The invention relates to a preparation method of high-grade road emulsified
asphalt. The method adopts the technical scheme that the method comprises the steps: catalytic
cracking heavy
residual oil is heated to be 120-160 DEG C in a
heating furnace and then fed into a stirring kettle; a
diluent, namely
acetone or
tetrahydrofuran is added according to the fact that the ratio of the catalytic
cracking heavy
residual oil to the
diluent is (2.5-3):100; the catalytic
cracking heavy
residual oil is diluted to be low-
viscosity residual oil; the reaction
viscosity is reduced; an emulsifier, a stabilizer, an antifreezing agent, a surfactant, the low-
viscosity residual oil and water are fed into a
colloid mill at a ratio; the temperature of the
colloid mill is kept to be 75-90 DEG C; the high-grade road emulsified
asphalt is prepared via the
colloid mill. The method has the benefits that the
diluent dilutes the heavy residual oil, so that the viscosity of the residual oil is reduced, the
shear resistance in an
emulsion process is reduced, and the reaction efficiency is improved; by virtue of the antifreezing agent, the freezing resistance is good, the long-term storage property is good, the oversize residual amount of the
asphalt is less, and a pungent smell generated due to heating and volatilization of
alcohol soap lye preparation process and an emulsified asphalt production process during single
alcohol use; the surfactant increases a
softening point of an emulsified asphalt product.