Provided are a kind of
lignin modified
asphalt, a preparation method therefor and applications thereof. The modified
asphalt is prepared after the following steps: first,
lignin extraction is carried out; second,
lignin refining is carried out; third, lignin modification is carried out; fourth, the modified lignin obtained from the third step and
petroleum asphalt are placed in a reaction vessel, Na2S is added, the reaction is for 30min, and lignin modified asphalt is obtained after postprocessing. In the method, lignin is extracted from waste
papermaking black liquid, asphalt is subjected to
chemical modification by utilization of lignin after refining and modification, and lignin modified asphalt is obtained. The
corrosion resistance of the modified asphalt is comparable to that of asphalt before modification, the elastic
recovery rate of the modified asphalt is higher than that of asphalt before modification by 1.2%, the
viscosity of the modified asphalt is higher than that of asphalt before modification at the same temperature, and therefore the performances of the modified asphalt is comparable to that of unmodified asphalt, so asphalt can be replaced by the lignin modified asphalt, not only
petroleum resource is saved but also secondary utilization of waste
papermaking black liquid is achieved.