湿热老化对阻燃聚酯纤维板燃烧性能的影响

Influence of hygrothermal aging on the combustion performance of flame retardant polyester fiberboard

为了研究阻燃聚酯纤维板经过湿热老化后燃烧性能的变化,探究其燃烧性能与老化条件及时间之间的规律,对阻燃聚酯纤维板在恒温恒湿试验箱中进行了湿热老化试验,老化条件为温度40℃、相对湿度93%,以24 h为周期,分别进行了0、24、48、72、96、120 h的老化处理,并通过极限氧指数测试、水平垂直燃烧试验、锥形量热仪测试及热重分析等方法,对不同湿热老化时间处理后的阻燃聚酯纤维板的燃烧性能进行了测试。结果发现:阻燃聚酯纤维板在湿热老化后氧指数降低,且与老化时间呈线性减少的关系;水平燃烧线性速率加快,垂直燃烧性能等级降低;热释放速率峰值和有效燃烧热增大;初始分解温度逐渐降低,残炭量降低。研究结果可为阻燃聚酯纤维板的防火设计及安全使用提供参考。

In order to study the changing of the combustion performance of flame retardant polyester fiberboard after hydrothermal aging, and explore the relationship between its combustion performance and aging conditions and time, a hydrothermal aging test of flame retardant polyester fiberboard in a constant temperature and humidity test chamber is carried out. The aging conditions are 40 ℃, 93% Rh, 24 h as one cycle, and the samples are aged for 0 h, 24 h, 48 h, 72 h, 96 h, 120 h respectively. The flammability of flame retardant polyester fiber board treated with different damp heat aging time is tested by horizontal and vertical combustion test, cone calorimeter test and thermogravimetric analysis. The results show that the oxygen index of flame-retardant polyester fiber sheets decreases after hydrothermal aging, and the oxygen index decreased linearly with aging time;The linear rate of horizontal combustion is accelerated, and the vertical combustion performance level decreases;The peak value of heat release rate and effective combustion heat increase;The initial decomposition temperature gradually decreases, and the amount of residual carbon decreases. The results can provide reference for fire prevention design and safety use of the flame retardant polyester fiberboard.