Evalution of Thermal Oxidative Degradation of Trimethylol-propane Trioleate by TG/DTA/DSC  

作　　者：ZHAN Wen DUAN Haitao LI Xinxiang LI Jian YUAN Chengqing 占稳;DUAN Haitao;LI Xinxiang;LI Jian;YUAN Chengqing(Wuhan Research Institute of Materials Protection,China Academy of Machinery Science and Technology,Wuhan 430030,China;School of Energy and Power Engineering,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]Wuhan Research Institute of Materials Protection,China Academy of Machinery Science and Technology,Wuhan 430030,China [2]School of Energy and Power Engineering,Wuhan University of Technology,Wuhan 430063,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2021年第2期280-288,共9页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(52075391);the China Postdoctoral Science Foundation(2019M660596)。

摘　　要：In order to evaluate the thermal oxidation degradation behavior of lubricant with different antioxidants,the thermal kinetics equation based on the anlyses of thermogravimetry(TG),differential thermal analysis(DTA),and differential scanning calorimetry(DSC)was established,respectively,to calculate the activation energy of lubricant thermal-oxidative reaction.The thermal analyses of TG and DTA were employed to determine the thermal decomposition properties of ester oils trimethylolpropane trioleate(TMPTO)with butyl-octyl-diphenylamine/octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate/amine-phenol combination antioxidant.The activation energy of the lubricating oil adding antioxidant is increased relative to the TMPTO base oil,and the order of activation energy are Ec(93.732 kJ·mol^(-1))>Ed(88.71 kJ·mol^(-1))>Eb(58.41 kJ·mol^(-1))>Ea(46.32 kJ·mol^(-1)).The experimental results show that octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate in TMPTO has favorable resistance to thermal oxidation and decomposition.The thermal analysis method of DSC accurately reflects the heat exchange of lubricant thermal-oxidative reaction.The order of activation energy is calculated to ED(144.385 kJ·mol^(-1))>EC(110.05 kJ·mol^(-1))>EB(97.187 kJ·mol^(-1))>EA(66.02 kJ·mol^(-1)).It is illustrated that the amine-phenol combination antioxidant has the best thermal oxidation resistance,which is the same as what the oxidation onset temperature effected.

关 键 词：thermal oxidative degradation thermal kinetics ANTIOXIDANTS trimethylolpropane oleate 

分 类 号：TH117.22[机械工程—机械设计及理论]