Machinable silica aerogel composite rigid thermal insulating tile and preparation method thereof

Abstract

The invention relates to a machinable silica aerogel composite rigid thermal insulating tile and a preparation method thereof. Silica aerogel and a rigid thermal insulating tile are subjected to hydrophobic dry processing after being compounded. The machinable silica aerogel composite rigid thermal insulating tile comprises the ingredient rigid thermal insulating tile, which is the rigid thermal insulating tile of a quartz fiber; the density of the rigid thermal insulating tile is 0.12-0.35g / cm<3>; and the molar ratio of the silica aerogel ingredients, namely the molar ratio of tetraethoxysilane to ethanol to deionized water to catalyst is 1 to (2-10) to (2-12) to (0-0.01). The silica aerogel composite rigid thermal insulating tile prepared by the method is high in porosity and small in aperture, and has a good blocking effect on solid heat transfer, air heat transfer and convection; the preparation method disclosed by the invention is scientific, reasonable, simple, feasible, and convenient to implement; and the prepared self-hydrophobic atmospheric silica aerogel composite rigid thermal insulating tile can be machined into a flat plate, a hood body and other complicated irregular parts.

Description

technical field [0001] The invention relates to a machinable silicon oxide airgel composite rigid heat insulation tile and a preparation method thereof, belonging to the technical field of heat insulation materials. Background technique [0002] With the development of the aerospace industry, the requirements of aircraft for thermal insulation materials are becoming more and more stringent. Thicker and increased weight cannot meet the needs of practical applications. Therefore, the development of airgel thermal insulation composite materials has become the leading direction in the development of high-efficiency thermal insulation materials. Due to its special microstructure such as three-dimensional nanoparticle framework, high specific surface area, nanoscale pores, and low density, airgel can effectively inhibit solid-state heat conduction and gas convective heat transfer, and has excellent thermal insulation properties. It is currently recognized as having the lowest the...

AI Technical Summary

Problems solved by technology

At present, the most effective drying method for preparing airgel is supercritical drying. However, due to problems such as expensive supercritical drying equipment, potential safety hazards, and difficulty in mass production, the preparation of airgel composite rigid insulation tiles under normal pressure has become a A very promising method; due to the high porosity of the rigid insulation tile, it is easy to absorb water during storage. After absorbing water, it will greatly affect the heat insulation and dielectric properties of the insulation tile, and it will also Unfavorable factors such as increasing the weight of thermal insulation tiles, therefore, the preparation of thermal insulation tiles that are stable and non-moisture-absorbing at room temperature is the key technology to solve the field of thermal insulation materials