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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 membranes should meet the following requirements: small membrane thickness and high strength, low resistance, high current density resistance, H + and OH - It has the characteristics of high permeation selectivity, heat resistance, pollution resistance and long life, but the current bipolar membrane cannot solve the above problems well.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] With benzophenone 2%, composite initiator 1173 (2-methyl-2 hydroxy-1-phenyl-1-acetone) 1%, crosslinking agent NPGDA (neopentyl glycol diacrylate) 3%, acrylic acid - 30% of 2-hydroxyethyl ester, the rest is glycidyl methacrylate (GMA), and the reaction solution is prepared. The polyethylene lithium-ion battery separator is used as a carrier, and the anion exchange layer is obtained by using a dip-coating process, reacting under a high-pressure mercury lamp for 3 minutes, and immersing the membrane in a trimethylamine solution overnight.

[0041] With benzophenone 2%, TPO (2,4,6-tribenzoyl-diphenylphosphine oxide) concentration 0.5%, cross-linking agent NPGDA (neopentyl glycol diacrylate) 2%, the rest is acrylic acid , made into a 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 is obtained. A bipolar membrane structure is forme...

Embodiment 2

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

Embodiment 3

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

[0046] Benzophenone 2%, TPO concentration 1.5%, crosslinking agent divinylbenzene 3%, the rest is 4-vinylpyridine, is made into reaction solution, is coated on one side of the cation exchange membrane that obtains in the previous step, high pressure React under a mercury lamp for 2 minutes to obtain a weak anion exchange layer and form a bipolar membrane structure. The thickness of the obtained bipolar membrane is 100 microns. 2 , the voltage drop is 1.5-2.0V, and 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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