The polymer modification in asphalt concrete.

摘要

"Polu00ecmero for modification in asphalt concrete.This invention describes a procedure for the synthesis of a polymer of styrene - butadiene, which is particularly useful for modification of asphalt to improve the ductility forced.The elastic recovery, the rigidity and toughness, by a process comprising the steps of: (1) continuous feeding of monomer 1,3-butadiene, an organo lithium compound.A polar modifier and an organic solvent to a first polymerization zone (2) to let the monomer of 1.3 - butadiene polymerizes in the said first polymerization zone to a conversion of at least about 90 percent, to produce a polymer solution live.It is understood that the said organic solvent and the chains of polybutadiene having a molecular weight of live, numerical medium which is within the range of about 20000 to about 60.000, (3) a continuous withdrawal of said polymer solution of said first reaction zone live, (4) the continuous feeding of monomer of styrene,Divinyl benzene and the solution of polymer alive and withdrawal of the first polymerization zone to a second polymerization zone (5) allow for the polymerization of styrene monomer and the monomerOf divinyl benzene in the second zone of polymerization, to produce a polymer solution of styrene - butadiene.Having a molecular weight of numerical medium that is within the range of about 30000 to about 85.000 and (6) to remove the solution continuously from said polymer of styrene butadiene polymerization of the second zone.