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Preparation method for hollow titanium dioxide @ silicon dioxide/water-based polyurethane composite transparent and thermal insulation coating

A water-based polyurethane and titanium dioxide technology, applied in polyurea/polyurethane coatings, titanium oxide/hydroxide, titanium dioxide, etc., can solve problems such as low visible light transmittance, low infrared rejection rate, and poor thermal insulation performance. Achieve the effect of realizing particle size and wall thickness, reducing photocatalytic performance, and improving heat insulation effect

Active Publication Date: 2018-02-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many patents at home and abroad about transparent coatings and thermal insulation coatings, as the coating reported in world patent W00009443 (transparent conductive nano-composite coating and preparation method) has good transparency and conductivity, but thermal insulation performance is not good; world patent W09919267 (Heat-insulating coating) The reported coating has heat-insulating effect, but the transparency is not good; The Chinese patents of 200810023217 (a nano-transparent heat-insulating coating) and 200610036789 (a synthetic polyurethane glass heat-insulating coating and its preparation method) are all based on ATO, ITO, BTO, etc. Thermal insulation powder has different problems such as low visible light transmittance, low infrared rejection rate, or high production cost.

Method used

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  • Preparation method for hollow titanium dioxide @ silicon dioxide/water-based polyurethane composite transparent and thermal insulation coating
  • Preparation method for hollow titanium dioxide @ silicon dioxide/water-based polyurethane composite transparent and thermal insulation coating
  • Preparation method for hollow titanium dioxide @ silicon dioxide/water-based polyurethane composite transparent and thermal insulation coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Add 5g of cationic polystyrene emulsion and 1.19g of ammonia water with a volume concentration of 25% into a three-necked flask containing 80mL of absolute ethanol and mix uniformly to obtain a mixed solution; then 0.5g of tetrabutyl titanate and Add 0.149g of triethanolamine to 1mL of absolute ethanol and mix evenly, and dropwise add it into the mixed solution with a dropper. The dropping time is 1h. After the dropping is completed, react at 50°C for 0.5h, and the product is centrifuged and washed with absolute ethanol. Obtain polystyrene@titanium dioxide particles. Disperse the particles obtained above in 80mL of isopropanol and 5mL of deionized water, adjust the pH to 2.5 with acetic acid, then add 0.1g of tetraethyl orthosilicate, react at 50°C for 2h, and centrifuge the product with isopropanol, 500 ℃ for 5 hours to obtain hollow titania@silica microspheres. Wherein, the particle diameter of the latex particles of the cationic polystyrene emulsion is 20 nm.

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Embodiment 2

[0041](1) 7g of cationic polystyrene emulsion and 2.38g of ammonia water with a volume concentration of 25% are added to a three-necked flask containing 90mL of absolute ethanol and mixed uniformly to obtain a mixed solution; then 0.9g of tetrabutyl titanate and Add 0.218g of triethanolamine to 2mL of absolute ethanol and mix evenly, and add dropwise to the mixed solution with a dropper. The dropping time is 1h. After the dropping is completed, react at 60°C for 1h, and the product is centrifuged and washed with absolute ethanol to obtain Polystyrene@TiO2 particles. Disperse the particles obtained above in 90mL of isopropanol and 8mL of deionized water, adjust the pH to 3.0 with acetic acid, then add 0.15g of tetraethyl orthosilicate, react at 60°C for 3h, and centrifuge the product with isopropanol, 550 ℃ calcination for 4.5h to obtain hollow titania@silica microspheres. Wherein, the particle diameter of the latex particles of the cationic polystyrene emulsion is 150 nm.

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Embodiment 3

[0044] (1) 9g of cationic polystyrene emulsion and 4.76g of ammonia water with a volume concentration of 25% were added to a three-necked flask containing 100mL of absolute ethanol and mixed uniformly to obtain a mixed solution; then 1.2g of tetrabutyl titanate and Add 0.596g of triethanolamine to 3mL of absolute ethanol and mix evenly, and dropwise add it into the mixed solution with a dropper. The dropping time is 1.5h. After the dropping is completed, react at 70°C for 4h, and the product is centrifuged and washed with absolute ethanol. Obtain polystyrene@titanium dioxide particles. Disperse the above obtained product in 100mL isopropanol and 10mL deionized water, adjust the pH to 3.5 with acetic acid, then add 0.2g tetraethyl orthosilicate, react at 70°C for 4h, wash the product with isopropanol by centrifugation, 600°C Calcined for 4 hours to obtain hollow titania@silica microspheres. Wherein, the particle diameter of the latex particles of the cationic polystyrene emuls...

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Abstract

The invention discloses a preparation method for a hollow titanium dioxide @ silicon dioxide / water-based polyurethane composite transparent and thermal insulation coating. Hollow titanium dioxide @ silicon dioxide microspheres are added to a mixed liquid formed by ethanol and water, the mixed materials are dispersed uniformly under ultrasonic, and therefore a hollow titanium dioxide @ silicon dioxide microsphere suspension liquid is obtained; and then the hollow titanium dioxide @ silicon dioxide microsphere suspension liquid is added to water-based polyurethane, stirring is performed uniformly under the temperature of 60-90 DEG C, and therefore the hollow titanium dioxide @ silicon dioxide / water-based polyurethane composite transparent and thermal insulation coating is obtained. Accordingto the invention, the thermal conductivity of the composite transparent and thermal insulation coating prepared by the invention is reduced by 31.24% compared with that of a pure water-based polyurethane coating, the light reflectivity is improved by 487.5%, when the wavelength is 340nm or less the ultraviolet transmittance is zero, the visible light transmittance can be up to 80%, the water resistance is increased by 12.56%, the tensile strength is improved by 35.69%, and the elongation at break is increased by 29.49%.

Description

technical field [0001] The invention belongs to the category of composite transparent heat-insulating coatings, in particular to a method for preparing hollow titanium dioxide@silicon dioxide / water-based polyurethane composite transparent heat-insulating coatings. Background technique [0002] With the improvement of buildings' requirements for outdoor landscape and indoor lighting, glass is used almost without exception in modern buildings, and some high-rise buildings even adopt all-glass exterior wall structures. Ordinary glass, as a good building material, is both beautiful and practical when used as a window, and has excellent permeability to visible light. However, because ordinary glass is not selective to sunlight, it also transmits infrared and ultraviolet rays while it transmits visible light, so the energy dissipation of glass accounting for only 10-15% of the total building area reaches the energy dissipation of the entire building. More than 50% of the loss, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D5/33C01G23/053
CPCC01G23/053C08K7/26C09D5/004C09D175/04
Inventor 鲍艳康巧玲高敏刘超马建中
Owner SHAANXI UNIV OF SCI & TECH
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