钢轨绝缘修补密封胶的研究  

Study on sealant for rail insulation repair

作　　者：赵喜桢 张继承 ZHAO Xizhen;ZHANG Jicheng(School of Materials Science and Engineering, Xi'an University of Architecture and Technology,Xi'an 710055, China;Xi'an SiyuanKechuang Rail Transit Technology Development Co., Ltd., Xi'an 710054, China;High-speed Rail Infrastructure Segment of China Railway Xi 'anBureau Group Co., Ltd.,Xi'an 710000, China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055 [2]西安思源科创轨道交通技术开发有限公司,西安710054 [3]中国铁路西安局集团有限公司高铁基础设施段,西安710000

出　　处：《功能材料》2020年第6期6108-6113,共6页Journal of Functional Materials

基　　金：中央高校基本科研业务费专项资金资助项目(xtr0118008,xzy012019001);中国铁路西安局集团有限公司科研计划资助项目(2019GH202)。

摘　　要：为解决铁路部门列车通过钢轨轨缝绝缘产生震动而造成吸附于轮对的铁屑落入轨缝导致钢轨绝缘失效的问题,以硅烷改性聚氨酯预聚体为基胶,纳米碳酸钙和气相法白炭黑复配作为补强填料,通过研究基胶、填料、增塑剂、脱烃剂、偶联剂、催化剂的用量对胶体性能的影响,优化了胶体配方并成功制备了一种快速固化的硅烷改性聚氨酯预聚体绝缘密封胶。最佳配方是:100份硅烷改性聚氨酯预聚体,200份纳米碳酸钙,20份气相法白炭黑,60份PPG2000,3份A-171,3份A-1120,1份有机锡催化剂、1份抗氧化剂,40份稀释剂。经过测试,胶体在25℃环境下,表干时间5 min,试件的拉伸强度为2.6 MPa,拉断伸缩率为379%,成胶后胶膜致密均匀,具有良好的热稳定性和耐候性,满足钢轨轨缝绝缘修补的各项技术要求。In order to solve the problem of rail insulation failure caused by the iron scraps adsorbed on the wheel set falling into the rail gap when the train passing through the rail gap insulation causes vibrate,taking the silane-modified polyurethane pre-polymers as base gum and the gas phase method of white carbon black compound nanometer calcium carbonate as a reinforcing filler,by studying the base glue,packing,plasticizer,hydrocarbon remover,coupling agent and the dosage of catalyst on the properties of gel,gel formula was optimized and the preparation of a kind of fast curing silane-modified polyurethane pre-polymers insulating sealant.The best formula was:100 parts silane-modified polyurethane pre-polymer,200 parts nanometer calcium carbonate,20 parts vapor phase silica,60 parts PPG2000,3 parts A-171,3 parts A-1120,1 part organo-tin catalyst,1 part antioxidant,and 40 parts diluent.After testing,under 25℃,the surface dry time was 5 minutes,the tensile strength of the test piece was 2.6 MPa and the tensile expansion rate was 379%.The film was dense and uniform after gluing,with good thermal stability and weatherability,which metthe technical requirements of rail gap insulation repair.

关 键 词：钢轨绝缘 硅烷改性聚氨酯预聚体 快速固化 绝缘密封 

分 类 号：TB33[一般工业技术—材料科学与工程]