EFFECT OF SILANE SURFACE TREATMENT ON RHEOLOGY OF POWDER SUSPENSION

The rheological behaviors of the suspension composed of unmodified or modified mica with paraffin were determined, and the effect of surface treatment is evaluated through viscosity measurement of the suspension system. The results show that the viscosity of modified suspension appear a significant change from the unmodified system, but the viscosity of the suspending system decrease with the rising of its shear rate, even after the mica powder is modified or the environmental temperature is changed. Meanwhile, the experimental results can be satisfactorily correlated with Casson model rather than Bingham and HerschelBulkley model. In addition, the effect of surface treatment on powder(mica) depends on many factors, such as the concentration of coupling agent solution, dosage of coupling agent, solvent of coupling agent solution, and reaction temperature, while showing little relationship with reaction time.