Study on Modification of Lightweight Magnesium Carbonate With Stearic Acid

The lightweight magnesium carbonate was modified by stearic acid,and effects of stearic acid dosage,reaction temperature and reaction time on the modification effect were studied,the best modification conditions were determined at last.Settling volume,oil absorption value and activation grade of the modified lightweight magnesium carbonate were measured and characterized by the infrared spectrum and thermal gravimetric.The result shows that the surface of the modified lightweight magnesium carbonate is changed from hydrophilicity to lipophilicity;the interlinkage between the stearic acid and the lightweight magnesium carbonate is not a simple physical adsorption,but chemical reaction to form a new chemical bond.