聚四氟乙烯型印刷线路板的热解实验  

Experimental research on pyrolysis of polytetrafluoroethylene-printed circuit boards

作　　者：郭晓娟[1] 张于峰[1] 魏莉莉[1] 马洪亭[1] 

机构地区：[1]天津大学环境科学与工程学院,天津300072

出　　处：《华中科技大学学报（自然科学版）》2008年第10期121-124,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50378062);教育部科学技术研究重点项目(108030)

摘　　要：利用热重(TG)法进行了聚四氟乙烯(PTFE)型印刷线路板不同升温速率的热解特性实验研究,建立了表观热解反应动力学模型.利用固定床热解试验装置进行了PTFE线路板热解实验,利用气-质联用(GC-MS)和扫描电镜(SEM)分别检测了热解气体和固体产物.结果表明:a.所建热解模型与实验数据符合较好,求得动力学三参数分别为活化能223.606 kJ/mol,反应级数0,指前因子1.529×1013min-1;b.热解气体产物主要为八氟环丁烷.手动剥离即可实现金属和玻璃纤维等组分的分离富集,富集的金属片主要为铜片及其镀层上含有少量的金、镍等贵重金属;富集的玻璃纤维中含有大量的碳,还有一定量的O,F,Al,Si,Ca,Ti等元素.Pyrolysis characteristics of waste polytetrafluoroethylene（PTFE）-printed circuit boards were investigated under different heating rates with thermogravimetry （TG）. A kinetic model for expressing the pyrolysis reaction was established. A fixed-bed experimental apparatus was used to pyro lyze the printed circuit boards and the products were analysised by using gas chromatograph and mass spectrometer （GC-MS） and scanning electronic microscopy （SEM）. The results show： a. the kinetics model was in good agreement with the experimental ones at four heating rates, the kinetics parameters of polytetrafluoroethylene-type printed circuit boards was zero-order for reaction order, 223. 606 kJ/mol for the activation energy, 1. 529× 1013 min ^-1 for pre-exponential factor; b. octafluorocyclobutane was the main content of the pyrolysis gas. Glass fiber and metallic fractions were easily seperated and accumulated. The accumulated metals were mainly copper strip and a bit golden and nickel were plated on the strips. The enriched glassfibre consists of amount of carbon and significant concentra- tions of O,F,AI,Si,Ca,Ti.

关 键 词：印刷线路板 热解实验 聚四氟乙烯 反应动力学模型 分离富集 玻璃纤维 气-质联用 八氟环丁烷 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业] TN41[电子电信—微电子学与固体电子学]