A kind of method adopting graphene oxide Pickering emulsion to construct ammonium dinitramide coating layer

Abstract

The invention discloses a method for constructing a coating layer of ammonium dinitramide by using graphene oxide Pickering emulsion, which solves the problem that the ammonium dinitramide is easy to absorb moisture. The method uses a solvent insoluble in ammonium dinitramide as a dispersion medium and amphiphilic graphene oxide as a stabilizer to prepare ammonium dinitramide droplets / dispersion by ultrasonic irradiation and homogenization at the melting temperature of ammonium dinitramide medium for stable emulsion systems. The emulsion system is rapidly cooled to promote the cooling and recrystallization of ammonium dinitramide droplets to obtain a graphene oxide-coated ammonium dinitramide composite powder. Then, the composite powder is placed in a low-temperature reducing steam to obtain graphene-coated ammonium dinitramide. Compared with the traditional dinitramide ammonium coating method, the invention does not need any external auxiliary agent, and the experiment is simple and easy to operate. The morphology and thickness of the graphene coating layer constructed by the Pickering emulsion method are precisely controllable, and the hygroscopicity of ammonium dinitramide is significantly reduced after coating.

Description

technical field [0001] The invention relates to a method for preparing an ammonium dinitramide coating layer, and belongs to the technical field of functional material preparation. Background technique [0002] As a new generation of propellant oxidizer components, ammonium dinitramide (ammonium dinitramide, NH 4 + N(NO 2 ) 2 ) has high energy density, and can significantly increase the energy of the propellant when added to the propellant. Moreover, the ammonium dinitramide molecule does not contain carbon and chlorine elements, which greatly reduces the characteristic signal of propellant gas, reduces the corrosion of engine equipment by combustion products and the pollution of atmospheric environment. Therefore, ammonium dinitramide has always been a hot spot for propellant researchers, and it is considered to be an ideal oxidant to replace the traditional oxidants ammonium perchlorate (AP) and ammonium nitrate (AN) to develop low characteristic signal and green prope...

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Problems solved by technology

Adsorption coating of small molecule compounds reported by researchers at home and abroad (Heintz T., Teipel U. Coating of particulate energetic materials [C]. 31th International Annual Conference of ICT. Karlsruhe, German, 2000, 120, 1–12.), large Molecular polymer coating (Xu Huixiang, Liao Linquan, Liu Yu. Performance research on polyurethane adhesive coating spherical ADN. Energetic Materials, 2008, 16, 712-715.) and macromolecular prepolymer cross-linking and curing coating ( Lu Xianming, Mo Hongchang, Chen Bin, Liu Yajing, Xu Minghui. GAP / BPS cross-linked body coated spherical ADN particles. Energetic materials. 2016, 24, 1080-1083.) and other methods are effective in reducing the moisture absorption of ammonium dinitramide However, the following problems still exist: (1) The physical coating layer such as small molecule adsorption or polymer coating is easy to damage or produce local defects; (2) The thickness and shape of the cross-linked polymer coating layer are difficult to control, Significantly affect the contact between ammonium dinitramide and propellant fuel, energetic components, combustion catalysts, etc., thereby reducing the energy characteristics of the propellant