Method for preparing ultraviolet-resistant TiO2 film

Abstract

The invention discloses a method for preparing an ultraviolet-resistant TiO2 film. The method comprises the following steps: mixing a silane coupling agent (KH-570), tetraisopropyl titanate and anhydrous benzyl alcohol according to a certain molar ratio, pouring the mixture into a reaction kettle with a polytetrafluoroethylene lining for heating, cleaning the generated TiO2 nanoparticles by using absolute ethyl alcohol, removing the supernatant liquid, dispersing the liquid into xylene, and adding oleic acid for stabilizing; respectively adding titanium dioxide nanoparticles and xylene into 100ml of oleic acid according to a certain ratio for performing ultrasonic treatment, spinning the obtained stable solution by using a spin coater, obtaining a TiO2 film, and measuring by using an ellipsometer, so that the needed film thickness is guaranteed; and annealing the prepared composite material film in a drying box, thereby obtaining the TiO2 film with high transparency and ultraviolet shielding resistance. According to the TiO2 film prepared by the invention, the phenomenon that the material is yellowed and darkened due to light degradation is avoided, and the TiO2 film is durable in use and has a good effect of blocking ultraviolet light under the condition that high transmittancy is maintained.

Description

Background technique [0001] With the aggravation of pollution, the ozone layer is getting thinner day by day, and more ultraviolet components in sunlight reach the earth's surface. In addition, other sources of ultraviolet rays such as industrial production are also gradually increasing. This requires us to do more in-depth research on the hazards of this electromagnetic radiation, and to further develop new materials to selectively protect against ultraviolet light. Polymers absorb UV light and generate free radicals that cause photodegradation, resulting in discoloration, darkening, and loss of mechanical strength and impact resistance of the polymer. For human tissues, the impact of ultraviolet rays can cause various light-sensitive skin diseases, even skin cancer. Therefore, UV protection materials have always been a hot spot in material science research, and it is still the case today. [0002] Wide bandgap metal oxide semiconductor materials are commonly used ultraviol...

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Problems solved by technology

[0004] Comparison: (1) The ability to absorb light is similar, and our visible light transmittance is not as high as the above patent, which is 10% worse

(2) With a particle size of 5 nanometers, the catalytic effect of ZnO will be more obvious, leading to polymer degradation, while polymers (including common transparent polymers such as PMMA and PS) have absorption in the ultraviolet region, which will also lead to degradation. After a period of time under light, it will turn yellow and darken, which will affect the transparency of visible light. Because of the problem of photodegradation, the polymer will not be durable, and there are nanoparticles that are easy to agglomerate. If the dispersion in the polymer is not enough Below 40 nanometers, the transparency is not easy to meet the requirements

The article did not mention the specific transparency, but because CeO 2 There is absorption in the visible light region, so the transmittance should not be as good as TiO 2 formed film

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