AEROGEL COMPOSITE FOR HEAT INSULATION AND METHOD FOR ITS PRODUCTION Russian patent published in 2023 - IPC C04B38/00 C01B33/14 D04H13/00 

FIELD: insulation.

SUBSTANCE heat-insulating materials using aerogels. A method for producing an aerogel composite for thermal insulation includes diluting a liquid glass solution with its subsequent supply to the ion exchange stage, impregnating a fibrous substrate with the resulting solution, gelling, replacing the solvent, hydrophobization and drying, while the liquid glass solution is diluted by mixing it with water until the mass content of silicon dioxide 2-10% by weight, a solution of a strong base is added to the semi-product obtained after ion exchange and continuously dosed onto a fibrous substrate with a density of 0.001-0.1 g/cm³, consisting of glass and/or basalt fibres with a diameter of 0.1-20 microns, incubated for 10-30 minutes for gelation, the composite material obtained after impregnation and gelation is kept in an aqueous medium, and then the solvent is replaced by countercurrent washing first with alcohol, and then with a non-polar organic solvent, hydrophobized with a solution of chlorosilanes or alkylsilanes, or alkylsiliconates with a concentration of 2-10% by weight, dried at atmospheric pressure and a temperature not exceeding 60°C for 40-120 minutes. The aerogel composite for heat-insulating, obtained by the above method, includes a fibrous substrate with a density of 0.001-0.1 g/cm³, consisting of glass and/or basalt fibres with a diameter of 0.1-20 mcm, and an aerogel placed in the specified fibrous substrate, and the aerogel composite is a porous matrix with a volume ratio of macropores to mesopores ranging from 1:1 to 2:1, with an average mesopore size ranging from 5 to 20 nm, and an average macropore size of at least 50 nm.

EFFECT: simplification of the production process of heat-insulating material based on aerogel with improved heat-insulating properties in a wide temperature range, increased mechanical strength and flexibility.

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