摘要
利用岛津DTG-60H型热重分析仪,在氮气气氛、升温速率为15℃/min条件下,对自行配制的一种超薄型钢结构防火涂料的热分解过程进行了分析,发现该防火涂料的热解过程可分为5个阶段。用Coats-Redfern积分方法分阶段对TG曲线数据进行了处理,并用常见的12种反应机理方程进行拟合,发现各阶段反应机理不尽相同:第一阶段属于一维扩散反应机理D1,第二、第三阶段为1.5级化学反应模型RO(1.5),第四阶段为二级化学反应模型RO(2),第五阶段为一级化学反应模型RO(1)。同时,求解出了各阶段的热解动力学参数及动力学方程。
The present article aims to report the author＇s study on the pyrolysis of extremely thin fire resistant coating for steel structure. As is known, the DTG-60H SHIMADZU thermo gravimetric apparatus can be used for analyzing the pyrolysis of extremely thin fire-resistant coating for steel structure under the circumstance of nitrogen media at the heating rate of 15 ℃/min. We have found that the whole pyrolysis course can be divided into five stages. Furthermore, we have also found that Coats-Redfern method can be adopted to process the data of the TG curve of all the five stages, and twelve commonly used reaction equations are used to fit the data. It thus is concluded that the reaction mechanisms of all stages are not the same too： the first stage can be defined as one-dimensional diffuseness reaction D1 while the second and the third can be defined as 1.5 order chemistry reaction RO（1.5）. As to the fourth stage, it can be described as the secondorder chemistry reaction RO（2）, whereas the last stage can be said to be the first-order chemistry reaction RO（1）. At the same time, we have also worked out the pyrolysis parameters and the kinetic equations of the pyrolysis.
出处
《安全与环境学报》
CAS
CSCD
2006年第5期104-107,共4页
Journal of Safety and Environment
基金
航空科学基金项目(04H54007)
关键词
物理化学
防火涂料
热分析
动力学
反应机理
physical chemistry
fire resistant coating
pyrolysis
kinetics
reaction mechanism
