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Preparation method of super-hydrophobic silicon dioxide film

A super-hydrophobic, thin-film technology, applied in electrolytic coating, electrophoretic plating, coating, etc., to achieve the effect of simple operation, low requirements on the surface shape of the substrate, and simple process

Active Publication Date: 2015-09-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, electrophoresis is rarely used for the preparation of superhydrophobic films

Method used

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  • Preparation method of super-hydrophobic silicon dioxide film
  • Preparation method of super-hydrophobic silicon dioxide film
  • Preparation method of super-hydrophobic silicon dioxide film

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preparation example Construction

[0018] A preparation method for superhydrophobic film, comprising the following steps:

[0019] 1) After the metal substrate is sanded to 600 meshes, it is taken out after ultrasonication in ethanol for 10 minutes, washed and dried with tap water and deionized water, and then put into a 60 oC constant temperature drying box for use;

[0020] 2) Weigh nano-scale SiO 2 Disperse the powder in an ammonia solution with a pH of 8-12, stir it magnetically for 1 hour and set aside; add hydrophobic long-chain silane in another container and disperse it in ethanol or acetone, stir it magnetically for 1 hour and set aside, add the latter solution dropwise Into the previous solution, magnetically stirred for 6 hours to form a uniform suspension, aged for 2 to 6 hours, centrifuged, and the obtained white powder was dried in an oven at 60 °C to obtain superhydrophobic SiO 2 Powder; add 1~3g nano-sized SiO to every 100ml ethanol or acetone 2 powder and 2-10 mL hydrophobic long-chain silane...

Embodiment 1

[0025] The substrate is a commercial aluminum alloy substrate AA2024-T3, which is sanded to 600 mesh, ultrasonicated in ethanol for 10 minutes, taken out, cleaned and dried with tap water and deionized water, and then placed in a 60 oC constant temperature drying oven for use.

[0026] Preparation of Hydrophobic SiO 2 Solution preparation: solution 1 composition: weigh 1g nano-SiO 2 The powder is dispersed in a solution with pH = 8, and the pH of the solution is adjusted by using ammonia water, and it is used after magnetic stirring for 1 hour; the composition of solution 2: 2ml of hydrophobic silane or other hydrophobic polymers dispersed in 100ml of organic solvent ethanol, After 1 hour of magnetic stirring, it is ready for use; solution 3: add the above solution 2 to solution 1 drop by drop, form a uniform suspension after 6 hours of magnetic stirring, and age for 2 hours for use. The above solution 3 was separated by centrifugation, the rotation speed was controlled at 10...

Embodiment 2

[0032] Other steps are similar to embodiment 1 in the present embodiment, but preparation hydrophobic SiO 2 During the preparation process of the solution, the composition of the solution 1 is as follows: weigh 3g of nano-SiO 2 The powder is dispersed in a solution with pH = 12, and 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: 10ml of hydrophobic silane or other hydrophobic polymers dispersed in 100ml of organic solvent acetone, After 1 hour of magnetic stirring, it is ready for use; the substrate is a commercial aluminum alloy substrate AA2024-T3, and the hydrophobic SiO 2The mass fraction is 10%, and the resin binder content in the electrophoretic deposition solution is 10.0%. The electrophoretic deposition condition was 80 V, and the tested contact angle was 158.6 o.

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Abstract

The invention discloses a preparation method of a super-hydrophobic silicon dioxide film. The method comprises the steps: SiO2 powder with super-hydrophobicity is obtained by surface modification; an electrophoretic technique is adopted to deposit the SiO2 powder on a metal matrix to obtain the super-hydrophobic SiO2 film. The electrophoresis matrix mainly comprises galvanized steel, aluminium, magnesium, titanium and alloy thereof. The super-hydrophobic SiO2 powder is obtained by hydrolysis condensation reaction of nanoscale SiO2 powder and long chain organosilane such as dodecyltrimethoxysilane, hexadecyltrimethoxysilane, octadecyltrimethoxysilane or chlorine and fluorine hydrophobic silane such as octadecyltrichlorosilane and total fluorine octyl trimethoxy silane under an alkaline condition. An electrophoretic liquid consists of acetone or alcohol, water, modified super-hydrophobic SiO2 powder and resin binder. The super-hydrophobic film which is prepared by the method is mainly used for aspects such as metal protection, self-cleaning and surface water mist icing prevention. The method has the advantages that the operation is simple; the cost is relatively low; the condition is mild; and the method is expected to be applied to industrial production on a large scale.

Description

technical field [0001] The present invention relates to mildly superhydrophobic SiO 2 The preparation of thin film, especially relates to a preparation method of superhydrophobic silicon dioxide thin 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. The commonly used superhydrophobic surface preparation methods mainly include: dip coating method, hydrothermal synthesis method, chemical vapor deposition, and template method. However, these methods have disadvantages such as complex preparation process, long time required, and high requirements for equipment. [0003] Electrophoresis technology has the advantages of high resource utilization ...

Claims

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Application Information

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IPC IPC(8): C25D13/02C25D13/10
Inventor 胡吉明张雪芬侯旭望
Owner ZHEJIANG UNIV
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