Study on Surface Modification of Nano-meter Calcium Carbonate With Stearic Acid
In order to improve the dispersion of nano-CaCO3 in matrix,the surface of nano-CaCO3 was modified by stearic acid.The activation degree and oil absorption value of modified nano-CaCO3 were determined by changing the amount of stearic acid,reaction temperature and reaction time,slurry mass concentration.Then the best modification conditions were determined.The experimental results showed that nano-CaCO3 could be modified by stearic acid,and the best experimental modification conditions were as follows:stearic acid mass fraction 4%,slurry mass concentration 90 g·L-1,modification temperature 60～80℃,modification time 50～60 min.The fourier transform infrared spectroscopy showed that stearic acid formed a strong chemical bond with nano-CaCO3,and scanning electron microscopy observed that the modified nano-CaCO3 could reduce the aggregation and contribute to its dispersion in the matrix.
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