METHOD OF PRODUCING HEAT-INSULATING MATERIAL Russian patent published in 2012 - IPC C04B38/10 C04B40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to the construction industry, particularly a method of producing heat-insulating material, which enables to obtain material (article) simultaneously having low coefficient of heat conductivity, environmental and fire safety, wide operating temperature range and high mechanical strength. The method involves preparation of the starting composition of the material by mixing its components, foaming the composition, pouring and solidification thereof in a mould, wherein the composition contains 30-50% liquid sodium glass with silica modulus 2.8-4.5, a hardener based on compounds which release acid into water, a foaming agent, filler and water. Components of the mixture are prepared separately before mixing. The liquid sodium glass is first heated. The long-fibre filler is soaked in water. Foam is prepared from a foaming solution which a 1.5-3.2% aqueous solution of triethanolammonium or a sodium lauryl sulphate. Feeding foam starts during preliminary mixing of liquid glass, filler suspension and hardener, wherein mixing of the foamed composition continues until formation of a homogeneous mixture. A thermally insulated mould is then filled with the foamed composition and then exposed to electromagnetic radiation followed by drying, wherein the composition contains components or mixture thereof in any ratio, with the following content of components in wt %: curable base - 30-50% liquid sodium glass with silica modulus 2.8-4.5 71-77, hardener - either sodium hexafluorosilicate (Na₂SiF₆) or sodium hexafluorotitanate (Na₂TiF₆) or mixture thereof in any ratio of components 8.5-9.1, foaming agent - either triethanolammonium or sodium lauryl sulphate 0.9-3.2, filler - either A5 or A4 or A3 or A2 chrysotile asbestos 2.4-5.5, water - the balance.

EFFECT: improved heat-insulation and high mechanical strength.

6 cl, 2 tbl