Preparation method for hyperbranched polyurethane-modified asphalt with temperature sensibility controllable

The invention provides a preparation method for hyperbranched polyurethane-modified asphalt with the temperature sensibility controllable, and belongs to the field of road materials. The preparation method is characterized in that a hyperbranched polyurethane material with the phase-change energy storage performance is taken as an asphalt modifier, and the modified asphalt material with the temperature sensibility controllable is obtained in a physical blending modification mode. The preparation method mainly comprises the following steps that 1, hyperbranched polyester is taken as a hard segment to react with isocyanate-terminated polyethylene glycol to obtain a hyperbranched polyurethane phase change material; 2, hyperbranched polyurethane obtained in the step 1 is taken as the asphalt modifier, and the hyperbranched polyurethane-modified asphalt with the temperature sensibility controllable is obtained in an asphalt melting state in the physical blending modification mode. Compared with the prior art, the