Preparation methods of novel cross-linking agent and cross-linked polybenzimidazole proton exchange membrane

A technology of polybenzimidazole membrane and proton exchange membrane, which is applied in the field of fuel cell membrane electrode assembly, can solve the problems of unsuitability for industrialization and inability to prepare cross-linked membranes, and achieve simple cross-linking process, improved mechanical properties and oxidation stability Effect

Inactive Publication Date: 2019-08-27
EAST CHINA UNIV OF SCI & TECH +1
View PDF1 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is limited to laboratory preparation methods and is not suitable for industrialization, because crosslinking needs to be prepared and used immediately, and crosslinking reactions will also occur after the crosslinking agent and polymer blend solution are left to stand for a long time. making it impossible to prepare cross-linked membranes

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation methods of novel cross-linking agent and cross-linked polybenzimidazole proton exchange membrane
  • Preparation methods of novel cross-linking agent and cross-linked polybenzimidazole proton exchange membrane
  • Preparation methods of novel cross-linking agent and cross-linked polybenzimidazole proton exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] First 2.14g tetraaminobiphenyl and 16.0g phosphorus pentoxide and 50.0g polyphosphoric acid are added in the there-necked flask with stirring and condensing reflux device, N 2 In the atmosphere, stir at 140°C for 5 hours, add 4.58g of methyl bromomethylbenzoate, after stirring for 1 hour, the solution turns from brown to green, add deionized water to the mixed solution, a yellow-green solid precipitates, filter the solid The precipitate was washed and dried to obtain a crosslinking agent. Add the cross-linking agent into N,N-dimethylformamide, reflux for 3 hours, and filter to obtain a clear cross-linking agent solution. Soak the polybenzimidazole film in the above cross-linking agent solution at a temperature of 60° C., take it out after soaking for 3 hours, wash it, and dry it to obtain a cross-linked polybenzimidazole film.

Embodiment 2

[0039] First 2.14g tetraaminobiphenyl and 48.0g phosphorus pentoxide and 60.0g polyphosphoric acid are added in the there-necked flask with stirring and condensing reflux device, N 2 In the atmosphere, stir at 160°C for 10 h, add 2.29 g of methyl bromomethylbenzoate, and stir for 2 h, the solution turns from brown to green, add deionized water to the mixed solution, a yellow-green solid precipitates, filter the solid The precipitate was washed and dried to obtain a crosslinking agent. Add the cross-linking agent to N,N-dimethylacetamide, condense and reflux for 4 hours, and filter to obtain a clear filtrate, which is used as a cross-linking agent solution. Soak the polybenzimidazole film in the above cross-linking agent solution at a temperature of 70° C., take it out for washing after soaking for 4 hours, and obtain a cross-linked polybenzimidazole film after drying.

Embodiment 3

[0041] First 2.14g tetraaminobiphenyl and 64.0g phosphorus pentoxide and 100.0g polyphosphoric acid are added in the there-necked flask with stirring and condensing reflux device, N 2 In the atmosphere, stir at 150°C for 8 hours, add 2.29g of methyl bromomethylbenzoate, stir for 3 hours, the solution turns from brown to green, add deionized water to the mixed solution, a yellow-green solid precipitates, filter The solid precipitate was washed and dried to obtain a crosslinking agent. Add the cross-linking agent to N-methylpyrrolidone, condense and reflux for 5 hours, and filter to obtain a clear filtrate as the cross-linking agent solution. Soak the polybenzimidazole film in the above crosslinking agent solution at a temperature of 80° C., take it out for washing after soaking for 5 hours, and obtain a crosslinked polybenzimidazole film after drying.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses preparation methods of a novel cross-linking agent and a cross-linked polybenzimidazole proton exchange membrane, and belongs to the technical field of fuel cell membrane electrode assemblies. The methods comprises the steps that at first, the novel cross-linking agent containing a benzimidazole structure and a dibromomethyl group is prepared, then a polybenzimidazole membrane is soaked in a solution containing the cross-linking agent, and a cross-linked proton exchange membrane material is obtained. The applied cross-linking process is simple and suitable for all polybenzimidazole membranes, and the cross-linked membranes have much greater mechanical properties, oxidation stability and the like than uncross-linked membranes, and the membranes have the excellent phosphate absorption capacity, and is very suitable for being applied in high temperature proton exchange membrane fuel cells.

Description

technical field [0001] The invention belongs to the technical field of fuel cell membrane electrode assemblies, and in particular relates to a novel crosslinking agent and a preparation method of a crosslinked polybenzimidazole proton exchange membrane. Background technique [0002] Since the 21st century, with the economic globalization and the improvement of people's living standards, energy has been widely concerned by people, and finding new sustainable energy sources has become a major theme in today's world. Proton exchange membrane fuel cells use clean energy such as hydrogen or methanol, and have the advantages of low operating temperature, high specific power, and fast start-up, and can be widely used in land, sea, air, and aerospace fields. As an important part of the proton exchange membrane, it can not only transport protons, but also play a role in blocking fuel. DuPont's The representative perfluorosulfonic acid membrane is widely used in proton exchange mem...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C07D235/18H01M8/103H01M8/1072
CPCC07D235/18H01M8/103H01M8/1072Y02E60/50
Inventor 徐世爱蔡洋奔
Owner EAST CHINA UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap