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US 4,954,327 AGranted
Production of silica aerogels
OwnerDavid H. Blountinventor
Life of this patent
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Abstract
Silica aerogels which exhibit very little shrinkage or partial growth during processing and drying are produced by foaming and reacting a mixture of an oxidated silicon compound, a salt forming compound and a gas in an aqueous medium. The foamed silica gel is then dried to remove water thereby producing silica aerogel. The silica aerogels may be used as a thermal and sound insulator, filler, catalyst, catalyst carrier, reinforcing agent, binder, absorbent, thickening agent and may have other uses.
Claims6
The process for the production of silica aerogels which consists of foaming, mixing and reacting the following components in water:
- (a) oxidated silicon compound selected from the group consisting of alkali metal silicates, alkaline earth metal silicates, silicate minerals, silicic acid sol, aqueous suspension of colloidal silica and mixtures thereof, in the amount of 50 to 100 parts by weight;
- (b) salt forming compound selected from the group consisting of mineral acid, organic acids and mixtures thereof, in the amount of 1 to 10 parts by weight;
- and
- (c) gas selected from the group consisting of air, nitrogen, hydrogen, oxygen, organic gases and mixtures thereof, in the amount of 1 to 10 parts by weight to produce a foamed silica gel, the foamed silica gel is then dried.
1 more element
Dependencies are inferred from the claim text.