FIELD: chemistry.
SUBSTANCE: present invention relates to disperser for hydraulic composition containing N-methyl diethanolamine and copolymer having links of formula (1), and links of formula (2): 
(1) where R1 denotes a hydrogen atom or a methyl group and M1 denotes a hydrogen atom or an alkali metal ion; 
(2), where R2 denotes a hydrogen atom or a methyl group, AO denotes an alkyleneoxy group containing from 2 to 4 carbon atoms , l is a number from 0 to 2, m equals 0 or 1, n is average number of moles of added AO and ranges from 2 to 300 and R3 denotes a hydrogen atom or an alkyl group with 1-4 carbon atoms, as well as a hydraulic composition with dispersant and to use of a dispersant to improve fluidity. Invention is developed in subclaims of formula of invention.
EFFECT: technical result is higher fluidity and faster hardening of hydraulic composition with said dispersant.
33 cl, 17 ex, 6 tbl
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