FIELD: chemistry.
SUBSTANCE: method includes stabilising an aqueous mineral preparation, which includes steps: (a) adding at least one aldehyde-containing and/or aldehyde-releasing and/or phenolic and/or isothiazoline biocide to said aqueous mineral preparation. Said mineral contains at least one of: ground natural calcium carbonate, precipitated calcium carbonate, dolomite, surface-reacted calcium carbonate, clay, talc, TiO2, kaolin, kaolinitic clay, calcined kaolinitic clay, calcium sulphate, quartz, attapulgite, montmorillonite, diatomaceous earth, finely ground silica, aluminium oxide, aluminium hydroxide, silicates such as aluminium silicate, pumice and sepiolite, or mixtures thereof. A step (b) is carried out, which may be simultaneous and/or separate from step (a), by adding at least one linear or cyclic diamine or triamine compound to said aqueous mineral preparation, the linear or cyclic diamine or triamine compound having at least one primary amine group, and where the linear diamine or triamine compound has the following formula (I) 
: where m equals 0 or 1, n equals an integer from 2 to 8, o equals an integer from 0 to 3, R1 is a C1-C12 alkyl group and particularly CH3, CH2CH3 or a linear C12H25 alkyl group, and R2 is CH3 or NH2, under the condition that if m=0, then o=0 and R2 is NH2; and where the cyclic diamine or triamine compound has one of the following formulae (II) 
and (III) 
, where k and l are identical or different and are equal to 0 or 1, R3 is H or CH3, R4 and R5 are identical or equal and are selected from H and CH3. Said biocide(s) are added to said aqueous preparation in an amount of 90-1350 ppm based on the weight of the aqueous phase of said aqueous preparation; and said linear or cyclic diamine or triamine compound(s) are added to said aqueous preparation in an amount of 600-1200 ppm, based on the weight of the aqueous phase of said aqueous preparation.
EFFECT: invention improves stability of the preparation.
20 cl, 8 tbl, 3 ex
