TiO2 / PVDF cross blend cation exchange membrane and preparation method

A cation exchange membrane and blending technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high water concentration diffusivity, large membrane salt diffusivity, and low membrane mechanical strength, etc. To achieve the effect of simple film forming process, improved hydrophilicity and increased preparation cost

Inactive Publication Date: 2007-12-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are common problems in cation exchange membranes: poor dimensional stability, high concentration diffusion coefficient of water, large salt diffusion coefficient of membrane, low mechanical strength of membrane, poor anti-pollution ability, etc.

Method used

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specific Embodiment approach 1

[0010] Specific embodiment one: the TiO of this embodiment 2 / PVDF blended cation exchange membrane is made of the following components by weight percentage: polyvinylidene fluoride (referred to as PVDF): 4-11wt.%, polypropylene: 1.4-4.6wt.%, cross-linking agent: 0.1-4wt. %, titanium dioxide particles: 0.04-0.44wt.%, organic solvents containing active groups: 79-95wt.%.

[0011] The addition of titanium dioxide particles in this embodiment improves the surface energy of the polyvinylidene fluoride cation exchange membrane, which increases the hydrophilicity of the membrane by 30%; the addition of titanium dioxide particles in this embodiment not only retains the polyvinylidene fluoride cation exchange membrane The original excellent performance also increases the mechanical strength of the membrane by 25%;

specific Embodiment approach 2

[0012] Specific implementation mode two: TiO in this embodiment mode 2 / PVDF blended cation exchange membrane is made of the following components by weight percentage: polyvinylidene fluoride: 6wt.%, polypropylene: 3wt.%, crosslinking agent: 1wt.%, titanium dioxide particles: 0.40wt.%, containing active Group organic solvent: 86wt.%.

specific Embodiment approach 3

[0013] Specific implementation mode three: TiO in this implementation mode 2 / PVDF blended cation exchange membrane is made of the following components by weight percentage: polyvinylidene fluoride: 5wt.%, polypropylene: 4.5wt.%, crosslinking agent: 0.5wt.%, titanium dioxide particles: 0.4wt.%, Organic solvent containing active groups: 84wt.%.

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Abstract

The invention publishes a method for producing the TiO2/PVDF blending positive ion exchange membrane, which involves a method for producing high polymer organic membrane. This invention enhances the water affinity of PVDF positive ion exchange membrane, the mechanical strength and anti-pollution capacity. The positive ion exchange membrane includes FI ethane, polypropylene, crosslinking agent, titanium dioxide grain and organic solvent with activity groups. This invention is as follows: a. dissolving the FI ethane and polypropylene in the organic solvent; B. joining crosslinking agent; C. filtering insoluble substance; D. joining titanium dioxide grain; E, mixing the solution well-proportioned and deaeration; F, creating membrane on the glass plate; G, drying, and solidifying. The TiO2/PVDF blending positive ion exchange membrane does not only retains the fine characteristic of FI ethane exchange membrane, but also improves the membrane surface energy,and enhances the water affinity, and increases the ability to repel outside pollutant.

Description

technical field [0001] The invention relates to a polymer organic membrane and a preparation method thereof. Background technique [0002] Electrodialysis is a kind of membrane separation technology. Under the action of a direct current electric field, with the potential difference as the driving force, the electrolyte is separated from the solution by using the selective permeability of the ion exchange membrane, so as to realize the desalination of the solution. For the purpose of concentration, refinement or purification. [0003] The ion exchange membrane is the main component of the electrodialyzer. It is a polymer membrane that contains ionic groups and has the ability to selectively permeate ions in the solution. Because its ion selective permeability is generally used in application, it is also called ion selective permeability membrane. According to its function and structure, it can be divided into five types: cation exchange membrane, anion exchange membrane, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D71/02C08J5/22
Inventor 于水利赵晴吕慧
Owner HARBIN INST OF TECH
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