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Aqueous transparent super-hydrophobic paint and preparation method thereof

A super-hydrophobic coating, water-based technology, applied in coatings and other directions, can solve problems such as unfavorable transportation, environmental pollution, flammable human body, etc., and achieve the effect of reducing cost, good transparency and low VOC

Active Publication Date: 2017-11-17
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And in the preparation process of superhydrophobic coatings, many organic solvents are often used. These organic solvents are volatile, flammable and harmful to human body, and also have great pollution to the environment.
and also not good for transportation
Make the cost of these coatings rise

Method used

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  • Aqueous transparent super-hydrophobic paint and preparation method thereof
  • Aqueous transparent super-hydrophobic paint and preparation method thereof
  • Aqueous transparent super-hydrophobic paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 80mL of deionized water into the reaction kettle equipped with a reflux device, add 4mL of ammonia water, stir evenly, add 1.2g of aqueous silica sol with a pH value of 2-4, and stir at 50-200rpm for 30 minutes. Increase the stirring speed to 500-2000rpm, and adjust the temperature of the water bath to 60°C, add 0.12g each of 2μm and 5μm silica powder, then stir at 50-200rpm for 30 minutes, and finally add 0.6mL tetraethyl orthosilicate, 0.6mL n-octyltriethoxysilane, after stirring for 24 hours, a water-based super-hydrophobic coating with a micro-nano composite structure was obtained (no silicone or silicon-modified resin was added). figure 1 A scanning electron microscope image of the coating.

Embodiment 2

[0027] Add 80mL of deionized water into the reaction kettle equipped with a reflux device, add 4mL of ammonia water, stir evenly, add 1.2g of aqueous silica sol with a pH value of 2-4, and stir at 50-200rpm for 30 minutes. Increase the stirring speed to 500-2000rpm, and adjust the temperature of the water bath to 60°C, add 0.12g each of 0.5μm and 2μm silica powder, then stir at 50-200rpm for 30 minutes, and finally add 0.6mL tetraethyl orthosilicate, 0.6 mL of n-octyltriethoxysilane, stirred for 24 hours to obtain a water-based superhydrophobic coating with a micro-nano composite structure (without adding silicone or silicon-modified resin). figure 2 is the water contact angle image of the coating. Its water contact angle is 154° and its rolling angle is 2°

Embodiment 3

[0029] Add 80mL of deionized water into the reaction kettle equipped with a reflux device, add 4mL of acetic acid, stir evenly, add 1.2g of aqueous silica sol with a pH value of 9-10, and stir at 50-200rpm for 30 minutes. Increase the stirring speed to 500-2000rpm, and adjust the temperature of the water bath to 60°C, add 0.12g each of 0.5μm and 2μm silica powder, then stir at 50-200rpm for 30 minutes, and finally add 0.6mL tetraethyl orthosilicate, 0.6 mL of isobutyltrimethoxysilane, and stirred for 24 hours to obtain a water-based superhydrophobic coating with a micro-nano composite structure (without adding silicone or silicon-modified resin). image 3 Scan the spectroscopic image for the point of the coating. It can be seen from the figure that the coating mainly contains O, Si, and C elements, and does not contain F elements.

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Abstract

The invention provides aqueous transparent super-hydrophobic paint and a preparation method thereof. The preparation method comprises the steps that firstly, deionized water is added into a reaction still, and the pH value is adjusted; secondly, aqueous colloidal silica is added under the conditions of water-bath heating and stirring, then micro composite SiO2 powder is added, tetraethyl orthosilicate, siloxane and aqueous organosilicone or silicone-modified resin are added, and the aqueous super-hydrophobic paint can be obtained after mechanical stirring is conducted for a certain time. In the preparation and use processes of the paint, no fluorine-containing substance is involved, the solvent is water, and the paint is green and environmentally friendly, free of toxins and harmless. The paint is widely used in the aspects of self-cleaning, corrosion prevention, mould prevention, condensation resistance, freezing resistance, oil water separation and the like.

Description

technical field [0001] The invention belongs to the field of hydrophobic coatings, and relates to a water-based transparent super-hydrophobic coating and a preparation method thereof. technical background [0002] Superhydrophobic surfaces (contact angle > 150°, rolling angle less than 10°) have attracted extensive attention from scholars all over the world due to their huge applications in self-cleaning, anti-icing, and anti-corrosion. At present, the preparation of superhydrophobic surfaces is mainly by constructing rough structures on the surface of materials and modifying them with low surface energy substances, or directly constructing rough structures on the surfaces of low surface energy materials. In the process of preparing superhydrophobic surfaces, fluorine-containing substances, such as fluorine-containing silicones and fluorine-containing polymers, are often used. These substances have irreversible damage to the human body and the natural environment. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D7/12
CPCC09D1/00
Inventor 张友法姚道州王山林余新泉
Owner SOUTHEAST UNIV
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