Microporous smokeless firework explosive and preparation method thereof

A microporous, smokeless propellant technology, applied in explosives, offensive equipment, nitrated explosive components, etc., can solve the problems of unsatisfactory combustion completeness and comprehensive performance, low apparent burning rate, large amount of smoke, etc., and achieve normal pressure Increased fire transfer rate and apparent burning rate, and reduced smoke volume

Active Publication Date: 2010-09-29
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Mixing waste military smokeless gunpowder powder with black powder does not solve the problem of large amount of smoke
Chinese patent CN1526687 discloses a smokeless propellant for fireworks, which is composed of decommissioned propellant powder, oxidant and combustibles, wherein the mass percentage of decommissioned propellant powder is 70-90%, and its preparation process is relatively simple, but its apparent burning rate Relatively low

Method used

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  • Microporous smokeless firework explosive and preparation method thereof
  • Microporous smokeless firework explosive and preparation method thereof
  • Microporous smokeless firework explosive and preparation method thereof

Examples

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preparation example Construction

[0016] The invention provides a preparation method of micro-pore smokeless fireworks medicine, which can prepare smokeless fireworks medicine containing nitrocellulose with high fire transfer rate and adjustable packing density and particle size.

[0017] combine figure 1 , the preparation method of microporous smokeless fireworks medicine of the present invention, the scrap military smokeless powder that contains nitrocellulose is dissolved in the solvent to form polymer sol, then forms lacquer-like emulsion through emulsification and foaming, and the lacquer is mixed under agitation The liquid-like emulsion is dispersed in a non-solvent medium to form balls, and then the anther of smokeless fireworks with a micropore structure is obtained after solvent removal, material separation and drying.

[0018] Wherein, the detailed process of the preparation method of the micropore smokeless fireworks medicine of the present invention is as follows:

[0019] (1) Material dissolutio...

Embodiment 1

[0033] A glass three-necked flask with a volume of 2 liters is selected as the ball-forming reactor, and single-base waste gunpowder with a nitrocellulose content greater than 85% is used as a raw material. After preliminary crushing, the diameter of the particles is controlled to be no more than 2 mm. Add the granules and water 1 times the mass of the granules into the reactor, add ethyl acetate solvent 10 times the mass of the granules under stirring, stir and dissolve at 45°C-50°C for 50-60min, the stirring speed Keep at 300-350rpm; carry out emulsification and foaming operation under stirring state, continuously add tap water to the system within 30min, the amount of water added is 6 times of the mass of the pills, after adding water, continue at 50-60℃ Continue to stir for 60 minutes; then adjust the temperature to 65°C-68°C, add an aqueous solution containing dispersant that is 8 times the mass of the raw material drug into the system to form balls, gelatin is used as a d...

Embodiment 2

[0035] Using the same single-base waste powder as in Example 1 as the bulk drug, the preparation process is the same as in Example 1, except that the amount of solvent added is reduced to 6 times the mass of the pellets, and the amount of water added during the emulsification and foaming operation is reduced to the mass of the pellets. 4 times of the obtained sample bulk density is 0.28g.cm -3 , the shape is oblate spherical, and the particle size is mainly concentrated in 300-2000μm. The appearance of the sample and the internal pore structure are as follows image 3 shown. Adopting the test method used in embodiment 1 to measure its fire transfer rate is 31.4mm / s. From image 3 It can be seen that the shape of the sample is close to spherical, and the interior contains a large number of pores with a wide distribution of pore size. It can be seen from the scale that most of the diameters of the pores are below 50 μm, and the pores are interconnected.

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Abstract

The invention discloses microporous smokeless firework explosive and a preparation method thereof. The preparation method comprises the following steps of: dissolving scrapped military smokeless explosive containing nitrated cellulose into a solvent to form macromolecular sol, emulsifying and foaming the sol to form paint emulsion, dispersing the paint emulsion into a non-solvent medium under stirring action to form balls, then driving the solvent, separating the materials, and drying the materials to obtain explosive particles with microporous structures on the inner part for emitting and dissecting fireworks. The smokeless firework explosive has high fire transfer rate and adjustable stacking density and particle size because of a large amount of microporous structures on the inner part, the appearance of the microporous smokeless firework explosive is approximately spherical or oblate, the particle size is controllable, the stacking density is 0.05 to 0.4 g/cm<3>, and the aperture of the inner part is 0.01 to 500 microns in variety.

Description

technical field [0001] The invention belongs to the technology of fireworks propellant and fireworks shell opening, in particular to a micropore smokeless fireworks drug and a preparation method thereof. Background technique [0002] In recent years, our country has made many achievements in the safe disposal and recycling of waste powder, which not only reduces the storage and treatment costs of waste powder, but also brings significant social and economic benefits. Some single-base propellants are applied to civilian explosives. The main method of utilization is to add waste propellant to explosives after mechanical crushing, so as to improve the comprehensive performance of explosives and reduce costs. However, this utilization method has a limited effect on the performance improvement of explosives. Yes, the energy efficiency is not too high. Therefore, how to more effectively utilize decommissioned gunpowder as a resource is of great significance for public safety and ...

Claims

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Application Information

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IPC IPC(8): C06B25/18C06B25/28
Inventor 蔺向阳潘仁明殷继刚郑文芳寇波尚喜民罗永光
Owner NANJING UNIV OF SCI & TECH
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