1. Steel slag waste combined with melamine pyrophosphate as a flame retardant for rigid polyurethane foams.
- Author
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Tang, Gang, Liu, Xinliang, Zhou, Lin, Zhang, Ping, Deng, Dan, and Jiang, Haohao
- Subjects
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FIRE resistant polymers , *STEEL wastes , *URETHANE foam , *FIREPROOFING agents , *HEAT release rates , *INDUSTRIAL wastes - Abstract
• Steel slag was used as co-flame retardants for rigid polyurethane foams (RPUFs). • The PHRR value of RPUF-2 reduced by 47% compared to that of original RPUF. • The presence of steel slag improved the thermal resistance of intermediates in TGA. • The addition of steel slag enhanced the graphitization degree of the residues. To explore the potential application of industrial waste, steel slag powder in combination with melamine pyrophosphate (MPP) was adopted to improve the flame retardancy of rigid polyurethane foam (RPUF). The incorporation of steel slag slightly reduced the thermal conductivity of the resulting flame-retardant RPUF samples. The addition of MPP and/or steel slag did not significantly alter the thermal stability in terms of T -10% and T max but did obviously increase the T -50% value, suggesting the improved thermal resistance of the residues. The coaddition of MPP and steel slag into RPUF resulted in higher LOI values and lower peak heat release rates than the samples incorporating either MPP or steel slag alone. The superior flame retardancy could be attributed to MPP promoting char formation, which then acted as a barrier at the beginning of RPUF thermal decomposition; simultaneously, the thermally stable inorganics in the steel slag powder strengthened the thermal resistance of this char layer. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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