METHOD OF PRODUCING HEAT-INSULATING MATERIAL AND MIXTURE FOR PRODUCTION THEREOF Russian patent published in 2013 - IPC C03C11/00 C03B19/08 

FIELD: chemistry.

SUBSTANCE: invention relates to production of heat-insulating building materials. Amorphous silicic rock, sodium hydroxide and hot water at 80-90°C are mixed in a reactor for 10-15 minutes until formation of sodium hydrosilicate. The obtained liquid is then mixed with expanded pearlite for 10 minutes. The mixture is foamed in the closed volume of a metal mould at temperature of up to 700°C for 0.5-1 hours. The finished articles are annealed at temperature ranging from 700°C to 360°C for 1 hour, followed by cooling on air. The mixture for producing heat-insulating material contains the following components, wt %: expanded pearlite with density of 75-100 kg/m³ - 20; amorphous silicic rock - 28; sodium hydroxide - 12; water - 40.

EFFECT: low temperature and shorter time for foaming the mixture and annealing the articles.

2 cl, 1 tbl