摘要
采用TG（热重分析仪）和自制小尺度管式炉热解试验台架装置分别探讨了电子废弃物FR4环氧树脂玻璃纤维覆铜板在纯N2气氛中,以10 K/min升温速率加热到800℃的热解特性及在不同热解终温、停留时间下的固体残余物质量分布规律;采用SEM（扫描电子显微镜）分别对2种热解终温（450℃、550℃）下热解后玻璃纤维布进行微观形貌表征。TG热解结果表明,试样在N2气氛下热分解反应主要集中在第1阶段（300～400℃）,失重量占总失重量65.55%,500℃后热解残余率趋于不变;管式炉热解结果及残余物表观微观形貌表明,热解温度和停留时间对玻璃纤维析出产率影响较大,而对铜析出产率几乎没有影响。当热解温度为550℃且停留时间保持10min时,废弃FR4环氧树脂玻璃纤维覆铜板可充分热解,玻璃纤维层间的环氧树脂系胶结剂已分解完毕,热解残余率达到最低值且玻璃纤维布自身未见明显变化。研究表明,通过热解焚烧技术电子废弃物资源具有规模化再利用的可能性。
The paper is inclined to introduce an exploration of the pyrolysis properties of the waste FR4 epoxy resin copper clad panels and the precipitation-yielding distribution regularity of its solid residues in pure N2 at the same heating rate of 10 K / min. At the same time,we have also made an observation of the different ending pyrolysis temperatures（ 350 ℃,400 ℃,450 ℃,480 ℃,500 ℃,530 ℃,550 ℃,580 ℃,600 ℃,700 ℃,800 ℃）and residence time（ 1 min,3 min,5 min,10 min,15 min,20 min,25 min,30 min） by using a thermo-gravimetric analyzer and a self-made testing rig for the purpose. We have also analyzed the microscopic morphologies of the glass-fiber after the pyrolysis with ending temperatures being about 450 ℃ and 550 ℃by scanning electron microscope（ SEM）. The TG pyrolysis results indicate that the primary pyrolysis process tends to come about at the first stage with the temperatures to be raised between300 ℃ and 400 ℃ at about a loss percentage of 67. 45% of the total weight whereas the residual solid content rates may turn to be kept stable at the temperature of above 500 ℃. Furthermore,the tube furnace and SEM test results also prove that the ending pyrolysis temperature and the residence time are potentially giving remarkable effects on the precipitation yielding rates of the glass fiber but much less effect on those of copper. In addition,we have also found that,under the pyrolysis temperature of 550 ℃and the residence time of 10 minutes,the epoxy resin adhesive between the glass-fiber layers would likely to be totally pyrolyzed,which implies the minimum residual solid content,and little morphological and dimensional changes. Thus,it can be seen that the above basic data with the testing exploration we have done tend to reflect the promising prospect of the recovering and utilizing electronic wastes in a greater scale.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2016年第5期265-269,共5页
Journal of Safety and Environment
基金
国家自然科学基金项目(51376089)
江苏省环保厅重点环保科研课题(201116)
江苏高校优势学科建设工程项目(公共安全与节能)
关键词
环境工程学
环氧树脂
覆铜板
固体残余物
热解特性
微观形貌
电子废弃物
environmental engineering
epoxy resin
copper clad panel
solid residue
pyrolysis property
microscopic morphology
electrical waste
