Chemical degradation of polyurethane coating waste and its resource utilization

doi:10.19491/j.issn.1001-9278.2024.03.014

Abstract

Abstract:

The polyurethane coating waste was chemically degraded using mono⁃diethylene glycol （DEG） as an alcohololytic agent to recover low molecular weight polyol， and the recovered polyol was mixed with commercial polyol as a raw material to prepare recycled polyurethane foam. The optimum parameters were determined as follows： reaction reagent ratio of 1∶2， reactiontemperature of 180 ℃， reaction time of 2 h， catalyst addition of 1.3 %， under which the extraction rate of the alcoholysis product was 36.8 %， hydroxyl value of 384.6 mgKOH/g， and viscosity of 476 mPa·s. The results were obtained by Fourier transform infrared spectroscopy， gel permeation chromatography， thermogravimetric analysis， and scanning electron microscopy. The recovered polyol and recycled polyurethane foam were characterized and analyzed by FTIR， GPC， TG and SEM. The results showed that the recovered polyol and polyether polyol were consistent in molecular structure and met the performance requirements for the preparation of polyurethane foam. When the recycled polyol was mixed with the commercial polyol， and the proportion of recycled polyol in the total polyol was 33 %， the prepared polyurethane had good pore structure and thermal stability.

Key words: polyurethane, coating, alcoholysis, polyol, recycling, regeneration

CLC Number:

TQ323.8

LI Guohua, FANG Xuezhen, SHEN Zhu, ZHANG Xinyu, WANG Jingxian. Chemical degradation of polyurethane coating waste and its resource utilization[J]. China Plastics, 2024, 38(3): 79-85.

Figures/Tables 11

References 14

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氧化物成分	质量占比/%	标准偏差	元素成分	质量占比/%	标准偏差
SiO₂	14.68	0.20	Si	6.68	0.09
TiO₂	10.09	0.18	Ti	6.05	0.10
MgO	9.93	0.16	Mg	5.99	0.09
CaO	3.31	0.09	Ca	2.37	0.07
SO₃	1.75	0.07	Sx	0.699	0.026
Al₂O₃	0.697	0.035	Al	0.389	0.018
ZnO	0.359	0.018	Zn	0.208	0.014
Fe₂O₃	0.297	0.005	Fe	0.266	0.010
ZnO	0.148	0.007	Zn	0.183	0.0032

氧化物成分	质量占比/%	标准偏差	元素成分	质量占比/%	标准偏差
SiO₂	14.68	0.20	Si	6.68	0.09
TiO₂	10.09	0.18	Ti	6.05	0.10
MgO	9.93	0.16	Mg	5.99	0.09
CaO	3.31	0.09	Ca	2.37	0.07
SO₃	1.75	0.07	Sx	0.699	0.026
Al₂O₃	0.697	0.035	Al	0.389	0.018
ZnO	0.359	0.018	Zn	0.208	0.014
Fe₂O₃	0.297	0.005	Fe	0.266	0.010
ZnO	0.148	0.007	Zn	0.183	0.0032

氧化物成分	质量占比/%	标准偏差	元素成分	质量占比/%	标准偏差
SiO₂	44.35	0.25	Si	20.73	0.12
MgO	28.80	0.23	Mg	17.37	0.14
TiO₂	11.36	0.16	Ti	6.81	0.10
CaO	8.49	0.14	Ca	6.07	0.10
SO₃	4.35	0.10	Sx	1.74	0.04
Al₂O₃	1.10	0.05	Al	0.580	0.028
Fe₂O₃	0.731	0.036	Fe	0.511	0.025
SnO₂	0.337	0.017	Sn	0.266	0.013
ZnO	0.228	0.011	Zn	0.183	0.009

氧化物成分	质量占比/%	标准偏差	元素成分	质量占比/%	标准偏差
SiO₂	44.35	0.25	Si	20.73	0.12
MgO	28.80	0.23	Mg	17.37	0.14
TiO₂	11.36	0.16	Ti	6.81	0.10
CaO	8.49	0.14	Ca	6.07	0.10
SO₃	4.35	0.10	Sx	1.74	0.04
Al₂O₃	1.10	0.05	Al	0.580	0.028
Fe₂O₃	0.731	0.036	Fe	0.511	0.025
SnO₂	0.337	0.017	Sn	0.266	0.013
ZnO	0.228	0.011	Zn	0.183	0.009

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