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Method for preparing superhydrophobic spherical ADN (ammonium dinitramide) based on interfacial tension

A technology of ammonium dinitramide and interfacial tension, which can be used in explosives and other directions, can solve the problems of few reports on energetic materials, and achieve the effects of mild experimental conditions, high product quality and simple operation.

Active Publication Date: 2019-01-04
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Superhydrophobic technology is a bionic technology developed by simulating the surface structure of lotus leaves in the past ten years. There are few reports on the anti-moisture absorption of energetic materials

Method used

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  • Method for preparing superhydrophobic spherical ADN (ammonium dinitramide) based on interfacial tension

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing superhydrophobic spherical dinitramide ammonium based on interfacial tension, comprising the following steps:

[0026] Step 1. Heat up 1g of ammonium dinitramide to 95°C for melting, then use electrostatic spray to spray the molten ammonium dinitramide onto 0.2g of nano-sized polyvinylidene fluoride; the injection speed of the injection pump used in the electrostatic spray is 5mL / h, the electrostatic spray voltage is 15kV, and the distance from the nozzle to nano-scale polyvinylidene fluoride is 10cm;

[0027] Step 2. After the ammonium dinitramide crystal surface is coated with a layer of polyvinylidene fluoride, the temperature is lowered to 20°C at a rate of 2°C / min to solidify and crystallize to obtain a superhydrophobic spherical ammonium dinitramide;

[0028] The hygroscopicity test (adopting GJB770A-97 standard) is carried out to the untreated ammonium dinitramide crystal and the superhydrophobic spherical ammonium dinitramide prepared, and...

Embodiment 2

[0030] A method for preparing superhydrophobic spherical dinitramide ammonium based on interfacial tension, comprising the following steps:

[0031] Step 1. Heat 1g of ammonium dinitramide to 95°C for melting, then use electrostatic spray to spray the molten ammonium dinitramide onto 0.1g of nano-sized polytetrafluoroethylene powder; the injection speed of the injection pump used in the electrostatic spray is 5mL / h, the electrostatic spray voltage is 15kV, and the distance from the nozzle to nano-scale polyvinylidene fluoride is 10cm;

[0032]Step 2: After the ammonium dinitramide crystal surface is coated with a layer of polytetrafluoroethylene, the temperature is lowered to 20°C at a rate of 5°C / min to solidify and crystallize to obtain a superhydrophobic spherical ammonium dinitramide.

[0033] The hygroscopicity test (adopting GJB770A-97 standard) is carried out to the untreated ammonium dinitramide crystal and the superhydrophobic spherical ammonium dinitramide prepared, ...

Embodiment 3

[0035] A method for preparing superhydrophobic spherical dinitramide ammonium based on interfacial tension, comprising the following steps:

[0036] Step 1. Warm up 5g ammonium dinitramide to 95°C for melting, then use electrostatic spray to spray the molten ammonium dinitramide onto 0.5g nano-sized polytetrafluoroethylene powder; the injection speed of the injection pump used in the electrostatic spray is 8mL / h, the electrostatic spray voltage is 18kV, and the distance from the nozzle to nano-scale polyvinylidene fluoride is 15cm;

[0037] Step 2: After the ammonium dinitramide crystal surface is coated with a layer of polytetrafluoroethylene, the temperature is lowered to 20°C at a rate of 5°C / min to solidify and crystallize to obtain a superhydrophobic spherical ammonium dinitramide.

[0038] The hygroscopicity test (adopting GJB770A-97 standard) is carried out to the untreated ammonium dinitramide crystal and the superhydrophobic spherical ammonium dinitramide prepared, an...

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Abstract

The invention discloses a method for preparing superhydrophobic spherical ADN (ammonium dinitramide) based on interfacial tension. The method comprises the following steps: step one, melting an ADN crystal and spraying the crystal onto a low surface energy material; step two, after the surface of the ADN crystal is coated with a layer of low surface energy material, performing cooling to solidifyand crystallize the ADN crystal to obtain superhydrophobic spherical ADN. Super-hydrophobic concept and spheroidization for reducing hygroscopicity of ADN are combined, the super-hydrophobic sphericalADN crystal is prepared with a solid-phase melting method, the particle size is adjustable, hygroscopicity of the superhydrophobic spherical ADN crystal is greatly reduced, no liquid solvent or non-solvent is used in the main process, the method is green and environmentally friendly, the process is simple, and the cost is low; especially, under the conditions that the temperature is 60 DEG C, therelative humidity is 80% and test time is 400 hours, the moisture absorption rate of superhydrophobic spherical AND is reduced by 55% as compared with ADN raw materials and is much higher than that of other reported ADN moisture absorption prevention methods. Therefore, a technical route is provided for wide application of ADN in solid propellants.

Description

technical field [0001] The invention belongs to the anti-hygroscopic technology of hygroscopic inorganic oxidants, in particular to a method for preparing superhydrophobic spherical ammonium dinitramide based on interfacial tension. Background technique [0002] Ammonium dinitramide (ADN) is a new type of energetic oxidant with a density of 1.8g / cm3 and a melting point between 92°C and 95°C. ADN has the characteristics of no chlorine in the molecular structure, high oxygen and nitrogen content, high density, and high oxygen balance, which overcomes the shortcomings of traditional oxidants such as ammonium perchlorate (AP) and ammonium nitrate (AN) in these properties. Using ADN instead of AP can increase the energy of solid propellant by 5%-10%, and at the same time reduce the emission of harmful gases such as hydrogen chloride and protect the environment. The oxidizer can be used not only for small surface-to-air missiles, but also for boosters of intercontinental missiles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B45/00
CPCC06B45/00
Inventor 郭长平田璐王敦举王瑞浩冀威王茜刘珉杨光成
Owner SOUTHWEAT UNIV OF SCI & TECH
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