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44. Thermoplastic polyurethane composites based on iron tailings: An effective strategy for industrial solid waste utilization.

Author

Liu, Xinliang, Yang, Sujie, Zhou, Xiangyu, Liu, Chunlin, Liu, Mengru, Tang, Gang, Kan, Yongchun, Deng, Dan, and Wen, Panyue

Subjects
WASTE recycling, INDUSTRIAL wastes, SOLID waste, THERMOPLASTIC composites, IRON composites
Abstract

The massive production and accumulation of industrial solid waste-iron tailings not only occupy valuable land resources but also easily cause environmental pollution and personnel injury. Based on this, the thermoplastic polyurethane (TPU)/modified iron tailings (MIT) composites were prepared by surface modification of iron tailings (MIT) and adding it as flame retardant to TPU. The combustion performance and smoke toxicity of TPU/MIT composites were analyzed by thermogravimetric analysis (TG), thermogravimetric-spectroscopy (TG-IR) and cone calorimetry (CCT). The morphology and structure of the carbon slag of the composites were analyzed by scanning electron microscopy(SEM) and Raman spectroscopy. The results showed that the initial thermal decomposition temperature (T-5%) of TPU/MIT30 composite increased at about 7oC, and the residual carbon content at 700oC increased from 3.13 wt% to 32.17 wt%. The peak heat release rate(PHRR), total heat release(THR) and total smoke release(TSR) of TPU/MIT30 composite decreased from 800.6 kW/m2, 83.1 MJ/m2 and 827.6 m2/m2 of pure TPU to 488.0 kW/m2, 63.6 MJ/m2 and 517.4 m2/m2, respectively. The SEM and Raman1 spectroscopy of char residue showed that the compactness and graphitization degree of char residue for TPU/MIT30 composite was the highest, indicating that the MIT could effectively improve the fire safety of TPU composites. This study provided some ideas for the high-value utilization of iron tailings. [ABSTRACT FROM AUTHOR]

Published
2023
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50. Metallurgical solid waste modified thermoplastic polyurethane composites: The thermal stability and combustion properties.

Author

Yang, Sujie, Liu, Xinliang, Tao, Yi, Deng, Dan, Kan, Yongchun, Du, Xiaoyan, Liu, Xiuyu, and Tang, Gang

Subjects
SOLID waste, METAL wastes, THERMOPLASTIC composites, WASTE recycling, INDUSTRIAL wastes, IRON compounds, INCINERATION
Abstract

As a kind of bulk industrial solid waste, the massive accumulation of iron tailings has caused serious waste of resources and environmental pollution. In this study, a silane coupling agent (KH550) was used to modify the surface of iron tailings to produce MIT, and it was compounded with ammonium polyphosphate (APP) on thermoplastic polyurethane (TPU) to prepare a series of TPU/APP/MIT composites. Thermogravimetric (TG), cone calorimetric (CCT), thermogravimetric infrared, scanning electron microscopy, and Raman techniques were also used to analyze the combustion performance, smoke toxicity, and microscopic morphology. The TG test results showed that the compounding of APP and MIT significantly improved the residual carbon value of TPU composites at 700°C. CCT test results showed that the TPU/APP/MIT composites exhibited excellent flame retardancy and smoke suppression. Compared with pure TPU, PHRR, THR, and TSR of TPU/APP15/MIT10 composite decreased by 85.56%, 87.83%, and 86.17%, respectively, the peak release rates of CO and CO2 decreased by 69.26% and 90.34%, respectively. The above studies showed that APP and MIT have excellent flame retardant and smoke suppression effect on TPU materials, providing more opportunities for the study of TPU composites and metallurgical solid waste utilization. [ABSTRACT FROM AUTHOR]

Published
2023
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