摘要
基于等体积混合喷涂要求,对高早强、易捣固破坏的有砟道床聚氨酯表面胶结材料进行研究。性能测试结果显示:MDI100与220制备的预聚物粘度低,所制产品的综合性能最佳;合理控制PAPI掺量,可有效改善材料的工作性能和力学性能;聚醚多元醇330N与819复配效果优、憎水效果好,产品兼具良好的力学强度与柔顺性;液体高活性扩链交联剂T-41所制产品的早期力学强度和粘结强度满足天窗期施工要求,对水不敏感;R值在1.05~1.35时,产品性能稳定;断裂伸长率是胶结道床可捣固性优劣的决定性指标,为便于捣固维修,产品断裂伸长率宜为10%~35%。研制的聚氨酯表面胶结材料服役寿命长,可有效解决道砟飞溅问题,不影响道床正常养护维修。
Based on the requirement of equal volume mixing spraying,the polyurethane surface cementing material with high early strength and easy tamping failure was studied in this thesis.The results of performance test show that the prepolymers prepared by MDI100 and 220 have low viscosity and produce products of a best overall performance;Appropriate control of the PAPI content can improve the work performance and mechanical properties of the material;combing polyether polyol 330N and 819 can lead to excellent results on hydrophobic effect,mechanical strength,and flexibility;the early mechanical strength and bonding strength of the product made by the liquid high-activity chain-extending crosslinking agent T-41 meet the requirements of the construction during the maintenance window,and the producs are water Insensitive;the product performance is stable as the value of R is between 1.05 and 1.35;the elongation at break is a determinant indicator of the tamping performance of the cemented ballast bed.To facilitate tamping and maintenance,the elongation at break should be 10%~35%.The long service life of polyurethane surface cementing material can solve the problem of ballast splashing without affecting the normal maintenance of the track bed.
作者
靳昊
罗慧刚
易忠来
董延东
李化建
梁雪江
JIN Hao;LUO Huigang;YI Zhonglai;DONG Yandong;LI Huajian;LIANG Xuejiang(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Yuanping Branch,Shuohuang Railway Development Co Ltd,Yuanping Shanxi 034100,China;Track Department,China Railway Beijing Group Co Ltd,Beijing 100860,China)
出处
《中国铁路》
2020年第10期94-98,共5页
China Railway
基金
中国铁路总公司科技研究开发计划项目(2015G002-J)。
关键词
工程材料
表面胶结材料
有砟道床
聚氨酯
性能测试
engineering materials
surface Adhesives
ballast bed
polyurethane
performance test
