On the basis of research summarization of the pour point depressant for crude oil, the paper summarizes the influence of repeated heating and shear on the modified effect of crude oil treated with PPD,and points out that in the research of pour point depressant the property of anti-repeated heating and anti-shear of PPD to the modified effect should be enhanced.

Research both the mutual adaptability of SBS and asphalt from different sources and the changing regularity of modified effect and industrial,meanwhile, modification mechanism is analyzed by some chemical analysis means with the theory of polymer physic