Single slice type ambipolar ion-exchange membrane and preparation method thereof

An ion exchange membrane and ion exchange technology, applied in the field of monolithic bipolar ion exchange membrane and its preparation, can solve the problems of decreased ion transfer capacity, low operating current density, low bonding strength, etc., and achieve easy continuous operation , simple preparation method and process, low cost effect

Inactive Publication Date: 2009-08-05
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) Physical combination, the bonding strength of the anion and cation exchange layers is low, and it is easy to peel off
[0009] (2) The ion transfer capacity in the bipolar membrane is reduced, the resistance of the membrane is large, the operating current density is low, and the application is limited
[0010] High-performance bipolar

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] Example 1

[0040] With benzophenone 2%, composite initiator 1173 (2-methyl-2-hydroxy-1-phenyl-1-propanone) 1%, cross-linking agent NPGDA (neopentyl glycol diacrylate) 3%, acrylic acid -30% of 2-hydroxyethyl ester, and the rest is glycidyl methacrylate (GMA) to prepare a reaction solution. Taking polyethylene lithium ion battery separator as carrier, adopting dip coating process, reacting under high pressure mercury lamp for 3 minutes, then immersing the membrane in trimethylamine solution overnight to obtain an anion exchange layer.

[0041] With benzophenone 2%, TPO (2,4,6-tribenzoyl-diphenylphosphine oxide) concentration 0.5%, cross-linking agent NPGDA (neopentyl glycol diacrylate) 2%, the rest are acrylic acid , dubbed the reaction solution. The reaction solution was applied to one side of the obtained anion exchange membrane and reacted under a high pressure mercury lamp for 2 minutes. A cation exchange layer was obtained. A bipolar membrane structure is formed...

Example Embodiment

[0042] Example 2

[0043] The reaction solution in Example 1 was coated on commercial unipolar ion exchange membranes (anion exchange membrane JAM-I-10, cation exchange membrane JCM-I-10), respectively, and the corresponding bipolar membranes were obtained by the reaction. . The obtained bipolar film has a film thickness of 120 microns and a current density of 200 mA / cm 2 When the voltage drop is 1.5 ~ 2.0V, the stability is good.

Example Embodiment

[0044] Example 3

[0045] 2% of benzophenone, 1% of compound initiator 1173, 30% of sulfonated styrene, 20% of TMPTA, and the rest are acrylic acid to prepare a solution. A cation exchange membrane layer is obtained by using a polyethylene lithium ion battery separator as a carrier, adopting a dip coating process, and reacting under a high pressure mercury lamp for 2 minutes.

[0046] Benzophenone 2%, TPO concentration 1.5%, cross-linking agent divinylbenzene 3%, and the rest are 4-vinylpyridine, prepare a reaction solution, apply it to one side of the cation exchange membrane obtained in the previous step, high pressure The reaction was carried out under a mercury lamp for 2 minutes to obtain a weak anion exchange layer and a bipolar film structure was formed. The thickness of the bipolar film obtained was 100 microns. 2 When the voltage drop is 1.5 ~ 2.0V, the stability is good.

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Abstract

The invention relates to a uniwafer type bipolar ion exchange membrane and a method for preparing the same. An anion exchange layer and a cation exchange layer of a bipolar membrane are combined on two sides of the same carrier material respectively or the same side of a uniwafer type ion exchange membrane. The preparation method comprises the following steps that: a, according to certain proportion, an evocating agent, a functional monomer, a comonomer, a crosslinking agent and other additional compositions are prepared into a reaction solution of the corresponding ion exchange layer; and b, according to different carriers, the method carries out single side or double side coating treatment, that is the reaction solution is coated on the carrier material with certain thickness; the carrier material is positioned in an ultraviolet source and is radiated so that the carrier material is cured to obtain the ion exchange layer of one side; the other side of the ion exchange layer is coated with another reaction solution, positioned in the ultraviolet source and is radiated and cured, and according to requirements, cured membrane is positioned in a corresponding ionized treating solution and treated to obtain an ion exchange layer; and the bipolar membrane of the uniwafer type ion exchange layer is finally obtained. The voltage drop of two sides of the membrane is reduced; and the method has low cost and rapid reaction speed and is simple and feasible.

Description

technical field [0001] The invention relates to the preparation of a bipolar membrane in a membrane separation material, in particular to a monolithic bipolar ion exchange membrane and a preparation method thereof. Background technique [0002] Bipolar ion exchange membrane (commonly called bipolar membrane) is a new type of ion exchange membrane that has emerged rapidly in recent years. Unlike conventional unipolar ion exchange membranes, it consists of an anion exchange layer and a cation exchange layer that are closely adjacent or combined. Formed, the positive membrane side can selectively pass through cations, and the negative membrane side can selectively pass through anions. This anion-yang membrane composite structure of the bipolar membrane endows it with special properties. Under the action of a DC electric field, water is directly dissociated into H in the very thin interlayer interface region of the anion and cation exchange layers. + and OH - , due to the dif...

Claims

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Application Information

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IPC IPC(8): B01D69/12C08J5/22
Inventor 杨彪
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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