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Composite solid propellant based on fluorine polymer modified aluminum powder, and preparation method thereof

A technology of solid propellants and fluoropolymers, which is applied in the direction of offensive equipment, compressed gas generation, explosives, etc., can solve the problems of reducing the average size of condensed phase products and difficult to control the combustion performance of propellants, so that the combustion performance is easy to control, The effect of easy control of reactivity and high combustion efficiency

Active Publication Date: 2020-06-02
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simultaneously, the present invention also proposes a preparation method based on the composite solid propellant of the modified aluminum powder, prepares corresponding propellant grains and reduces the average size of the condensed phase product by adjusting the composition of the modified aluminum powder particles, and solves the problem of Solve the problem that the propellant combustion performance is difficult to control

Method used

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  • Composite solid propellant based on fluorine polymer modified aluminum powder, and preparation method thereof
  • Composite solid propellant based on fluorine polymer modified aluminum powder, and preparation method thereof
  • Composite solid propellant based on fluorine polymer modified aluminum powder, and preparation method thereof

Examples

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example 1

[0033] A composite solid propellant based on fluoropolymer modified aluminum powder and a preparation method thereof, comprising the following process steps:

[0034](1) Polydopamine coated on the surface of aluminum powder: Add 0.60g of dopamine and 0.36g of Tris buffer (pH=8.5) into 300ml of distilled water, stir until the dopamine molecules partially polymerize (the color changes to brown), then add 4.0g Micron aluminum powder (1-2 μm) is stirred for 30 minutes to in-situ polymerize polydopamine on the surface of the aluminum powder to form a polydopamine layer, and the mixture is taken out, centrifuged and freeze-dried to obtain an aluminum powder whose surface is evenly coated with polydopamine.

[0035] (2) Mixing of polydopamine-coated aluminum powder and fluoropolymer: Weigh 0.05g PVDF into 50ml N'N-dimethylformamide, stir until PVDF is completely dissolved (about 1 hour), add 1.0g polydopamine The modified aluminum powder was stirred with a magnetic stirrer at room te...

example 2

[0048] A composite solid propellant based on fluoropolymer modified aluminum powder and a preparation method thereof, comprising the following process steps:

[0049] (1) Drying of raw materials for propellant preparation: weigh fluoropolymer, aluminum powder (1-2 μm) and ammonium perchlorate and dry in an oven at a drying temperature of 50°C for 1 day.

[0050] (2) Preparation of propellant slurry: Weigh the curing agent, plasticizer, oxidizing agent, and aluminum powder and stir until they are evenly mixed (about 2 hours).

[0051] (3) Discharge air bubbles and solidify: place the propellant slurry in a drying oven at room temperature to evacuate for 1 hour, hold the pressure for 2 hours, and then place the slurry in an oven at 80°C to cure for 4 days after the slurry is leveled.

[0052] The composite solid propellant prepared by example 2 is photographed with a camera, and its appearance is as follows image 3 As shown, the ingredients are evenly distributed, and no obvio...

example 3

[0057] A composite solid propellant based on fluoropolymer modified aluminum powder and a preparation method thereof, comprising the following process steps:

[0058] (1) Drying of raw materials for propellant preparation: weigh aluminum powder (1-2 μm) and ammonium perchlorate and dry in an oven at a drying temperature of 50° C. for 1 day.

[0059] (2) Preparation of propellant slurry: Weigh the curing agent, plasticizer, oxidizing agent, and aluminum powder and stir until they are evenly mixed (about 2 hours).

[0060] (3) Discharge air bubbles and solidify: place the propellant slurry in a drying oven at room temperature to evacuate for 1 hour, hold the pressure for 2 hours, and then place the slurry in an oven at 80°C to cure for 4 days after the slurry is leveled.

[0061] The composite solid propellant prepared by example 3 is photographed with a camera, and its appearance is as follows image 3 As shown, the ingredients are evenly distributed, and no obvious pores are ...

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Abstract

The invention relates to a composite solid propellant based on fluorine polymer modified aluminum powder, and a preparation method thereof. Fluorine polymer coated aluminum powder is prepared throughpolydopamine induction, uniform distribution of the aluminum powder and the fluorine polymer and close contact between the aluminum powder and the fluorine polymer can be achieved, and the composite has the advantages of easiness in adjustment of components and easiness in control of the reaction activity; and the surface of the aluminum powder is coated with a fluorine polymer (forming anovel aluminum-based composite fuel), so the ignition energy of the aluminum powder can be reduced, the combustion efficiency of the aluminum powder can be improved, and the solid propellant adopting the aluminum-based composite fuel has the characteristics of low average particle size of a combustion product, high combustion efficiency of the aluminum powder and adjustable combustion speed. The preparation method provided by the invention is simple in process, the structure and composition of the final product modified aluminum powder particles are easy to adjust, the activity is adjustable, the combustion performance of the obtained propellant is easy to control, and the combustion efficiency is high. The cost of the used raw materials is low, and industrial production is easy to realize.

Description

technical field [0001] The invention belongs to the field of propulsion technology, and relates to a composite solid propellant based on fluoropolymer modified aluminum powder and a preparation method. Background technique [0002] When the aluminum-containing composite solid propellant burns, the aluminum particles melt near the burning surface and agglomerate to form large aluminum agglomerates, which leads to insufficient combustion of the aluminum powder and the formation of large-sized condensed phase products (Trunov M A, Schoenitz M, Dreizin E L.Ignition of aluminum powders under different experimental conditions[J].Propellants, Explosives, Pyrotechnics, 2005, 30(1):36-43; Hasani S, Panjepour M, Shamanian M.Non-isothermal kinetic analysis of oxidation of purealuminum powder particles [J]. Oxid Met., 2014, 8(1):299-313.). The formation of the large-size condensate, on the one hand, increases the two-phase flow loss of the engine and reduces the specific impulse of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B33/06C06D5/06
CPCC06B33/06C06D5/06
Inventor 严启龙何伟齐小飞刘佩进何国强
Owner NORTHWESTERN POLYTECHNICAL UNIV