Abstract: 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.

Key words: thermal dynamics, co-pyrolysis, heating rate, paint thinner, Coats-Redfern