Surface Treatment of Calcium Carbonate Using Silane Coupling Agent and Phosphoric Acid and a Study of Their Dispersion Behavior in Water and Toluene
This work reports the surface treatment of calcium carbonate using a silane coupling agent. To this end, a direct method was used in which different parameters including temperature, pH as well as hydrolysis method were studied. Sample characterization was performed utilizing FT-IR spectroscopy, thermal gravimetric analysis and turbidimetry. It was revealed that the coupling agent is unable to chemically attach to the surface unless a pretreatment with phosphoric acid was conducted. The amount of silane analyzed in the presence of this acid was measured to be 1.67 wt% in which 1.06 wt% was found physically bonded to the surface, while 0.61 wt% remained chemically attached. The dispersion behavior of the treated particles was studied in water and toluene using turbidimetric analysis. J. Color Sci. Tech. 3(2010),209-221 © Institute for Color Science and Technology.
Journal of Color Science and Technology, Volume:3 Issue:4, 2010
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