玻纤PP和PU弹性体热解动力学分析与热老化寿命评估  

Pyrolysis Kinetics Analysis and Thermal Aging Life Evaluation of Glass Fiber PP and PU Elastomer

作　　者：侯芳 袁树杰[1] HOU Fang;YUAN Shu-jie(School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学安全科学与工程学院,安徽淮南232001

出　　处：《塑料科技》2023年第9期12-16,共5页Plastics Science and Technology

摘　　要：通过热重分析研究玻纤聚丙烯(PP)和聚氨酯(PU)弹性体两种汽车内饰材料在10、20和30℃/min升温速率下的热解过程,建立两种材料在30℃/min升温速率下的热寿命方程,计算出在特定温度下的使用寿命。采用Coats-Redfern(CR)方法分析热失重曲线,确定玻纤PP和PU弹性体在每个热失重阶段的最佳反应级数。结果表明:玻纤PP只存在一个热失重阶段,最佳反应级数为0.5;而PU弹性体存在两个热失重阶段,其中第一热失重阶段的最佳反应级数为2.0,而第二热失重阶段的最佳反应级数为0.1。将最佳反应级数下材料的活化能与ASTM中提供的热寿命方程相结合,建立了材料在10%失重率下的热寿命方程。比较这两种材料在温度为20、30和40℃下的使用寿命,得出PU弹性体的热寿命远小于玻纤PP。The pyrolysis process of glass fiber polypropylene(PP)and polyurethane(PU)elastomers at 10,20 and 30℃/min heating rates was studied by thermogravimetric analysis.The thermal life equations of the two materials at 30℃/min heating rate were established,and the service life at a specific temperature was calculated.The thermogravimetric curves were analyzed by Coats-Redfern(CR)method to determine the optimal reaction order of glass fiber PP and PU elastomers in each thermogravimetric stage.The results show that there is only one thermogravimetric stage in glass fiber PP,and the optimal reaction order is 0.5.The PU elastomer has two thermogravimetric stages,the best reaction order of the first thermogravimetric stage is 2.0,and the best reaction order of the second thermogravimetric stage is 0.1.Combining the activation energy of the material under the optimal reaction order with the thermal life equation provided in ASTM,the thermal life equation of the material at 10%weight loss rate was established.Comparing the service life of these two materials at temperatures of 20,30 and 40℃,it is concluded that the thermal life of PU elastomer is much smaller than that of glass fiber PP.

关 键 词：玻纤聚丙烯 聚氨酯 热解特性 动力学参数 最佳反应级数 热老化寿命评估 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业] TQ323.8