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a al/pvdf/pda/fe 2 o 3 Three-layer core-shell structure thermite and preparation method thereof

A core-shell structure and thermite technology, which is used in offensive equipment, explosives processing equipment, explosives, etc., can solve the problems of easy agglomeration of composite particles, poor combustion performance, low energy release efficiency, etc., to improve mechanical strength and reduce sensitivity. , the effect of high safety

Active Publication Date: 2021-10-08
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 in the prior art, the invention provides an Al / PVDF / PDA / Fe 2 o 3 A three-layer core-shell structure thermite and its preparation method solve the problems of high cost, poor environmental protection, easy aggregation of prepared composite particles, low energy release efficiency, and poor combustion performance of the existing preparation method.

Method used

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  • a al/pvdf/pda/fe <sub>2</sub> o <sub>3</sub> Three-layer core-shell structure thermite and preparation method thereof

Examples

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preparation example Construction

[0036] The present invention prepares a kind of Al / PVDF / PDA / Fe with Al as the core 2 o 3 The improved thermite with three-layer core-shell structure, its preparation method mainly includes the following steps:

[0037] Step 1, after mixing micron-sized aluminum powder with N,N-dimethylformamide and acid solution, stirring at room temperature for 30-60 minutes to obtain aluminum powder dispersion.

[0038] The acid solution of the present invention can choose H 2 SO 4 solution, HCl solution or HNO3 solution, the mass fraction of the acid solution is 2% to 5%. The particle size of the aluminum powder particles is preferably 5-20um.

[0039] Step 2, dissolving PVDF (polyvinylidene fluoride) in N,N-dimethylformamide to obtain a PVDF solution, preferably in the present invention, the concentration of the PVDF solution is 8-15g / L; then add the PVDF solution to In the aluminum powder dispersion in step 1, preferably in the present invention, the addition rate of the PVDF solutio...

Embodiment 1

[0046] 1) Surface treatment of Al powder:

[0047] Weigh 120g concentrated H 2 SO 4 Slowly add 4L of distilled water under the condition of mechanical stirring to make it completely dissolved to obtain about 3% H 2 SO 4 solution; weigh 400g of aluminum powder with a particle size of 5-20um and add it to 4LDMF solvent, and stir after ultrasonication for 5 minutes to make it evenly dispersed in the solvent; mix 4L of 3% H 2 SO 4 The solution was poured into the Al powder dispersion, placed in a fume hood and stirred for 30 minutes.

[0048] 2) Synthesis of Al / PVDF:

[0049] Weigh 40g PVDF and add it to 2L DMF solvent, heat the oil bath to 50°C, and stir at this temperature until it is completely dissolved to form a light yellow transparent solution, then add 2LDMF, stir for 10min and then cool naturally to room temperature to obtain a concentration of 10g / L in PVDF solution.

[0050] Add the prepared PVDF solution into the above-mentioned Al powder pretreatment system at...

Embodiment 2

[0062] The difference between this embodiment and embodiment 1 is: Al powder is 400g, PVDF is 50g, Al / PVDF is 18g, DOPA is 2.25g, Al / PVDF / PDA is 9g, FeSO 4 That is, the mass ratio of Al powder to PVDF is 8:1, the mass ratio of Al / PVDF material to DOPA is 8:1, and the mass ratio of Al / PVDF / PDA material to FeSO 4 The mass ratio is 10:1.

[0063]The morphology of the product synthesized in this example is similar to that of Example 1, except that the thickness of each layer is different.

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Abstract

The invention discloses an Al / PVDF / PDA / Fe 2 o 3 A three-layer core-shell structure thermite and a preparation method thereof. First, after mixing micron-sized aluminum powder with N,N-dimethylformamide and an acid solution, stirring at room temperature for 30 to 60 minutes to obtain an aluminum powder dispersion; Dissolve PVDF in N,N-dimethylformamide to obtain PVDF solution; add PVDF solution to aluminum powder dispersion and react at 55-65°C for 3-6 hours to obtain Al / PVDF material; Al / PVDF material Add DOPA to Tris-HCl buffer solution, adjust the pH value to 8-12, and stir at room temperature for 8-24 hours to obtain Al / PVDF / PDA material; finally, mix Al / PVDF / PDA material with metal iron salt, and stir at room temperature for reaction After 20-28 hours, add alkaline solution and mix, stir and react for 3-8 hours to obtain Al / PVDF / PDA / Fe 2 o 3 Material. The thermite with a three-layer core-shell structure prepared by the method of the invention can significantly improve the thermal reaction performance of the aluminum powder, and increase its energy release efficiency and rate.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a composite solid propellant fuel or aluminum explosive, in particular to an Al / PVDF / PDA / Fe 2 o 3 A three-layer core-shell structure thermite and a preparation method thereof. Background technique [0002] Propellants and explosives are the energy source and basis for weapons and equipment to achieve efficient damage and long-distance delivery. Adding metal fuels such as aluminum powder to the explosive and propellant formula is an inevitable choice to increase its energy level. It can also increase the density, detonation heat and working ability of the mixed explosive formula, and increase the burning rate of the propellant. However, there is still a lot of room for improvement in the energy release efficiency and rate of existing aluminum-containing explosives and propellants. This is mainly because the Al powder in the formula has problems such as low energy rele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C06B45/32C06B21/00C06D5/00
CPCC06B21/0083C06B45/32C06D5/00
Inventor 姜一帆赵凤起安亭杨燕京李辉李娜张明蒋周峰张建侃
Owner XIAN MODERN CHEM RES INST
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