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A method for preparing a superhydrophobic coating with self-bounce properties of condensed droplets

A super-hydrophobic coating and characteristic technology, applied in coatings, anti-fouling/underwater coatings, anti-corrosion coatings, etc., to achieve broad application prospects, improve anti-condensation effect, and low price

Active Publication Date: 2019-09-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reported inorganic nano-superhydrophobic coatings are rarely used in low-temperature condensation heat transfer equipment.

Method used

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  • A method for preparing a superhydrophobic coating with self-bounce properties of condensed droplets
  • A method for preparing a superhydrophobic coating with self-bounce properties of condensed droplets
  • A method for preparing a superhydrophobic coating with self-bounce properties of condensed droplets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] After mixing 10 mL of aqueous ammonia solution and 20 mL of deionized aqueous solution through ultrasonic dispersion for 5 minutes, add 2 g of acidic chain aqueous silica sol (pH=2-4, diameter 9-15nm, chain length 40-100nm, dioxide The weight concentration of silicon is 10-20%), and a clear mixed solution is obtained after 5 minutes of ultrasonic dispersion. Add the above mixed solution dropwise to 200mL of absolute ethanol solution, sonicate for 5 minutes and then mechanically stir for 5 minutes, then add 1mL of tetraethylorthosilicate solution dropwise, continue mechanical stirring for 60 minutes, and then add 0.5mL dropwise The superhydrophobic coating is obtained after 12 hours of continuous mechanical stirring, and the chain nano-silica after hydrophobic modification still maintains the chain structure. figure 1 It is a transmission electron micrograph of the coating.

Embodiment 2

[0035] Add 2g of acidic chain aqueous silica sol (pH=2-4, diameter 9-15nm, chain length 40-100nm, silica weight concentration 10-20%) dropwise into 200mL of absolute ethanol solution, ultrasonic After 10 minutes of mechanical stirring for 10 minutes, the mixed solution began to appear darker in color. Then 1mL of tetraethylorthosilicate solution was added dropwise, and after mechanical stirring for 60 minutes, 0.5mL of perfluorosilane was added dropwise, and finally mechanical stirring was continued for 12 hours. The obtained superhydrophobic coating appeared white suspension emulsion, gel Or the reunion is obvious. And add 1g of alkaline chain type aqueous silica sol (pH=9-11, diameter 9-15nm, chain length 40-100nm, silica weight concentration 30-40%) dropwise to 200mL of absolute ethanol solution After sonicating for 10 minutes, mechanically stirring for 10 minutes, and then adding 1 mL of tetraethyl orthosilicate solution dropwise, after continuing mechanical stirring for 6...

Embodiment 3

[0037] After mixing 12 mL of aqueous ammonia solution and 24 mL of deionized aqueous solution through ultrasonic dispersion for 5 minutes, add 3 g of chain aqueous silica sol (pH=2-4, diameter 9-15nm, chain length 40-100nm, silica The weight concentration is 10-20%), and a clear mixed solution is obtained after ultrasonic dispersion for 10 minutes. Add the above mixed solution dropwise to 220mL of isopropanol solution, sonicate for 10 minutes and then mechanically stir for 10 minutes, then add 2mL of tetraethylorthosilicate solution dropwise, continue mechanical stirring for 15 minutes, and then add 2mL of Perfluorosilane, the superhydrophobic coating is obtained after 48 hours of continuous mechanical stirring. The coating is immersed and coated on the surface of the clean glass substrate to obtain a nanoporous superhydrophobic coating. figure 2 The scanning electron micrograph of the coating. Among them, the dipping coating process is: dipping time 60s, dipping pulling speed...

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Abstract

The invention relates to a preparation method for a superhydrophobic coating with condensation microdroplet self-bouncing properties. The preparation method comprises the following steps: with a waterborne chain type silica sol as a raw material, carrying out dilution and dispersion with an alkaline aqueous solution so as to effectively prevent the waterborne silica sol from agglomeration, then carrying out dispersing in a volatile organic solution, adding tetraethyl orthosilicate, fluoroalkyl silane and the like into the obtained dispersion liquid, then subjecting silica sol particles to surface modification, and carrying out continuous mechanical stirring so as to obtain the superhydrophobic coating. The coating can be applied to a variety of soft and hard substrates through manners of spraying, dipping, pulling, rolling or brushing, thereby obtaining the superhydrophobic surface with a porous nanometer structure, wherein the porous nanometer structure also enables condensation microdroplets to obtain self-bouncing properties. The coating has extensive application in the aspects of surface self-cleaning and corrosion and mildew prevention, especially in the aspects of condensation heat transfer, water collection, frost prevention, ice resisting, etc. The preparation method provided by the invention has the characteristics of simple preparation process and equipment, easiness in operation, low cost, etc., and is applicable to large-scale preparation and industrial production.

Description

Technical field [0001] Super-hydrophobic coating with self-bounce characteristics of condensed droplets and preparation method thereof Background technique [0002] Superhydrophobicity of solid surface (contact angle> 150°, roll angle <10°) is a very common but very special type of super-wetting phenomenon, such as super-hydrophobic self-cleaning lotus leaf, super-hydrophobic high-load water strider legs, super-hydrophobic anti-fogging mosquito eyes, etc. Inspired by this, building a rough structure on the surface of a material by biomimetic means and modifying it with low surface energy, or directly building a rough structure on the surface of a low surface energy material, is currently one of the important methods to obtain a superhydrophobic surface. However, for the superhydrophobic surface technology to be widely used in industrial applications, some important technical problems need to be solved, such as high requirements for substrates, complex equipment, and immatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00C09D5/08C09D5/14
Inventor 张友法王山林张文文余新泉
Owner SOUTHEAST UNIV
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