Abstract: Based on TGcurve, the Freeman-Carroll method was applied to calculate the kinetic parameters of the process of dehydration and desulfation of hydrous titanium oxide film on the titania-coated mica pearl pigments.As a result, the kinetic parameters were obtained.The dehydration period: E=93.32 kJ/mol, n=5.16, A=5.31×10¹¹ min^-1; desulfation period: E=l49.25 kJ/mol, n=5.13, A=2.75× 10¹¹ min^-1.Simultaneously, comparing with the kinetic parameters of the hydrous tiania powder obtained under the same condition indicated that both the dehydroation process and the desulfation process were more difficult in pigments than in powder.

Key words: Mica titania, Hydrated titania, Process of dehydration and desulfation, Reaction rate