| 引用本文: | 陈黎维,李雄,段浩,龚兴宇,晏石林,余剑英.硅烷偶联剂修饰高岭土对沥青物理和老化性能的影响[J].材料科学与工艺,2023,31(5):24-30.DOI:10.11951/j.issn.1005-0299.20220237. |
| CHEN Liwei,LI Xiong,DUAN Hao,GONG Xingyu,YAN Shilin,YU Jianying.Effect of silane coupling agent modified kaolin on physical and aging properties of bitumen[J].Materials Science and Technology,2023,31(5):24-30.DOI:10.11951/j.issn.1005-0299.20220237. |
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| 摘要: |
| 为改善沥青的物理和老化性能,本文采用γ-(2,3环氧丙氧)丙基三甲氧基硅烷(KH560)对高岭土进行了表面修饰,通过熔融共混法分别制备了高岭土和表面修饰高岭土改性沥青,并对其进行了薄膜加热试验(TFOT)和压力老化容器试验(PAV),测试了高岭土和表面修饰高岭土改性沥青老化前后的物理性能,并利用傅里叶变换红外光谱(FTIR)和X射线衍射(XRD)对高岭土和表面修饰高岭土及其改性沥青老化前后的结构进行了表征。FTIR和XRD分析表明,KH560成功接枝到高岭土表面,但未改变高岭土的晶体结构。相比未修饰高岭土,表面修饰高岭土对沥青软化点和黏度的提高幅度更大,对沥青低温延度的不利影响减弱,TFOT和PAV老化对沥青性能的负面影响降低,并有效抑制了沥青老化后羰基指数的增加,显著改善了沥青的抗热氧老化性能。随着表面修饰高岭土掺量的增加,沥青物理性能和抗老化性能的提升越来越明显。 |
| 关键词: 沥青 高岭土 硅烷偶联剂 物理性能 老化 |
| DOI：10.11951/j.issn.1005-0299.20220237 |
| 分类号:U414 |
| 文献标识码:A |
| 基金项目:国家自然科学基金资助项目(51978546). |
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| Effect of silane coupling agent modified kaolin on physical and aging properties of bitumen |
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CHEN Liwei1,LI Xiong2,DUAN Hao1,GONG Xingyu2,YAN Shilin1,YU Jianying1
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(1.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China; 2.Keshun Waterproof Technology Co., Ltd., Foshan 528305, China)
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| Abstract: |
| In order to improve the physical properties and aging resistance of bitumen, kaolin was modified with γ-(2,3-epoxypropoxy) propyltrimethoxy silane (KH560) in this study. The kaolin and surface modified kaolin modified bitumen were prepared by melt blending method and subjected to thin film oven test (TFOT) and pressure aging vessel (PAV). The physical properties of the kaolin and surface modified kaolin modified bitumen before and after aging were measured, and Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to characterize the structure of kaolin, surface modified kaolin, and modified bitumen before and after aging. FTIR and XRD analysis showed that KH560 was successfully grafted onto the surface of kaolin, but the crystal structure was not changed. Compared with unmodified kaolin, the surface modified kaolin had a greater increase in the softening point and viscosity of bitumen, weakening the adverse effect on the ductility of bitumen. Besides, the negative influence of the properties of bitumen after TFOT and PAV aging was reduced, and the increase in carbonyl index after aging was effectively inhibited, implying that the thermal oxygen aging resistance of bitumen was significantly improved. With the increase in the content of surface modified kaolin, the physical properties and anti-aging properties of bitumen were enhanced noticeably. |
| Key words: bitumen kaolin silane coupling agent physical properties aging |
