Continuous preparation system and method for smokeless fireworks

A preparation system and technology for fireworks, applied in explosives processing equipment, explosives, offensive equipment, etc., can solve the problems of poor uniformity of particle internal pore size distribution, thick smoke, and low production efficiency, so as to avoid particle agglomeration and process The effect of improving safety and productivity

Inactive Publication Date: 2015-11-25
NANJING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0002] The use of smokeless gunpowder such as single-base powder as fireworks has the disadvantages of low apparent burning rate and fire transfer rate under normal pressure and low pressure conditions, and cannot completely replace black powder. In many cases, it is mixed with black powder and used Can not completely solve the problem of thicker smoke
[0003] The smokeless powder containing nitrocellulose is completely dissolved by the solvent method and then remolded to prepare smokeless fireworks with a microporous structure. The burning speed and fire transmission speed are greatly improved, but the existing process is an intermittent process, and the product The stability is not ideal, the equipment is huge, and the production efficiency is low
Batch-type preparation of smokeless fireworks with a microporous structure has a large stock of WIP, although most of the process is completed in the presence of water, there are still certain safety hazards
[0004] In addition, the preparation method of smokeless fireworks with microporous structure has been publicly reported. The finished particles can only be completely shaped after the solvent distillation is removed. The particles are prone to agglomeration in the early stage of solvent distillation. Defects such as poor uniformity of internal pore size distribution make the process control more difficult, which is not conducive to the improvement of product stability and quality

Method used

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  • Continuous preparation system and method for smokeless fireworks
  • Continuous preparation system and method for smokeless fireworks

Examples

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preparation example Construction

[0027] A method for continuously preparing smokeless fireworks anthers utilizing the above system, comprising the following steps:

[0028] (1) Step 1 is a material dissolving process. Under stirring, the energetic polymer material containing nitrocellulose is dissolved into a solvent to form a polymer sol. The energetic polymer material is one of nitrocellulose, single-base drug, and double-base drug with a nitrogen content greater than or equal to 11.5%, which can be called a raw material drug. Firstly, the energetic polymer material containing nitrocellulose is added to a material dissolving tank or a pelletizing reactor, and an ethyl acetate solvent 3.0 to 20 times the mass of the raw material drug is added to dissolve the material. Under the stirring state, the raw material drug is dispersed and dissolved to form a polymer sol. The dissolution time of the material is determined according to the type of raw material and the particle size, and the dissolution time is 10-90...

Embodiment 1

[0036] Four peristaltic pumps are used as the continuous conveying equipment for liquid materials, two of which respectively convey polymer emulsion and oxidant aqueous solution to the emulsifier, and the materials treated by the emulsifier are connected to the dynamic mixer through pipelines, and the aqueous solution containing dispersant is used for the first Three peristaltic pumps are sent to the other inlet of the dynamic mixer. The outlet of the dynamic mixer is connected to an inlet of the static mixer through a delivery pipeline. The aqueous solution containing oxidant is sent to the other inlet of the static mixer by a peristaltic pump. The pipeline is made of silicone tube, and the dynamic mixer is made of glass flat-bottomed airtight container, with a magnetic stirrer installed inside, driven by a magnetic stirring system outside, with adjustable speed, and a centrifugal device for solid-liquid separation of materials.

[0037] Select nitrogen content as the nitrocel...

Embodiment 2

[0043] Using the basic process conditions similar to Example 1, only the concentration and feed flow ratio of some materials were changed. The nitrocellulose with a nitrogen content of 11.5% N is used as a raw material to form balls, the solvent ratio is 10 times, gum arabic is used as a dispersant, the concentration of the dispersant is 0.5%, and the aqueous solution contains OP-10 non-ionic surfactant. The surfactant concentration is 0.02%, the temperature of the material is maintained at 20-30° C., and other preparation conditions are the same as in Example 1. The particle size of the obtained smokeless fireworks anther particles is concentrated in the range of 0.2-1.0mm, and the SEM observation picture of a typical particle slice is shown in Figure 4 shown.

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Abstract

The invention discloses a continuous preparation system and method for smokeless fireworks. The method comprises the steps of firstly dissolving an energy-containing macromolecular material containing nitrocotton in ethyl acetate to obtain a macromolecular sol containing nitrocotton; continuously conveying the macromolecular sol and an aqueous solution containing an oxidant in parallel and emulsifying the sol and the aqueous solution by an emulsifier; then conveying an macromolecular emulsion output at the outlet of the emulsifier and an aqueous solution containing a dispersant in parallel; continuously dispersing the mixture in a dynamic mixer, thereby forming the macromolecular emulsion into spherical liquid drops; conveying the dispersed material to a static mixer through a continuous conveying device to be mixed with the aqueous solution containing the oxidant, wherein the spherical liquid drops are gradually hardened in the conveying process to form solid particles; and carrying out solid-liquid separation and drying on the solid particles to obtain the smokeless firework particles. The method has the characteristics of being high in efficiency, stable in finished product performance, and simple to operate and being safe and environmental-friendly, and is suitable for preparing the smokeless firework particles in a large scale.

Description

technical field [0001] The invention belongs to the technical field of energetic composite materials, in particular to a continuous preparation system and method for smokeless fireworks anther medicine. Background technique [0002] The use of smokeless gunpowder such as single-base powder as fireworks has the disadvantages of low apparent burning rate and fire transfer rate under normal pressure and low pressure conditions, and cannot completely replace black powder. In many cases, it is mixed with black powder and used Can not completely solve the problem of thicker smoke. [0003] The smokeless powder containing nitrocellulose is completely dissolved by the solvent method and then remolded to prepare smokeless fireworks with a microporous structure. The burning speed and fire transmission speed are greatly improved, but the existing process is an intermittent process, and the product The stability of the machine is not ideal enough, the equipment is huge, and the product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B21/00C06B25/00
Inventor 蔺向阳郑文芳李权威潘仁明黄振亚
Owner NANJING UNIV OF SCI & TECH
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