Aerogel composite heat insulation plate and preparation method thereof

Abstract

The invention provides an aerogel composite heat insulation plate. The aerogel composite heat insulation plate is prepared from the following raw materials in parts by mass: 100 parts of ceramic fiber, 3 to 8 parts of an organic bonding agent, 5 to 15 parts of an inorganic bonding agent, 10 to 30 parts of aerogel powder and 0 to 15 parts of an infrared light shielding agent, wherein the aerogel powder is prepared from 5 weight percent to 15 weight percent of structural water. According to the aerogel composite heat insulation plate provided by the invention, the aerogel containing the partialstructural water is used as a filling material of a ceramic fiber plate and part of micron-pore structure in the ceramic fiber plate is changed into a nano-pore and micron-pore composite structure sothat the convection and conduction heat transfer of the ceramic fiber plate are reduced; the infrared light shielding agent is selectively added and is used as an infrared non-transparent substance inthe ceramic fiber plate, so that the radiation heat transfer of the ceramic fiber plate at high temperature is reduced.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation boards, and in particular relates to an airgel composite thermal insulation board and a preparation method thereof. Background technique [0002] Airgel is the material with the best thermal insulation performance so far, with a porosity as high as 95-99.8%, and a thermal conductivity at room temperature as low as 0.007-0.013W / (m K), which is only 1 / 3-1 of the thermal conductivity of ceramic fiber products. / 10. Although airgel has extremely low thermal conductivity, it is very brittle and has poor strength, so it cannot be used alone. It is usually used in airgel composite materials made of glass fiber and rock wool. At present, the silica airgel composite material is the most developed and applied, but the use temperature is generally below 650 °C. Airgel composite materials mainly include airgel felt, board, paper and so on. Ceramic fiber board has excellent high temperature resis...

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Problems solved by technology

[0004] The above-mentioned prior art provides a method for preparing airgel composite thermal insulation products, which is practicable, but also has certain defects: first, there are many production processes, the process is very complicated, and the production cost of the product remains high, which is not conducive to the realization of Industrialized mass production; second, the reinforcing fibers used are generally glass fibers, so that the prepared airgel composite insulation products can only be used in the temperature range below 650 ° C, and can be gas-condensed in industrial furnaces with long-term working temperatures above 800 ° C Adhesive composite thermal insulation products are rarely used, which is not conducive to the realization of energy conservation and emission reduction goals in my country's high temperature industry

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