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选取印刷线路板(简称PWBs)和覆铜板(简称CCL)两种典型电子废弃物代表,应用氧弹量热仪和热重分析仪分别对其进行高位定容弹筒发热量测试和热重分析。结果表明:对于PWBs,温度控制在250~520℃时,样品剩余质量随着升温速率的增加而增多,当温度超过520℃后趋势相反;CCL的分界温度在410℃附近。随着升温速率的提高,PWBs和CCL样品的最大失重速率会推迟出现10~20℃,且两种样品的DTG曲线均随着升温速率的提高整体向高温区偏移。反应初始温度、最终温度以及反应最大速率所对应的峰值温度均随着升温速率的增大而升高。当升温速率β增大时,PWBs和CCL样品的DTG峰值温度Tp值均升高;CCL样品的最大热解速率νmax变化趋势与Tp相同,但PWBs样品的νmax随升温速率变化不大。
Two kinds of typical electronic waste representatives, PWBs and CCL, were selected for the test. The calorific value of pyrolytic calorimeter and thermogravimetry . The results show that for PWBs, the residual mass of PWBs increases with the increase of heating rate when the temperature is controlled at 250-520 ℃. When the temperature exceeds 520 ℃, the trend is opposite. The boundary temperature of CCL is around 410 ℃. As the heating rate increased, the maximum weight loss rate of PWBs and CCL samples delayed 10-20 ℃, and the DTG curves of both samples shifted to the high temperature region as the heating rate increased. The initial temperature, the final temperature and the maximum temperature of the reaction corresponding to the peak temperature are as the heating rate increases. When the heating rate β was increased, the Tp values of DTG peak temperature of PWBs and CCL samples were all increased. The maximum pyrolysis rate νmax of CCL samples was the same as that of Tp, but the νmax of PWBs samples did not change much with the heating rate.