1. Balanced Thermal Insulation, Flame-Retardant and Mechanical Properties of PU Foam Constructed via Cost-Effective EG/APP/SA Ternary Synergistic Modification.
- Author
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Li, Hongfu, Hou, Longtao, Liu, Yunpeng, Yao, Zhiyu, Liang, Lixing, Tian, Dangxin, Liu, Chunhui, Xue, Junqiang, Zhan, Linshan, Liu, Yongqi, Zhen, Zhilu, and Niu, Kangmin
- Subjects
THERMAL insulation ,FIREPROOFING agents ,FOAM ,INSULATING materials ,ENTHALPY ,PLASTER ,URETHANE foam ,THERMAL conductivity - Abstract
To address the challenge of balancing the mechanical, thermal insulation, and flame-retardant properties of building insulation materials, this study presented a facile approach to modify the rigid polyurethane foam composites (RPUFs) via commercial expandable graphite (EG), ammonium polyphosphate (APP), and silica aerogel (SA). The resulting EG/APP/SA/RPUFs exhibited low thermal conductivity close to neat RPUF. However, the compressive strength of the 6EG/2APP/SA/RPUF increased by 49% along with achieving a V-0 flame retardant rating. The residual weight at 700 °C increased from 19.2 wt.% to 30.9 wt.%. Results from cone calorimetry test (CCT) revealed a 9.2% reduction in total heat release (THR) and a 17.5% decrease in total smoke production (TSP). The synergistic flame-retardant mechanism of APP/EG made significant contribution to the excellent flame retardant properties of EG/APP/SA/RPUFs. The addition of SA played a vital role in reducing thermal conductivity and enhancing mechanical performance, effectively compensating for the shortcomings of APP/EG. The cost-effective EG/APP/SA system demonstrates a positive ternary synergistic effect in achieving a balance in RPUFs properties. This study provides a novel strategy aimed at developing affordable building wall insulation material with enhanced safety features. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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