LIGHT GYPSUM FACING SLAB WITH HIGH STARCH CONTENT Russian patent published in 2011 - IPC C04B11/00 E04F13/02 B32B13/08 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of preparing gypsum suspensions, as well as to making articles from said suspensions. The invention discloses gypsum-containing suspensions which contain gypsum plaster, naphthalene sulphonate dispersing agent and pre-gelled starch. The naphthalene sulphonate dispersing agent is present in amount of at least approximately 0.58% of the mass of the gypsum plaster. The pre-gelled starch is present in amount of at least approximately 0.5-10% of the mass of the dry gypsum plaster in the mixture. The suspension can contain other additives, including trimethaphosphate salts, catalysts, binding materials, lint, glass fibre and other known ingredients. The invention also discloses gypsum-containing products made from such suspensions, e.g. gypsum facing slabs, and a method of making gypsum facing slabs. The invention is developed in subclaims.

EFFECT: high strength of strength of the gypsum plate.

22 cl, 6 tbl, 6 ex