关键词: 热解炭黑, 改性, 表面能, 能量分布, 补强, 反相气相色谱

Abstract: The recycled pyrolytic carbon black(PC) from used tyre was obtained by atmospheric pyrolysis with a small degree of aggregation,small surface area,and a lot of ashes and carbonaceous deposits. The PC was modified by a series of chemical treatment with nitric acid and nitric acid/stearic acid. Inverse gas chromatography was used to assess the consequence of the modifications. In particular, inverse gas chromatography at infinite dilution was shown to detect essentially the most active sites, and allows monitoring of the variation of surface properties upon chemical modifications of the PC. Inverse gas chromatography at finite concentration was used to characterize the surface energy site distribution.There are many structural defects on pyrolytic carbon black and the surface energy is heterogeneously distributed. In conclusion, nitric acid could decrease the surface carbonaceous deposits, and make more active sites. The retreatment of pyrolytic carbon black with stearic acid would, on one hand, diminish the particle-particle interactions and hence facilitate the dispersion of the filler in the natural rubber matrix and, on the other hand, enhance the compatibility between filler and matrix leading to better mechanical performance of the composite.

Key words: 热解炭黑, 改性, 表面能, 能量分布, 补强, 反相气相色谱