Preparation method of boehmite

A boehmite and hydrolysis technology, which is applied in the preparation of alumina/hydroxide, chemical instruments and methods, and aluminum compounds, etc., can solve the problem of irregular powder particle morphology, low initial thermal decomposition temperature, primary particle Large particle size and other problems, to achieve the effect of good crystallization performance, good working conditions and small particle size

Pending Publication Date: 2019-02-15
DALIAN JIAOTONG UNIVERSITY
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] At present, the production capacity of ultra-fine aluminum hydroxide in China continues to increase, and the market share continues to increase. However, due to the large particle size of the product, the irregular shape of the powder particles, and the low initial thermal decomposition temperature, it restricts its application in rubber, plastic and thermosetting. Resin, so solve the technical problems in the application of ultra-fine aluminum hydroxide in the flame retardant industry, help to expand the application range of the product, further increase the market share of the product, and meet the different needs of the diversified market

Method used

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  • Preparation method of boehmite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] If 1kg of cubic blocky boehmite powder is prepared, the proportions of the ingredients in the preparation formula are as follows:

[0031] The aluminum hydroxide powder obtained by the direct hydrolysis method of 1 kg of aluminum, 2.5 liters of water, the specific preparation process is as follows:

[0032] In the first step, add 1kg of aluminum hydroxide powder into a 4-liter hydrothermal reaction kettle, add 2.5 liters of water, and stir evenly.

[0033] In the second step, heat the reactor to 140° C., and heat-treat for 12 hours under stirring conditions.

[0034] The third step is to cool down to room temperature naturally under reduced pressure, and filter through a filter cloth to form a filter cake.

[0035] In the fourth step, the filter cake is beaten and spray-dried to obtain aluminum hydroxide powder.

[0036] In the 5th step, the aluminum hydroxide obtained is weighed and packed (see image 3 , Figure 4 ).

Embodiment 2

[0038] If 1kg of flake-shaped aluminum hydroxide powder is prepared, the proportions of ingredients in the preparation formula are as follows:

[0039] The aluminum hydroxide powder obtained by 1kg kind of method, 2.5 liters of Virahol, the specific preparation process is as follows:

[0040] In the first step, add 1 kg of aluminum hydroxide powder into a 4 liter hydrothermal reaction kettle, add 2.5 liters of isopropanol, and stir evenly.

[0041] In the second step, heat the reactor to 140° C., and heat-treat for 12 hours under stirring conditions.

[0042] The third step is to cool down to room temperature naturally under reduced pressure, and filter through a filter cloth to form a filter cake.

[0043] In the fourth step, the filter cake is beaten and spray-dried to obtain aluminum hydroxide powder.

[0044] In the 5th step, the aluminum hydroxide obtained is weighed and packed (see Figure 5 ).

Embodiment 3

[0046] If 1kg of flake-shaped aluminum hydroxide powder is prepared, the proportions of ingredients in the preparation formula are as follows:

[0047] The aluminum hydroxide powder obtained by 1kg kind of method, 0.5 liters of isopropanol, 2 liters of water, the specific preparation process is as follows:

[0048] In the first step, 1 kg of aluminum hydroxide powder is added to a 4-liter hydrothermal reaction kettle, and 2.5 liters of isopropanol and water mixture are added, and stirred evenly.

[0049] In the second step, heat the reactor to 140° C., and heat-treat for 12 hours under stirring conditions.

[0050] The third step is to cool down to room temperature naturally under reduced pressure, and filter through a filter cloth to form a filter cake.

[0051] In the fourth step, the filter cake is beaten and spray-dried to obtain aluminum hydroxide powder.

[0052] The fifth step is to weigh and pack the obtained aluminum hydroxide.

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Abstract

The invention provides a preparation method of boehmite, and belongs to the technical field of inorganic powder preparation. According to the preparation method, a solvent heat treatment method is adopted, aluminum hydroxide obtained by the direct hydrolysis of aluminum is used as an aluminum source, boehmite powder with different morphologies can be obtained under different solvents and hydrothermal treatment conditions, and aluminium oxide powder with the corresponding morphologies can be obtained by calcination. The boehmite powder obtained by the invention has the characteristics of special morphology, low specific surface area, small and uniform particle size, good dispersion performance and the like. The boehmite powder prepared with the technology can be applied to the fields of flame retardancy, coating, separation, adsorption and the like. Aluminium oxide obtained with the method can be applied to the fields of abrasives and transparent aluminum oxide ceramics.

Description

technical field [0001] The invention relates to the preparation of boehmite, in particular to the preparation of boehmite by direct aluminum hydrolysis, and belongs to the technical field of inorganic powder preparation. Background technique [0002] Domestic research on flame retardant fillers shows that the main problems of aluminum hydroxide flame retardant fillers in my country are coarse particle size, poor thermal stability, and poor compatibility with organic materials. At present, the large-scale production technology of ultra-fine aluminum hydroxide is only mastered by several large aluminum companies in the world. Among them: Alcoa, Japan Showa, Germany Martin, etc. After decades of experience accumulation, these foreign manufacturers have mature technology, advanced technology, small particle size and perfect crystallinity, and the products obtained by using it as filler have excellent processing performance. These have created favorable conditions for them to o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/42
CPCC01F7/02C01F7/428C01P2002/72C01P2004/03C01P2004/04
Inventor 王晶
Owner DALIAN JIAOTONG UNIVERSITY
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