Proton exchange membrane and preparation method thereof

A technology of proton exchange membrane and quality, applied in fuel cells, electrical components, electrochemical generators, etc., can solve the problems of reducing membrane conductivity, reducing cathode efficiency, fuel waste, etc., and achieves good compatibility and good mechanical strength , better than the effect of preparation

Active Publication Date: 2010-07-07
ENN SCI & TECH DEV
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] However, the perfluorosulfonic acid proton exchange membrane also has the following disadvantages: First, the production process is complicated and the product is expensive, such as Nafion The price of series film is as high as 500~800$ / m 2 ;Secondly, the proton conductivity of perfluorosulfonic acid proton exchange membrane strongly depends on the water content in the membrane. In the case of low water content or high temperature (> 80 ℃) and no water supplement, the proton conductivity will be obvious. the fall of; again, Nafion When the membrane is used in direct methanol fuel cells (DMFC), the phenomenon of methanol permeation is serious, and methanol permeation will cause fuel waste, reduce the conductivity of the membrane, poison the cathode catalyst and reduce the cathode efficiency. Application fields and occasions of exchange membrane
Therefore, the molar ratio of sulfonated monomers that can be used in PBPSH polyethersulfone proton exchange membrane materials under high temperature conditions should not exceed 0.4, and the proton conductivity of PBPSH membranes under this condition is similar to that of Nafion Membrane has no obvious advantage over

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  • Proton exchange membrane and preparation method thereof
  • Proton exchange membrane and preparation method thereof
  • Proton exchange membrane and preparation method thereof

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preparation example Construction

[0026] The preparation method of SPEEK is shown in Scheme 1. According to the mass calculation, weigh 1 part of PEEK (commercial product, model: VICTREX 450P) in 20 to 100 parts of 98% concentrated sulfuric acid, and stir vigorously at room temperature to 60 ° C for 2 ~ After 24 hours, the product is poured into a large amount of water for precipitation to obtain SPEEK with a sulfonation degree of 60-100%.

[0027]

[0028] Scheme 1 PEEK sulfonation reaction to prepare SPEEK

[0029] The preparation of PBPSH with a sulfonation degree of 0-60% is divided into 3 steps: 1) As shown in scheme 2, according to the number of moles, weigh 1 part of dichlorodiphenyl sulfone (DCDPS) monomer and add 1-5 In 20-30% oleum, pour it into ice water after reacting for 2-6 hours, add a large amount of sodium chloride to precipitate sulfonated dichlorodiphenyl sulfone (SDCDPS), and use sodium hydroxide to dissolve SDCDPS before polycondensation reaction. Convert to sodium salt type SDCDPS; 2)...

Embodiment 1

[0047] (1) Dissolve 6 grams of PEEK solid in 300 grams of 98% concentrated sulfuric acid, stir vigorously at 60°C, react for 7 hours, pour the product into a large amount of pure water to obtain a fibrous precipitate, and wash it repeatedly with pure water After the aqueous solution became neutral, it was air-dried at 80° C. for 24 hours to obtain a golden yellow SPEEK fibrous solid with a sulfonation degree of about 90%.

[0048] (2) Dissolve 28.7 grams of DCDPS white powder in 60 mL of 30% oleum, react at 110° C. for 6 hours, and pour the product into 400 mL of ice water after cooling to room temperature. Then add 180 grams of sodium chloride to precipitate a white powdery precipitate, filter and dissolve the precipitate in 400 mL of pure water, adjust the pH value to 6-7 with 2M aqueous sodium hydroxide solution, then add 180 grams of sodium chloride to precipitate white SDCDPS Powdery precipitate, after filtration, the precipitate was vacuum-dried at 120° C. for 48 hours t...

Embodiment 2

[0057] Prepare SPEEK and PBPSNa with the preparation method identical with embodiment 1, and prepare blend membrane with the method identical with embodiment 1, prepared blend membrane contains the SPEEK that sulfonation degree is 90% and sulfonation degree is 35% PBPSH, the difference is that the blending mass ratio of the two SPEEK accounted for 30%.

[0058] The proton exchange membrane mechanical property and proton conductivity that the present embodiment makes are as shown in table 2:

[0059] Table 2 SPEEK film, PBPSH film, blend film and Nafion of Example 2 115 film performance comparison a

[0060]

[0061] Note: a Proton conductivity is tested in pure water environment; b The film was dissolved in hot water at 80°C.

[0062] It can be seen from Table 2 that due to the low proportion of SPEEK in the blended membrane, the performance of the blended membrane is similar to that of the PBPSH membrane. The membrane has excellent thermal stability and chemical sta...

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Abstract

The invention provides a proton exchange membrane with excellent proton conductivity, high mechanical strength, high stability and low cost and a preparation method thereof. The proton exchange membrane is prepared from a blend of sulfonated polyether ether ketone with more than 60 percent and less than 100 percent of sulfonation degree and SPES with more than 0 percent and less than 60 percent of sulfonation degree, wherein the the proportion of sulfonated polyether ether ketone in the blend is between 30 and 50 weight percent; and the proportion of SPES in the blend is between 50 and 70 weight percent.

Description

technical field [0001] The invention relates to a proton exchange membrane and a preparation method thereof. Background technique [0002] Perfluorosulfonic acid proton exchange membranes are currently widely used commercial proton exchange membranes, the most representative of which is Nafion produced by DuPont in the United States. series film. Perfluorosulfonic acid-type proton exchange membrane has the advantages of high mechanical strength, good chemical stability, and high proton conductivity when the water content is high, and is widely used in proton exchange membrane fuel cells, proton exchange membrane electrolysis of water and ion membrane electrolyzer for caustic soda production . [0003] However, the perfluorosulfonic acid proton exchange membrane also has the following disadvantages: First, the production process is complicated and the product is expensive, such as Nafion The price of series film is as high as 500~800$ / m 2 ;Secondly, the proton conductiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M2/16C08L61/16C08L81/06C08J5/22H01M8/1018H01M8/1069
CPCY02E60/12Y02E60/50
Inventor 蔡彦徐世义崔婧张帆胡利彦吕彩玲
Owner ENN SCI & TECH DEV
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