Method for Surface Coating of Explosive Particles

Abstract

The invention discloses a surface coating method for explosive particles. The surface coating method comprises the following steps of: (1) depositing vapor deposition substances at the surfaces of the explosive particles by utilizing a vacuum physical vapor deposition method, so as to obtain explosives coated by wax; and (2) depositing chemical vapor deposition substances at the surfaces of the explosive particles obtained in the step (1) by utilizing a vacuum chemical vapor deposition method. According to the coating method, the explosive particles are coated by a Parylene film after being coated by the wax, as the Parylene film has relatively strong high temperature resistance and can be used for further coating the explosives coated by the wax, the problem that the explosives coated by the wax cannot resist the high temperature is solved, and the explosive particles coated by the Parylene film after being coated by the wax can be used for casting the explosives or composite explosives.

Description

technical field [0001] The invention belongs to the field of vacuum deposition technology, in particular to the vacuum deposition technology for surface coating of granular materials, especially the method for surface coating of explosive particles. Background technique [0002] The coating of organic or inorganic particles has a wide range of uses in modern industry and technology. To this end, various particle coating technologies have been developed, such as liquid phase coating technology, gas phase coating technology, high temperature pyrolysis coating technology, explosion coating technology, arc method coating technology, pulse laser coating technology, etc. Especially in recent years, with the development of nanotechnology, various nanoparticle surface coating technologies have emerged. However, for the surface coating technology of explosive particles, there are relatively few new coating technologies, because all coating technologies that need to be carried out at...

AI Technical Summary

Problems solved by technology

[0003] Although various coating methods have their own characteristics, they have not achieved complete coating and ultra-thin coating of explosive particles.

We believe that it is difficult to overcome the following problems in the coating of explosive particles in the liquid state: first, it is difficult to avoid the agglomeration of the particles, resulting in incomplete coating of the particles; in addition, the coating in the liquid state is regarded as the If the particle surface is coated, according to the coating theory, there must be a minimum film-forming thickness (the thickness is generally on the micron or sub-micron scale) for coating spreading, which makes it impossible to obtain ultra-thin coating

[0005] At the same time, in the prior art, in order to reduce the sensitivity of explosive granules and improve the safety of explosive granules, those skilled in the art use paraffin to coat explosive granules, but uneven coating is prone to occur during the coating process. Inhomogeneity will affect the safety performance of explosives; at the same time, it is difficult to achieve ultra-thin coating. If ultra-thin coating is not possible, a relatively large amount of paraffin is required for coating, which will reduce the energy of explosives

After the paraffin-coated explosive particles are used for melting and casting explosives or other explosives, due to the low melting point of the paraffin wax coated on the surface, it is easy to desorb the paraffin wax during the application process.

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