A kind of preparation method of heat-resistant liquid high activity and high stability modified aluminum powder

A high-stability, high-activity technology, applied in the treatment of dyed polymer organic compounds, explosives, fibrous fillers, etc., can solve the problem of the inability of modified aluminum powder to resist, and achieve improved dispersion and suspension, low equipment requirements, and technology. The effect of green environmental protection

Active Publication Date: 2021-12-31
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a highly active modified aluminum powder with heat-resistant liquid in view of the defect that the modified aluminum powder in the prior art cannot resist hot water and hot solvents, in order to obtain a product that can stably exist in hot liquid Modified aluminum powder, while improving the activity of aluminum powder, plays a vital role in the assembly and practical application of aluminum-containing explosives and propellants

Method used

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  • A kind of preparation method of heat-resistant liquid high activity and high stability modified aluminum powder
  • A kind of preparation method of heat-resistant liquid high activity and high stability modified aluminum powder
  • A kind of preparation method of heat-resistant liquid high activity and high stability modified aluminum powder

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Experimental program
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Effect test

Embodiment 1

[0028] At normal temperature and pressure, 5 g of nano-aluminum powder was added to 100 mL of water, and ultrasonically dispersed for 0.5 min to obtain an aluminum powder dispersion; then 0.5 g of dopamine and 0.5 g of polysuccinimide were added to the aluminum powder dispersion in sequence , adjust the pH value to 6, stir and react at room temperature for 24 hours, and form a dense copolymer coating layer on the surface of the aluminum powder; then filter, wash, and vacuum-dry to obtain the modified aluminum powder, which is marked as AL-1. The content of the cladding layer is 8.5 wt.% of the mass of the aluminum powder.

[0029] Stability of modified aluminum powder: After heating the modified aluminum powder in a mixture of ethyl acetate and water (volume ratio: 1:4) at 60°C for 1 hour, no hydrogen gas is generated, and the microscopic appearance of the modified aluminum powder remains unchanged. change.

[0030] Determination of ignition power, burning rate and ignition d...

Embodiment 2

[0032] At normal temperature and pressure, 8.75 g of nano-aluminum powder was added to 200 mL of water, and ultrasonically dispersed for 0.7 min to obtain an aluminum powder dispersion; then 0.3 g of tea polyphenols and 0.4 g of polyacrylamide were added to the aluminum powder dispersion in sequence , adjusted the pH value to 8, stirred and reacted at room temperature for 6 hours, and formed a dense copolymer coating layer on the surface of the aluminum powder; then filtered, washed, and dried in vacuum to obtain a modified aluminum powder, marked as AL-2. The content of the cladding layer is 8.2 wt.% of the mass of the aluminum powder.

[0033] Stability of modified aluminum powder: After heating the modified aluminum powder in a mixture of ethyl acetate and water (volume ratio 1:4) at 70°C for 1 hour, no hydrogen gas is produced.

[0034] Determination of ignition power, burning rate and ignition delay of modified aluminum powder: see Table 1.

Embodiment 3

[0036]At normal temperature and pressure, 3 g of micron aluminum powder was added to 50 mL of water and ultrasonically dispersed for 0.6 min to obtain an aluminum powder dispersion; then 0.4 g of tannic acid and 0.2 g of polyaniline were added to the aluminum powder dispersion in sequence, Adjust the pH value to 6.5, stir and react at room temperature for 10 hours, and form a dense copolymer coating layer on the surface of the aluminum powder; then obtain the modified aluminum powder (AL-3) through suction filtration, washing, and vacuum drying. The content is 3.3 wt.% of the mass of aluminum powder.

[0037] Stability of modified aluminum powder: After heating the modified aluminum powder in a mixture of ethyl acetate and water (volume ratio 1:4) at 80°C for 1 hour, no hydrogen gas is produced.

[0038] Determination of ignition power, burning rate and ignition delay of modified aluminum powder: see Table 1.

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Abstract

The invention discloses a method for preparing a heat-resistant liquid modified aluminum powder with high activity and high stability. The aluminum powder is ultrasonically dispersed in water at normal temperature and pressure to obtain an aluminum powder dispersion; and then polyphenolic compounds, Nitrogen-containing polymers are added to the aluminum powder dispersion, and the pH value is adjusted to 5.0~10.0, then stirred and reacted at room temperature for 0.5~24h, and a dense copolymer coating layer is formed on the surface of the aluminum powder; finally, it is filtered and washed , vacuum drying to obtain modified aluminum powder. The present invention adopts the copolymer coating layer formed by polyphenolic compounds and nitrogen-containing polymers, which not only improves the stability of aluminum powder in hot liquid, but also increases the active sites and oxidation efficiency of aluminum powder oxidation reaction, improving the The burning rate of aluminum powder can improve the detonation performance of explosives and provide technical support for the practical application of aluminum powder in energetic materials.

Description

technical field [0001] The invention relates to a method for modifying aluminum powder, in particular to a method for preparing heat-resistant liquid modified aluminum powder with high activity and high stability, and belongs to the technical field of energetic materials. Background technique [0002] As a common energetic material component, aluminum powder is widely used in the fields of solid propellants, explosives and thermite because of its high energy density, high heat of combustion and high activity to improve the density specific impulse and combustion of propellants. Temperature, detonation heat, detonation temperature and working ability of explosives, etc. Due to the high surface energy of micro / nano aluminum powder, it is very easy to react with oxygen in the air at normal temperature and pressure to form a dense, corrosion-resistant inert oxide film. Although the inert oxide film prevents the further oxidation of the aluminum powder and protects the internal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/40C09C3/10C06B27/00C06B45/22
CPCC09C1/40C09C3/10C06B45/22C06B27/00
Inventor 李凌霄张俊平李鑫杨燕飞李步成
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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