GYPSUM DISPERSANT Russian patent published in 2018 - IPC C04B24/26 

FIELD: manufacturing technology.

SUBSTANCE: present invention provides a gypsum dispersant, which is used in the manufacture of gypsum boards and other forms. Gypsum dispersant, characterized by comprising (A) a polycarboxylic acid polymer and (B) a polyamide polyamine obtained by a reaction of a polyalkylene polyamine and a dibasic acid as essential components, and/or an alkylene oxide adduct of the polyamide polyamine. Ratio of component (A) and component (B) is (A):(B) = 1:1 to 30:1, as a mass ratio. Polycarboxylic acid polymer (A) includes a structural unit derived from (a) a polyalkylene glycol unsaturated monomer, and a structural unit derived from (b) an unsaturated carboxylic acid monomer. Structural unit derived from (a) polyalkylene glycol unsaturated monomer is presented by General Formula (1):

(1),

where each of R¹, R², R³ and R⁴ is independently a hydrogen atom or a C_1–22 hydrocarbon group, X is -COO-, AO is C_2–4 alkylene oxy group, and n is the number of moles of added alkylene oxy groups and is 1 to 200.

EFFECT: achieved result is an improvement in the fluidity of the gypsum slurry, even if gypsum raw materials used are different in quality and that do not induce delay of curing of gypsum slurry.

1 cl, 8 ex, 3 tbl