2,6-二氨基-3,5-二硝基吡啶-1-氧化物基PBX的热安全性研究

(1.安徽理工大学化学工程学院,安徽 淮南 232001; 2. 南京理工大学化工学院,江苏 南京 210094)

物理化学; 2,6-二氨基-3,5-二硝基吡啶-1-氧化物(ANPyO); 高聚物黏结炸药; PBX; 黏结剂; 热安全性

Thermal Safety of 2,6-Diamino-3,5-dinitropyridine-1-oxide Based PBX
HE Zhi-wei1,WANG Yang1,LIU Feng1,GUO Zi-ru1,CHENG Ao1, LIU Zu-liang2

(1.School of Chemical Engineering, Anhui University of Science and Technology, Huainan Anhui 232001, China; 2. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)

physical chemistry; 2,6-diamino-3,5-dinitropyridine-1-oxide(ANPyO); polymer bonded explosive; PBX; binder; thermal safety

DOI: 10.14077/j.issn.1007-7812.201903001

备注

为了研究2,6-二氨基-3,5-二硝基吡啶-1-氧化物(ANPyO)基高聚物黏结炸药(PBX)的热安全性,分别以氟橡胶F2311和丁晴橡胶NBR-26为主体设计两种黏结剂体系,采用水悬浮-溶解-蒸馏法制备ANPyO基PBX炸药。利用扫描电子显微镜(SEM)、差示扫描量热法(DSC)和热重法(TG)表征不同黏结剂体系PBX的结构和性能,计算了两种黏结剂体系PBX的热分解动力学参数和热爆炸参数,并获得了被400K气氛环绕的半径为1m的球形、无限圆柱形或无限平板状PBX的热感度概率密度函数S(T)与温度T的关系曲线。结果 表明,以丁晴橡胶NBR-26为黏结剂体系主体PBX的活化能E为173.19kJ/mol、指前因子ln(A /s-1)为28.58、自加速分解温度TSADT为550.01K、热点火温度Tbe为565.81K、热爆炸临界温度Tbp为625.06K; 以氟橡胶F2311为黏结剂体系主体PBX的活化能E为143.78kJ/mol、指前因子ln(A /s-1)为22.89,自加速分解温度TSADT为539.99K,热点火温度Tbe为560.28K,热爆炸临界温度Tbp为615.55K; 球形PBX的热安全性稍高于无限圆柱或平板状PBX,以丁晴橡胶NBR-26为黏结剂体系主体PBX的热安全性高于氟橡胶F2311为黏结剂体系主体PBX。

To study the thermal safety of 2,6-diamino-3,5-dinitropyridine-1-oxide(ANPyO)based PBX, two kinds of binder systems were designed with fluorine rubber F2311 and nitrile-butadiene rubber NBR-26, and ANPyO-based PBXs were prepared by means of solution-water suspending-distillation method. The structures and properties of PBX with different binder systems were characterized by scanning electron microscopy(SEM), differential scanning calorimetry(DSC)and thermogravimetry(TG). The thermal decomposition kinetic parameters and thermal explosion parameters were calculated,and the relation curves of thermal sensitivity probability density function S(T) vs. T for infinite cylindrical, spheroidic or infinite platelike PBX with the radius of 1m surrounded with 400K atmosphere were obtained. The results show that the activation energy E of PBX with nitrile-butadiene rubber NBR-26 as binder system is 173.19kJ/mol, the pre-exponential factor ln(A/s-1)is 28.58, the self-accelerating decomposition temperature TSADT is 550.01K, the thermal ignition temperature Tbe is 565.81K, and the critical temperature of thermal explosion Tbp is 625.06K.The activation energy E of PBX with Fluorine rubber F2311 as binder system is 143.78kJ/mol, the pre-exponential factor ln(A/s-1)is 22.89, the self-accelerating decomposition temperature TSADT is 539.99K, the thermal ignition temperature Tbe is 560.28K, and the critical temperature of thermal explosion Tbp is 615.55K. Thermal safety of spherical PBX is slightly better than that of the infinite cylindrical or infinite flat PBX, and the thermal safety of PBX with nitrile-butadiene rubber NBR-26 as binder system is better than that of PBX with Fluorine rubber F2311 as binder system.