聚对苯二甲酸丁二醇酯材料的热解燃烧特性研究
Study on Pyrolytic and Combustion Characteristics of Polybutylene Terephthalate Materials
为了研究聚对苯二甲酸丁二醇酯(PBT)材料在不同升温速率和热辐射强度下的热解及燃烧特性,采用锥形量热测试、单热重实验及热重-红外联用分析技术系统分析PBT的热稳定性、热解气体组分及其燃烧行为。结果表明,PBT的热解受升温速率影响。在热解过程中,PBT的热解产物主要包括CO₂、CO、苯及其衍生物、烷烃、烯烃和二氧化硅等物质,同时还会有醇类、酸类、含硫有机物等含氧有机化合物以及少量的水。升温速率为15 ℃/min时,协同反应机制导致残炭量显著减少,而较高的升温速率则促进CO2、CO等气体的产生。随着热辐射强度的增加,引燃时间缩短,热释放速率峰提升,有害气体与烟雾释放量加剧,CO2平均释放量上升0.14%,最大烟气生成速率增加0.05 m2/s。基于N-GAS模型、火灾性能指数、火灾增长指数及火蔓延指数的火灾危险性分析,证实了PBT材料的火灾风险与热辐射强度呈正相关。
To investigate the pyrolysis and combustion characteristics of polybutylene terephthalate (PBT) material under different heating rates and heat radiation intensities, a comprehensive analysis of the thermal stability, pyrolysis gas components, and combustion behavior of PBT was conducted using cone calorimetry, single thermogravimetric analysis, and thermogravimetric-infrared coupled analysis techniques. The results show that the pyrolysis of PBT is affected by the heating rate. During the pyrolysis process, the pyrolysis products of PBT mainly include CO2, CO, benzene and its derivatives, alkanes, alkenes, silicon dioxide, and other substances, as well as oxygen-containing organic compounds such as alcohols, acids, and sulfur-containing organic compounds, and a small amount of water. When the heating rate is 15 ℃/min, the synergistic reaction mechanism leads to a significant reduction in the amount of residual carbon, while a higher heating rate promotes the generation of gases such as CO2 and CO. As the heat radiation intensity increases, the ignition time is shortened, the peak of heat release rate is increased, and the release of harmful gases and smoke is intensified. The average CO2 release rate increased by 0.14%, and the maximum smoke generation rate increased by 0.05 m2/s. The fire hazard analysis based on the N-GAS model, fire performance index, fire growth index, and fire spread index confirms that the fire risk of PBT material is positively correlated with the heat radiation intensity.
聚对苯二甲酸丁二醇酯 / 热解特性 / 燃烧特性 / 火灾风险
Polybutylene Terephthalate / Pyrolysis characteristics / Combustion characteristics / Fire risk
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