A kind of preparation method of nano alumina

A nano-alumina, sodium hydroxide technology, applied in alumina/aluminum hydroxide, nanotechnology, nanotechnology and other directions, can solve the problems of slow progress of nano-alumina powder preparation technology, long preparation period and high price

Inactive Publication Date: 2016-02-10
KAIFENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The existing methods for preparing nano-alumina mostly use expensive aluminum alkoxides and surfactants as raw materials, the process is complicated, the preparation cycle is long, and some require high-temperature and high-pressure hydrothermal reaction conditions. However, there are certain restrictions on the large-scale preparation of nano-alumina powder, resulting in relatively slow progress in the preparation technology of nano-alumina powder, especially in its preparation technology, there are still many technical and engineering problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Measure 100mL of 1mol / L aluminum chloride solution into a beaker, add 1.5mL of acetylacetone solution chelating agent and stir for 10-20min, then slowly add 300mL of 1mol / L sodium hydroxide solution dropwise, stir for 30min until After the reaction is complete, the precipitate is filtered and washed with distilled water, and after drying at a temperature of 100°C, an aluminum hydroxide gel is obtained, and the obtained gel is roasted at a temperature of 1000°C for 3-5 hours, and cooled to room temperature The α-type nano-alumina can be obtained by taking it out and grinding it finely. The result of transmission electron microscopy shows that the particle size of the prepared nano-alumina is 3-15nm.

Embodiment 2

[0022] Measure 100mL1mol / L aluminum nitrate solution into a beaker, add 2mL acetylacetone solution chelating agent and stir for 10-20min, then slowly add 300mL1mol / L sodium hydroxide solution dropwise, stir for 30min until the reaction is complete , filter and wash the precipitate with distilled water, and dry it at a temperature of 100°C to obtain an aluminum hydroxide gel, roast the obtained gel at a temperature of 1000°C for 3-5 hours, cool to room temperature and take it out Grinding finely, α-type nano-alumina can be obtained. The result of transmission electron microscopy shows that the particle size of the prepared nano-alumina is 3-15nm.

Embodiment 3

[0024] Measure 100mL of 1mol / L aluminum chloride solution into a beaker, add 2.5mL of acetylacetone solution chelating agent and stir for 10-20min, then slowly add 300mL of 1mol / L sodium hydroxide solution dropwise, stir for 30min until After the reaction is complete, the precipitate is filtered and washed with distilled water, and after drying at a temperature of 100°C, an aluminum hydroxide gel is obtained, and the obtained gel is roasted at a temperature of 1000°C for 3-5 hours, and cooled to room temperature The α-type nano-alumina can be obtained by taking it out and grinding it finely. The result of transmission electron microscopy shows that the particle size of the prepared nano-alumina is 3-15nm.

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Abstract

A preparing method of nanometer aluminium oxide is provided. The method includes: dissolving an aluminum salt into distilled water, adding a proper amount of a chelating agent, reacting under stirring for 10-20 min to obtain a wine-red transparent solution containing an aluminium ion chelate, adding dropwise and slowly a sodium hydroxide solution with a molar ratio of Al<3+> to OH<-> being 1:3, and reacting under stirring for 30 min until the reaction is finished, washing the precipitate with distilled water, drying the precipitate at 100 DEG C to obtain aluminium hydroxide gel, subjecting the aluminium hydroxide gel to high-temperature processing for 3-5 h, cooling the aluminium hydroxide gel to room temperature, taking out and grinding to obtain the nanometer aluminium oxide having a particle size of 3-15 nm. The method has characteristics of mild preparation conditions, simple process, easy operation, cheap and easily available raw materials and low cost. The prepared aluminum oxide is high in purity and stable in property, and is widely applied.

Description

technical field [0001] The invention relates to a preparation method of nano products, in particular to a preparation method of nano alumina. Background technique [0002] Nano-alumina powder is one of the special functional nano-materials with important application value and development prospect. Nano-alumina has good thermal, optical, electrical, magnetic and chemical properties due to the surface effect, quantum size effect, volume effect, and macroscopic quantum tunneling effect, as well as high chemical activity and high A series of excellent properties such as chemical stability, thermal stability, high hardness and corrosion resistance. It is widely used in artificial gemstones, reagents, catalyst carriers, luminescent materials, electronic ceramic substrates, and aerospace fields. [0003] Since Bugosh first reported the preparation method of nano-alumina in 1961 (BugoshJ.JChemPhys1961;65:1789), people have continuously developed and innovated the preparation metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02B82Y30/00
Inventor 陈永赵辉王丽孙瑞敏
Owner KAIFENG UNIV
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