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Polyvinylidene fluoride (PVDF) separation film and preparation method thereof

A technology of polyvinylidene fluoride and separation membrane, which is applied in the direction of semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve problems such as high cost and difficult source of raw materials, increase mechanical strength, promote application and development, Solve the effect of small batch

Inactive Publication Date: 2013-10-02
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in the prior art, in the field of inorganic material modified polyvinylidene fluoride separation membrane, there are problems of high cost and difficult source of raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Add 0.05g of highly purified nano-attapulgite produced by Jiangsu Jiuchuan Nano Material Technology Co., Ltd. into 19g of N,N-diformamide organic solvent, stir vigorously and ultrasonically disperse for 30 minutes;

[0043](2) Add 5g of polyvinylidene fluoride and 0.25g of sodium dodecylbenzenesulfonate to the mixture in step (1), stir well, and heat to 48°C in a water bath;

[0044] (3) Add 0.75 g of polyvinylpyrrolidone to the mixed solution obtained in step (2), and heat it in a water bath, keep the temperature of the mixed solution at 48°C, and stir vigorously for 24 hours to form a casting solution with uniform properties;

[0045] (4) Vacuum defoaming the casting solution obtained in step (3) for 30 minutes at -50KPa;

[0046] (5) Put the defoamed casting solution at 25°C and 50% humidity, at a scraping speed of 30mm / s, and the thickness of the scraping film is 250μm;

[0047] (6) After scraping the film, immediately immerse the film in an aqueous coagulation...

Embodiment 2

[0050] (1) Add 0.15g of highly purified nano-attapulgite produced by Jiangsu Jiuchuan Nano Material Technology Co., Ltd. into 14g of N-methylpyrrolidone organic solvent, stir vigorously and ultrasonically disperse for 30 minutes;

[0051] (2) Add 5g of polyvinylidene fluoride and 0.2g of citric acid to the mixture in step (1), stir well, and heat to 53°C in a water bath;

[0052] (3) Add 1.0 g of polyvinylpyrrolidone to the mixed solution obtained in step (2), and heat it in a water bath, keep the temperature of the mixed solution at 53°C, and stir vigorously for 24 hours to form a casting solution with uniform properties;

[0053] (4) Vacuum defoaming the casting solution obtained in step (3) for 30 minutes at -50KPa;

[0054] (5) Put the defoamed casting solution at 25°C and 50% humidity, at a scraping speed of 30mm / s, and the thickness of the scraping film is 250μm;

[0055] (6) After scraping the film, immediately immerse the film in an aqueous coagulation bath containing...

Embodiment 3

[0058] (1) Add 0.25g of highly purified nano attapulgite produced by Jiangsu Jiuchuan Nano Material Technology Co., Ltd. into 21g of N,N dimethylacetamide (DMAC) organic solvent, stir vigorously and ultrasonically disperse for 30 minutes;

[0059] (2) Add 5g of polyvinylidene fluoride and 0.04g of sodium dodecylbenzenesulfonate to the mixture in step (1), stir well, and heat to 50°C in a water bath;

[0060] (3) Add 1.3 g of polyvinylpyrrolidone to the mixed solution obtained in step (2), and heat it in a water bath, keep the temperature of the mixed solution at 50°C, and stir vigorously for 24 hours to form a casting solution with uniform properties;

[0061] (4) Vacuum defoaming the casting solution obtained in step (3) for 30 minutes at -50KPa;

[0062] (5) Put the defoamed casting solution at 25°C and 50% humidity, at a scraping speed of 30mm / s, and the thickness of the scraping film is 250μm;

[0063] (6) After scraping the film, immediately immerse the film in an aqueou...

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PUM

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Abstract

The invention relates to a method for preparing a nano attapulgite modified polyvinylidene fluoride (PVDF) film. The defects that the existing PVDF film is low in hydrophilcity and low in water yield and is easily polluted and the current inorganic nanoparticle modified film is easily aggregated and eroded and is not firm are overcome, and the problems that the modified film is small in batches of artificially synthesized one-dimensional inorganic nanometer material, high in cost and complex in modification process and the like are solved. The preparation method approximately comprises the following steps: uniformly dispersing nano attapulgite, PVDF, a dispersing agent and a pore-foaming agent in an organic solvent, forming a film casting solution, scraping and performing after-treatment on a flat glass plate, so as to obtain the nano attapulgite modified PVDF film.

Description

technical field [0001] The invention relates to the field of film modification, in particular to a modified polyvinylidene fluoride (PVDF) separation membrane and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) is widely used as a raw material for ultrafiltration membranes in industrial production due to its good oxidation resistance, thermal stability, resistance to hydrolysis, good mechanical strength and film-forming properties. However, compared with other membrane materials, the most prominent feature of PVDF is its strong hydrophobicity, which is the main factor restricting the large-scale application of PVDF membranes in many fields, especially the application of protein drugs, food and beverage and water purification, etc. In the separation of the aqueous phase separation system, it is easy to produce adsorption pollution, which reduces the two main separation indicators of membrane flux and rejection rate, reduces the servi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00
Inventor 魏永
Owner CHANGZHOU UNIV