氧体积分数对阻燃三元乙丙橡胶燃烧特性的影响  

Effect of oxygen concentration on pyrolytic and combustion characteristics of flame⁃retardant EPDM Rubber

作　　者：岳海玲 郭子东 Yue Hailing;Guo Zidong(Investigation Institute,China People's Police University,Hebei Langfang 065000,China)

机构地区：[1]中国人民警察大学侦查学院,河北廊坊065000

出　　处：《消防科学与技术》2024年第2期255-260,共6页Fire Science and Technology

基　　金：河北省高等学校科学技术研究项目(ZC2021037)。

摘　　要：阻燃三元乙丙橡胶广泛用于公共建筑、交通工具等领域,火灾时其周围的氧体积分数会发生变化。为研究此类材料在真实火灾中的情况,以铺地用的阻燃三元乙丙橡胶为样品,采用火焰蔓延仪和热重/差热同步分析仪,在不同氧体积分数的氧氮混合气氛下进行试验,研究氧体积分数对燃烧特性的影响。结果表明,有氧气氛下,氧体积分数降低时,失重速率、放热量和活化能均降低,但反应模型不变。样品能够发生明火燃烧的氧体积分数范围为15%~18%。有明火燃烧时,氧体积分数降低时,火焰降低,刺激性黑烟量减少,残留物表面灰白色区域和裂纹减少,裂隙变浅;临界热辐射通量、等效对流换热系数和引燃温度升高,HRR曲线第一个峰值和火势蔓延速率降低;CO产率第二个峰值以及CO/CO_(2)值升高。在无明火燃烧时,样品释放出大量灰烟,残留物中部凸起,表面中部为灰黑色、有金属光泽的,底部有黄褐色黏稠液体,CO和CO_(2)产率远低于有焰燃烧。Fire-resistant EPDM rubber is widely used in public buildings,transport and other areas where the oxygen concentra-tion changes during a fire.In order to study such materials in real fires,this paper uses a flame-retardant EPDM flooring rubber as a sample and experiments are carried out using a FPA and TG-DTG-DSC analyzer under different oxygen volume fraction to study the effect of oxygen concentration on pyrolysis and combus-tion behavior.The results show that the rate of weight loss,heat release and activation energy decrease when the oxygen concentra-tion decreases in an aerobic atmosphere,but the reaction model remains unchanged.The oxygen volume fraction of the sample that can cause open flame combustion ranges from 15%to 18%.In the presence of open flame combustion,the decrease in oxygen concentration resulted in a lower flame,a decrease in the amount of irritating black smoke,a decrease in the amount of greyish-white areas and cracks on the surface of the residue,and a shal-lower fissure;an increase in the critical heat radiation flux,equiva-lent convective heat transfer coefficient,and ignition tempera-ture,and a decrease in the first peak of the HRR curve and in the rate of fire propagation;the second peak in the CO production rate,and an increase in the CO/CO_(2) value.In the case of combus-tion without open flame,the samples released a large amount of grey smoke,the middle of the residue was raised,the middle of the surface was grey-black,metallic,with yellow-brown viscous liquid at the bottom,and the CO and CO_(2) yields were much lower than those of flaming combustion.

关 键 词：阻燃三元乙丙橡胶 氧体积分数 燃烧 残留物 失重速率 热释放速率 活化能 

分 类 号：X932[环境科学与工程—安全科学] TU998.1[建筑科学—市政工程]