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Super-hydrophilic particle hybridized super-hydrophobic coating and preparation method thereof

A super-hydrophobic coating and super-hydrophilic technology, applied in the direction of coating, etc., can solve the problems of complex preparation process and method, unsuitable for large-area application, and limited single substrate, so as to increase the adhesion of droplets and promote the collection Water efficiency, easy desorption effect

Inactive Publication Date: 2016-10-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing non-uniform wettability surface preparation technology and method pursues patterning, the preparation process and method are complicated, the substrate is limited and single, the cost is high, and it is not suitable for large-area application. Therefore, it is imminent to prepare a non-uniform wettability surface that can be applied on a large area

Method used

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  • Super-hydrophilic particle hybridized super-hydrophobic coating and preparation method thereof
  • Super-hydrophilic particle hybridized super-hydrophobic coating and preparation method thereof
  • Super-hydrophilic particle hybridized super-hydrophobic coating and preparation method thereof

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preparation example Construction

[0034] A method for preparing a superhydrophobic coating hybridized with superhydrophilic particles, the steps are:

[0035] (1) Pre-treatment: The metal substrate is polished with 800#, 1000#, 1500# sandpaper in sequence, mechanically polished, and then ultrasonically cleaned with acetone, absolute ethanol and deionized water for 15 minutes, and dried with cold air for later use. The substrate can be a copper sheet , nickel sheet, aluminum sheet, stainless steel sheet and other metal substrates, or inorganic materials such as glass and ceramics, or polymer materials such as polypropylene, polyethylene, polyurethane, etc. The shape can be flat surface, curved surface or special shape surface;

[0036] (2) Preparation of superhydrophobic coating solution:

[0037]Under the condition of water bath at 20-40°C, add 50-100 parts of absolute ethanol, 1-5 parts of ammonia water, and 5-10 parts of deionized water into the reaction kettle, stir at a speed of 1500r / min, and add 0.5- 5...

Embodiment 1

[0040] Example 1 Preparation of Nano-SiO by Copper Substrate Substrate Spraying Method 2 superhydrophobic coating

[0041] Under the condition of water bath at 20°C, add 50 parts of absolute ethanol, 1 part of ammonia water, and 5 parts of deionized water into the reaction kettle, stir at a speed of 1500r / min, and add 0.5 parts of chain-type nano-SiO2 dropwise. 2 Sol, after stirring for 30 minutes; add 0.5 parts of tetraethyl orthosilicate dropwise into the solution, and react for 10 minutes; finally, add 2 parts of fluorosilane dropwise into the solution, stir for 24 hours to obtain a superhydrophobic coating solution, and spray the solution On the cleaned copper substrate, drying can obtain nano-SiO 2 Superhydrophobic coating, surface morphology such as figure 1 As shown, nano-SiO 2 The superhydrophobic coating is evenly covered on the substrate, and the chains are intertwined with each other to form a nano-cavity structure. Nano-SiO 2 The particle size of the particles ...

Embodiment 2

[0042] Example 2 Glass substrate brushing method to prepare hybrid superhydrophobic coating with glass beads

[0043] Under the condition of 30°C water bath, add 80 parts of absolute ethanol, 5 parts of ammonia water, and 7 parts of deionized water into the reaction kettle, stir at a speed of 1500r / min, and add 3 parts of chain nano-SiO2 dropwise. 2 sol, after stirring for 30 minutes; add 1 part of tetraethyl orthosilicate dropwise into the solution, and react for 30 minutes; Add microbeads (10 μm) superhydrophilic particles into the prepared superhydrophobic coating solution, continue to stir for more than 1 hour until the mixed solution is evenly dispersed, brush on the cleaned glass substrate, and obtain glass microbeads after drying Particle-hybrid superhydrophobic coatings, on which the static contact of water droplets is as image 3 As shown, the contact angle is 159.2°.

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Abstract

The invention relates to a super-hydrophilic particle hybridized super-hydrophobic coating and a preparation method thereof. A substrate is ultrasonically cleaned through acetone, absolute ethyl alcohol and deionized water in sequence for 15 min, and oil stain and dust on the surface are removed; then, absolute ethyl alcohol is used for elution, and cold-blast air is used for drying for use. Nanometer SiO2 sol is subjected to fluoroalkyl silane modification, a super-hydrophobic coating spraying solution is obtained, a super-hydrophilic monodisperse sphere type nanometer SiO2 solution, silica powder and glass beads are added into the super-hydrophobic coating spraying solution, stirred to be uniform and sprayed on the substrate, and after solidification, the super-hydrophilic particle hybridized super-hydrophobic coating is obtained. The coating has the low adhesion and super-hydrophobicity, and the condensation and dewfall efficiency and the dewdrop adsorption amount are remarkably high compared with a super-hydrophobic coating. The preparation technology is simple, no pollution is caused, operation is easy, the apparent mass is good, the cost is low, and wide application prospect and huge market benefits are achieved on the aspects of heat exchangers, water collection, seawater desalination and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a superhydrophobic coating with superhydrophilic particle hybridization and its preparation technology Background technique [0002] Condensation and frost formation on solid surfaces are very common in low temperature and high humidity environments. They not only accelerate the corrosion of the solid surface and reduce the service life of the equipment, but also reduce the temperature difference between the solid-air interface due to the water film generated during the condensation process, resulting in increased thermal resistance, increased energy consumption, and reduced condensation heat transfer efficiency, which greatly causes Energy waste. According to research at home and abroad, in the condensation process, dew condensation and frost formation are very complicated processes, involving droplet nucleation and growth, interface, thermal, droplet transport...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D7/12
CPCC09D1/00C09D7/61C09D7/70
Inventor 张友法张静王山林曾佳余新泉
Owner SOUTHEAST UNIV
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