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Preparation method for fluororubber cladding nanometer aluminum powder composite particles

A technology of nano-aluminum powder and composite particles, which is applied in the direction of nanotechnology, can solve the problems of energy reduction and compatibility, and achieve the effects of short preparation cycle, improved compatibility and prevention of agglomeration

Inactive Publication Date: 2014-01-15
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a preparation method of fluororubber-coated nano-aluminum powder composite particles to protect the activity of nano-aluminum powder. Degradation and Compatibility Issues

Method used

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  • Preparation method for fluororubber cladding nanometer aluminum powder composite particles
  • Preparation method for fluororubber cladding nanometer aluminum powder composite particles
  • Preparation method for fluororubber cladding nanometer aluminum powder composite particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) In an inert gas (N 2 ) Weigh 5g of nano-aluminum powder with an average particle size of 80nm in the glove box, and quickly add it to a three-necked flask filled with 100mL of absolute ethanol. 2 Under protective conditions, ultrasonically disperse for 20 minutes to disperse the nano-aluminum powder evenly; weigh 0.25g of silane coupling agent KH-560, add it to the suspension of nano-aluminum powder, continue ultrasonically dispersing for 30 minutes, and stir in a constant temperature water bath at 60°C at 300rpm After 3 hours, cool to room temperature, filter, and vacuum-dry at 60°C for 12 hours to obtain KH-560 modified nano-aluminum powder.

[0025] (2) Weigh 0.36g of pre-dried fluororubber 26 (Viton A), add it to 120mL of ethyl acetate, place it in a 70°C water bath and heat for 30min to prepare the ethyl acetate solution of fluororubber 26 (3g / L), After cooling to 25°C, seal it for later use. Weigh 3.68g of modified nano-aluminum powder, add 61.3mL of ethyl a...

Embodiment 2

[0027] (1) In an inert gas (N 2 ) Weigh 5g of nano-aluminum powder with an average particle size of 80nm in the glove box, and quickly add it to a medium three-necked flask filled with 150mL of absolute ethanol. 2 Under protective conditions, ultrasonically disperse for 20 minutes to uniformly disperse the nano-aluminum powder in anhydrous ethanol; then weigh 0.5 g of aminosilane coupling agent KH-550, add it to the suspension of nano-aluminum powder, and continue ultrasonically dispersing for 30 minutes. in N 2 Stir at 400 rpm for 2 hours in a constant temperature water bath at 65°C under protected conditions, cool to room temperature after stirring, filter, and vacuum dry at 60°C for 12 hours to obtain KH-550 modified nano-aluminum powder.

[0028] (2) Weigh 0.48g of pre-dried fluororubber 246 (Viton B), add it to 120mL of acetone, place it in a 70°C water bath and heat it under reflux for 30min, prepare the acetone solution of fluororubber 246 (4g / L), cool to 25 After ℃, ...

Embodiment 3

[0034] (1) In an inert gas (N 2 ) Weigh 5g of nano-aluminum powder with an average particle size of 80nm in the glove box, and quickly add it to a three-necked flask filled with 150mL of absolute ethanol. 2 Under protective conditions, ultrasonically disperse for 30 minutes to disperse the nano-aluminum powder evenly; weigh 0.75g of silane coupling agent KH-570, add it to the suspension of nano-aluminum powder, continue ultrasonically dispersing for 30 minutes, and stir in a constant temperature water bath at 65°C at 500rpm After 2 hours, cool to room temperature, filter, and vacuum-dry at 60°C for 12 hours to obtain KH-570 modified nano-aluminum powder.

[0035] (2) Weigh 1.2g of pre-dried fluororubber 23 (Kel-F-rubber), add it to 120mL ethyl acetate, place it in a 70°C water bath and heat for 30min, and prepare the ethyl acetate solution of fluororubber 23 (10g / L), cooled to 25°C and sealed for later use. Weigh 4g of nano-aluminum powder modified by KH-570, add 80mL of et...

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Abstract

The invention discloses a preparation method for fluororubber cladding nanometer aluminum powder composite particles. The preparation method comprises the following steps that the silane coupling agent with the mass being 5-15% that of nanometer aluminum powder is used for modifying the nanometer aluminum powder; fluororubber with the mass being 5-20% that of the modified nanometer aluminum powder is selected and used, a solvent-nonsolvent method is used for conveying cladding modifying on the nanometer aluminum powder modified by the coupling agent, nanometer aluminum powder / fluororubber composite particles are prepared, and the composite particles are of a core-shell structure; the cladding layer fluororubber can postpone the normal temperature oxidation of the nanometer aluminum powder, and the high temperature oxidation rate and heat release rate of the nanometer aluminum powder are significantly improved. The preparation method for the fluororubber cladding nanometer aluminum powder composite particles can effectively prevent the oxidation of the nanometer aluminum powder, keep the activity of the nanometer aluminum powder, overcome the influence of non-formula composition or inert composition cladding nanometer aluminum powder on the comprehensive performance of pyrotechnic composition and propellant, and improve the compatibility between the nanometer aluminum powder and pyrotechnic composition, propellant and the like.

Description

technical field [0001] The invention relates to a preparation method of fluororubber-coated nano-aluminum powder composite particles, which is used for active protection of nano-aluminum powder. The composite particles can be used as high-energy metal fuel in pyrotechnic agents or propellants, and belong to nano-material preparation and application technology field. Background technique [0002] As a new type of nanomaterial, nano-aluminum powder has the advantages of low density, high heat of combustion, and rich sources of raw materials. It is mainly used in pyrotechnics, solid propellants, explosives and other fields. Significantly improve the combustion performance of these energetic materials. The particle size, shape and binder content of aluminum powder have a great influence on the burning rate, detonation heat and sensitivity of pyrotechnic agents and propellants. [0003] Due to the special surface effect of nano-aluminum powder, it is in a highly activated state...

Claims

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Application Information

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IPC IPC(8): B22F1/02B82Y40/00
Inventor 叶明泉刘松松任成露韩爱军陈昕李建
Owner NANJING UNIV OF SCI & TECH
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