升温速率对油漆稀料和塑料共热解特性的影响

Effect of heating rate on the co-pyrolysis characteristics of paint thinners and plastics

为研究不同升温速率下油漆稀料与PET塑料共热解特性的变化规律,使用同步热分析仪,测定不同升温速率(10、20、30 K/min)条件下油漆稀料和PET塑料共热解过程中失重(TG)、焓变(DSC)的变化,并采用Coats-Redfern法对样品进行热动力学分析,探究油漆稀料和PET塑料两种材料的共热解行为受升温速率的影响。结果表明:在氮气气氛中,样品的热解过程存在明显的滞后现象;油漆稀料和PET塑料热解过程只存在1个主要失重阶段,混合物存在2个主要失重阶段;油漆稀料和PET塑料的热解活化能随着升温速率的提高而减小,混合物在升温速率低于30 K/min时热解反应受到抑制,在30 K/min升温速率下活化能最低,热解反应最彻底,最终样品残余量为8.4%,火灾危险性强。

To study the change of co-pyrolysis characteristics of paint thinner and PET plastic at different heating rates,a simultaneous thermal analyzer was used to measure the weight loss(TG)and enthalpy change(DSC)of paint thinner and PET plastic during co-pyrolysis at different heating rates(10,20,30 K/min).The Coats-Redfern method was used to analyze the thermal dynamics of the samples.The influence of heating rate on the co-pyrolysis behavior of paint thinner and PET plastic was investigated.The results show that the pyrolysis process of the sample has obvious hysteresis in nitrogen atmosphere.There is only one major weightlessness stage in the pyrolysis process of paint thinner and PET plastic,and there are two major weightlessness stages in the pyrolysis process of mixture.The pyrolysis activation energy of paint thinner and PET plastic decreaesproceed with the increase of heating rate.The pyrolysis reaction of the mixture is inhibited when the heating rate is lower than 30 K/min,and the pyrolysis reaction is the most complete when the heating rate is lower than 30 K/min.The final sample residual amount is 8.4%,and the fire risk is high.