The invention provides a ready-to-use high-dispersion high-
viscosity modifier and a preparation method thereof. The modifier comprises, by weight, 20-60 parts of
polymer modifier, 5-10 parts of swelling agent, 20-45 parts of dispersing agent, 4-10 parts of
plasticizer and 0.2-0.5 part of crosslinking agent. The method includes the following steps that first, the
polymer modifier and the swelling agent are heated for 30-60 minutes at the temperature of 100 DEG C to be swelled to be in a flowing state, then the mixture is poured into the dispersing agent which is already heated to be in a flowing state, the
plasticizer and the crosslinking agent are added, and then the mixture is sheared for 5-15 minutes through a high-speed shearing
machine, wherein the rotating speed of the high-speed shearing
machine is 1000-3000 r / min, and the temperature ranges from 140 DEG C to 180 DEG C; after completion, the mixture is poured into an evaporating vessel, then the evaporating vessel is put into a
vacuum drying box of 120 DEG C to be kept warm for 1 h, and then the mixture is pulled into strips, extruded out and granulated through a single-screw extruder. The production cost is low, dispersion and evenness are excellent, the high-temperature stability of high-
viscosity modified
asphalt can be further improved, and social and
economic benefits are remarkable.