摘要
为了探究环保型聚氨酯(EPU)在改性沥青中的适用性,以聚碳酸酯二醇(PCDL)为软段,二苯基甲烷二异氰酸酯(MDI)和丁二醇(BDO)为硬段通过原位聚合法制备EPU改性沥青。红外光谱分析用于分析EPU改性沥青的化学结构;针入度、软化点、延度和黏度用来评价所制备改性沥青的物理性能;以软化点差来评价改性沥青的相容性;动态剪切流变试验用来探究改性沥青的高温流变性能;差示扫描量热试验及弯曲流变仪试验被用来探究改性沥青在低温下的蠕变机理。结果表明EPU分子在沥青中会与沥青分子反应生成交联结构,EPU的加入能有效提高沥青的物理性能及高温性能,且相容性较好。EPU具有更低的玻璃化转变温度,因此EPU对沥青的低温性能也表现出优异的提升效果。研究能为生产EPU改性沥青提供新的思路。
In order to explore the applicability of environment-friendly polyurethane(EPU)in modified asphalt,the EPU modified asphalt was prepared by in-situ polymerization with polycarbonate diol(PCDL)as the soft segment and diphenylmethane diisocyanate(MDI)and butanediol(BDO)as the hard segment.FTIR test was used to analyze the chemical composition of EPU modified asphalt.The penetration,softening point,ductility,and viscosity were used to evaluate the physical properties of the modified asphalt.The compatibility of modified asphalt was evaluated by softening point difference.Dynamic shear rheological test was used to investigate the high temperature rheological properties of modified asphalt.Differential scanning calorimetry and bending rheometer experiments were used to investigate the creep mechanism of modified asphalt at low temperature.The results show that EPU molecules react with asphalt molecules in asphalt to form transaction structures.The addition of EPU can effectively improve the physical properties and high temperature properties of asphalt,and the compatibility is good.EPU has a lower glass transition temperature,so EPU also shows excellent improvement effect on the low-temperature performance of asphalt.This study can provide a new idea for the production of EPU modified asphalt.
作者
俞颖皓
YU Ying-hao(CURG Ecological and Environmental Protection Engineering Co.,Ltd.,Wuhan,Hubei 430000,China)
出处
《中国港湾建设》
2024年第1期73-78,84,共7页
China Harbour Engineering
关键词
道路工程
环保型聚氨酯
改性沥青
高温性能
低温性能
road engineering
environment-friendly polyurethane
modified asphalt
high temperature performance
low temperature performance
