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

Therefore,two kinds of chemicals that specially has obvious effects for high wax and asphaltene contents of Donglin pipelining crude oil have been developed and e-valuated,and meantime,a chemical having a good modifying effect for Donglin pipelining crude oil has been duplicated and their optimal proportion has been determined.

Evaluation of modification effect of epoxy resin based on performance of asphalt mixtures;