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Preparation method of heterogeneous anion exchange membrane

An anion exchange membrane, heterogeneous technology, applied in anion exchange, ion exchange, chemical instruments and methods, etc., can solve the problems of low membrane ion conductivity, complex preparation process, polluted environment, etc., to achieve high ion exchange capacity, high Effect of ionic conductivity, simple preparation method

Active Publication Date: 2013-04-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method has the following disadvantages that are difficult to overcome: (1) in the chloromethylation reaction, a large amount of sub-crosslinking of the methylene bridge is generated, resulting in poor product performance, high film resistance, poor mechanical properties, and low resistance. Pollution ability is poor; (2) toxic substances such as volatile chloromethyl ether, formaldehyde and hydrogen chloride are often used in the chloromethylation process, which seriously pollutes the environment, especially chloromethyl ether (especially dichloromethyl ether), which is a kind of Carcinogenic substances, harmful to the body, unsafe operation process, which limits the development of anion exchange membranes
(3) Substances such as trimethylamine and triethylamine are often used for quaternization in the amination process. These substances are possible carcinogens, have a foul smell, are difficult to eliminate, and seriously pollute the environment
The preparation process of this method is relatively complicated, and the organic solvent needs to be evaporated, which will cause serious pollution to the environment, and pyridinium salt is a weakly basic functional group, so the exchange capacity is limited
The ionic conductivity of the prepared membrane is low, only 0.008S / cm at room temperature

Method used

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  • Preparation method of heterogeneous anion exchange membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Prepare monomer slurry, take 99 parts by weight of polymerized monomer N-vinyl formamide (NVF), 1 part by weight of crosslinking agent divinylbenzene (DVB), 5 parts by weight of initiator benzoyl peroxide (BPO ), and mix evenly.

[0040] Cut out 10×10cm 2 PTFE porous membrane with a thickness of 10m, soaked in methanol solution, quickly immersed in the prepared monomer slurry components for a certain period of time, took out and wiped off the excess solvent on the surface, preheated on a hot stage at 80°C for 1min, covered on both sides A polyester sheet with a thickness of 100m is clamped in a clean glass plate. Put the glass plate on a hot stage at 80°C, and thermally polymerize it under a pressure of 0.3MPa for 5h.

[0041]The obtained film was carefully peeled off from the polyester sheet, immersed in 5mol / L NaOH aqueous solution, and hydrolyzed at 80°C for 10h. The hydrolyzed film is soaked in 30wt% iodomethane-ethanol solution at room temperature for 10 hours, ...

Embodiment 2

[0045] Adopt the same operation process as embodiment 1. The difference from Example 1 is that the ammonification conditions are changed, and the hydrolyzed film is immersed in a 30 wt% iodomethane-ethanol solution at room temperature for 22 hours.

[0046] The room temperature water content and ion exchange capacity of the anion exchange membrane prepared by this example were 267.2wt% and 1.43mmol / g-dry membrane, respectively.

[0047] Such as figure 2 As shown, 2928 and 1658cm -1 represent -CH respectively 2 Stretch vibration peak and -C=C stretch vibration peak in benzene ring, 1563 and 1383 cm -1 represent -NH respectively 2 Bending vibration peak and -C-N group stretching vibration peak, but this information does not appear in the base film PTFE, which can prove that the monomer enters the porous PTFE and successfully polymerizes; figure 2 1563cm of middle curve c -1 Office-NH 2 The bending vibration peak is obviously weaker than curve b, which can prove that -NH...

Embodiment 3

[0051] Adopt the same operation process as embodiment 1. The difference from Example 1 is that the thermal polymerization conditions are changed to: 120° C. hot stage, thermal polymerization under 0.3 MPa pressure for 3 hours.

[0052] The ion exchange capacity of the anion exchange membrane prepared in this example is 0.84mmol / g-dry membrane.

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Abstract

The invention discloses a preparation method of a heterogeneous anion exchange membrane. The preparation method of the heterogeneous anion exchange membrane comprises the following steps of: preparing aggregated monomer size, and soaking a porous film into the aggregated monomer size; forming a membrane polymer by thermal-initiated polymerization; and preparing the anion exchange membrane by ammonium after hydrolyzing in an alkaline solution. The heterogeneous anion exchange membrane is simple in preparation method, and low in cost, and does not pollute the environment; and the prepared membrane has high ion exchange capacity, high ionic conductance, small membrane thickness, and wide application prospect in the aspect of an alkaline fuel cell.

Description

technical field [0001] The invention relates to a preparation method of a heterogeneous anion exchange membrane. Background technique [0002] Anion exchange membranes are widely used in water treatment, material purification, concentration, separation, chlor-alkali industry, heavy metal recovery, alkaline anion exchange membrane fuel cells, liquid flow energy storage batteries, new supercapacitors, etc. Since the anion exchange membrane is more complicated and difficult to prepare than the cation exchange membrane, and it is most likely to be polluted by precipitation corrosion and organic substances in the electrodialysis process, which directly affects the life of the desalinator, so the development of anion exchange membrane is more special and Significance. [0003] At present, the common method for preparing anion exchange membranes is to polymerize or copolymerize monomers into polymers and then perform functionalization, which usually includes chloromethylation, qua...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08J5/22C08J5/24C08F26/02B01J41/14H01M8/02H01M2/16
CPCY02E60/12Y02E60/50
Inventor 俞红梅赵云邵志刚衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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