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outdoor sio 2 Superhydrophilic nano coating and preparation method thereof

A nano-coating, super-hydrophilic technology, applied in the coating and other directions, can solve the problem of not being able to obtain

Active Publication Date: 2021-04-09
上海西源新能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this anti-reflection film has certain roughness and wear resistance, there are deficiencies in both the anti-reflection film and its preparation method. First, the contact angle between the anti-reflection film and water is relatively large—reaching 11.3°; secondly, the preparation The method cannot obtain a product with a small contact angle with water and a durable outdoor hydrophilicity

Method used

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  • outdoor sio <sub>2</sub> Superhydrophilic nano coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The concrete steps of preparation are:

[0036] Step 1, first prepare ethyl tetrasilicate ethanol solution at a ratio of ethyl tetrasilicate and ethanol at a molar ratio of 1:18, and prepare an aqueous ammonia solution with a molar ratio of water and ammonia at a ratio of 5:0.5. Then according to the molar ratio of ethyl tetrasilicate in the ethyl tetrasilicate ethanol solution to the water in the aqueous ammonia solution of 1:5, the ethyl tetrasilicate ethanol solution was dropped into the aqueous ammonia solution drop by drop to obtain the alkali Catalytic reaction precursor solution.

[0037] Step 2, first put the alkali-catalyzed reaction precursor solution at 25°C and stir for 8 hours; wherein, the stirring rate is 500r / min to obtain SiO 2 Alkaline sol post aging 3d. After aging SiO 2 Add an aqueous solution of nitric acid with a concentration ≥ 66% to the alkaline sol to make the pH value 1, then add water, a mixture of ethanol and ethyl tetrasilicate to it in ...

Embodiment 2

[0041] The concrete steps of preparation are:

[0042] Step 1, first prepare ethyl tetrasilicate ethanol solution at a ratio of ethyl tetrasilicate and ethanol at a molar ratio of 1:19, and prepare an aqueous ammonia solution with a molar ratio of water and ammonia at a ratio of 5:0.45. Then according to the molar ratio of ethyl tetrasilicate in the ethyl tetrasilicate ethanol solution to the water in the aqueous ammonia solution of 1:5, the ethyl tetrasilicate ethanol solution was dropped into the aqueous ammonia solution drop by drop to obtain the alkali Catalytic reaction precursor solution.

[0043] Step 2, first put the base-catalyzed reaction precursor solution at 28°C and stir for 7.5h; wherein, the stirring rate is 500r / min to obtain SiO 2Alkaline sol post aging 4d. After aging SiO 2 Add an aqueous solution of nitric acid with a concentration ≥ 66% dropwise to the alkaline sol to make the pH value 1.3, then add water and a mixture of ethanol and ethyl tetrasilicate ...

Embodiment 3

[0047] The concrete steps of preparation are:

[0048] Step 1, first prepare ethyl tetrasilicate ethanol solution at a molar ratio of ethyl tetrasilicate and ethanol at a ratio of 1:20, and prepare an aqueous ammonia solution with a molar ratio of water and ammonia at a ratio of 5:0.4. Then according to the molar ratio of ethyl tetrasilicate in the ethyl tetrasilicate ethanol solution to the water in the aqueous ammonia solution of 1:5, the ethyl tetrasilicate ethanol solution was dropped into the aqueous ammonia solution drop by drop to obtain the alkali Catalytic reaction precursor solution.

[0049] Step 2, first place the base-catalyzed reaction precursor solution at 30°C and stir for 7 hours; wherein, the stirring rate is 500r / min to obtain SiO 2 Aging for 5 days after alkaline sol. After aging SiO 2 Add an aqueous solution of nitric acid with a concentration ≥ 66% dropwise to the alkaline sol to make the pH value 1.5, then add water, a mixture of ethanol and ethyl tet...

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Abstract

The invention discloses an outdoor SiO 2 Superhydrophilic nano coating and its preparation method. The coating is composed of a mesoporous acid film connected to a granular alkali film on a glass substrate; the method is to first drop the prepared ethyl tetrasilicate ethanol solution into the aqueous ammonia solution, and then stir and age the obtained alkali-catalyzed reaction precursor solution After, to the obtained aged SiO 2 Add nitric acid aqueous solution dropwise to the alkaline sol, then add water and a mixture of ethanol and ethyl tetrasilicate to it in turn, then, first stir the obtained acid-catalyzed reaction precursor solution containing alkali particle sol, and then wait for the obtained acid After the alkali composite sol is allowed to cool to room temperature, add a pore-forming agent to it and then age after stirring. Finally, the glass substrate is dipped in the obtained sol for coating to pull the coating and then dried, and then the obtained coating is Annealing the glass substrate to obtain the target product. It has high outdoor weather resistance, and it is very easy to be widely commercialized and applied in anti-fog, self-cleaning, wide-spectrum anti-reflection and other fields.

Description

technical field [0001] The invention relates to a nano-coating and a preparation method, in particular to a SiO coating for outdoor use 2 Superhydrophilic nano coating and its preparation method. Background technique [0002] SiO 2 Due to the presence of a large number of hydrophilic hydroxyl groups, the surface exhibits natural hydrophilicity. In order to make this naturally hydrophilic SiO 2 Obtaining superhydrophilicity, unremitting efforts have been made in the design of its surface structure, such as the title "Preparation of weather-resistant SiO by base-acid two-step catalysis 2 Research on anti-reflection coating", "Journal of Inorganic Chemistry", 2011, article on pages 823-827 of volume 27, issue 5. The weather resistance SiO mentioned in this article 2 The anti-reflection film is a composite structure of a dense linear acid film connected with a granular alkali film; the preparation method adopts the technical scheme of forming a film after compounding an alka...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/25
CPCC03C17/25C03C2217/213C03C2218/113C03C2218/32
Inventor 许少辉费广涛王彪张敏倪志龙
Owner 上海西源新能源技术有限公司
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