Study On Surface Modification Of Pyrolytic Carbon Black And Reinforcement Of Elastomer

The recovered pyrolytic carbon black(PC) from the used tyre was obtained by atmospheric pyrolysis, having small degree of aggregation and small surface area, having a lot of ashes and carbonaceous deposits. The PC was modified by a series of chemical treatment with nitric acid (WPC)and nitric acid/stearic acid(SWPC). The inverse gas chromatography was used to assess to the consequences of the modifications. In particular., inverse gas chromatography at infinite dilution is 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 has been used to characterize the surface energy site distribution. It is known that there are many structural defects on pyrolytic carbon black and the surface energy is heterogeneously distributed. We present the relatively integral theory of modification. We have analysis the influence of the concentration of nitric acid and the quantity of stearic acid for the result of modification. The main work of the paper list as the following:1. DBF absorption experiment shows that the CBp has low structure. The surface aperture and DBP value of WPC and SWPC are larger than the PC.2. nitric acid can decrease the surface carbonaceous deposits, and make more active sites.But the surface of WPC have too much -OH and -COOH. The WPC particle will reunite and the dispersion is not well.3. The retreatment of pyrolytic carbon black with stearic acid will, on one hand, diminish the particle-particle interactions and hence facilitate the dispersion of the filler in a nature rubber matrix and, on the other hand, enhance the compatibility between filler and matrix which leads to better mechanical performance of the composite.4. From the sulfuration curve of three carbon black, We can see that T10 of WPC and SWPC are larger than PC. This meanes that it is more safer when using WPC or SWPC in industry production. The interaction degree between the carbon andrubber is: WPC