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Continuous preparation system and method of energetic polymer microspheres

A polymer microsphere and polymer technology, which is used in offensive equipment, nitrification explosive components, and explosive processing equipment, etc., can solve the problem that spherical droplets are prone to deformation or agglomeration, affecting the compactness of propellant grains, and adverse product stability. and quality problems, to achieve the effect of increased spherical rate, low equipment cost and stable quality of finished products

Active Publication Date: 2014-05-14
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The disadvantage of this preparation method is that the spherical droplets are prone to deformation or agglomeration during the solvent distillation process, and a large number of pores may be generated inside the particles, which will affect the compactness of the propellant grain
In addition, the process technology of continuous preparation of spherical medicine has also been developed, but the material transportation process is changed into a continuous operation process, which cannot avoid the above-mentioned problems such as particle deformation and internal pores in the solvent distillation process.
[0004] At present, the preparation methods of energetic polymer microspheres that have been publicly reported all need to be formed into spheres under heating conditions, and the spherical particles can be completely shaped after the solvent is driven out. The difficulty of process control is relatively large, which is not conducive to product stability and quality. improvement

Method used

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  • Continuous preparation system and method of energetic polymer microspheres
  • Continuous preparation system and method of energetic polymer microspheres
  • Continuous preparation system and method of energetic polymer microspheres

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preparation example Construction

[0020] A method for continuously preparing energetic polymer microspheres utilizing the above system, comprising the following steps:

[0021] Step 1, dissolving the energetic polymer material containing nitrocellulose into ethyl acetate to form a polymer sol containing nitrocellulose; the energetic polymer material containing nitrocellulose is a nitrated nitrate with a nitrogen content greater than or equal to 11.5%. Cotton, single-base drug, double-base drug or modified double-base drug containing high-energy explosive; the amount of ethyl acetate is 2.0-50 times the mass of the energetic polymer material.

[0022] Step 2, transport the polymer sol containing nitrocellulose and the aqueous solution containing surfactant and dispersant in parallel, and carry out continuous mixing and dispersion in the dynamic mixer, and the polymer sol is dispersed into spherical droplets; the surface in the aqueous solution The mass concentration of active agent is 0.002-0.5%, and described ...

Embodiment 1

[0034] Three peristaltic pumps are used as continuous conveying equipment for liquid materials, two of which respectively convey the polymer sol and the aqueous solution containing dispersant to the two inlets of the dynamic mixer, and the outlet of the dynamic mixer passes through the conveying pipeline and the static mixer. One inlet is connected, and the aqueous solution containing dehydrating agent is transported to the other inlet of the static mixer by a third peristaltic pump. The delivery pipeline is made of silicone tube, and the dynamic mixer is made of a glass flat-bottomed airtight container with a magnetic stirrer inside. The external drive is driven by a magnetic stirring system, the speed is adjustable, and the solid-liquid separation of the material adopts a centrifugal device.

[0035] The nitrogen content that contains 35% moisture is selected to be the nitrocellulose of 11.5% as raw material drug, the wet nitrocellulose is added in the dissolving tank, the et...

Embodiment 2

[0040] The continuous preparation of energetic polymer microspheres was carried out using the basic process conditions similar to those in Example 1, only the concentration of some materials and the ratio of feed flow rate were changed. Similarly, the nitrocellulose with a nitrogen content of 11.5%N is used as a raw material, the solvent ratio is 20 times, gum arabic is used as a dispersant, the concentration of the dispersant is 0.5%, and the aqueous solution contains OP-10 type nonionic surfactant. Surfactant concentration is 0.2%, and other preparation conditions are with embodiment 1. The obtained energetic polymer microspheres have an average particle diameter of 15.8 microns, and the appearance of the particles is as follows: Figure 4 As shown, the particle size distribution is as follows Figure 5 shown.

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Abstract

The invention discloses a continuous preparation method for energetic polymer microspheres. The method comprises the following steps: dissolving an energetic polymer material containing nitrocotton in ethyl acetate at room temperature to obtain a polymer sol containing the nitrocotton; then continuously conveying the polymer sol and an aqueous solution containing a dispersing agent in parallel to mix in a dynamic mixer for dispersing; continuously dispersing the polymer sol to form spherical liquid drops; conveying the mixed material to a static mixer through a continuous conveying device to continuously mix with the aqueous solution containing a dehydrating agent or mother liquor recycled by a solvent; hardening the spherical liquid drops gradually in a conveying process to form energetic polymer particles; and separating and drying the energetic polymer particles to obtain energetic polymer microspheres. The method has the characteristics of high preparation efficiency, stable finished product performance, easy and convenient operation, safety and environment friendliness and is applicable to batch preparation of a variety of micron-scale and submicron-scale energetic polymer microspheres containing nitrocotton.

Description

technical field [0001] The invention belongs to the technical field of energetic composite materials, in particular to a continuous preparation system and method of energetic polymer microspheres. Background technique [0002] Energetic polymer microspheres are one of the important basic materials for the manufacture of high-performance propellants. The size of energetic polymer microspheres directly affects the molding processability of propellants and the mixing uniformity of materials. Usually, the particle size of energetic polymer microspheres is mostly in the range of 1-100 microns. Typical energetic polymer microspheres are nitrocellulose microspheres. [0003] The traditional manufacturing method of energetic polymer microspheres is mainly produced by the discontinuous process. The typical process is to dissolve the energetic polymer material containing nitrocellulose into a solvent to obtain a polymer sol, and then mix the high polymer sol under stirring. The mole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B21/00C06B25/20C06B25/28
Inventor 蔺向阳高玉猛赵芦奎王萍胡乃鑫
Owner NANJING UNIV OF SCI & TECH
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