关键词: 硅灰石, 表面改性, 顺丁橡胶, 力学性能, 止滑性能

Abstract: Stearic acid (SA) was used to modify wollastonite, and the effects of wollastonite size and the amount of wollastonite before and after modification on the mechanical properties, vulcanization performance and slip resistance of butadiene rubber (BR) were investigated. The results of infrared spectroscopy and contact angle tests showed the hydrophobicity of wollastonite was obviously improved by the reaction between stearic acid and hydroxyl groups on the surface of wollastonite. The results of mechanical and vulcanization performance tests indicated that the tensile strength and elongation at break of BR composite material with modified wollastonite were significantly improved under the same dosage, while the vulcanization rate decreased. The results of antislip performance test showed that adding modified wollastonite could significantly improve the friction coefficient of BR composite materials on ice and oil surfaces. The scanning electron microscope indicated that the interface gap between unmodified wollastonite and rubber was clear, but the interface gap was blurred after modification. Under the conditions of formula, the tensile strength of BR composite with 40% modified wollastonite was 10.77 MPa, the elongation at break was 803%, and a friction coefficient between oil surface and ice surface was 0.48, which had good mechanical and slip resistance properties.

Key words: wollastonite, surface modification, butadiene rubber, mechanical properties, anti slip performance