Nubby low-density gel heat-insulation composite material

A composite material and low-density technology, applied in the direction of silicon compounds, inorganic chemistry, non-metallic elements, etc., can solve the problems of increased thermal conductivity and increased material density, and achieve the effect of not being prone to cracks

Active Publication Date: 2008-01-02
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have increased the strength of the airgel composite, the density of the material has increased to 0.6g / cm 3 , thermal conductivity increased to 0.04W / (m K)

Method used

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  • Nubby low-density gel heat-insulation composite material
  • Nubby low-density gel heat-insulation composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 400ml of ethanol, 55ml of TEOS, and 12ml of water into a 500ml beaker, stir evenly, add HCl ethanol solution dropwise, adjust the pH to 4, stir vigorously for 6 hours, add 1.0g of PAA with a molecular weight of 15 million, and stir well to a homogeneous phase , add 0.05 mol of HF, stir vigorously for 2-3 minutes, airtight and static aging for 6 days, put the wet gel into the kettle, add 50ml of ethanol, and carry out supercritical drying at 270°C under the constant pressure of 12MPa to obtain large pieces Low density airgel composites.

Embodiment 2

[0027] Fully mix 30 parts by weight of aluminum oxide powder, 60 parts by weight of water glass and 10 parts by weight of sodium fluorosilicate to prepare encapsulation slurry A, and coat the above encapsulation materials on a large low-density 5×2.5mm On the airgel composite material (Example 1), the coating thickness is 0.2mm, and the coating form is shown in Figure 2: put it in an oven at 40°C, cure it for 12 hours, then put it in an oven at 80°C, and dry it for 2 hours to obtain a large Block low-density airgel-encapsulated composites.

[0028] Put the bulk low-density airgel-encapsulated composite into a tube furnace and pass N 2 Gas, raised to 650°C at 1°C / min and calcined for 12 hours, and then cooled naturally to prepare a large low-density, high-temperature heat-insulating airgel-encapsulated composite material.

Embodiment 3

[0030] Fully mix 30 parts by weight of silicon carbide powder, 60 parts by weight of water glass and 10 parts by weight of sodium fluorosilicate to prepare encapsulation slurry B, coat encapsulation slurry A and B according to accompanying drawing 3, and then implement The operation of Example 2, the obtained bulk low-density airgel encapsulation composite material, can obtain the bulk low-density high-temperature heat-insulating airgel encapsulation composite material, the black encapsulation surface of the material is in contact with high temperature, and the white encapsulation surface is in contact with low temperature , can improve the heat insulation effect more effectively.

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Abstract

The invention discloses a low-density aerogel composite material and block-shaped low-density gel insulating composite material through packing the low-density aerogel composite material, which comprises the following steps: utilizing high-polymerization degree polyacrylic acid as porous nanometer silica reinforced frame to make the silica gel and composite material with certain elasticity and contractility; inhibiting crack during gel preparing course and hyper-critical drying course effectively; adopting packing slurry with alumina, titania, carborundum, hollow glass microball or ferroferric oxide and soluble silicate, organosilicon resin or silica gel to pack the surface of large block of silica aerogel; sintering the packed aerogel composite material at 650-700 deg. c; using the material under 1000 deg. c at most.

Description

Technical field: [0001] The invention relates to a low-density airgel composite material and a bulk low-density gel thermal insulation composite material obtained by encapsulating the above-mentioned material. Background technique: [0002] Airgel is a lightweight nanoporous material. Its slender nanoporous network structure enables it to effectively limit solid-state heat conduction and gaseous heat conduction, with a density of 0.01-0.2g / cm 3 , the silica composite aerogel with a porosity up to 95% has excellent thermal insulation performance, especially the large low-density silica airgel material with a certain strength has a particularly low thermal conductivity and can be used as a This light-weight and high-efficiency thermal insulation material has broad application prospects in aerospace, power stations, energy-saving buildings and other fields. [0003] The size of the bulk pure airgel prepared by the sol-gel method should not be too large, otherwise cracks will e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/157C01B33/158
Inventor 沈晓冬江国栋崔升冷艳丽
Owner NANJING UNIV OF TECH
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