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

doi:10.19491/j.issn.1001-9278.2021.11.005

Abstract

Abstract:

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 ℃.

Key words: pyrolysis atmosphere, paint thinner, plastics, co?pyrolysis, thermal dynamic

CLC Number:

TQ 323.4⁺1

HE Fenfen, LIN Qingwen, LIU Ling, YUE Hailing. Effect of Pyrolysis Atmosphere on Co⁃pyrolysis Characteristics of Paint Thinners and Plastics[J]. China Plastics, 2021, 35(11): 32-37.

Figures/Tables 8

Fig.1. TG curves of mixed samples at different heating rates in air atmosphere

Fig.2. TG curves of PET powder in different atmospheres at a heating rate of 10 ℃/min

Fig.3. DSC curves of PET powder in different atmospheres at a heating rate of 10 ℃/min

Fig.4. TG curves of the mixture in different atmospheres at a heating rate of 10 ℃/min

Fig.5. DSC curves of the mixture in different atmospheres at a heating rate of 10 ℃/min

Fig.6. Comparison curves of different reaction series of PET powder in different atmosphere at a heating rate of 10 ℃/min

Fig.7. Contrast curves of different reaction series of mixtures in different atmospheres at a heating rate of 10 ℃/min

样品	气氛环境	n	T_A?B/℃	拟合直线	R2	E/kJ?mol^?1
PET粉末	Air	1	400~500	y=0.835x?13.972	0.996 44	7.276
PET粉末	N₂	2	400~500	y=?10.100x+10.548	0.992 43	88.011
混合物	Air	0.25	25~100	y=0.151x?10.576	0.991 05	1.316
		0.25	400~475	y=0.854x?13.846	0.995 8	7.442
		0.25	500~675	y=0.773x?13.662	0.992 36	6.732
	N₂	0.1	25~100	y=0.092x?9.669	0.993 93	7.468
	N₂	0.1	400~475	y=0.857x?14.026	0.998 15	0.797

Tab.1. Pyrolysis kinetic parameters of samples in different atmospheres at a heating rate of 10 ℃/min

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