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Double-layer core-shell structure thermite and preparation method thereof

A technology of core-shell structure and thermite, which is applied in the field of composite materials, can solve the problems of easy agglomeration of thermite particles, low energy release efficiency, and poor combustion performance, and achieve improved thermal response performance, improved mechanical strength, and mild conditions Effect

Active Publication Date: 2021-01-22
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies and defects of the prior art, the present invention provides a double-layer core-shell structure thermite and its preparation method, which solves the problem of high cost and poor environmental protection of the existing preparation method, and the prepared thermite particles are easy to agglomerate, Low energy release efficiency and poor combustion performance

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  • Double-layer core-shell structure thermite and preparation method thereof
  • Double-layer core-shell structure thermite and preparation method thereof
  • Double-layer core-shell structure thermite and preparation method thereof

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preparation example Construction

[0046] The present invention proposes a thermite with a novel structure, which has a double-layer core-shell structure. The preparation method of the double-layer core-shell structure thermite of the present invention specifically comprises the following steps:

[0047] Step 1: Add micron-sized aluminum powder into N,N-dimethylformamide, mix evenly, add acid solution, stir and react at room temperature for 30-60 minutes, and obtain Al powder dispersion.

[0048] Among them, the acid solution is H 2 SO 4 solution, HCl solution or HNO 3 solution, the mass fraction of the acid solution is 2%-5%; the particle size of the aluminum powder is 5-20 μm.

[0049] Step 2, dissolving PVDF (polyvinylidene fluoride) in N,N-dimethylformamide (DMF) to obtain a PVDF solution. Preferably in the present invention, the concentration of the PVDF solution is 7-10 g / L. Heat the Al powder dispersion in step 1 to 55-60°C, add PVDF solution, and react at this temperature for 3-6 hours to obtain th...

Embodiment 1

[0058] 1) Surface treatment of Al powder:

[0059] Weigh 30g concentrated H 2 SO 4 Slowly add 1L of distilled water under stirring condition to make it completely dissolved to obtain about 3% H 2 SO 4 solution; weigh 100g of aluminum powder and add it to 1LDMF solvent, and stir after ultrasonication for 5 minutes to make it evenly dispersed in the solvent; mix the prepared 3% H 2 SO 4 The solution was poured into the Al powder dispersion, placed in a fume hood and stirred for 30 minutes.

[0060] 2) Synthesis of Al / PVDF:

[0061] Weigh 6g of PVDF into 1L of DMF solvent, heat the oil bath to 50°C, and stir at this temperature until completely dissolved to obtain a PVDF solution with a concentration of 6g / L. Heating in a water bath to 60°C, adding the prepared PVDF solution into the above-mentioned Al powder pretreatment system at a rate of 17mL / min, and reacting at this temperature for 4 hours; after the reaction, naturally cool to room temperature, collect by suction fil...

Embodiment 2

[0072] The difference between this embodiment and embodiment 1 is that the heating temperature in step 3) is 280°C.

[0073] According to the morphology diagram of the obtained product, the morphology of the product synthesized in this example is similar to the morphology of the product in Example 1.

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Abstract

The invention discloses a double-layer core-shell structure thermite and a preparation method thereof. The preparation method comprises the steps: adding micron-sized aluminum powder into N, N-dimethylformamide, adding an acid solution after even mixing, performing a stirring reaction for 30-60 min at the room temperature, and acquiring Al powder dispersion liquid; dissolving PVDF in N, N-dimethylformamide to obtain a PVDF solution; heating the Al powder dispersion liquid to 55-60 DEG C, adding a PVDF solution, and reacting for 3-6 hours under the temperature condition to obtain an initial product of PVDF-coated aluminum; mixing the initial product with lauryl sodium sulfate and metal M salt, heating to 80-85 DEG C, adding a urea solution, and performing reacting for 3-6 hours under the temperature condition to obtain a precursor; and keeping the temperature of the precursor at 280-380 DEG C for 2-4 hours in an air environment to obtain the thermite with the double-layer core-shell structure. According to the thermite with the double-layer core-shell structure prepared by the method disclosed by the invention, the thermal reaction performance and the energy release efficiency and rate of the thermite are remarkably improved by utilizing the synergistic promotion effect between the fluorine-containing polymer PVDF and the metal oxide.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a composite solid propellant fuel or an aluminum explosive, in particular to a double-layer core-shell structure thermite and a preparation method thereof. Background technique [0002] Adding aluminum powder to the formula can improve the density, detonation heat and working ability of the mixed explosive formula, and increase the energy and burning speed of the propellant. However, in the process of production and storage, the surface of Al powder will inevitably be covered with a layer of dense oxide (Al 2 o 3 ), and the refractory oxides (such as Al 2 o 3 Melting point 2320K) will prevent further oxidation of the metal and greatly reduce the oxidation reaction rate of Al powder, resulting in low energy release efficiency of Al powder, poor combustion performance, difficulty in fully releasing energy, and small work contribution. Energy levels are well below desi...

Claims

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Application Information

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IPC IPC(8): C06B45/32C06B33/02C06B21/00C06D5/06
CPCC06B21/0008C06B33/02C06B45/32C06D5/06
Inventor 姜一帆赵凤起杨燕京安亭李辉张明张建侃蒋周峰李娜
Owner XIAN MODERN CHEM RES INST
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