动态二硫键自修复聚氨酯改性沥青的制备和性能  

Preparation and Properties of Dynamic Disulfide Bond Self-healing Polyurethane Modified Asphalt

作　　者：李璐 张贤明[1] 郝增恒 LI Lu;ZHANG Xianming;HAO Zengheng(Engineering Research Center for Waste Oil Recovery Technology and Equipment,Ministry of Education,Chongqing Technology and Business University,Chongqing 400067,China;College of Architecture and Engineering,Chongqing Water Resources and Electric Engineering College,Chongqing 402160,China;Chongqing Zhixiang Paving Technology Engineering Co.,Ltd.,Chongqing 401336,China)

机构地区：[1]重庆工商大学废油资源化技术与装备教育部工程研究中心,重庆400067 [2]重庆水利电力职业技术学院建筑工程学院,重庆402160 [3]重庆市智翔铺道技术工程有限公司,重庆401336

出　　处：《建筑材料学报》2024年第6期514-519,共6页Journal of Building Materials

基　　金：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)。

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.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.

关 键 词：动态二硫键 改性沥青 自修复 聚氨酯 

分 类 号：TU502[建筑科学—建筑技术科学]