Preparation method of modified hexanitrohexaazaisowurtzitane, modified hexanitrohexaazaisowurtzitane and application of modified hexanitrohexaazaisowurtzitane

Abstract

The invention provides a preparation method of modified hexanitrohexaazaisowurtzitane, the modified hexanitrohexaazaisowurtzitane and application of the modified hexanitrohexaazaisowurtzitane. The preparation method comprises the following steps: mixing an epsilon-hexanitrohexaazaisowurtzitane crystal, dopamine or a dopamine derivative and a buffer solution, and continuously introducing air to obtain the modified hexanitrohexaazaisowurtzitane. According to the method, the reaction time of dopamine auto-polymerization is greatly shortened, coating is more uniform, and meanwhile, coating thickness is increased and controllable. Compared with a used epsilon-CL-20 crystal raw material, the modified epsilon-CL-20 crystal treated by the method provided by the invention has the advantages that the crystal transition temperature of the modified epsilon-CL-20 crystal can be increased by 40 DEG C or more, solubility in ethyl acetate can be reduced by 30-50%, compression resistance can be increased by 37% at most, and the modified epsilon-CL-20 crystal is more suitable for cast explosives.

Description

technical field [0001] The present invention relates to the field of compound surface modification, and furthermore, relates to a preparation method of modified hexanitrohexaazaisowurtzitane, modified hexanitrohexaazaisowurtzitane and its application. Background technique [0002] Fusion-cast explosive is a type of charge that is widely used in various warheads at the present stage. It has a wide range of application values ​​because of its excellent mechanical properties and the characteristics of being able to adapt to various warhead structures. Hexanitrohexaazaisowurtzitane (CL-20 or HNIW) is a cage polynitrate ammonium high-density compound, which was first synthesized by an American laboratory in 1987. It is currently known as the single substance explosive with the highest energy and the highest detonation velocity. It has wide application prospect and application value. There are four crystal forms of CL-20 under normal temperature and pressure conditions, namely α,...

AI Technical Summary

Problems solved by technology

In addition, CL-20 is easily soluble in some commonly used casting carriers, such as DNP (3,4-dinitropyrazole), MTNP (1-methyl, 3,4-trinitropyrazole), and its mechanical properties Poor, all lead to CL-20 can not be well applied in cast explosives

[0003] Relevant studies at home and abroad have found that the starting temperature of the crystal transformation of CL-20 from the ε crystal form to the γ crystal form is about 135°C. In terms of inhibiting the crystal transformation of CL-20, coating methods are often used to inhibit CL-20 at home and abroad. For the crystal transformation of CL-20, coating CL-20 with adhesives such as natural rubber, butadiene rubber, and HTPB can inhibit the crystal transformation of CL-20 to a certain extent, and increase the crystal transformation temperature by 15-20°C. However, the method is complicated and the degree of inhibition is limited; in terms of improving the solubility resistance of CL-20, conventional coating methods are usually used at home and abroad to reduce the solubility of CL-20 in the casting carrier. For example, Jilin University uses 2% perfluorooctanoic acid to coat CL-20. 20. Reduced the solubility of CL-20 in ethyl acetate and DNP (3,4 dinitropyrazole), but the disadvantage is that the mechanical properties of the particles are poor

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