FIELD: chemistry.
SUBSTANCE: invention relates to graft copolymers used in building chemicals as additives which reduce water loss. Disclosed is a graft copolymer based on component (a), consisting of an aqueous colloidal-dispersion solution of amorphous silicon dioxide (SiO2) and primarily nanosilicon which has reacted with unsaturated silane and a water-soluble, sulphonic acid-containing polymer component (b), wherein the silane in component (a) is ethylenically unsaturated alkoxy silane with 5-15 carbon atoms and primarily a representative of 3-methacryloxypropyl trialkoxy silane, 3-methacryloxypropyl dialkoxy silane, methacryloxymethyl trialkoxy silane, (methacryloxymethyl)dialkoxy silane, vinyl dialkoxy silane or vinyl trialkoxy silane. Also disclosed is a method of producing said graft copolymer and use thereof.
EFFECT: obtained graft copolymer - nanocomposite - is suitable as an additive for use in building chemicals and when opening, exploiting and integrating underground deposits of oil and natural gas with high salinity and at high temperatures.
13 cl, 3 ex
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