Low-viscosity toughening asphalt modifier as well as preparation method and application thereof

Abstract

The invention discloses a preparation method of a low-viscosity toughening asphalt modifier, which comprises the following steps: 1) adding an organic ester compound, a vulcanizing agent, an accelerant, a polymer elastomer and an anti-aging agent into a reaction kettle, uniformly mixing at a rotating speed of 2000-3000r, and carrying out heating reaction to obtain a mixture; and 2) shearing and dispersing the mixture at a shearing rate of 3000-4000 r / min for 0.5-1 h, cooling, and standing to obtain the asphalt modifier. According to the low-viscosity toughening asphalt modifier provided by the invention, the accelerant enhances cohesive energy of the organic ester compound through vulcanization at high temperature, and synergistic viscosity reduction and toughening of a polymer elastomer are realized; a high-frequency stirring and shearing dispersion process is combined, part of covalent bonds in the chemical structure of the polymer elastomer in the system are broken to form a uniformly dispersed liquid mixture, the molecular weight of the mixture is smaller than that of the original elastomer, and reduction of the molecular weight is beneficial to reduction of the viscosity of the material.

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