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Composite aerogel thermal insulation material as well as preparation method and application thereof

A technology of composite aerogel and thermal insulation material, which is applied in the field of composite aerogel thermal insulation material and its preparation, and can solve the problems of volume shrinkage, skeleton structure destruction, nanopore structure destruction and the like

Active Publication Date: 2021-03-09
南京龙宇光电材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the working temperature exceeds 1000 °C, Al2O3 airgel will undergo α-phase transition, resulting in volume shrinkage and destroying its nanopore structure, making Al2O3 airgel decreases sharply, and Al2O3 Sintering will occur between the particles, resulting in the destruction of the skeleton structure, which will rapidly reduce the thermal insulation performance of Al2O3 airgel

Method used

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  • Composite aerogel thermal insulation material as well as preparation method and application thereof
  • Composite aerogel thermal insulation material as well as preparation method and application thereof
  • Composite aerogel thermal insulation material as well as preparation method and application thereof

Examples

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preparation example Construction

[0045] The invention provides a preparation method of a composite airgel thermal insulation material, comprising the following steps:

[0046] (1) SiO 2 Airgel and Al 2 o 3 The airgel is mixed and then ground to obtain a mixed powder;

[0047] (2) The mixed powder is mixed with water, and the obtained slurry is placed in a mold for thermal curing to obtain a composite airgel heat insulating material.

[0048] In the present invention, the SiO 2 The preparation method of airgel comprises the following steps:

[0049] (1) Mix silica sol, ethanol, water and amide compounds, adjust the pH value of the mixed solution to 5-6, and then perform gelation treatment to obtain SiO 2 alcohol gel;

[0050] (II) the SiO 2 The alcohol gel was soaked in tetraethyl orthosilicate ethanol solution for aging to obtain aged SiO 2 alcohol gel;

[0051] (III) The aged SiO 2 The alcohol gel was soaked in the hydrophobic compound solution and then dried under normal pressure to obtain SiO 2 ...

Embodiment 1

[0082] Add 64mL silica sol (25%), 128mL ethanol, 8mL deionized water (namely silica sol: ethanol: water=32:64:4) in the beaker, add 2mL DCCA, adjust the pH value to 5 with 20wt% sulfuric acid solution , placed in a constant temperature water bath at 65°C for 2 hours to obtain SiO 2 alcohol gel. The resulting SiO 2 Alcohol gel was aged in 50mL ethanol / tetraethyl orthosilicate solution for 12h, then washed with absolute ethanol for 3 times, and the aged SiO 2 Alcohol gel uses n-hexane, isopropanol, trimethylchlorosilane mixed solution (the volume ratio of n-hexane, isopropanol, trimethylchlorosilane in the mixed solution is 10:10:1, trimethylchlorosilane The dosage is 35% of the molar amount of deionized water) soaked for 12h, then the gel after soaking was taken out and dried under normal pressure, the drying temperature was 65°C, and the time was 36h to obtain SiO 2 airgel.

Embodiment 2

[0084] Other conditions were the same as in Example 1, except that the drying temperature under normal pressure was changed to 45° C., and the drying time was changed to 72 hours.

[0085] image 3 Be the obtained SiO of embodiment 1 2 The TEM image of the airgel, where the left side is the TEM image with a scale of 100nm, and the right side is a TEM image with a scale of 50nm; Figure 4 Gained SiO for embodiment 2 2 TEM image of the airgel, Figure 4The left and right are SiO in different aggregation states 2 The TEM image of the airgel, the scale bar is 50nm. according to Figure 3-4 It can be seen that the SiO prepared in Examples 1-2 2 The airgel particles are uniform.

[0086] Figure 5 Gained SiO for embodiment 2 2 The SEM image of the airgel, in which the SEM image with a scale of 1 μm is on the left, and the SEM image with a scale of 300 nm is on the right. according to Figure 5 It can be seen that the SiO prepared by the present invention 2 Airgel Airgel ...

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Abstract

The invention relates to the technical field of thermal insulation materials for aerospace, and provides a composite aerogel thermal insulation material as well as a preparation method and applicationthereof. The preparation method comprises the following steps: mixing SiO2 aerogel and Al2O3 aerogel, grinding, mixing the mixed powder with water, and carrying out thermocuring in a mold to obtain acomposite aerogel thermal insulation material, wherein the SiO2 aerogel and the Al2O3 aerogel are prepared by adopting an improved sol-gel method. By doping the Al2O3 aerogel with the SiO2 aerogel, contact points among Al2O3 aerogel particles are reduced, and surface / body diffusion is inhibited, so that high-temperature sintering and alpha conversion of Al2O3 are inhibited, and the purpose of improving the high-temperature resistance and the heat insulation performance of Al2O3 is achieved. When the composite aerogel thermal insulation material is used for thermal insulation, the external temperature of the thermal insulation material is lower than 200 DEG C under the conditions that the internal temperature is 1200 DEG C and the thickness of the thermal insulation material is 1 cm, and the aviation thermal insulation requirement can be met.

Description

technical field [0001] The invention relates to the technical field of thermal insulation materials for aerospace, in particular to a composite airgel thermal insulation material and its preparation method and application. Background technique [0002] With the rapid development of the aerospace industry, the requirements for thermal insulation materials in aerospace vehicles are getting higher and higher. Due to its high porosity and nano-sized porous structure, airgel has extremely low thermal conductivity and excellent high temperature resistance, which can meet the increasingly demanding needs of the aerospace field. [0003] Among many aerogels, aluminum oxide (Al 2 o 3 ) Airgel has the most outstanding high temperature resistance and heat insulation performance, and can be used as a heat insulation layer for aviation vehicles. However, when the working temperature exceeds 1000 °C, Al 2 o 3 The aerogel undergoes α-phase transition, leading to volume shrinkage and d...

Claims

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Application Information

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IPC IPC(8): C04B30/00C04B38/08C04B14/06C04B14/30C01B33/155C01B33/158C01B33/159C01F7/02
CPCC04B30/00C04B14/064C04B14/303C04B14/302C01B33/155C01B33/1585C01B33/159C01F7/02C01F7/021C04B2201/30C01P2006/12C01P2006/14C01P2006/16C01P2006/21Y02B80/10
Inventor 杨宇翔李杰李勇费兆泉赵怡
Owner 南京龙宇光电材料科技有限公司
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