Abstract:

In this paper , cetyl trimethyl ammonium bromide (CTAB) was used to perform the surface modification of nano-sized calcium carbonate. Then , FT-IR , XRD and TG-DTG were adopted to characterize the samples before and after the modification. Moreover , the Zeta potential , Brookfield viscosity , oil-absorbed value and specific surface area of the samples were measured to evaluate the modification effect. The results indicate 出at the modification by CT AB may result in a chemical adsorption on the surface of nano-sized calcium carbonate , and that the modification with 2.0% of CTAB may cause great changes of the interface characteristics. Concretely , the Zeta potential changes form negative to positive , the Brookfield viscosity greaùy decreases , the oil-absorbed value decreases from 96. 8g to 53. 1g , and the specific surface area increases from 20. 1m²/g to 26. 0m²/g.

Key words: calcium carbonate, cetyl trimethyl ammonium bromide, modification, interface property, dispersion