Single-sheet type bipolar membrane and preparation method thereof

A bipolar membrane and monolithic technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of low chemical stability and thermal stability of functional groups, reduce operation steps, limit the scope of use, etc. Achieve good thermal stability and chemical stability, good thermal stability and chemical stability, save the effect of film forming process

Inactive Publication Date: 2016-08-10
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this preparation method mainly include: 1) because the polymer base film is introduced into polystyrene through the method of soaking and polymerizing for many times, the operation steps are very complicated and the reproducibility is low; 2) the chloromethylation process of this method Chloromethyl ether and other strong carcinogenic chemicals are used in the drug, causing great harm to the environment and human body
Chinese patents CN201010281997.4 and CN201510260096.X have been improved on this basis, wherein Chinese patent CN201010281997.4 adopts a binary blended alloy film of polyethylene and ethylene and octene copolymer elastomer or polyethylene and ethylene and octene The ternary blended alloy film of ethylene copolymer elastomer and polyisobutylene rubber is used as the base film, the crystallinity of the base film is reduced, and a base film with a higher impregnation rate can be obtained after soaking for several hours at a temperature from room temperature to 40 °C , followed by sulfonation, chloromethylation and quaternization on both sides of the membrane to prepare a monolithic bipolar membrane. This method reduces operating steps to a certain extent and can obtain a substrate with a higher impregnation rate. Membrane, so that the final bipolar membrane has a higher ion exchange capacity, but the chloromethylation process still needs to use strong carcinogenic chemicals such as chloromethyl ether, and the bipolar membrane obtained by this method has a chemical Stability and mechanical properties still need to be improved
Chinese patent CN201510260096.X uses polyolefin films as the base film, adopts the method of co-irradiation grafting, grafts styrene on the base film, and then sulfonates, chloromethylates and quaternizes on both sides of the film respectively , to obtain a monolithic bipolar membrane

Method used

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  • Single-sheet type bipolar membrane and preparation method thereof
  • Single-sheet type bipolar membrane and preparation method thereof
  • Single-sheet type bipolar membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] (1) Clean the basement membrane (ethylene-tetrafluoroethylene copolymer film) and put it in a vacuum drying oven to dry to constant weight, then put the basement membrane into an irradiation bottle and put it in a cobalt source irradiation chamber for irradiation To a total dose of 100kGy.

[0048] (2) The irradiated membrane is placed in the reactor, so that one side of the membrane is soaked in the positive grafted monomer solution, and the other side is soaked in the negative grafted monomer solution, and the membrane separates the two monomers Open it, blow nitrogen into the reactor to remove the air in the reactor, then seal it, put the reactor into a constant temperature water bath at 60°C for 2 hours, so that the two sides of the membrane are grafted with different monomers. The grafting monomer solution on the positive side is a toluene solution of 30% styrene; the grafting monomer solution on the negative side is an aqueous solution of 85% vinylimidazole. Afte...

Embodiment 2

[0057] (1) Clean the basement membrane (polyvinylidene fluoride film) and put it in a vacuum drying oven to dry to constant weight, then put the basement membrane into an irradiation bottle, and put it into a cobalt source irradiation chamber to irradiate to the total dose is 100kGy.

[0058] (2) The film after irradiation is placed in the reactor, one side of the film is soaked in the positive grafting monomer solution, the other side is not soaked in the solution, and nitrogen gas is fed to get rid of the air in the reactor, and then sealed, The reactor was placed in a constant temperature water bath at 80°C to react for 1 hour, and the positive side grafting reaction was carried out on one side of the membrane. The positive side grafting monomer solution is 30% styrene in toluene solution. After the reaction, remove the residual monomer solution and homopolymer in the film, and dry it for future use.

[0059](3) Put the film into an irradiation bottle again, and put it in...

Embodiment 3

[0066] (1) Clean the basement film (polyethylene film) and put it in a vacuum drying oven to dry to constant weight, then put the basement film into an irradiation bottle, and put it into a cobalt source irradiation room to irradiate to a total dose of 20kGy .

[0067] (2) The irradiated membrane is placed in the reactor, so that one side of the membrane is soaked in the positive grafted monomer solution, and the other side is soaked in the negative grafted monomer solution, and the membrane separates the two monomers After opening, nitrogen gas was introduced to remove the air in the reactor, and then sealed, and the reactor was placed in a 40°C constant temperature water bath to react for 24 hours, so that the two sides of the membrane were grafted with different monomers. The grafting monomer solution on the positive side is a toluene solution of 30% p-methylstyrene; the grafting monomer solution on the negative side is an aqueous solution of 60% allyl alkenylimidazole. Af...

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Abstract

A monolithic bipolar membrane and a preparation method thereof relate to functional polymer membrane materials. The monolithic bipolar membrane includes a cation exchange layer and an anion exchange layer. Preparation method 1: basement membrane pre-irradiation; simultaneous grafting on both sides; sulfonation; quaternization. Preparation method two: basement membrane pre-irradiation; double-sided step-by-step grafting; sulfonation; quaternization. The preparation of bipolar membranes by radiation grafting technology not only saves the film-forming process in the traditional bipolar membrane preparation process, but also does not need to add initiators and catalysts during the grafting process, and the prepared bipolar membranes are very uniform and pure. The steps are simple, and the thermal stability and chemical stability of the film are better. Even if it is used for a long time, there will be no problems such as bubbling and cracking in the middle interface layer that are easy to occur during the use of composite bipolar membranes. Good mechanical properties, thermal stability and chemical stability. Avoid the use of strong carcinogenic reagents such as chloromethyl ether, and reduce the harm to the human body and the environment.

Description

technical field [0001] The invention relates to a functional polymer membrane material, in particular to a monolithic bipolar membrane and a preparation method thereof. Background technique [0002] Bipolar membrane is a special ion exchange membrane, which is composed of anion exchange layer and cation exchange layer, and has a wide range of applications in pollution control, resource recovery, life science, environmental science, energy and many other fields. At present, there are mainly two types of bipolar membranes: composite type and monolithic type. The preparation methods mainly include: 1) hot pressing forming method of anion and cation exchange membrane layers; 2) adhesive forming method of anion and cation exchange membrane layers; 3) one 4) The method of introducing anion and cation exchange groups on both sides of the base film respectively; 5) The method of electrodeposition forming of one film layer on the other film layer. [0003] Radiation grafting technol...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D67/00B01D61/44B01D71/78C08J5/22B01J43/00
CPCB01D69/02B01D61/445B01D67/0006B01D71/78B01D2323/34B01D2323/385B01D2325/42B01J43/00C08J5/2231C08J5/2237C08J5/2243C08J5/225
Inventor 方军官英杰赵金保
Owner XIAMEN UNIV
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