内相粒径对现场混装乳化炸药非等温热分解特性的影响  

Effect of Particle Size of Internal Phase on Non-Isothermal Thermal Decomposition Characteristics of Field Mixed Emulsion Explosive

作　　者：吴攀宇 刘锋[1] 魏国 李松林 何祥 陈皓楠 WU Pan-yu;LIU Feng;WEI Guo;LI Song-lin;HE Xiang;CHEN Hao-nan(School of Chemical Engineering,Anhui University of Science and Technology,Huainan Anhui 232001,China)

机构地区：[1]安徽理工大学化学工程学院,安徽淮南232001

出　　处：《火炸药学报》2022年第2期249-256,I0005,共9页Chinese Journal of Explosives & Propellants

基　　金：国家自然科学基金(煤炭联合基金)(No.51134012);安徽理工大学研究生创新基金(No.2020CX2068)。

摘　　要：为研究内相粒径对现场混装乳化炸药基质热分解特性的影响,使用激光粒度仪与光学显微镜对乳化炸药基质的粒径与微观结构进行测试;利用TG-DTG技术测试了不同粒径乳化炸药基质的热分解过程,使用Kissinger法计算了热分解活化能;使用Coast-Redfern法确定了动力学机理函数。结果表明,随着现场混装乳化炸药基质内相粒径由13.13μm减小至3.97μm,其失水过程质量损失率由8.52%升至16.03%,起始分解温度由172.9℃升至207.6℃,平均DTG峰温由274.4℃升至282.3℃,剧烈分解阶段中,质量损失平均速率由0.136%/s降低至0.114%/s,热稳定性不断提高;粒径大于10μm的乳化炸药基质的热分解活化能约为80 kJ/mol,动力学反应机理受二维Valensi方程控制;粒径小于5μm的基质热分解活化能约为110 kJ/mol,动力学反应机理受三维Z-L-T方程控制。In order to study the effect of particle size of internal phase on the thermal decomposition characteristics of field mixed emulsion explosive matrix,the particle size and microstructure of emulsion explosive matrix with different particle sizes had been measured by laser particle size analyzer and optical microscope.The thermal decomposition process for the explosive matrix was measured by TG-DTG,and Kissinger′s method was used to calculate the activation energy of thermal decomposition,and the Coast Redfern method was used to determine the kinetic mechanism function.The results show that the mass loss rate of field mixed emulsion explosive matrix increases from 8.52%to 16.03%when the particle size decreases from 13.13μm to 3.97μm,and the onset thermal decomposition temperature(T_(onset))increases from 172.9 to 207.6℃,and the thermal decomposition peak temperature(T_(p))from the DTG curves increases from 274.4℃to 282.3℃.The average rate of mass loss in the violent decomposition stage decreases from 0.136 to 0.114%/s,and the thermal stability increases continuously with the decreasing of the particle sizes.When the particle size is more than 10μm,the activation energy of thermal decomposition for the emulsion explosive matrix is about 80 kJ/mol,and the kinetic mechanism is controlled by the 2D Valensi equation.When the particle size is less than 5μm,the activation energy of thermal decomposition of matrix is about 110 kJ/mol,and the kinetic mechanism is controlled by the 3D Z-L-T equation.

关 键 词：物理化学 乳化炸药 现场混装 内相粒径 TG-DTG 热分解特性 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] TQ560.1[化学工程—炸药化工]