SILICON DIOXIDE COLLOIDAL DISPERSION Russian patent published in 2006 - IPC C01B33/18 C01B33/148 

FIELD: inorganic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for preparing the stable, aqueous, silanized colloidal dispersion of silicon dioxide with the content of silicon dioxide at least about 20 wt.-%. Method involves mixing at least one silane compound and silicon dioxide colloidal particles in an aqueous solvent in the mass ratio of silane to silicon dioxide from about 0.003 to about 0.2. Also, invention relates to the stable, aqueous, silanized colloidal silicon dioxide dispersion preparing by this method, and to a stable, aqueous, silanized silicon dioxide colloidal dispersion with the content of silicon dioxide about 20 wt.-% wherein the mass ratio of silane to silicon dioxide is from about 0.003 to about 0.2. Except for, invention relates to using dispersion as a cover and as an additive to concrete material. Invention provides preparing the stable and highly concentrated colloidal dispersion of silicon dioxide, minimizing effects on environment, provides the suitable and inexpensive method for its preparing.

EFFECT: improved preparing method, valuable properties of dispersion.

13 cl, 8 tbl, 1 ex