Nanometer composite hydrophobic hard transparent film and preparation method thereof

A nano-composite, transparent film technology, applied in chemical instruments and methods, other chemical processes, etc., can solve problems affecting industrial production, complex processes, etc., and achieve the effect of improving service life, high purity, and preventing snow accumulation.

Inactive Publication Date: 2010-01-20
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The preparation of a hard transparent film with hydrophobic properties and high mechanical strength also has the disadvantage of complex process, which affects the needs of actual industrial production

Method used

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  • Nanometer composite hydrophobic hard transparent film and preparation method thereof
  • Nanometer composite hydrophobic hard transparent film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1), preparation of silica sol

[0041] SiO 2 Content is 28.4% orthoethyl silicate (TEOS), absolute ethanol, water and pH are the hydrochloric acid of 2.56 molar ratio: 1: 3.8: 1: 5 * 10 -5 Mix, hydrolyze, stir at 60°C for 90 minutes, let the sol cool to room temperature to obtain a partially hydrolyzed and polycondensed silica sol, and let it stand for about 12 hours;

[0042]Add HCl and water with a volume ratio of 0.035:1 to the partially hydrolyzed and polycondensed silica sol obtained by naturally cooling to room temperature, so that the concentration of the partially hydrolyzed and polycondensed silica sol reaches 0.01M, and stir at room temperature for 15 minutes. Aging sol at 50°C for about 0 to 16 hours, then drop in ethanol with a concentration of 99.7% for dilution, let it stand for about 5 hours, then add methyltriethoxysilane, and finally react to form silica sol;

[0043] The molar ratio of the final reagent is tetraethyl orthosilicate (TEOS): ethanol: w...

Embodiment 2

[0052] (1), preparation of silica sol

[0053] SiO 2 Content is 28.4% orthoethyl silicate (TEOS), absolute ethanol, water and pH are 2.56 hydrochloric acid molar ratio: 1: 3.8: 1: 5 × 10 -5 Mix, hydrolyze, stir at 60°C for 90 minutes, let the sol cool to room temperature to obtain a partially hydrolyzed and polycondensed silica sol, and let it stand for about 12 hours;

[0054] Add HCl and water with a volume ratio of 0.035:1 to the partially hydrolyzed and polycondensed silica sol obtained by naturally cooling to room temperature to make the concentration of the partially hydrolyzed and polycondensed silica sol reach 0.01M. Aging sol at ℃ temperature for about 0~16h, then dripping ethanol with a concentration of 99.7% to dilute and let stand for about 5h, then add methyltriethoxysilane, and finally react to form silica sol;

[0055] The molar ratio of the final reagent is tetraethyl orthosilicate (TEOS): ethanol: water: hydrochloric acid: organosilylmethyltriethoxysilane (M...

Embodiment 3

[0064] (1), preparation of silica sol

[0065] SiO 2 Content is 28.4% tetraethyl orthosilicate (TEOS), absolute ethanol, water and pH 2.56 hydrochloric acid molar ratio: 1: 3.8: 1: 5 × 10 -5 Mix, hydrolyze, stir at 60°C for 90 minutes, let the sol cool to room temperature to obtain a partially hydrolyzed and polycondensed silica sol, and let it stand for about 12 hours;

[0066] Add HCl and water with a volume ratio of 0.035:1 to the partially hydrolyzed and polycondensed silica sol obtained by naturally cooling to room temperature to make the concentration of partially hydrolyzed and polycondensed silicon reach 0.01M. Aging sol at high temperature for about 0 to 16 hours, then dripping ethanol with a concentration of 99.7% to dilute and let stand for about 5 hours, then add methyltriethoxysilane, and finally react to form silica sol;

[0067] The molar ratio of the final reagent is tetraethyl orthosilicate (TEOS): ethanol: water: hydrochloric acid: organosilylmethyltriethox...

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Abstract

The invention discloses a nanometer composite hydrophobic hard transparent film and a preparation method thereof, belonging to the nanometer technical field. The preparation method of the nanometer composite hydrophobic hard transparent film comprises the preparation of silicon dioxide sol, the preparation of aluminium sol, the preparation of composite sol, film-plating and other steps. The hardness of the finally obtained nanometer composite hydrophobic hard transparent film of the invention can reach 5h which is detected by a QHQ type pencil hardness gauge and SL100 type static contact angle admeasuring apparatus, and the hydrophobic angle can reach 115 degrees so that the nanometer composite film has excellent mechanical properties and hydrophobic function. The obtained nanometer composite hydrophobic hard transparent film in the invention can be used on the surface of different devices so as to prevent or reduce the adhesion of steam, ice and snow and other pollutants and has broad application prospect in national defense, aviation, aerospace, everyday life and other industrial fields.

Description

technical field [0001] The invention relates to a nanocomposite hydrophobic hard transparent film and a preparation method thereof, belonging to the field of nanotechnology. Background technique [0002] The transparent composite film with a certain hardness and hydrophobicity is widely used in many fields. In recent years, the preparation of thin film coatings with hydrophobic surfaces has become an important direction of material science. Due to the unique surface characteristics of hydrophobic films, the use of such films on the surfaces of different devices can prevent or reduce water vapor, ice and snow and other pollution. It has broad application prospects in national defense, aviation and aerospace daily life and many industrial fields. However, in some practical applications, the main disadvantage of some hydrophobic films limiting their application is that their scratch resistance is relatively poor, and their hardness cannot meet the needs of some objects. Abras...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/18
Inventor 姚兰芳谢伏将
Owner UNIV OF SHANGHAI FOR SCI & TECH
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