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Chemical modification technique for microfiltering separation film of polyvinylidene fluoride

A polyvinylidene fluoride, chemical modification technology, applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., to achieve the effect of improving hydrophilic properties, expanding application fields, and simple operation

Inactive Publication Date: 2006-05-17
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using the chemical grafting technology described in the present invention, on the surface of polyvinylidene fluoride hollow fiber separation membrane and flat membrane, graft hydroxyl groups with hydrophilic properties and carboxylic acid groups with both hydrophilic and ion exchange properties research applications have not yet been reported

Method used

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  • Chemical modification technique for microfiltering separation film of polyvinylidene fluoride

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Embodiment Construction

[0024] The specific chemical modification methods of polyvinylidene fluoride polyvinylidene fluoride hollow fiber micro-membranes and flat-plate membranes are:

[0025] 1) Preparation of polyvinylidene fluoride hollow fiber membrane and flat membrane:

[0026] Weigh a certain amount of porogen polyvinylpyrrolidone, improver polyethylene glycol and lithium chloride first dissolve with a small amount of N,N-dimethylacetamide solvent, then add to N,N-dimethylacetamide solvent Stir in;

[0027] Then weigh the polyvinylidene fluoride powder and add it into the mixed liquid, continue to stir, and heat in a water bath at the same time, and the temperature of the water bath is 85°C to 90°C. After each component is fully dissolved, control the temperature of the water bath to 40°C to 50°C, and let the casting solution stand for about 12 hours for defoaming;

[0028] The mass percentages of polyvinylidene fluoride, polyvinylpyrrolidone, polyethylene glycol, lithium chloride, and N, N-...

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Abstract

The present invention is chemical modification technique for grafting radical with hydrophilic and ion exchange performance onto the surface of hollow fiber microfiltering film and plate microfiltering film of polyvinylidene fluoride. By using acrylic acid, PVA, acrylamide, methylene bis-acrylamide, potassium persulfate and other reagents as material and through chemical cross-linking polymerization reaction, carboxyl radical and hydroxyl radical are grafted onto the surface of the microfiltering film. The technique has the advantages of simple operation and high grafting efficiency, and can improve the hydrophilic performance of the microfiltering film and raise the treating capacity of the microfiltering film. The modified microfiltering film can eliminate the suspended matter, colloid matter and water soluble heavy metal ion in water simultaneously, and has raised drinking water purifying effect and expanded application field of microfiltering film of polyvinylidene fluoride.

Description

technical field [0001] The invention relates to the chemical modification technology of the polyvinylidene fluoride microfiltration separation membrane, in particular to the performance improvement of the polymer microfiltration separation membrane. The invention improves the hydrophilic performance of the microfiltration separation membrane, realizes the adsorption and removal of water-soluble heavy metal ions by the microfiltration membrane, improves the water supply purification performance of the microfiltration separation membrane, and promotes the development of sewage treatment and recycling. Inventions belong to the field of technological transformation of polymer materials and the research and development of new materials in the field of environmental science and engineering. Background technique [0002] Microfiltration separation membrane technology has the characteristics of high filtration precision, large water output and good quality. Through the sieving and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34
Inventor 宋来洲王波张尊举王秀丽赵静
Owner YANSHAN UNIV
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