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Method for preparing sulfonated polymer films

A technology of sulfonated polymer and membrane casting solution, which is applied in the field of preparation of sulfonated polymer membranes, can solve the problems of low polymer sulfonation degree and complicated membrane making process, achieve high water flux, simple preparation process, Effect of High Protein Retention

Inactive Publication Date: 2009-09-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The degree of sulfonation of the polymer used in this film-making method is relatively low, and it is necessary to prepare a dry sulfonated polymer first, then prepare a casting solution, and finally use a phase inversion method to make a film. The film-making process is relatively complicated.

Method used

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  • Method for preparing sulfonated polymer films
  • Method for preparing sulfonated polymer films

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Add 25 grams of dried polyether ether ketone and 220 ml of 98% concentrated sulfuric acid into a dry three-necked flask, stir, and immerse in a constant temperature water bath at 70°C. After reacting for 3 hours, quickly immerse the three-necked flask in an ice-water bath and keep stirring to stop the reaction. Stirring was stopped after 30 minutes. Keep this three-neck flask standing in an ice-water bath for 12 hours to degas the casting solution. Pour the casting solution on the glass plate to scrape the film at room temperature. At this time, adjust the height of the scraper to 200 μm from the glass plate. Immediately after scraping, put the glass plate into non-solvent deionized water to form a film. The temperature of the non-solvent coagulation bath is 5°C . After the membrane was completely detached from the glass plate, it was transferred to fresh deionized water and soaked for later use. The sulfonation degree of this membrane is 70%, and this porous separat...

Embodiment 2

[0024] Add 30 grams of dried phenolphthalein polyethersulfone and 150 ml of dichloroethane into a dry three-necked flask to dissolve completely, slowly add 12 ml of chlorosulfonic acid dropwise and stir, immerse in a constant temperature water bath at 40°C, and react After 5 hours, the three-neck flask was quickly immersed in an ice-water bath, and kept stirring to stop the reaction. Stirring was stopped after 30 minutes. Keep this three-neck flask standing in an ice-water bath for 12 hours to degas the casting solution. Pour the casting solution on the glass plate to scrape the film at room temperature. At this time, adjust the height of the scraper to 200 μm from the glass plate. Immediately after scraping, put the glass plate into a 2mol / L NaOH aqueous solution to form a film. The temperature of the non-solvent bath is 20 ℃. After the membrane was completely detached from the glass plate, it was transferred to fresh deionized water and soaked for later use. The sulfonati...

Embodiment 3

[0026] Add 30 grams of dried polyether ether ketone and 240 ml of 98% concentrated sulfuric acid into a dry three-necked flask, stir, and immerse in a constant temperature water bath at 50°C. After reacting for 4 hours, quickly immerse the three-necked flask in an ice-water bath In, and keep stirring, make reaction stop, add the graphene oxide of 0.5g simultaneously. Stirring was stopped after 60 minutes. Keep this three-neck flask standing in an ice-water bath for 12 hours to degas the casting solution. Pour the casting solution on the glass plate to scrape the film at room temperature. At this time, adjust the height of the scraper to 240 μm from the glass plate. Immediately after scraping, put the glass plate into 20°C deionized water to form a film. After the membrane was completely detached from the glass plate, it was transferred to fresh deionized water and soaked for later use. The degree of sulfonation of the membrane was 55%. This porous separation membrane is tes...

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Abstract

The invention discloses a method for preparing sulfonated polymer films, which comprises the following steps: preparing a casting solution and film-forming on the basis of phase-inversion. The sulfonation reaction is carried out between one or two of polyether-ether-ketone (PEEK), phenolphthalein polyaryl ether sulfone (PES-C) or polystyrene (PS) and concentrated sulfuric acid, fuming sulfuric acid or chlorosulfonic acid to obtain a sulfonated polymer solution in the preparation of the casting solution; and then, the film is directly formed on the basis of the phase-inversion method. The sulfonated polymer film prepared by the invention has higher pure water flux and protein retention rate, furthermore, the method has the advantages of good anti-pollution performance, higher mechanical strength and simple preparation process.

Description

technical field [0001] The invention relates to a preparation method of an asymmetric porous membrane characterized by materials, in particular to a preparation method of a sulfonated polymer membrane. Background technique [0002] Polymer separation membrane is a film made of polymer or polymer composite material with the function of separating fluid mixture. The membrane separation process is to use the separation membrane as a spacer layer. Under the driving force of pressure difference, concentration difference or potential difference, the components in the fluid mixture pass through the membrane at different rates, so that they are enriched on both sides of the membrane. In order to achieve the purpose of separation, purification, concentration and recycling. Membrane filtration technology is a technology that develops rapidly. While it is developing rapidly and being widely used, it also puts forward higher requirements for the performance of the separation membrane i...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L61/16C08L81/06C08L25/06B01D71/68B01D71/72B01D71/28
Inventor 王宇新杨伟许莉
Owner TIANJIN UNIV
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