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A non-uniform superhydrophobic coating with enhanced droplet condensation effect and preparation method thereof

A super-hydrophobic coating and drop-like condensation technology, which is applied in coating, metal material coating process, liquid chemical plating, etc., can solve the problem of difficult processing, high cost of non-uniform wet surface preparation, and difficulty in large-scale Surface preparation and other issues, to achieve the effect of easy operation and realization, good condensation and desorption efficiency, good promotion and application prospects

Active Publication Date: 2019-07-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] Technical problem to be solved: the present invention provides a non-uniform super-hydrophobic coating with enhanced drop-like condensation effect and its preparation method to solve the problems of high preparation cost and difficult processing of non-uniform wetted surfaces existing in the prior art. Inadequacies and defects that make it difficult to achieve large-scale surface preparation

Method used

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  • A non-uniform superhydrophobic coating with enhanced droplet condensation effect and preparation method thereof
  • A non-uniform superhydrophobic coating with enhanced droplet condensation effect and preparation method thereof
  • A non-uniform superhydrophobic coating with enhanced droplet condensation effect and preparation method thereof

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Embodiment 1

[0036] Such as Figure 1-5 As shown, a non-uniform superhydrophobic coating with enhanced droplet condensation effect, the surface of the superhydrophobic coating is made of TiO 2 and SiO 2 Nanoparticles are mixed and self-assembled, and have a nanoporous structure.

[0037] A kind of above-mentioned preparation method of the inhomogeneous superhydrophobic coating that has strengthened dropwise condensation effect, described preparation method comprises the steps:

[0038] (1) First, fill a beaker with 10mL of deionized water, add 1-2 drops of concentrated nitric acid with a concentration of 65wt.% to the beaker through a 2mL standard capacity dropper, and use pH test paper or a pH meter to measure and adjust the beaker. The pH value of the aqueous solution in the solution is 2.0, and the beaker is placed in an ultrasonic cleaner for ultrasonic dispersion, so that the nitric acid is uniformly dispersed and mixed in deionized water;

[0039] (2) Add 0.5 g of silica sol dropw...

Embodiment 2

[0051] A non-uniform superhydrophobic coating with enhanced droplet condensation effect, the surface of the superhydrophobic coating is made of TiO 2 and SiO 2 Nanoparticles are mixed and self-assembled, and have a nanoporous structure.

[0052] A kind of above-mentioned preparation method of the inhomogeneous superhydrophobic coating that has strengthened dropwise condensation effect, described preparation method comprises the steps:

[0053] (1) First, fill a beaker with 10mL of deionized water, add 1-2 drops of concentrated nitric acid with a concentration of 68wt.% to the beaker through a 2mL standard capacity dropper, and use pH test paper or a pH meter to measure and adjust the beaker. The pH value of the aqueous solution in the solution is 2.5, and the beaker is placed in an ultrasonic cleaner for ultrasonic dispersion, so that the nitric acid is uniformly dispersed and mixed in deionized water;

[0054] (2) Add 1.0 g of silica sol dropwise into the beaker of step (1)...

Embodiment 3

[0065] A non-uniform superhydrophobic coating with enhanced droplet condensation effect, the surface of the superhydrophobic coating is made of TiO 2 and SiO 2 Nanoparticles are mixed and self-assembled and stacked, and have a nanoporous structure. The preparation method of the non-uniform superhydrophobic coating includes the following steps:

[0066] (1) First, fill a beaker with 10mL of deionized water, add 1-2 drops of concentrated nitric acid with a concentration of 65wt.% to the beaker through a 2mL standard capacity dropper, and use pH test paper or a pH meter to measure and adjust the beaker. The pH value of the aqueous solution in the solution is 4.0, and the beaker is placed in an ultrasonic cleaner for ultrasonic dispersion, so that the nitric acid is uniformly dispersed and mixed in deionized water;

[0067] (2) Add 1.5 g of silica sol dropwise to the beaker of step (1) using a dropper, and continue ultrasonic dispersion for 10 min;

[0068] (3) Measure 70 mL of ...

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Abstract

Provided are a heterogeneous superhydrophobic coating with an intensified dropwise condensation effect and a preparation method thereof. The preparation method comprises the steps that tetrabutyl titanate and silica sol are scattered in absolute ethyl alcohol separately; then the mixed solution of tetrabutyl titanate and absolute ethyl alcohol is subjected to ultrasonic dispersion and then added into the mixed solution of silica sol and absolute ethyl alcohol; fluoroalkyl silane is added, the solution is stirred for 12-24 h in a water bath of 50-65 DEG C, and a superhydrophobic coating finishing paint solution is prepared; and a substrate is coated with a superhydrophobic coating, fluoroalkyl silane on the TiO2 surface is catalytically decomposed, fluoroalkyl silane on the SiO2 surface cannot be catalytically decomposed, and thus preparation of a hydrophilic-superhydrophobic surface of a sample is achieved. According to the heterogeneous superhydrophobic coating with the intensified dropwise condensation effect and the preparation method thereof, the sample surface dropwise condensation and desorption efficiency is high, the water collecting, antifogging and heat exchange effects are good, and good application prospects and popularization value are achieved.

Description

technical field [0001] The invention belongs to the technical field of surface preparation of super-hydrophobic coatings, and in particular relates to a non-uniform super-hydrophobic coating with enhanced drop-like condensation effect and a preparation method thereof. Background technique [0002] Superhydrophobic material refers to a new type of bionic material with a water drop rolling angle greater than 150° and a contact angle less than 10° on the surface of the material. At present, the preparation technology of superhydrophobic materials with superhydrophobic and self-cleaning properties has been developed rapidly, and has begun to be applied in the fields of industry and life. The surface of a superhydrophobic material that exhibits superhydrophobic properties macroscopically and hydrophilic-hydrophobic heterogeneous wettability microscopically has broad applications in water collection, anti-fog, heat transfer, etc. due to its good condensation and desorption effect ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/12
CPCC23C18/1212C23C18/1216C23C18/1295
Inventor 张友法汪希奎张静余新泉
Owner SOUTHEAST UNIV
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