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Metastable-state composite material and preparation method thereof

A composite material and metastable technology, applied in offensive equipment, explosive processing equipment, explosives, etc., can solve the problems of aluminum particle fuel-fluoropolymer oxidizer effective heat transfer performance, low thermal conductivity of fluoropolymer, Composite powder heat transfer efficiency, energy release rate limitation, etc., to achieve the effect of enhancing heat transfer path, low cost, and improving interface bonding strength

Active Publication Date: 2022-06-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the thermal conductivity of fluoropolymer itself is usually very low, so in the fluoropolymer / aluminum particle metastable composite system, the effective heat transfer performance of aluminum particle fuel-fluoropolymer oxidant is greatly restricted. The specific performance is that the heat transfer efficiency and energy release rate of the composite powder are limited during the combustion process.

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  • Metastable-state composite material and preparation method thereof
  • Metastable-state composite material and preparation method thereof
  • Metastable-state composite material and preparation method thereof

Examples

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Embodiment 1

[0059] A metastable composite material, the preparation method of which comprises the following steps:

[0060] 1) the preparation of graphene oxide dispersion liquid: select the graphene oxide that particle diameter is 0.5 μm-3 μm, and graphene oxide is uniformly dispersed in distilled water by ultrasonic wave of cell disruptor, obtains the graphene oxide dispersion liquid of 2mg / mL;

[0061] 2) Prepare sulfonated graphene by solution blending modification method: take 1 g of sulfonated polyether ether ketone, add it into 50 mL of distilled water at 60°C and stir to dissolve, and then add it into the graphene oxide dispersion in step 1) to continue ultrasonic dispersion, to obtain a mixed dispersion;

[0062] Then add 0.1 mL of 85% hydrazine hydrate to the mixed dispersion, carry out the reduction reaction with a condensation reflux device (reaction temperature is 100 ° C, reaction time is 12 h), vacuum freeze-drying for 48 h (temperature is -40 ° C, vacuum degree is 10a ~ 20...

Embodiment 2

[0074] A metastable composite material, the preparation method of which comprises the following steps:

[0075] Preparation of RGO@PVDF@Al composite powder by blending method: Weigh 20 mg of commercial thermally reduced graphene (Reduced Graphene Oxide, RGO) and uniformly disperse it in an ethanol solution (water: alcohol = 40 mL: 4 mL = 10: 1), then add PVDF@Al composite powder and stir until no powder floats on the surface of the dispersion. After the reaction is completed, perform suction filtration, washing, and vacuum drying at 60 °C for 12 h to obtain a metastable composite material ( It is denoted as RGO@PVDF@Al composite powder, in which the mass fraction of commercial thermally reduced graphene is 2%).

Embodiment 3

[0077] A metastable composite material, the preparation method of which comprises the following steps:

[0078] 1) preparation of graphene oxide dispersion liquid: select the graphene oxide that particle diameter is 0.5 μm-3 μm, and graphene oxide is uniformly dispersed in distilled water by ultrasonic wave of cell disruptor, obtains the graphene oxide dispersion liquid of 1mg / mL;

[0079] 2) Prepare sulfonated graphene by solution blending modification method: take 1 g of sulfonated polyether ether ketone, add it into 50 mL of distilled water at 60°C and stir to dissolve, and then add it into the graphene oxide dispersion in step 1) to continue ultrasonic dispersion, to obtain a mixed dispersion;

[0080] Then 0.1 mL of 85% hydrazine hydrate was added to the mixed dispersion, and the reduction reaction was carried out with a condensation reflux device (reaction temperature was 100 °C, reaction time was 6 h), and vacuum freeze-dried for 48 h to obtain fluffy sulfonated graphen...

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Abstract

The invention discloses a metastable-state composite material and a preparation method thereof. The metastable state composite material has a core-shell structure, the core is aluminum particles coated with fluorine-containing polymers, and the shell layer is a sulfonated graphene coating layer or a reduced graphene oxide coating layer. The preparation method comprises the following steps: 1) adding an aluminum particle dispersion liquid into a fluorine-containing polymer solution, mixing, and separating to obtain fluorine-containing polymer coated aluminum particles; 2) dispersing sulfonated graphene or reduced graphene oxide in a solvent to prepare a dispersion liquid; and 3) adding the fluorine-containing polymer coated aluminum particles into the dispersion liquid in the step 2), mixing, and separating to obtain the metastable state composite material. The metastable-state composite material not only has a uniform and compact coating structure with good interface bonding, but also has the advantages of high active aluminum utilization rate, good heat transfer efficiency, fast energy release, good heat resistance and stability and the like, and the preparation process is simple and controllable, low in cost and suitable for large-area application.

Description

technical field [0001] The invention relates to the field of composite material preparation, in particular to a metastable composite material and a preparation method thereof. Background technique [0002] Metastable intermixed composites (MICs), usually composed of metal fuels and oxidants, are two- or multi-component energetic composites with fine structures. MICs have attracted widespread attention due to their high energy density and excellent combustion properties, and have been used in the research fields of propellants, explosives, and pyrotechnics. In the metastable composite aluminum particle system, metal fuels often use aluminum particles with high energy density, a wide range of sources and rapid reaction, and the oxidant usually includes metal oxides and fluoropolymers. The advantages of weather resistance and improvement of aluminum-based reactivity are often used to solve the problem of hindered energy release of aluminum particles to improve the utilization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B45/36C06B21/00
CPCC06B45/36C06B21/0083Y02E60/10
Inventor 沈强易卓然孙一邓皓源覃梅罗国强
Owner WUHAN UNIV OF TECH