DOUBLE SALT AS A POWERFUL PRIMARY TENSIDE FOR CALCIUM SULFATE MIXTURES CONTAINING PROCESSED GYPSUM Russian patent published in 2022 - IPC C04B28/14 C04B22/14 C04B24/16 

FIELD: gypsum compositions.

SUBSTANCE: inventions group relates to a gypsum composition, as well as to a product containing a gypsum composition. The method for producing a gypsum board includes creating a foam from a blowing agent that contains at least one double salt of an alpha-sulfonic fatty acid. A composition containing water and gypsum, and optionally containing auxiliaries is prepared. Shear forces are applied to the resulting composition with the addition of foam. Resulting composition is then thermally dried. While the gypsum has a proportion of recycled gypsum of at least 0.5 wt.%, in terms of the total proportion of gypsum in the composition. At the same time, the gypsum board obtained by thermal drying of the composition contains at least 40.0 wt.% of gypsum and at least 0.002 wt.% of the specified foaming agent.

EFFECT: improving the efficiency of foaming composition, increasing the density in the wet state.

10 cl, 5 ex, 1 tbl