Micro-pore firework powder capable with improved fire ignition and transfer properties and preparation method thereof

A micro-porosity and performance technology, applied in explosives, offensive equipment, nitrification explosive components, etc., can solve the problems of no hot solid products, low ignition and fire transfer ability, etc., and achieve the effect of improving fire transfer speed and ignition ability.

Active Publication Date: 2012-11-14
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The raw material used in the preparation of the micropore fireworks drug is scrap military smokeless powder containing nitrocellulose. During the combustion process, the amount of gas generated per unit mass of the powder is much higher than that of traditional black powder, but since the combustion products are almost all gas , there is no hot solid product, the ignition and fire transfer ability is lower than that of black powder

Method used

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  • Micro-pore firework powder capable with improved fire ignition and transfer properties and preparation method thereof
  • Micro-pore firework powder capable with improved fire ignition and transfer properties and preparation method thereof

Examples

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preparation example Construction

[0010] A method for preparing a microporous firework drug with improved point-to-fire performance, comprising the following steps: first dissolving materials, emulsifying and foaming, forming balls, then removing solvents, separating materials, and finally drying; dissolving and emulsifying materials When foaming, add the aqueous solution of the sensitizer; during the ball forming process, add the aqueous solution containing the sensitizer and the dispersant as the dispersion medium; the concentration of the aqueous solution of the sensitizer is the same. The sensitizer is one or more mixtures of nitrates and perchlorates of alkali metals or alkaline earth metals; it can be one of sodium nitrate, potassium nitrate, barium nitrate, strontium nitrate, sodium perchlorate, and potassium perchlorate one or a mixture of several. The concentration of the sensitizer in the sensitizer aqueous solution is 0.1-5.0%, and the mass of the sensitizer is 0.2-10% of the mass of the crude drug....

Embodiment 1

[0022] Single-base waste powder with a nitrocellulose content greater than 85% is used as the raw material drug. After preliminary crushing, the particle diameter is controlled to be no more than 3mm. The wet drug granules with water are added to the molding equipment, and 10 times the drug granules are added under stirring. High quality ethyl acetate solvent, stir and dissolve at 45°C-50°C for 30-60min, then continuously add 1% potassium nitrate aqueous solution to the system, potassium nitrate as a sensitizer; emulsify and foam under stirring Operation, in this step, continue to add 1% potassium nitrate aqueous solution, the amount of potassium nitrate aqueous solution added is 6 times the mass of the pellets, then continue to stir at 50-60°C for 30min-60min, and adjust the system temperature to 65 At -68°C, add 6 times the mass of the raw material drug containing dispersant and 1% potassium nitrate aqueous solution into the system to disperse into balls, gelatin is used as d...

Embodiment 2

[0024] Using the same process as in Example 1, adopting single-base waste gunpowder with a nitrocellulose content greater than 85% as a raw material, using potassium nitrate as a sensitizer, only dissolving and emulsifying foaming and using potassium nitrate as a ball-forming medium The concentration of the solution is all reduced to 0.1%, and the bulk density of the obtained sample is 0.21g.cm -3 . The test result of potassium nitrate content in the sample was 0.20%. The particle size is mainly concentrated in 300-2000um. After drying, the 20-40 mesh part is screened out, and the fire transmission speed is 35mm / s. Using a firework bomb with an inner diameter of 25mm, put 25 red bright beads and 3 grams of microporous powder into the explosion test to test the ignition rate of the bright beads. The ignition rate of the sample prepared by adding 0.1% potassium nitrate in the solution 48%.

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Abstract

The invention discloses a method for preparing micro-pore firework powder capable with improved the fire ignition and transfer properties, which comprises the following steps of: firstly, dissolving materials, emulsifying, foaming, balling, then removing a solvent, separating the materials, and finally, drying; when the materials are dissolved, emulsified and foamed, adding a water solution of a sensitizing agent; and adding a water solution containing a sensitizing agent and a dispersing agent as a dispersion medium in the balling process, wherein the concentration of the water solutions of the sensitizing agents is the same. The used sensitizing agents can adopt the nitrate, the perchlorate or the mixture thereof of alkali metal or alkali earth metal, and the addition proportion is 0.2 to 10 percent of the mass of raw powder. The sensitizing agents are added in the forming process of the micro-pore firework powder by the form of the water solutions, an extra procedure is not added, a forming medium is recycled in the technological process, environmental pollution and material wastage can not be caused, the distribution of the sensitizing agents in an obtained sample of a finished product is more uniform, and the ignition capability and the normal-pressure fire transfer speed are both enhanced obviously.

Description

technical field [0001] The invention belongs to the technology of fireworks propellant and fireworks shell opening, in particular to a micro-pore firework drug with improved ignition performance and a preparation method thereof. Background technique [0002] The main method of using scrapped military smokeless propellant as propellant for fireworks is to crush the waste propellant powder. Since the particle size of the crushed powder is too large, the effect is not ideal, but the waste propellant powder is crushed to a particle size below 100 mesh. It is relatively difficult and the production efficiency is low. In addition, there are defects such as the apparent burning rate and fire transmission speed under normal pressure and low pressure conditions are not high enough, and it cannot completely replace black powder. In many cases, it is mixed with black powder and cannot completely solve the smoke. thicker question. [0003] Solvent method is used to completely dissolve ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C06B25/20C06B25/28
Inventor 蔺向阳潘仁明郑文芳张学舜尚喜民阎斌
Owner NANJING UNIV OF SCI & TECH
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