可膨胀石墨改性APP/PER/EN防火涂料热降解行为

THERMAL DEGRADATION OF EXPANDABLE GRAPHITE MODIFIED APP/PER/EN FLAME RETARDANT COATING

采用可膨胀石墨(EG)对APP/PER/EN防火体系进行改性,制备成一种新型EG改性APP/PER/EN防火涂料。运用示差热分析(DTA)、热重分析(TG)、扫描电镜分析(SEM)、能谱分析(EDS)和隔热性能试验分析研究APP/PER/EN防火涂料和EG改性防火涂料的热降解行为、残余炭体元素含量、成炭率和隔热性能。EG改性防火涂料的APP-PER-EN之间的化学反应膨胀过程与可膨胀石墨物理膨胀过程作用温度范围接近,能产生很好的协同配合作用。膨胀石墨提高了APP/PER/EN防火涂料炭质层的成炭率、抗氧化性和热稳定性。EG添加量过高(≥15%)会造成燃烧后期炭质层脱离基材。10%EG(质量分数)添加量能有效提高APP/PER/EN防火涂料的隔热防火性能。

Expandable graphite was added to APP/PER/EN system to get a new kind of EG modified flame retardant coating. The thermal degradation, element content in residue char, char formation rate, heat insulation property of APP/PER/EN coating and EG modified flame retardant coatings were studied by using DTA, TG, SEM, EDS and heat insulation experiment. The temperature range of chemical expanding reaction among APP. PER and EN is near to that of a physical expanding process of expandable graphite, so the two processes can have good synergiceffect. Expandable graphite can greatly improve the char formation rate, antioxidationand heat stability of a char layer. Too high content of EG （≥15%） makes the char layer easily detached from the substrate. 10% EG （mass fraction） can efficiently improve heat insulation and flame retardant properties of the APP/PER/EN coating.