Reducing Benzo(a)pyrene Content of Coal-tar-pitch Modified by Styrene-butadiene Rubber Through Dynamic Vulcanization

摘要

Coal tar pitch (CTP) mainly consists of polycyclic aromatic hydrocarbons (PAHs), some of which are carcinogenic. Among PAHs, benzo(a)pyrene (BAP) as one of the most prominently reported carcinogens which present in CTP causes the concerns of environmentalists. In this work, CTP was modified by styrene-butadiene rubber (SBR) through dynamic vulcanization. Ultraviolet-visible spectrophotometry (UV-VIS) was used to measure the content of BAP. After SBR modification through dynamic vulcanization, the BAP content have been reduced to 50%. With increasing the content of SBR, the content of BAP further reduced. The light component of the modified CTP decreased by the SBR modifier, verified by Headspace gas chromatography-mass spectrometry (GC-MS). Meanwhile, the SBR modifier has improved physical properties of the CTP, such as softening point, ductility, flowing property at high temperature. When the SBR content reached to 6 from 5.5, the softening point increased dramatically to 99 from 50.5. Thus, the modified CTP has various potential applications such as road pavement and carbon binder.