Preparation method of anti-reflection self-cleaning coated glass

A coated glass and self-cleaning technology, which is applied in the field of preparation of anti-reflection and self-cleaning coated glass, can solve the problems of poor UV aging resistance, unsatisfactory self-cleaning effect, and inability to achieve super-hydrophilicity, etc., and achieve UV aging resistance Excellent, improve the visible light transmittance, reduce the temperature effect

Inactive Publication Date: 2013-05-08

上海圣元新能源科技有限公司

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Problems solved by technology

In this patent, hydrothermal pretreatment of the glass substrate is required, and the required equipment and processes are complex, making it difficult to realize industrialization

At present, the self-cleaning coated glass prepared by the sol-gel method often needs to be baked at a relatively high temperature (gene...

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Abstract

The invention discloses a preparation method of anti-reflection self-cleaning coated glass, which comprises the steps of preparing a SiO2-TiO2 composite sol firstly, then carrying out film coating by using a pulling method, and forming a coarse nano thin film layer on the surface of a glass substrate through the SiO2-TiO2 composite sol; and finally, carrying out low-temperature post-treatment on the obtained product so as to obtain coated glass. By using the preparation method disclosed by the invention, the visible light transmittance of the prepared coated glass can be improved, the light transmittance is increased by 2-3%, and the prepared coated glass can achieve a photocatalytic self-cleaning effect. The preparation method disclosed by the invention is simple, a glass substrate is not required to be subjected to complex pretreatment, and coated glass is not required to be subjected to high-temperature baking. The coated glass prepared by using the method disclosed by the invention has excellent ultraviolet aging resistance; and because a coated layer is a nano film, and the surface of the nano film has a proper roughness, the nano film can achieve a physical hydrophilic effect, so that the coated layer on the surface of the glass substrate also can have a super-hydrophilic self-cleaning performance under the condition of no light.

Technology Topic

TransmittanceFilm coating +5

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Example Embodiment

[0023] The present invention relates to a preparation method of antireflection self-cleaning coated glass, which comprises the following steps:

[0024] Step 1. Preparation of SiO 2 -TiO 2 Composite sol: incorporating nano-SiO 2 Sol and Nano TiO 2 The sol is mixed according to the silicon-titanium molar ratio of 1:5 to 30, stirred evenly, then dropwise added an acid catalyst to adjust the pH value of the mixed sol to 2 to 4, and continued stirring to obtain the SiO 2 -TiO 2 composite sol;

[0025] Step 2. Coating by pulling method: first put the clean glass substrate on the pulling machine, and then put the glass substrate on the SiO 2 -TiO 2 After fully immersing in the composite sol for 5-20 minutes, pull it upwards at a pulling rate of 1-20 cm/min, and then let the glass substrate with the wet film attached to it air-dry at room temperature for 10-20 minutes, and the surface of the glass substrate forms a surface. a nano-film layer with roughness;

[0026] Step 3, post-treatment after pulling and coating: soak the glass substrate coated in step 2 in alkaline solution for 10-120 minutes, then take it out for drying, and cool it naturally to obtain the anti-reflection self-cleaning coated glass.

Example Embodiment

[0027] Example 1

[0028] Step 1. Preparation of TiO 2 Sol:

[0029] Anatase TiO 2 The powder is completely dissolved in deionized water, anatase TiO 2 The molar ratio of powder to deionized water is 1:5 to obtain the TiO 2 sol;

[0030] Step 2. Preparation of SiO 2 Sol:

[0031] Weigh ethyl orthosilicate, absolute ethanol, deionized water and acid catalyst (30% nitric acid aqueous solution) in a molar ratio of 1:15:1:0.001, and dilute ethyl orthosilicate with absolute ethanol. The mixed solution of acid catalyst and deionized water was added dropwise, and the above mixed solution was stirred and reacted at 20° C. for 4 hours, then allowed to stand for aging for 1 day, and then the reacted mixed solution was diluted 1.2 times with additional absolute ethanol to obtain The SiO 2 Sol, spare;

[0032] Step 3. Preparation of SiO 2 -TiO 2 Compound sol:

[0033] The nano-SiO 2 Sol and Nano TiO 2 The sol is mixed according to the molar ratio of silicon and titanium to 1:5, stirred evenly, then dropwise added an acid catalyst (30% nitric acid solution) to adjust the pH value of the mixed sol to 2 to 4, and continued stirring to obtain the SiO 2 -TiO 2 composite sol;

[0034] Step 4. Coating by pulling method:

[0035] First put the clean glass substrate on the pulling machine, and then put the glass substrate on the SiO 2 -TiO 2 After being fully immersed in the composite sol for 5 minutes, it was pulled upward at a pulling rate of 5 cm/min, and then the glass substrate with the wet film attached was left to dry at room temperature for 20 minutes, and a layer of nanometer-sized particles with roughness was formed on the surface of the glass substrate. film layer;

[0036] Step 5. Post-processing after pulling and coating:

[0037] The glass substrate coated in step 2 is soaked in ammonia water alkali solution with a pH value of 7.5 for 60 minutes, then taken out and dried at 80° C. and then cooled naturally to obtain the antireflection self-cleaning coated glass.

Example Embodiment

[0038] Example 2

[0039] Step 1. Preparation of TiO 2 Sol:

[0040] Anatase TiO 2 The powder is completely dissolved in deionized water, anatase TiO 2 The molar ratio of powder to deionized water is 1:30 to obtain the TiO 2 sol;

[0041] Step 2. Preparation of SiO 2 Sol:

[0042] Weigh ethyl orthosilicate, anhydrous ethanol, deionized water and acid catalyst (20% aqueous sulfuric acid) in a molar ratio of 1:30:5:0.01, dilute ethyl orthosilicate with absolute ethanol, dropwise The mixed solution of acid catalyst and deionized water was added, the above mixed solution was ultrasonically reacted at 30°C for 20 minutes, then left to stand for aging for 2 days, and the reacted mixed solution was diluted 0.8 times with additional absolute ethanol to obtain the obtained solution. SiO 2 Sol, spare;

[0043] Step 3. Preparation of SiO 2 -TiO 2 Compound sol:

[0044] The nano-SiO 2 Sol and Nano TiO 2 The sol is mixed at a molar ratio of silicon to titanium of 1:30, stirred evenly, and then an acid catalyst (20% sulfuric acid aqueous solution) is added dropwise to adjust the pH of the mixed sol to 2 to 4, and the SiO is obtained by continuing to stir evenly. 2 -TiO 2 composite sol;

[0045] Step 4. Coating by pulling method:

[0046] First put the clean glass substrate on the pulling machine, and then put the glass substrate on the SiO 2 -TiO 2 After being fully immersed in the composite sol for 20 minutes, it was pulled upward at a pulling rate of 15 cm/min, and then the glass substrate with the wet film attached was left to dry for 15 minutes at room temperature, and a layer of nanometer-sized particles with roughness was formed on the surface of the glass substrate. film layer;

[0047] Step 5. Post-processing after pulling and coating:

[0048] The glass substrate coated in step 2 was soaked in an ammonia water ethanol solution with a pH value of 8.5 for 20 minutes, then taken out and dried at 120° C. and then cooled naturally to obtain the anti-reflection self-cleaning coated glass.

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