| 摘要: |
| 为提高沥青路面的长期抗开裂性，开发了一种基于动态二硫键自修复聚氨酯改性沥青.以胱胺二盐酸盐为原料合成了含二硫键的聚氨酯扩链剂（CY-OA），再通过分步共聚合成了二硫键交联聚氨酯弹性体（PU-SS），并与沥青混合得到自修复聚氨酯改性沥青（PSA），研究了PU-SS和PSA的物理化学性能、微观形态和自修复性能.结果表明，PU-SS的掺入提高了沥青的低温抗变形能力，其动态二硫键的自修复机制促进了沥青固有的自修复能力，实现了协同修复. |
| 关键词: 动态二硫键 改性沥青 自修复 聚氨酯 |
| DOI：10.3969/j.issn.1007-9629.2024.06.005 |
| 分类号:TU502 |
| 基金项目:重庆市教委科学技术研究计划项目（KJZD-K202303802）； 重庆市永川区自然科学基金资助项目（2023yc-jckx20078） |
|
| Preparation and Properties of Dynamic Disulfide Bond Self-healing Polyurethane Modified Asphalt |
|
LI Lu1,2,3, ZHANG Xianming1, HAO Zengheng3
|
|
1.Engineering Research Center for Waste Oil Recovery Technology and Equipment， Ministry of Education， Chongqing Technology and Business University， Chongqing 400067， China;2.College of Architecture and Engineering， Chongqing Water Resources and Electric Engineering College， Chongqing 402160， China;3.Chongqing Zhixiang Paving Technology Engineering Co.， Ltd.， Chongqing 401336， China
|
| Abstract: |
| In order to enhance the long-term resistance to cracking of asphalt pavement， a self-healing polyurethane modified asphalt based on dynamic disulfide bonds was developed. Polyurethane chain extender containing disulfide bonds （CY-OA） was synthesized using cystamine dihydrochloride as raw material， and disulfide bond-crosslinked polyurethane elastomer （PU-SS） was synthesized through stepwise copolymerization. PU-SS was mixed with asphalt to obtain self-healing polyurethane modified asphalt （PSA）. The physical and chemical properties， microscopic morphologies， and self-healing properties of PU-SS and PSA were studied. The results show that the addition of PU-SS improves the low-temperature deformation resistance of asphalt. The dynamic disulfide bond self-healing mechanism of PU-SS promotes the inherent self-healing ability of asphalt， achieving synergistic repair. |
| Key words: dynamic disulfide bond modified asphalt self-healing polyurethane |
