Preparation method of photo-crosslinked sulphonated polysulfone ion exchange membrane

A technology of ion exchange membrane and sulfonated polysulfone, which is applied in the field of preparation of photocross-linked sulfonated polysulfone ion exchange membrane, can solve the problems of decreased dimensional stability, impact on application efficiency, excessive swelling, etc., and achieve high ion conductivity and Selectivity, process low, effect of high ion exchange capacity

Active Publication Date: 2016-12-07
YIWU SCI & TECH INST CO LTD OF ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the increase of its sulfonation degree, the dimensional stability decreases obviously, and the excessive hydrophilicity leads to its excessive swelling, which seriously affects the application efficiency

Method used

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  • Preparation method of photo-crosslinked sulphonated polysulfone ion exchange membrane
  • Preparation method of photo-crosslinked sulphonated polysulfone ion exchange membrane
  • Preparation method of photo-crosslinked sulphonated polysulfone ion exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Accurately weigh 4 g of sulfonated polysulfone with a sulfonation degree of 80%, dissolve it in 16 g of N'N-dimethylformamide (DMF) to form a solution with a mass fraction of 20%, stir at 60°C for 6 hours, and then Set aside to cool. Add 0.3 g of photoinitiator TPO and 1.5 g of crosslinking agent trimethylolpropane triacrylate to the obtained homogeneous solution, stir at room temperature for 3 hours to obtain a homogeneous solution, let it stand overnight for defoaming, and obtain a casting solution. Pour the casting liquid onto a dry, clean and smooth glass plate, and quickly scrape the automatic film scraper perpendicular to the glass plate to form a film with an initial thickness of 600 μm. Put the scraped film into the UV cross-linking apparatus quickly, and after irradiating with ultraviolet light for 15 minutes, quickly place the film at 60°C for 24 hours in vacuum to obtain a photo-crosslinked sulfonated polysulfone film with a sulfonation degree of 80%. .

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Embodiment 2

[0030] Accurately weigh 3 g of sulfonated polysulfone with a sulfonation degree of 80%, dissolve it in 17 g of N'N-dimethylformamide (DMF) to form a solution with a mass fraction of 15%, stir at 70°C for 5 hours, and then Set aside to cool. Add 0.3 g of photoinitiator TPO and 1.5 g of crosslinking agent trimethylolpropane triacrylate to the obtained homogeneous solution, stir at room temperature for 3 hours to obtain a homogeneous solution, let it stand overnight for defoaming, and obtain a casting solution. Pour the casting liquid onto a dry, clean and smooth glass plate, and quickly scrape the automatic film scraper perpendicular to the glass plate to form a film with an initial thickness of 600 μm. Put the scraped film into the UV cross-linking apparatus quickly, and after irradiating with ultraviolet light for 15 minutes, quickly place the film at 60°C for 24 hours in vacuum to obtain a photo-crosslinked sulfonated polysulfone film with a sulfonation degree of 80%. .

[...

Embodiment 3

[0033] Accurately weigh 4 g of sulfonated polysulfone with a sulfonation degree of 60%, dissolve it in 16 g of N'N-dimethylformamide (DMF) to form a solution with a mass fraction of 20%, stir at 80°C for 5 hours, and then Set aside to cool. Add 0.2 g of photoinitiator TPO and 1 g of cross-linking agent trimethylolpropane triacrylate to the obtained homogeneous solution, stir at room temperature for 3 hours to obtain a homogeneous solution, let it stand overnight for defoaming, and obtain a casting solution. Pour the casting liquid onto a dry, clean and smooth glass plate, and quickly scrape the automatic film scraper perpendicular to the glass plate to form a film with an initial thickness of 600 μm. Put the scraped membrane into the UV cross-linking apparatus quickly, and after irradiating with ultraviolet light for 10 minutes, quickly place the membrane at 60°C for 24 hours in vacuum to obtain a photo-crosslinked sulfonated polysulfone membrane with a sulfonation degree of 6...

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Abstract

The invention discloses a preparation method of a photo-crosslinked sulphonated polysulfone ion exchange membrane. The method comprises the following steps that 1, sulphonated polysulfone with a certain sulfonation degree is dissolved in a solution prepared from N,N-dimethylformamide (DMF), stirring is conducted, and standing and cooling are conducted at room temperature; 2, a photoinitiator and a cross-linking agent are added in the solution obtained in the first step, stirring is conducted, a uniform solution is obtained, standing is conducted, and a membrane casting solution is obtained; 3, the membrane casting solution obtained in the second step is poured on a glass plate, an automatic membrane scraper is used for rapid scraping in the mode of being perpendicular to the glass plate, and a membrane is formed; 4, the membrane obtained through scraping in the third step is rapidly subjected to ultraviolet irradiation, the membrane is rapidly put in vacuum of 50 DEG C to 80 DEG C to be dried, and the photo-crosslinked sulphonated polysulfone membrane is obtained. The exchange membrane obtained through the method is good in chemical stability, low in swelling degree and high in ion exchange capacity.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a method for preparing an ultraviolet-light crosslinked photocross-sulfonated polysulfone ion-exchange membrane. Background technique [0002] Ion exchange membranes have been widely used in electrodialysis, diffusion dialysis, chlor-alkali industry, fuel cells and other fields. However, ion exchange membranes with high ion selectivity and low membrane resistance usually have high ion exchange capacity, and high ion exchange capacity will lead to high water absorption and large dimensional changes in the membrane, resulting in swelling. The mechanical strength is greatly reduced, seriously affecting its application. [0003] The cross-linking process can effectively reduce the water absorption and swelling of the membrane and improve the mechanical properties of the membrane, so it is often used to improve the membrane performance. Among them, covalent crosslinking ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08J3/28C08J3/24B01J39/18
CPCC08J3/24C08J3/28C08J5/2256C08J2381/06
Inventor 沈江南周玛丽杨珊珊陈徐韩波高从堦
Owner YIWU SCI & TECH INST CO LTD OF ZHEJIANG UNIV OF TECH
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