Study On The Design And Basic Application Of Emulsion Binder System/CL-20 Based Explosive Ink

Direct writing technology is an important way to realize high precision and high quality charge of MEMS micro-initiation train,and how to design high performance direct-written explosive ink has become a hot spot in this field.In this paper,on the basis of the emulsifying principle,the oil-in-water emulsion binder system was designed and prepared,and formed an explosive ink formula with nano-CL-20 high-energy particles.The explosive ink was charged in micro-structured energetic device by the micro-direct-writing device.The molding effect,safety performance and detonating transfer ability of micro-scale charge was tested and analyzed,and its application effect was studied.The main contents are as follows:?1?PVA solution as water phase,F₂₆ type fluororubber?Viton?ethyl acetate solution as oil phase,Viton/PVA emulsion binder system was prepared.The orthogonal experiment of L₂₅?5⁶?was designed with the help of SPSS software,the contents of each component and the conditions of the preparation process of binder emulsion were systematically optimized,and the static state stability time of emulsion is about 360 h.The size of the emulsion droplets was 20¹20?m,the distribution was uniform,and there was no agglomeration phenomenon.?2?The main explosive of explosive ink was screened and ultrafined.The relationship between the content of ultrafine CL-20 and the rheological properties of explosive ink was studied.The optimal formulation of explosive ink was obtained,and the DIW technology was used to carry out graphics of the explosive ink.The micro-structure and crystal type of the samples was characterized by SEM and XRD.The results showed that the n value of the suspension with 90 wt.%CL-20 reached a maximum value,which can meet both the requirements of energy and DIW technology at the same time.The surface of the sample was smooth,there were no obvious pores inside,and the crystal type of CL-20 was still?.?3?The thermal decomposition performance and mechanical sensitivity of the CL-20based explosive ink sample was tested and analyzed.The results showed that the DSC thermal decomposition activation energy of the sample was higher than the ultrafine CL-20about 10 kJ·mol^-1.Compared with the raw and ultrafine CL-20,the H₅₀ value of the sample was increased by 23.9 cm and 2.7 cm,respectively,and the explosion probability of the samples decreased from 100%to 92%.Hence we arrive at the following conclusions:the thermal stability of the sample is better than ultrafine CL-20;the sensitivity of the sample explosion was reduced compared with raw CL-20 and ultrafine CL-20 under the external stimulation of impact and friction.?4?The detonation performance of the micro-size charge of CL-20 based explosive ink sample was tested,and the results showed that the critical detonation thickness was approximately 11?m at 1.0 mm fixed width in the wedge tests,and the critical detonation size was 0.3 mm×0.3 mm in the cross-sectional gradient decline tests.When the cross section size of the charge is 1.0×1.0 mm,the detonation velocity was 7634 m·s^-1,the maximum corner turning ability of the detonation wave was 140°and can be successfully propagated in the micro-size charge circuit with multiple 90°corners.In the micro explosive train and synchronous explosive circuit,the micro-scale charge line could stably propagate and successfully initiated the lower stage charge?PBXN-5?,which has a good application effect.