Additive Composition for Polymer-Modified Asphalt, Polymer-Modified Asphalt Composition Comprising the Same, and Method for Preparing the Same

摘要

One aspect of the present invention provides an additive composition for polymer-modified asphalt including a block copolymer having a radial structure and a copolymer of an aromatic vinyl compound of which two ends have different molecular weights and a conjugated diene compound, and a method of preparing the same. When asphalt is prepared using the additive composition for polymer-modified asphalt, properties of the existing polymer-modified asphalt may be maintained while content of sulfur may be reduced, viscosity may decrease, and thereby processability and pavement performance may be improved.

主权项

1. An additive composition for polymer-modified asphalt, comprising:
a first copolymer compound having a radial structure and represented by the following Formula 1; and a second copolymer compound represented by the following Formula 2:
(A-B)nX  [Formula 1]A-B—B′-A′  [Formula 2] wherein each of A and A′ is an aromatic vinyl compound having a different molecular weight, each of B and B′ is a conjugated diene compound, n is one of the integers from 3 to 6, and X is a residue of a coupling agent.