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Leafing aluminum powder coated with modified film and preparing method thereof

A technology of surface coating and flake aluminum, applied in the direction of coating, etc., can solve the problems of cladding layer deformation, cladding layer peeling, aluminum surface roughness, etc., to reduce reflection, ensure reflection ability, and reduce specific emissivity Effect

Active Publication Date: 2015-11-18
常州市武进晨光金属涂料有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, there are many defects in this process. For example, the dispersion medium used in the synthesis is either acidic or alkaline. In such a system, the surface of the aluminum foil will be corroded to form a layer of metal oxide (aluminum oxide) and deposited salt. The clean aluminum surface will become rough, resulting in the presence of additional cladding layers that have a greater impact on the level of infrared radiation, thus affecting the infrared scattering of aluminum powder coated with zinc sulfide, zinc selenide or cadmium sulfide, cadmium selenide with reflection effect
Secondly, this method can easily lead to the destruction of the coating layer or the deformation of the flake aluminum powder during the heat treatment dehydration and crushing process, causing the coating layer to peel off. In addition, the dehydration of the coating layer will also cause the coating layer to be easily loose and porous. affect the wrapping effect

Method used

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  • Leafing aluminum powder coated with modified film and preparing method thereof

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Comparison scheme
Effect test

Embodiment 1

[0018] The preparation method of the flake aluminum powder coated with modified film on the surface of the present embodiment comprises the following steps:

[0019] ① Vacuumize the two evaporators, then pass in argon gas and fill the inner cavity of the evaporator; put the zinc powder and selenium powder into the two evaporators respectively, and heat the evaporator where the zinc powder is placed to 950 ° C ~ 1000 ° C, Zinc powder is gasified; the evaporator where the selenium powder is placed is heated to 720°C to 780°C, and the selenium powder is gasified. The gasified zinc and the gasified selenium are transported to the reaction chamber respectively by the argon gas flow, and the gasified zinc and the gasified selenium react in the inner cavity of the reactor to form zinc selenide. Zinc selenide is in a mist state in the reaction chamber. In another reactor, flake aluminum powder with a particle size of 30 μm to 60 μm is placed, and the reactor is vacuumed, and high-pre...

Embodiment 2

[0023] The preparation method of the flaky aluminum powder of the surface coated modified film of the present embodiment is the same as that of Example 1, except that:

[0024] The mass fractions of zinc powder, selenium powder and aluminum powder in step ① are respectively 0.65 parts of zinc powder, 0.87 parts of selenium powder and 152 parts of aluminum powder.

[0025] In step ①, heat the evaporator with zinc powder to 920°C to vaporize the zinc powder; heat the evaporator with selenium powder to 700°C to vaporize the selenium powder.

[0026] Step ② Depositing a ZnSe film on the surface of the aluminum powder with a thickness of 0.1-1.1 μm.

Embodiment 3

[0028] The preparation method of the flaky aluminum powder of the surface coated modified film of the present embodiment is the same as that of Example 1, except that:

[0029] In step ①, zinc powder is replaced by sulfur powder, and the mass fractions of zinc powder, sulfur powder, and aluminum powder are respectively 0.72 parts of zinc powder, 0.35 parts of sulfur powder, and 107 parts of aluminum powder.

[0030] In step ①, zinc powder and sulfur powder are melted and gasified at high temperatures of 940°C and 710°C respectively, and the zinc vapor reacts rapidly with the sulfur vapor to form zinc sulfide nanoparticles.

[0031] Step ② The aluminum powder is fully mixed and contacted with the mist zinc sulfide nanoparticles, so as to deposit a layer of ZnS film on the surface of the aluminum powder, and the thickness of the ZnS film is 0.2-2.3 μm.

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Abstract

The invention discloses leafing aluminum powder coated with a modified film and a preparing method thereof. The modified film is a zinc sulfide film or zinc selenide film which is 0.1-3 [mu]m thick. The surface of the leafing aluminum powder is coated with the zinc sulfide film or zinc selenide film which has excellent infrared transmission property, so that the obtained surface-modified leafing aluminum powder reserves the low infrared emitting ability of aluminum powder, visible light reflection is greatly reduced by means of the zinc sulfide film or zinc selenide film, and the visible light reflection ability of the leafing aluminum powder is hidden. Due to the fact that the zinc sulfide film or zinc selenide film has excellent infrared transmission property, the manufactured leafing aluminum powder coated with the modified film can be widely applied to infrared camouflage materials.

Description

technical field [0001] The invention relates to the surface modification technology of flake aluminum powder, in particular to a flake aluminum powder whose surface is coated with a modified film and a preparation method thereof. Background technique [0002] Flake metal pigments, especially flake aluminum powder, have very low infrared specific radiation parameters, but their strong reflection of visible light limits their use in camouflage material systems. By coating the surface of the flake aluminum powder with a layer of film material with good infrared permeability, the low infrared emissivity of the aluminum foil can be retained while concealing the reflective ability of the aluminum foil to visible light. [0003] For the coating technology of flake aluminum powder, previous researchers used to use the solution method to deposit a layer of metal salt on the surface of aluminum foil, and then dehydrate and pulverize it at high temperature. However, there are many def...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/12
Inventor 徐勤力李江新岳晓峰
Owner 常州市武进晨光金属涂料有限公司
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