ADDITIVE FOR IMPROVEMENT OF RHEOLOGICAL PROPERTIES OF INORGANIC BINDING SUBSTANCES Russian patent published in 2019 - IPC C08G8/08 C08G65/331 C08G65/335 C04B24/32 C04B103/40 

FIELD: chemistry.

SUBSTANCE: present invention relates to a polycondensate and a method for production thereof, comprising (I) at least one structural unit

,

where A is an unsubstituted aromatic compound having 5-6 carbon atoms in the aromatic structure, B is oxygen, n is 1, R¹ and R², independently of each other, are identical or different and represent a branched or unbranched C₁-C₁₀-alkyl radical or H, provided that the amount of ethylene glycol links in the side chain ranges from 9 to 41 and that the content of ethylene glycol links is higher than 80 mol%, considering all alkylene glycol links in the side chain of polyether, and are identical or different and represent integer from 9 to 50, X is a branched or unbranched C₁-C₁₀-alkyl radical or H, (II) at least one structural unit

,

where D is an unsubstituted aromatic compound having 5-6 carbon atoms in the aromatic structure, E is oxygen, m is 1, R³ and R⁴, independently of each other, are identical or different and represent a branched or unbranched C₁-C₁₀-alkyl radical or H, b are identical or different and represent integer from 1 to 5, M is H or NH₄, alkali metal or ½ alkali-earth metal, provided that molar ratio (I) to (II) ranges from 0.3 to 4, (III) at least one methylene link (-CH₂-), which is attached to two aromatic structural units Y, where aromatic structural units Y, independently of each other, are identical or different and are represented by structural unit (I), structural unit (II) or optionally (IV) aromatic structural units of the polycondensate, which differ from structural unit (I) and structural unit (II), and where the degree of polycondensation of the polycondensate containing structural units (I), (II), (III) and optionally (IV) ranges from 10 to 75. Also described is a composition of a dispersant for inorganic binding substances, comprising said polycondensate together with additional dispersants. Described is a mixture of construction material containing said polycondensate. Application of said polycondensate for dispersion of inorganic binding substances is described. Described is use of said polycondensate to reduce plastic viscosity of concrete.

EFFECT: obtaining dispersing substances which provide a satisfactory ability to reduce water requirements, reduce viscosity of the compositions, in particular concrete, and provide good early strength.

35 cl, 10 tbl, 23 ex