Surface Characteristics of St-modified CaCO3 Particles by Emulsion Polymerization

摘要

1.Introduction The industrial importance of ground calcium carbonate (GCC) as a filler in composite materials such as plastics, rubbers, paints, encapsulant and paper is well recognized [1]. However, the GCC has some disadvantages itself. The character of conglomerating by its high surface energy, the incompatibility of its high energetic hydrophilic surface with the low energy surface of hydrophobic polymers are problems to be solved before it can be used as functional filler. Some measurements should be taken to improve the property of the calcium carbonate. Surface modification, a key process in functional powder preparation, is commonly used to achieve this purpose. The surface of calcium carbonate is often rendered organophilic by a variety of surface modifiers such as stearic acid, titanate coupling agents, aluminate coupling agents or silane coupling agents[2-3]. Recently, researchers pay more attention to treat calcium carbonate with polymer. In this paper the GCC is modified by means of an emulsion polymerization method.