Abstract：In order to improve the effect of modified sericite and industrial application value, the research of surface modification of sericite by silane coupling agent(KH-550) and the technological conditions were investigated. Wetting contact angle,salicylaldehyde-ethanol chromogenic reaction, FT-IR, the rubber mechanical properties and SEM were used to analyze and characterize modified sericite by KH-550. The results indicate that the most appropriate condition of KH-550 concentration is1.6%(mass fraction), and the treatment temperature is 100 ℃,KH-550 is adsorbed on the sericite surface by chemical bond, and the mechanical properties of rubber is improved with the modified sericite as rubber filler. Therefore, the crystal shape and surface properties of the surface modification of sericite by KH-550 is suitable for special vulcanized rubber reinforcing filler.

Keywords: sericite; silane coupling agent; surface modification; vulcanized rubber