不干胶废弃物热重分析  

Thermogravimetric analysis of pressure-sensitive adhesives wastes

作　　者：徐国欢 付兴民[1] 贾晋炜[1] 鲁明元 舒新前[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《环境工程学报》2015年第5期2437-2442,共6页Chinese Journal of Environmental Engineering

基　　金：山西省科技攻关计划项目(20130313008-1)

摘　　要：为了探索不干胶类包装废弃物的热解特性,采用热重分析手段分析了不同升温速率条件下不干胶类废弃物的失重特点,并且采用Ozawa法和KAS法比较分析不同转化率条件下的表观活化能分布。热重分析结果表明,不干胶类废弃物的热解主要分为3个阶段:第1阶段(室温~200℃)为不干胶类废弃物的干燥阶段,第2阶段(200~590℃)为热解的主要阶段,第3阶段(590~800℃)为热解半焦的深度热解阶段。升温速率对热解失重率有重要影响,Ozawa法和KAS法计算结果表明,2种方法计算的热解活化能比较接近,Ozawa法得到的活化能为349.9 k J/mol,KAS法得到的活化能为336.9k J/mol;并且不干胶类废弃物的热解表观活化能呈现出阶段性分布。The pyrolysis kinetics characteristics of pressure-sensitive adhesives( PSA) were investigated using thermo gravimetric analysis( TGA),we studied the process of weight loss during the thermal degradation at different heating rates by means of thermal balance. Moreover,the distribution of apparent activation energy(Ea) at different conversion ratios was also calculated by Ozawa and KAS methods,respectively. The results shows that the process of pyrolysis of PSA wastes could be divided into three stages: the first stage for the temperatures below 200℃ was the dehydration of the PSA materials; the second stage(200 ~ 590℃) was the main process of the PSA wastes pyrolysis; the third stage(590 ~ 800℃) was the depth degradation of char. The weight loss rate was greatly influenced by the heating rate. The Ea calculated by Ozawa and KAS methods were very close,the average Ea by Ozawa method was 349. 9 k J / mol,however,336. 9 k J / mol by KAS method. The distribution of Ea at different conversion ratios presented a staggered distribution.

关 键 词：不干胶废弃物 热重分析 动力学 活化能 

分 类 号：X796[环境科学与工程—环境工程]