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Method for preparing nano crystal boehmite

A technology of nanocrystals and boehmite, which is applied in the direction of nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of irregular powder shape, uneven particle size distribution, poor crystallinity of products, etc., and achieve uniform particle size , Regular crystal form, good dispersion effect

Inactive Publication Date: 2009-12-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The product obtained in the process of preparing boehmite by traditional organic alkoxide hydrolysis is usually low-crystalline or even amorphous pseudo-boehmite, but the product has poor crystallinity, easy agglomeration, irregular powder shape and particle size distribution. Uneven etc.

Method used

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  • Method for preparing nano crystal boehmite
  • Method for preparing nano crystal boehmite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Hydrolysis reaction: 10g of aluminum isopropoxide, 80ml of distilled water, react at 70°C for 1h, filter, and dry at 90°C for 12h to obtain hydrated alumina.

[0025] (2) Hydrothermal reaction: Take 5 g of hydrated alumina prepared in step (1), 60 ml of distilled water, put them into a reaction kettle with a polytetrafluoroethylene lining, the filling degree of the reaction kettle is 60%, react at 150 ° C for 4 hours, filter and dry nanocrystalline boehmite.

[0026] (3) Dispersion: Take 1 g of nanocrystalline boehmite prepared in step (1), 100 ml of distilled water, disperse for one hour with a high-speed dispersion homogenizer, add dilute nitric acid until the pH value of the sol is 3-4, and obtain a homogeneous and stable sol .

[0027] Nanoparticles have small particle size, high surface energy, and a tendency to spontaneously agglomerate, and the existence of agglomeration will greatly affect the advantages of nanopowders. Therefore, the dispersion and stabili...

Embodiment 2

[0031] Others of this embodiment are the same as in Example 1, and the addition of distilled water is changed so that the mol ratio of water and aluminum isopropoxide is 50: 1; the hydrothermal reaction time of step (2) is extended to 12h, and nanocrystal boehmite is also produced .

Embodiment 3

[0033] (1) Hydrolysis reaction: 10g of aluminum isopropoxide, 80ml of distilled water, react at 70°C for 1h, filter, and dry at 90°C for 12h.

[0034] (2) Hydrothermal reaction: 5 g of hydrated alumina, 60 ml of distilled water, 60% filling degree of the reaction kettle, react at 200° C. for 4 h, filter and dry to obtain nanocrystalline boehmite.

[0035] (3) Dispersion: Boehmite 1g, distilled water 100ml, disperse in a high-speed dispersing homogenizer for one hour, add dilute nitric acid until the pH of the sol is 3-4.

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Abstract

The invention discloses a preparation method of nano-crystal boehmite, which comprises the following steps: (1) hydrolysis reaction: mixing distilled water and aluminum isopropoxide in a molar ratio of 50-150:1, heating to 70-90 ℃, react for 1~2h, filter the reaction product, and dry in an oven at 80-90℃ for 8-12h; (2) hydrothermal reaction, put the dried product in step (1) into a high-pressure reactor, and use distilled water as the reaction medium , the filling degree of the reactor is 60%-80%, the reaction temperature is 150-200°C, the reaction time is 4-12h, and the nano-crystal boehmite is obtained. The nano crystal boehmite product prepared by the invention has high crystallinity, regular crystal form, uniform particle size, simple dispersion condition and good dispersibility. And it has good water dispersibility, its dispersion condition is simple, the particle size distribution is uniform, and there is no obvious agglomeration phenomenon.

Description

technical field [0001] The invention relates to a method for preparing boehmite, in particular to a method for preparing nano-crystal boehmite by hydrolyzing aluminum alcoholate and then undergoing hydrothermal treatment. Background technique [0002] Pseudo-boehmite and boehmite are the best way to prepare γ-Al 2 o 3 and α-Al 2 o 3 Two important precursors of isocrystalline alumina, γ-Al 2 o 3 It is widely used as catalyst carrier, catalyst and adsorbent, etc.; the α-Al of the final stable product is calcined 2 o 3 It is widely used in the fields of ceramics, electronic circuit substrate materials and structural materials. In addition to being a precursor of alumina, boehmite is widely used in various fields such as catalysts and carriers, inorganic flame retardants, paper-making fillers, and chemical raw materials due to its own characteristics in terms of crystal structure and crystal morphology. [0003] At present, the methods for preparing boehmite mainly inclu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02B82B3/00
Inventor 江琦成继业
Owner SOUTH CHINA UNIV OF TECH
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