Non-hydrolytic sol-gel method for preparing high- dispersity nano alumina

A nano-alumina, high-dispersibility technology, applied in the direction of alumina/aluminum hydroxide, nanotechnology, etc., can solve the problem of less nano-alumina, achieve small particle size, small industrial amplification factor, and uniform particle size distribution Effect

Active Publication Date: 2011-09-14
XUANCHENG JINGRUI NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are very few research reports on nano-alumina with high water dispersibility at home and abroad.

Method used

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  • Non-hydrolytic sol-gel method for preparing high- dispersity nano alumina
  • Non-hydrolytic sol-gel method for preparing high- dispersity nano alumina
  • Non-hydrolytic sol-gel method for preparing high- dispersity nano alumina

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The non-aqueous sol-gel preparation of highly dispersed nano-alumina is prepared by a low-temperature non-aqueous sol-gel method, and the preparation steps are as follows:

[0025] Step 1: Add aluminum salt hexahydrate aluminum trichloride, anhydrous aluminum trichloride, Aluminum nitrate nonahydrate, aluminum sulfate, aluminum ammonium sulfate dodecahydrate or aluminum isopropoxide, prepared as a precursor with an aluminum salt amount of 0.5-1.5 mol / liter;

[0026] Step 2: Solvothermally treat the precursor obtained in Step 1 at a temperature of 100-200° C. for 6-48 hours;

[0027] Step 3: After the reaction in step 2 is completed, wash the sample with absolute ethanol, and dry the product in the air at 50°C for 12 hours to obtain a highly dispersible nano-alumina powder;

Embodiment 2

[0029] The non-aqueous sol-gel preparation of highly dispersed nano-alumina is prepared by a low-temperature non-aqueous sol-gel method, and the preparation steps are as follows:

[0030] Step 1: Add aluminum salt hexahydrate aluminum trichloride, anhydrous aluminum trichloride, Aluminum nitrate nonahydrate, aluminum sulfate, aluminum ammonium sulfate dodecahydrate or aluminum isopropoxide, prepared as a precursor with an aluminum salt amount of 0.5-1.2 mol / liter;

[0031] Step 2: Solvothermally treat the precursor obtained in Step 1 at a temperature of 100-180° C. for 18-36 hours;

[0032] Step 3: After the reaction in step 2 is completed, wash the sample with absolute ethanol, and dry the product in the air at 50°C for 12 hours to obtain a highly dispersible nano-alumina powder;

Embodiment 3

[0034] Preparation of highly dispersible nano-alumina powder, the preparation steps are:

[0035] Step 1: adding anhydrous aluminum trichloride to benzyl alcohol to form a precursor whose amount of anhydrous aluminum trichloride is 0.5 mol / liter;

[0036] Step 2: Solvothermally treat the precursor in step 1 at a temperature of 180°C for 20 hours;

[0037] Step 3: after step 2, centrifuge, and wash the centrifuged product with ethanol for 3 times, and dry the product in air at 50°C for 12 hours to obtain a highly dispersible nano-alumina powder.

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PUM

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Abstract

The invention provides a non-hydrolytic sol-gel method for preparing high-dispersity nano alumina, which comprises the following steps of: preparing a precursor by mixing an aluminum salt with an alcoholic solvent, heat-treating the prepared precursor by using a low-temperature non-aqueous solvent, washing the product with ethanol, centrifuging and then drying to obtain the powder body of the nano alumina with high dispersity. The nano alumina has small particle sizes which are distributed evenly, and can be stably dispersed in water. In the whole producing process, the raw materials are easy to get, the operation is simple, no minute and complicated sample after-treatment processes exist, the reaction yield reaches up to 98%, the industrial amplification factor is small, and thus the industrial production of the high-dispersity nano alumina can be realized.

Description

technical field [0001] The invention relates to a method for preparing a non-aqueous sol gel of nano-alumina with high dispersibility. The nano-alumina obtained by the method has small particle size, uniform particle size distribution, and can be stably dispersed in water. Background technique [0002] Nano-alumina has excellent physical and chemical properties and is widely used in production and life. It is used to make catalysts and carriers, fine ceramics, new coatings, new medical materials, flame retardant materials, rubber anti-aging agents, optical cables, adsorption agent and so on. However, due to the small size of nano-alumina particles, large specific surface area and surface energy, it is easy to agglomerate. When nano-alumina powder can be stably dispersed in a certain medium, especially water, its application value will be greatly improved. , For example, adding nano-alumina sol to the aqueous liquid of acrylic resin, polyurethane resin, epoxy resin and othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B82Y40/00
Inventor 张礼知吴娜徐进徐勇
Owner XUANCHENG JINGRUI NEW MATERIAL CO LTD
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