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High-robustness lotus-leaf-imitating structure super-hydrophobic coating as well as preparation method and application thereof

A super-hydrophobic coating and high-robust technology, applied in the field of super-hydrophobic coating with high-robust imitation lotus leaf structure and its preparation, can solve the problems of insufficient air layer stability and insufficient super-hydrophobic microstructure, etc. To achieve the effect of efficient and fast process, simple and easy preparation method, and high robustness

Active Publication Date: 2022-05-27
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a highly robust imitation lotus leaf structure superhydrophobic coating and its preparation method and application, which are used to overcome the shortcomings of the prior art that the superhydrophobic microstructure is not fine enough and the stability of the air layer is insufficient.

Method used

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  • High-robustness lotus-leaf-imitating structure super-hydrophobic coating as well as preparation method and application thereof
  • High-robustness lotus-leaf-imitating structure super-hydrophobic coating as well as preparation method and application thereof
  • High-robustness lotus-leaf-imitating structure super-hydrophobic coating as well as preparation method and application thereof

Examples

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Effect test

preparation example Construction

[0035] The present invention provides a preparation method of a high robustness imitation lotus leaf structure super-hydrophobic coating, comprising the following steps:

[0036] S1: Disperse the nanoparticles in a fluorosilane solution, adjust the pH to 4-6 with an acidic aqueous solution to hydrolyze the fluorosilane, and heat and stir to fully react the fluorosilane and the nanoparticles to obtain hydrophobic nanoparticles.

[0037] Step S1 is to hydrophobically modify the nanoparticles.

[0038] Preferably, the particle size of the nanoparticles is 4-500 nm, so as to facilitate the construction of a micro-nano hierarchical structure. If the particles are too small, the cost is too high, the particles are too large, and it is difficult to disperse into small droplets with a size smaller than that of air spray droplets, and the ideal structure cannot be obtained.

[0039] Preferably, the nanoparticles are at least one of aluminum oxide, iron tetroxide, zinc oxide, ceria, ti...

Embodiment 1

[0056] The present embodiment provides a method for preparing a highly robust imitation lotus leaf structure super-hydrophobic coating, comprising the following steps:

[0057] S1: Hydrophobic epoxy resin is obtained by hydrophobically modifying E-51 epoxy resin by the method described in patent CN 109836557 A.

[0058] Disperse 1 g of silica nanoparticles in an ethanol solution of fluorosilane, add 50% acetic acid aqueous solution to adjust the pH to 4-6, and stir at 60° C. for 2 hours to obtain hydrophobic silica particles.

[0059] S2: Disperse 2 g of hydrophobic epoxy resin, 0.68 g of D230 curing agent, and 1 g of hydrophobic silica particles in 50 g of ethyl acetate solution, and fully stir with a magnetic stirrer for 10 min to uniformly mix the components to obtain a mixed solution.

[0060] S3: Put the above mixed solution in a 10mL syringe, use a 22G needle through an electrospinning device, set the advancing speed to 0.2mm / h, and adjust the voltage to 18kV so that the...

Embodiment 2～7

[0066] The preparation process of the present invention mainly lies in the regulation of the size of the spray droplets and the evaporation rate of the organic solvent.

[0067] This embodiment provides a preparation method of a highly robust imitation lotus leaf structure superhydrophobic coating. The process parameters and the contact angle of the prepared samples are shown in Table 1, and other preparation processes are the same as those in Embodiment 1.

[0068] The process parameters have a significant effect on the droplet state and deposition process, among which the voltage, humidity and the concentration of hydrophobic particles have a significant effect on the deposition effect. From the comparison of Examples 1 to 7, it can be seen that the voltage must reach a certain intensity in order to achieve a good atomization effect. From Examples 1 to 3, it can be seen that the lower the voltage, the worse the atomization effect, and the larger the atomized droplets, result...

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Abstract

The invention discloses a high-robustness lotus-leaf-imitating structure super-hydrophobic coating and a preparation method and application thereof.According to the method, the super-hydrophobic coating is prepared through high-voltage electrostatic spraying of a mixed solution of resin and particles, and the surface of the coating is provided with lotus-leaf-imitating firm conical micron-scale protrusions and a nano-scale rough structure. In the spraying process, liquid drops are atomized into 20-100 nm charged fog drops through high-voltage static electricity, the charged fog drops are assembled and stacked under the action of high-voltage electric field force to form the compact high-robustness super-hydrophobic coating, and the preparation method is simple and easy to implement, is not limited by a resin system and the variety of nanoparticles and is suitable for large-area industrial production. The prepared coating has excellent super-hydrophobicity and air layer stability, and still keeps good super-hydrophobicity under the ultrasonic action and the high static water pressure action. The coating can be applied to the fields of waterproofness, antifouling, corrosion prevention, biofilm adhesion prevention and the like of marine equipment such as ships, submarines, drilling platforms and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of super-hydrophobic coatings, in particular to a super-hydrophobic coating with a high robustness imitation lotus leaf structure, a preparation method and applications thereof. Background technique [0002] As we all know, superhydrophobic materials need to construct their low surface energy and micro-nano secondary rough structure. There are always pores of different scales on the superhydrophobic surface. When these pores are in contact with water, they form an air cushion at the interface, which in turn "lifts" the droplets to form a superhydrophobic state. The superhydrophobic microstructures prepared by some simple and portable methods such as air spraying, dipping, brushing, etc. tend to have large pores, and the firmness and compactness of the raised structures are poor, which is one of the poor durability of superhydrophobic materials. main reason. [0003] Among the existing prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/00B05D5/02B05D7/24B05D1/04C09D163/02C09D7/62
CPCB05D5/00B05D5/02B05D7/24B05D1/04C09D163/00C09D7/62C08K2201/011C08K2003/2275C08K9/06C08K3/36C08K3/22Y02T70/10
Inventor 吴楠孟芸芸邢素丽尹昌平江华阳
Owner NAT UNIV OF DEFENSE TECH
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