High mechanical durable super-hydrophobic/oil coating with bionic structure and preparation method of high mechanical durable super-hydrophobic/oil coating

A durable and super-hydrophobic technology, used in coatings, devices for coating liquid on surfaces, special surfaces, etc., can solve the problems of wear resistance, difficult application, easy damage, etc. The effect of durability

Active Publication Date: 2019-11-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that the micro-nano-scale rough structure of the current artificial superhydrophobic / oil coating is mostly composed of brittle ceramics or polymers with extremely low hardness. The micro-nano rough structure on the surface is easily damaged when subjected to external mechanical effects such as friction, impact, and bending, and eventually the artificial superhydrophobic / oily surface quickly loses its superhydrophobic / oily properties, making it difficult to obtain in the actual industrial field. application

Method used

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  • High mechanical durable super-hydrophobic/oil coating with bionic structure and preparation method of high mechanical durable super-hydrophobic/oil coating
  • High mechanical durable super-hydrophobic/oil coating with bionic structure and preparation method of high mechanical durable super-hydrophobic/oil coating
  • High mechanical durable super-hydrophobic/oil coating with bionic structure and preparation method of high mechanical durable super-hydrophobic/oil coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Based on aluminum alloy, magnesium alloy, glass and alumina, such as figure 1 The shown electrolytic Cu powder with a particle size of 15-50 microns is used as a raw material, and the preparation method is as follows:

[0037] First, cold spraying was used to prepare metal coatings with coral reef-like flexible micro-rough structures on the surface of different substrates. Before cold spraying, the surface of the substrate was cleaned and dried with acetone. In the process of cold spraying, nitrogen is used as the accelerating gas. The gas pressure is 2.5MPa, the gas temperature is 370°C, the powder feeding rate is 25g / min, and the moving speed of the spray gun is 800mm / s. The cold spray gun scans the surface of the substrate in a zigzag shape. The coating is deposited under the parameter conditions that the distance between spraying lines is 5mm and the spraying distance is 40mm.

[0038] Subsequently, an oxyacetylene flame is used to scan the surface of the cold-spra...

Embodiment 2

[0043] Aluminum alloy, magnesium alloy, glass and alumina are used as substrates, and the morphology is as follows: figure 1 The shown particle size is electrolytic Ni powder of 20-80 microns as raw material, and the preparation method is as follows:

[0044] First, cold spraying is used to prepare a metal coating with a coral reef-like flexible micron-rough structure on the surface of the substrate. Before cold spraying, the substrate surface is cleaned and dried with acetone. In the process of cold spraying, nitrogen is used as the accelerating gas. The gas pressure is 2.0MPa, the gas temperature is 420°C, the powder feeding rate is 40g / min, and the moving speed of the spray gun is 1000mm / s. The cold spray gun scans the surface of the substrate in a zigzag shape. The coating is deposited under the parameter conditions that the distance between spraying lines is 5mm and the spraying distance is 40mm.

[0045] After the spraying is completed, directly use a 0.5% stearic acid ...

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Abstract

The invention discloses a high mechanical durable super-hydrophobic/oil coating with a bionic structure and a preparation method of the high mechanical durable super-hydrophobic/oil coating. The highmechanical durable super-hydrophobic/oil coating comprises the following steps of step one, spraying metal powder with a micro or nano fine structure on the surface of a cleaned member by adopting a cold spraying method, and obtaining a metal coating with a coral reef-like flexible bionic structure on the surface of the member; step two, spraying a solution containing low surface energy chemical substances on the surface of the metal coating which is treated in the step one and has the coral reef-like flexible bionic structure by adopting a conventional spraying method; and after a solvent evaporates, forming the high mechanical durable super-hydrophobic/oil coating with the bionic structure on the surface of the metal coating with the coral reef-like flexible bionic structure. By use of the method, mechanical durability of the super-hydrophobic/oil coating can be effectively improved, so that the contact angle of the prepared high mechanical durable super-hydrophobic/oil coating withthe bionic structure still can be kept to be greater than 150 degrees under the action of an external mechanical force, and a rolling angle is kept to be smaller than 3 degrees.

Description

technical field [0001] The invention belongs to the technical field of material engineering, and relates to a superhydrophobic / oily coating and a preparation method thereof, in particular to a highly mechanically durable superhydrophobic / oily coating with a bionic structure and a preparation method thereof. Background technique [0002] Superhydrophobic / oily surface technology is a surface with special wetting properties for liquids such as water and oil based on the bionic principles of natural surfaces such as lotus leaf surfaces, water fly legs, and shark skin. The droplets do not wet and the droplets can roll freely on the surface. The larger the static contact angle between the droplet and the surface, the easier it is for the droplet to roll off the surface, and the stronger the hydrophobic / oily properties of the surface. In general, a surface with a static water droplet / oil droplet (CA) greater than 150° and a rolling angle less than 10° is called a superhydrophobic / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/08
CPCB05D5/083
Inventor 雒晓涛李长久
Owner XI AN JIAOTONG UNIV
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