A kind of surface coating method of spherical aluminum powder

Abstract

The invention discloses a surface coating method of spherical aluminum powder, which belongs to the technical field of surface modification, and comprises the following steps: firstly, dissolving an energetic polymer material containing nitrocellulose into ethyl acetate at room temperature to form an energetic high-molecular Molecular sol, and then disperse the spherical aluminum powder into ethyl acetate, then mix the materials of the above two steps evenly, then add the aqueous solution containing the emulsifier, and then add the aqueous solution containing the dispersant to the system, the spherical aluminum powder is contained The energy polymer material is coated and dispersed into spherical droplets, then a salt solution is added for dehydration and leaching, and finally the aluminum powder particles coated with the energy polymer material are obtained through separation and drying. The method is simple to operate, safe and non-toxic, and has low energy consumption. The aluminum powder particles coated on the surface of the energetic polymer material containing nitrocellulose can maintain good fluidity and water resistance. The invention is suitable for batch surface coating treatment of spherical aluminum powder.

Description

technical field [0001] The invention belongs to the technical field of surface modification, in particular to a surface coating method of spherical aluminum powder. Background technique [0002] As an additive to high-energy solid propellants, aluminum powder can effectively increase the energy of the propellant during combustion and the propulsion of the rocket. However, the micro-nano aluminum powder is easy to agglomerate during storage, which is not conducive to the improvement of propellant energy. Coating the surface of the aluminum powder can effectively prevent the oxidation of the aluminum powder and improve its dispersibility and combustion performance in the propellant. [0003] At present, researchers at home and abroad have conducted a lot of research on aluminum powder surface coating materials, such as silica coating, oleic acid coating, metal coating, polystyrene coating and so on. Chinese patent CN106984804 discloses a method for preparing nano-aluminum pow...

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Problems solved by technology

Chinese patent CN106984804 discloses a method for preparing nano-aluminum powder microcapsules, in which styrene is in-situ dispersed and polymerized in an alcohol-ether mixed solution. Although the preparation process is simple, the consumption of methanol and ether is large during the process. , economical and polluting to the operating environment, it is not suitable for implementation under industrial conditions, and the introduction of polystyrene into the surface of aluminum powder is not conducive to the improvement of the energy of the propellant system

Chinese patent CN108176851 discloses a method of coating protection with aluminum powder. Prepare a protective layer solution with paraffin, put in aluminum powder, stir in vacuum to drive out the solvent, and sieve and dry. The preparation process of this method is simple, but it is easy to cause mutual adhesion when the temperature rises Prone to large agglomeration, and paraffin as an inert material is not conducive to the increase of propellant energy level

[0004] There are some problems in the research on surface coating modification of nano-aluminum powder in China. Both in-situ coating and passivation coating method make the surface of aluminum powder contain a certain amount of oxide shell, the content of active aluminum is reduced, and the coating layer is mostly As an inert substance, it affects the energy level and combustion performance of the propellant, which limits the application of aluminum powder in the field of propellants and explosives

In addition, there is no report on the successful application of energetic material polymers to the surface coating modification of aluminum powder.

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