Silica aerogel material and preparation method thereof

Abstract

The invention provides a novel silica aerogel material which is diaphanous, adiabatic, heat-retaining and noise-proof and a preparation method of the silica aerogel material. The silica aerogel material has the advantages of being high in tenacity strength, high in transparency, flawless, light in mass, low in density, especially big in block and the like. The silica aerogel material besides can be used in the field of energy saving buildings such as glass curtain walls, doors and windows which are heat-retaining, adiabatic and noise-proof, can be further used in the fields such as aerospace, petroleum and petrochemical, new energy resources, ships and refrigeration, and has good application prospect.

Description

technical field [0001] The invention relates to a silica airgel material and a preparation method thereof, in particular to a low-density, low thermal conductivity, tough, transparent, crack-free bulk silica airgel material and its preparation method. Background technique [0002] Airgel material is a kind of gel material whose dispersion medium is gas. It is a nanoporous solid material with a network structure composed of colloidal particles or polymer molecules. The material has high porosity and light transmission. High efficiency, large specific surface area, small density, low thermal conductivity and other remarkable characteristics, have broad application potential in thermal, acoustic, optical, microelectronics, particle detection and other aspects. [0003] The airgel material with high light transmittance is used in the interlayer of glass windows, which can not only meet the requirements of daylighting and lighting, but also block the heat exchange between indoor...

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Problems solved by technology

[0005] Chinese patent CN200720077474.1 reports a laminated glass filled with SiO 2 The airgel material improves the energy-saving performance of the building. It reduces the brittleness of the airgel and reduces the existence of cracks by filling the airgel material with a large number of inorganic fibers, but greatly affects the light transmittance of the glass; Chinese patent CN200910193595.6 reports A transparent airgel thin film material was prepared by controlling the process conditions using an acid / alkali two-step catalysis method, but no transparent bulk airgel material that can be used for laminated glass has been reported; Chinese patent CN200720077474.1 reported the use of oxide nanowires The method of strengthening the airgel material produces a transparent bulk airgel material, but does not mention the density, thermal conductivity, hydrophobicity, flexibility, strength and other properties of the material and whether it can be used for energy-saving glass; Japan Patent JP09098073 reported the use of hydrofluoric acid to treat the glass surface, and then composite thin layer SiO 2 Airgel material can reduce heat conduction and save energy, but it is not suitable for laminated glass

[0006] In summary, although there are many research reports on improving or improving the performance of silica aerogels in various aspects, there is still a big gap from the requirements of providing airgel materials with good comprehensive performance, that is, it is impossible to obtain one at a time. Transparent, crack-free bulk airgel material with good flexibility and low density

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