A method for improving the infrared shading performance of airgel thermal insulation composite materials

A composite material and airgel technology, which is applied in the field of improving the infrared shading performance of airgel thermal insulation composite materials, can solve the problems of low extinction coefficient and achieve low radiation heat conduction, low solid heat conduction, and low infrared radiation heat conduction.

Active Publication Date: 2011-12-14
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above examples still have the problem that the extinction coefficient of titanium dioxide itself is lower than that of titanium dioxide, so there is still room for further improvement in the infrared shading performance of the composite material.

Method used

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  • A method for improving the infrared shading performance of airgel thermal insulation composite materials
  • A method for improving the infrared shading performance of airgel thermal insulation composite materials
  • A method for improving the infrared shading performance of airgel thermal insulation composite materials

Examples

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Embodiment 1

[0028]According to the molar ratio of raw materials resorcinol: furfural: hexamethylenetetramine: isopropanol = 1:2:0.02:25 to prepare a solution of about 1500mL, stir the mixed solution for 30 minutes, and then vacuum impregnate the density to 0.25g / cm 3 High silica fiber reinforced SiO 2 The airgel composite material is then placed in a 50°C water bath for 1 day, then the temperature of the water bath is raised to 75°C, and the temperature is kept constant for 5 days, and then the obtained resorcinol-furfural alcohol gel is filled with SiO 2 Put the airgel composite material into the autoclave, add petroleum ether at 60~90°C to the autoclave, the added volume is 0.2 times the volume of the autoclave, raise the temperature of the autoclave to 260°C at a heating rate of 3°C / min, and keep it warm. After 0.5 hours, release the supercritical petroleum ether in the autoclave completely within 1 hour at constant temperature, turn off the heating program, and after the autoclave i...

Embodiment 2

[0032] The matrix filled in this embodiment has a density of 0.18g / cm 3 Mullite fiber reinforced Al 2 o 3 -SiO 2 Airgel composite material, the preparation of resorcinol-furfural alcohol solution, impregnation, aging, supercritical drying and other processes are all the same as in Example 1 to obtain organic airgel filled mullite fiber reinforced Al 2 o 3 -SiO 2 Airgel composites. This material is put into cracking furnace, under the flow nitrogen of flow velocity 200 milliliters / minute, be heated up to 800 ℃ with heating rate 5 ℃ / minute, after 0.5 hours of insulation, stop heating, under the protection of flow nitrogen, furnace temperature drops to After room temperature, the samples were taken out to obtain carbon airgel filled mullite fiber reinforced Al 2 o 3 -SiO 2 Airgel composite material, material density 0.24g / cm 3 . The carbon airgel filled with high silica fiber reinforced SiO 2 The thermal conductivity of airgel composites in air, the results are as Fi...

Embodiment 3

[0034] The raw materials used in this example are the same as in Example 2, and the preparation, impregnation, aging, supercritical drying and other processes of the resorcinol-furfural alcohol solution are the same as in Example 1, and the organic airgel-filled mullite fiber is obtained. Reinforced Al 2 o 3 -SiO 2 After airgel composites. This material is put into cracking furnace, under the flow nitrogen of flow rate 200 milliliters / minute, be heated up to 1000 ℃ with heating rate 5 ℃ / minute, after keeping warm for 1 hour, stop heating, under the protection of flow nitrogen, furnace temperature drops to After room temperature, the samples were taken out to obtain carbon airgel filled mullite fiber reinforced Al 2 o 3 -SiO 2 Airgel composite material, material density 0.25g / cm 3 . The carbon airgel filled with high silica fiber reinforced SiO 2 The thermal conductivity of airgel composites in air, the results are as Figure 4 shown.

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Abstract

The invention discloses a method for improving the infrared shading performance of an aerogel heat-insulation composite material. In the method, an oxide aerogel composite material is soaked in a carbon-source precursor alcoholic solution, then a supercritical drying and cracking process is performed to form carbon aerogel in nanoscale holes of oxide aerogel, and the advantages of high specific extinction coefficient of the carbon aerogel is utilized fully. Compared with the prior art, the prepared oxide aerogel composite material filled with carbon aerogel in the invention has the advantagesof low radiation heat transfer coefficient and low solid-state heat transfer coefficient, and is particularly suitable for heat insulation applications at higher temperature (500 DEG C when being used in the air and a limit temperature-resistant temperature when being used in vacuum or inertia atmosphere) in the aerospace and other military fields as well as high-end industrial instrument fields.

Description

technical field [0001] The invention relates to a preparation method of an airgel heat-insulating composite material, in particular to a method for improving the infrared shading performance of the airgel heat-insulation composite material. Background technique [0002] Airgel material is a low-density porous material, and its pore wall and pore size are on the order of nanometers. This special structure makes airgel have super thermal insulation performance. Airgel is considered to be the solid material with the best thermal insulation performance at present. Oxide aerogels (such as silica, alumina, zirconia and their composite oxides) and their composite materials are used as a lightweight thermal insulation material , It has broad application prospects in military, aerospace, chemical industry, metallurgy, energy-saving buildings and other fields. [0003] However, oxide aerogels have strong permeability to near-infrared thermal radiation with a wavelength of 3-8 μm, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02
Inventor 张长瑞冯坚冯军宗姜勇刚
Owner NAT UNIV OF DEFENSE TECH
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