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Flaky aluminum powder coated with modified film on surface and preparation method thereof

A surface coating, flake aluminum technology, applied in the direction of coating, can solve the problems of coating deformation, aluminum surface roughness, large influence of infrared radiation, etc., to ensure the reflection ability and reduce the specific emissivity.

Active Publication Date: 2017-06-20
常州市武进晨光金属涂料有限公司
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  • Summary
  • Abstract
  • Description
  • 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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  • Flaky aluminum powder coated with modified film on surface and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0017] The preparation method of the flake aluminum powder coated with modified film on the surface of the present embodiment comprises the following steps:

[0018] Vacuum 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 to 1000°C. The powder is gasified; the evaporator where the selenium powder is placed is heated to 720 ° C ~ 780 ° C, and the selenium powder is gasified. The vaporized zinc and the vaporized selenium are transported to the reaction chamber respectively by the argon gas flow, and the vaporized zinc and the vaporized selenium react in the inner chamber 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 30µm to 60µm is placed, and the reactor is vacuumed. After vacuumi...

Embodiment 2）

[0022] 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:

[0023] step The mass parts of zinc powder, selenium powder and aluminum powder are respectively 0.65 parts of zinc powder, 0.87 parts of selenium powder and 152 parts of aluminum powder.

[0024] step The evaporator with zinc powder in it is heated to 920°C, and the zinc powder is vaporized; the evaporator with selenium powder is heated to 700°C, and the selenium powder is vaporized.

[0025] step The thickness of the ZnSe film deposited on the surface of the aluminum powder is 0.1-1.1 μm.

Embodiment 3）

[0027] 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:

[0028] step The zinc powder is replaced by sulfur powder, and the mass parts 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.

[0029] step In the process, zinc powder and sulfur powder are melted and gasified at 940°C and 710°C, respectively, and zinc vapor reacts rapidly with sulfur vapor to form zinc sulfide nanoparticles.

[0030] step The aluminum powder and the misty zinc sulfide nanoparticles are fully mixed and contacted, so that a layer of ZnS film is deposited 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 a flake aluminum powder coated with a modified film on the surface and a preparation method thereof. The modified film is a zinc sulfide film or a zinc selenide film; the thickness of the zinc sulfide film or the zinc selenide film is 0.1 μm to 3 μm . In the present invention, the zinc sulfide or zinc selenide film with excellent infrared permeability is coated on the surface of the flaky aluminum powder, and the obtained surface-modified flaky aluminum powder retains the low infrared emissivity performance of the aluminum powder itself, while the zinc sulfide or selenium The zinc oxide film greatly reduces the reflection of the flake aluminum powder to visible light, and conceals the reflection ability of the flake aluminum powder to visible light. Since the zinc sulfide or zinc selenide thin film has excellent infrared permeability, the prepared surface-coated and modified flake aluminum powder can be widely used in 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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Patent Type & Authority Patents(China)
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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