton exchange membrane used in PEMFCs must meet the following conditions: high hydrogen ion conductivity; good chemical and electrochemical stability; low permeability coefficient of reactive gases such as hydrogen and oxygen; dry or wet , the film should have a certain mechanical strength. From its structural composition, it can be divided into perfluorinated proton exchange membrane, partially fluorinated proton exchange membrane and non-fluorinated proton exchange membrane. At present, the product that can be maturely applied is perfluorinated proton exchange memb...

Claims

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Application Information

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IPC IPC(8): C08J5/22C08L101/08
Inventor 侯中军宋书范明平文林治银赵恩介
Owner SUNRISE POWER CO LTD
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