Method for rapidly preparing high-aluminum aerogel composite material based on aluminum isopropoxide

A technology of aluminum isopropoxide and composite materials, which is applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of high brittleness, low strength, difficult forming, etc., to improve the reaction rate and efficiency, improve the reaction efficiency, The effect of shortening the production cycle

Active Publication Date: 2020-08-11
响水华夏特材科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, Al 2 o 3 The inherent low strength, high brittleness, and difficulty in forming airgel materials limit the Al 2 o 3 Application of airgel in industry

Method used

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  • Method for rapidly preparing high-aluminum aerogel composite material based on aluminum isopropoxide
  • Method for rapidly preparing high-aluminum aerogel composite material based on aluminum isopropoxide
  • Method for rapidly preparing high-aluminum aerogel composite material based on aluminum isopropoxide

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Preparation of silica sol

[0029] Take ethyl orthosilicate: take 180L ethyl orthosilicate, 45L water, 790L ethanol, adjust the pH to 5.5 with 10% hydrochloric acid solution, stir for 30 minutes, and obtain a silica sol with a concentration of 0.8mol / L, and let it stand for later use .

[0030] (2) Preparation of aluminum sol

[0031] First, after sieving 204kg of aluminum isopropoxide with a 60-mesh sieve, add it to a 2000L jacketed reaction tank filled with 400L of ethanol and 39L of ethyl acetoacetate, stir for 10 minutes, and fully soak and wet it. Open the jacket inlet valve of the jacketed reaction tank, control the inlet temperature of the heating medium to 90°C, and control the outlet temperature to 80°C, add 700L of boiling water to the reaction tank, and continue stirring for about 10 minutes until there is no foam. Then, add 300L ethanol to 300L concentration of 6% nitric acid aqueous solution, after stirring evenly, slowly add in the jacket reaction ta...

Embodiment 2

[0036] Take 10mL of silica sol and 50mL of aluminum sol in Example 1, stir rapidly after mixing for 1min, and obtain a transparent gel after standing for 8min, and obtain a high-alumina aerogel after supercritical drying. figure 2 Shown, test its specific surface area to be 380m2 / g, average pore diameter 11nm, pore volume 1.7cm3 / g, density 0.87g / cm3.

[0037] as in the accompanying drawings image 3 As shown, the airgel obtained in Example 2 has narrower pore size, more uniform pore distribution, and the formed polycrystalline boehmite has a more complete structure and better temperature resistance. It can be widely used in thermal protection in defense industry fields such as high-sonic aircraft and thermal batteries, as well as heat preservation and energy saving in high-temperature industrial fields such as metallurgy and ceramics.

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Abstract

The invention relates to a method for rapidly preparing a high-aluminum aerogel composite material based on aluminum isopropoxide. The high-aluminum aerogel is obtained on the basis of an aluminum isopropoxide rapid hydrolysis process. The content of aluminum oxide in the aerogel is 71.8-87.2%, the heat conductivity coefficient is 0.018-0.021 W / (m.K) at the average temperature of 25 DEG C, the heat conductivity coefficient is less than or equal to 0.055 W / (m.K) at the hot surface temperature of 1000 DEG C, the long-term use temperature is 1000-1200 DEG C, and the preparation period is 6-13 hours. The material can be widely applied to thermal protection in national defense industrial fields such as high-sound-velocity aircrafts and thermal batteries and thermal insulation and energy conservation in high-temperature industrial fields such as metallurgy and ceramics.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, in particular to a method for rapidly preparing high-aluminum airgel composite materials based on aluminum isopropoxide. Background technique [0002] Alumina airgel was first successfully prepared by Professor Yoldas in the United States through metal organoaluminum alkoxides. Alumina can withstand 950°C without sintering, and its linear shrinkage does not exceed 2% after heat treatment at 1050°C for 4 hours. Because of its excellent temperature resistance and thermal insulation properties, it has attracted people's attention, and its preparation methods have been continuously innovated and improved. The aluminum sources for preparing alumina airgel include inorganic aluminum sources represented by aluminum nitrate and aluminum chloride, and organic aluminum sources represented by aluminum isopropoxide and aluminum sec-butoxide. The pore diameter of the glue is narrower, the por...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B38/00
CPCC04B30/02C04B38/0045C04B2201/32C04B14/064C04B14/303C04B14/38
Inventor 陈勇陈世忠段国栋
Owner 响水华夏特材科技发展有限公司
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