Non-asbestos alkaline electrolyzed water composite diaphragm and preparation method thereof

A technology of composite diaphragm and electrolysis of water, which is applied in the direction of diaphragm, electrolysis components, electrolysis process, etc., can solve the problems of poor hydrophilicity of polysulfone diaphragm, affect the flow of electrolyte, and reduce the performance of diaphragm, so as to improve hydrophilicity and reduce surface area. Resistance, the effect of improving the current efficiency

Pending Publication Date: 2022-05-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the research on the performance of polysulfone diaphragm, it is found that the polysulfone diaphragm has excellent performance in alkali corrosion resistance, high temperature resistance and tensile strength, which fully meets the requirements of alkaline water electrolysis diaphragm, but polysulfone diaphragm is poor in hydrophilicity, and in the process of water electrolysis Hydrogen and oxygen microbubbles are easy to accumulate on the surface of the diaphragm, which affects the flow of the electrolyte, reduces the current efficiency, and greatly reduces the performance of the diaphragm. The field of electrolytic diaphragm has more superior application prospects

Method used

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  • Non-asbestos alkaline electrolyzed water composite diaphragm and preparation method thereof
  • Non-asbestos alkaline electrolyzed water composite diaphragm and preparation method thereof
  • Non-asbestos alkaline electrolyzed water composite diaphragm and preparation method thereof

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preparation example Construction

[0051] A preparation method of non-asbestos alkaline electrolyzed water composite diaphragm, the steps are as follows:

[0052] (1) Preparation of casting solution:

[0053] In the polysulfone polymer solution, add a polymer reinforcing agent, a pore-forming agent and a hydrophilic modifier, and after the reaction, perform degassing treatment to obtain a uniform milky white casting solution;

[0054] (2) Preparation of polysulfone / zirconia composite diaphragm:

[0055] Pour the film-casting solution obtained in step (1) directly onto the glass plate, adjust the distance between the scraper and the glass plate, scrape it with a film scraper to form a film, and pre-evaporate in the air for a period of time, then put it into a degasser at a certain temperature. In ionized water, the liquid film gradually coagulates, falls off the glass plate, and is taken out from the coagulation bath to obtain a polysulfone / zirconia composite diaphragm;

[0056] (3) Post-treatment of polysulfo...

Embodiment 1

[0059] A preparation method of non-asbestos alkaline electrolyzed water composite diaphragm, the steps are as follows:

[0060] (1) Preparation of casting solution:

[0061] Place 3.0 g of polysulfone with a molecular weight of about 80,000 in a flask containing 11.0 g of commercially available N-methylpyrrolidone, stir at room temperature to dissolve it (rotating speed 350 r / min), and slowly add 0.5 g of hydrogenated nitrile rubber , 3.0g polyvinylpyrrolidone and 3.0g zirconium dioxide, continue stirring for 2 days to obtain a milky white casting solution, then reduce the stirring speed to 50r / min, continue stirring for 24h, and carry out degassing treatment;

[0062] (2) Preparation of polysulfone / zirconia composite diaphragm:

[0063] Adjust the distance between the scraper and the glass plate to 300 μm, pour an appropriate amount of the casting solution prepared in step (1) onto the front end of the glass plate, scrape it with a film scraper to form a film, stay in the ai...

Embodiment 2

[0068] A preparation method of non-asbestos alkaline electrolyzed water composite diaphragm, the steps are as follows:

[0069] (1) Preparation of casting solution:

[0070] Put 1.5g of polysulfone with a molecular weight of about 80,000 in a flask containing 11.0g of commercially available N-methylpyrrolidone, stir at room temperature to dissolve it (rotating speed 350r / min), slowly add 0.5g of SEBS rubber, 3.0g Polyvinylpyrrolidone and 4.5g zirconium dioxide were continued to stir for 2 days to obtain a milky white casting solution, then the stirring speed was reduced to 50r / min, and the stirring was continued for 24h to carry out degassing treatment;

[0071] (2) Preparation of polysulfone / zirconia composite diaphragm:

[0072] Adjust the distance between the scraper and the glass plate to 300 μm, pour an appropriate amount of the casting solution prepared in step (1) onto the front end of the glass plate, scrape it with a film scraper to form a film, stay in the air for 3...

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Abstract

The invention relates to a non-asbestos alkaline electrolyzed water composite diaphragm and a preparation method thereof, and belongs to the technical field of electrolyzed water hydrogen production, and the preparation method comprises the following steps: (1) preparing a membrane casting solution; (2) preparation of a polysulfone / zirconium dioxide composite diaphragm; and (3) post-treatment of the polysulfone / zirconium dioxide composite diaphragm. The preparation method is efficient and convenient in reaction, and large-area preparation of the alkaline electrolyzed water diaphragm is facilitated. The reaction is efficient and convenient, and large-area preparation of the non-asbestos alkaline electrolyzed water composite diaphragm is easy; polysulfone resin with high alkali resistance and a high-molecular reinforcing agent are used as polymers; zirconium dioxide is used for carrying out hydrophilic modification on the polymer, and the addition of ZrO2 can improve the hydrophilicity of the polymer, so that the surface resistance is effectively reduced, and the current efficiency is improved. The alkaline composite diaphragm has good corrosion resistance, the alkali loss is 1.85%, and meanwhile, the prepared diaphragm shows good mechanical performance.

Description

technical field [0001] The invention relates to an alkaline electrolyzed water composite diaphragm and a preparation method thereof, in particular to a non-asbestos alkaline electrolyzed water composite diaphragm and a preparation method thereof, belonging to the technical field of hydrogen production by electrolyzed water. [0002] technical background [0003] Nowadays, energy shortage and environmental problems are becoming more and more prominent. The development of renewable energy and efficient use of energy is a hot issue facing the world today, and it is of great significance to the sustainable development of the world economy. As an efficient and clean secondary energy source, hydrogen energy has attracted extensive attention from experts. In addition to being used as an energy source, hydrogen is also widely used in electronics, aerospace, chemical and other fields, and its demand is increasing. [0004] Hydrogen production by electrolysis of water has the advanta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/02B01D67/00B01D71/68C25B13/08C25B13/02C25B1/04
CPCB01D69/12B01D69/02B01D67/0079B01D71/68B01D71/024C25B13/08C25B13/02C25B1/04B01D2325/30B01D2325/36
Inventor 朱红田琳王智谦汪中明
Owner BEIJING UNIV OF CHEM TECH
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