基于增韧特性的环氧沥青制备及性能研究

发布时间：2018-02-24 17:15

  本文关键词： 环氧沥青 超支化聚合物 增韧改性 相容性 粘度 力学性能 模量　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：环氧沥青因其强度高、刚性大、粘接性和耐久性好、耐磨及抗滑性优等优越性能,在实际工程中得到普遍应用。但与进口环氧沥青相比,国产环氧沥青存在着技术不成熟、性能较差和性能不稳定等问题。除此以外,环氧沥青普遍存在着相容性差、韧性低的缺点。因此,改进和研发性能优异的环氧沥青对国产环氧沥青的推广使用具有重要意义。本文以研制一种性能优异的环氧沥青为目的,制备出一种新型胺类固化剂,通过正交试验确定了自制环氧沥青(EA)三组分:环氧树脂、固化剂和基质沥青的最佳配比,提出了EA的制备工艺与养护条件,并将EA的粘度、力学性能、DMA模量以及混合料的马歇尔稳定度等性能与对照样品进行了对比;针对EA韧性略差于进口环氧沥青这一问题,制备出3种不同的超支化聚合物对其进行增韧改性,研究各增韧剂的改性效果;测定各改性环氧沥青粘度随时间的变化及粘度在不同温度下的变化特性,同时测其力学性能,并采用索氏提取、微观结构分析和DMA动态力学热分析三种方法研究了各改性环氧沥青的相容性及粘弹特性。研究结果表明:EA在165℃条件下可保持低粘度状态180min以上,更利于工程应用中材料的运输与施工;与对照样相比,EA固化后的拉伸强度较高,相容性较好,且在低温下有较高的储能模量,EA成型的混合料容留3h后具有优异的力学性能,但不足之处是EA韧性略差于进口环氧沥青。制备的三种增韧剂中H102-100C系列对环氧沥青的改性效果最好,可有效地控制固化反应速率,并且增韧后的环氧沥青粘度在高温条件下对温度的敏感性较小;H102-100C系列增韧剂的加入不仅提高了环氧沥青的韧性,还可改善环氧沥青的相容性,使环氧沥青整体以树脂为连续相,沥青为分散相,且分散较为均匀;除此以外,DMA模量分析结果显示其低温性能也为最佳。综合分析,不同环氧沥青的优劣排序为:EA+H102-100C18EA+H102-100C2EAEA+SBSEA+HBPB,其中EA+H102-100C18与EA+H102-100C2这两种环氧沥青性能优于进口环氧沥青。
[Abstract]:Epoxy asphalt has been widely used in practical engineering because of its high strength, high rigidity, good adhesion and durability, excellent wear resistance and skid resistance. However, compared with imported epoxy asphalt, domestic epoxy asphalt has immature technology. Besides, epoxy asphalt has the disadvantages of poor compatibility and low toughness. The improvement and development of epoxy asphalt with excellent performance is of great significance to the popularization and use of domestic epoxy asphalt. In this paper, a new amine curing agent is prepared for the purpose of developing a kind of epoxy asphalt with excellent performance. The optimum ratio of epoxy resin, curing agent and base asphalt was determined by orthogonal test. The preparation process and curing conditions of EA were put forward, and the viscosity of EA was determined. The mechanical properties such as DMA modulus and Marshall stability of the mixture were compared with the control sample, and three kinds of hyperbranched polymers were prepared to toughen and modify EA, aiming at the problem that the toughness of EA was slightly worse than that of imported epoxy asphalt. The modification effect of each toughening agent was studied, the change of viscosity with time and the change of viscosity at different temperature were measured, and the mechanical properties of the modified epoxy asphalt were measured, and the Soxhlet extraction was used. The compatibility and viscoelastic properties of modified epoxy asphalt were studied by three methods of microstructure analysis and DMA dynamic mechanical thermal analysis. The results showed that the viscosity state of the modified epoxy asphalt could be maintained at 165 鈩，

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