| 摘要 |
FIELD: construction.SUBSTANCE: invention relates to mineral suspensions used in concrete, sealants, paper, paint or plastic. Described is a method of bleaching surface of suspension of mineral substances. Method includes: a) preparing an aqueous mineral suspension by dispersion and/or grinding; b) adding during and/or after step a) 0.005-0.5 wt% alkylene oxide block or random copolymer. Mineral substances are selected from a group of calcium carbonate. Dispersion is carried out in presence of an anionic dispersant and/or grinding intensifier to obtain particles with average size dfrom 0.2 to 10 mcm.EFFECT: invention provides high degree of bleaching surface of aqueous mineral suspension.15 cl, 1 tbl, 9 ex |
