Study on Preparation and Property of Phenolic-SiO2 Core-shell Composite Hollow Microspheres

The great advantage of hollow SiO2 microspheres is low density and high-temperature resistance, however, the toughness and wear-resisting property is poor, so it can’t be used in the condition of mechanical friction and high-speed shearing. Therefore, phenolic-SiO2 core-shell composite hollow microspheres were prepared by spray coating process, and the properties were measured. The results indicate that the core-shell composite hollow microspheres not only have low density and high-temperature resistance, but also have good toughness and wear-resisting property. The compressive strength was 50 MPa. The density was 0.54-0.65 g/cm3. Temperature resistance was 120 oC. Grain diameter was 2∼300 μm and the percentage of damage on the condition of grinding for 16 h was very low. Phenolic-SiO2 core-shell composite hollow microspheres have good prospect in the field of the development of oil gas and spaceflight.