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Electromagnetic wave absorption product and manufacturing method thereof

A technology for absorbing products and manufacturing methods, which is applied in the direction of shielding, instruments, and parts of instruments, etc., and can solve problems such as endangering the health of operators, unsatisfactory dispersion effect of fiber absorbing agents, and poor absorbing performance of electromagnetic wave absorbing products. , to achieve the effect of cleaner production

Inactive Publication Date: 2010-06-16
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two problems in this process: on the one hand, this process will consume a large amount of organic solvents with certain toxicity, such as xylene, toluene, isopropanol, nitrogen-nitrogen dimethylformamide, etc. If you do not pay attention to recycling And take good protective measures, it will pollute the environment and endanger the health of operators; on the other hand, the dispersion effect of this process on fiber absorbing agent is not ideal
[0009] In summary, the processes used to prepare electromagnetic wave absorbing products in the prior art are generally unable to obtain electromagnetic wave absorbing products that are good in both the filling rate of the wave absorbing agent and the orientation distribution of the wave absorbing agent. Therefore, the wave absorbing performance of the obtained electromagnetic wave absorbing products Poor, rendering it less than ideal for its intended use

Method used

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  • Electromagnetic wave absorption product and manufacturing method thereof
  • Electromagnetic wave absorption product and manufacturing method thereof
  • Electromagnetic wave absorption product and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Preparation of Fe by water atomization 74 Cr 2 Mo 2 Sn 2 P 10 Si 6 B 2 C 2 Soft magnetic powder, its microscopic appearance is like Picture 9 As shown, the particles in the powder are approximately spherical. Using absolute ethanol as the dispersion medium, ball milled in a planetary ball mill at 400 rpm for 16 hours, the microscopic appearance is as Picture 10 As shown, the nearly spherical powder turns into a flat powder. The average thickness of the obtained flat powder is about 0.8-1μm, and the aspect ratio is about 10-80 (the powder may contain a small amount of irregular small particles, because the content is very small, so it will not significantly affect the product's absorbing performance) . Subsequently, the powder was heat-treated in a vacuum heat treatment, and the process parameters were heat preservation at 440°C for 1 hour. The powder is insulated and coated with epoxy resin and low molecular polyimide. The specific operation method is as follows: diss...

Embodiment 2

[0061] Using the same method as in Example 1, a flat powder wave absorbing agent was prepared. Mix it with a two-component liquid silicone resin at a filling rate of 20vol.%, according to Figure 8 The manufacturing process prepares three-dimensional electromagnetic wave absorbing products. The process uses dual-axis rotation, and the speed of both shafts is 100 rpm. Cured for 6h at room temperature. Demoulding to obtain three-dimensional electromagnetic wave absorbing products.

[0062] Observe its cross section with a scanning electron microscope, such as image 3 As shown, the absorber is distributed in orientation.

Embodiment 3

[0064] In order to obtain an electromagnetic wave absorbing sheet with a filling rate of 50 vol.%, the following experiment was performed.

[0065] Considering that the small amorphous particles in the absorber will reduce the filling rate of the electromagnetic wave absorbing sheet, FeNi with good plasticity is used 50 Aerosolized powder (shape like Picture 12 Shown) ball milling. Process: Using absolute ethanol as the dispersion medium, ball milled in a planetary ball mill at a speed of 400 rpm for 12 hours, the microscopic appearance is as Figure 13 As shown, the nearly spherical powder turns into a flat powder with a thickness of about 0.6-0.8 μm and an aspect ratio of about 50-200. Adopting pouring polyurethane with good fluidity as the polymer matrix, mixing it with flat powder wave absorbing agent, and putting it into a rotating mold for molding. The centrifugal force is 50G. After rotating for 30 minutes, heat the mold to 80° and keep it for 2 hours to make the polyuret...

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Abstract

The invention aims at providing a method for manufacturing an electromagnetic wave absorption product and the electromagnetic wave absorption product prepared by adopting the method. The method comprises the following steps of: premixing a flat powder wave absorbing agent or a fiber wave absorbing agent with a high polymer material which can formed by a rotational molding way, then putting into a die and carrying out rotational molding. The flat powder wave absorbing agent or the fiber wave absorbing agent is in orientation distribution in a high polymer substrate by controlling the temperature and the rotation speed. In the invention, by matching with a laminated forming process, a two-dimensional electromagnetic absorption product with accurate thickness control can be manufactured; and by adopting the die design, a plurality of three-dimensional electromagnetic wave absorption products can be obtained.

Description

Technical field [0001] The invention relates to an electromagnetic wave absorbing product for dealing with electromagnetic noise and a manufacturing method thereof. Background technique: [0002] At present, electromagnetic compatibility is one of the difficult problems faced by mankind. It affects the safety and reliability of electronic equipment, and also endangers human health. The issue of electromagnetic compatibility has attracted the attention of countries all over the world, especially in the past few decades, a lot of research work has been done and certain results have been achieved. [0003] There are two ways to solve electromagnetic compatibility problems: electromagnetic shielding and electromagnetic absorption. Electromagnetic shielding is a measure that uses shielding materials to limit electromagnetic waves in a certain space to achieve the goal of protection; electromagnetic absorption is a measure that converts electromagnetic wave energy into heat or other fo...

Claims

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Application Information

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IPC IPC(8): G12B17/02B29C41/52B29C41/04
Inventor 李德仁卢志超刘开煌刘天成张亮陈征张俊峰周少雄
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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