Superhydrophobic modified electrostatically-spun membrane and preparation method and application thereof

A superhydrophobic modification and electrospinning technology, which is applied in textiles, papermaking, non-woven fabrics, etc., can solve the problems affecting the porosity of the membrane, improve the membrane flux, prevent membrane wetting, and the preparation process is simple and easy Effect

Active Publication Date: 2017-06-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the surface of the membrane, the membrane contains a large number of nodes, and the existence of nodes seriously affects the porosity of the membrane.

Method used

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  • Superhydrophobic modified electrostatically-spun membrane and preparation method and application thereof
  • Superhydrophobic modified electrostatically-spun membrane and preparation method and application thereof
  • Superhydrophobic modified electrostatically-spun membrane and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In this example, a polyvinylidene fluoride electrospun membrane covered with a carbon nanotube network for membrane distillation with a pore size of 0.20 μm was prepared. The specific preparation method includes the following steps:

[0040] (1) Dissolve 5 parts of polyvinylidene fluoride (molecular weight 1.10 to 1.2 million) and 0.004 part of lithium chloride in 76 parts of N,N-dimethylformamide and 19 parts of acetone mixed solvent, and keep the temperature in a water bath at 50°C Stirring and reflux for 4 hours to obtain a uniform and stable polyvinylidene fluoride polymer spinning solution, which was allowed to stand overnight to remove air bubbles;

[0041] (2) Electrospinning the polyvinylidene fluoride polymer spinning solution for 16 hours to prepare a polyvinylidene fluoride electrospinning membrane. In the electrospinning process, the needle of the syringe is a flat needle, and the needle is connected to the positive electrode of the high-voltage power supply...

Embodiment 2

[0048] In this example, a vinylidene fluoride hexafluoropropylene copolymer electrospun membrane covered with a carbon nanotube network with a pore size of 0.29 μm was prepared. The specific preparation method includes the following steps:

[0049] (1) Dissolve 13 parts of vinylidene fluoride hexafluoropropylene copolymer (molecular weight: 455,000) and 0.004 part of sodium chloride in 85 parts of dimethylacetamide solvent, and stir at a constant temperature in a water bath at 55°C for 4 hours to obtain a uniform Stable vinylidene fluoride hexafluoropropylene copolymer spinning solution, the solution was allowed to stand overnight to remove air bubbles;

[0050] (2) Electrospinning the vinylidene fluoride hexafluoropropylene copolymer spinning solution for 13 hours to prepare a vinylidene fluoride hexafluoropropylene copolymer electrospinning membrane. Wherein the needle of the syringe is a flat needle, the needle is connected to the positive pole of the high-voltage power sup...

Embodiment 2

[0054] The electrospun membrane covered with carbon nanotube network for membrane distillation prepared in Example 2 is tested for water contact angle, and its water contact angle is 161.0°, and its minimum osmotic pressure test is 178kPa;

[0055] The surface structure of the electrospun membrane covered with a carbon nanotube network for membrane distillation prepared in Example 2 was observed, and the carbon nanotubes on the surface of the electrospun membrane covered with a carbon nanotube network for membrane distillation were found to be uniform under a scanning electron microscope. The surface morphology of the membrane after the membrane distillation test was analyzed, and it was found that the morphology of the carbon nanotubes on the surface did not change, indicating that the carbon nanotubes were firmly combined with the polyvinylidene fluoride electrospun membrane.

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PUM

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Abstract

The invention discloses a preparation method of a superhydrophobic modified electrostatically-spun membrane, comprising the steps of mixing a hydrophobic polymer, electrolyte and solvent A into a polymer spinning dope, and performing electrostatic spinning to obtain an electrostatically-spun membrane; dispersing carbon nanotubes in solvent B to obtain carbon nanotube dispersion, coating the electrostatically-spun membrane with the dispersion, and drying to obtain a precursor; hot-pressing at last to obtain the superhydrophobic modified electrostatically-spun membrane. The preparation method disclosed herein prevents mass nodes due to carbon nanotubes being doped directly in an electrostatic spinning dope, the method is simple and convenient, and the prepared modified electrostatically-spun membrane has good hydrophobicity, high porosity and flux as well as high retention rate, and meets the requirement for membrane application in membrane distillation process.

Description

technical field [0001] The invention relates to the field of membrane distillation separation, in particular to a superhydrophobic modified electrostatic spinning membrane and its preparation method and application. Background technique [0002] The shortage of water resources is still an important problem facing our country, especially with the impact of climate change in recent years and the extreme weather problems caused by the El Niño phenomenon, the uneven distribution of water resources has increasingly become a factor restricting local economic development. Seawater desalination, as a means of increasing water resources, is increasingly becoming a means of solving shortages. Seawater desalination is actually a way of exchanging energy for resources. At the same time, with the country’s goal of reducing energy consumption per unit of GDP by more than 3.4% this year, energy conservation and emission reduction have also become one of the goals in the field of seawater d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D06N3/00
Inventor 张林阎康康侯立安
Owner ZHEJIANG UNIV
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