Micro-modified blended asphalt and preparation method thereof
A blending and modification technology, which is applied to building components, building insulation materials, buildings, etc., can solve the problems that the product indicators cannot meet the technical requirements of A-grade asphalt, cannot meet the technical requirements of A-grade asphalt, and the improvement effect of indicators is not obvious. Achieve the effects of stable performance, excellent performance and improved anti-aging performance
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[0032] The present invention also provides a method for preparing the micro-modified blended asphalt described in the above technical solution, which is characterized in that it comprises the following steps:
[0033] a) blending deoiled asphalt and vacuum residue to obtain blended asphalt;
[0034] b) slightly modifying the blended pitch obtained in step a) by using SBR to obtain a slightly modified blended pitch.
[0035] The invention firstly blends the deoiled asphalt and the vacuum residue to obtain the blended asphalt. In the present invention, the deoiled bitumen and the vacuum residue are the same as those in the above technical solution, and will not be repeated here.
[0036] In the present invention, the blending method is preferably stirring; the stirring temperature is preferably 100°C to 180°C, more preferably 140°C to 160°C; the stirring time is preferably 20min to 200min, more preferably 20 min to 40 min; the stirring speed is preferably 500 r / min to 1000 r / m...
Embodiment 1
[0048] Use deoiled asphalt (penetration at 25°C 0-20dmm, softening point 60°C-70°C), vacuum residue (penetration at 25°C 300-400dmm, softening point 20°C-30°C, flash point 300°C- 350°C) and SBR (white particles, the styrene binding content is 20% to 28%, and the bulk density is 0.2g / cm 3 ~0.8g / cm 3 ) is mixed according to the ratio of mass ratio 35:65:0.5; the specific process of the mixing is as follows:
[0049] Stir the above-mentioned deoiled asphalt and vacuum residue at 150°C for 30min (rotating speed: 700r / min), then add SBR, stir at 170°C for 10min (rotating speed: 700r / min), and shear at 180°C for 15min ( Rotating speed is 5000r / min), stirring at 170°C for 60min (rotating speed is 700r / min), to obtain finely modified blended asphalt mixed uniformly.
[0050] After testing, the properties of the micro-modified blended asphalt provided in Example 1 of the present invention are shown in Table 1.
[0051] Table 1 The performance data of the micro-modified asphalt that ...
Embodiment 2
[0056] Use deoiled asphalt (penetration at 25°C 0-20dmm, softening point 60°C-70°C), vacuum residue (penetration at 25°C 300-400dmm, softening point 20°C-30°C, flash point 300°C- 350°C) and SBR (white particles, the styrene binding content is 20% to 28%, and the bulk density is 0.2g / cm 3 ~0.8g / cm 3 ) is mixed according to the ratio of mass ratio 35:65:1; the specific process of the mixing is as follows:
[0057] Stir the above-mentioned deoiled asphalt and vacuum residue at 150°C for 30min (rotating speed: 700r / min), then add SBR, stir at 170°C for 10min (rotating speed: 700r / min), and shear at 180°C for 15min ( Rotating speed is 5000r / min), stirring at 170°C for 60min (rotating speed is 700r / min), to obtain finely modified blended asphalt mixed uniformly.
[0058] After testing, the properties of the micro-modified blended asphalt provided in Example 2 of the present invention are shown in Table 2.
[0059] Table 2 The performance data of the micro-modified asphalt that Ex...
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