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Method for preparing classifying porous aluminum oxide nano heat insulating material

A technology of alumina nanometer and hierarchical porosity, which is applied in the direction of alumina/hydroxide preparation, nanostructure manufacturing, nanotechnology, etc., can solve the problems of nano-alumina impurities, restrictions on widespread promotion, complex process, etc., and achieve low cost , The process is simple and environmentally friendly, and the effect of low thermal expansion coefficient

Inactive Publication Date: 2008-01-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nano-alumina produced by this method has more impurities, which limits its application.
Another example is the name of Chinese patent 200310106128.8: "Preparation method of high-purity nano-alumina fiber powder", which is to soak metal aluminum in the acidic solution of HV-1 catalyst for 1-30 minutes for activation treatment, and then rinse off surface impurities with distilled water , and then blow the metal aluminum for several hours to generate nano-alumina fibers by gas-solid reaction, and collect the fibers to obtain alumina powder. This process is complicated and time-consuming, which limits its wide application.

Method used

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  • Method for preparing classifying porous aluminum oxide nano heat insulating material
  • Method for preparing classifying porous aluminum oxide nano heat insulating material

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Select fresh poultry eggs, remove the liquid content, rinse the eggshells with clean water, soak in 1M hydrochloric acid solution for about 10 minutes to peel off the egg film, rinse thoroughly with clean water and deionized water three times, remove and blow at room temperature Dry in the air; take 2g of the above-mentioned clean and dry biological material egg film that has been treated, add the solution obtained by slowly adding 250g of distilled water to the aluminum chloride solution system (25g of crystalline aluminum chloride under constant stirring, and mix with 1M NaOH Adjust the solution to pH = 4) after soaking for 24 hours, take it out, dry it at 50°C for 2 hours, put it into the induction cooker and heat it to 800°C at a heating rate of 20°C / min and keep it at a constant temperature for 2 hours, then stop heating. Remove after cooling to room temperature. The resulting white flake-like substance is a ceramic material with a hierarchical porous network struc...

Embodiment 2

[0023] Select fresh poultry eggs, remove the liquid content, rinse the eggshell with clean water, put it into 1M hydrochloric acid solution for about 10 minutes to peel off the egg film, rinse it fully with clean water and deionized water three times, remove it and blow it at room temperature. Dry in the air; take 2g of the above-mentioned clean and dry biological material egg film that has been treated, add the solution obtained by slowly adding 250g of distilled water to the aluminum chloride solution system (25g of crystalline aluminum chloride under constant stirring, and mix with 1M NaOH Adjust the solution to pH = 4) after soaking for 24 hours, take it out, dry it at 50°C for 2 hours, put it into the induction cooker and heat it to 1000°C at a heating rate of 25°C / min and keep it at a constant temperature for 1.5 hours. Remove after cooling to room temperature. The resulting white flake-like substance is a ceramic material with egg-film hierarchical porous network struct...

Embodiment 3

[0025] Select fresh poultry eggs, remove the liquid content, rinse the eggshell with clean water, put it into 1M hydrochloric acid solution for about 10 minutes to peel off the egg film, rinse it fully with clean water and deionized water three times, remove it and blow it at room temperature. Dry in the air; take 2g of the above-mentioned clean and dry biological material egg film that has been treated, add the solution obtained by slowly adding 250g of distilled water to the aluminum chloride solution system (25g of crystalline aluminum chloride under constant stirring, and mix with 1M NaOH Adjust the solution to pH = 4) after soaking for 24 hours, take it out, dry it at 50°C for 2 hours, put it into the induction cooker and heat it to 1100°C at a heating rate of 30°C / min and keep it at a constant temperature for 1 hour. Remove after cooling to room temperature. The resulting white flake-like substance is a ceramic material with egg-film hierarchical porous network structure...

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Abstract

This invention relates to the production of classified porous alumina nanometer thermal insulating material, based-on biological templet synthesis technique, by using waste egg shell membrane as raw material. First, the membrane is pretreated by separation and washing, followed by dipping in prodromal liquid aluminium salt solution, then oxidized burnt, forming alumina nanometer material in situ under the effect of biological templet. This invention has advantages of: simple process, low cost, being able to control the granule size and aperture dimension by regulating the burning temperature and speed of stepping-up temperature. The product has advantages of small heat conductivity, low expansion coefficient, well property of anti-heat shock, able to be used in field of metallurgical industry, ceramic furnace as excellent heat insulation refractory.

Description

technical field [0001] The invention relates to a method for preparing a hierarchical porous alumina nano-insulation material, specifically preparing a porous alumina powder with a biofilm hierarchical structure assembled by nanoparticles. The alumina powder exhibits low thermal conductivity and is a An excellent thermal insulation material. It belongs to the technical field of functional materials. Background technique [0002] Alumina (Al 2 o 3 ) is a high-quality thermal insulation refractory material with high strength, high modulus, excellent heat resistance and high temperature oxidation resistance, its thermal conductivity is small, thermal expansion coefficient is low, and thermal shock resistance is good. It can be used as heat insulation material for body lining in sintering furnace or other high temperature furnaces. Nano-alumina basically does not corrode in a physiological environment, has good structural compatibility, has high bonding strength with body ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30C04B38/06C04B35/10B82B3/00
CPCY02P20/10
Inventor 苏慧兰宋钫张荻
Owner SHANGHAI JIAO TONG UNIV
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