▎ 摘　　要

NOVELTY - Modified asphalt prepared by modifying nitrogen-sulfur co-doped graphene with substrate asphalt, where the mass ratio of nitrogen-sulfur co-doped graphene and substrate asphalt base modified asphalt is 6-13 (wt.%), is claimed. USE - The method is useful for preparing modified asphalt (claimed). ADVANTAGE - The modified asphalt has anti-stripping performance (claimed). The method: can effectively improve the cohesive strength; provides good compatibility; can generate strong absorption; can improve the interfacial adhesion of the modified asphalt; can comprehensively improve cohesive force of the adhesion; and improves water damage performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing modified asphalt, comprising heating and melting the substrate asphalt (13 wt.%), keeping temperature is 130-160 degrees C, adding sulfur-nitrogen co-doped graphene, mechanically stirring for 1-3 hours to make the nitrogen-sulfur co-doped graphene is sufficiently scattered in the substrate asphalt, raising the temperature to 170-190 degrees C, keeping the temperature for 2-5 hours to achieve cross-linking reaction under the action of mechanical mixing, reducing the temperature to 140-160 degrees C, high speed shearing for 2-4 hours to improve the uniformity of the product to obtain modified asphalt.