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Preparation method for superhydrophobic coating with condensation microdroplet self-bouncing properties

A super-hydrophobic coating and characteristic technology, applied in coatings, anti-fouling/underwater coatings, anti-corrosion coatings, etc., to achieve wide application prospects, good application prospects, and reduce the effect of contact area

Active Publication Date: 2017-05-10
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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  • Preparation method for superhydrophobic coating with condensation microdroplet self-bouncing properties
  • Preparation method for superhydrophobic coating with condensation microdroplet self-bouncing properties
  • Preparation method for superhydrophobic coating with condensation microdroplet self-bouncing properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] After 10mL of ammonia solution and 20mL of deionized water were ultrasonically dispersed and mixed for 5 minutes, 2g of acidic chain-type aqueous silica sol (pH=2-4, diameter 9-15nm, chain length 40-100nm, The silicon weight concentration is 10-20%), and a clear mixed solution is obtained after ultrasonic dispersion for 5 minutes. Add the above mixed solution dropwise to 200mL of absolute ethanol solution, ultrasonicate for 5min, then mechanically stir for 5min, then add 1mL tetraethyl orthosilicate solution dropwise, continue mechanically stirring for 60min, then add 0.5mL dropwise The perfluorosilane, and the superhydrophobic coating was obtained after continuous mechanical stirring for 12 hours, and the chain nano-silica after hydrophobic modification still maintained the chain structure, figure 1 Transmission electron micrograph of the coating.

Embodiment 2

[0035]Add 2g of acidic chain-type aqueous silica sol (pH=2-4, diameter 9-15nm, chain length 40-100nm, silica weight concentration 10-20%) to 200mL of absolute ethanol solution, ultrasonic After 10 minutes of mechanical stirring for 10 minutes, the color of the mixed solution began to darken. Add 1 mL of tetraethyl orthosilicate solution dropwise, continue mechanical stirring for 60 minutes, then add 0.5 mL of perfluorosilane dropwise, and finally continue mechanical stirring for 12 hours. Or the reunion is obvious. Add 1 g of alkaline chain-type aqueous silica sol (pH=9-11, diameter 9-15 nm, chain length 40-100 nm, silica weight concentration 30-40%) to 200 mL of absolute ethanol solution After ultrasonication for 10 min, mechanical stirring for 10 min, 1 mL of tetraethyl orthosilicate solution was added dropwise, and after mechanical stirring was continued for 60 min, 0.5 mL of perfluorosilane was added dropwise, and finally mechanical stirring was continued for 12 h to obta...

Embodiment 3

[0037] After 12mL of ammonia solution and 24mL of deionized water were ultrasonically dispersed and mixed for 5 minutes, 3g of chain-type aqueous silica sol (pH=2-4, diameter 9-15nm, chain length 40-100nm, silica weight concentration 10-20%), obtain a clear mixed solution after ultrasonic dispersion for 10 minutes. Add the above mixed solution dropwise to 220mL of isopropanol solution, ultrasonicate for 10min, then mechanically stir for 10min, then add 2mL tetraethyl orthosilicate solution dropwise, continue mechanically stirring for 15min, then add 2mL of Perfluorosilane, after continuous mechanical stirring for 48 hours, a super-hydrophobic coating was obtained, and the coating was dipped and coated on the surface of a clean glass substrate to obtain a nanoporous super-hydrophobic coating. figure 2 Scanning electron micrograph of the coating. Among them, the dip coating process is as follows: soaking time 60s, dipping and pulling speed 100μm / s, residence time 180s, dipping...

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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] A superhydrophobic coating with self-bounce characteristics of condensed droplets and its preparation method Background technique [0002] Superhydrophobicity on solid surfaces (contact angle >150°, rolling angle <10°) is a very common but very special type of superwetting phenomenon, such as superhydrophobic self-cleaning lotus leaves, superhydrophobic high-loaded water strider legs, Super-hydrophobic anti-fog mosquito eyes, etc. Inspired by this, constructing rough structures on the surface of materials by bionic means and modifying them with low surface energy, or directly constructing rough structures on the surface of low surface energy materials, is currently one of the important methods to obtain superhydrophobic surfaces. However, in order for superhydrophobic surface technology to be widely applied in industry, some important technical problems still need to be solved, such as high requirements on the substrate, complex equipment, and i...

Claims

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Application Information

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Patent Type & Authority Applications(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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