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Method for performing hydrophilic modification on surface of polyvinylidene fluoride microporous membrane

A technology of polyvinylidene fluoride and microporous membrane, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of uncertain hydrophilization effect and short retention time, and improve hydrophilicity , low cost, simple process effect

Inactive Publication Date: 2010-12-15
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simple plasma treatment, its hydrophilization effect is uncertain, and the retention time is short

Method used

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  • Method for performing hydrophilic modification on surface of polyvinylidene fluoride microporous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Wash the polyvinylidene fluoride microporous filter membrane with deionized water for 10 times, then soak it in 70% ethanol solution for 24 hours, and then immerse it in deionized water;

[0022] (2) The polyvinylidene fluoride film that above-mentioned process has been immersed in adding phase transfer catalyst is in the alkali / oxidant solution of tetrabutylammonium bromide, reacts 40min at 50 DEG C, wherein, alkali is potassium hydroxide, weight Percentage concentration is 20%; Oxidant is potassium permanganate, and weight percent concentration is 3%, and the concentration of tetrabutylammonium bromide is 3000mg / l;

[0023] (3) Soak the above-mentioned treated polyvinylidene fluoride film in sodium bisulfite containing sulfuric acid to remove potassium permanganate and potassium hydroxide on the surface, wash it with deionized water for 10 times, and dry it. The volume percent concentration of sodium bisulfite is 1%, and the weight percent concentration of sodium ...

Embodiment 2

[0026] (1) Wash the polyvinylidene fluoride microporous filter membrane with deionized water for 10 times, then soak it in 70% ethanol solution for 24 hours, and then immerse it in deionized water;

[0027] (2) The polyvinylidene fluoride film that above-mentioned processing is immersed in adding phase-transfer catalyst is in the alkali / oxidant solution of tetrabutylammonium bromide, reacts 60min at 60 DEG C, wherein, alkali is potassium hydroxide, weight The percentage concentration is 30%; Oxidant is potassium permanganate, and the weight percentage concentration is 2%, and the concentration of tetrabutylammonium bromide is 5000mg / l;

[0028] (3) Soak the above-mentioned treated polyvinylidene fluoride film in sodium bisulfite containing sulfuric acid to remove potassium permanganate and potassium hydroxide on the surface, wash it with deionized water for 10 times, and dry it. The volume percent concentration of sodium bisulfite is 2%, and the weight percent concentration of...

Embodiment 3

[0031] (1) Wash the polyvinylidene fluoride microporous filter membrane with deionized water for 10 times, then soak it in 70% ethanol solution for 24 hours, and then immerse it in deionized water;

[0032] (2) The polyvinylidene fluoride film that above-mentioned process has been immersed in adding phase transfer catalyst is in the alkali / oxidant solution of tetrabutyl ammonium bromide, reacts 50min at 40 DEG C, wherein, alkali is potassium hydroxide, weight Percentage concentration is 40%; Oxidant is potassium permanganate, and weight percent concentration is 3%, and the concentration of tetrabutylammonium bromide is 4000mg / l;

[0033] (3) Soak the above-mentioned treated polyvinylidene fluoride film in sodium bisulfite containing sulfuric acid to remove potassium permanganate and potassium hydroxide on the surface, wash it with deionized water for 10 times, and dry it. The volume percent concentration of sodium bisulfite is 2.5%, and the weight percent concentration of sodi...

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Abstract

The invention provides a method for performing hydrophilic modification on the surface of a polyvinylidene fluoride micro-porous membrane. The method is characterized by comprising the following specific steps of: cleaning a polyvinylidene fluoride micro-porous filter membrane with deionized water, dipping the cleaned filter membrane in solution of ethanol, dipping the dipped filter membrane in the deionized water, adding the polyvinylidene fluoride micro-porous membrane into solution of an alkali oxidant and reacting at the temperature of between 20 and 80 DEG C for 20 to 60 minutes, wherein the alkali oxidant contains alkali and potassium permanganate serving as an oxidant; dipping the polyvinylidene fluoride micro-porous membrane treated in the step one in solution of an acid reducing agent to remove the alkali and the potassium permanganate serving the oxidant on the surface, cleaning the dipped membrane with the deionized water and drying the cleaned membrane; and dipping the polyvinylidene fluoride micro-porous membrane treated in the step two in 5 to 20 volume percent solution of glycerin, reacting at normal temperature for 5 to 20 minutes, cleaning the membrane with the deionized water and drying the cleaned membrane. The method has the advantages of simple and efficient process, capability of improving the hydrophility of the polyvinylidene fluoride membrane and lasting effect.

Description

technical field [0001] The invention relates to a method for hydrophilic modification of the surface of a polyvinylidene fluoride microporous membrane, and belongs to the technical field of hydrophilic modification of the membrane surface. Background technique [0002] Membrane separation technology is a fluid separation unit operation technology represented by polymer separation membrane, and it is a new type of high-tech edge subject. Because membrane separation technology has many advantages that other separation technologies do not have: concentration does not require phase change, large separation coefficient, strong separation selectivity, and does not require evaporators or refrigeration equipment, so the investment cost is low and energy consumption is low; especially for those heat sensitive The processing of substances (such as food, medicine or bioengineering products), because the separation process is not heated, it is easy to protect the original color, aroma, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00
Inventor 高晶俞建勇黎聪
Owner DONGHUA UNIV
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