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Method for preparing monodisperse, non agglomerate Nano zinc oxide with high ultraviolet absorption

A nano-zinc oxide, monodisperse technology, used in nanostructure manufacturing, zinc oxide/zinc hydroxide, nanotechnology, etc., can solve the problems of decreased purity, uneven powder particle size, uneven dispersion, etc., and achieve good crystallinity , good uniformity, low cost effect

Inactive Publication Date: 2007-10-10
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is complex and costly
[0009] (4) Chinese patent CN1556040A has announced a preparation method of nano zinc oxide particles of uniform size. In order to solve the problem that the size of the nanoparticles is not uniform due to the difference in nucleation time and the difficulty in controlling the growth rate, a large amount of zinc oxide particles are used in this test. Bromotoluene, bromophenol and other organic solvents are highly toxic and costly
But the cost is high and the process is complicated
[0013] Most of the above methods are costly and difficult to promote on a large scale; and the shape and particle size of the primary particles of the zinc oxide powder prepared by the existing chemical precipitation method are not uniform, and are easy to agglomerate to form large secondary particles
The zinc oxide powder obtained by agglomeration needs to be crushed or pulverized in advance in practical application. In these processes, it is inevitable that impurities will be mixed in during the processing process, which will reduce the purity and the particle size of the obtained powder is not uniform.
When used in this way, the touch feeling is poor and the dispersion is not uniform
In addition, due to the need for a large amount of crushing energy, the production cost is increased

Method used

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  • Method for preparing monodisperse, non agglomerate Nano zinc oxide with high ultraviolet absorption
  • Method for preparing monodisperse, non agglomerate Nano zinc oxide with high ultraviolet absorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 14.875g of zinc nitrate and 9.6g of ammonium carbonate were respectively dissolved in a mixed solvent composed of 150ml of absolute ethanol and 50ml of deionized water, and stirred evenly. Then adopt the reverse titration method, under vigorous stirring, gradually add the zinc nitrate solution to the ammonium carbonate solution dropwise, after the dropwise addition is completed, gradually raise the temperature to 60°C, and react at a constant temperature of 60°C for 1 hour under high-speed stirring. After cooling to room temperature, the white precipitate was obtained by suction filtration, which was washed 4-5 times with deionized water and absolute ethanol. After suction filtration, the obtained filter cake was dried in a vacuum drying oven at a drying temperature of 60° C. and a drying time of 12 hours. The dried precipitate was calcined in a muffle furnace at a temperature of 300° C. for 2 hours, and finally A monodisperse and non-agglomerated nano-zinc oxide white ...

Embodiment 2

[0033]14.875g of zinc nitrate and 9.6g of ammonium carbonate were respectively dissolved in a mixed solvent composed of 50ml of absolute ethanol and 50ml of deionized water, and stirred evenly. Then adopt the reverse titration method, under vigorous stirring, gradually add the zinc nitrate solution to the ammonium carbonate solution dropwise, after the dropwise addition is completed, gradually raise the temperature to 60°C, and react at a constant temperature of 60°C for 1 hour under high-speed stirring. After cooling to room temperature, the white precipitate was obtained by suction filtration, which was washed 4-5 times with deionized water and absolute ethanol. After suction filtration, the obtained filter cake was dried in a vacuum oven at a drying temperature of 60° C. and a drying time of 10 hours. The dried precipitate was calcined in a muffle furnace at a temperature of 300° C. for 2 hours, and finally A monodisperse and non-agglomerated nano-zinc oxide white powder is...

Embodiment 3

[0038] 16.1 g of anhydrous zinc sulfate and 16.0 g of ammonium bicarbonate were respectively dissolved in a mixed solvent composed of 250 ml of absolute ethanol and 250 ml of deionized water, and stirred evenly. Then use the reverse titration method, under vigorous stirring, add the zinc nitrate solution to the ammonium bicarbonate solution, after the dropwise addition is completed, gradually raise the temperature to 60°C, and react at a constant temperature of 60°C for 1 hour under high-speed stirring. After cooling to room temperature, the white precipitate was obtained by suction filtration, which was washed 4-5 times with deionized water and absolute ethanol. After suction filtration, the obtained filter cake was dried in an electric heating constant temperature blast drying oven, the drying temperature was 60° C., and the drying time was 24 hours. The dried precipitate was calcined in a muffle furnace at 350° C. for 2 hours; finally a monodisperse white nano-zinc oxide po...

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Abstract

This invention relates to a method for preparing monodisperse non-agglomerated nanoscale ZnO with high UV absorbency. The method comprises: dissolving inorganic Zn salt and carbonate precipitant in a mixed solvent of absolute ethanol and deionized water, dropping the Zn salt solution into the precipitant solution under vigorous stirring to obtain precursor basic Zn precipitate, washing, filtering and drying, and calcining at 250-500 deg.C for 0.5-3.0 h to obtain monodisperse non-agglomerated ZnO nanopowder (10-50 nm). The mol. ratio of the inorganic Zn salt to the carbonate precipitant is 1 :( 1-2). The volume ratio of ethanol to water is (0.2-3):1. The ZnO crystals have a hexagonal structure and high UV absorbency.

Description

technical field [0001] The invention relates to a method for preparing monodisperse, non-agglomerated and strongly ultraviolet-absorbing nano-zinc oxide, which belongs to the technical field of inorganic chemistry and chemical engineering and the technical field of nano-metal oxide preparation technology. Background technique [0002] Nano-zinc oxide has high chemical activity due to its small particle size, large specific surface area, and high surface energy. Using nano-zinc oxide instead of ordinary zinc oxide in traditional industrial fields such as ceramics, coatings, and rubber can reduce the use of zinc oxide. Quantity, optimize the production process, greatly improve the performance of the product. For example, in the ceramic industry, nano zinc oxide is used to replace ordinary zinc oxide, which can reduce the sintering of ceramics by 400-600 ° C, effectively reduce energy consumption, and ceramic products have bright appearance, compact texture, excellent performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02B82B3/00
Inventor 施利毅马书蕊冯欣张大为张剑平
Owner SHANGHAI UNIV
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