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Preparation method of modified PVDF (polyvinylidene fluoride) membrane

A polyvinylidene fluoride film and a technology of polyvinylidene fluoride are applied in the field of preparation of modified polyvinylidene fluoride film, which can solve the problem of easy pollution of polyvinylidene fluoride film, avoid frequent cleaning of the film, improve hydrophobicity, The effect of improved anti-pollution performance

Inactive Publication Date: 2019-08-02
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to propose a method for preparing a modified polyvinylidene fluoride film, aiming at preparing a modified polyvinylidene fluoride film to solve the problem that the existing polyvinylidene fluoride film is easy to pollute

Method used

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  • Preparation method of modified PVDF (polyvinylidene fluoride) membrane

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preparation example Construction

[0033] In view of this, the present invention proposes a method for preparing a modified polyvinylidene fluoride membrane, through which a modified polyvinylidene fluoride membrane can be prepared, and the modified polyvinylidene fluoride membrane can be used for waste water It has the advantages of good purification effect and strong anti-pollution performance. combine figure 1 The schematic flow chart of an embodiment of the preparation method of the shown modified polyvinylidene fluoride film, the preparation method of the modified polyvinylidene fluoride film comprises the following steps:

[0034] Step S10, stirring the polyvinylidene fluoride and N-methylpyrrolidone evenly to obtain a mixture.

[0035] In this example, N-methylpyrrolidone was added to polyvinylidene fluoride, and the two were mixed uniformly at a certain stirring speed to prepare a mixture. Wherein, the mass ratio of the polyvinylidene fluoride to the N-methylpyrrolidone used is 1:(2-6); the stirring s...

Embodiment 1

[0055] Put 10 g of polyvinylidene fluoride in a reactor, add 20 g of N-methylpyrrolidone, and stir at a stirring speed of 200 r / min to obtain a mixture. Under the condition of stirring at a speed of 200r / min, 0.75g of nano-titanium dioxide with a particle size of 50nm and 3g of polyethylene glycol were added to the mixture, and after being oscillated in an ultrasonic oscillator, vacuum defoaming was carried out at 30°C to obtain Casting solution.

[0056] After coating the casting solution on the flat substrate to form a film, immerse the film-coated flat substrate in an ethanol solution (60% by volume) at 20°C until the film solidifies and falls off, then put the peeled film in the coagulation solution Soak in medium for 16 hours to get the initial film. The initial film was taken out and washed in distilled water for 5 times, then pressed at 0.2 MPa for 2.5 hours to obtain a modified polyvinylidene fluoride film.

Embodiment 2

[0058] Put 5 g of polyvinylidene fluoride in the reactor, add 30 g of N-methylpyrrolidone, and stir at a stirring speed of 300 r / min to obtain a mixture. Under the condition of stirring at a rotating speed of 300r / min, 1.22g of nano-titanium dioxide and 1.75g ​​of polyethylene glycol with a particle size of 30nm were added to the mixture, and after being vibrated in an ultrasonic oscillator, vacuum defoaming was carried out at 50°C to prepare Get the casting solution.

[0059] After coating the casting solution on the flat substrate to form a film, immerse the film-coated flat substrate in an ethanol solution (65% by volume) at 20°C until the film solidifies and falls off, and then put the peeled film in the coagulation solution Soak in medium for 24h to get the initial film. The initial film was taken out and washed 8 times in distilled water, then pressed at 0.26 MPa for 1.5 h to obtain a modified polyvinylidene fluoride film.

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Abstract

The invention discloses a preparation method of a modified PVDF (polyvinylidene fluoride) membrane and relates to the technical field of wastewater treatment. The preparation method of the modified PVDF membrane comprises steps as follows: PVDF and NMP (N-methyl pyrrolidone) are stirred uniformly to obtain a mixture; a nanomaterial and PEG (polyethylene glycol) are added to the mixture under the stirring condition, defoaming treatment is performed, and a membrane casting solution is obtained; the membrane casting solution is applied to a flat plate substrate to form a membrane; the flat platesubstrate covered with the membrane is soaked in a solidification liquid, and a first prepared membrane is obtained; the first prepared membrane is washed and then pressed, and the modified PVDF membrane is obtained. The invention aims to prepare the modified PVDF membrane to solve the problem about high probability of pollution of existing PVDF membranes.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a preparation method of a modified polyvinylidene fluoride membrane. Background technique [0002] With the development of the economy and the improvement of people's living standards, the pollution of oily wastewater is becoming more and more serious, and the output of wastewater is also gradually increasing, which has become a serious environmental and social problem. [0003] Membrane technology is considered to be "the water treatment technology of the 21st century" and plays an important role in energy conservation and emission reduction, green manufacturing, water resource utilization, wastewater treatment, and environmental protection. High molecular organic polymer polyvinylidene fluoride (PVDF) has the advantages of high toughness, good chemical stability, good heat resistance and easy film formation. It is a good membrane material. The membrane made by it h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00C02F1/44C02F101/30
CPCB01D67/0079B01D71/34B01D2325/36C02F1/44C02F2101/30
Inventor 张瑞华周国庆程先忠
Owner WUHAN POLYTECHNIC UNIVERSITY
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