Preparation method of silica aerogel and glass fiber mat composite material

Abstract

The invention discloses a preparation method of a silica aerogel and glass fiber mat composite material. The preparation method comprises the following steps: glass fiber mat is placed in rolls or in a tiled form into an appropriate container; a novel ''two-step catalytic method'' of acid-catalytic hydrolysis and fluorinion catalytic condensation is adopted during sol-gel process of silica aerogel; the prepared sol-gel precursor solution is injected into the well-laid glass fiber mat, air in the glass fiber mat is exhausted, and gaps in the glass fiber mat are filled with the sol-gel precursor solution; the sol-gel precursor solution is gelated in the gaps of the glass fiber mat so as to obtain a glass fiber met-gel composite material, and the gelated glass fiber mat composite material is rolled-up again; and the rolled-up glass fiber mat and silica aerogel composite material is modified in an ethanol solution of hexamethyl-disilazane, and the gel composite material undergoes supercritical fluid drying to obtain the silica aerogel and glass fiber mat composite material.

Description

technical field [0001] The invention belongs to the field of airgel materials, and in particular relates to a preparation method of a silica airgel and glass fiber felt composite material. Background technique [0002] Silica aerogels have high specific surface area (~1000m 2 / g), nanoscale holes (~20nm), low density (0.003~0.15g / cm3) and other special microstructures, all exhibit unique properties in thermal, optical, electrical, acoustic and other aspects. Among them, in terms of heat, the nanoporous structure of airgel can effectively inhibit solid-state heat conduction and gas heat transfer, has excellent thermal insulation properties, and is currently recognized as the solid material with the lowest thermal conductivity (0.01~0.03W / (m · K)). [0003] At the same time, silica airgel also has a high service temperature, and even at a high temperature of 900 ° C, it still has a good porous network structure. Therefore, compared with traditional thermal insulation materi...

AI Technical Summary

Problems solved by technology

In the large-scale industrial production process of silica airgel and glass fiber mat composite materials, the sol-gel process of the composite material is easy to dissolve the surfactant in the glass fiber mat precursor, and the sol-gel process of the composite material The process generally adopts a one-step catalytic system or an acid-base two-step catalytic system. The dissolution of the surfactant will affect the catalytic effect, resulting in local non-gelation of the composite material and affecting the final performance of the composite material.