HMX丙酮溶液在不同升温速率下的热爆炸研究

Study on Thermal Explosion of HMX Acetone Solution at Different Heating Rates

为了解奥克托今(HMX)热分解过程及其在不同溶剂中热爆炸特性,使用DSC-TG同步热分析仪研究HMX的热分解过程。根据升温速率分别为5、10、15、20K/min的DSC和TG-DTG曲线,利用Ozawa法和Kissinger法计算了动力学参数,求得HMX的分解活化能分别为369.9 k J/mol和379.7k J/mol。用Rogers公式和Arrhenius公式求得指前因子A和速率常数k分别为4.70×1034s-1、7.48×10-16s-1(120℃)。HMX在升温速率为5 K/min时,分解峰值温度的活化焓、活化熵、活化自由能分别为370.2 k J·mol-1、405.39 J·K-1·mol-1、146.04 k J·mol-1;用小容量测试法研究25%质量分数的HMX丙酮溶液在不同升温速率(3、4、5、6℃/min)下的热爆炸特性。结果表明:在试验条件下,HMX丙酮溶液的临界爆炸温度,随着升温速率的增加而升高。

In order to explore the thermal decomposition behavior of HMX and thermal explosion character in different solvents,the thermal decomposition process of HMX was studied with DSC-TG thermal analyzer. The kinetic parameters were calculated by Ozawa＇s method and Kissinger＇s method on the basis of the DSC and TG-DTG curves at heating rate of 5,10,15,20 K / min respectively. The decomposition activation energy of HMX was obtained as374. 8 k J / mol,and the decomposition activation energy of two methods were similar. The pre-exponential factor A and the rate constant k were 4. 70 × 10^34s^-1and 7. 48 × 10^-16s^-1（ 120℃）,obtained by Rogers formula and Arrhenius formula respectively. The enthalpy of activation,entropy of activation and free energy of activation for HMX on the temperature of decomposition peak were 370. 2 k J·mol^-1,405. 39 J·K^- 1·mol^-1 and 146. 04 k J·mol^-1 respectively. The thermal explosion character of HMX acetone solution with 25% mass fraction was studied by the small capacity test experiment,at different heating rates of 3,4,5,6℃ / min. The experiment results showed that the critical explosion temperature of HMX acetone solution rose with the increase of heating rate.