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Method for preparing bipolar film by self-assembling technology

A bipolar membrane and anion membrane technology, applied in the field of preparation of ion-exchange composite membranes, can solve problems such as no reports on the technology, and achieve the effects of improving the speed of dissociating water, improving work efficiency, and reducing costs

Inactive Publication Date: 2007-07-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] At present, there are a lot of materials reporting bipolar membrane preparation technology and self-assembly technology separately, but the technology combining the two has not been reported yet.

Method used

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  • Method for preparing bipolar film by self-assembling technology
  • Method for preparing bipolar film by self-assembling technology
  • Method for preparing bipolar film by self-assembling technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0045] Embodiment 2. 4.5meq / g anion resin powder with ion exchange capacity and 3.6meq / g cationic resin powder with ion exchange capacity are mixed with polyvinyl alcohol according to the mass ratio of 1: 1 respectively, and stir at 90 ℃ to make polyethylene Alcohol dissolved, anion and cation resin powder dispersed evenly. The membrane solution was left at room temperature for 24 h to remove air bubbles. Spread the negative membrane solution on the prepared flat glass, and let it stand at room temperature for 24 hours to remove air bubbles. The aqueous solution of polyacrylic acid with a mass concentration of 25% is diluted with absolute ethanol to a mass concentration of 2.265%. Place the anion film prepared above in this solution for 30 seconds, the negatively charged polyacrylic acid anion is adsorbed on the surface by the positively charged anion film according to a certain structure, take out the film, and let it stand at room temperature for 20 minutes to evaporate the...

Embodiment 3

[0047] Embodiment 3. Using the steps of Example 2, the self-assembly time is 60s to prepare bipolar membrane 2#. By means of the device in Fig. 3, a bipolar membrane voltage-current density curve is obtained. As shown in Figure 6.

[0048] It can be concluded from Figure 6 that when the voltage is 1.25V, the current density is 88.9mA / cm2; when the current density is 100mA / cm2, the voltage is 1.28V.

Embodiment 4

[0049] Example 4: Mix the anion resin powder with an ion exchange capacity of 4.5meq / g and the cationic resin powder with an ion exchange capacity of 3.6meq / g with polyvinyl alcohol in a mass ratio of 0.5:1, and stir at 90°C to make the polyethylene Alcohol dissolved, anion and cation resin powder dispersed evenly. The membrane solution was left at room temperature for 24 h to remove air bubbles. Spread the negative membrane solution on the prepared flat glass, and let it stand at room temperature for 24 hours to remove air bubbles. The aqueous solution of polyacrylic acid with a mass concentration of 25% is diluted with absolute ethanol to a mass concentration of 2.265%. Place the anion film prepared above in this solution for 30 seconds, the negatively charged polyacrylic acid anion is adsorbed on the surface by the positively charged anion film according to a certain structure, take out the film, and let it stand at room temperature for 20 minutes to evaporate the solvent....

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Abstract

The invention pertains to a method using self-assembling technology to prepare double-polar film. It relates to the preparation of ion exchange compound film in electrodialysis technology. The invention uses ion exchange resin specks as ion exchange materials, PVA as the basic preparation material, polyelectrolyte PAA as middle-layer material. It firstly puts the negative film containing non-crosslinked anion exchange resin in the ethanol solution, absorbs one or several layers of PAA solution through self-assembling, lay positive film on PAA after volatilization of the solution, acetalize the formaldehyde solution after filming. The invention integrates the negative and the positive films through self-assembling. The middle-layer PAA not only combines negative and positive films through esterification reaction to avoid the defect of single film surface and improve the stability double-polar film, but also plays catalyzing function to increase water dissociation speed of the double-polar film in order to improve the working efficiency.

Description

technical field [0001] The invention relates to a preparation method of an ion-exchange composite membrane used in electrodialysis technology, and belongs to the technical field of polymer materials. Background technique [0002] Bipolar membrane is a new type of ion exchange composite membrane composed of cation exchange layer (positive membrane) and anion exchange layer (negative membrane) [Friedrich Georg Wilhelm.Bipolar membrane electrodialysis, Ph.D.Thesis, Twente University Press , Enschede, The Netherlands, 13-16, 2001]. As shown in Figure 1, under the action of a DC electric field, the middle layer of the bipolar membrane 1 dissociates water into H + and OH - , so it is used in conjunction with common anion exchange membrane 2 and cation exchange membrane 3 to dissociate the salt in material chamber 5 and generate corresponding acid-base in acid chamber 4 and alkali chamber 6. The outstanding advantages of this new type of membrane process are that the process is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12C08J5/22
Inventor 余立新王军
Owner TSINGHUA UNIV
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