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Method for preparing explosive/aluminum powder core-shell structure spherical composite based on pickering emulsion method

A core-shell structure and composite technology, applied in the field of material composites, can solve problems such as the problem of uniform mixing, and achieve the effect of increasing safety performance and reducing sensitivity

Active Publication Date: 2021-07-02
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still a technical problem to realize the uniform mixing of the two

Method used

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  • Method for preparing explosive/aluminum powder core-shell structure spherical composite based on pickering emulsion method
  • Method for preparing explosive/aluminum powder core-shell structure spherical composite based on pickering emulsion method
  • Method for preparing explosive/aluminum powder core-shell structure spherical composite based on pickering emulsion method

Examples

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Effect test

Embodiment 1

[0028] A method for preparing explosives / Al powder core-shell structure spherical composite based on pickering emulsion method, comprising the following steps:

[0029] Step 1: Add 10g of nano-Al powder into 100mL of ethanol, ultrasonically disperse, add 0.1g of polyvinyl alcohol, slowly add 200mL of cyclohexane dropwise while stirring, centrifuge and dry after 30 minutes of reaction to obtain polyvinyl alcohol-modified nano Al powder, the HLB value is 13.8; the speed of dripping cyclohexane is 2mL / min; the power of ultrasonic is 300W, and the frequency is 45kHz; the speed of the stirring is 150r / min;

[0030] Step 2. Dissolve 2g of CL-20 in 10mL of ethyl acetate, then add 0.2g of polyvinyl alcohol-modified nano-Al powder, add 50mL of distilled water after 10 minutes, and emulsify mechanically for 5 minutes to obtain an emulsion; then add 300mL of it dropwise to the system Distilled water, filtered and dried to obtain Al / CL-20 spherical composite; the stirring speed of the mec...

Embodiment 2

[0033] A method for preparing explosives / Al powder core-shell structure spherical composite based on pickering emulsion method, comprising the following steps:

[0034] Step 1. Add 10g of nano-Al powder to 120mL of ethanol, ultrasonically disperse, add 0.1g of polyvinyl alcohol, slowly add 200mL of cyclohexane dropwise while stirring, centrifuge and dry after 30 minutes of reaction to obtain polyvinyl alcohol-modified nano Al powder; the HLB value is 13.6; the speed of dripping cyclohexane is 5mL / min; the power of ultrasonic is 300W, and the frequency is 60kHz; the speed of stirring is 300r / min;

[0035] Step 2. Dissolve 2g of CL-20 in 10mL of ethyl acetate, then add 0.3g of polyvinyl alcohol-modified nano-Al powder, add 50mL of distilled water after 10 minutes, and mechanically emulsify for 5 minutes to obtain an emulsion; then add 300mL of it dropwise to the system Distilled water, filtered and dried to obtain Al / CL-20 spherical composite; the stirring speed of the mechanica...

Embodiment 3

[0038] A method for preparing explosives / Al powder core-shell structure spherical composite based on pickering emulsion method, comprising the following steps:

[0039] Step 1. Add 10g of nano-Al powder to 120mL of ethanol, ultrasonically disperse, add 0.1g of polyvinyl alcohol, slowly add 200mL of cyclohexane dropwise while stirring, centrifuge and dry after 30 minutes of reaction to obtain polyvinyl alcohol-modified nano Al powder, the HLB value is 13.7; the speed of dripping cyclohexane is 5mL / min; the power of ultrasonic is 300W, and the frequency is 60kHz; the speed of the stirring is 300r / min;

[0040] Step 2. Dissolve 2 g of CL-20 and 2,4,6-trinitrotoluene with a mass ratio of 1:1 in 10 mL of ethyl acetate, then add 0.3 g of polyvinyl alcohol-modified nano-Al powder, and after 10 min Add 50mL of distilled water and perform mechanical emulsification for 5 minutes to obtain an emulsion; then add 300mL of distilled water dropwise to the system, filter and dry to obtain an ...

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Abstract

The invention discloses a method for preparing an explosive / Al powder core-shell structure spherical composite based on a pickering emulsion method, comprising: modifying or modifying the nano-Al powder at the interface, adjusting its HLB value, and obtaining the modified nano-Al powder; Add simple explosives to solvent A, add modified nano-Al powder after dissolving, add non-solvent B after stirring, ultrasonically or mechanically emulsify to form an emulsion, then add non-solvent C or heat up to crystallize the explosives, obtain a solid-liquid mixture and filter , washing, and drying to obtain explosives / Al powder core-shell structure spherical composite; the present invention modifies and coats the surface of nano-aluminum powder, which can reduce its sensitivity and effectively reduce its continued oxidation on the one hand, and on the other hand, can change Its HLB value enables it to be used as a surfactant for pickering emulsions, and finally obtains Al / dynamite spherical composites with a shell-core structure.

Description

technical field [0001] The invention belongs to material compounding technology, in particular to a method for preparing explosive / aluminum powder core-shell structure spherical compound based on a pickering emulsion method. Background technique [0002] Modern national defense and weapon systems put forward higher requirements on the energy output of energetic materials, and one of the effective ways to increase the energy of weapon systems is to add high-energy components to the formula, among which high-energy explosives and metal aluminum powder are relatively Ideal additive. Metal Al powder has high calorific value and density, which can effectively increase energy in explosives and propellant formulations, and is currently the most widely used metal additive. [0003] In order to improve the energy of solid propellants, magnesium, aluminum, boron and other metals are often used as high-energy additives, which can increase the mass specific impulse and volume specific ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C06B21/00C06B45/22C06B33/08C06D5/06
CPCC06B21/0083C06B33/08C06B45/22C06D5/06
Inventor 郭长平李玥其叶平翟恒段晓慧田璐
Owner SOUTHWEAT UNIV OF SCI & TECH
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