Method for preparing fiber base material and silicon dioxide aerogel composite heat insulating sleeve

Abstract

The invention discloses a method for preparing a fiber base material and silicon dioxide aerogel composite heat insulating sleeve, and belongs to the technical field of materials. The method comprises the following steps: preparing wet gel from polyethoxydisiloxanes, water, a solvent and a catalysts serving as raw materials; and pouring the wet gel into a sleeve die in which a fiber base materialis laid evenly in advance, ageing, putting into an autoclave for drying heat treatment, and reducing temperature and releasing pressure to obtain the fiber base material and silicon dioxide aerogel composite heat insulating sleeve. The method has the advantages of reasonable design and simple operation; the obtained composite heat insulating sleeve has the advantages that: 1, the minimum thickness of the wall of the sleeve is only 0.5mm, the pressive strength can reach over 1MPa, and special dimensions or other special products can be manufactured by a similar process; 2, the minimum density can reach 100kg / m3, and the minimum heat conductivity is only 0.015w / m.k; and 3, the sleeve can resist maximum temperature of 800 DEG C. The sleeve is particularly suitable for the field of aviation with special requirements on heat insulating properties.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a preparation method of a fiber base material and silica airgel composite thermal insulation sleeve. Background technique [0002] Silica airgel is a porous material with high specific surface area and low density. Due to the existence of the nano-network structure, this material itself has special properties, and has broad application prospects in many fields such as optics, electricity, acoustics, environmental protection, metallurgy, etc. Hot science and technology. In view of the excellent material properties and broad application prospects of airgel, many people have carried out research on the preparation of this material. The preparation of silica aerogels generally uses organosilicon as a raw material, and is prepared by a sol-gel process combined with supercritical drying. Under the supercritical conditions of high temperature and high pressure, the liqu...

AI Technical Summary

Problems solved by technology

[0003] Silica nanoporous airgel has a high specific surface area and porosity, and is a light-weight and efficient thermal insulation material, but it is not used much in practice, mainly because the mechanical strength of the airgel is not enough, and it is difficult to form. Therefore, it hinders the widespread use of large areas or large areas

In order to solve this problem, someone tries to compound airgel with other materials (Chinese patent 95197068.2 "a composite material containing airgel, its preparation method and application", 96196879.6 "composite material containing airgel and adhesive, Its Preparation Method and Its Application", 96196880.X "Aerogel Composite Materials Containing Fibers"), but its products are mostly composite plates, for sleeves with small wall thickness but large diameter and height, and some special-shaped Products are difficult to form