PREGELATINISED STARCH WITH AVERAGE VISCOSITY RANGE, AND PRODUCT, SUSPENSION AND METHODS RELATED TO SPECIFIED STARCH Russian patent published in 2018 - IPC C04B28/14 B32B13/00 C04B40/00 C04B24/38 C04B103/32 C04B111/20 

FIELD: construction.

SUBSTANCE: slab contains: a core of hardened gypsum, located between two covering sheets. The core is derived from a slurry containing a construction gypsum, water and at least one pregelatinized acid-modified starch. The said pregelatinised acid-modified starch has a viscosity of about 20 to about 500 cps. The viscosity is measured when the pregelatinised acid-modified starch is in the conditions according to the VMA method. The pregelatinised acid-modified starch is present in an amount of from about 0.5 to about 3% by weight of the construction gypsum. For suspension requires increased water consumption to maintain fluidity of suspensions at the same level, which would be without pregelatinised acid-modified starch. The increase was less than the increase in water consumption required for the otherwise identical suspension containing starch having viscosity higher than 500 centipoises depending on VMA, instead of pregelatinised acid-modified starch, and plate core has a hardness of at least 11 pounds (5 kg), measured according to ASTM standard with 473-10. The invention is developed in the dependent claims of the invention formula.

EFFECT: improving the operational properties of the slab.

18 cl, 2 dwg, 25 tbl, 15 ex