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Coating explosive microspheres prepared through emulsion solidification and preparation method thereof

A technology of explosives and emulsions, applied in the field of coated explosive microspheres and its preparation, can solve problems such as poor safety performance and incomplete coating, and achieve the effects of reduced sensitivity, good reproducibility, and simple process flow

Active Publication Date: 2016-11-09
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the technical problems of incomplete coating and poor safety performance of existing high-energy explosives

Method used

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  • Coating explosive microspheres prepared through emulsion solidification and preparation method thereof
  • Coating explosive microspheres prepared through emulsion solidification and preparation method thereof
  • Coating explosive microspheres prepared through emulsion solidification and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation method of HMX explosive coated microspheres prepared with TPEE as coating agent:

[0042] Step 1: Weigh 1.0 g of polyether ester TPEE and 30 g of methylene chloride, stir at 35° C. and 500 rpm until completely dissolved, and cool to room temperature for later use. Weigh 4.0 g of HMX explosive, add it to the TPEE solution, and stir at 400 rpm to form an oil phase suspension.

[0043] Step 2: The HMX explosive suspension in Step 1 is slowly added to 150 g of an aqueous phase containing 2.0% PVA under mechanical stirring at 1000 rpm, and emulsified for 15 minutes to form uniform emulsion droplets.

[0044] Step 3: Volatilize the solvent dichloromethane at 38°C and a stirring speed of 300 rpm from the emulsion in Step 2. After the solvent evaporates for 3 hours, the solid product in the water is centrifuged, washed, and dried to obtain spherical HMX 4.9g of explosive coated microspheres.

[0045] The product effect diagram of this embodiment is as follows figure 1 As s...

Embodiment 2

[0047] Preparation method of HMX explosive coated microspheres prepared with SAN as coating agent:

[0048] Step 1: Weigh 1.0 g of SAN styrene-acrylonitrile copolymer and 50 g of ethyl acetate, stir at 50° C. and 250 rpm until completely dissolved, and cool to room temperature for later use. Weigh 5 g of HMX explosive, add it to the SAN solution, and stir at 450 rpm to form an oil phase suspension.

[0049] Step 2: The HMX explosive suspension in Step 1 is slowly added to 250 g of an aqueous phase containing 1.0% PVA and 0.5% SDS under mechanical stirring at 1200 rpm, and emulsified for 18 minutes to form uniform emulsion droplets.

[0050] Step 3: Volatilize the solvent ethyl acetate under the conditions of 50℃ and 450rpm stirring speed of the emulsion in Step 2. After the solvent has evaporated for 4 hours, the solid product in the water is centrifuged, washed and dried to obtain spherical HMX 5.9g of explosive coated microspheres.

[0051] The product effect diagram of this embodi...

Embodiment 3

[0053] The preparation method of RDX explosive coated microspheres prepared with Estane5703 as the coating agent:

[0054] Step 1: Weigh 2.0 g of Estane 5703 polyurethane and 80 g of methyl ethyl ketone, stir at 50° C. and 250 rpm until completely dissolved, and cool to room temperature for later use. Weigh 20 g of RDX explosive, add it to Estane solution, and stir at 450 rpm to form an oil phase suspension.

[0055] Step 2: The RDX explosive suspension in Step 1 is slowly added to 400 g of an aqueous phase containing 1.0% PVA and 1.0% SDBS under mechanical stirring at 900 rpm, and emulsified for 12 minutes to form uniform emulsion droplets.

[0056] Step 3: Volatilize the solvent ethyl acetate under the conditions of 50°C and stirring speed of 450 rpm for the emulsion in Step 2. After the solvent evaporates for 4 hours, the solid product in the water is centrifuged, washed, and dried to obtain spherical RDX 21.6g of explosive coated microspheres.

[0057] The product effect diagram ...

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Abstract

The invention discloses coating explosive microspheres prepared through emulsion solidification and a preparation method thereof. The method comprises the following steps that a macromolecule coating agent is dissolved in an organic solvent at first to obtain a solution, then, an explosive is suspended in the solution to form an even oil phase, the oil phase is added into a water phase containing an emulsifying agent with high-speed stirring to form spherical emulsion drops, the organic solvent in the spherical emulsion drops is volatilized, and the coating explosive microspheres with the explosive surfaces evenly coated with the coating agent are obtained. By means of the method, spherical micron-order coating explosive particles with good dispersity are obtained through the emulsion drops, the explosive is soaked and suspended in the macromolecule solution, the macromolecule coating agent is gradually separated out and solidified on the explosive surface, an even and tight coating layer is formed, the explosive high energy level is maintained, and meanwhile the sensitivity is greatly lowered.

Description

Technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a coated explosive microsphere prepared by emulsion solidification and a preparation method thereof. Background technique [0002] High-energy explosives Cyclotetramethylenetetranitramine (HMX), Cyclotrimethylenetrinitramine (RDX), Hexanitrohexaazaisowurtzitane (CL-20), etc., are currently the most widely used military weapons and equipment. Elementary explosives. However, elemental explosives such as HMX, RDX, CL-20 have high impact sensitivity, friction sensitivity, electrostatic spark sensitivity, etc., and their safety performance is poor. The use of insensitive agent coating technology to reduce the sensitivity of high-energy explosives has become one of the research hotspots in the field of high-energy materials. Coating polymer coating agents and other inert materials on the surface of elemental explosives to prepare polymer bonded explosives (PBX) is o...

Claims

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Application Information

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IPC IPC(8): C06B21/00C06B23/00
CPCC06B21/0033C06B21/0083C06B23/00C06B23/009
Inventor 李玉斌郑雪杨志剑潘丽萍张建虎
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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