Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Preparation and performance study of nano HNS@CL 20 DNB eutectic explosive core shell complex
| DOI: | 10.11809/bqzbgcxb2024.06.038 |
| Keywords: | CL 20; DNB; HNS; Pickering emulsions; eutectic |
| Abstract: | Hexanitrohexaazaisowurtzitane (CL 20), a high energy elemental energetic material, has limited its wide application in the military field due to its high mechanical sensitivity. The stable Pickering emulsion was prepared by using stearic acid modified nano hexanitrostilbene (HNS) as surfactant and ethyl acetate solution of CL 20 and 1, 3 dinitrobenzene (DNB) as oil phase under the assistance of ultrasound. The effects of interfacial properties of nano HNS, the amount of modified nano HNS and the standing time of emulsion on the stability of emulsion were studied. The core shell composite of nano HNS@CL 20 DNB cocrystal explosive was successfully prepared, and the morphology, structure, thermal decomposition performance and safety performance of the composite were characterized. The results show that uniform and stable Pickering emulsion can be prepared when the content of modified HNS is 10 20% and the standing time is less than 200 min. The particle size of the core shell composite is about 5 μm, and the surface is coated with a layer of modified nano HNS; Due to the eutectic structure, the thermal decomposition peak temperature of the composite is 247.7 ℃, and the thermal decomposition exothermic peak temperature is 7.9 ℃ higher than that of the raw material CL 20. The characteristic drop height H 50 of the composite is 43 cm, and the friction sensitivity explosion probability is 36%. Compared with the raw material CL 20, the safety performance is greatly improved. The preparation method used in this paper is safe and simple, and the components are not non energetic materials. In theory, the energy of the core shell composite is not reduced. It is expected to provide new ideas for the design and preparation of composite explosives containing CL 20, and improve the applicability of CL 20 in the military field. |
| Published: | 2024-06-28 |