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Method for preparing sulfonated polysulfone cation exchange films different in three-dimension structure by regulating crosslinking functionality and application thereof

An ion exchange membrane and sulfonated polysulfone cation technology, which is applied in the field of membrane material preparation and separation, can solve the problems affecting the stable operation and application efficiency of equipment, and achieve the effects of good application prospects, high ion exchange capacity and low energy consumption.

Inactive Publication Date: 2019-04-05
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the degree of sulfonation increases, excessive swelling is caused, which greatly affects the stable operation and application efficiency of the equipment.

Method used

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  • Method for preparing sulfonated polysulfone cation exchange films different in three-dimension structure by regulating crosslinking functionality and application thereof
  • Method for preparing sulfonated polysulfone cation exchange films different in three-dimension structure by regulating crosslinking functionality and application thereof
  • Method for preparing sulfonated polysulfone cation exchange films different in three-dimension structure by regulating crosslinking functionality and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Accurately weigh 5 g of sulfonated polysulfone (Mw=86000, PDI=2.24) with a sulfonation degree of 60%, dissolve it in 35 g of N,N-dimethylacetamide (DMAc), and stir at 60°C until completely dissolved. After cooling and standing at room temperature, 1.077 g of ethylene glycol diacrylate, 0.2154 g of initiator TPO, and 8.7076 g of DMAc were added to the homogeneous solution. Stir at room temperature until completely dissolved, and pour the casting solution quickly onto a self-made dry and clean glass mold after standing still, such as figure 1 , with an initial thickness of 1600 μm. Put the mold into the ultraviolet cross-linking equipment quickly, and after treating it at a wavelength of 360nm for 5 minutes, immediately place the film in a vacuum drying oven and treat it at 60°C for 24 hours. After taking it out, the film was naturally detached from the glass plate under air conditions. The obtained membrane was soaked in ethanol and shaken 3 times, 3 hours each time. ...

Embodiment 2

[0042] Accurately weigh 5 g of sulfonated polysulfone (Mw=86000, PDI=2.24) with a sulfonation degree of 60%, dissolve it in 35 g of N’N-dimethylacetamide (DMAc), and stir at 60°C until completely dissolved. After cooling and standing at room temperature, 1.250 g of trimethylolpropane triacrylate, 0.2500 g of initiator TPO, and 8.5 g of DMAc were added to the homogeneous solution. Stir at room temperature until completely dissolved, and pour the obtained casting solution onto a self-made dry and clean glass mould, with an initial thickness of 1600 μm. Put the mold into the ultraviolet cross-linking equipment quickly, and after processing at 360nm wavelength for 5 minutes, immediately place the film in a vacuum drying oven and treat at 60°C for 24 hours. After taking it out, the film was naturally detached from the glass plate under air conditions. The obtained membrane was soaked in ethanol and shaken 3 times, 3 hours each time. Then it was washed three times with deionized w...

Embodiment 3

[0045] Accurately weigh 5 g of sulfonated polysulfone (Mw=86000, PDI=2.24) with a sulfonation degree of 60%, dissolve it in 35 g of N’N-dimethylacetamide (DMAc), and stir at 60°C until completely dissolved. After cooling and standing at room temperature, 1.115 g of pentaerythritol tetraacrylate, 0.023 g of initiator TPO, and 8.620 g of DMAc were added to the homogeneous solution. Stir at room temperature until completely dissolved, and pour the obtained casting solution onto a self-made dry and clean glass mould, with an initial thickness of 1600 μm. Put the mold into the ultraviolet cross-linking equipment quickly, and after treating it at a wavelength of 360nm for 5 minutes, immediately place the film in a vacuum drying oven and treat it at 60°C for 24 hours. After taking it out, the film was naturally detached from the glass plate under air conditions. The obtained membrane was soaked in ethanol and shaken 3 times, 3 hours each time. Then wash with deionized water three t...

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Abstract

The invention discloses a method for preparing sulfonated polysulfone cation exchange films different in three-dimension structure by regulating crosslinking functionality and application thereof. Themethod includes following steps: step 1, sufficiently removing impurities in sulfonated polysulfone, and dissolving sulfonated polysulfone into DMAc to prepare a homogeneous solution; step 2, addinga crosslinking agent and a photoinitiator in corresponding amount into the homogeneous solution obtained in the step 1, and stirring at room temperature to obtain a homogeneous casting film liquid; step 3, utilizing a tape casting method to pour the homogeneous casting film liquid onto a glass die to obtain a cast film; step 4, quickly performing ultraviolet treatment on the cast film, and performing vacuum drying immediately; step 5, after vacuum drying, enabling the film to naturally break away from the glass die in air, using alcohol to soak and vibrate an obtained film, and using deionizedwater to wash the obtained film to obtain a sulfonated polysulfone cation exchange film. The method is simple, effective and more conducive to commercialization; the cation exchange film has high ionexchange capacity, low swelling rate and excellent thermostability and presents high desalting rate when being applied in electrodialysis desalting.

Description

technical field [0001] The invention relates to the technical field of membrane material preparation and separation, in particular to a method for preparing sulfonated polysulfone cation exchange membranes with different three-dimensional structures by regulating the crosslinking functionality and its application in electrodialysis desalination. Background technique [0002] Ion transport efficiency is an important parameter of ion exchange membranes. In general, high ion exchange capacity leads to high water absorption, resulting in a decrease in the concentration of actually effectively immobilized ionic groups and instability in the three-dimensional structure. It is worth noting that, in addition to external factors such as ion channels on the ion exchange membrane, electric field, and temperature, immobilized ionic groups are one of the factors that determine ion selective permeation, rather than ion exchange capacity. [0003] The cross-linking process makes polymer m...

Claims

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Application Information

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IPC IPC(8): C08J5/22C08J7/12C08L81/06C08F283/00B01D61/42
CPCB01D61/422C08F283/002C08J5/2256C08J7/123C08J2381/06
Inventor 沈江南朱佳杰沈鹏鑫阮慧敏
Owner ZHEJIANG UNIV OF TECH
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