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An organic-inorganic double network structure phenolic/alumina airgel composite material and its preparation method

A technology of alumina aerogel and network structure, which is applied in aerogel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problems of poor high temperature stability, phase transition and thermal insulation performance decline of silica aerogel

Active Publication Date: 2021-06-08
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the thermal protection system of aerospace vehicles often faces high temperatures above 1000 °C, silica aerogels have poor high-temperature stability, and are prone to sintering and phase transformation in high-temperature environments, resulting in a sharp decline in thermal insulation performance; at the same time, phenolic hybrid silica composites In airgel, phenolic resin will rapidly carbonize and decompose at higher temperatures, resulting in a decrease in heat resistance and heat insulation performance

Method used

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  • An organic-inorganic double network structure phenolic/alumina airgel composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Mix crystalline aluminum chloride, ethanol, and deionized water at a molar ratio of 1:25:30, stir at 60°C for 30 minutes to form a clear and transparent solution, cool to room temperature, and obtain a solution ;

[0023] (2) Mix resorcinol, formaldehyde, water and sodium carbonate in a molar ratio of 1:1.2:20:380 to obtain a solution ;

[0024] (3) the solution and solution Mix at a volume ratio of 1:1 and stir evenly; add a mixed solution consisting of methanol, acetic acid, and deionized water , stirred evenly, sealed and stood for 120min, the composite sol gradually gelled, and transformed into a phenolic / alumina composite gel; the solution Methanol, acetic acid, deionized water and solutions The molar ratio of aluminum is 6:0.5:0.3:1;

[0025] (4) Aging the phenolic / alumina composite gel in absolute ethanol for 48 hours, and replacing it with fresh absolute ethanol every 12 hours;

[0026] (5) Mix aluminum sec-butoxide, absolute ethanol and deioni...

Embodiment 2

[0031] (1) Mix crystalline aluminum chloride, ethanol, and deionized water at a molar ratio of 1:10:40, stir at 60°C for 50 minutes to form a clear and transparent solution, and add 1.2g of potassium titanate per 100mL of the solution Whiskers, stirred evenly, cooled to room temperature to obtain a solution ;

[0032] (2) Mix resorcinol, formaldehyde, water and sodium carbonate in a molar ratio of 1:0.7:10:260 to obtain a solution ;

[0033] (3) the solution and solution Mix at a volume ratio of 1:1, stir evenly, and add a mixed solution consisting of methanol, acetic acid, and deionized water , stirred evenly, sealed and stood for 120min; the composite sol gradually gelled and transformed into a phenolic / alumina composite gel. the solution Methanol, acetic acid, deionized water and solution The molar ratio of aluminum is 3:0.3:0.1:1;

[0034] (4) Aging the phenolic / alumina composite gel in absolute ethanol for 48 hours, and replacing it with fresh absolute etha...

Embodiment 3

[0040] (1) Mix crystalline aluminum chloride, ethanol, and deionized water at a molar ratio of 1:30:60, stir at 60°C for 60 minutes to form a clear and transparent solution, and cool to room temperature to obtain a solution ;

[0041] (2) Mix resorcinol, formaldehyde, water and sodium carbonate in a molar ratio of 1:2:30:450 to obtain a solution ;

[0042] (3) the solution and solution Mix at a volume ratio of 1:1, stir evenly, add 0.8g of mullite fiber per 100mL solution, and then add a mixed solution composed of methanol, acetic acid, and deionized water , stirred evenly, sealed and stood for 120min; the composite sol gradually gelled and transformed into a phenolic / alumina composite gel. the solution Methanol, acetic acid, deionized water and solution The molar ratio of aluminum is 8:0.2:0.4:1;

[0043] (4) Aging the phenolic / alumina composite gel in absolute ethanol for 48 hours, and replacing it with fresh absolute ethanol every 12 hours;

[0044] (5) Alumi...

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Abstract

The invention discloses a phenolic / alumina airgel composite material with an organic-inorganic double network structure, which is made of resorcinol, formaldehyde and crystalline aluminum chloride as raw materials, and grown into an organic-inorganic double network in situ through hydrolysis and polycondensation reactions Structured composite gel; then use the chemical liquid phase method to deposit aluminum oxide atomic layer on the double network structure composite gel; finally obtain the organic-inorganic double network structure phenolic / alumina airgel composite material through aging and drying. The composite material of the present invention may be added with functionally modified fillers such as inorganic reinforcing fibers and infrared shielding particles to further improve its mechanical properties and heat insulation performance. The obtained composite material has low density, low thermal conductivity, high mechanical strength, low linear The characteristics of the ablation rate are suitable for lightweight anti- / insulation materials for the thermal protection system of aerospace vehicles, and have great application value.

Description

technical field [0001] The invention relates to an organic-inorganic double-network structure phenolic / alumina airgel composite material and a preparation method thereof, which is mainly used as an anti- / heat-insulating material for a thermal protection system of an aerospace vehicle. [0002] technical background [0003] Aerospace vehicles (rockets, missiles, spacecraft, space shuttles) play an important role in consolidating national defense and exploring outer space. The aerodynamic heating generated during the flight will make the local temperature of the aircraft too high, which will damage the structure of the aircraft. Thereby posing a deadly threat to the aircraft. The thermal protection system covers the outer surface of the aircraft and undertakes the role of heat protection and heat insulation to protect the aircraft from burning and high-temperature structural damage. It is one of the key technologies of the spacecraft. [0004] As a super heat insulation materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 杨景锋王齐华王廷梅
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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