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Spherical alumina and preparation method and application thereof

A spherical alumina and aluminum source technology, applied in chemical instruments and methods, alumina/aluminum hydroxide, aluminum compounds, etc., can solve the problems of high energy consumption, difficult process control, and small specific surface area of ​​spherical alumina, and achieve Excellent powder fluidity, good powder fluidity and small specific surface area

Active Publication Date: 2020-07-31
LUOYANG ZHONGCHAO NEW MATERIAL SHARES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a spherical alumina and its preparation method and application in order to overcome the problems of high energy consumption, high cost, low output and difficult process control in the preparation of spherical alumina in the prior art. Alumina has the characteristics of small specific surface area and large specific area, and spherical alumina has high density, no obvious holes on the surface, good sphericity and shape, and spherical alumina has excellent powder fluidity. It can be used in special ceramic materials and spherical materials. and other fields have good application prospects, especially, when used as a filler, it can significantly improve the thermal conductivity of composite materials

Method used

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  • Spherical alumina and preparation method and application thereof
  • Spherical alumina and preparation method and application thereof
  • Spherical alumina and preparation method and application thereof

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preparation example Construction

[0018] The second aspect of the present invention provides a method for preparing spherical alumina according to the present invention, wherein the preparation method comprises:

[0019] The aluminum source, binder, dispersant, defoamer, and sintering aid are configured into a mixture slurry, and the mixture slurry is sprayed and granulated to obtain the spherical alumina.

[0020] In the present invention, the raw material mixture containing aluminum source, binder, dispersant, defoamer and sintering aid is prepared into a slurry, and the mixture slurry is sprayed and granulated to obtain spherical alumina. The method has the advantages of simple production process, low cost and large output, and the prepared powder has good fluidity and excellent performance.

[0021] In the present invention, the aluminum source used is a nanoscale aluminum source.

[0022] According to the present invention, the aluminum source is at least one selected from alumina, aluminum hydroxide, gi...

Embodiment 1

[0049] Aluminum hydroxide is selected as the aluminum source, and the powder is added with deionized hydration slurry. Sodium polyacrylate is used as the dispersant. The content of the dispersant is 1.1wt% of the mass of the aforementioned aluminum source. agent (weight-average molecular weight is 7000), the content is 1.3wt% of the aforementioned aluminum source quality, select organic polyether ester defoamer, the content is 0.35wt% of the aforementioned aluminum source quality, select magnesium oxide sintering aid, the content is the aforementioned 1.2wt% of the mass of the aluminum source was added and stirred for 30 minutes while stirring, and the solid content of the aluminum source of the final slurry was 48wt%, and granulation was carried out after stirring evenly.

[0050]The spray granulation method is pressure spray granulation, the inlet temperature is 230°C, the outlet temperature is 110°C, the air pressure is 0.55MPa, and the negative pressure is controlled by mid...

Embodiment 2

[0052] Aluminum hydroxide is selected as the aluminum raw material, and the powder is added with deionized hydration slurry, and polyethyl acrylate is used as the dispersant. The content of the dispersant is 0.8wt% of the mass of the aforementioned aluminum raw material. (PTFE) binder (weight-average molecular weight is 10000), content is 1.2wt% of aforementioned aluminum raw material quality, selects polypropylene glycol defoamer, and content is 0.25wt% of aforementioned aluminum raw material quality, selects calcium oxide sintering aid for use, The content is 1wt% of the mass of the aforementioned aluminum raw material, and it is added and stirred for 30 minutes while stirring. The solid content of the aluminum raw material in the final slurry is 43wt%, and it is granulated after stirring evenly.

[0053] The spray granulation method is pressure spray granulation, the inlet temperature is 250°C, the outlet temperature is 106°C, the air pressure is 0.58MPa, and the negative pr...

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Abstract

The invention relates to the production field of spherical material granulation, and discloses spherical alumina as well as a preparation method and application thereof. The specific gravity of the spherical alumina is 3.85 g / cm<3> to 3.95 g / cm<3>; the specific surface area of the spherical alumina is 0.03 to 0.25 m<2> / g; and the apparent bulk density of the spherical alumina is 2-2.6 g / cm<3>. Thespherical alumina has the characteristics of small specific surface area and large specific gravity; has the advantages of high density, no obvious cavities on the surface, favorable sphericity and favorable form, has excellent powder flowability, has favorable application prospects in the fields of special ceramic materials, spherical materials and the like, and can obviously improve the heat-conducting property of a composite material when being used as a filler. Moreover, the provided preparation method is simple in production process, low in cost and high in yield.

Description

technical field [0001] The invention relates to the production field of spherical material granulation, in particular to a spherical alumina and its preparation method and application. Background technique [0002] With the rapid development of modern chip technology, electric power and communication and other fields, electronic components, intelligent control equipment and related line connections all require special materials, such as spherical materials. Among the spherical materials, spherical alumina is a material in great demand and can be applied in many fields. In the prior art, the main method of spherical heat-conducting alumina is the flame melting method, which requires high equipment, high energy consumption, high cost, and low output, which is not conducive to large-scale application. In addition, the prepared spherical alumina has a bulk density of The improvement is limited, and the specific surface area is relatively large. Contents of the invention [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/44C04B35/10C04B35/626
CPCC01F7/02C01F7/025C01F7/442C01P2004/32C01P2006/10C01P2006/12C01P2006/90C04B35/10C04B35/62695C04B2235/3203C04B2235/3206C04B2235/3208C04B2235/3232C04B2235/3244C04B2235/3281C04B2235/3418
Inventor 张军恒尚兴记裴广斌莫腾腾李顺郭莹莹苗龙强
Owner LUOYANG ZHONGCHAO NEW MATERIAL SHARES CO LTD