Influence of composite modifier on the modification of calcium carbonate powder

The modification of CaCO3 powder was studied by the composite modifier in n-butanol and water solution. Aluminate coupling agent (ACA) and stearic acid (SA) were added as the composite modifier. The characters of modified CaCO3 were investigated by the contact angles and infrared spectroscopy (IR). It was found that the contact angles/water of modified CaCO3 powder increased with the increase of SA/ACA weight ratio, and showed a maximum when ratio was 0.8:1. The contact angles/water of modified CaCO3 powder obtained in optimum conditions was 136.5 degrees. The results indicated that the surface character of CaCO3 powder exhibited hydrophobic properties. When adding the active CaCO3 into PE (the weight ratio of CaCO3/PE about (20:100), the mechanical properties of PE were remarkably improved.