热解气氛对油漆稀料和塑料共热解特性的影响

为研究不同热解气氛对油漆稀料与聚对苯二甲酸乙二醇酯（PET）共热解特性的变化规律，采用同步热分析仪，根据预实验结果，测定在升温速率为10 ℃/min时，不同热解气氛（空气和氮气）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。结果表明，样品在氮气气氛下的热解过程存在明显的滞后现象，质量损失率为82.2 %；在空气气氛中更有利于油漆稀料和PET塑料的共热解反应中间产物的检出；PET塑料及其燃烧残留物在空气中的平均活化能均小于氮气中的值，但混合物在空气中400~475 ℃温度间活化能更低；500 ℃后混合物达到二次燃烧条件。

Effect of Pyrolysis Atmosphere on Co⁃pyrolysis Characteristics of Paint Thinners and Plastics

To explore the change of co?pyrolysis characteristics of paint thinner and plastics under different pyrolysis atmosphere. According to the pre?experiment results， the variations of mass loss in TG and enthalpy in DSC during the co?pyrolysis of paint thinner and plastics were measured under different pyrolysis atmosphere （air and nitrogen） at a heating rate of 10 ℃/min using a synchronous thermal analyzer. The thermal dynamics of the samples were analyzed using a Coats?Redfern method. The results indicated that the pyrolysis process of the sample in nitrogen atmosphere showed an obvious lag phenomenon， and its mass loss rate was as low as 82.2 wt %. The air atmosphere was more advantageous to the detection of paint thinner and PET plastic co?pyrolysis reaction intermediate products. The average activation energy of PET plastic and its combustion residues in the air was lower than that in nitrogen. However， the activation energy of the mixture in the air was lower at 400~475 ℃. The mixture reached a secondary combustion condition at 500 ℃.