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A kind of homogeneous cation exchange membrane and its preparation method

A cation exchange membrane and film-forming technology, applied in the field of homogeneous cation exchange membrane and its preparation, can solve the problems of poor oxidation resistance, high fuel permeability, high price, etc., and achieve good thermal stability and chemical stability. , The steps are simple, and the effect of reducing the harm to the human body and the environment

Active Publication Date: 2020-05-12
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the most widely used cation exchange membrane is the perfluorosulfonic acid membrane (Nafion) produced by DuPont, but the disadvantages of high price, high fuel transmission rate, and poor oxidation resistance limit the application and development of Nafion membrane.

Method used

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  • A kind of homogeneous cation exchange membrane and its preparation method
  • A kind of homogeneous cation exchange membrane and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) After cleaning the basement film (polyethylene film), put it in a vacuum drying oven and dry it to constant weight, then put the basement film into an irradiation bottle, and put it into a cobalt source irradiation chamber to irradiate to a total dose of 30kGy .

[0053] (2) The membrane after irradiation is placed in the reactor, soak the membrane in the toluene solution of 30% styrene, feed nitrogen to get rid of the air in the reactor, then seal it, and put the reactor at a constant temperature of 60°C The reaction was carried out in a water bath for 2 hours, so that the membrane was grafted with styrene monomer. After the reaction, remove the residual monomer solution and homopolymer in the film, and dry it for future use.

[0054] (3) Put the grafted membrane into the reactor again, and react with a sulfonating reagent (2% chlorosulfonic acid in dichloromethane solution), the reaction temperature is room temperature, and the reaction time is 1 h. Subsequently...

Embodiment 2

[0059] (1) After cleaning the basement film (polyethylene film), put it in a vacuum drying oven and dry it to constant weight, then put the basement film into an irradiation bottle, and put it into a cobalt source irradiation chamber to irradiate to a total dose of 50kGy .

[0060] (2) The irradiated film is placed in the reactor, soaked in the toluene solution of 30% styrene, nitrogen gas is passed into the reactor to get rid of the air in the reactor, then it is sealed, and the reactor is placed at a constant temperature of 80°C The reaction was carried out in a water bath for 1 h, so that the membrane was grafted with styrene monomer. After the reaction, remove the residual monomer solution and homopolymer in the film, and dry it for future use.

[0061] (3) Put the grafted membrane into the reactor again, and react with a sulfonating reagent (2% chlorosulfonic acid in dichloromethane solution), the reaction temperature is room temperature, and the reaction time is 4 hours...

Embodiment 3

[0066] (1) Clean the basement film (polyvinylidene fluoride 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 chamber to irradiate to the total dose It is 70kGy.

[0067] (2) The membrane after irradiation is placed in the reactor, soak the membrane in the toluene solution of 30% styrene, feed nitrogen to get rid of the air in the reactor, then seal it, and put the reactor at a constant temperature of 70°C The reaction was carried out in a water bath for 1.5 hours, so that the membrane was grafted with styrene monomer. After the reaction, remove the residual monomer solution and homopolymer in the film, and dry it for future use.

[0068] (3) Use the grafted film to clamp the unirradiated polyvinylidene fluoride film in the middle, and attach nylon mesh cloth on the upper and lower sides of the diaphragm, and put it between two stainless steel plates of the tab...

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Abstract

The invention provides a homogenous phase cation exchange membrane and a preparation method thereof and relates to functional macromolecular membrane materials. The preparation method comprises the following steps: taking a macromolecular thin film sensitive to high-energy ray as a substrate film; after washing and radiating through high-energy rays, grafting a monomer styrene or an alkyl styrene monomer to two sides of the substrate film and carrying out functionalization on the monomer styrene and the alkyl styrene monomer; introducing cation exchange groups on two side faces of the membrane; pelleting again or adopting a method of carrying out co-fusion on a macromolecular thin film which is not radiated to obtain the homogenous phase cation exchange membrane. The homogenous phase cation exchange membrane prepared by the preparation method has the characteristics of high exchange capacity, good electrochemical performances, high flexibility and relatively high strength and the like, and has a wide application prospect in national economy branches including food industry, electronic industry, semiconductor industry, medicine industry, dyeing and printing industry, chemical industry and the like; the cation exchange membrane has an excellent alcohol resisting performance and the problem that methanol leaks from an anode film in a utilization process of a direct methanol fuel cell is solved.

Description

technical field [0001] The invention relates to a functional polymer membrane material, in particular to a homogeneous cation exchange membrane and a preparation method thereof. Background technique [0002] Ion-exchange membrane, as a kind of polymer material that can selectively pass ions, has received a lot of attention in recent years due to its advantages of environmental protection, no pollution, high efficiency and energy saving, and easy formation of modules in the process of preparation and application. In the past few decades, ion exchange membrane technology has been widely used in electrodialysis, diffusion dialysis, chlor-alkali industry and fuel cells and other fields. However, the development of ion-exchange membranes is greatly limited due to the problems of high price, poor tolerance, and serious membrane fouling. Therefore, the development of a membrane with good chemical stability, low price, low swelling and high ion exchange capacity is of great signifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/78B01D69/02B01D67/00C08J5/22C08J7/16
CPCB01D67/0006B01D69/02B01D71/78B01D2325/42C08J5/2243C08J7/16C08J2323/06C08J2323/12C08J2327/16
Inventor 赵金保张斯泽王静
Owner XIAMEN UNIV
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