Low-temperature characteristicsof rubbers and performance testsof type 120 emergencyvalve diaphragms  

作　　者：Ming Gao Anhui Pan Yi Huang Jiaqi Wang Yan Zhang Xiao Xie Huanre Han Yinghua Jia 

机构地区：[1]Metals and Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing,China [2]Department of Locomotive and Car,China State Railway Group Company Limited,Beijing,China [3]Quality and Technical Supervision Institute,China Railway Harbin Bureau Group Company Limited,Harbin,China

出　　处：《Railway Sciences》2024年第1期47-58,共12页铁道科学（英文）

基　　金：funded by the Science and Technology Research and Development Plan of the China State Railway Group Company Limited(No.N2023J053).

摘　　要：Purpose–The type 120 emergency valve is an essential braking component of railway freight trains,butcorresponding diaphragms consisting of natural rubber(NR)and chloroprene rubber(CR)exhibit insufficientaging resistance and low-temperature resistance,respectively.In order to develop type 120 emergency valverubber diaphragms with long-life and high-performance,low-temperatureresistant CR and NR were processed.Design/methodology/approach–The physical properties of the low-temperature-resistant CR and NRwere tested by low-temperature stretching,dynamic mechanical analysis,differential scanning calorimetryand thermogravimetric analysis.Single-valve and single-vehicle tests of type 120 emergency valves werecarried out for emergency diaphragms consisting of NR and CR.Findings–The low-temperature-resistant CR and NR exhibited excellent physical properties.The elasticityand low-temperature resistance of NR were superior to those of CR,whereas the mechanical properties of thetwo rubbers were similar in the temperature range of 0℃–150℃.The NR and CR emergency diaphragms metthe requirements of the single-valve test.In the low-temperature single-vehicle test,only the low-temperaturesensitivity test of the NR emergency diaphragm met the requirements.Originality/value–The innovation of this study is that it provides valuable data and experience for futuredevelopment of type 120 valve rubber diaphragms.

关 键 词：Natural rubber Chloroprene rubber Low-temperature characteristic 120 emergency valve DIAPHRAGM 

分 类 号：U21[交通运输工程—道路与铁道工程]