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Preparation method for carbon nanotube super-hydrophobic coating

A technology of super-hydrophobic coating and carbon nanotubes, which is applied in coatings, conductive coatings, etc., can solve the problems of difficult large-scale preparation, cumbersome preparation process, and harsh conditions, so as to avoid agglomeration, simple process, and keep the surface dry Effect

Active Publication Date: 2017-03-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing superhydrophobic surface that can self-elasticate dew droplets during condensation has always had problems such as cumbersome preparation process, harsh conditions, difficulty in large-scale preparation, and high cost.

Method used

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  • Preparation method for carbon nanotube super-hydrophobic coating
  • Preparation method for carbon nanotube super-hydrophobic coating
  • Preparation method for carbon nanotube super-hydrophobic coating

Examples

Experimental program
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Effect test

example 1

[0020] Example 1: Preparation of carbon nanotube superhydrophobic coating by glass substrate substrate spraying method

[0021] Add 80 parts of absolute ethanol, 1 part of ammonia water, 4 parts of deionized water, and 0.8 parts of multi-walled carbon nanotubes into the beaker in a water bath at 35°C. The inner diameter of the nanotubes is 40-50 nm, the length is 10-30 μm, and the hydroxyl content is 5.58%, ultrasonically disperse for 0.5h, add 0.5 parts of tetraethyl orthosilicate dropwise to the solution, react for 1h; finally add 1 part of fluorosilane dropwise into the solution, stir for 24h to obtain a super-hydrophobic coating solution, and The solution was sprayed on the cleaned glass substrate and dried at room temperature to obtain a superhydrophobic coating of carbon nanotubes. The surface morphology was as follows: figure 1 As shown, the static contact angle of a water droplet on it is as figure 2 As shown, the contact angle is 160.3°.

example 2

[0022] Example 2: Preparation of carbon nanotube superhydrophobic coating by spin coating on copper substrate

[0023] Add 130 parts of absolute ethanol, 2.5 parts of ammonia water, 6 parts of deionized water, and 1 part of multi-walled carbon nanotubes into a beaker under the condition of a water bath at 30°C. The inner diameter of the nanotubes is 2-5 nm, the length is 10-30 μm, and the hydroxyl content is 5%, ultrasonically disperse for 1 hour, add 0.8 parts of tetraethyl orthosilicate dropwise to the solution, and react for 1.2 hours; finally, add 1 part of fluorosilane dropwise to the solution, and stir for 36 hours to obtain a superhydrophobic coating solution. The solution was spin-coated on the cleaned copper substrate, and dried at room temperature to obtain a superhydrophobic coating of carbon nanotubes. The surface morphology was as follows: image 3 As shown, condensation condensation self-bounces as Figure 4 As shown, although the carbon nanotubes can be directl...

example 3

[0024] Example 3: Preparation of carbon nanotube superhydrophobic coating by dipping micro-array silicon substrate

[0025] Add 160 parts of absolute ethanol, 4 parts of ammonia water, 7 parts of deionized water, and 1.5 parts of multi-walled carbon nanotubes into the beaker under the condition of a water bath at 45°C. The inner diameter of the nanotubes is 2-5 nm, the length is 1-3 μm, and the hydroxyl content is 8%, ultrasonically disperse for 1 hour, add 1.2 parts of tetraethyl orthosilicate dropwise to the solution, and react for 1.5 hours; finally, add 1.5 parts of fluorosilane dropwise to the solution, and stir for 58 hours to obtain a superhydrophobic coating solution. Dip the cleaned micron silicon column substrate into the solution, take it out and blow dry, repeat 3 to 5 times, and dry at room temperature to obtain a carbon nanotube superhydrophobic coating. The static contact of water droplets on it is as follows: Figure 5 As shown, the contact angle is 159.9°.

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Abstract

The invention relates to a preparation method for a carbon nanotube super-hydrophobic coating. The preparation method comprises the following steps: after pickling a substrate to remove surface oxides, successively ultrasonically cleaning the substrate for 15min with acetone, anhydrous ethanol and deionized water to remove surface oil stains and dust and drying the substrate with cold air for later use; ultrasonically dispersing multiwalled carbon nanotubes containing hydroxyl in an isopropanol solution, and adding ammonia water and deionized water drop by drop; after uniformly stirring the solution, adding tetraethoxysilane; after a reaction for a period of time, dropwise adding a silane solution and continuously stirring the mixture; finally obtaining a carbon nanotube super-hydrophobic coating solution; and spraying the carbon nanotube super-hydrophobic coating solution to the substrate, and drying the substrate to obtain the carbon nanotube super-hydrophobic coating. The super-hydrophobic coating with low adhesive ability has the characteristics of being self-cleaned and resisting pollution, condensation and frosting. The preparation method provided by the invention is simple in preparation process and low in cost, can realize large scale production, and has a wide application prospect and a huge market benefit in the aspects of condensing heat transfer, sea water desalination, air source heat pump and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a preparation method of a carbon nanotube superhydrophobic coating in which dew droplets can bounce by themselves during condensation. Background technique [0002] In daily life and industrial production, a layer of dust and a large number of microorganisms will be deposited on the solid surface, which will not only cause environmental pollution, but also easily endanger human health. The low-adhesion superhydrophobic surface with "lotus leaf effect" has self-cleaning properties , anti-pollution, anti-corrosion and other advantages can effectively solve this problem; in low-temperature and high-humidity environments, condensation and frost / ice are prone to occur on the metal surface, which will not only corrode the metal surface, reduce its service life, and even cause There are major accidents in the use process, and dew removal and defrosting / ice i...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D7/12C09D5/24
Inventor 张友法张静余新泉
Owner SOUTHEAST UNIV
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