Preparation method of water-based ultraviolet barrier coating based on ZnO quantum dots

A quantum dot and external shielding technology, which is applied in the field of fine chemicals, can solve the problems that cannot be prepared with high weather resistance and high transparency water-based UV shielding coatings, does not consider the photocatalytic activity of ZnOQDs, ZnOQDs instability and other problems, and achieves UV shielding performance Long-term stability, reduced photocatalytic activity, and simple equipment

Active Publication Date: 2013-12-11
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the photocatalytic activity of ZnO QDs was not considered in this study, and the coating system was solvent-based
Coating of ZnO QDs by amphiphilic polymers and surfactants (N. R. Jana, et al, Chem. Commun., 2007, 1406; H. M. Xiong, et al, J. Am. Chem. Soc., 2008, 130, 7522; X. Tang, et al, Langmuir, 2009, 25, 5271.), can improve the water solubility of ZnO QDs, but Due to the photocatalytic activity of ZnO QDs, these amphiphilic polymers and surfactants are easily decomposed under the irradiation of ultraviolet light, resulting in the instability of ZnO QDs, which cannot be used in waterborne UV shielding coatings with high weather resistance and high transparency. preparation

Method used

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  • Preparation method of water-based ultraviolet barrier coating based on ZnO quantum dots
  • Preparation method of water-based ultraviolet barrier coating based on ZnO quantum dots
  • Preparation method of water-based ultraviolet barrier coating based on ZnO quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Add 1 mmol LiOH . h 2 O was added to 50 mL of ethanol and sonicated for 30 min to fully dissolve it. Add 0.25 mmol Zn(Ac) 2 .2H 2O, sonicate for 5 min to obtain a clear and transparent solution. Then, the transparent solution was heated to 70 °C and stirred for 3 h to obtain the ZnO QDs dispersion. 120 μL tetraethyl orthosilicate and 400 μL distilled water were sequentially added to the dispersion, immediately ultrasonically oscillated for 20 min, and then stirred at room temperature for 6 h to obtain ZnO QDsSiO 2 dispersion of nanoparticles. Add 200 mL of n-hexane to the dispersion, centrifuge, wash twice with 15 mL of ethanol, and disperse into water. The aqueous dispersion of the nanoparticles can remain transparent and stable for a long time (see Figure 1a); however, the ZnO QDs in Comparative Example 1 appeared agglomeration and precipitation after being dispersed in water for 10 min (see Figure 1b), indicating that the ZnO QDsSiO 2 Nanoparticles have ex...

Embodiment 2

[0028] 0.4 mmol LiOH . h 2 O was added to 50 mL of ethanol and sonicated for 30 min to fully dissolve it. Add 0.25 mmol Zn(Ac) 2 .2H 2 O, sonicate for 5 min to obtain a clear and transparent solution. Then, the transparent solution was heated to 60 °C and stirred for 10 h to obtain the ZnO QDs dispersion. 120 μL tetraethyl orthosilicate and 300 μL distilled water were sequentially added to the dispersion, immediately ultrasonically oscillated for 20 min, and then stirred at room temperature for 6 h to obtain ZnO QDsSiO 2 dispersion of nanoparticles. Add 200 mL of n-hexane to the dispersion, centrifuge, wash twice with 15 mL of ethanol, and disperse into water. The obtained nanoparticle aqueous dispersion was mixed with 2 g of pure acrylic emulsion and 5 mg of DISPERBYK-346, and ultrasonicated for 20 min to obtain a water-based UV shielding coating. Then it was coated on the surface of quartz glass and dried at 30°C for 48 h to obtain a UV shielding coating. The thickne...

Embodiment 3

[0030] 1 mmol LiOH . h 2 O was added to 50 mL of ethanol and sonicated for 30 min to fully dissolve it. Add 0.25 mmol Zn(Ac) 2 .2H 2 O, sonicate for 5 min to obtain a clear and transparent solution. Then, the transparent solution was heated to 70 °C and stirred for 3 h to obtain a ZnO QDs dispersion. 120 μL tetraethyl orthosilicate and 300 μL distilled water were sequentially added to the dispersion, immediately ultrasonically oscillated for 20 min, and then stirred at room temperature for 6 h to obtain ZnO QDsSiO 2 dispersion of nanoparticles. Add 200 mL of n-hexane to the dispersion, centrifuge, wash twice with 15 mL of ethanol, and disperse into water. The obtained aqueous dispersion of nanoparticles was mixed with 2 g of water-based polyurethane and 5 mg of DISPERBYK-346, and ultrasonicated for 20 min to obtain a water-based UV shielding coating. Then it was coated on the surface of quartz glass and dried at 30°C for 48 h to obtain a UV shielding coating. The coati...

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Abstract

The invention belongs to the field of fine chemicals, and relates to a method for preparing a water-based ultraviolet barrier coating with ZnO quantum dots (QDs). The method comprises the steps that ethanol solutions of zinc salt and lithium hydroxide are subjected to a sol-gel reaction; the ZnO QDs are prepared; ethyl orthosilicate serves as a raw material; the surfaces of the ZnO QDs are coated with a layer of silicon dioxide in situ; ZnO QDs@SiO2 kernel-shell nano particles with the photocatalytic activity inhibited effectively are formed, transferred into water, and composited with water-based film forming resin and a wetting agent; and the water-based ultraviolet barrier coating is formed. The content of ZnO QDs@SiO2 in a dry film is 1-50%, and overall barrier of ultraviolet rays with wavelengths less than 340nm is achieved by adjusting the thickness of the film and the content of ZnO QDs@SiO2. According to the method, the ultraviolet barrier coating is water-based, environment-friendly and non-toxic, is applicable to outdoor bamboo, wood, plastic and the like, and can be used for preparing transparent ultraviolet barrier glass.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a preparation method of a water-based ultraviolet shielding coating based on ZnO quantum dots. Background technique [0002] Transparent UV shielding coatings are widely used in the protection of outdoor easily degradable materials (polymers, wood, bamboo, etc.), the preparation of UV shielding glass, and the UV isolation of indoor light sources. They are generally prepared by adding UV absorbers to varnishes. UV absorbers can generally be divided into two categories, one is organic UV absorbers, mainly including benzophenones, benzotriazoles, salicylates, oxalanilides, etc.; the other is inorganic nano UV absorbers mainly include titanium dioxide nanoparticles, ceria nanoparticles, zinc oxide nanoparticles, etc. Organic UV absorbers have the advantages of large UV absorption coefficient, high shielding efficiency, wide shielding band, and good transparency, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D125/14C09D133/04C09D175/04C09D7/12C09C1/04C09C3/06
Inventor 周树学王小龙武利民
Owner FUDAN UNIV
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