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Method for constructing ammonium dinitramide coating layer by adopting graphene oxide Pickering emulsion

A technology of ammonium dinitramide and Pickering emulsion, applied in chemical instruments and methods, nitrated acyclic/alicyclic/heterocyclic amine explosive compositions, inorganic chemistry, etc., can solve the thickness of cross-linked polymer coating It is difficult to control and control the morphology, reduce the moisture absorption of ammonium dinitramide, and reduce the energy characteristics of the propellant, so as to achieve the effect of significant barrier performance, reduced hygroscopicity, and improved energy release rate.

Active Publication Date: 2019-07-09
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment provides a kind of method adopting graphene oxide Pickering emulsion to construct ammonium dinitramide coating layer, and this method specifically comprises the following steps:

[0023] Step 1: Surface modification of graphene oxide

[0024] Mix 0.1 g of graphene oxide with 50 ml of deionized water, and disperse by ultrasonic to obtain a stable graphene oxide suspension. Dissolve 0.001g of dodecylamine in 50ml of ethanol, put the above two solutions in a three-necked flask and mix them, stir at 90°C for 2h, and reflux the reaction system to obtain a precipitated reaction product. The reaction precipitate was separated from the dispersion medium through a filter membrane, and the filtered product was re-added into 50 ml of ethanol, ultrasonically dispersed for 10 minutes, and the mixed solution was filtered and dried to obtain a precipitated reaction product. The above process was repeated 5 times to fully remove physically adsorbed dodecylamine, and th...

Embodiment 2

[0032] This embodiment provides a method of using graphene oxide Pickering emulsion to construct an ammonium dinitramide coating layer. Steps 3 and 4 of this method are the same as those in Example 1, except for steps 1 and 2.

[0033] Step 1: Surface modification of graphene oxide

[0034]0.3 g of graphene oxide was mixed with 100 ml of deionized water, and dispersed by ultrasonic to obtain a stable graphene oxide suspension. Dissolve 0.002g of octadecylamine in 50ml of ethanol, put the above solution in a three-necked flask, stir at 90°C for 2h, and reflux the reaction system to obtain a precipitated reaction product. The reaction precipitate was separated from the dispersion medium through a filter membrane, and the filtered product was re-added into 50 ml of ethanol, ultrasonically dispersed for 10 minutes, and the mixed solution was filtered and dried to obtain a precipitated reaction product. The above process was repeated 5 times to fully remove the physically adsorbed...

Embodiment 3

[0038] This embodiment provides a method of using graphene oxide Pickering emulsion to construct an ammonium dinitramide coating layer. Steps 3 and 4 of this method are the same as those in Example 1, except for steps 1 and 2.

[0039] Step 1: Surface modification of graphene oxide

[0040] Mix 0.1 g of graphene oxide with 100 ml of deionized water, and disperse by ultrasonic to obtain a stable graphene oxide suspension. Dissolve 0.01 g of cyclohexylamine in 50 ml of ethanol, put the above solution in a three-necked flask, stir at 90° C. for 2 h, and reflux the reaction system to obtain a precipitated reaction product. The reaction precipitate was separated from the dispersion medium through a filter membrane, and the filtered product was re-added into 50 ml of ethanol, ultrasonically dispersed for 10 minutes, and the mixed solution was filtered and dried to obtain a precipitated reaction product. The above process was repeated 5 times to fully remove the physically adsorbed ...

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Abstract

The invention discloses a method for constructing ammonium dinitramide coating layer by adopting graphene oxide Pickering emulsion, which solves the problem that ammonium dinitramide is easy to absorbmoisture. The solvent which cannot dissolving ammonium dinitramide is used as the dispersion medium, amphiphilic graphene oxide is used as stabilizer, so as to prepare a stable emulsion system of ammonium dinitramide droplets / dispersion medium by ultrasonic irradiation and homogenization at the melting temperature of ammonium dinitramide. Ammonium dinitramide composite powder coated with grapheneoxide was obtained by cooling the emulsion system rapidly and making ammonium dinitramide droplets cool and recrystallize. Then, graphene coated ammonium dinitramide is obtained by placing the composite powder in low temperature reduction steam. Compared with the traditional ammonium dinitramide coating method, the invention does not need additional assistant, and the experiment is simple and easy to operate. The morphology and thickness of the graphene coating prepared by 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...

Claims

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Application Information

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IPC IPC(8): C06D5/00C06B23/00C06B25/34C01B32/198
CPCC06B23/00C06B25/34C06D5/00C01B32/198
Inventor 闫宁边城李宏岩汪营磊时艺娟张艳
Owner XIAN MODERN CHEM RES INST
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