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Preparation method of thermal crosslinking type sulfonated polysulfone ion exchange membrane

A technology of ion exchange membrane and sulfonated polysulfone, which is applied in the field of preparation of thermally crosslinked sulfonated polysulfone ion exchange membrane, can solve the problems of high water absorption and swelling degree, poor application effect, and inability to guarantee mechanical properties, etc. , to achieve the effect of reducing water absorption and swelling degree, improving mechanical properties and thermal stability

Inactive Publication Date: 2018-03-02
SHAANXI JUJIEHAN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most commercial polysulfone-based cation exchange membranes are main-chain membrane products made by direct sulfonation modification of polysulfone, which are mainly used in membrane separation, but due to the high degree of sulfonation, the water absorption and swelling degree of the membrane are relatively High, so that it cannot guarantee good mechanical properties in practical ion exchange applications, making the application effect poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation method of heat-crosslinked sulfonated polysulfone ion exchange membrane comprises the following steps:

[0018] (1) Transformation treatment of sulfonated polysulfone: Soak sulfonated polysulfone with a sulfonation degree of 80% in 0.5mol / L sulfuric acid solution for 24 hours, take it out, rinse it with deionized water for 5 times, and then put it under 50℃ Dry for 12 hours to obtain H-type sulfonated polysulfone solid;

[0019] (2) Preparation of casting solution: Add 1799 type polyvinyl alcohol into dimethyl sulfoxide, stir at 30°C for 2 hours, then stir at 60°C for 3 hours to obtain a dimethyl sulfoxide solution of polyvinyl alcohol , adding the H-type sulfonated polysulfone solid obtained in step (1), stirring at 30°C for 3 hours, standing still for 20 hours, and then ultrasonically dispersing for 20 minutes under the conditions of ultrasonic power 100W and ultrasonic frequency 50Hz to obtain a casting solution; , the mass ratio of polyvinyl alcohol...

Embodiment 2

[0022] The preparation method of heat-crosslinked sulfonated polysulfone ion exchange membrane comprises the following steps:

[0023] (1) Transformation treatment of sulfonated polysulfone: Soak sulfonated polysulfone with a sulfonation degree of 80% in 0.5mol / L sulfuric acid solution for 48 hours, take it out, rinse it with deionized water for 5 times, and then heat it at 70°C Dry for 12 hours to obtain H-type sulfonated polysulfone solid;

[0024] (2) Preparation of casting solution: Add 1799 type polyvinyl alcohol into dimethyl sulfoxide, stir at 30°C for 2 hours, then stir at 60°C for 3 hours to obtain a dimethyl sulfoxide solution of polyvinyl alcohol , adding the H-type sulfonated polysulfone solid obtained in step (1), stirring at 50°C for 3 hours, standing still for 20 hours, and then ultrasonically dispersing for 20 minutes under the conditions of ultrasonic power 400W and ultrasonic frequency 50Hz to obtain a casting solution; , the mass ratio of polyvinyl alcohol,...

Embodiment 3

[0027] The preparation method of heat-crosslinked sulfonated polysulfone ion exchange membrane comprises the following steps:

[0028] (1) Transformation treatment of sulfonated polysulfone: Soak sulfonated polysulfone with a sulfonation degree of 80% in 0.5mol / L sulfuric acid solution for 36 hours, take it out, rinse it with deionized water for 5 times, and then heat it at 60°C Dry for 12 hours to obtain H-type sulfonated polysulfone solid;

[0029] (2) Preparation of casting solution: Add 1799 type polyvinyl alcohol into dimethyl sulfoxide, stir at 30°C for 2 hours, then stir at 60°C for 3 hours to obtain a dimethyl sulfoxide solution of polyvinyl alcohol , adding the H-type sulfonated polysulfone solid obtained in step (1), stirring at 40°C for 3 hours, standing still for 20 hours, and then ultrasonically dispersing for 20 minutes under the conditions of ultrasonic power 300W and ultrasonic frequency 50Hz to obtain a casting solution; , the mass ratio of polyvinyl alcohol,...

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Abstract

The invention discloses a method for preparing a heat-crosslinked sulfonated polysulfone ion exchange membrane, which comprises the following steps: (1) Transformation treatment of sulfonated polysulfone: soaking sulfonated polysulfone in sulfuric acid solution, taking it out and using it Rinse with ion water, then dry to obtain H-type sulfonated polysulfone solid; (2) Preparation of casting solution: add polyvinyl alcohol to dimethyl sulfoxide, stir to obtain dimethyl sulfoxide of polyvinyl alcohol Sulfone solution, add H-type sulfonated polysulfone solid, stir, stand still, and ultrasonically disperse to obtain casting solution; (3) Preparation of thermally crosslinked membrane: pour casting solution on a polytetrafluoroethylene plate, scrape Make a film, dry it in vacuum, and then dry it at 140°C for 8‑12h. The thermally cross-linked sulfonated polysulfone ion exchange membrane prepared by the invention effectively reduces the water absorption rate and swelling degree of the membrane, and improves the mechanical performance and thermal stability of the membrane.

Description

technical field [0001] The invention belongs to the technical field of membrane preparation, and in particular relates to a method for preparing a heat-crosslinked sulfonated polysulfone ion-exchange membrane. Background technique [0002] Ion exchange membrane is a functional membrane material with active groups, which are acidic or basic ionic groups, endowing the membrane with the function of ion exchange. In the past few decades, ion exchange membrane technology has been widely used in electrodialysis, diffusion dialysis, chlor-alkali industry and fuel cells and other fields. In order to meet the requirements of practical applications, ion exchange membranes need to have high ion selectivity, low membrane resistance, good mechanical stability and good chemical stability. Generally, ion exchange membranes with high ion selectivity and low membrane resistance have high IEC values, and high IEC values ​​will lead to high water absorption, which will cause large dimensional...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D69/06B01D71/68
CPCB01D71/68B01D67/0006B01D69/02B01D69/06B01D2325/42
Inventor 李长英
Owner SHAANXI JUJIEHAN CHEM CO LTD
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