High heat insulation transparent SiO2 aerogel film material and preparation method thereof

Abstract

The invention discloses a high heat insulation transparent SiO2 aerogel film material and a preparation method thereof, wherein the preparation method is realized by adopting a sol-gel technique to control the technological condition via using acid / alkali two-step catalytic method, and using hexamethyldisilazane (HMDS) to carry out organic hydrophobic modification on the surface of colloidal particles. The film material and the preparation method thereof are characterized in that the compound precursor sol has stable property, moderate viscidity and long gel time; the prepared aerogel heat insulation film not only has high porosity, low density and low hear conducting coefficient, but also has high light transmissivity and low refractive index, therefore, it is not only fits for the request of high head insulation, but also fits for the transparency request, and can be used as high heat insulation transparent layer of the landing glass of high-rise building and car glass; the row material for preparing aerogel heat insulation film is low in cost, and benefits for realizing commercial application.

Description

technical field

[0001] The invention belongs to the field of porous thermal insulation transparent oxide film materials, in particular to a high thermal insulation transparent SiO 2 Airgel film material and its preparation method. Background technique

[0002] SiO 2 Airgel (aergoels) is a kind of highly dispersed solid-state material in which colloidal particles or polymer molecules coalesce into a nanoporous network structure, and the pores are filled with a gaseous dispersion medium. It has a continuous and irregular fractal structure. SiO 2 Nanoporous morphology of airgel films with excellent properties. Due to SiO 2 Airgel nano-scale particles and their pore distribution, the small interconnected three-dimensional network structure constitutes a complex and tortuous heat flow transfer path, and the nanoporous structure has a pore size much smaller than the mean free path of heat-conducting carriers (such as phonons, etc.). Low thermal conductivity, SiO 2 Airgel can...

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