Surface Treatment of Calcium Carbonate Using Silane Coupling Agent and Phosphoric Acid and a Study of Their Dispersion Behavior in Water and Toluene

Tavakkoli, V.; Mohseni, M.; Rostami, M.

Surface Treatment of Calcium Carbonate Using Silane Coupling Agent and Phosphoric Acid and a Study of Their Dispersion Behavior in Water and Toluene

Authors

¹ Polymer and Color Engineering Department, Amirkabir University of Technology

² Department of Polymer Engineering and Color Technology, Amirkabir University of Technology

³ Nanomaterials and nanocoatings Department, Institute for Color Science and Technology

Abstract

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.

Keywords