利用化学共混法改善重交沥青延度试验

Tests for improving ductility of road paving asphalt by chemical blending technique

中国石油天然气股份有限公司兰州石化分公司炼油厂,在以减压渣油丙烷脱沥青装置的丙烷脱油沥青和减压馏分油酚精制装置的四线抽出油为原料生产重交沥青时,由于沥青原料质量较差,出现调合生产的重交沥青其薄膜烘箱试验前、后延度(15℃)达不到150 cm以上要求,与目前国内优质的重交沥青质量有一定的差距。因此通过试验探讨用化学共混法来改善重交沥青的延度,同时找出改性剂丁苯橡胶粉末和分散稳定剂高岭土的合适加入量。试验结果表明,丁苯橡胶粉末加入量(占重交沥青质量分数)在1.0%时,所制备的重交沥青其薄膜烘箱试验前、后延度(15℃)均大于150 cm,加入适量的分散稳定剂高岭土可以进一步降低丁苯橡胶加入量至0.75%,且热储存稳定性好。在试验中探讨了便于工业生产的加工方式,即把丁苯橡胶粉末加入到抽出油中剪切制成母液后再与脱油沥青混合改性,这样可采用较小的剪切机。

When the paving asphalt was produced from the ,deoiled asphalt from vacuum residue propane deasphalting unit and the 4th side-draw of vacuum distillate phenol refining unit in the refinery of CNPC Lanzhou Petrochemical Company, the ductility of the asphalt failed to meet the 150 cm requirement and the quality of the asphalt was behind the specifications of high quality asphalt. To solve this problem, tests were performed to study the improvement of paving asphalt by chemical blending techniques and find out a proper dosage of SBR powder and kaolin dispersant. The test results showed that, the ductility of asphalt was greater than 150 cm when SBR was added at a dosage of 1.0% of the paving asphalt. The addition of proper amount of kaolin dispersant could further reduce SBR dosage to 0.7% and improve thermal stability of asphalt. If SBR was added to the extract oil and sheared into mother liquid and then blended into the deoiled asphalt for modification, the smaller shearer can be applied.