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
CN110640136BActive Publication Date: 2021-10-22NANJING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF SCI & TECH
Publication Date
2021-10-22

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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