Compound modified asphalt and preparation method thereof
A technology of compound modified asphalt and modifier, applied in building components, building insulation materials, buildings, etc., can solve the problems of limited improvement range and insignificant overall improvement effect of asphalt performance, so as to improve rutting resistance and alleviate white Pollution, simple process effect
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[0032] The preparation method of above-mentioned compound modified asphalt, carry out according to the following steps:
[0033] Weigh 0.5% to 12% of packaging waste polymer PE, 0.01% to 1% of chopped polyacrylonitrile (PAN)-based carbon fiber, and 87% to 99.49% of matrix pitch, respectively, according to mass percentage, the sum of the mass percentages of the above components is 100%;
[0034] a. Co-extrude the packaging waste polymer PE and chopped polyacrylonitrile-based carbon fiber on an extruder. The specific process is: double-roller kneading → high-speed crushing → twin-screw extrusion → material making → drying to obtain Modifier;
[0035]b. Heat the base asphalt to melt, keep the temperature at 150-200°C, add the modifier prepared in step a, stir manually for 20-40 minutes, then stir with shears for 80-100 minutes, cool down to 100-150°C, and place 20~50min, make it fully swell;
[0036] c. Shear the asphalt mixture obtained in step b for 80 to 100 minutes on a sh...
Embodiment 1
[0049] According to the mass percentage, 12% of packaging waste polymer PE and 1% of chopped PAN-based carbon fiber were co-extruded on an extruder to prepare the modifier. Take the base asphalt with a mass percentage of 87% and heat it to melt, keep the temperature at 150°C, add the prepared modifier, stir manually for 20 minutes, stir with a shear for 90 minutes, cool down to 150°C, and let it stand for 50 minutes to fully swell; Cut again on the shearing machine for 80 minutes until the co-extrusion modifier of the packaging waste polymer PE and the chopped PAN-based carbon fiber is uniformly dispersed in the asphalt.
[0050] The softening point and penetration of the modified asphalt prepared in Example 1 were 139.5°C and 26.8 (0.1 mm), respectively.
Embodiment 2
[0052] According to the mass percentage, 4% of the packaging waste polymer PE and 0.05% of the chopped PAN-based carbon fiber were co-extruded on an extruder to prepare the modifier. Take 95.95% of the base asphalt by mass and heat it to melt, keep the temperature at 180°C, add the prepared modifier, stir manually for 30 minutes, stir with a shear for 80 minutes, cool down to 120°C, and let it stand for 30 minutes to make it fully swell; Cut again on the shearing machine for 90 minutes until the co-extrusion modifier of the packaging waste polymer PE and the chopped PAN-based carbon fiber is uniformly dispersed in the asphalt.
[0053] The softening point and penetration of the modified asphalt prepared in Example 2 were 82.6°C and 48.1 (0.1 mm), respectively.
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