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Nano boron fuel subjected to surface passivation by adopting perfluoroalkanoic acid and preparation method of nano boron fuel

A perfluoroalkanoic acid and fuel technology, which is applied in non-explosive desensitizers/passivators, offensive equipment, explosives, etc., can solve the problems of poor stability of energetic materials and achieve improved storage stability and high storage stability , The effect of simple preparation process

Active Publication Date: 2022-02-25
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of acid will lead to the problem of poor long-term storage stability of energetic materials, and it cannot be used as the main source of oxidizing elements in composite energetic materials. Therefore, the large-scale application of perfluoroalkanoic acid in energetic materials requires a lot of experiments. verify

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0030] According to a preferred embodiment of the present invention, the micro-nano boron fuel is prepared by a method comprising the following steps:

[0031] (1) dissolving the perfluoroalkanoic acid in an organic solvent without oxidizing groups to obtain a saturated solution;

[0032] (2) placing the micro-nano boron powder without an oxide layer on the surface in the saturated solution, and ultrasonically vibrating to obtain a homogeneous suspension;

[0033] (3) The suspension is placed in a vacuum rotary evaporator for vacuum rotary evaporation, part of the solvent is distilled off, part of the perfluoroalkanoic acid is precipitated, and the remaining suspension is filtered and dried to obtain the surface of the perfluoroalkanoic acid. Passivated micro-nano boron fuel;

[0034] The organic solvent without oxidizing groups is preferably acetonitrile.

[0035] The method of the present invention may also include recovering and reusing the distilled solvent and remaining...

Embodiment 1

[0065] This example is used to illustrate a micro-nano boron fuel surface passivated by perfluoroalkanoic acid and its preparation method according to the present invention.

[0066] The micro-nano boron fuel is a composite fuel made by coating the micro-nano boron powder uniformly dispersed therein in a saturated solution of the perfluoroalkanoic acid in an organic solvent without oxidizing groups, and its composition is : 96 parts of 50-80 nanometer boron powder, 4 parts of perfluorotetradecanoic acid.

[0067] The preparation method of the micro-nano boron fuel mainly comprises the following steps:

[0068] (1) Boiling the commercially available nano boron powder through distilled water, so that the boron oxide on the surface forms a hydration layer;

[0069] (2) Repeat washing 4 times with distilled water to remove the hydration layer;

[0070] (3) adopt acetonitrile to wash boron powder, obtain the boron powder without oxidation layer, anhydration layer;

[0071] (4) P...

Embodiment 2

[0077] This example is used to illustrate a micro-nano boron fuel surface passivated by perfluoroalkanoic acid and its preparation method according to the present invention.

[0078] The micro-nano boron fuel is a composite fuel made by coating the micro-nano boron powder uniformly dispersed therein in a saturated solution of the perfluoroalkanoic acid in an organic solvent without oxidizing groups, and its composition is : 99 parts of 13±2 micron ultrafine boron powder, 1 part of perfluorooctanoic acid.

[0079] The preparation method of the micro-nano boron fuel mainly comprises the following steps:

[0080] (1) Boil the commercially available micron boron powder through distilled water to make the surface boron oxide form a hydration layer;

[0081] (2) Repeat washing twice with distilled water to remove the hydration layer;

[0082] (3) adopt acetonitrile to wash boron powder, obtain the boron powder without oxidation layer, anhydration layer;

[0083] (4) Preserve the ...

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Abstract

The invention discloses a micro-nano boron fuelsubjected to surface passivation by adopting perfluoroalkanoic acid and a preparation method thereof. The micro-nano boron fuel comprises micro-nano boron powder without an oxide layer on the surface and perfluoroalkanoic acid wrapping the micro-nano boron powder, and based on the total weight of the micro-nano boron fuel, the content of boron in the micro-nano boron fuel is 96-99% by weight, and the content of perfluoroalkanoic acid is 1-4 wt%. The nano boron fuel subjected to surface passivation by adopting the perfluoroalkanoic acid has the advantages of high active ingredient content, high storage stability in air, complete energy release, simple preparation process, wide application range and the like. The residual solution and the solvent in the preparation method of the perfluoroalkanoic acid surface passivated micro-nano boron fuel disclosed by the invention can be recycled, and the preparation method is simple, safe and green.

Description

technical field [0001] The invention relates to a highly active nano-boron fuel without an oxide layer, in particular to a micro-nano boron fuel surface passivated by perfluoroalkane acid and a preparation method thereof. Background technique [0002] Boron is an important high-energy-density fuel in the field of energetic materials, and its theoretical combustion heat can reach 57.9kJ / g, which is 1.8 times that of the most commonly used aluminum (~31.8kJ / g) fuel. Therefore, adding boron powder to energetic materials is an effective measure to improve the energy index of composite energetic materials. However, boron powder has problems such as low reaction completion and low reaction rate during the detonation or combustion process of energetic materials, and the dense condensed passivation layer produced by oxidation will prevent its further oxidation, which restricts the theoretical energy storage of energetic materials. release. In addition, due to the high viscosity of...

Claims

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Application Information

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IPC IPC(8): C06B27/00C06B23/00
CPCC06B27/00C06B23/005Y02E30/30
Inventor 欧亚鹏焦清介王芳
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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