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利用差示扫描量热法(DSC)、烘箱老化试验、以及重复加工等3种方法评价不同加量的抗氧剂1010、抗氧剂168对聚丙烯SP179耐热氧老化性能的影响。结果显示:聚丙烯SP179的氧化诱导时间随着抗氧剂总加量的增加而逐渐增大。在烘箱老化试验中,聚丙烯SP179黄色指数变化明显,抗氧剂加量少于3 000 mg/kg时,黄色指数随抗氧剂量的增加而减小,随老化时间的延长而逐渐增大;抗氧剂添加量大于3 000 mg/kg时,黄色指数随着抗氧剂量的增加而增大,随着热氧老化时间的延长先出现小幅下降之后再逐渐增大。当抗氧剂足够时,重复加工对聚丙烯SP179的黄色指数、熔体质量流动速率(MFR)影响不明显。此外,在SP179滚塑成型中,抗氧剂1010为1 000 mg/kg、抗氧剂168为2 000 mg/kg的配方最优。 相似文献
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温度和氧压对沥青吸氧老化性能的影响 总被引:7,自引:1,他引:6
本文在0.12~0.30MPa(O_2)、25~80℃条件下,详细考察了温度和氧压对欢三联直馏沥青和欢喜蛉氧化沥青吸氧老化性能的影响,提出了包含氧压、温度、时间和吸氧量在内的完整吸氧动力学模型,并着重分析了温度和氧庄与总包速度常数或总包最大吸氧量间的关系,揭示了两种不同类型沥青吸氧老化的本质和区别。 相似文献
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石油沥青老化性能研究 总被引:9,自引:2,他引:7
采用薄膜烘箱(TFOT)在不同时间、不同温度下对五种代表性的沥青进行老化。通过对老化前后沥青的质量变化、针入度比、粘度比、沥青质含量的比较得到了五种沥青在不同条件下性质变化规律,提出了用质量损失表征抗老化性能和用延长薄膜烘箱试验时间模拟长期老化的不适宜性。 相似文献
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聚乙烯薄膜的光氧老化及影响因素 总被引:7,自引:0,他引:7
研究了光氧老化过程对聚乙烯薄膜物理性能的影响,对比考察了光稳定剂对不同种类、不同厚度聚乙烯薄膜耐光氧老化性能的影响。结果表明,这种薄膜的老化性能可用力学、热学、光谱参数表征;当薄膜厚度为30-150μm时,不加光稳定剂的薄膜厚度对光氧老化性能的影响不大,加光稳定剂后薄膜厚度对光氧老化性能的影响是随膜厚的增大而迅速增大。 相似文献
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沥青调剖是聚合物驱后进一步提高采收率的有效方法之一,具有调剖强度大、封堵效率高、对地层选择性强、成本低廉、无设备腐蚀、无地层污染等特点,但对其开发方式尚无一个完善、系统的评价。文中利用数值模拟方法,对典型井区进行精细数值模拟研究,针对沥青调剖井组在不同沥青质量浓度、注入速度、调剖半径、调剖时机及段塞组合方式下的驱油效果进行评价及优选,并详细阐述了沥青调剖的机理。结果表明,采用沥青调剖能够达到较好的开发效果,可为厚油层聚合物驱后开展调剖提供开发依据。 相似文献
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Zhe Liu 《Petroleum Science and Technology》2019,37(9):1025-1032
A kind of microcapsule was prepared, and a new type of self-healing asphalt was manufactured by mixing asphalt, microcapsule and curing agent with proper ratio. The ductility(15?°C and 10?°C), softening point and penetration of asphalt were tested both before and after adding microcapsule and curing agent into the asphalt. The results showed that the three indexes were kept in normal ranges after adding microcapsule and curing agent. However, the ductility(10?°C) was lower than the technical standard when the additive amount of microcapsule was 5.0wt%. Whereafter, the influence of additive amount, self-healing temperature and time on the asphalt self-healing property were all investigated by ductility self-healing tests (10?°C). The outcome indicated that the addition of microcapsule into the asphalt promote its self-healing properties obviously. The self-healing rate of blank asphalt in 20?°C and for 3?h was 20%, and when the microcapsule additive amount was 3.0wt%, the rate was improved to 40.0%. The highest self-healing rate was 52.0%. The elevation of temperature and extension of time were both beneficial for the promotion of the self-healing properties of asphalt. However, when healing temperature and healing time were improved to 30?°C and 7?h, the improvement of self-healing rate was not obvious. 相似文献