A kind of multi-core hollow energetic microspheres for emulsion explosives and preparation method thereof

Abstract

The invention relates to an energetic sensitizer for an emulsion explosive, in particular to an energetic additive coated with hollow microspheres for the emulsion explosive, and belongs to the fieldof energetic materials. The multi-core hollow energetic microspheres for the emulsion explosive are prepared from the following components in parts by weight: 10-50 parts of polymer monomers, 5-15 parts of an expansion agent and 5-80 parts of an energetic additive. A preparation method comprises the following steps: firstly, the polymer monomers, an initiator, a cross-linking agent and a foaming agent are mixed into an oil phase, then the energetic additive is added to the oil phase, the mixture is evenly mixed and then is dispersed in a water phase and suspended in a high-pressure reactor forpolymerization, heating is performed for curing, and thermal expandable multi-core composite energetic microspheres are obtained; finally, heating is performed for foaming and expanding, cooling is performed, and the multi-core hollow energetic microspheres are obtained. The multi-core hollow energetic microspheres can have dual effects of hot spots and the energetic additive in the emulsion explosive, and a shell can improve storage stability of the energetic additive and safety of the high-power emulsion explosive.

Description

technical field [0001] The invention relates to an energetic sensitizer for emulsion explosives, more specifically an energetic additive coated with hollow microspheres for emulsion explosives, and belongs to the field of energetic materials. Background technique [0002] Emulsion explosives have become one of the most popular industrial explosives because of their good water resistance, safety, non-toxicity and environmental protection, and are widely used in engineering blasting. The main components of emulsion explosives are latex matrix and sensitizer. The latex matrix itself has no detonator sensitivity, so it must increase the detonation sensitivity by adding a sensitizer. The sensitizer provides the "hot spot" required for the detonation of the explosive in the emulsion explosive, so that the emulsion explosive is detonated stably and reliably. However, because traditional emulsion explosives contain about 10% water, their explosive power is low. Traditional sensiti...

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Problems solved by technology

In the paper "The Effect of Aluminum Powder Content and Particle Size on the Working Ability of Emulsion Explosives" (Journal of Explosives and Explosives, 2017, 40(1):40-44.), it was proposed that adding aluminum powder to emulsion explosives can improve the emulsification The working ability of explosives, but the addition of aluminum powder will reduce the thermal stability of emulsion explosives, and aluminum powder will be oxidized in the latex matrix; Ma Honghao et al. proposed two kinds of hydrogen storage Alloy type emulsion explosive (MgH 2 and TiH 2 ), the two hydrogen storage alloy powders acted as sensitizers and energetic additives in emulsion explosives, but due to the uncontrollable hydrolysis reaction of hydrogen storage alloys, it is easy to cause hydrogen bubbles of different sizes, and hydrogen bubbles are easy to escape. out, it is easy to cause safety accidents; Cheng Yangfan et al. in the paper "The effect of energetic additive of coated MgH 2 On the power of emulsion explosivessensitized by glass microballoons" (Central European Journal of Energetic Materials, 2016, 13(3): 349-356.), the glass microspheres and the coated hydrogen storage alloy MgH 2 Added to the emulsion explosive at the same time, the two play the role of "hot spots" and energetic additives respectively, but the type and mass ratio of the coating materials are not easy to control, and the coating is too dense, so that the hydrogen storage alloy cannot play the role of energetic additives , and if the coating is too loose, the coating effect will easily fail, which will affect the safety of the emulsion explosive; the patent (CN108358733A) discloses a method for thermally expandable hollow microspheres to coat energetic additives. For foam materials, the gas generated during the thermal decomposition process expands the microspheres, forming a hollow structure so that the energetic additives can be coated inside, but the expansion effect of the hollow microspheres is not obvious, and the solid expansion agent will remain in the microspheres and be blunt. Sensitive materials affect the energy-increasing effect of the energetic sensitizer, and the production process of this method is many and cumbersome

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