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Preparation method of superhydrophilic transparent silica/titanium dioxide anti-fog film

A technology of silicon dioxide and titanium dioxide, which is applied in the field of preparation of super-hydrophilic transparent SiO2/TiO2 anti-fog film, can solve the problems of unmentioned film light transmittance, limited application range, etc.

Inactive Publication Date: 2015-10-28
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current research mainly focuses on the superhydrophilic TiO induced by UV light. 2 thin film, which greatly limits its use
There are few reports of superhydrophilic properties without ultraviolet light irradiation.
Chinese patent CN102503163A proposes a preparation method of titanium dioxide film with superhydrophilic properties under visible light, but the primary contact angle is 13°~15°, and the light transmittance of the film is not mentioned

Method used

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  • Preparation method of superhydrophilic transparent silica/titanium dioxide anti-fog film
  • Preparation method of superhydrophilic transparent silica/titanium dioxide anti-fog film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] After cleaning the glass sheet with washing liquid and deionized water, ultrasonically clean it with acetone, absolute ethanol and deionized water for 30 minutes respectively, then wash it again with deionized water, and dry it.

[0020] Measure 30ml of absolute ethanol, add a mixture of 1ml of concentrated ammonia water and 3ml of deionized water, stir at 25°C for 30min, add 5ml of tetraethyl orthosilicate, and continue stirring for 3h to obtain nano-SiO 2 Sol.

[0021] Measure 30ml of absolute ethanol, add 0.5ml of concentrated nitric acid and 0.25ml of acetylacetone in sequence, stir at 25°C for 30min, add 5ml of tetrabutyl titanate and 1.5ml of deionized water, and continue stirring for 3h to obtain nano-TiO 2 Sol.

[0022] In SiO 2 Concentrated nitric acid was added to the sol to adjust the pH to 3~4, and the above TiO 2 The sol is all added to SiO 2 In the sol, stir for 3h to obtain nano-SiO 2 / TiO 2 Sol, aged for 12h.

[0023] Using the spin coating metho...

Embodiment 2

[0027] After cleaning the glass sheet with washing liquid and deionized water, ultrasonically clean it with acetone, absolute ethanol and deionized water for 30 minutes respectively, then wash it again with deionized water, and dry it.

[0028] Measure 60ml of absolute ethanol, add a mixture of 2ml of concentrated ammonia water and 6ml of deionized water, stir at 25°C for 30min, add 10ml of tetraethyl orthosilicate, and continue stirring for 3h to obtain nano-SiO 2 Sol.

[0029] Measure 30ml of absolute ethanol, add 0.5ml of concentrated nitric acid and 0.25ml of acetylacetone in sequence, stir at 25°C for 30min, add 5ml of tetrabutyl titanate and 1.5ml of deionized water, and continue stirring for 3h to obtain nano-TiO 2 Sol.

[0030] In SiO 2 Add concentrated nitric acid or concentrated hydrochloric acid to the sol, adjust the pH to 3~4, and mix the above TiO 2 The sol is all added to SiO 2 In the sol, stir for 3h to obtain nano-SiO 2 / TiO 2 Sol, aged for 12h.

[0031...

Embodiment 3

[0035] After cleaning the glass sheet with washing liquid and deionized water, ultrasonically clean it with acetone, absolute ethanol and deionized water for 30 minutes respectively, then wash it again with deionized water, and dry it.

[0036] Measure 30ml of absolute ethanol, add a mixture of 1ml of concentrated ammonia water and 2ml of deionized water, stir at 25°C for 30min, add 5ml of tetraethyl orthosilicate, and continue stirring for 3h to obtain nano-SiO 2 Sol.

[0037] Measure 30ml of absolute ethanol, add 0.5ml of concentrated hydrochloric acid and 0.25ml of acetylacetone in sequence, stir at 25°C for 30min, add 5ml of tetrabutyl titanate and 2ml of deionized water, and continue stirring for 3h to obtain nano-TiO 2 Sol.

[0038] In SiO 2 Concentrated hydrochloric acid was added to the sol to adjust the pH to 3~4, and the above TiO 2 The sol is all added to SiO 2 In the sol, stir for 3h to obtain nano-SiO 2 / TiO 2 Sol, aged for 24h.

[0039] Using the spin coa...

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Abstract

The invention provides a preparation method of ultra-hydrophilic transparent SiO2 / TiO2 antifog film. The preparation method employs a sol-gel method, and comprises the following steps: preparing a nanometer SiO2 sol by using ethyl orthosilicate as raw material; preparing a nanometer TiO2 sol using tetrabutyl titanate as raw material; preparing a SiO2 / TiO2 sol by mixing SiO2 sol and TiO2 sol according to a ratio; preparing films of different layers by coating a pretreated glass base material with the SiO2 / TiO2 sol by using a spin coating mode; and then placing the material in a muffle furnace for annealing. The invention has the advantages of simple equipment and low cost, and the SiO2 / TiO2 film has super hydrophilicity and high light transmittance under visible light, and can be used for building glass, wind screen glass, bathroom glass and various antifog occasions.

Description

technical field [0001] The invention belongs to the field of superhydrophilic thin films, in particular to a superhydrophilic transparent SiO 2 / TiO 2 The preparation method of anti-fog film. technical background [0002] In a high-humidity environment, car windshields, rearview mirror surfaces, traffic signs, and warning signs are prone to fogging, which will have a great impact on the transmission of light and affect the driver's vision; bathroom glass and mirrors, lenses 1. The fogging of lighting fixtures will also bring a lot of inconvenience to people's lives. Surface wettability is an important physicochemical property of a solid surface, measured by the static or dynamic contact angle of a liquid. The so-called super-hydrophilic means that when the contact angle between the water droplet and the solid surface is less than 5°, the super-hydrophilic surface can make the water vapor condense on the surface of the substrate and spread to a high degree, forming a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/23
Inventor 曾琦琪何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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