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Preparation method of silicon dioxide super-hydrophobic thin film and super-hydrophobic material

A silicon dioxide and super-hydrophobic technology, applied in chemical instruments and methods, other chemical processes, coatings, etc., can solve problems such as difficulty in obtaining micro-nano structures, complex processes, and application limitations, and achieve good surface hydrophobicity, Simple process and wide application range

Inactive Publication Date: 2013-10-23
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the technical problems that the existing sol-gel method prepares silica superhydrophobic film, it is difficult to obtain an ideal micro-nano structure, or the process is complex and the application is limited.

Method used

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Examples

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Effect test

preparation example Construction

[0022] The invention provides a method for preparing a silicon dioxide superhydrophobic film, which adopts a new sol-gel method to form a silicon dioxide superhydrophobic film on the surface of a substrate; this sol-gel method is different from that mentioned in the background technology The sol-gel method is embodied in that the sol-gel method of the present invention first prepares SiO 2 Alkaline sol, then add hexamethyldisilazane to react to get modified SiO 2 sol, and then the above modified SiO 2 The sol is sprayed on the surface of the substrate, and after drying, a silicon dioxide superhydrophobic film is obtained. Specifically, the preparation method of silicon dioxide superhydrophobic film of the present invention, comprises the following steps:

[0023] Step 1. Preparation of alkaline sol: mix orthosilicate, alkaline catalyst, solvent, and water to prepare SiO 2 Alkaline sol;

[0024] In this step, the orthosilicate, water, alkaline catalyst and solvent are mixed...

Embodiment 1

[0044] This embodiment 1 is used to illustrate the preparation method of silicon dioxide superhydrophobic film provided by the present invention:

[0045] The raw materials needed for the preparation method of the present embodiment 1 include: ethyl orthosilicate (Si(C 2 h 5 O) 4 ), water (H 2 O), anhydrous ethylenediamine (NH 2 (CH2) 2 NH 2 ), ethanol (C 2 h 5 OH), hexamethyldisilazane ((CH 3 ) 3 SiNH 2 Si(CH 3 ) 3 ); the molar ratio is: 0.8:2:0.6:30:1.2, wherein, tetraethyl orthosilicate is used as a reaction precursor, water is used as a reactant, anhydrous ethylenediamine is used as a catalyst, and absolute ethanol is used as a solvent for the reaction; Embodiment 1 specifically comprises the following steps:

[0046] Step 1. Preparation of alkaline sol: 1. First mix 15mol ethanol with 0.8mol tetraethyl orthosilicate, fully stir under the mechanical stirring of the stirrer, and the stirring time is 1 hour, so that the tetraethyl orthosilicate is fully disperse...

Embodiment 2

[0050] This Example 2 is used to illustrate the preparation method of the silicon dioxide superhydrophobic film provided by the present invention. The difference from Example 1 is that the ratio of raw materials is different, and the obtained modified SiO 2 The sol particles in the sol are of different sizes;

[0051] The raw materials needed for the preparation method of the present embodiment 2 include: ethyl orthosilicate (Si(C 2 h 5 O) 4 ), water (H 2 O), anhydrous ethylenediamine (NH 2 (CH2) 2 NH 2 ), ethanol (C 2 h 5 OH), hexamethyldisilazane ((CH 3 ) 3 SiNH 2 Si(CH 3 )3 ); the molar ratio is: 1.4:4:1.0:50:2.0, wherein, tetraethyl orthosilicate is used as a reaction precursor, water is used as a reactant, anhydrous ethylenediamine is used as a catalyst, and absolute ethanol is used as a solvent for the reaction; Embodiment 2 specifically comprises the following steps:

[0052] Step 1. Preparation of alkaline sol: 1. First mix 25mol ethanol with 1.4mol ethyl ...

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Abstract

The invention provides a preparation method of a silicon dioxide super-hydrophobic thin film. The preparation method comprises the following steps of: step one. preparing alkaline colloidal sol, namely mixing orthosilicate ester, a basic catalyst, a solvent and water to prepare the SiO2 alkaline colloidal sol; step two. adding hexamethyl disilazane to the SiO2 alkaline colloidal sol for reaction to obtain modified SiO colloidal sol; and step three. coating the modified SiO colloidal sol on the surface of a substrate, and drying to obtain the silicon dioxide super-hydrophobic thin film. The invention also provides a super-hydrophobic material. The silicon dioxide super-hydrophobic thin film prepared by the method has strong adhesion force with a substrate and a good dewatering effect; complicated equipment is not needed; the process is simple; the preparation cycle is shortened; the cost is saved; and the application range is wide.

Description

technical field [0001] The invention relates to the field of superhydrophobic materials, more specifically, to a method for preparing a silicon dioxide superhydrophobic film and a superhydrophobic material. Background technique [0002] The wettability of the material surface is an important property of the material. Many physical and chemical processes, such as friction, dispersion, adhesion, adsorption, etc., are closely related to the wettability of the material surface. Generally, a solid surface with a contact angle with water greater than 150° and a hysteresis angle less than 10° is considered a superhydrophobic surface, and the superhydrophobic surface is a surface with a certain roughness, and the surface with a certain roughness Modification of low surface energy modifiers. In recent years, superhydrophobic surfaces with a contact angle greater than 150° with water have attracted great attention, because superhydrophobic surfaces can be widely used in self-cleaning...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/23C04B41/85C09K3/18C09D1/00
Inventor 赵严帅黎宪宽周维
Owner BYD CO LTD
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