Preparation of CaCO₃-SiO₂ composite with core-shell structure and its application in silicone rubber

Abstract

Abstract A new CaCO 3 -SiO 2 composite with core-shell structure was successfully prepared by mechano-chemistry method (MCM). SEM and FTIR indicated that SiO 2 particles were homogeneously immobilized on the surface of CaCO 3 . The well dispersion of this CaCO 3 -SiO 2 composite into silicone rubber can not only reduce the usage amount of SiO 2 , but also improve the mechanical properties of silicone rubber. By the calculation, the theoretical numbers of the SiO 2 particles is about 10 times as large as that of CaCO 3 particles in the CaCO 3 -SiO 2 composite. Mixing CaCO 3 -SiO 2 composite in silicone rubber can enhance the breaking strength of the silicone rubber about 18% as high as that when mixing the pure SiO 2 . And the elongation at break is about 14% less than that of adding the pure SiO 2 sample.