Production formula and method of PVDF (polyvinylidene fluoride)/carbon nano-tube super-hydrophobic film

A carbon nanotube and super-hydrophobic technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of small pore size and inability to meet high permeation flux, and achieve large aspect ratio and enhanced Effect of mechanical properties and thermal stability, good permeability

Inactive Publication Date: 2015-08-12
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface of the membrane produced by this method is dense and the pore size is small, which cannot meet the requirements of high permeation flux.

Method used

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  • Production formula and method of PVDF (polyvinylidene fluoride)/carbon nano-tube super-hydrophobic film
  • Production formula and method of PVDF (polyvinylidene fluoride)/carbon nano-tube super-hydrophobic film
  • Production formula and method of PVDF (polyvinylidene fluoride)/carbon nano-tube super-hydrophobic film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 1 g of carboxylated carbon nanotubes (0.4-8 nm in diameter) and add them into 159 ml of N,N-dimethylformamide, and disperse them evenly by ultrasonication for 1 h. Afterwards, 40g of PVDF was added to the above solution while stirring, stirred for 4 hours under the condition of heating in a water bath at 80°C to dissolve completely, and a uniformly mixed casting solution was obtained after defoaming in a vacuum oven at 80°C. Use a scraper to scrape the casting liquid on a polyethylene plate to prepare a nascent flat film, and then place the nascent flat film in a closed environment at 40°C and a relative humidity of water vapor of 80% until it solidifies into a PVDF film; place the PVDF film on the Soak in deionized water for 24 hours to completely remove the residual solvent in the PVDF membrane to obtain the PVDF / carbon nanotube super-hydrophobic membrane.

[0031] The PVDF / carbon nanotube superhydrophobic membrane that this embodiment makes is carried out perfo...

Embodiment 2

[0038] Weigh 1 g of carboxylated carbon nanotubes (0.4-8 nm in diameter) and add them into 159 ml of N,N-dimethylformamide, and disperse them evenly by ultrasonication for 1 h. Afterwards, 40g of PVDF was added to the above solution while stirring, stirred for 4 hours under the condition of heating in a water bath at 80°C to dissolve completely, and a uniformly mixed casting solution was obtained after defoaming in a vacuum oven at 80°C. Use a scraper to scrape the casting solution on a polyethylene plate to prepare a nascent flat film, and then place the nascent flat film in a closed environment at 40 ° C and a relative humidity of water vapor of 99% until it solidifies into a PVDF film; place the PVDF film on the Soak in deionized water for 24 hours to completely remove the residual solvent in the PVDF membrane to obtain the PVDF / carbon nanotube super-hydrophobic membrane.

[0039] The PVDF / carbon nanotube superhydrophobic membrane that this embodiment makes is carried out p...

Embodiment 3

[0041] Weigh 1 g of carboxylated carbon nanotubes (0.4-8 nm in diameter) and add them into 159 ml of N,N-dimethylformamide, and disperse them evenly by ultrasonication for 1 h. Afterwards, 40g of PVDF was added to the above solution while stirring, stirred for 4 hours under the condition of heating in a water bath at 80°C to dissolve completely, and a uniformly mixed casting solution was obtained after defoaming in a vacuum oven at 80°C. Use a scraper to scrape the casting solution on a polyethylene plate to prepare a nascent flat film, and then place the nascent flat film in a closed environment at 60°C and a relative humidity of water vapor of 80% until it solidifies into a PVDF film; place the PVDF film on the Soak in deionized water for 24 hours to completely remove the residual solvent in the PVDF membrane to obtain the PVDF / carbon nanotube super-hydrophobic membrane.

[0042]The PVDF / carbon nanotube superhydrophobic membrane that this embodiment makes is carried out perf...

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Abstract

The invention discloses a production formula and method of a PVDF (polyvinylidene fluoride)/carbon nano-tube super-hydrophobic membrane. The formula includes, by weight, 5% to 30% of PVDF, 0.005% to 5% of carbon nano-tubes, and 67% to 91% of solvent. The production method includes: evenly dispersing the carbon nano-tubes in the solvent, adding the PVDF, and performing high-speed stirring at 50 DEG C to 100 DEG C to obtain casting solution; producing a flat membrane by scraping, or producing hollow fibers to obtain a primary membrane via a hollow spinneret; solidifying the primary membrane in the non-polar steam environment, and removing solvent residue by deionizing soaking so as to obtain the PVDF/carbon nano-tube super-hydrophobic membrane. The membrane produced by the formula and the method is rich in CNTs on surface and has super-hydrophobic surface and excellent permeability; the method is simple, and operability is high.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a membrane-making formula and a preparation method of a PVDF / carbon nanotube superhydrophobic membrane. Background technique [0002] PVDF is a fluorine-containing polymer material, which has good rigidity, hardness, creep resistance, wear resistance, stretchability and impact resistance; in addition, its chemical stability, acid and alkali resistance, oxidants, salts Corrosive to solvents, thermal stability, UV resistance and weather resistance; also has high hydrophobicity, is a very widely used film-making material. At present, polyvinylidene fluoride (PVDF) membranes have been widely used in wastewater treatment, drinking water purification, oil-water separation, industrial gas filtration, and membrane distillation, but the hydrophobic properties of PVDF membranes still cannot meet its application in superhydrophobic aspects. . [0003] At present, there have been some st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D67/00
Inventor 李娜娜赵秀朕肖长发刘晓伟谢胜坤
Owner TIANJIN POLYTECHNIC UNIV
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