High-Value and Environmentally Friendly Recycling Method for Coal-Based Solid Waste Based on Polyurethane Composite Materials

被引:0
|
作者
Li, Xu [1 ]
Liu, Yang [1 ]
Li, Mingyi [1 ]
Zhang, Sitong [1 ]
Jia, Lan [1 ,2 ]
Zhu, Fengbo [1 ,2 ]
Yu, Wenwen [1 ]
机构
[1] Taiyuan Univ Technol, Coll Mat Sci & Engn, Taiyuan 030024, Peoples R China
[2] Shanxi Zheda Inst Adv Mat & Chem Engn, Taiyuan 030000, Peoples R China
基金
中国国家自然科学基金;
关键词
composite materials; polyurethane; coal gangue; fly ash; INTUMESCENT FLAME-RETARDANT; SMOKE SUPPRESSION; FLY-ASH; FLAMMABILITY; COATINGS; FILLERS; GANGUE;
D O I
10.3390/polym16142044
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
This study aims to provide a high-value and environmentally friendly method for the application of coal-based solid waste. Modified fly ash/polyurethane (MFA/PU) and modified coal gangue powder/polyurethane (MCG/PU) composites were prepared by adding different contents of MFA and MCG (10%, 20%, 30%, 40%). At the filler content of 30%, the compressive strengths of MFA/PU and MCG/PU are 84.1 MPa and 46.3 MPa, respectively, likely due to an improvement in interface compatibility, as indicated by scanning electron microscopy (SEM). The MFA/PU and MCG/PU composites present their highest limiting oxygen index (LOI) values of 29% and 23.5%, respectively, when their filler content is 30%. MFA has advantages in improving the LOIs of composites. Cone calorimetry (CCT) and SEM demonstrate that the two composites exhibit similar condensed-phase flame-retardant behaviors during combustion, which releases CO2 in advance and accelerates the formation of a dense barrier layer. Compared with the MFA/PU composites, the MCG/PU composites could produce a more stable and dense barrier structure. Water quality tests show that heavy metals do not leak from FA and CG embedded in PU. This work provided a new strategy for the safe and high-value recycling of coal-based solid waste.
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页数:16
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