Further insight into some properties of pyrolytic carbon black obtained from scrap truck tires
Franco Cataldo
Abstract
The virgin CBp produced from scrap truck tires pyrolysis was analyzed both under N2 and under air flow with thermogravimetric analysis coupled with differential thermal analysis (TGA-DTA). Complementary information was derived from the two analysis. The rubber pyrolytic residues present on virgin CBp are better determined quantitatively by TGA-DTA under N2 flow. On the other hand, for the quantification of pure CBp and moreover of the ashes, the TGA-DTA under air flow is a necessary approach. It was also found that the rubber pyrolytic residues coating the virgin CBp surface can be determined quantitatively by a DSC scan under O2 flow up to 450 °C integrating the exothermal peak at about 340 °C and using as reference the thermo-oxidative enthalpy measured on a reference sample of natural rubber or selected model compounds. It is shown that the light pyrolysis process to clean CBp from the rubber pyrolytic deposits is completely satisfactory when conducted in a DSC scan under oxygen flow rather than under nitrogen flow.