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Super-hydrophobic coating for oil-water separation and preparation method thereof

A super-hydrophobic coating, oil-water separation technology, applied in separation methods, filtration separation, liquid separation, etc., can solve the problems of increasing material processing costs, environmental hazards, etc., to promote the promotion of environmental friendliness, easy repair, and reduce waste disposal. cost effect

Active Publication Date: 2018-12-07
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a large number of superhydrophobic oil-water separation materials require complicated steps or adding special sulfur-containing or fluorine-containing compounds to increase the hydrophobicity of the material surface in the preparation process. The use of sulfur or fluorine-containing compounds also poses certain potential hazards to the environment

Method used

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  • Super-hydrophobic coating for oil-water separation and preparation method thereof
  • Super-hydrophobic coating for oil-water separation and preparation method thereof
  • Super-hydrophobic coating for oil-water separation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A superhydrophobic coating for oil-water separation, its preparation process is as follows:

[0026] Weigh 5 grams of hydrogenated castor oil, heat and dissolve it in 95 grams of absolute ethanol to obtain a 5% hydrogenated castor oil ethanol solution, keep the solution temperature at 45 ° C, completely soak the 400-mesh stainless steel filter in the solution, take it out and place it in a clean Dry on a glass plate to obtain a stainless steel filter covered with a superhydrophobic coating. Filter surface topography visible figure 2 , the static contact angle of water droplets on the filter screen surface is 155.5°, and the contact angle of n-hexane on the filter screen surface is ~0°. The 20ml mixture of n-hexane and water can pass through image 3 The device completed the separation within 5 minutes, and the yield of n-hexane after separation was 99.6%. The mixture was separated fifty times, and the static contact angle of water droplets on the surface of the filte...

Embodiment 2

[0028] A superhydrophobic coating for oil-water separation, its preparation process is as follows:

[0029] Weigh 8 grams of hydrogenated castor oil, heat and dissolve it in 92 grams of absolute ethanol to obtain an 8% hydrogenated castor oil ethanol solution, keep the solution temperature at 50 ° C, completely soak the industrial 747 polyester fiber filter cloth in the solution, take it out and place it flat Dry it on a clean glass plate to obtain a filter cloth covered with a superhydrophobic coating. The surface morphology of the filter cloth is visible Figure 4 , the static contact angle of water droplets on the screen surface is 156.5°, and the contact angle of liquid paraffin on the filter cloth surface is ~0°. Each 20ml mixture of liquid paraffin and water can pass through the funnel ( Figure 5 ) separated in 5 minutes, and the yield of liquid paraffin after separation was 99.5%, and the mixture was repeatedly separated thirty times, and the static contact angle of ...

Embodiment 3

[0031] A superhydrophobic coating for oil-water separation, its preparation process is as follows:

[0032] Weigh 4 grams of hydrogenated castor oil, heat and dissolve it in 96 grams of absolute ethanol to obtain a 4% hydrogenated castor oil ethanol solution, keep the solution temperature at 40 ° C, completely soak the 200-mesh nylon filter in the solution, take it out and place it in a clean Dry on a glass plate to obtain a nylon filter covered with a superhydrophobic coating. Filter surface topography visible Image 6 , the static contact angle of water droplets on the surface of the filter is 155.6°, and the contact angle of edible oil on the surface of the nylon filter is ~0°. Separate 20ml mixture of edible oil and water through a funnel covered with a nylon filter. The separation is completed within 5 minutes. Contact angle, the contact angle is reduced to 152.5°, and the coating surface still maintains superhydrophobicity.

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Abstract

The invention discloses a super-hydrophobic coating for oil-water separation and a preparation method thereof, and belongs to the technical field of chemical separation. A hydrogenated castor oil hydrophobic material which is non-toxic and harmless to environments is used for preparing the super-hydrophobic coating. Industrial filter cloth and filter screen fiber surfaces are impregnated in a hydrogenated castor oil ethanol solution by a solution impregnation method to obtain the superhydrophobic coating. The low-energy oil-water separation is realized by utilizing the super-hydrophobicity andsuper-lipophilicity of the coating, and the yield of oily liquid after separation is greater than 99%.

Description

technical field [0001] The invention relates to a superhydrophobic coating for oil-water separation and a preparation method thereof, belonging to the technical field of chemical separation. Background technique [0002] In recent years, with the increase in industrial organic raw material leakage accidents worldwide and the enhancement of people's awareness of environmental protection, the management and treatment requirements for laboratory organic waste liquid, meal waste oil, and oily industrial wastewater have been increasing. Since a large amount of oily liquid waste exists in the state of oil-water mixture, conventional distillation and extraction separation methods are often time-consuming and laborious, and even bring a greater burden to our ecological environment due to huge energy consumption. [0003] Superhydrophobic materials have been widely used in oil-water separation materials due to their super hydrophobicity and lipophilicity. Waste organic liquids, espe...

Claims

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Application Information

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IPC IPC(8): B01D39/08B01D39/12B01D39/16B01D17/022C02F1/40C02F101/30
Inventor 白桦张磊顾丹
Owner JIANGNAN UNIV
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