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Method for improving strength of aerogel composite material

A complex and gelling technology, which is applied in chemical instruments and methods, silicon compounds, silicon dioxide, etc., can solve the problems of excessive gel volume shrinkage, short aging time at room temperature, and easy shrinkage, etc., to avoid small Too many molecules, meet the requirements of mechanical processing, and improve the effect of reaction polymerization degree

Active Publication Date: 2012-06-27
海鹰空天材料研究院(苏州)有限责任公司
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Problems solved by technology

Although the more thorough the aging process, the shrinkage of the gel drying process will be smaller, but if the aging time is too long, the gel will experience excessive volume shrinkage
Therefore, if the aging time at room temperature is short, the effect of thickening the skeleton will not be achieved, and if the aging time is too long, it will easily shrink

Method used

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  • Method for improving strength of aerogel composite material
  • Method for improving strength of aerogel composite material

Examples

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Embodiment approach

[0060] According to some embodiments of the present invention, the method for preparing a fiber composite silica airgel material includes the following steps:

[0061] 1) Silica sol preparation steps;

[0062] 2) Impregnation step: using the silica sol to impregnate the reinforcing fiber to obtain a silica sol-reinforcing fiber composite;

[0063] 3) Gelation step: gelling the silica sol-reinforced fiber composite at room temperature to obtain a silica wet gel-reinforced fiber composite;

[0064] 4) Aging step: using the aging composition described in the first part of the present invention or the aging method described in the second part of the present invention to age the silicon wet gel-reinforced fiber composite;

[0065] 5) Solvent replacement step: replacing the solvent present in the aged silicon wet gel-reinforced fiber composite with a replacement solvent; and

[0066] 6) Drying step: using a supercritical fluid drying method to dry the silicon wet gel-reinforced fi...

Embodiment 1

[0077] Prepare tetraethyl orthosilicate, absolute ethanol, deionized water, and ammonia water at a molar ratio of 1:10:3:0.0002 to form silica sol, then compound with glass fiber used as reinforcing fiber, gel at room temperature, and then place In the aging solution with a molar ratio of ethyl orthosilicate and tetramethylammonium hydroxide of 1:0.0002, heat at 60°C for 24 hours, place at room temperature for 24 hours, then heat at 70°C for 72 hours, and use ethanol for solvent replacement Afterwards, supercritical CO 2 Dry to obtain a silica airgel composite material. After determination, the 2MPa compressive strength of the fiber composite silicon airgel material at room temperature is 5% (according to the method of GJB 1585A-2004), and the density is 0.25g / cm 3 (According to the method of GB / T13350-2000).

[0078] Except for the contents shown in Table 1 and the appended notes of Table 1, other examples and comparative examples were carried out in the same manner as in E...

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Abstract

The invention relates to a method for improving the strength of a silica aerogel composite material, particularly to an ageing composition for ageing silicon wet gel, an ageing method for silicon wet gel and a method for preparing a fibre composite silicon aerogel material by the ageing method. The ageing composition contains silica-alkoxides and a catalyst, especially an alkalescent catalyst. The ageing method may be performed in conditions such as repeated heating. The fibre composite silicon aerogel material prepared by the method disclosed by the invention has the advantages of being good in thermal stability and high in strength of aerogel composite material. Moreover, the method is simple in process, high in safety, as well as low in equipment demand and investment.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to an airgel material and a preparation method thereof. Background technique [0002] Airgel material is the solid material with the best heat insulation performance found so far. It is a network porous material formed by the aggregation of nanoparticles. Its pores are on the order of nanometers and are smaller than the free path of air molecules, which can minimize Gas convective heat transfer; and its nanostructure characteristics lead to low heat conduction, so airgel material has the characteristics of low thermal conductivity and low density, and is a lightweight and efficient heat insulation material. Airgel materials are widely used in the field of aerospace as thermal insulation materials. Both the Russian "Mir" space station and the American "Spirit" Mars rover use it for thermal insulation. In China, the use of new nano-airgel thermal insulation composite mat...

Claims

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Application Information

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IPC IPC(8): C01B33/157C01B33/16
CPCY02P20/54
Inventor 艾素芬张昊邹军锋张鹏李文静张丽娟
Owner 海鹰空天材料研究院(苏州)有限责任公司
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