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Preparation method of alkaline anion exchange membrane

A basic anion, exchange membrane technology, applied in the direction of climate sustainability, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of weak cross-linking ability, reduce the conductivity of anion exchange membrane, etc., to improve mechanical properties , Improve physical and chemical stability, good thermal stability and alkali resistance

Active Publication Date: 2016-10-12
CHANGZHOU UNIV
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Problems solved by technology

[0003] Chinese patent 201010555682.4 discloses an anion-exchange membrane based on imidazole-based ionic liquids: the anion-exchange membrane is prepared by in-situ polymerization of monomers, imidazole-based ionic liquids, cross-linking agents and initiators; this method avoids the use of organic solvents, The thickness of the membrane is easy to control, and the water absorption and swelling degree of the anion exchange membrane can be adjusted by adjusting the content of the crosslinking agent divinylbenzene; the addition of the crosslinking agent divinylbenzene can improve the mechanical properties of the membrane but greatly reduce the anion exchange membrane. The conductivity of the exchange membrane
Chinese patent 201210212673.4 discloses an anion exchange membrane based on an ionic liquid crosslinking agent: the ionic liquid crosslinking agent plays a dual role in conducting ions in the anion exchange membrane and improving the mechanical properties of the anion exchange membrane; however, the olefin used in this system Propyl-based ionic liquid cross-linking agents have self-inhibiting polymerization, and the cross-linking ability is weak, so the mechanical properties of anion exchange membranes still need to be further improved

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  • Preparation method of alkaline anion exchange membrane
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Examples

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Embodiment 1

[0023] The present embodiment provides a kind of polymerized ionic liquid modified graphene oxide, and its preparation method comprises the following steps:

[0024] (1) 9.41g (0.10mol), 19.87gγ-chloropropyltrimethoxysilane (0.10mol) and 0.09g benzoquinone were added in 100ml anhydrous acetonitrile, and reflux reaction was carried out at 50°C for 30 hours; 5 times, drying after rotary evaporation to obtain polymeric ionic liquid

[0025] (2) Add the polymerized ionic liquid obtained in 2.0g step (1) and 2.0g graphene oxide to 100ml ethanol, add a small amount of ammonia water to adjust the mixed solution pH=2, filter after reacting at room temperature for 40 hours, and use After washing with water and ethanol for 3 times, and drying after rotary evaporation, the polymerized ionic liquid modified graphene oxide is obtained, and its chemical structure general formula is

[0026] Refer to Example 1 for the synthesis method of polymerized ionic liquid modified graphene oxid...

Embodiment 2

[0028] The present embodiment provides a kind of preparation method of basic anion exchange membrane, and it comprises the following steps:

[0029] (1) take Mix 0.006g, styrene 0.45g, acrylonitrile 0.14g, benzoin ethyl ether 0.006g, and crosslinking agent 0.012g, mix it under ultrasonic vibration for 3 minutes until uniform, apply it on the mold, and irradiate it with ultraviolet light with a wavelength of 250nm 30min, in situ polymerization to obtain a polymer film;

[0030] (2) Then soak the anion exchange membrane in 60°C, 1M KOH solution for 24 hours to convert anions into OH － , the OH obtained in this example － The ion conductivity of the type anion exchange membrane at room temperature is 1.10×10 -2 S cm -1 , the ionic conductivity at 90°C is 3.05×10 -2 S cm -1 , the tensile strength is 13.33Mpa, the Young's modulus is 393.57Mpa, and the elongation at break is 4.35%.

Embodiment 3

[0032] This example provides a method for preparing a basic anion exchange membrane, the preparation steps of which are basically the same as in Example 2, the difference is that the ratio of raw materials is different, specifically: styrene 0.44g, acrylonitrile 0.15g, polymer Type Ionic Liquid Modified Graphene Oxide 0.012g, benzoin ethyl ether 0.01g, crosslinking agent 0.02g, the OH obtained in this embodiment － The ion conductivity of the type anion exchange membrane at room temperature is 1.50×10 -2 S cm -1 , the ionic conductivity at 90°C is 3.55×10 -2 S cm -1 , the tensile strength is 16.67Mpa, the Young's modulus is 445.08Mpa, and the elongation at break is 4.54%.

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Abstract

The invention relates to a preparation method of an alkaline anion exchange membrane. The preparation method comprises the following steps: (1) mixing a polymer monomer, aggregate type ionic liquid modified oxidized graphene, a crosslinking agent, and an initiator according to the weight ratio of (60-95):(0.1-20):(0.1-15):(1-5) for in-situ polymerization to obtain a macromolecular membrane; (2) immersing the macromolecular membrane in an alkaline solution for anion exchange to obtain the alkaline anion exchange membrane. The aggregate type ionic liquid modified oxidized graphene is grafted to a polymer substrate through a chemical bond, so that the physical and chemical stability of the hybridized anion exchange membrane is improved; aggregate type ionic liquid is prepared into the anion exchange membrane, so that the ionic liquid is high in thermal stability and stable in chemical property; the prepared ionic liquid-based anion exchange membrane is higher in thermal stability and alkali resistance; the crosslinking agent is introduced to adjust the water absorption rate and the swelling degree of the anion exchange membrane; due to the formation of a crosslinking network, the mechanical property of the anion exchange membrane is greatly improved.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a preparation method of an anion exchange membrane, in particular to a preparation method of an alkaline anion exchange membrane. Background technique [0002] Alkaline anion exchange membrane is the core component of an alkaline anion exchange membrane fuel cell. It plays a dual role of conducting ions and blocking fuel. Its performance directly determines the performance and life of the fuel cell. The traditional quaternary ammonium salt polymer basic anion exchange membrane has disadvantages such as poor dimensional stability, high water absorption, large swelling degree, and poor mechanical properties; and the preparation of quaternary ammonium salt polymer requires a large amount of organic solvents, highly toxic chlorine Methyl ether is also an indispensable raw material. The later treatment of organic solvents not only increases the production cost, but also has great harm t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F212/08C08F220/44C08J5/18C09C1/46C09C3/08H01M8/1041H01M8/1069
CPCC08F292/00C08J5/18C08J2351/10C09C1/46C09C3/08H01M8/1041H01M8/1069C08F212/08C08F220/44Y02E60/50Y02P70/50
Inventor 林本才乔刚丁建宁储富强袁宁一冯天英
Owner CHANGZHOU UNIV
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