Ammonium dinitramide with moisture-absorption-preventing coating layer and preparation method of ammonium dinitramide

A technology of ammonium dinitramide and coating layer, which is applied in the field of ammonium dinitramide with anti-moisture absorption coating layer and its preparation, and can solve the problems of poor compatibility of ADN particles and the like

Active Publication Date: 2021-07-06
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above technical requirements, the present invention proposes a kind of ammonium dinitramide with an anti-moisture-absorption coating layer and its preparation method, which solves the problem of poor compatibility between macromolecular prepolymers and ADN particles in the existing coating anti-moisture absorption method. The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 0.20g PAMMO, 0.10g BDDA and 10.0g spherical ADN (ADN particle size is 100-300μm) into a 500ml reaction bottle filled with 300g dichloromethane dispersion medium in turn, stir well and let stand for 30 minutes, then pour into Put 400g of n-hexane in a 1000ml three-necked reaction flask heated to 60°C to volatilize most of the dichloromethane in the dispersion medium, and then reflux at 65°C for 6 hours. After the reaction, cool down and filter to obtain PAMMO / BDDA-coated ADN particles. The saturated moisture absorption rate of the obtained cross-linked cured coated AND particles was 1.03% under the condition of relative humidity of 50% and temperature of 35°C.

Embodiment 2

[0035] Add 0.20g of PAMMO, 0.075g of BDDA and 10.0g of spherical ADN (100-300μm) into a 500ml reaction bottle containing 300g of dichloromethane dispersion medium in turn, stir well and let it stand for 30 minutes, then pour into 400g of n-hexane and In a 1000ml three-necked reaction flask heated to 60°C, most of the dichloromethane in the dispersion medium was volatilized, and then refluxed at 65°C for 6 hours. After the reaction, the temperature was lowered and filtered to obtain PAMMO / BDDA-coated ADN particles. The saturated moisture absorption rate of the obtained cross-linked and cured-coated AND particles is 0.65% under the conditions of a relative humidity of 50% and a temperature of 35°C.

Embodiment 3

[0037]Add 0.20g PAMMO, 0.055g BDDA and 10.0g spherical ADN (100-300μm) successively into a 500ml reaction bottle equipped with 300g dichloromethane dispersion medium, stir well and let stand for 30 minutes, then pour into 400g n-hexane and In a 1000ml three-necked reaction flask heated to 60°C, most of the dichloromethane in the dispersion medium was volatilized, and then refluxed at 65°C for 6 hours. After the reaction, the temperature was lowered and filtered to obtain PAMMO / BDDA-coated ADN particles. The saturated moisture absorption rate of the obtained cross-linked and cured-coated AND particles was 1.19% under the conditions of relative humidity of 50% and temperature of 35°C.

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Abstract

The invention discloses a preparation method of ammonium dinitramide with a moisture-absorption-preventing coating layer. The preparation method comprises the following steps: mixing an energetic macromolecular prepolymer, 1,4-butanediol diacrylate and ammonium dinitramide particles in dichloromethane, conducting uniform stirring, performing standing for 25-45 minutes, and then conducting mixing with n-hexane heated to 55-65 DEG C to obtain a mixture; and subjecting the mixture to a reflux reaction for 5-6 h at a temperature of 65-68 DEG C so as to obtain cross-linked, cured and coated ammonium dinitramide particles, wherein a mass ratio of ammonium dinitramide to dichloromethane to the energetic macromolecular prepolymer to 1,4-butanediol diacrylate to n-hexane is 1: 30: 0.02: (0.01-0.0055): 40. The compatibility between the coating layer and ADN is good, the safety of an ADN coating process can be greatly improved, and the saturation moisture absorption rate of the ADN with the moisture-absorption-preventing coating layer is only 0.65% under the conditions that relative humidity is 50% and temperature is 35 DEG C.

Description

technical field [0001] The invention belongs to the technical field of anti-moisture absorption of ammonium dinitramide, and in particular relates to an ammonium dinitramide with an anti-moisture coating layer and a preparation method thereof. Background technique [0002] Ammonium dinitramide (ADN) is an energetic material with excellent performance. It has become an important resource for the development of new high-energy, insensitive, low-signature, and environmentally friendly propellant and explosive products, and has become one of the research hotspots in the field of solid propellants in recent years. one. However, ADN has strong hygroscopicity, which has become a major reason for its wide application. The reasons for the moisture absorption of ADN mainly include the following aspects: on the one hand, because ADN itself is an inorganic salt that is very soluble in water, it has strong polarity, and there is a strong bond between its solid surface and water molecule...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B45/22C06B45/24C06B25/34C08J3/24C08L71/02C08K5/103
CPCC06B45/22C06B45/24C06B25/34C08J3/24C08J2371/02C08K5/103
Inventor 李娜赵凤起杨燕京李辉张明张建侃蒋周峰姜一帆
Owner XIAN MODERN CHEM RES INST
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