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为探究多聚磷酸(PPA)复合改性海缆沥青综合性能与改性机理,对不同掺量PPA与SBR的PPA/SBR复合改性沥青进行常规指标测定实验,通过针入度、冷弯、黏附率以及热稳定性等实验考察PPA复合改性海缆沥青的高低温性能与黏附性能,并采用红外光谱试验、四组分试验、热重试验、核磁共振试验以及荧光显微图像观测试验来分析海缆沥青的复合改性机理,结果表明:PPA能够提高沥青的热储稳定性,SBR能够改善沥青的低温抗裂性能;SBR的改性机理以物理共混为主;PPA以化学改性为主,不仅改变了沥青碳链结构,使其发生磷酸酯化和环化反应,而且也提高了聚合物在沥青中的分布均匀性。 相似文献
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以70号沥青、减压渣油和催化裂化油浆为原料,制备配制沥青原料、油浆改质沥青和SBS改性油浆改质沥青,分析其性质和族组成,探讨了油浆改质沥青性质对SBS改性沥青性质的影响,并结合荧光显微照片,考察了SBS在油浆改质沥青中的分散状态和微观结构。结果表明:芳香分含量较高时,油浆改质沥青的性能较好,SBS与其相容性也较好,从而能够制备出性能较好的SBS改性油浆改质沥青;SBS改性缩合油浆改质沥青的性质优于SBS改性油浆改质沥青的性质,且达到了SBS改性沥青I-D级标准。 相似文献
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SBS的微观结构影响SBS改性沥青的性能。阴离子活性聚合的特点可以实现对分子微观结构的精准控制。SBS的结构参数包括结构类型、分子量、苯乙烯含量、两嵌段含量、乙烯基含量和功能化改性。采用体积排除色谱和核磁共振可测得SBS的分子量和分子量分布、两嵌段含量、苯乙烯含量以及乙烯基含量。星型SBS及分子量大的SBS改性效果好,但与沥青相容性差。苯乙烯含量低的SBS制备的改性沥青热储存稳定性和低温抗裂性好;苯乙烯含量高的SBS制备的改性沥青施工和易性和高温稳定性好。两嵌段可以改善加工性能和低温抗裂性,但会损害高温性能。乙烯基含量高可以改善相容性、耐老化性和高温性能,但对低温性能不利。功能化改性可以提高SBS与沥青之间的相容性。应针对具体的应用场景选择合适结构的SBS改性剂。 相似文献
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采用红外光谱测试技术,基于朗伯-比尔定律对SBR改性乳化沥青进行了改性剂含量测定的试验研究。研究认为,现有规范中对乳化沥青的技术要求太过宽泛,用常规指标的变化规律来检测SBR乳化沥青中的SBR含量是无效的;红外光谱进行SBR含量检测时,应该针对乳化沥青的残留物进行试验,这样可以避免水的影响;采用SBR的966 cm-1吸收峰与沥青的810 cm-1吸收峰高度的比值作为定量分析中的吸收度参数,可以与SBR掺量建立良好的线性关系曲线。利用此方法检测SBR含量是可行的,其检测结果相对误差在-0.14%~0.02%之间,准确度较高。 相似文献
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改性单家寺沥青使用性能的研究 总被引:1,自引:0,他引:1
针对单家寺稠油开采、管道输送过程中注入了蜡含量高的低硫中间基原油影响了沥青质量的问题,研究了加入聚合物对其改性的途径。在单家寺沥青中加入丁苯乳胶(SBR)后的改性沥青及其混合料的使用性能的评价结果表明,改性单家寺沥青的使用性能可满足“八五”国家科技攻关提出的建议值,可用于高等级公路的建设。 相似文献
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USE OF THE ENVIRONMENTAL SCANNING ELECTRON MICROSCOPE TO INVESTIGATE THREE POLYMER MODIFIED ASPHALTS
Laurent C. Michon Theresa M. Williams Francis P. Miknis Jean-Pascal Planche Didier Martin 《Petroleum Science and Technology》2013,31(7-8):797-809
ABSTRACT Polymer modified asphalts present an opportunity to enhance the properties of asphalt concrete for road building where conventional asphalts are not appropriate. In this field, researchers have proposed different kinds of chemical and physical techniques to define the properties of these materials. At the same time, microscopic techniques were being developed to visualize the microstructure of the asphalt. In this paper another microscopic technique using Environmental Scanning Electron Microscopy (ESEM) to investigate the morphological structures of neat polymers and commercial polymer modified asphalts is presented. Samples examined present different kinds of morphology easily observable by ESEM. The two commercial polymer modified asphalts show numerous differences, but after heat treatment they lost their macrostructure. 相似文献
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对影响改性沥青软化点的因素进行了研究,首先对PE、SBS、SBR、EVA四种改性沥青的软化点进行了比较研究,又针对SBS改性沥青研究了基质沥青及SBS的型号、剂量等因素对改性沥青软化点的影响。 相似文献
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对国内常见沥青的感温性能、力学性能进行研究,对目前常用沥青改性剂SBS、SBR、EVA、PE与沥青改性配伍性及效果进行了研究,通过试验筛选出了SS/SBR改性剂和乳化剂,确定了宽域改性乳化沥青的配方和生产工艺。检测结果显示,该宽域改性乳化沥青产品5℃延度大于150cm,软化点大于75℃,提高了改性乳化沥青的性能。实现了沥青性能在感温性方面的宽域。 相似文献
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Mohammed Farhat Ali I.M. Asi H.I. Al-Abdul Wahhab I.A. Al-Dubabe 《Petroleum Science and Technology》1999,17(1):125-145
The rheological properties of polymer modified Arab asphalts were characterized using both routine test methods, such as penetration and softening point, and more rigorous methods, which included low temperature stiffness measurements using a bending beam rheometer, and dynamic mechanical analysis using dynamic shear rheometer. HP-GPC method of analysis was used to produce profiles of the molecular size distribution of the modified asphalts. Models were built to predict the rheological and performance-based properties from the HP-GPC profiles. The results indicated that polymer modification is capable and effective in improving the neat Arab asphalt binders rheological properties to meet and satisfy the performance requirements of the Gulf countries. 相似文献
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《Petroleum Science and Technology》2013,31(3-4):367-376
ABSTRACT The effect of different base asphalts on the styrene butadiene styrene (SBS) modification had been studied in this paper and the solubility parameter theory was used to predict its modification effect. The results showed that the compatibility between the base asphalt rich in aromatics and SBS was good. The closer the polarity of the two substances, the smaller the difference of their solubility parameter, the more easily they are miscible. Therefore, the solubility parameter between the modifier SBS and the base asphalt can be used to evaluate their compatibility. To find a suitable blender (or stabilizer) based on the solubility parameter model is one of the best methods to reduce the difference of the solubility parameter between SBS and the base asphalt and decreased the isolation of SBS in the polymer–asphalt mixture. 相似文献
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Mohammed Farhat Ali I.M. Asi H.I. Al-Abdul Wahhab I.A. Al-Dubabe 《Petroleum Science and Technology》2013,31(1-2):125-145
Abstract The rheological properties of polymer modified Arab asphalts were characterized using both routine test methods, such as penetration and softening point, and more rigorous methods, which included low temperature stiffness measurements using a bending beam rheometer, and dynamic mechanical analysis using dynamic shear rheometer. HP-GPC method of analysis was used to produce profiles of the molecular size distribution of the modified asphalts. Models were built to predict the rheological and performance-based properties from the HP-GPC profiles. The results indicated that polymer modification is capable and effective in improving the neat Arab asphalt binders rheological properties to meet and satisfy the performance requirements of the Gulf countries. 相似文献