DEFOAMER FOR HYDRAULIC COMPOSITION, ADDITIVE FOR HYDRAULIC COMPOSITION AND HYDRAULIC COMPOSITION Russian patent published in 2023 - IPC C04B24/32 C04B28/02 C04B103/50 

FIELD: defoaming of hydraulic compositions.

SUBSTANCE: group of inventions relates to defoaming of hydraulic compositions. Defoamer for hydraulic composition with a temperature immediately after mixing in the range of 3°C inclusive to less than 15°C includes a polyoxyalkylene-based compound represented by the general formula RO-[(EO)n/(AO)m]-H, where EO is an oxyethylene group, AO is an oxyalkylene group, AO is an oxypropylene group of PO, and said compound is selected from a group comprising: a compound in which R is a linear chain alkenyl group having 16-18 carbon atoms, in which 4.1 moles of EO and 25.2 moles of PO are linked by polyaddition under block copolymerization conditions in the order (EO)4.1(PO)25.2; a compound in which R is a linear chain alkenyl group having 16-18 carbon atoms, in which 2.5 moles of EO and 21.3 moles of PO are linked by polyaddition under block copolymerization conditions in the order (PO)7.0(EO)2.5(PO)14.3; a compound in which R is a branched chain alkyl group having 16 carbon atoms, in which 4.7 moles of EO and 32.1 moles of PO are linked by polyaddition under block copolymerization conditions in the order (EO)6,3(PO)24.0; a compound in which R is a branched chain alkyl group having 16 carbon atoms, in which 2.3 moles of EO and 29.6 moles of PO are linked by polyaddition under block copolymerization conditions in the order (PO)9,1(EO)2.3(PO)20.5; a compound in which R is a linear chain alkyl group having 18 carbon atoms, in which 5.3 moles of EO and 39.7 moles of PO are linked by polyaddition under block copolymerization conditions in the order (PO)4,1(EO)5.3(PO)35.6; a compound in which R is a straight chain alkyl group having 22 carbon atoms, in which 7.0 moles of EO and 40.0 moles of PO are linked by polyaddition under block copolymerization conditions in the order (EO)7.0(PO)40.0.

EFFECT: efficiency of defoaming at low temperatures without increasing the amount of defoamer.

5 cl, 7 tbl, 25 ex