Production of aerogel thermal insulation sheet by central injection approach

Abstract

The present invention provides a method for producing aerogel thermal insulation sheet by central injection technique, comprising: (1) mixing and hydrolysis, (2) condensation and dispersion, (3) central injection, (4) drying and solvent recycling; a hydrolyzed aerogel solution is catalyzed by base and rapidly dispersed into a condensation dispersion solution, and then is rapidly injected into the interior of a roll-shaped or multi-layered fabric substrate from the inside out; a gelation is conducted after the fabric substrate is saturated of the condensation dispersion solution before subjected to a drying technique in combination with a solvent recycling technique; the entire process may further involve (5) hot-press and solvent recycling and (6) automated cutting so that the aerogel-fabric composite material stacked with a fabric blanket may be fixed by hot-press, and machined to be an aerogel thermal insulation sheet product with a flat and multi-layered structure.