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Preparation method for nano-fibre ion exchange membrane

A technology of ion-exchange membrane and nanofiber, which is applied in the field of preparation of nanofiber ion-exchange membrane, which can solve the problems of limiting the scope of use of ion-exchange membrane, not having a microporous structure, and being unfavorable for the passage of liquid water.

Active Publication Date: 2009-01-14
徐州博创建设发展集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of the cast film is that it does not have a certain amount of microporous structure.
It is not conducive to the passage of liquids such as water, which limits the scope of use of ion exchange membranes

Method used

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  • Preparation method for nano-fibre ion exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] PVDF with a molecular weight of 800,000 was dissolved in a mixed solvent of DMF and acetone, the weight concentration of PVDF was 8%, and the volume ratio of DMF and acetone was 6:4. Electrospinning was performed using the electrospinning film-making device described in Application No. (Invention) 200710000533.X, and the electrospinning temperature was controlled at 20-30°C. Cut the prepared nanofibers into 5 cm segments, immerse in KOH ethanol solution with a concentration of 1 mol / L, and treat for 30-120 minutes under the protection of nitrogen to partially dehydrofluoride PVDF molecules to form double bonds. Take it out, wash it with water until neutral, dry it, and put it into a tetrahydrofuran solution of styrene, and the volume of styrene is 50% of the total volume of the solution. Stir simultaneously under the protection of nitrogen for 10 minutes, then add 0.3g / 100ml benzoyl peroxide (initiator), and carry out grafting reaction below 75°C for 10 hours. Filtrate...

Embodiment 2

[0015] Dissolve PVDF with a molecular weight of 800,000 in a mixed solvent of DMF and acetone in the same ratio as before, the weight concentration of PVDF is 8%, and the volume ratio of DMF and acetone is 6:4. Electrospinning is carried out by using the electrospinning film-making equipment mentioned above, and the electrospinning temperature is controlled at 20-30°C. Obtain PVDF nanofibers, and through the same grafting treatment as in Example 1, obtain PVDF-PS graft copolymers. Soak PVDF-PS in excess chloromethyl methyl ether, add anhydrous aluminum trichloride, and react at 40°C for 4-6 hours to obtain chloromethylated PVDF-PS graft copolymer. After the amination treatment, the nanofiber anion exchange membrane is prepared by electrospinning with the same solvent system solution. According to the application requirements, the film thickness can be controlled at 10-100 microns.

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Abstract

The invention discloses a preparation method of a nano-fiber ion exchange membrane, the preparation methodis completely different from the conventional preparation method, in fact, which is a method for preparing high milecular nano-fiber ion exchange membrane through using an electrostatic spinning. The method is mainly comprises four steps: firstly, PVDF is made into the nanometer fiber through the electrostatic spinning method; secondly, the PVDF nanometer fiber is grafted by styrene; thirdly, the sulphonated treatment or the amidocyanogen treatment is performed to the grafted PVDF; fourthly, the product of the third step is made into the nano-fiber ion exchange membrane by using the electrostatic spinning method again. The preparation methodcan also be used for preparing the bipolar membrane. The PVDF-PS nano-fiber anion and cation exchange membrane prepared by the method has the advantages that the porosity ratio,is high, and the PVDF-PS nano-fiber anion and cation exchange membrane can not be distorted in water and has a high temperature resistant performance. The preparation method can be extensively applied in the fields such as the sewage treatment, the fueling battery diaphragm and the seawater desalination and the like.

Description

technical field [0001] The invention relates to a method for preparing a nanofiber ion-exchange membrane, and proposes a scheme for preparing a polymer nanofiber ion-exchange membrane by an electrospinning method. Background technique [0002] Anion and cation exchange membranes are widely used in many fields, such as sewage treatment, seawater desalination, energy field, chemical industry and so on. The conventional preparation method of anion-and-cation exchange membranes is: firstly, the corresponding polymer liquid containing phenyl is cast to form a membrane, and then sulfonated to form a cation-exchange membrane; if the membrane is chloromethylated and then aminated, it is produced anion exchange membrane. In order to prepare an ion exchange membrane suitable for fuel cells, a scheme was proposed in the "Journal of Functional Polymers, 2004 Vol.17 P452-456". In this scheme, a polyvinylidene fluoride (PVDF) solution is cast to form a membrane, and then styrene is used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22B01D67/00B01D71/76
Inventor 刘冉
Owner 徐州博创建设发展集团有限公司