A kind of preparation method of wear-resistant superhydrophobic film

A super-hydrophobic and thin-film technology, applied in the direction of electrolytic inorganic material coating, electrolytic coating, electrophoretic plating, etc., can solve the problems of damage, limited heat resistance, and matrix damage, and achieve low facility requirements, low material cost, and combined strong effect

Active Publication Date: 2018-05-22
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the first method above has the disadvantage of limited heat resistance, and the second method, since it is a destructive technique, causes damage to the substrate

Method used

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  • A kind of preparation method of wear-resistant superhydrophobic film
  • A kind of preparation method of wear-resistant superhydrophobic film
  • A kind of preparation method of wear-resistant superhydrophobic film

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preparation example Construction

[0020] A preparation method of wear-resistant super-hydrophobic film, comprising the following steps:

[0021] 1) After the metal substrate is polished to 600 mesh by sandpaper, it is taken out after ultrasonication in ethanol for 10 minutes, washed and dried by tap water and deionized water, and then put into a constant temperature drying oven at 60°C for use;

[0022] 2) Measure 50mL of ethanol, 0.2M NaNO 3 After mixing, add 5 mL of tetraethyl orthosilicate, adjust the pH of the solution to about 4.5, and stir it magnetically for 12 hours before use.

[0023] 3) Using a three-electrode system to electrodeposit a layer of SiO on the metal with high mechanical strength, good bonding force, and a highly porous structure 2 Thin film, wherein the working electrode is a metal substrate, Pt sheet and Ag / AgCl (saturated KCl) electrode are used as counter electrode and reference electrode respectively, the applied potential is -1.0V~-2.0V, and the electrodeposition time is 200~600s...

Embodiment 1

[0029] The substrate is a commercial aluminum alloy substrate AA2024-T3, which is sanded to 600 meshes, ultrasonicated in ethanol for 10 minutes, taken out, cleaned and dried with tap water and deionized water, and then placed in a constant temperature drying oven at 60°C for use.

[0030] Hydrophobic SiO 2 Preparation of powder:

[0031] Solution 1 composition: weigh 1g nano-SiO 2 The powder is dispersed in a solution of 100mL pH=8, wherein the control of the pH of the solution is adjusted by ammonia water, and it is used after magnetic stirring for 1 hour; the composition of solution 2: disperse 5mL of dodecyltrimethoxysilane in 100mL of ethanol, magnetic After stirring for 1 h, set aside. The above-mentioned solution 2 was added dropwise to the solution 1, and a uniform suspension was formed after magnetic stirring for 6 hours, and aged for 4 hours for later use. After centrifugation (the rotation speed is controlled at 10000r / min, and the separation time is 10min), the ...

Embodiment 2

[0038] Other steps in this example are similar to Example 1, still using aluminum alloy as the substrate, but electrodepositing SiO 2 The deposition potential of the film is -2.0V, and the deposition time is 200s. Under the above process conditions, a friction test that can withstand ~20 cycles can also be obtained, and the contact angle of the sample is always maintained at about 159°.

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Abstract

The invention discloses a preparation method for a wear-resisting super-hydrophobic thin film. Firstly, the electro-deposition technology is adopted for preparing a layer of SiO2 thin film on a metal base body, wherein the SiO2 thin film is high in mechanical strength and good in bonding force and is of a highly porous structure; and then the electrophoretic technology is adopted for filling a hole way of the above SiO2 thin film with super-hydrophobicity nanometer SiO2 powder subject to surface modification, and therefore the super-hydrophobic thin film with the excellent wear-resisting performance is obtained. The super-hydrophobicity nanometer SiO2 powder is prepared through graft modification of nanoscale SiO2 powder and long-chain organosilane like dodecyltrimethoxysilane, hexadecyltrimethoxysilane, octadecyltrimethoxysilane or hydrophobicity silane containing chlorine, fluorine and the like under the alkaline condition, wherein the hydrophobicity silane containing chlorine, fluorine and the like include octadecyltrichlorosilane, perfluor octyl group trimethoxy silane and the like. The method for preparing the super-hydrophobic thin film is simple in operation, low in cost and soft in condition and is expected to be applied to industrial production in large scale.

Description

technical field [0001] The invention relates to the gentle preparation of a wear-resistant super-hydrophobic film, in particular to a preparation method of a wear-resistant super-hydrophobic silicon dioxide film. Background technique [0002] Superhydrophobic material refers to a special material with a contact angle greater than 150° and a rolling angle less than 10°. In recent years, superhydrophobic materials have been widely used in many fields, such as surface self-cleaning, surface antifreeze, metal protection, etc., by taking advantage of their special "non-stick" characteristics. However, most of the superhydrophobic film materials prepared by conventional methods have disadvantages such as poor mechanical properties and poor wear resistance, which largely limit their practical applications. [0003] Superhydrophobic surfaces with good wear resistance are currently prepared by two basic approaches. One is that the use of flexible materials (such as fabrics, cotton,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D9/04C25D13/02
CPCC25D9/04C25D13/02
Inventor 胡吉明张雪芬
Owner ZHEJIANG UNIV
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