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Preparation method of fluorine containing coating layer possessing ultra hydrophobic and oleophobic surface reinforced by inorganic ultrafine fiber

A technology of ultra-fine fiber and fluorine-containing coating, which is applied in the device, coating, special surface and other directions of coating liquid on the surface, and achieves the effect of low cost and great application prospect.

Inactive Publication Date: 2008-10-15
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual production, more fluorine-containing emulsions are used to prepare coatings, and molybdenum disulfide, various nano-powders, and polymer materials are also filled to improve coating hardness and friction performance, but such fluorine-containing coatings Layers are not superhydrophobic and oleophobic at the same time

Method used

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  • Preparation method of fluorine containing coating layer possessing ultra hydrophobic and oleophobic surface reinforced by inorganic ultrafine fiber
  • Preparation method of fluorine containing coating layer possessing ultra hydrophobic and oleophobic surface reinforced by inorganic ultrafine fiber
  • Preparation method of fluorine containing coating layer possessing ultra hydrophobic and oleophobic surface reinforced by inorganic ultrafine fiber

Examples

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Effect test

Embodiment 1

[0032] Small polytetrafluoroethylene emulsion droplets containing 50wt% potassium titanate whiskers (diameter 0.1-5μm, aspect ratio 1-40) with a solid content of 60wt% are uniformly adhered to the The substrate surface was cured at 80°C, the above steps were repeated several times, and sintered at 350°C for 5 hours to obtain a polytetrafluoroethylene / potassium hexatitanate whisker coating. The coating is composed of particles with a diameter of 0.1-200 μm ( figure 1 ), and there is a nano-scale filamentary secondary structure on a single particle ( figure 2 ). The contact angle between coating and water is 155°( image 3 ), rolling angle 10°; contact angle with glycerin 140°( Figure 4 ); the contact angle with salad oil is 120°( Figure 5 ), coating hardness 4H (GB-T6739-1996).

Embodiment 2

[0038] Small polyvinylidene fluoride emulsion droplets containing 1wt% magnesium salt whiskers (diameter 0.1-2μm, aspect ratio 20-100) with a solid content of 15% are uniformly adhered to the The substrate surface was cured at 100°C, the above steps were repeated several times, and sintered at 380°C for 0.5 hour to obtain a polyvinylidene fluoride / magnesium salt whisker coating with micro / nano secondary structure characteristics. The coating is superhydrophobic and oleophobic. The contact angle of water on the coating surface is 160°, and the rolling angle is 10°; the contact angle of glycerin on the coating surface is 144°; the contact angle of salad oil on the coating surface is 128°. Coating thickness about 50 μm, see image 3 . Coating hardness 3H.

Embodiment 3

[0042] Small polyvinyl fluoride emulsion droplets containing 45wt% titanium oxide whiskers (diameter 0.5-3μm, aspect ratio 20-60) with a solid content of 60wt% are uniformly adhered to the substrate in a single layer or several layers Surface, 90°C. After curing, repeat the above steps several times, and sinter at 370° C. for 1 hour to obtain a polyvinyl fluoride / titanium oxide whisker coating with micro / nano secondary structure characteristics. The coating is superhydrophobic and oleophobic. The contact angle of water on the coating surface is 156°, and the rolling angle is 10°; the contact angle of glycerin on the coating surface is 142°; the contact angle of salad oil on the coating surface is 124°. The hardness of the coating is 4H.

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Abstract

The present invention provides a preparation method of inorganic superfine fibre reinforced fluorocoating layer with superhydrophobic and oleophobic surface and higher hardness. Said method is characterized by that said method includes the following steps: making small drops of fluoroemulsion containing inorganic superfine fibre material be uniformly adhered on the surface of base body in the form of single layer or several layers, diameter of small emulsion drop is 0.1-500 micrometers, solidifying temperature is 80-100deg.C, repeating the above-mentioned step for several times, sintering for 0.1-5hr, at 350-380deg.C so as to obtain the invented fluorocoating layer with micro / nano secondary structure characteristics, and the thickness of said fluorocoating layer is 10-2000 micrometers. The surface of fluorocoating coating layer prepared by said method simultaneously has superhydrophobicity and oleophobicity, the contart angle of it with water is greater than 150deg, rolling angle is less than 10 deg, the contact angle of it with glycerin is greater than 140 deg and contact angle of it with salad oil is greate than 120 deg.

Description

technical field [0001] The invention relates to a method for preparing a superhydrophobic and oleophobic fluorine-containing coating reinforced by inorganic superfine fibers, and belongs to the field of surface engineering. technical background [0002] In recent years, superhydrophobicity (the contact angle between solid surface and water is greater than 150°, and the rolling angle is less than 15°) has attracted attention because of its huge application prospects. However, superhydrophobic surfaces are often not oleophobic, and are easily contaminated by oily substances and lose their superhydrophobic function. Superhydrophobic and oleophobic surfaces are not only superhydrophobic, but also exhibit superior oleophobicity. Therefore, it has a wider application field than superhydrophobic surfaces, and is not only suitable for use in water media, such as applied to the surface of a ship hull, it can prevent fouling, corrosion, and reduce water resistance; applied to buildin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/12C09D127/12B05D5/08B05D3/00
Inventor 陆小华王昌松王浩冯新
Owner NANJING TECH UNIV
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