Preparation method of modified asphalt

摘要: The invention relates to a preparation method of modified asphalt. comprises the following steps: measuring total content active hydrogen in asphalt; heating melt asphalt, adding an asphalt diluent, evenly stirring, temperature 110 140 DEG C, isocyanate with molecular weight less than 800 atmosphere dry nitrogen gas, wherein ratio -NCO radical is (1.05-10):1; carrying out reactions for 3 24 hours at controlled 40 150 percentage group until reaches required value; cooling, inflating and packaging. displacement used as filling material reduced during actual application process, thus performance finish product using improved, moreover compatibility between polyurethane prepolymer improved.