化工学报2025，Vol.76Issue(6)：2505-2523,19.DOI:10.11949/0438-1157.20241243
聚氨酯改性沥青高低温性能及影响因素的研究进展
Research progress on high and low temperature performance and influencing factors of polyurethane modified asphalt
摘要
Abstract
Polyurethane(PU)has received a lot of attention due to its high degree of freedom in performance adaptation.However,its diverse properties have led researchers to disagree on the effects of modifying the high and low temperature rheological properties of PU-modified asphalt.Therefore,it is crucial to gain a deeper understanding of the connection between different PU raw material properties,synthesis processes,product structures and the high and low temperature properties of modified asphalt.Based on the chemical modification mechanism of PU,combined with the molecular formation process and the performance evaluation criteria of polymer modified asphalt,this paper systematically explores the properties of different types of soft and hard segments and the structure of PU modifiers prepared by different synthesis methods on modified asphalt.It was shown that the degree of physical and chemical cross-linking of PU molecules within the asphalt is a key factor in the improvement of performance:the nature of the soft and hard segments and the molecular structure mainly affects the microstructural stability of the physical cross-linking,while the content of the isocyanate group directly determines the strength and complexity of the chemical cross-linking.The composite system of PU with polymers and other modifiers in asphalt was further analyzed for the modified mechanism.The addition of modifiers enhances the performance by changing the structural distribution of the internal components of asphalt with PU.However,it is difficult to accurately quantify the degree of cross-linking of PU through the microstructure in the current study,which restricts the precise tuning of the synthesis parameters and processes,which in turn leads to a low predictability of the modification effect.In addition,the structural instability of the composite system and the weak chemical interaction between modifiers often triggered the decrease of storage stability or the deterioration of certain properties.Finally,the development trend and outlook of the research on PU and its composite modified asphalt are proposed.关键词
聚氨酯/改性沥青/流变性能/聚合物/弹性体/复合材料/合成Key words
polyurethane/modified asphalt/rheological properties/polymers/elastomer/composites/synthesis分类
交通工程引用本文复制引用
郭乃胜,朱小波,王双,陈平,褚召阳,王志臣..聚氨酯改性沥青高低温性能及影响因素的研究进展[J].化工学报,2025,76(6):2505-2523,19.基金项目
大连市重点科技研发计划项目(2023YF22SN043) （2023YF22SN043）
黑龙江省自然科学基金项目(LH2023E026) （LH2023E026）
湖南省教育厅科学研究项目重点项目(24A0752) （24A0752）
湖南省教育厅科学研究项目优秀青年项目(24B1069) （24B1069）
