岩石型乳化炸药的热分解动力学

Thermal Decomposition Kinetics of Rock Emulsion Explosives

采用DSC技术分析了岩石型乳化炸药的乳化基质、亚硝酸钠敏化的岩石型乳化炸药以及亚硝酸钠和玻璃微珠复合敏化的岩石型乳化炸药3个试样的热分解过程,用FWO法、FRL法(Friedman法)和非线性等转化率法(NL-INT法)等非模函数法以及Kissinger法、Achar法、Coats-Redfern法和ˇSatava-ˇSesták法计算出3个试样的活化能E均为110kJ/mol左右,指前因子A的量级为108~109s-1,在升温速率为2.5、5.0、7.5K/min时3个试样的热分解机理为n=2的随机成核和随后成长的Avrami-Erofeev方程,在升温速率为10和20K/min时的热分解机理为n=2的三维扩散、球形对称Jander方程。得出在配方基本一致的前提下,3个试样具有相近的热分解行为,NaNO2或玻璃微珠基本上不影响乳化基质的热分解过程。

The thermal decompositions of emulsified bases of rock emulsion explosive and its two products sensitized by NaNO2 and NaNO2 and glass micro balloon respectively have been analyzed by DSC technique. The Flynn-Wall-Ozawa method, Friedman-Reich-Levi method, integral isoconversional non linear method, Kissinger method, Aehar method, Coats-Redfern method and S atava-Sestc^k method were used to calculate the kinetic parameters such as activation energy, pre-exponential factor and to determine mechanism function. The results show that the three samples have almost the same activation energy and pre-exponential factor, which are about 110 kJ · mol^-1 and 10^8- 10^9s^- 1, respectively. Their thermal decomposition mechanism are Avrami-Erofeev equation （n = 2） at heating rates of 2.5, 5.0 and 7.5 K · min^-1 and Jander equation （three-dimension diffusion, n = 2） at the heating rates of 10 and 20K · min^- 1. Therefore, the thermal decomposition behaviors of the three samples are almost the same, NaNO2 or glass micro balloon have little effect on the thermal decomposition of the emulsion base.