Preparation technology of HMX-based insensitive booster explosives

doi:10.16265/j.cnki.issn1003-3033.2022.02.019

Abstract

Abstract:

In order to obtain insensitive booster explosives with better performance, based on HMX raw materials, fine-grained HMX was prepared by using solvent-non-solvent recrystallization technology and ultrasonic spray technology. Meanwhile, coated HMX with acrylate rubber (ACM), F₂₆₀₂ and Viton A as binders was prepared by using the experiment method, and its safety was tested and analyzed. The results indicate that after refinement, the thermal stability and thermal sensitivity of HMX are reduced, while its impact stability are greatly improved. When coated HMX is prepared, its apparent activation energy and pre-exponential factors are greater than that of refined samples under the condition of the same ratio of binder and raw material, and moreover, HMX coated with ACM will result in better thermal stability. According to the critical temperature of thermal explosion, it can be concluded that explosives coated with ACM at the ratio of 95∶5 has the best performance, and impact sensitivity test also shows that ACM has the most obvious desensitization effect.

Key words: cyclotetramethylene tetranitramine (HMX), insensitive booster explosive, preparation, recrystallization, water suspension method

GUO Haijun, WU Yuchen, TANG Hanlu, WANG Kai, WANG Liang, XU Chao. Preparation technology of HMX-based insensitive booster explosives[J]. China Safety Science Journal, 2022, 32(2): 139-144.

Figures/Tables 13

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Tab.1

Kinetic parameters of thermal decomposition

样品	E_a/(kJ·mol^-1)	lgA	$t p 0$ /℃	$t e$ /℃
原料HMX	436.30	38.11	275.43	281.30
细化HMX	414.26	36.01	276.07	282.24

Tab.1

Tab.2

Fig.6

Fig.7

Fig.8

Tab.3

Tab.4

Thermal performance parameters of PBX explosives with HMX based molding powder

样品	E_a/(kJ·mol^-1)	lgA	$t p 0$ /℃	$t e$ /℃
细化HMX	414.26	36.01	276.07	282.24
HMX/ACM	462.75	40.68	275.92	281.93
HMX/F₂₆₀₂	436.16	38.18	275.90	281.77
HMX/Viton A	383.61	36.01	277.73	276.06

Tab.4

Tab.5

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样品	特性落高H₅₀/cm	标准偏差σ
原料HMX	15.90	0.035
细化HMX	48.65	0.029

样品	不同升温速率条件下的峰温/℃
样品	5 ℃/min	10 ℃/min	20 ℃/min
HMX/ACM	279.84	283.26	287.39
HMX/F₂₆₀₂	280.44	284.05	288.48
HMX/Viton A	281.25	285.37	290.39

样品	撞击感度
样品	特性落高/cm	标准偏差
HMX/ACM	56.28	1.023
HMX/F₂₆₀₂	45	1.038
HMX/Viton A	41	1.005