Preparation method of lamellar gamma-phase nano aluminum oxide

A nano-alumina and flake technology is applied in the field of preparation of flake γ-phase nano-alumina, which can solve the problems of complex process, high reaction temperature and high energy consumption, and achieves simple preparation process, increased specific surface area and high energy consumption. low consumption effect

Inactive Publication Date: 2011-06-29
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention discloses a preparation method of sheet-shaped γ-phase nano-alumina, which aims at overcoming the environmental impact of preparing nano-alumina powder in the prior art, which is complicated in process, high in reaction temperature, long in cycle, high in energy consumption and low in efficiency. Serious pollution and other disadvantages

Method used

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  • Preparation method of lamellar gamma-phase nano aluminum oxide
  • Preparation method of lamellar gamma-phase nano aluminum oxide
  • Preparation method of lamellar gamma-phase nano aluminum oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A. Put 100g of aluminum powder material with a purity greater than 99.5% and a particle size of 95-100um into a rolling vibration mill with a volume of 2.5 liters and a power of 0.12kw for grinding for 2 hours, so that the aluminum powder can be finely processed at the same time form high-energy metastable states, such as figure 1 shown;

[0026] B. Mix the prepared high-energy metastable aluminum powder with tap water in a weight ratio of 1:10, and ultrasonically vibrate for 2 hours in an ultrasonic oscillator with a power of 99 Hz to prepare white milky Al(OH) 3 colloid;

[0027] C. Put the white milky Al(OH) 3 The colloid was directly put into a constant temperature drying oven, and dried at 80°C for 6 hours to obtain Al(OH) 3 powder, whose crystal structure is diffracted as figure 2 shown;

[0028] D. Put the powder into a box-type resistance furnace to dry at 160°C, and dry at a constant temperature for 4 hours to obtain γ-phase sheet-shaped nano-alumina. The...

Embodiment 2

[0030] A. Put 100g of aluminum powder material with a purity greater than 99.5% and a particle size of 95-100um into a rolling vibratory mill with a volume of 2.5 liters and a power of 0.12kw for grinding for 2 hours, so that the aluminum powder can be finely processed at the same time form high-energy metastable states, such as figure 1 shown;

[0031] B. Mix the prepared high-energy metastable aluminum powder with tap water in a weight ratio of 1:10, and ultrasonically vibrate for 2 hours in an ultrasonic oscillator with a power of 99 Hz to prepare white milky Al(OH) 3 colloid;

[0032] C. Put the white milky Al(OH) 3 The colloid was directly put into a constant temperature drying oven, and dried at 80°C for 6 hours to obtain Al(OH) 3 powder, whose crystal structure is diffracted as figure 2 shown;

[0033] D. Put the powder into a box-type resistance furnace to dry at 180°C, and dry at a constant temperature for 4 hours to obtain γ-phase sheet-shaped nano-alumina, who...

Embodiment 3

[0035] A. Put 100g of aluminum powder material with a purity greater than 99.5% and a particle size of 95-100um into the equipment with a volume of 2 figure 1 Shown; 2.5 liters, the power is 0.12kw rolling vibratory mill grinding 2h in the barrel, so that the aluminum powder forms a high-energy metastable state while finely processing,

[0036]B. Mix the prepared high-energy metastable aluminum powder with tap water at a weight ratio of 1:10, and ultrasonically vibrate for 4 hours in an ultrasonic oscillator with a power of 70 Hz to prepare white milky Al(OH) 3 colloid;

[0037] C. Add white milky Al(OH) 3 The colloid was directly put into a constant temperature drying oven, and dried at 80°C for 6 hours to obtain Al(OH) 3 powder, whose crystal structure is diffracted as figure 2 shown;

[0038] D. Put the powder into a box-type resistance furnace to dry at 210°C, and dry at a constant temperature for 4 hours to obtain γ-phase sheet-shaped nano-alumina, whose crystal stru...

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Abstract

The invention relates to a preparation method of lamellar gamma-phase nano aluminum oxide, which comprises the following steps: (1) putting an aluminum powder material, of which the purity is greater than 99.5% and the particle size is 95-100 mu m, into a rolling vibrating mill of which the volume is 2.5 liters and the power is 0.12KW, and milling for 2-3 hours; (2) mixing the aluminum powder prepared in the step (1) and tap water in a weight ratio of 1:10, putting the mixture into an ultrasonic vibrator, and carrying out ultrasonic dispersion for 2-4 hours to prepare a white lacteal Al(OH)3 colloid; (3) putting the white lacteal Al(OH)3 colloid into a constant temperature drying box, and drying at 80 DEG C for 6 hours to obtain Al(OH)3 powder; and (4) finally, putting the Al(OH)3 powder into a box-type resistance furnace, drying at the constant temperature of 160-210 DEG C for 4 hours, and taking out to obtain the lamellar gamma-phase nano Al2O3. The preparation method provided by the invention is implemented at low temperature, is simple, and does not need any additive; and the prepared lamellar gamma-phase nano aluminum oxide has the advantages of low cost, low energy consumption, easy control, no environmental pollution and high repeatability, and is convenient for realizing industrialization.

Description

technical field [0001] The invention relates to a method for preparing flaky gamma-phase nano-alumina, which belongs to the technical field of nano-material and nano-structure preparation. Background technique [0002] γ-phase nano-alumina (γ-Al 2 o 3 ) Compared with micron-sized alumina, it has the advantages of small particle size, large specific surface area, strong adsorption force and high catalytic activity, and is a very versatile nanomaterial. The spheres and honeycombs made of microporous structure can be used as industrial catalysts; they can be used as adsorbents in petroleum refining, petrochemical and automobile exhaust purification; due to γ-Al 2 o 3 Low melting temperature, can be used to manufacture artificial sapphire by hot melting method; add γ-Al to PPE resin 2 o 3 , can effectively increase the melting point of the resin to improve the flame retardancy of the resin; the γ-Al 2 o 3 Added to rubber and resin, its thermal conductivity can be improved...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/42B82Y40/00
Inventor 陈星建王树林
Owner UNIV OF SHANGHAI FOR SCI & TECH
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