FIELD: chemical engineering.
SUBSTANCE: present invention relates to method for obtaining special thickening agents and use of thickening agents thus obtained in high viscosity compositions comprising an unsaturated complex polyester. The application describes the use of at least one additive based on a mixed mineral organoclay modifying the rheological characteristics which includes or consists of a mixture of mineral clays processed by quaternary alkylammonium salt obtained by producing an aqueous suspension of chormite clay (a), producing an aqueous suspension of smectite clay (b), combining the aqueous suspension of chormite clay (a) with an aqueous suspension of smectite clay (b) with obtaining a joint suspension of clays (c), processing of a joint suspension of clay (c) with one or more quaternary alkylammonium salts, separation of the mixture of mineral clays from the aqueous environment by the quaternary alkylammonium salt where the aqueous suspension of chormite clay (a) is produced by (i.1) dispersing a fraction of one or more chormite clays selected from a group comprising sepiolites and palygorskites, in an aqueous environment to produce dispersion, and an aqueous suspension of smectite clay (b) is produced by (ii.1) dispersing a fraction of one or more smectite clays in an aqueous environment to produce dispersion and where the mass content of chormite clay in the joint suspension of clays (c) exceeds the mass content of smectite clay (c); and dispersions obtained in stages (i.1) and (ii.1) are mixed at a high displacement rate prior to stage iii. and/or after stage iii; and where one or more chormite clays used to produce an aqueous suspension of chormite clay (a) have an exchange capacity by methylene blue containg less than 20 mmoles of methylene blue per 100 g of one or more chormite clays in the dry state and before passing the suspension of chormite clay through the standard US sieve of 100 mesh, it has such a distribution of particles by size that at least 90 wt.%, preferably 95 wt.% of chormite clay contained in the aqueous suspension of chormite clay passes through the standard US sieve of 100 mesh, in a liquid composition containing at least one unsaturated complex polyester.
EFFECT: the technical result of the invention consists in obtaining thickening agents for high viscosity liquid compositions with a specified amount of additives modifying the rheological characteristics.
18 cl, 2 tbl, 2 dwg
