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Preparation method of active nano-aluminium oxide for coating

A nano-alumina, active technology, applied in the field of fine chemicals, can solve the problems of affecting the performance of powder coatings, difficult to prevent particles from coarsening hard agglomerates, high cost, improving thermal stability and specific surface area, eliminating hard Agglomeration phenomenon, the effect of mild production conditions

Inactive Publication Date: 2006-03-29
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the industrial preparation of alumina powder mainly adopts the Bell method and the thermal decomposition of aluminum ammonium alum. This method requires high temperature conditions of 1300-1500 ° C, requires special heating equipment, and the prepared materials are difficult to reach nanoscale
However, traditional wet chemical methods are difficult to effectively control the size and shape of particles, and most importantly, it is usually difficult to prevent the coarsening of particles and the formation of hard aggregates at the high temperature required for alumina transformation
Therefore, it is difficult to prepare real nano-alumina powder by traditional wet chemical method
Once the hard aggregates are formed, it will affect the coating performance of the powder, making it a sharp contradiction with the requirements of high technology
In the post-treatment stage of wet chemical methods, supercritical drying and freeze drying technologies can be used to solve the problem of hard agglomeration of nanoparticles, but such methods have problems such as complex equipment and discontinuous production process.
Using aluminum alkoxide as raw material to prepare nano-alumina particles by sol-gel method has good performance but the cost is too high, so it is only suitable for laboratory preparation and use

Method used

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preparation example Construction

[0024] The preparation process of the present invention is as follows:

[0025]

[0026]

[0027] The basic steps are: first, weigh aluminum ammonium sulfate and ammonium carbonate and dissolve them in secondary water respectively to make a stock solution; secondly, take the above stock solution and add polyethylene glycol to prepare polyethylene glycol-aluminum ammonium sulfate The mixed solution of the mixed solution of polyethylene glycol-ammonium carbonate; the third is after adjusting the pH value, adding the mixed solution of polyethylene glycol monoaluminum ammonium sulfate in the mixed solution of polyethylene glycol-ammonium carbonate, stirring, Centrifugation, washing, and drying; the fourth is azeotropic distillation and dehydration; the fifth is high-temperature calcination.

[0028] The step of preparing a kind of active nano-alumina powder for coating is as follows:

[0029] 1. Weigh ammonium aluminum sulfate and ammonium carbonate, dissolve them in double...

Embodiment 1

[0039] Embodiment 1: under the magnetic stirring of 1300r / min, the concentration that will contain 10wt% PEG2000 is the NH of 0.44mol / L 4 Al(SO 4 ) 2 The solution is added with the concentration of 0.80mol / L (NH 4 ) 2 CO 3 In the solution (pH 9.3), after the titration is completed, continue to stir for 0.5 h; centrifuge, wash 4 times with secondary water and 3 times with ethanol, dry at 80°C for 4 h, remove surface water, and obtain a dry powder. Add the obtained dry powder into 80ml of n-butanol, after ultrasonic dispersion, reflux for 2h, distill and remove the n-butanol-water azeotrope at 93°C, when the fraction temperature rises to the boiling point of n-butanol at 117°C, After stopping the distillation and continuing to reflux for 2 h, the n-butanol was recovered by distillation under reduced pressure to obtain a loose powder.

[0040] Calcined at 900°C to obtain γ-Al 2 o 3 product, its particle morphology see figure 1 , good particle size and shape uniformity, go...

Embodiment 2

[0041] Embodiment 2: Under the magnetic stirring of 1300r / min, the NH containing 2wt% PEG2000 concentration is 0.44mol / L 4 Al(SO 4 ) 2 The solution is added into an equal volume of (NH 4 ) 2 CO 3 In the solution (pH 9.3), after the titration is completed, continue to stir for 0.5 h; centrifuge, wash 4 times with secondary water and 3 times with ethanol, dry at 80°C for 4 h, remove surface water, and obtain a dry powder. Add the obtained dry powder into 80ml of n-butanol, after ultrasonic dispersion, reflux for 2h, distill and remove the n-butanol-water azeotrope at 93°C, when the fraction temperature rises to the boiling point of n-butanol at 117°C, After stopping the distillation and continuing to reflux for 2 h, the n-butanol was recovered by distillation under reduced pressure to obtain a loose powder.

[0042] Calcined at 900°C to obtain γ-Al 2 o 3 product, its particle morphology see image 3 , the uniformity of particle size and shape is good, there is some hard ...

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Abstract

A process for preparing the active aluminium oxide nanoparticles used for coating includes such steps as proportionally and respectively dissolving ammonium aluminium sulfate and ammonium carbonate in secondary water, respectively adding them to polyethanediol to obtain two kinds of solution, regulating pH, mixing them together, stirring, centrifugal separation, washing, drying, dewatering by azeotropic distilling and high-temp calcining.

Description

technical field [0001] The invention relates to the field of fine chemical industry, and more specifically relates to a method for preparing active nano-alumina for coating. This method can be used to prepare nano-alumina powder with an average particle diameter of 9-15nm and a relatively high specific surface area. Background technique [0002] Nano-alumina (Al 2 o 3 ) refers to alumina products with a particle size of less than 100 nanometers, which have a series of excellent properties such as high chemical stability, thermal stability, high hardness and corrosion resistance, and are widely used in surface protection materials, catalysts and carriers, and audio tape additives , luminescent materials, electronic ceramic substrates, and aerospace, weapons, high-strength wear-resistant, corrosion-resistant materials and other high-tech cutting-edge industries. Due to nano-Al 2 o 3 It has high purity, fine and uniform particles and good dispersion, and is easy to mix eve...

Claims

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Application Information

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IPC IPC(8): C01F7/30
Inventor 秦健彭天右楚延锋
Owner WUHAN UNIV
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