Nanopowder hydrophobicity and lipophobicity modification method

A nano-powder, hydrophobic and oleophobic technology, applied in the direction of coating, etc., can solve the problem of complex solution configuration, and achieve the effect of simple operation steps, stable performance and high repeatability

Inactive Publication Date: 2017-06-27
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Examples

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Embodiment 1

[0028] (1) Mix silica nano-powder with a particle size of 10nm-100nm and cyclohexane, and treat it with an ultrasonic disperser for 10 minutes to obtain a uniformly dispersed suspension.

[0029] (2) Add perfluorooctyltrimethoxysilane dropwise to the suspension obtained in step (1) for impregnation treatment, and stir at 500 rpm for 12 hours. Wherein the mass percentage of each substance is: the amount of nano silicon dioxide is 1.0%, the amount of cyclohexane is 98.0%, and the mass fraction of perfluorooctyltrimethoxysilane is 1%.

[0030] (3) The impregnated suspension is spray-dried, the air inlet temperature of the spray-drying is controlled at 120-150°C, and the outlet temperature is at 60-80°C. Fluorinated silica is obtained.

[0031] Modification results: The contact angle was measured by DropMeterA-100P contact angle measuring instrument. The water contact angle of fluorinated silica is about 150°, and the oil contact angle is about 162°.

Embodiment 2

[0033] (1) Mix silica nanopowder with a particle size of 10nm-100nm and cyclohexane, and treat it with an ultrasonic disperser for 30 minutes to obtain a uniformly dispersed suspension.

[0034] (2) Add perfluorooctyltrimethoxysilane dropwise to the suspension obtained in step (1) for impregnation treatment, and stir at 600 rpm for 24 hours. Wherein the mass percentage of each substance is: the amount of nano silicon dioxide is 2.0%, the amount of cyclohexane is 96.0%, and the mass fraction of perfluorooctyltrimethoxysilane is 2%.

[0035] (3) The impregnated suspension is spray-dried, the air inlet temperature of the spray-drying is controlled at 120-150°C, and the outlet temperature is at 60-80°C. Fluorinated silica is obtained.

[0036] Modification results: The contact angle was measured by DropMeterA-100P contact angle measuring instrument. The water contact angle of fluorinated silica is about 152°, and the oil contact angle is about 165°.

Embodiment 3

[0038] (1) Mix titanium dioxide nanopowder with a particle size of 10nm-100nm and cyclohexane, and treat it with an ultrasonic disperser for 10 minutes to obtain a uniformly dispersed suspension.

[0039] (2) Add perfluorooctyltrimethoxysilane dropwise to the suspension obtained in step (1) for impregnation treatment, and stir at 1000 rpm for 12 hours. Wherein the mass percentage of each substance is: the amount of nano-titanium dioxide is 1.0%, the amount of cyclohexane is 98.0%, and the mass fraction of perfluorooctyltrimethoxysilane is 1%.

[0040] (3) The impregnated suspension is spray-dried, the air inlet temperature of the spray-drying is controlled at 120-150°C, and the outlet temperature is at 60-80°C. Fluorinated silica is obtained.

[0041] Modification results: The contact angle was measured by DropMeterA-100P contact angle measuring instrument. The water contact angle of fluorinated silicon dioxide was about 152°, and the oil contact angle was about 153°.

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Abstract

The invention relates to a nanopowder hydrophobicity and lipophobicity modification method. The nanopowder hydrophobicity and lipophobicity modification method includes firstly, mixing nanopowder with an organic solvent, and treating a mixture by an ultrasonic dispersion meter to obtain a uniform dispersed suspension; then, dropwise adding a fluorinating agent into the suspension for immersion treatment; finally, conducting spray drying to obtain modified fluorinated nanopowder. The modified nanopowder has excellent hydrophobicity and lipophobicity. The nanopowder hydrophobicity and lipophobicity modification method is simple to implement and easy for mass production.

Description

technical field [0001] A method for hydrophobic and oleophobic modification of nanometer powder, the invention belongs to the field of new self-cleaning materials, and in particular relates to the hydrophobic and oleophobic modification of nano silicon dioxide or titanium dioxide powder. Background technique [0002] In recent years, the phenomenon of superhydrophobicity on the surface of plant leaves has attracted people's attention. The so-called superhydrophobic ability of plants means that the leaves of plants have significant hydrophobicity, desorption, anti-sticking, self-cleaning functions, etc. With the development of science, the design and application of various hydrophobic surfaces has become one of the hot research issues. It is generally considered that a surface with a water droplet contact angle greater than 150° is called a superhydrophobic surface. There are many animal and plant surfaces in nature with high hydrophobicity and self-cleaning functions. For ...

Claims

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Application Information

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IPC IPC(8): C09D7/12
CPCC08K3/22C08K3/36C08K9/04C08K9/06C08K2003/2241C08K2201/011C09D7/62
Inventor 徐冲仲兆祥邢卫红江倩乔浩
Owner NANJING UNIV OF TECH
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