A composite thermal insulation pad and its manufacturing process

Abstract

The invention belongs to the technical field of heat-resistant materials, and discloses a composite thermal insulation pad and a manufacturing process thereof. Using the ultra-fine basalt fiber needle-punched felt as the raw material, an ultra-thin (1mm thick) ultra-fine basalt fiber aerogel composite thermal insulation pad can be prepared, which can be used in the field of high-temperature thermal insulation materials for power batteries. A product with higher temperature resistance and lower thermal conductivity is prepared and obtained, which not only has better thermal insulation performance, but also has higher insulation performance, longer service life and less environmental hazard. The ultra-fine basalt fiber aerogel composite thermal insulation pad can be used as a thermal insulation material with better performance and can be widely used in metallurgy, machinery, electric power, chemical thermal equipment, aerospace, and military fields. The supercritical method is used to directly dry the aged ultrafine basalt fiber needled felt to obtain a gel-like ultrafine basalt fiber needled felt, which saves the step of replacing the solvent, improves the production efficiency, and shortens the drying time. Reduced production costs.

Description

technical field [0001] The invention belongs to the technical field of heat-resistant materials, and in particular relates to a composite thermal insulation pad and a manufacturing process thereof. Background technique [0002] With the development of inorganic ceramic fiber materials, various SiO 2 , Al 2 O 3 This material does not expand when heated, has good heat insulation, and is resistant to high temperature thermal shock, so it is widely used in industrial installations or high temperature combustion furnaces. hot. In addition, it is also widely used in aerospace thermal protection engineering. However, due to the properties of its material, the theoretical thermal conductivity of the heat resistance coefficient is between 0.045W / (m·K) and 0.210W / (m·K). Due to SiO 2 The low density, irregular pore structure, disordered three-dimensional network morphology, and dense agglomeration of aerogels form density gradients, which lead to SiO 2 The aerogel has serious cr...

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Problems solved by technology

Due to SiO 2 The characteristics of airgel, such as low density, irregular pore structure, disordered three-dimensional network morphology and dense agglomeration to form a density gradient, lead to SiO 2 Airgel cracking is relatively serious and its integrity is poor, which limits the application of pure silica aerogels

In SiO 2 In the field of airgel and fiber composites, fibers such as glass fibers, mullite fibers and quartz fibers are commonly used in the form of chopped fibers or fiber mats with SiO 2 Airgel is composited, and it is difficult to use it in a higher temperature (above 300°C) environment due to the defects of the fiber itself

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