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Method for coating thermal expansion hollow microspheres with energy-containing additive

An additive and thermal expansion technology, applied in non-explosive/non-thermal agent components, non-explosive stabilizers, offensive equipment, etc., can solve the problems of hydrogen bubbles of different sizes, hidden safety hazards, and difficult to control, so as to improve the working ability , reduce sensitivity and prevent demulsification

Active Publication Date: 2018-08-03
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CN201110277487.4 and CN201110277355.1 respectively disclose a titanium hydride type hydrogen storage emulsion explosive and a magnesium hydride type hydrogen storage emulsion explosive. The hydrogen storage material is added to the emulsion explosive as an energetic additive to improve the detonation performance of the explosive , the hydrogen bubbles produced by the decomposition of titanium hydride and magnesium hydride are of different sizes and are not easy to control, and the H in the sensitized bubbles 2 It is easy to escape, and there is a potential safety hazard; Ye Zhiwen et al. provided a paper "Sensitization of NL Organic Microspheres to Emulsion Explosives" (Mining and Metallurgy Engineering, 2012, 32(2): 23-25.) A method for making heat-expandable NL organic microspheres and its application in emulsion explosives. Heat-expandable microspheres with a core-shell structure are prepared by suspension polymerization. The core solvent is an alkane with a low boiling point, and the vaporization of the core solvent generates pressure to force the shell to expand. , but the heat-expandable NL organic microspheres can only act as sensitizers for emulsion explosives, and cannot be used as energetic additives to improve the detonation performance of explosives; 2 on the power ofemulsion explosivessensitized by glass microballoons" (Central European Journal of Energetic Materials, 2016, 13(3): 349-356.) Glass microspheres and coated metal powder MgH 2 Added to the emulsion explosives respectively, the glass microspheres play the role of providing "hot spots" during the detonation process of the emulsion explosives, while the metal powder MgH 2 It acts as an energetic additive in emulsion explosives; CN106748589A discloses an energetic composite sensitizer for emulsion explosives and its preparation method, and prepares high-energy metal powder coated with porous silica hollow microspheres by a four-step method , the porous silica hollow microspheres containing an energetic sensitizer act as a sensitizer, and the high-energy metal powder inside acts as an energetic additive, which combines the functions of the sensitizer and the energetic additive into one , but the production steps of the sensitizer are many, the process is cumbersome, the emulsification matrix will slowly penetrate into the porous silica microspheres and lose the sensitization effect, so that the emulsion explosive cannot be detonated

Method used

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  • Method for coating thermal expansion hollow microspheres with energy-containing additive
  • Method for coating thermal expansion hollow microspheres with energy-containing additive
  • Method for coating thermal expansion hollow microspheres with energy-containing additive

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Polymer hollow microspheres encapsulated hydrogen storage material TiH 2 The preparation method:

[0031] St1: mix 0.2g sodium bicarbonate with 20g TiH 2 Add it to the ball mill, the speed of the ball mill is 30rpm / min, and the ball mill is 2h. After the ball mill is completed, the sodium bicarbonate particles are dispersed and coated with TiH 2 particle surface.

[0032] St2: Add 3g of acrylonitrile, 1g of methyl acrylate, and 1g of vinyl acetate to a stirrer with a heating function. After stirring and mixing evenly, add oil-soluble initiator azobisisobutyronitrile and 0.3 % cross-linking agent polyethylene glycol 200 dimethacrylate, after stirring and mixing evenly, the temperature was raised to 62°C for bulk polymerization, and after pre-polymerization for 30 minutes, the system temperature was quickly lowered to 20°C with an ice bath. Add the energetic additive coated in St1, and stir well, so that the coated energetic additive and the prepolymer are evenly mixed...

Embodiment 2

[0036] The preparation method of Al powder coated with polymer hollow microspheres:

[0037] St1: Add 0.5g of modified azodicarbonamide and 30g of Al powder into a ball mill, the speed of the ball mill is 60rpm / min, and ball mill for 2h to complete the coating of the expansion agent on the aluminum powder.

[0038] St2: Add 4g of styrene, 3g of acrylonitrile, and 3g of vinylidene chloride monomer into a reactor with a stirrer and a heating device. After stirring and mixing evenly, add 1% of the total mass of the monomers as an oil-soluble initiator azo Diisobutyronitrile and 0.75% cross-linking agent trimethylolpropane triacrylate, stir and mix evenly, then heat up to 65°C for bulk polymerization, pre-polymerize for 1 hour, quickly lower the system temperature to 25°C with an ice bath, Add the energetic additive coated in St1, and stir well to make the Al powder of the energetic additive and the prepolymer evenly mixed;

[0039] St3: configure 150ml Mg(OH) 2 solution, and th...

Embodiment 3

[0042] The preparation method of polymer hollow microspheres encapsulating boron powder:

[0043] St1: Put 0.6g of azodicarbonamide and 30g of boron powder into a ball mill, the ball mill rotates at a speed of 45m / min, and mill for 2 hours, and the expansion agent-modified azodicarbonamide is dispersed and coated on the surface of the boron powder particles.

[0044] St2: Add 7g of acrylonitrile, 2g of methyl methacrylate, and 1g of glycidyl methacrylate into a reactor with a stirrer and a heating device. Agent benzoyl peroxide and 1% cross-linking agent polyethylene glycol 400 dimethacrylate, stir and mix evenly, then raise the temperature to 90°C for bulk polymerization, pre-polymerize for 45min, and quickly lower the system temperature to 30°C , add the energetic additive coated in St1, stir well, so that the energetic additive and the prepolymer are evenly mixed;

[0045] St3: configure 150ml Mg(OH) 2 solution, then add the St2 mixture, stir and disperse at 350rpm / min fo...

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Abstract

The invention relates to an energy-containing sensitizing agent and in particular relates to thermal expansion hollow microspheres with an energy-containing additive and a production method thereof. The energy-containing sensitizing agent is prepared from the following components: 1 to 10 parts of expanding agent, 60 to 95 parts of energy-containing additive and 10 to 30 parts of polymer monomer.The production method comprises the following steps: firstly, adding the expanding gent and the energy-containing additive into a ball grinding mill according to a certain ratio and mixing to form scattered expanding agent particle coating on the outer surface of the energy-containing additive; finally, adding an oil-soluble initiator into the polymer monomer and carrying out body pre-polymerization at certain temperature to obtain a cross-linked pre-polymer with proper viscosity; adding the coated energy-containing additive into the cross-linked pre-polymer; after uniformly mixing, dispersing, suspending and polymerizing in a water phase; then raising the temperature and curing to obtain compound type energy-containing microspheres; finally, carrying out heating, foaming and expansion andcooling treatment to obtain the energy-containing additive coated with the hollow microspheres.

Description

technical field [0001] The invention relates to an energetic composite sensitizer, more specifically to an energetic additive coated with hollow microspheres, and in particular to a method for coating the energetic additive with thermally expanded hollow microspheres. Background technique [0002] Industrial explosives such as emulsion explosives, water-gel explosives, and ammonium oil explosives do not have detonator sensitivity without adding sensitizers, which provide hot spots for detonation in the explosives. The sensitization bubble is the sensitization center, and under a given impact detonation pressure, the heat generated by the rapid compression of the bubble accelerates the explosive reaction around the hot spot, making the detonation reaction continue. Sensitization technology is one of the key factors restricting the development of industrial explosive production technology, which directly affects its detonation performance and storage stability. Traditional se...

Claims

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Application Information

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IPC IPC(8): C06B23/00C06B27/00C06B45/18
CPCC06B23/003C06B23/006C06B23/009C06B27/00C06B45/18
Inventor 程扬帆方华刘文近宋诗祥苏健陶臣
Owner ANHUI UNIV OF SCI & TECH
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