Method for coating energetic crystal surfaces

A technology of surface coating and crystal, which is applied in the direction of non-explosive/non-thermal agent components, explosives processing equipment, nitrated acyclic/alicyclic/heterocyclic amine explosive composition, etc., can solve the problem of limited coating strength and achieve The effect of high-efficiency coating

Active Publication Date: 2016-07-20
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the coating strength achieved by this method is limited

Method used

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  • Method for coating energetic crystal surfaces
  • Method for coating energetic crystal surfaces
  • Method for coating energetic crystal surfaces

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A coating method for HMX energetic crystals, comprising the following steps:

[0040] At room temperature, Tris was dissolved in a mixed solution of water and ethanol with a volume ratio of 9:1 to prepare a solution with a Tris concentration of 10 mM; then hydrochloric acid was added dropwise to prepare a buffer solution with a pH of 8.0 for use.

[0041] Then, dopamine hydrochloride is dissolved in the buffer solution, makes the dopamine hydrochloride solution that concentration is 1g / L;

[0042] Next, 10g HMX (average particle diameter is 60 μm) is added in the dopamine hydrochloride solution prepared in 200mL, and is stirred into uniform suspension under the stirring rate of 500rpm;

[0043] After continuing to stir for 6h, filter with suction and dry in vacuo.

[0044] The surface of the HMX crystal prepared in this example is completely covered. After high-performance liquid chromatography analysis, the coating amount of dopamine on the surface of the HMX crystal i...

Embodiment 2

[0047] A coating method for Octojin energetic crystals, comprising the following steps:

[0048] At room temperature, Tris was dissolved in a mixed solution of water and ethanol with a volume ratio of 9:1 to prepare a solution with a Tris concentration of 10 mM; then hydrochloric acid was added dropwise to prepare a buffer solution with a pH of 8.5 for use.

[0049] Then, dopamine hydrochloride is dissolved in the buffer solution, makes the dopamine hydrochloride solution that concentration is 2g / L;

[0050] Next, 10g HMX (average particle diameter is 10 μm) is added in the dopamine hydrochloride solution prepared in 200mL, and is stirred into uniform suspension under the stirring rate of 600rpm;

[0051] After continuing to stir for 6h, filter with suction and dry in vacuo.

[0052] The surface of the HMX crystal prepared in this example is completely covered. After high-performance liquid chromatography analysis, the coating amount of dopamine on the surface of the HMX cry...

Embodiment 3

[0054] A coating method for TATB energetic crystals, comprising the following steps:

[0055] At room temperature, Tris was dissolved in a mixed solution of water and ethanol with a volume ratio of 9:1 to prepare a solution with a Tris concentration of 10 mM; then hydrochloric acid was added dropwise to prepare a buffer solution with a pH of 9.5 for use.

[0056] Then, dopamine hydrochloride is dissolved in the buffer solution, makes the dopamine hydrochloride solution that concentration is 2.5g / L;

[0057] Next, 10gTATB (average particle diameter is 5 μm) is added in the dopamine hydrochloride solution prepared in 200mL, and is stirred into a uniform suspension under the stirring rate of 800rpm;

[0058] After continuing to stir for 3h, filter with suction and dry in vacuum.

[0059] As a comparison, image 3 is the SEM image of untreated TATB crystals. Figure 4 It is the coated TATB crystal. like Figure 4 As shown, the surface of the prepared TATB crystal is completel...

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Abstract

The invention discloses a method for coating energetic crystal surfaces. Coating of the energetic crystal surfaces is achieved through oxidation-self-polymerization of dopamine under the condition of a weakly alkaline aqueous solution and formation of poly-dopamine coatings powerfully adhering to material surfaces. The method comprises the following steps: dissolving Tris in a mixed solution of water and ethanol in a volume ratio of 9 to 1 and then dropwise adding hydrochloric acid to prepare a buffer solution with the pH value of 8.0-10.0; then dissolving dopamine in the buffer solution to prepare a dopamine solution with the concentration of 1-5g / L; then adding a proper amount of energetic crystal to the dopamine solution and stirring the materials at a stirring rate of 200-900rpm to form uniform suspension; and continuously stirring the suspension for a period of time and then carrying out suction filtration and vacuum drying. The method has the beneficial effects that coating of the energetic crystal surfaces is completed in the aqueous phase, so the method is green and safe; and especially, the method can achieve efficient coating aiming at the energetic crystal surfaces with different characteristics.

Description

technical field [0001] The invention relates to the field of energetic materials, in particular to a method for covering the surface of energetic crystals. Background technique [0002] Energetic crystals belong to an important class of organic small molecule crystal materials, which contain explosive functional groups in their molecular structures, which can react rapidly and release a large amount of gas and heat. In the civil and military fields, such materials are widely used as the main components in explosives, propellants, and pyrotechnic materials. Since energetic crystals are in a powder state, they cannot be directly applied in practice. Therefore, it is necessary to coat energetic crystals. Polymer bonded explosives are the most common method of disposal. However, due to the low surface coating degree and coating strength of energetic crystals in polymer bonded explosives, the comprehensive performance of materials in the process of preparation and use is serio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B21/00C06B23/00C06B25/34
CPCC06B21/0083C06B23/009C06B25/34
Inventor 巩飞艳刘小兵杨志剑李玉斌
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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