Abstract: Residue is rich in polycyclic aromatics with large carbon residue and high oxygen index, so it has stable thermal stability and flame retardancy. Aromatics are obtained by separating the residue, hydroxyl groups are introduced into their structures by chemical modification method, and flame retardant with aromatic phosphate ester is got by reacting with phosphorus oxychloride. The results of FTIR，TG/DTG, carbon residue and oxygen index show that a new type of residue flame retardant with flame retardancy is successfully synthesized. The flame-retardant PE is characterized by LOI and the UL-94 tests. The results show that the modified residue have great flame retardant. The synthesis of aromatic ester flame retardants modified by residuum and the compounding of them into new intumescent flame retardants can not only be used to prepare flame retardant polymers, but also provide a new source of raw materials for flame retardants synthesis and open up a new way for high value-added utilization of residue.

Key words: residue, modification, flame retardancy, flame retardant