Preparation method of polyvinylidene fluoride-polyvinyl alcohol composite proton exchange membrane

A polyvinylidene fluoride and proton exchange membrane technology, which is applied in the field of polyvinylidene fluoride-polyvinyl alcohol composite proton exchange membrane preparation, can solve the difficulties in the synthesis of perfluorinated substances, sulfonation and film formation, high temperature and water content requirements, Reduce membrane swelling rate and other problems, achieve the effects of reduced swelling degree, good alcohol resistance performance, and low alcohol permeability

Inactive Publication Date: 2013-11-20
INNER MONGOLIA UNIV OF SCI & TECH
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the proton exchange membranes currently used in DMFC are hydrated perfluorosulfonic acid membranes such as Nafion. Nafion membranes have good chemical and mechanical stability and excellent proton conductivity, but there are also the following defects: (1) Synthesis of perfluorinated substances , sulfonation, and film formation are very difficult and costly; (2) High requirements on temperature and water content, hydration of sulfonic acid membranes exceeding the boiling point of water will cause a sharp drop in water content and a rapid drop in conductivity; (3) a certain Some hydrocarbons (such as methanol, etc.) have high permeability in this type of m

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 method of polyvinylidene fluoride-polyvinyl alcohol composite proton exchange membrane
  • Preparation method of polyvinylidene fluoride-polyvinyl alcohol composite proton exchange membrane
  • Preparation method of polyvinylidene fluoride-polyvinyl alcohol composite proton exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dissolve 20g of polyvinyl alcohol in a mixture of 180g of dimethyl sulfoxide and 18g of water, heat to 90°C, and stir at this temperature for 2 hours; when the temperature drops to 70°C, add 3.23g of silicon tetrachloride, 3.23g sodium tungstate and 0.6g oxalic acid, stirred at this temperature for 3 hours; heated to 120°C in a vacuum oil bath, added 5.2g PVDF, continued to stir for 2 hours, then cooled to room temperature in vacuum, and poured the formed solution on polytetrafluoroethylene Dry it on an ethylene glass plate to form a film, the thickness of the film is controlled at 0.1-0.2 mm, and the vacuum drying temperature: 110°C, that is, the desired polyvinylidene fluoride / polyvinyl alcohol composite proton doped with silicotungstic acid and silicon dioxide can be obtained exchange membrane.

[0030] Soak the membrane in deionized water for 12 hours before use. The conductivity was measured by the two-electrode AC impedance method, and the swelling degree ( SD ...

Embodiment 2

[0034] Dissolve 20g of polyvinyl alcohol in a mixture of 180g of dimethyl sulfoxide and 18g of water, heat to 90°C, and stir at this temperature for 2 hours; when the temperature drops to 70°C, add 8.8g of silicon tetrachloride, 8.8g sodium tungstate and 1.2g oxalic acid, stirred at this temperature for 3 hours; heated to 120°C in a vacuum oil bath, added 20g PVDF, continued to stir for 2 hours, then cooled to room temperature in vacuum, and poured the formed solution on polytetrafluoroethylene Dry on a glass plate to form a film, the thickness of the film is controlled at 0.1-0.2 mm, and the vacuum drying temperature is 110°C to obtain the required polyvinylidene fluoride / polyvinyl alcohol composite proton exchange doped with silicotungstic acid and silicon dioxide membrane.

Embodiment 3

[0036] Dissolve 20g of polyvinyl alcohol in a mixture of 180g of dimethyl sulfoxide and 18g of water, heat to 90°C, and stir at this temperature for 2 hours; when the temperature drops to 70°C, add 3.45g of silicon tetrachloride, 3.45g sodium tungstate and 0.69g oxalic acid, stirred at this temperature for 3 hours; heated to 120°C in a vacuum oil bath, added 6.2g PVDF, continued to stir for 2 hours, then cooled to room temperature in vacuum, and poured the formed solution on polytetrafluoroethylene Dry it on an ethylene glass plate to form a film, the thickness of the film is controlled at 0.1-0.2 mm, and the vacuum drying temperature: 110°C, that is, the desired polyvinylidene fluoride / polyvinyl alcohol composite proton doped with silicotungstic acid and silicon dioxide can be obtained exchange membrane.

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 a preparation method of a polyvinylidene fluoride-polyvinyl alcohol composite proton exchange membrane and belongs to the field of a battery electrolyte material. The preparation method comprises the following steps of: firstly preparing a polymer solution by dissolving polyvinyl alcohol in mixed liquid of dimethyl sulfoxide and water; adding silicon tetrachloride and sodium tungstate to the polymer solution; heating, stirring, and then adding polyvinylidene fluoride; carrying out oil bath in vacuum, heating and stirring so as to form a solution; pouring the solution on a polytetrafluoroethylene glass plate and drying to form a membrane, thus obtaining the needed silicotungstic acid and silicon dioxide doped polyvinylidene fluoride-polyvinyl alcohol composite proton exchange membrane. The proton exchange membrane prepared by the method has very good proton electrical conductivity, low methyl alcohol permeability and relatively low swelling degree and is favorable for large-scale production.

Description

[0001] technical field [0002] The invention relates to a method for preparing a polyvinylidene fluoride-polyvinyl alcohol composite proton exchange membrane doped with silicotungstic acid and silicon dioxide, and belongs to the field of battery electrolyte materials. Background technique [0003] Direct methanol fuel cell (DMFC) has broad application prospects as a portable mobile power supply in the fields of communication, military and emergency rescue. As the core material of direct methanol fuel cells, the proton exchange membrane acts as a selective conductor from the cathode to the anode, while it blocks fuel and oxidant. The performance of the proton exchange membrane determines the performance of the fuel cell. [0004] Most of the proton exchange membranes currently used in DMFC are hydrated perfluorosulfonic acid membranes such as Nafion. Nafion membranes have good chemical and mechanical stability and excellent proton conductivity, but there are also the follow...

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
IPC IPC(8): C08J5/22C08L29/04C08L27/16C08K3/34C08K3/36
Inventor 郭贵宝许嘉安胜利
Owner INNER MONGOLIA 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