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Preparation method of novel lignosulfonic acid/Nafion composite proton exchange membrane

A technology of lignosulfonic acid and proton exchange membranes, which is applied in the field of preparation of new lignosulfonic acid/Nafion composite proton exchange membranes, can solve the problems of high cost of proton exchange membranes, decreased mechanical properties, and environmental pollution, etc. Dense and stable, improved mechanical properties, low cost effect

Active Publication Date: 2021-05-14
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims at the defects such as high cost, poor performance at high temperature and pollution to the environment of current proton exchange membranes, and provides a novel preparation method of lignosulfonic acid / Nafion proton exchange membrane materials, while using polyvinyl alcohol (PVA ) as a reinforcing agent to solve the problem of the decline in mechanical properties caused by Nafion doping into lignosulfonic acid; the method first fully dissolves sodium lignosulfonate in deionized water, and then uses hydrochloric acid to adjust the pH of the solution, that is, under acidic conditions , sodium ions and chloride ions in the solution combine to form sodium chloride and dissolve in water due to electrostatic interaction, while sulfonate ions combine with hydrogen ions to form sulfonic acid and precipitate in the solution; The sodium content was detected, and the result was that the sodium content was only 0.32%, while the sodium content in the original sodium lignosulfonate was 11.9%.

Method used

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  • Preparation method of novel lignosulfonic acid/Nafion composite proton exchange membrane
  • Preparation method of novel lignosulfonic acid/Nafion composite proton exchange membrane
  • Preparation method of novel lignosulfonic acid/Nafion composite proton exchange membrane

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Embodiment 1

[0029] (1) Dissolve 10 g of sodium lignosulfonate powder in 40 mL of deionized water at room temperature, and stir well until no obvious solid matter exists in the solution;

[0030] (2) Slowly add the previously prepared 10% hydrochloric acid solution dropwise into the sodium lignosulfonate solution in step 1) until the pH is 2.0, continue to stir for 2 hours until the lignosulfonic acid is fully separated, centrifugally wash, freeze-dry for 24 hours to obtain lignin Sulfonic acid solid powder;

[0031] (3) Take 1.5mL of 20% Nafion dispersion in a clean small beaker, dry at 60°C for 12h to evaporate the solvent to obtain 370mg of solid Nafion resin, add 8mL of N,N-dimethylacetamide solution, and seal Dissolve evenly in a water bath at 60°C, then add 18.5mg of lignosulfonic acid and 370mg of 10% PVA solution, and continue stirring for 12 hours;

[0032] (4) Pour the homogeneous casting solution obtained in step (3) into a clean petri dish, place it horizontally in a vacuum dr...

Embodiment 2

[0034] (1) Dissolve 15g of sodium lignosulfonate powder in 50mL of deionized water at room temperature, and stir well until no obvious solid matter exists in the solution;

[0035] (2) Slowly add the previously prepared 10% hydrochloric acid solution dropwise into the sodium lignosulfonate solution in step 1) until the pH is 2.0, continue to stir for 2 hours until the lignosulfonic acid is fully separated, centrifugally wash, freeze-dry for 24 hours to obtain lignin Sulfonic acid solid powder;

[0036] (3) Take 1.5mL of 20% Nafion dispersion in a clean small beaker, dry at 60°C for 12h to evaporate the solvent to obtain 370mg of solid Nafion resin, add 8mL of N,N-dimethylacetamide solution, and seal Dissolve evenly in a water bath environment at 60°C, then add 55.5mg of lignosulfonic acid and 370mg of 10% PVA solution, and continue stirring for 12 hours;

[0037](4) Pour the homogeneous casting solution obtained in step (3) into a clean petri dish, place it horizontally in a ...

Embodiment 3

[0039] (1) Dissolve 15g of sodium lignosulfonate powder in 50mL of deionized water at room temperature, and stir well until no obvious solid matter exists in the solution;

[0040] (2) Slowly add the previously prepared 10% hydrochloric acid solution dropwise into the sodium lignosulfonate solution in step 1) until the pH is 2.0, continue to stir for 2 hours until the lignosulfonic acid is fully separated, centrifugally wash, freeze-dry for 24 hours to obtain lignin Sulfonic acid solid powder;

[0041] (3) Take 1.5mL of 20% Nafion dispersion in a clean small beaker, dry at 60°C for 12h to evaporate the solvent to obtain 370mg of solid Nafion resin, add 8mL of N,N-dimethylacetamide solution, and seal Dissolve evenly in a water bath at 60°C, then add 37mg of lignosulfonic acid and 370mg of 10% PVA solution, and continue stirring for 12 hours;

[0042] (4) Pour the homogeneous casting solution obtained in step (3) into a clean petri dish, place it horizontally in a vacuum drying...

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Abstract

The invention provides a preparation method of a novel lignosulfonic acid / Nafion composite proton exchange membrane. The method comprises the following steps: 1, adding sodium lignin sulfonate powder into deionized water to fully dissolve the sodium lignin sulfonate powder, adjusting the pH value of the solution by using a hydrochloric acid solution until precipitate appears in the solution, centrifugally washing, and freeze-drying to obtain lignosulfonic acid; and 2, adding lignosulfonic acid and polyvinyl alcohol into a Nafion solution, carrying out magnetic stirring and ultrasonic dispersion to form a uniform solution, coating the surface of glassware with the obtained solution, and carrying out vacuum drying at 80-120 DEG C for 12-24 hours to obtain the composite proton exchange membrane material. The lignosulfonic acid composite proton exchange membrane is mild in preparation condition, the cost of the prepared proton exchange membrane is greatly reduced, the proton conductivity is high, and the thermal stability and the mechanical property are excellent.

Description

technical field [0001] The invention relates to a preparation method of a novel lignosulfonic acid / Nafion composite proton exchange membrane, which belongs to the field of fuel cell proton exchange membranes. Background technique [0002] With the continuous advancement of human industrialization, environmental pollution and energy crisis have gradually become important factors restricting the continued development of human beings. Therefore, the development and utilization of clean and renewable new energy has been paid attention to by countries all over the world. A fuel cell (Fuel Cell) is an energy conversion device that converts the chemical energy stored in the fuel into electrical energy and utilizes it. Fuel cells have no combustion process during operation, and the conversion process is green and environmentally friendly, with high energy density and low noise. It is an effective way to solve the current energy crisis and slow down the greenhouse effect. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1069H01M8/1086H01M8/1088H01M8/1051
CPCH01M8/1069H01M8/1086H01M8/1088H01M8/1051H01M2008/1095Y02E60/50
Inventor 雷建都朱礼玉靳梦晨李玉成赵静养
Owner BEIJING FORESTRY UNIVERSITY
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