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Method for preparing nanometer aluminum composite powder coated with nitro-cotton

A technology of composite powder and nitrocellulose bag, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of incomplete coating of nano-aluminum powder surface, poor oxidation resistance, large Agglomeration and other problems, to achieve the effect of improving antioxidant performance, preventing agglomeration, and maintaining activity

Inactive Publication Date: 2012-07-18
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the nitrocellulose molecule is rigid, and there is only intermolecular force between the nitrocellulose and the nano-aluminum powder, using this method to directly add the nano-aluminum powder to the solution of the nitrocellulose will cause the surface coating of the nano-aluminum powder to be insufficient. Complete, poor anti-oxidation ability, easy to form large agglomeration and other defects

Method used

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  • Method for preparing nanometer aluminum composite powder coated with nitro-cotton
  • Method for preparing nanometer aluminum composite powder coated with nitro-cotton
  • Method for preparing nanometer aluminum composite powder coated with nitro-cotton

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 4.0 g of nano-aluminum powder with an average particle size of 50 nm, add it to 100 mL of absolute ethanol, and ultrasonically disperse it for 30 min to make the nano-aluminum powder evenly dispersed in absolute ethanol; weigh 0.2 g of silane coupling agent KH- 550, join in the dehydrated ethanol suspension of the nano-aluminum powder after ultrasonic dispersion, continue ultrasonic dispersion 10 min, stir 2 h in the constant temperature water bath of 60 ℃, leave standstill and remove supernatant liquid with glue tip dropper, Dry in a vacuum drying oven at 60 °C for 8 h to obtain nano-aluminum powder treated with a coupling agent; weigh 5.0 g of nitrocellulose and 0.5 g of diethyl phthalate (DEP) and dissolve in 1000 mL of acetic acid Ethyl ester, and supplemented by ultrasonic dissolution, the configuration was 5.0 g·L -1 nitrocellulose solution; weigh 2.0 g of nano-aluminum powder treated with coupling agent, add it into 100 mL cyclohexane, and ultrasonically di...

Embodiment 2

[0026] Weigh 4.0 g of nano-aluminum powder with an average particle size of 50 nm, add it to 100 mL of absolute ethanol, and ultrasonically disperse it for 30 min to make the nano-aluminum powder uniformly dispersed in absolute ethanol; weigh 0.32 g of silane coupling agent KH- 560, join in the dehydrated ethanol suspension of the nano-aluminum powder after ultrasonic dispersion, continue ultrasonic dispersion 10 min, stir 2 h in the constant temperature water bath of 60 ℃, leave standstill and remove supernatant liquid with glue head dropper, Dry in a vacuum drying oven at 60 °C for 8 h to obtain nano-aluminum powder treated with a coupling agent; weigh 5.0 g of nitrocellulose and 0.4 g of dibutyl phthalate (DEP) and dissolve in 1000 mL of acetic acid Ethyl ester, and supplemented by ultrasonic dissolution, the configuration was 5.0 g·L -1 nitrocellulose solution; weigh 2.0 g of nano-aluminum powder treated with coupling agent, add it into 100 mL cyclohexane, and ultrasonical...

Embodiment 3

[0028] Weigh 4.0 g of nano-aluminum powder with an average particle size of 50 nm, add it into 100 mL of absolute ethanol, and ultrasonically disperse it for 30 min to make the nano-aluminum powder evenly dispersed in absolute ethanol; weigh 0.24 g of silane coupling agent CG- 103, added to the dehydrated ethanol suspension of nano-aluminum powder after ultrasonic dispersion, continued ultrasonic dispersion for 10 min, stirred in a constant temperature water bath at 60 °C for 2 h, and left to remove the supernatant with a rubber dropper. Dry in a vacuum drying oven at 60 °C for 8 h to obtain nano-aluminum powder treated with a coupling agent; weigh 5.0 g of nitrocellulose and 0.3 g of dibutyl phthalate (DBP) and dissolve in 1000 mL of acetone , and supplemented by ultrasonic dissolution, the configuration was 5.0 g·L -1 nitrocellulose solution; weigh 2.0 g of nano-aluminum powder treated with coupling agent, add it into 100 mL cyclohexane, and ultrasonically disperse for 30 mi...

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Abstract

The invention discloses a method for preparing nanometer aluminum composite powder coated with nitro-cotton. The method includes the steps of: dispersing nanometer aluminum powder into absolute ethyl alcohol; adding silane coupling agent with the weight accounting for 5-10% of that of the nanometer aluminum powder to obtain nanometer aluminum powder treated by the silane coupling agent; dissolving the nitro-cotton and plasticizer into ethyl acetate or acetone; dispersing the nanometer aluminum powder treated by the silane coupling agent into cyclohexane to form cyclohexane dispersing agent; adding nitro-cotton liquor into the cyclohexane dispersing agent and evenly mixing the nitro-cotton liquor; and performing filtering and vacuum drying to obtain the nanometer aluminum composite powder coated with the nitro-cotton, wherein the weight of the nitro-cotton is 0.04-0.15 time that of the aluminum powder, and the weight of the plasticizer accounts for 3-10% of that of the nitro-cotton. The nanometer aluminum powder is firstly treated by the silane coupling agent and then coated with the nitro-cotton, the surface of the nanometer aluminum powder is effectively coated with the nitro-cotton, the activity of the nanometer aluminum powder can be kept, and the oxidation resistance of the nanometer aluminum powder is improved.

Description

technical field [0001] The invention relates to a preparation method of nano-aluminum composite powder coated with nitrocellulose. The composite powder can be used as a high-efficiency metal fuel for modified double base propellant (CMDB) and nitrate plasticized polyether propellant (NEPE). It belongs to the technical field of nanometer material preparation. Background technique [0002] Aluminum powder is one of the commonly used additives in modern solid rocket propellants. Adding aluminum powder is the most effective and practical way to increase energy and suppress unstable combustion of rocket engines. Aluminum powder is widely used due to its high density, high combustion enthalpy and significant effect on improving the specific impulse of solid propellant, coupled with abundant materials and low cost. However, the ignition delay time of ordinary aluminum powder and micron-sized aluminum powder is long, the combustion efficiency is low, and it is easy to agglomerate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B82Y40/00B82Y30/00
Inventor 赵凤起姚二岗徐司雨谢钢高红旭樊学忠郝海霞安亭谭艺
Owner XIAN MODERN CHEM RES INST
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