ADDITIVE FOR HYDRAULIC COMPOSITION Russian patent published in 2021 - IPC C04B28/02 C04B24/30 C04B40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to an additive for a hydraulic composition and to a mixture for the preparation of an additive for a hydraulic composition. The additive for the hydraulic composition contains a polycondensation product P containing copolymer obtained by polycondensation of a monomer mixture, which contains compounds A – C of the following formulas (A) – (C), and polymer Q based on polycarboxilic acid, which contains a structural link containing amino group and imino group and/or structural link containing amino group, imino group and amido group:

(wherein R₁ is a hydrogen atom, alkyl group or alkenyl group; A₁O is C_2-4 alkylene oxide group; p is a number from 1 to 300, and X is a hydrogen atom, alkyl group or acyl group; R₂ is alkyl group or alkenyl group; A₂O is C_2-4 alkylene oxide group; q is a number from 1 to 300, and Y₁ is complex phosphate ester group, and R₃ is a hydrogen atom, carboxy group, alkyl group, alkenyl group, phenyl group, naphthyl group or heterocycle group, and r is a number from 1 to 100).

EFFECT: additive for the hydraulic composition suppresses the blackening resulting from the presence of colored fine particles, and suppresses the slowing down of setting, the protrusion of water on the concrete surface and the reduction of initial strength, in addition to this, demonstrates an excellent capacity to reduce water demand.

14 cl