Aluminum powder/polyvinylidene fluoride composite particle and its preparation method and application

A polyvinylidene fluoride and composite particle technology, which is used in transportation and packaging, metal processing equipment, explosives, etc., can solve the problems of slow combustion reaction rate and reduced active aluminum content, and achieve fast reaction speed, anti-oxidation, good quality The effect of corrosion resistance

Active Publication Date: 2021-10-22
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of Al / PVDF composite particle and its preparation method and application, to solve the slow oxidation of nano-aluminum powder in the air to cause the content of active aluminum to decrease, and the rate of combustion reaction caused by the aluminum oxide on the surface of nano-aluminum powder to be slow The problem

Method used

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  • Aluminum powder/polyvinylidene fluoride composite particle and its preparation method and application
  • Aluminum powder/polyvinylidene fluoride composite particle and its preparation method and application
  • Aluminum powder/polyvinylidene fluoride composite particle and its preparation method and application

Examples

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Effect test

Embodiment 1

[0026] Take 3.2g of aluminum powder, 0.8g of PVDF, 90mL of acetone, and 60mL of dimethylformamide to make a suspension. The needle diameter is selected as 0.4mm, the spray rate is set to 0.5mL / h, the receiving distance is 15cm, and the electrostatic voltage is 16kV, and the Al / PVDF composite particles are collected on the receiving plate. Characterized by transmission electron microscope, scanning electron microscope and burning rate tester. It is found that Al / PVDF composite particles have a typical core-shell structure, good micro-morphology, good dispersion, and a burning speed of 68m / s.

Embodiment 2

[0028] Take 0.4g of aluminum powder, 0.1g of PVDF, 12mL of acetone, and 8mL of dimethylformamide to make a suspension. The needle diameter is selected as 0.5mm, the spray rate is set to 1mL / h, the receiving distance is 10cm, and the electrostatic voltage is 12kV, and Al / PVDF composite particles are collected on the receiving plate. Characterized by transmission electron microscope, scanning electron microscope and burning rate tester. It is found that the Al / PVDF composite particles have a typical core-shell structure, good micro-morphology, and good dispersion. The burning speed is 72m / s.

Embodiment 3

[0030] Take 1.2g of aluminum powder, 0.3g of PVDF, 30mL of acetone, and 20mL of dimethylformamide to make a suspension. The diameter of the needle is 0.45mm, the spray rate is set to 2mL / h, the receiving distance is 20cm, the electrostatic voltage is 19kV, and Al / PVDF composite particles are collected on the receiving plate. Characterized by transmission electron microscope, scanning electron microscope and burning rate tester. It is found that Al / PVDF composite particles have a typical core-shell structure, good micro-morphology, good dispersion, and a burning speed of 75m / s.

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Abstract

The invention discloses aluminum powder / polyvinylidene fluoride composite particles, a preparation method and application thereof. The composite particles have a core-shell structure with nano-aluminum powder as the core and PVDF as the shell, and include 70%-90% of nano-aluminum powder and 10%-30% of PVDF in terms of mass fraction. In the present invention, a suspension of PVDF and nano-aluminum powder is prepared by using a mixed solution of acetone and dimethylformamide with a volume ratio of 3:2 as a solvent, and the suspension is electrostatically sprayed to collect Al / PVDF composite particles. The composite particle of the invention has good corrosion resistance in natural environment, can maintain the active aluminum content in the nano aluminum powder for a long time, prevent the active aluminum from being oxidized, and increase its heat release. At the same time, Al / PVDF composite particles have good dispersibility. When reacting under high temperature conditions, the reaction speed is fast, and the burning speed can reach more than 60m / s. It has broad application prospects as energetic materials.

Description

technical field [0001] The invention belongs to the technical field of energetic materials, and in particular relates to an aluminum powder / polyvinylidene fluoride composite particle and a preparation method and application thereof. Background technique [0002] The particle size, surface morphology, oxide layer state and other factors of aluminum powder have a great influence on its energy release characteristics, and the particle size is the main factor affecting its combustion performance. By reducing the particle size of aluminum powder (using nano-aluminum powder), the burning rate and pressure index are increased to a certain extent, and the heat release is increased. However, simply reducing the particle size of aluminum powder will lead to prominent problems: First, due to the increase in specific surface area, nano-aluminum powder has high surface energy, and aluminum powder in the air is easy to form chemically inert and stable particles under the action of oxygen....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02C06B45/32
CPCC06B45/32B22F1/102
Inventor 韩志伟李亚宁甘璐瑶王伯良
Owner NANJING UNIV OF SCI & TECH
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