Chopped glass fiber silicon dioxide aerogel composite material and preparation method thereof

Abstract

The invention discloses a preparation method of a chopped glass fiber silicon dioxide aerogel composite material and the obtained silicon dioxide aerogel composite material. The method comprises the following steps: mixing a silicon source, a solvent I, an acid catalyst, a chemical drying control additive, a basic catalyst, a solvent II and chopped glass fibers, preserving heat to form composite wet gel, putting the prepared composite wet gel into a reaction kettle, adding an aging solution for aging, and then sealing and preserving heat; adding an exchange solvent for at least two times, and keeping the temperature to enable the wet gel to form aerogel; adding a surface modifier and preserving heat for surface modification; adding an exchange solvent and preserving heat; and drying at normal pressure to obtain the silicon dioxide aerogel composite material. In the preparation process, the consumed solvent is less, the preparation speed is high, and the prepared silicon dioxide aerogel composite material is good in heat insulation property, small in density, high in hydrophobicity and high in mechanical strength.

Description

technical field [0001] The invention relates to the field of thermal insulation materials, in particular to a method for preparing a chopped glass fiber silica airgel composite material and the prepared chopped glass fiber silica airgel composite material. Background technique [0002] Silica airgel is a nanoporous amorphous high-efficiency thermal insulation material whose dispersion medium is gas. It is composed of 95% air and 5% silica skeleton, and its density is 3-500kg / m 3 , the porosity is as high as 80% to 99.8%, and the specific surface area is as high as 1000m 2 / g, the pore size is between 1 and 100nm, and the thermal conductivity can reach 0.015W / (m k) under normal temperature and pressure. Energy petrochemical industry has a very broad application market. [0003] After adding chopped glass fiber and other materials for compounding, the chopped glass fiber can further enhance the mechanical strength of the airgel in the wet gel, further enhance the bending str...

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Problems solved by technology

However, in the production process of airgel, in order to reduce the shrinkage and collapse of the airgel skeleton, it usually takes a long time and solvents, and the long production cycle makes the airgel unable to be continuously produced, which hinders aircondensation. A major obstacle to the industrialization of rubber

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