METHODS OF REGENERATING GYPSUM PANELS CONTAINING HYDROPHOBIC MATERIALS AND USE THEREOF Russian patent published in 2024 - IPC C04B28/14 C04B11/00 C04B18/16 C04B24/42 C04B38/10 B32B13/08 E04C2/04 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to methods of making gypsum boards. In the first embodiment, the method involves combining water, a first plurality of particles containing at least 50 wt.% of calcium sulphate dihydrate and 0.05 wt.% to 10 wt.% of hydrophobic material, and a second plurality of particles containing calcium sulphate hemihydrate to obtain an aqueous gypsum suspension. First plurality of particles has a particle size D50 of 200 to 800 mcm. Core layer containing an aqueous suspension of gypsum is applied on a forming surface containing a facing sheet. Core layer is set to form a hardened gypsum core over the facing sheet. In a second embodiment, the method includes combining water, a first plurality of particles containing at least 50 wt.% of calcium sulphate dihydrate and 0.05 wt.% to 10 wt.% of hydrophobic material, wherein at least 98 wt.% of the first plurality of particles have size of 100 to 3000 mcm, and a second plurality of particles containing calcium sulphate hemihydrate, to obtain an aqueous suspension of gypsum.

EFFECT: high efficiency of processing gypsum materials containing hydrophobic components.

10 cl, 4 dwg, 2 tbl