FIELD: manufacture of building materials.
SUBSTANCE: invention relates to preparation of building mortars using foaming agent based on animal-origin protein material and can be employed in manufacture of parts needed in construction of buildings from foamed concrete. In a foaming agent preparation method comprising hydrolysis of animal-origin raw material in presence of alkali to form extract, neutralization of extract with a strong acid, salitization of the strong acid and subsequent dehydration, neutralization of extract is followed by cooling and dehydration by way of mixing cooled extract with dispersant taken in weight proportion to extract between 1:20 and 1:100 and drying mixture to achieve moisture content not higher than 5%. It is advantageous to use dispersant with specific surface 350-1000 m2/m3. Such dispersant can be any mineral and/or organic substance showing dispersing and sorption properties: finely ground minerals, e.g. chalk; mineral fibers, e.g. basalt fiber; various silica-containing substances, e.g. microsilica, silica gel, white black, finely ground pane or packaging glass, finely ground clay; alumina-containing substances, e.g. α-corundum; titanium dioxide; zinc dioxide; as well as wood flour, textile dust, finely crushed rubber, and disintegrated woodworking and pulp-and-paper industry wastes, e.g. scope; and mixtures of dispersed substances, including those listed above.
EFFECT: optimized preparation procedure and increased choice of starting materials.
4 cl, 1 tbl, 6 ex
