A kind of nano-modified asphalt and preparation method thereof
A nano-modification, asphalt technology, applied in building components, building insulation materials, buildings, etc., can solve the problems of easy degradation and poor durability of asphalt materials, and achieve the effect of degrading automobile exhaust, reducing penetration and improving aging performance
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[0031] A preparation method of nano-modified asphalt, comprising the following steps
[0032] Step 1, weighing base asphalt, SBS, nanomaterials, surfactants, cross-linking stabilizer raw materials according to the number of parts by mass;
[0033] Step 2, heating and keeping the base asphalt warm; the heating temperature range of the base asphalt is 120-160°C;
[0034] Step 3, adding SBS, nanomaterials and surfactants into the base asphalt in sequence, mixing and stirring to obtain a blend; the stirring time is set at 30-60 minutes. The stirring temperature is controlled at 160-190°C.
[0035] Step 4. The above-mentioned blend is sheared and ground for the first time with a colloid mill or a shearing machine; during the grinding process, the rotational speed of the shearing machine is set at 4000-6000 r / min, and the shearing time is set at 10-20 min.
[0036] Step 5, adding the cross-linking stabilizer to the mixture after shearing and grinding and stirring evenly, and perfo...
Embodiment 1
[0039] The nano-modified asphalt raw materials in this example are calculated according to the mass fraction: 100 parts of No. 70 road petroleum asphalt, SBS: 2 parts, nano-CaCO 3 : 1 part, nano-ZnO: 0.5 part, nano-TiO 2 : 0.5 parts. Span80: 3 parts, sulfur crosslinking agent: 0.4 parts.
[0040] Heat 500g of base asphalt to 150°C, add 10g of SBS, and then sequentially add 5g of nano-CaCO 3 , 2.5g nano ZnO and 2.5g nano TiO 2, then add 15g Span80, raise the temperature to 180°C, stir for 40min, perform the first shearing, the maximum shear rate is 5000r / min, and the shearing time is 15min, after adding 2g of cross-linking agent, perform the second shearing, the maximum The shear rate is 7000r / min, and the shear time is 10min. Complete sample preparation.
Embodiment 2
[0042] The nano-modified asphalt raw materials in this example are calculated according to the mass fraction: 100 parts of No. 70 road petroleum asphalt, SBS: 3 parts, nano-CaCO 3 : 2.5 parts, Nano TiO 2 : 1 serving. Span60: 3 parts, sulfur crosslinking agent: 0.5 parts.
[0043] Heat 500g of base asphalt to 145°C, add 15g of SBS, and then sequentially add 7.5g of nano-CaCO 3 , 5g nano-TiO 2 , then add 15g Span60, raise the temperature to 180°C, stir for 45min, perform the first shearing, the maximum shear rate is 5000r / min, and the shearing time is 20min, after adding 2.5g of cross-linking agent, perform the second shearing, The highest shear rate is 7500r / min, and the shear time is 10min. Complete sample preparation.
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