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Sodium polystyrenesulfonate/polyvinyl alcohol cation exchange membrane and preparation method thereof

A technology of sodium polystyrene sulfonate and polyvinyl alcohol cation, applied in cation exchange materials and other directions, can solve problems such as high price, and achieve the effects of improving water resistance, high water absorption, dimensional stability, and good water resistance

Pending Publication Date: 2022-03-11
江苏美淼储能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the currently commercialized cation exchange membranes, it is recognized that the perfluorosulfonic acid membrane produced by DuPont has the best performance. It has important applications in the fields of dye batteries and chlor-alkali industry, but it is expensive. Therefore, the development of new cation exchange membrane materials is subject to The attention of researchers from all over the world

Method used

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  • Sodium polystyrenesulfonate/polyvinyl alcohol cation exchange membrane and preparation method thereof
  • Sodium polystyrenesulfonate/polyvinyl alcohol cation exchange membrane and preparation method thereof

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preparation example Construction

[0012] The preparation methods of sulfonated membrane materials mainly include pre-sulfonation and post-sulfonation. According to the position of the sulfonic acid group, it can be divided into main chain sulfonation and side chain sulfonation. At present, side chain sulfonation is mainly used. Membrane materials with a high degree of sulfonation are mainly prepared by the pre-sulfonation method, that is, the polymerization of sulfonated monomers is used. The membrane materials prepared by homopolymerization of sulfonated monomers are very hydrophilic and have a very high degree of swelling in water, even a large amount. dissolve. Therefore, the pre-sulfonation method generally uses sulfonated monomers to copolymerize with other monomers to form a cross-linked structure to improve the water resistance of the membrane. The post-sulfonation method is to graft sulfonic acid groups on the polymer chain. Due to the steric hindrance effect, the degree of sulfonation is generally low...

Embodiment 1

[0025] (1) Preparation of casting solution

[0026] Add polyvinyl alcohol solids with a degree of polymerization of 2000 and a degree of alcoholysis of 88 into distilled water, mechanically stir at 90°C until completely dissolved, and cool for later use; Dissolved in distilled water at room temperature, configured as a solution for later use, mixed polyvinyl alcohol and sodium polystyrene sulfonate solution evenly to prepare a casting solution, wherein the mass ratio of polyvinyl alcohol and sodium polystyrene sulfonate was 2:1, and controlled The concentration of the whole casting solution is 8%.

[0027] (2) Preparation of cross-linking solution

[0028] Mix 6mL of 50vol% methanol, 4mL of 10vol% acetic acid, 2mL of 10vol% sulfuric acid and 2mL of 5vol% glutaraldehyde to prepare a cross-linking solution.

[0029] (3) Preparation of cation exchange membrane

[0030] Take 15mL casting solution and 3mL cross-linking solution and quickly mix them evenly, scrape the film on a c...

Embodiment 2

[0032] (1) Preparation of casting solution

[0033] Add polyvinyl alcohol solids with a degree of polymerization of 1700 and a degree of alcoholysis of 99 to distilled water, mechanically stir at 90°C until completely dissolved, and cool for later use; Dissolved in distilled water at room temperature, prepared as a solution for later use, mixed polyvinyl alcohol and sodium polystyrene sulfonate solution in a certain proportion to prepare a casting solution, wherein the mass ratio of polyvinyl alcohol and sodium polystyrene sulfonate was 1:1 , and control the concentration of the entire casting solution to be 12%.

[0034] (2) Preparation of cross-linking solution

[0035] Mix 5mL of 50vol% methanol, 3mL of 10vol% acetic acid, 1mL of 10vol% sulfuric acid and 3mL of 8vol% glutaraldehyde to prepare a cross-linking liquid.

[0036] (3) Preparation of cation exchange membrane

[0037] Take 10mL of casting solution and 2mL of crosslinking solution and quickly mix them evenly, scr...

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Abstract

The invention belongs to the technical field of cation exchange membranes, and particularly relates to a sodium polystyrenesulfonate / polyvinyl alcohol cation exchange membrane and a preparation method thereof. The preparation method of the sodium polystyrenesulfonate polyvinyl alcohol cation exchange membrane comprises the following steps: mixing a polyvinyl alcohol solution and a sodium polystyrenesulfonate solution to prepare a membrane casting solution; mixing methanol, acetic acid, sulfuric acid and a cross-linking agent to prepare a cross-linking solution; and mixing the membrane casting solution and the crosslinking solution, scraping the membrane, heating and crosslinking to obtain the crosslinking type cation exchange membrane. Polyvinyl alcohol and sodium polystyrenesulfonate are used as membrane materials, water is used as a solvent, and the process meets the environmental protection requirement; the cross-linked sodium polystyrenesulfonate / polyvinyl alcohol cation exchange membrane prepared by the invention has better water resistance, and keeps higher water absorption and dimensional stability while improving the water resistance.

Description

technical field [0001] The invention belongs to the technical field of cation exchange membranes, and in particular relates to a sodium polystyrene sulfonate / polyvinyl alcohol cation exchange membrane and a preparation method. Background technique [0002] The ion exchange membrane is a polymer membrane containing ionic groups and has the ability to selectively permeate the ions in the solution. Because its ion selective permeability is generally used in application, it is also called ion selective permeability membrane. [0003] Ion exchange membrane separation technology has occupied an indispensable position in the fields of environmental protection, chemical synthesis and food processing. Among the currently commercialized cation exchange membranes, it is recognized that the perfluorosulfonic acid membrane produced by DuPont has the best performance. It has important applications in the fields of dye batteries and chlor-alkali industry, but it is expensive. Therefore, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J39/20
CPCB01J39/20
Inventor 沈敏蒋建锋王秋泽
Owner 江苏美淼储能科技有限公司