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Preparation method of sea urchin-like double-shell hollow microspheres

A sea urchin-shaped, double-shell technology, applied in the field of nanomaterials, to achieve the effect of good resistance

Active Publication Date: 2018-10-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a single reflective coating or barrier coating has limitations in practical applications

Method used

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  • Preparation method of sea urchin-like double-shell hollow microspheres
  • Preparation method of sea urchin-like double-shell hollow microspheres
  • Preparation method of sea urchin-like double-shell hollow microspheres

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Measure 15mL of polystyrene microsphere emulsion, dilute with 18mL of distilled water and 75mL of isopropanol, adjust the pH to 9.5 with ammonia water, add 1.0g of tetraethyl orthosilicate dropwise with a rubber dropper for about 2min, and place at 40°C , 300r / min mechanical stirring for 5h, the product was centrifuged, washed with isopropanol for 1 to 3 times, and dried in an oven at 50°C for 4h. Obtain polystyrene@silica core-shell microspheres.

[0033] (2) Weigh 0.03g of polystyrene@silica core-shell microspheres, ultrasonically disperse them in 15mL of dehydrated ethanol, then dropwise add the dehydrated ethanol solution of tetrabutyl titanate. / min, reacted at 75°C for 2h, centrifuged the product, and washed 1-3 times with absolute ethanol to obtain polystyrene@silica@titanium dioxide multilayer core-shell microspheres. Wherein, the absolute ethanol solution of tetrabutyl titanate is a solution in which the mass ratio of tetrabutyl titanate to absolute ethano...

Embodiment 2

[0036] (1) Measure 22mL of polystyrene microsphere emulsion, dilute it with 21mL of distilled water and 81mL of isopropanol, adjust the pH to 10.0 with ammonia water, add 1.4g of tetraethyl orthosilicate dropwise with a rubber dropper for about 2min, and place at 50°C , stirred mechanically at 300r / min for 5h, centrifuged the product, washed with isopropanol for 1-3 times, and dried in an oven at 40°C for 4h. Obtain polystyrene@silica core-shell microspheres.

[0037] (2) Weigh 0.09g of polystyrene@silica core-shell microspheres, ultrasonically disperse them in 18mL of dehydrated ethanol, then dropwise add the dehydrated ethanol solution of tetrabutyl titanate. / min, react at 75°C for 3 hours, centrifuge the product, and wash with absolute ethanol for 1 to 3 times to obtain polystyrene@silica@titanium dioxide multilayer core-shell microspheres. Wherein, the absolute ethanol solution of tetrabutyl titanate is a solution in which the mass ratio of tetrabutyl titanate to absolut...

Embodiment 3

[0040] (1) Measure 24mL polystyrene microsphere emulsion, dilute it with 22mL distilled water and 82mL isopropanol, adjust the pH to 10.1 with ammonia water, add 1.8g tetraethyl orthosilicate dropwise for about 3min with a rubber dropper, and place at 60°C , stirred mechanically at 300r / min for 6h, centrifuged the product, washed 1-3 times with isopropanol, and dried in an oven at 60°C for 4h. Obtain polystyrene@silica core-shell microspheres.

[0041] (2) Weigh 0.07g of polystyrene@silica core-shell microspheres, ultrasonically disperse them in 21mL of dehydrated ethanol, then dropwise add tetrabutyl titanate in dehydrated ethanol solution. / min, react at 80°C for 3 hours, centrifuge the product, and wash with absolute ethanol for 1 to 3 times to obtain polystyrene@silica@titanium dioxide multilayer core-shell microspheres. Wherein, the absolute ethanol solution of tetrabutyl titanate is a solution in which the mass ratio of tetrabutyl titanate to absolute ethanol is 1:100. ...

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Abstract

The invention discloses a preparation method of sea urchin-like double-shell hollow microspheres. The preparation method comprises coating the surface of a polystyrene microsphere as a template with silicon dioxide, coating the surface of silicon dioxide with titanium dioxide through a sol-gel method, carrying out surface etching on the outer titanium dioxide based on the double-shell microsphereas a template through a hydrothermal method so that a part of Ti-O bonds on the surface of the microsphere are broken and titanium dioxide nanosheets are formed, and carrying out high-temperature calcination to remove the polystyrene template and to obtain the sea urchin-like double-shell hollow microsphere with an irregular sheet structure on the surface. The sea urchin-like double-shell hollow microsphere has a low heat conductivity coefficient. The outer titanium dioxide contains an anatase phase and a rutile phase. Through use of the sea urchin-like double-shell hollow microspheres in thetraditional coating, the heat conductivity coefficient of the coating is reduced, the light reflectivity is improved and the excellent thermal insulation effect is obtained. The sea urchin-like double-shell hollow microsphere has good absorption and reflection effects on UVA and UVB in the ultraviolet light.

Description

technical field [0001] The invention belongs to the field of nanometer materials, in particular to a method for preparing sea urchin-shaped double-shell hollow microspheres. Background technique [0002] At present, the research on thermal insulation coatings is mainly divided into two aspects: one is to use the reflection of inorganic nano-microsphere fillers to sunlight to prepare reflective coatings; the other is to use fillers such as airgel and hollow glass beads to reflect heat Barrier Action Preparation of barrier coatings. However, a single reflective coating or barrier coating has limitations in practical applications. In order to further improve the practical performance of coatings, thermal insulation materials with multiple mechanisms acting synergistically have become a new research hotspot. [0003] Due to its low thermal conductivity, good physical rigidity, good stability, and stable cavity structure, nano-hollow silica is widely used in many fields such as...

Claims

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Application Information

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IPC IPC(8): B01J13/02
CPCB01J13/02
Inventor 鲍艳郭茹月高敏康巧玲刘超马建中
Owner SHAANXI UNIV OF SCI & TECH
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