Method for modifying asphalt by concurrently using waste printed circuit board pyrolytic oil heavy fractions and styrene butadiene rubber
A technology of waste circuit boards and styrene-butadiene rubber is applied in the field of resource utilization of electronic waste, which can solve the problems of high price, increase the cost of asphalt use, increase the use of various road materials, etc., and achieves increased feasibility and asphalt. Overall performance improvement and cost reduction effect
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Embodiment 1
[0025] (1) Put the circuit board with electronic components removed into a pyrolysis furnace, heat it to 450°C, keep it for 1 hour until it is completely pyrolyzed, and collect the pyrolysis oil produced after pyrolysis;
[0026] (2) Fractionate the circuit board pyrolysis oil at atmospheric pressure, and retain the high-temperature heavy fraction of the pyrolysis oil above 340°C. If the equipment conditions permit, the fractionation temperature of the heavy fraction can be increased to 360°C to reduce the volatile components in the heavy fraction;
[0027] (3) Grind and sieve the high-temperature heavy fraction of circuit board pyrolysis oil that is solid at room temperature, and select the heavy fraction powder greater than 200 meshes as an asphalt admixture;
[0028] (4) adding 2 parts by weight of circuit board pyrolysis oil heavy fraction to 98 parts by weight of 130-160°C hot petroleum asphalt, and insulated and stirred for 0.75 hours;
[0029] (5) Add 8 parts by weight ...
Embodiment 2
[0032] Same as Example 1, the difference is that in step (4), 5 parts by weight of circuit board pyrolysis oil heavy fraction is added as a modifier to 95 parts by weight of hot petroleum asphalt at 130-160 °C , heat-insulated and stirred for 0.75 hours; in the step (5), 5 parts by weight of SBR were added to the mixed asphalt prepared in the step (4) of 95 parts by weight. In asphalt, heat preservation and stirring for 0.75 hours to obtain modified asphalt.
[0033] The softening point of the modified asphalt is 50.4°C, the penetration is 6.86mm, the ductility at 15°C is 47.7cm, the Marshall stability is 15.7kN when the asphalt ratio is 4.5, and the dynamic stability of the rutting test is 3868.92.
Embodiment 3
[0035] Same as Example 1, the difference is that in step (4), 7 parts by weight of circuit board pyrolysis oil heavy fraction is added as a modifier to 93 parts by weight of hot petroleum asphalt at 130-160 °C , heat-insulated and stirred for 0.75 hours; in the step (5), 3 parts by weight of SBR were added to the mixed asphalt prepared in the step (4) of 97 parts by weight. In asphalt, heat preservation and stirring for 0.75 hours to obtain modified asphalt.
[0036] The softening point of the modified asphalt is 53.8°C, the penetration is 5.56mm, the ductility at 15°C is 40.2cm, the Marshall stability is 16.4kN when the asphalt ratio is 4.5, and the dynamic stability of the rutting test is 5123.04.
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