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Method for preparing homogeneous phase strong alkali anion exchange membrane by radiation grafting method

A technology of anion exchange membrane and radiation grafting, which is applied in the field of preparation of homogeneous strong basic anion exchange membrane, can solve the problems of electrochemical performance such as the decrease of electrical conductivity and ion selectivity, and achieve the purpose of increasing preparation cost and membrane resistance. Low, high ion selectivity effect

Inactive Publication Date: 2010-06-16
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chloromethylation is required in the process of introducing ion exchange groups, and this process requires the use of highly toxic carcinogen chloromethyl ether. In addition, the reinforcing material will reduce the electrochemical performance of the membrane, such as conductivity and ion selectivity.

Method used

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  • Method for preparing homogeneous phase strong alkali anion exchange membrane by radiation grafting method
  • Method for preparing homogeneous phase strong alkali anion exchange membrane by radiation grafting method
  • Method for preparing homogeneous phase strong alkali anion exchange membrane by radiation grafting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) First prepare the graft liquid reaction solution of the different grafting monomer concentrations of the volume ratio GMA: DMF=5: 95, 10: 90, 15: 85, 20: 80, 25: 75, 30: 70, and add Inhibitor copper sulfate, its weight percentage concentration is 0.015%.

[0019] (2) Then the polyethylene film is cleaned with acetone and dried to constant weight, and the weighed film is respectively placed in the above-mentioned containers containing grafting reaction solutions with different monomer concentrations, and vacuumized to remove the reaction solution. Dissolved oxygen in the solution is placed in a cobalt source chamber for irradiation after sealing; the total irradiation dose is 5-20kGy, and the irradiation dose rate is 1.5kGy / h, and the grafting rates of the obtained grafted films are respectively: 5kGy, 52%; 10kGy, 61.2%; 15kGy, 66.3%; 20kGy, 67.8%. The mensuration of graft rate (G) adopts weighing method, and calculation formula is as follows: (Note: W in the form...

Embodiment 2

[0021] Example 2: The grafted film obtained in Example 1 with a graft rate of 72.6% is immersed in a 33% trimethylamine aqueous solution to introduce an anion exchange group, and the reaction times are 1, 3, 5, and 7 , 10 hours, the reaction temperature was 50°C, and the reaction was carried out under stirring. According to the amount of trimethylamine introduced into the grafted membrane at different reaction times, the ion exchange capacity of the prepared homogeneous membrane was calculated. figure 2 is the corresponding relationship between the ion exchange capacity of the homogeneous membrane and the amination time. The exchange capacity was determined by titration. (For the specific method, please refer to the national standard: GB / T 5760-2000, Hydrogen-oxygen type strong anion exchange resin exchange capacity determination method)

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Abstract

The invention relates to a method for preparing a homogeneous phase strong alkali anion exchange membrane by a radiation grafting method. The method comprises the following steps: dissolving glycidyl methacrylate in N,N-dimethylformamide to prepare a solution with the concentration of 5-30% in percentage by volume; adding polymerization inhibitor copper sulfate to form a grafting reaction solution; immersing a high-density polyethylene film into the grafting reaction solution; desorbing dissolved oxygen in the grafting reaction solution; placing into cobalt source for mutual irradiation grafting after being sealed to obtain a grafting membrane, wherein, the total irradiation dose is 5-20 kGy, the irradiation dose rate is 1.5 kGy / h (the value is fixed); taking out the grafting membrane; immersing into trimethylamine aqueous solution with the concentration of 33% in percentage by mass; reacting for 1-10h at the temperature of 5 DEG C while stirring; taking out the sample after ammoniation reaction, washing with water and drying to obtain the homogeneous phase strong alkali anion exchange membrane. The method of the invention not only can flexibly control homogeneous membrane anion exchange capacity, and the preparation method is easy to operate, has no toxicity and environmental pollution.

Description

technical field [0001] The invention relates to a method for preparing a homogeneous strongly basic anion exchange membrane, in particular to a method for preparing a homogeneous strongly basic anion exchange membrane by adopting a radiation grafting method to functionalize a high-density polyethylene film. technical background [0002] Anion exchange membranes have been widely used in various industrial fields, such as: concentration or desalination of salt solution by electrolysis, as a diaphragm for electrolyte electrolysis in the chlor-alkali industry, acid recovery from waste acid, as an anion selective electrode, as a battery diaphragm, etc. . [0003] Currently commercialized homogeneous anion exchange membranes are mostly prepared by chemical initiator-induced copolymerization. The specific method is: paste styrene, divinylbenzene and other ingredients on the polyvinyl chloride or polypropylene reinforced net, then heat to prepare the base film, and then introduce a...

Claims

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Application Information

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IPC IPC(8): C08J7/18C08J5/22C08J7/12
Inventor 俎建华张剑秋罗文芸严峰夏敏
Owner SHANGHAI UNIV
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