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Preparation method of nano TiO2 self-cleaning transparent coating

A technology of nano-titanium dioxide and transparent coating, which is applied in coatings, polyurea/polyurethane coatings, etc., can solve the problems of difficult control of film particle size, high equipment requirements, and inability to form large-scale uniform films, achieving good market prospects and The effect of application value, low cost, and high visible light transmittance

Active Publication Date: 2013-05-15
山东惠中新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Preparation of nano-TiO in the prior art 2 Thin-film methods include: magnetron sputtering, chemical vapor deposition, and sol-gel methods. These preparation methods have disadvantages such as high equipment requirements, difficulty in controlling the particle size of the film, and inability to form a large-area uniform film. Nano-TiO 2 The powder is directly applied to the coating, and dispersed in an aqueous solvent by ball milling / ultrasonic / high-speed stirring to obtain TiO 2 It is a simple and convenient method to prepare a transparent coating with the same properties as the coating by coating the nano-coating on ordinary glass

Method used

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Examples

Experimental program
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Embodiment 1

[0018] Embodiment 1, nano-TiO 2 Add the powder into the dispersant absolute ethanol, adjust the pH value at 7-8 to be alkaline, fully disperse and mix, put the mixture in a ball mill for 24 hours, and add a stabilizer at the same time to obtain dispersed nano-TiO 2 Slurry system, wherein the milling balls are agate beads with a diameter of 2-2.8 cm, and the rotation speed is 250 r / min. The prepared nano-TiO 2 The volume ratio of slurry and water-based polyurethane is V 纳米TiO2浆料 :V 水性聚氨酯 = 1:6 mixing, control the pH value to 7~8, and then carry out ball mill dispersion. During the dispersion process, add defoamer, leveling agent, and thickener to water-based polyurethane according to 0.1wt%, 4wt%, and 0.2wt% respectively. In the preparation of nano-TiO 2 coating. Ordinary glass slides soaked in NaOH solution were ultrasonically cleaned in acetone, absolute ethanol, and deionized water for 15 minutes, and the pulling method was used to pull a film on a clean glass substrat...

Embodiment 2

[0019] Embodiment 2, nano-TiO 2 Add the powder into the dispersant n-butanol, adjust the pH value at 7-8 to be alkaline, fully disperse and mix, put the mixture into an ultrasonic generator for ultrasonic dispersion for 50 min, and add a stabilizer at the same time to obtain dispersed nano-TiO 2 Slurry system, wherein the ultrasonic generator frequency is 20000Hz. The prepared nano-TiO 2 The volume ratio of slurry and water-based polyurethane is V 纳米TiO2浆料 :V 水性聚氨酯 = 1:10 mixing, control the pH value to 7~8, and then carry out ball mill dispersion. During the dispersion process, add defoamer, leveling agent, and thickener to water-based polyurethane in sequence at 0.1wt%, 4wt%, and 0.2wt%. In the preparation of nano-TiO 2 coating. Ordinary glass slides soaked in NaOH solution were ultrasonically cleaned in acetone, absolute ethanol, and deionized water for 15 minutes, and the pulling method was used to pull a film on a clean glass substrate. The number of pulls can be ch...

Embodiment 3

[0020] Embodiment 3, nano-TiO 2 Add the powder into the dispersant n-butanol, adjust the pH value at 7-8 to be alkaline, fully disperse and mix, put the mixture in a ball mill for 48 hours, and add a stabilizer at the same time to obtain dispersed nano-TiO 2 Slurry system, wherein the milling balls are agate beads with a diameter of 2-2.8 cm, and the rotation speed is 250 r / min. The prepared nano-TiO 2 The ratio of slurry and water-based polyurethane is V 纳米TiO2浆料 :V 水性聚氨酯 = 1:6 mixing, control the pH value to 7~8, and then carry out ball mill dispersion. During the dispersion process, add defoamer, leveling agent, and thickener to water-based polyurethane according to 0.1wt%, 4wt%, and 0.2wt% respectively. In the preparation of nano-TiO 2 coating. Ordinary glass slides soaked in NaOH solution were ultrasonically cleaned in acetone, absolute ethanol, and deionized water for 15 min, and coated on a clean glass substrate by wire bar coating method, using an oven of 80 o C...

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Abstract

The invention discloses a preparation method of a nano TiO2 self-cleaning transparent coating. The method comprises the following steps: 1) preparation of a nano TiO2 slurry: mixing a nano TiO2 powder and a dispersant according to proportion and stirring thoroughly, and regulating a pH value to prepare the nano TiO2 slurry; 2) preparation of a nano TiO2 self-cleaning coating: mixing the nano TiO2 slurry and aqueous polyurethane, adjusting a pH value, adding a leveling agent, a defoaming agent and a thickener for dispersion, so as to prepare a nano self-cleaning coating; and 3) preparation of a nano TiO2 self-cleaning transparent coating: immersing a clean glass substrate in the prepared nano self-cleaning coating liquid, and preparing a transparent coating on the glass substrate by using a spin coating method / Czochralski method / bar coating method. The nano TiO2 transparent coating prepared by the method provided by the invention has high visible light transmittance and self-cleaning function, and is suitable for the field of building glass, such as antimicrobial coating and doors and window.

Description

technical field [0001] The invention belongs to the technical field of functional glass, in particular to a preparation method of a self-cleaning transparent coating of nano titanium dioxide. Background technique [0002] Titanium dioxide is a semiconductor material with strong redox ability, which can oxidize or decompose various pollutants at room temperature, and has the function of removing these pollutants. When the material enters the nanometer scale, the increase of the surface active center can improve its chemical and photocatalytic reaction ability. Under the action of ultraviolet light and oxygen, the material coating has the ability of self-cleaning. The surface active center and the functional group of the film-forming substance can produce chemical bonds. Combined, the rigidity and strength of the coating are greatly increased, which can further improve the scratch resistance of the coating. Generally speaking, nano-coatings must meet two conditions: first, at...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D7/12C03C17/32
Inventor 黄延伟张国彬季振国
Owner 山东惠中新材料科技有限公司
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