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Flexible discontinuous-body wave absorbing coating and preparation method

A wave-absorbing coating, discontinuous technology, applied in the cross field of material science and electromagnetic field theory, can solve the problems of poor absorption efficiency, narrow absorption frequency band of wave-absorbing coating, etc., achieve stable performance, broaden the effective absorption frequency band, and good application foreground effect

Inactive Publication Date: 2015-02-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems and deficiencies in the prior art, the present invention aims to provide a flexible discontinuous wave-absorbing coating and its preparation method, which can effectively improve the good matching between the wave-absorbing coating and air wave impedance, and solve the problem of absorbing Wave coating has the disadvantages of narrow absorption frequency band and poor absorption efficiency; and simple paste construction can be directly used in application, which improves the anti-shedding performance of the coating

Method used

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  • Flexible discontinuous-body wave absorbing coating and preparation method
  • Flexible discontinuous-body wave absorbing coating and preparation method
  • Flexible discontinuous-body wave absorbing coating and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Example 1 Brush-type flexible discontinuous wave-absorbing coating and its preparation process

[0039] 1. Selection and pretreatment of raw materials

[0040] 1.1 Substrate selection

[0041] The polyimide flexible matrix material is selected, and the thickness is 10 μm-100 μm.

[0042] 1.2 Cleaning of the substrate before coating deposition

[0043] The polyimide flexible substrate was ultrasonically cleaned with 99.7% acetone and absolute ethanol to remove surface oil, and dried with hot air before use.

[0044] 1.3 Absorbent selection and pretreatment

[0045] The selected wave absorbing agents are micron-sized carbonyl iron powder, micron-sized strontium ferrite powder, conductive carbon powder and barium titanate powder, and the selected wave absorbing agent is pretreated with a surface coupling agent to achieve the same effect as the coating matrix. It has a good dispersion effect, and the selected coating is polyurethane coating.

[0046] 2. Preparation of ...

Embodiment 2

[0054] Example 2 Sputtering type flexible discontinuous wave-absorbing coating and its preparation process

[0055] 1. Selection and pretreatment of raw materials

[0056] 1.1 Substrate selection

[0057] Choose flexible matrix materials such as glass fiber cloth, with a thickness of about 10 μm-100 μm.

[0058] 1.2 Cleaning of the substrate before coating deposition

[0059] The flexible substrate of the glass fiber cloth was ultrasonically cleaned with 99.7% acetone and absolute ethanol respectively to remove surface oil stains. After drying with hot air, it was placed in the vacuum chamber of DC / RF magnetron sputtering coating equipment for ion bombardment cleaning for about 10 minutes. The ion source power is controlled at 50-100w.

[0060] 1.3 Absorbent selection and pretreatment

[0061] The selected wave absorbing agents are respectively micron-sized carbonyl iron, micron-sized strontium ferrite and barium titanate, the purity of which can exceed 90%, and an appropr...

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Abstract

The invention relates to a flexible discontinuous-body wave absorbing coating and a preparation method. The flexible discontinuous-body wave absorbing coating comprises a flexible substrate and the wave adsorption coating, wherein the flexible substrate has higher wave permeability and bonding capacity; and the wave absorbing coating has a discontinuous-body unit structure, and is formed by directly brushing or rolling and coating coatings containing an absorbent onto the flexible substrate, or is formed by sputtering the absorbent onto the flexible substrate through magnetron sputtering. According to the flexible discontinuous-body wave absorbing coating, due to the discontinuous flexible design of the coating, wave impedance matching between the adsorption coating and a free space is effectively improved; an additional loss mechanism is added, so that the absorbability is greatly improved, and effective absorption band is broadened, and the problems of narrow absorption band and poor absorbability of the wave absorbing coating are solved; and the flexible substrate is adopted so as to be directly pasted for construction when being applied, so that the construction technology is simplified. The flexible discontinuous-body wave absorbing coating is simple to prepare, and has lower cost, stable performance and favorable application prospect.

Description

technical field [0001] The invention belongs to the intersecting technical field of material science and electromagnetic field theory, and relates to a high-efficiency broadband wave-absorbing coating and a preparation process. Background technique [0002] With the in-depth research on electromagnetic wave absorbing materials and the demand for practical applications, high-performance absorbing coatings such as high absorption performance, wide frequency band, light weight, and small size have become the focus of current wave-absorbing materials research. It is against this background that microwave-absorbing coatings have received more and more attention. At present, the wave-absorbing coating is mostly made by adding wave-absorbing powder to the matrix such as epoxy resin and polypropylene, by spraying or brushing. However, this coating has selective absorption of electromagnetic waves, the effective absorption frequency band is too narrow, and the coating is easy to fal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/06B32B27/28B32B17/02B32B33/00C09D5/32C09D175/04C09D7/12C09D1/00C23C14/35
Inventor 段玉平吴广利刘卓
Owner DALIAN UNIV OF TECH