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Nanoparticles of alumina and oxides of elements of main groups I and II of the periodic table, and their preparation

A nanoparticle, main group element technology, applied in the preparation of alumina/hydroxide, nanotechnology for materials and surface science, aluminum compounds, etc., can solve the problems of product contamination, long calcination time, low yield, etc.

Inactive Publication Date: 2008-08-13
CLARIANT FIANCE (BVI) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The known prior art processes have the disadvantage that the yield per unit time is low due to the long calcination times, or that in the case of grinding the product is contaminated and still too coarse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Magnesium chloride was added to a 50% aqueous solution of aluminum chloride hydrate so that the ratio of aluminum oxide to magnesium oxide was 99.5:0.5% after calcination. In addition, 2% crystalline nuclei of a suspension of very fine corundum were added to the solution. After the solution has been homogenized by stirring, it is dried in a rotary evaporator. Crush the solid aluminum chloride hydrate / magnesium chloride mixture in a mortar to form a coarse powder.

[0030] The powder was calcined in a rotary kiln at 1050°C. The contact time in the hot zone is a maximum of 5 min. A white powder with a particle distribution consistent with the feed material was obtained.

[0031] X-ray structural analysis revealed the predominant presence of alpha-alumina. The resulting REM photograph (scanning electron microscope) image shows 10-80 nm crystallites (estimated from the REM photograph), which are present as agglomerates. Residual chlorine levels are only a few ppm.

[...

Embodiment 2

[0034] Calcium chloride was added to a 50% aqueous solution of aluminum chloride hydrate so that the ratio of alumina to calcium oxide was 99.5:0.5% after calcination. In addition, 2% crystalline nuclei of a suspension of very fine corundum were added to the solution. After the solution has been homogenized by stirring, it is dried in a rotary evaporator. Crush the solid aluminum chloride hydrate / calcium chloride mixture in a mortar to form a coarse powder.

[0035] The powder was calcined in a rotary kiln at 1050°C. The contact time in the hot zone is a maximum of 5 min. A white powder with a particle distribution consistent with the feed material was obtained.

[0036] X-ray structural analysis revealed the predominant presence of alpha-alumina.

[0037] The resulting REM photograph (scanning electron microscope) image shows 10-80 nm crystallites (estimated from the REM), which exist as agglomerates. Residual chlorine levels are only a few ppm.

[0038] In a further st...

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Abstract

Nanoparticles are claimed which consist of 50% - 99.99% by weight alumina and 0.01% - 50% by weight metal oxide of elements of main group I and II of the Periodic Table. These nanoparticles are obtained by drying a suspension of aluminium chlorohydrate, oxide formers and, if desired, crystallization nuclei, followed by calcining and comminution of the resultant agglomerates.

Description

technical field [0001] The present invention relates to nanoparticles and their preparation, wherein said nanoparticles are made of Al 2 o 3 Composed of oxides with a certain proportion of elements of the main groups I and II of the periodic table. Background technique [0002] Fine aluminum oxide powders are used in particular in cosmetic applications, for matrix reinforcement of organic or metallic layers, as fillers, as polishing powders, in abrasive production, as additives in coatings and laminates and in other special applications. [0003] The preparation of ultrafine alumina powder is carried out by chemical synthesis, mechanical pulverization or thermophysical way. [0004] The known prior art processes have the disadvantage that the yield per unit time is low due to the long calcination times, or that in the case of grinding the product is contaminated and still too coarse. Contents of the invention [0005] The object of the present invention is therefore to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30C01F7/306
CPCC01F7/306C01P2004/64B82Y30/00C01P2004/62C01P2002/60Y10S977/773
Inventor N·勒施E·克伦德林格尔A·海因策K·蔡斯贝格尔P·克卢格W·希姆舍
Owner CLARIANT FIANCE (BVI) LTD
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