Surface modification and coating method for ammonium dinitramide

A technology of ammonium dinitramide and surface modification, which is applied in the direction of nitrated acyclic/alicyclic/heterocyclic amine explosive composition, etc., can solve the problem of reducing the moisture absorption rate of ADN, and achieve the effect of improving the moisture absorption problem

Inactive Publication Date: 2014-06-25
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to overcome the deficiencies and defects in the background technology and provide a method for modifying

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Add 5g ammonium dinitramide, 50g polystyrene toluene solution (viscosity 20 centipoise) and 0.05g trimethoxysilane into the reaction flask, control the stirring speed at 500rpm, heat to 92°C, keep it warm for 5min, and make the two The ammonium nitrate is completely melted and evenly dispersed in the medium, the temperature is rapidly cooled in an ice-water bath, solid particles are precipitated, and the surface-modified ammonium dinitramide particles are obtained by filtration. The obtained surface-modified and coated ammonium dinitramide particles have a saturated moisture absorption rate of 0.57% at a relative humidity of 50% and a temperature of 35°C.

Embodiment 2

[0013] Add 5g of ammonium dinitramide, 50g of polystyrene toluene solution (viscosity of 40 centipoise) and 0.1g of trimethoxysilane into the reaction flask, control the stirring speed at 600rpm, heat to 92°C, keep it warm for 5min, and make the two The ammonium nitrate is completely melted and evenly dispersed in the medium, the temperature is rapidly cooled in an ice-water bath, solid particles are precipitated, and the surface-modified ammonium dinitramide particles are obtained by filtration. The obtained surface-modified ammonium dinitramide particles have a saturated moisture absorption rate of 0.58% under the conditions of a relative humidity of 50% and a temperature of 35°C.

Embodiment 3

[0015] Add 5g of ammonium dinitramide, 50g of polystyrene toluene solution (viscosity of 60 centipoise) and 0.025g of trimethoxysilane into the reaction flask, control the stirring speed at 300rpm, heat to 92°C, keep warm for 5min, and make the two The ammonium nitrate is completely melted and evenly dispersed in the medium, the temperature is rapidly cooled in an ice-water bath, solid particles are precipitated, and the surface-modified ammonium dinitramide particles are obtained by filtration. The obtained surface-modified and coated ammonium dinitramide particles had a saturated moisture absorption rate of 2.22% under the conditions of a relative humidity of 50% and a temperature of 35°C.

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Abstract

The invention discloses a surface modification and coating method for ammonium dinitramide, in order to solve a problem on moisture absorption in a process of using the ammonium dinitramide. The method comprises the following steps: adding ammonium dinitramide, a dispersion medium and a surface modification and coating agent in a reaction flask, heating until the ammonium dinitramide is completely melted, decreasing temperature and separating out solid particles, and filtering to obtain surface-modified and coated ammonium dinitramide particles. Under conditions that relative humidity is 50% and temperature is 35 DEG C, after modification and coating, a saturated moisture rate of the ammonium dinitramide is reduced by 85%, and thus a problem on moisture absorption of the ammonium dinitramide is effectively solved. According to the method disclosed by the invention, not only is moisture absorption of the ammonium dinitramide effectively improved, but also an ammonium dinitramide crystal can be pelletized.

Description

technical field [0001] The invention relates to a surface modification coating method of ammonium dinitramide. Background technique [0002] Ammonium dinitramide (ADN) is a new type of oxidant, its molecule contains both oxidant and fuel components, with high oxygen content and a heat of formation of -148.5~-149.8kJ / mol, which can be used as both explosives and solid propulsion oxidizing agents. However, the synthesized ADN is generally in the form of flaky or needle-like crystals, which are easy to agglomerate and affect the rheological properties of the slurry and the combustion performance of the propellant. The crystalline ADN prepared by the commonly used recrystallization method has the disadvantages of many crystal defects, easy moisture absorption, and high sensitivity. These disadvantages limit the application of ADN in propellants and gas generators. [0003] T.Heintz and U.Teipel of Germany proposed two coating methods to improve the hygroscopicity of ADN. The...

Claims

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Application Information

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IPC IPC(8): C06B25/34
Inventor 姬月萍陈斌栗磊葛忠学刘卫孝汪伟汪营磊高福磊刘亚静丁峰卢先明莫洪昌张丽洁姚逸伦
Owner XIAN MODERN CHEM RES INST
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