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Method for preparing hollow microsphere taking silicon dioxide as inner shell layer and titanium dioxide as outer shell layer

A technology of silicon dioxide and titanium dioxide, which is applied in the field of hollow microsphere preparation, can solve rare problems and achieve the effects of simple operation, high repeatability and broad application prospects

Inactive Publication Date: 2015-07-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above that most of the current research on hollow structure materials focuses on the hollow structure of a single shell, that is, the shell is only one kind of material, such as silicon dioxide, or titanium dioxide, etc., and the two materials are used together as the shell. There are few studies

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  • Method for preparing hollow microsphere taking silicon dioxide as inner shell layer and titanium dioxide as outer shell layer
  • Method for preparing hollow microsphere taking silicon dioxide as inner shell layer and titanium dioxide as outer shell layer

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preparation example Construction

[0017] The method for preparing hollow microspheres with silicon dioxide as the inner shell layer and titanium dioxide as the outer shell layer involved in the present invention comprises the following steps:

[0018] (1) Dilute 2 to 3 mL of polystyrene microsphere emulsion with a solid content of 5 to 10% with 10 to 12 mL of distilled water and 40 to 42 mL of isopropanol, adjust the pH to 9.8 to 10.3, and add dropwise 0.2 to 0.3 g tetraethyl orthosilicate, mechanically stir at 40-50°C, 300-400r / min for 5-8h, centrifuge the product and wash it with isopropanol for 3-5 times, dry it in an oven at 50-70°C for 4-6h, Obtain polystyrene / silica core-shell particles;

[0019] (2) Weigh 0.03-0.05g of polystyrene / silica core-shell particles, ultrasonically disperse them in 15-17mL of absolute ethanol, then add dropwise the absolute ethanol solution of tetrabutyl titanate, the absolute ethanol The sum of the amount and the amount of absolute ethanol in the absolute ethanol solution of ...

Embodiment 1

[0024] (1) Dilute 2mL of polystyrene microsphere emulsion with a solid content of 10% with 10mL of distilled water and 42mL of isopropanol, adjust the pH to 9.8, add dropwise 0.3g of tetraethyl orthosilicate, at 40°C, 400r / min mechanically stirred for 5 hours, the product was centrifuged, washed 5 times with isopropanol, and dried in an oven at 50°C for 6 hours to obtain polystyrene / silica core-shell particles;

[0025] (2) Weigh 0.03g of polystyrene / silica core-shell particles, ultrasonically disperse them in 17mL of absolute ethanol, and then add dropwise the absolute ethanol solution of tetrabutyl titanate, the amount of absolute ethanol is the same as that of titanic acid The sum of the amount of absolute ethanol used in the absolute ethanol solution of tetrabutyl titanate is 24mL; the absolute ethanol solution of tetrabutyl titanate is obtained by dispersing 0.12g of tetrabutyl titanate in 9mL of absolute ethanol, and the dropping time 5min; after the dropwise addition, ...

Embodiment 2

[0030] (1) Dilute 2mL of polystyrene microsphere emulsion with a solid content of 7% with 11mL of distilled water and 41mL of isopropanol, adjust the pH to 10, add 0.2g of tetraethyl orthosilicate dropwise, at 45°C, 350r / min mechanically stirred for 6h, centrifuged the product, washed 4 times with isopropanol, and dried in an oven at 60°C for 5h to obtain polystyrene / silica core-shell particles;

[0031] (2) Weigh 0.04g of polystyrene / silica core-shell particles, ultrasonically disperse them in 16mL of absolute ethanol, then add a solution of tetrabutyl titanate in absolute ethanol dropwise, the amount of absolute ethanol is the same as that of titanic acid The sum of the amount of absolute ethanol in the tetrabutyl titanate absolute ethanol solution is 24mL; the absolute ethanol solution of tetrabutyl titanate is obtained by dispersing 0.15g tetrabutyl titanate in 8mL absolute ethanol, and the dropping time 7min; after the dropwise addition, react at 350r / min, 80°C for 3h, c...

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Abstract

The invention relates to a method for preparing hollow microspheres taking silicon dioxide as an inner shell layer and titanium dioxide as an outer shell layer. At present, the study on hollow structure materials is mostly focused on a hollow structure of a single shell layer, and the study that two materials are adopted as a shell layer together is barely reported. The method comprises the following steps: diluting polystyrene microsphere emulsion with distilled water and isopropanol, dripping tetraethoxysilane, stirring, centrifuging, washing, and drying so as to obtain polystyrene / silicon dioxide core-shell particles; performing ultrasonic dispersion on the polystyrene / silicon dioxide core-shell particles in absolute ethyl alcohol, and at the same time dripping an absolute ethyl alcohol solution of tetrabutyl titanate; enabling the components to react, performing centrifugal washing to obtain polystyrene / silicon dioxide / titanium dioxide multi-core-shell particles, and calcining so as to obtain the hollow microspheres taking silicon dioxide as the inner shell layer and titanium dioxide as the outer shell layer. As a template method and a sol-gel method are combined to prepare the hollow microspheres taking silicon dioxide as the inner shell layer and titanium dioxide as the outer shell layer, the method is simple to operate and high in repeatability.

Description

technical field [0001] The invention relates to a method for preparing hollow microspheres, in particular to a method for preparing hollow microspheres with silicon dioxide as the inner shell and titanium dioxide as the outer shell. Background technique [0002] Hollow structural material is a new type of particulate material developed in the 1950s and 1960s. Because of its special hollow structure, it has a wide range of applications in drug controlled release, lightweight fillers, catalysis and other fields. Silica has the advantages of high stability, high melting point, and large specific surface area, and is widely used in construction, printing and other fields. Titanium dioxide is also widely used due to its unique anti-ultraviolet ability, bactericidal, and photodegradable properties. It is precisely because of the excellent properties of inorganic particles such as silicon dioxide and titanium dioxide that they have also become the focus of attention in the field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02
Inventor 鲍艳李淼马建中
Owner SHAANXI UNIV OF SCI & TECH