Technology Of Research CL-20-based Explosives Of Low Energy Detonating

Exploding foil initiator is going to be miniaturization of Low energy, while facing themain problem is due to the decrease in the amount of the charge, resulting in insufficientoutput capacity charge, which reduces the reliability of initiation. Thus requiring the loadingof explosives with a low ignition energy and must have a high energy output, while thetraditional exploding foil initiator of loading is generally HNS-IV explosives. BecauseHNS-IV requires high energy and lack of detonation output capability, can not be used lowenergy exploding foil initiator. Hexanitrohexaazaisowurtzitane (HNIW or CL-20) as one oftoday’s most powerful explosive substance, its energy output is higher than the HNS-IVnearly200%, alternative HNS-IV. However, as CL-20with high mechanical properties, cannot be directly used for low-energy exploding foil detonator needs to be studied. The mainwork is as follows:Firstly, the software Material Studio is used to construct and optimize ε-CL-20super cell,four kinds of high polymer molecule chains and PBX model. Using the DISCOVER model inMaterial Studio, with COMPASS force field and the method of quantum chemistry, thebinding energy of ε-HNIW with polymer PVDF、Estane5703、F2311and F2314are calculatedunder the same condition. The result indicated that the order of the binding energy betweenthree kinds of high polymer and ε-HNIW was as follows: ε-CL-20/Estane5703＞ε-CL-20/PVDF>ε-CL-20/F2311＞ε-CL-20/F2314.Secondly, the high-quality CL-20was prepared using self-made ultrasonic sprayassisted equipment. Scanning electron microscopy (SEM)、Laser particle size analyzer andX-ray diffraction (XRD) were employed to characterize the morphology and polymorph ofthe samples. The thermostability was analyzed by differential scanning calorimetry(DSC) andthe impact sensitivity was measured by impact sensitivity analyzer. The results shown that, compared to raw CL-20, recrystallized CL-20samples were uniform in spherical shapes andhad better dispersion,. The mean particle size of CL-20was1.49um and the type of sphericalCL-20was ε phase. Impact sensitivity and friction sensitivity tests indicated that sphericalCL-20is less sensitive than raw CL-20. The drop height (H50) of CL-20was increased from21.98of raw CL-20to46.67cm of spherical CL-20. Percentage of its explosion reduced from100%to72%of the raw CL-20. Through the recrystallization process, the activation energyand thermal explosion of CL-20slightly reduced.Finally, CL-20/Estane5703explosives were successfully prepared using water slurrymethod. Using single factor experiment researches the optimal coating conditions: agitatingrate is500r/min; degree of vacuum is0.04MPa; adding rate is5.3mL/min; solutiontemperature is65℃. Scanning Electron Microscope (SEM) were employed to characterizeparticle size, morphology of the raw and coated samples and the effect of the coating, and themechanical sensitivities, shock sensitivity, thermal sensitivity and thermal decompositioncharacteristics (DSC) were also measured and analyzed. Estane5703was successfully coatedwith on the CL-20,the shape of the powder particles were spherical. CL-20based PBXexplosives excellent thermal stability than the more refined CL-20, and by the impactsensitivity of security testing and security testing small partition.