Controllable Construction of Acrylic Composite Coatings with Impedance Gradient Structure for Low-reflectivity Electromagnetic Shielding in 5G High Frequency Band

Zhe-yuan Chai; Zi-cheng Wang

doi:10.11777/j.issn1000-3304.2023.23173

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Controllable Construction of Acrylic Composite Coatings with Impedance Gradient Structure for Low-reflectivity Electromagnetic Shielding in 5G High Frequency Band

Research Article | 更新时间：2024-01-03

- Controllable Construction of Acrylic Composite Coatings with Impedance Gradient Structure for Low-reflectivity Electromagnetic Shielding in 5G High Frequency Band
- Acta Polymerica Sinica Vol. 55, Issue 1, Pages: 58-66(2024)
- 作者机构：
  
  1.江南大学，化学与材料工程学院，无锡 214122
  2.江南大学，合成与生物胶体教育部重点实验室，无锡 214122
- 作者简介：
  
  Zi-cheng Wang, E-mail: wangzc@jiangnan.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2023.23173
  CLC：
- Published：20 January 2024，
  
  Published Online：27 October 2023，
  
  Received：02 July 2023，
  
  Accepted：18 August 2023
- 稿件说明：
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柴哲元, 王子成. 阻抗渐变型丙烯酸复合涂层的可控构筑及其5G高频波段低反射高效电磁屏蔽研究. 高分子学报, 2024, 55(1), 58-66

Chai, Z. Y.; Wang, Z. C. Controllable construction of acrylic composite coatings with impedance gradient structure for low-reflectivity electromagnetic shielding in 5G high frequency Band. Acta Polymerica Sinica, 2024, 55(1), 58-66
柴哲元, 王子成. 阻抗渐变型丙烯酸复合涂层的可控构筑及其5G高频波段低反射高效电磁屏蔽研究. 高分子学报, 2024, 55(1), 58-66 DOI： 10.11777/j.issn1000-3304.2023.23173.

Chai, Z. Y.; Wang, Z. C. Controllable construction of acrylic composite coatings with impedance gradient structure for low-reflectivity electromagnetic shielding in 5G high frequency Band. Acta Polymerica Sinica, 2024, 55(1), 58-66 DOI： 10.11777/j.issn1000-3304.2023.23173.

摘要

选用耐候性好、易加工、易成膜且保色性好的水性丙烯酸涂料作为基体，添加高效导电填料碳纳米管(CNT)，通过添加不同比例的碳纳米管，以实现阻抗渐变型电磁屏蔽材料的有效构筑；当CNT质量含量达到1 wt%+5 wt%+25 wt%以及1 wt%+10 wt%+25 wt%时制备的多层级复合涂层，在K波段(18~27 GHz)与Ka波段(27~40 GHz），即5G高频波段表现出优异的低反射高效电磁屏蔽性能，电磁屏蔽效能(EMI SE)均可达到20 dB以上，且呈现出低反射的特点，吸收系数最多可以达到0.92.

Abstract

The arrival of the 5G communication era has brought great convenience to people's lives

and at the same time generated a large amount of electromagnetic pollution. Therefore

there is an urgent need to develop high-performance electromagnetic shielding materials to solve the current serious problem of electromagnetic pollution. In this study

we prepared water-soluble polyacrylic acid/carbon nanotube (PAA/CNT) composites with three-layer impedance gradient structures by multiple coatings. The modification of carbon nanotubes were fully mixed with dispersant under ultrasonic condition to obtain a homogeneous dispersion

which were then centrifuged and dried. The modified carbon nanotubes and water-soluble acrylic acid were mixed in a specific ratio to obtain a homogeneous dispersion. The obtained PAA/CNT composite dispersion was coated on a polyethylene terephthalate (PET) substrate using a brush applicator. The composite coating was obtained by repeated coating after drying the coating. The difference of CNT content between each layer can realize the difference of conductivity

and then build the impedance gradient to realize the introduction-absorption-reflection-re-absorption of electromagnetic wave

so that the electromagnetic shielding performance can be optimized. When the CNT content is 5 wt%

the electromagnetic shielding value is 9.57 dB. With the increase of CNT content to 25 wt%

the electromagnetic shielding value can be up to 28.05 dB. In particular

when the CNT content of each coating is 1%

25%

and 1%

10%

25%

respectively

the electromagnetic interference shielding efficiency (EMI SE) can be up to more than 20 dB

with a maximum A-power coefficients value of 0.92. Furthermore

waterborne acrylic resins enables the composite materials to maintain excellent weathering resistance. After 200 h of salt spray test

the electromagnetic shielding effect of the material can still achieve 27.85 dB. Such excellent corrosion resistance makes it promising for use in harsh environments. This work provides a strategy for the development of the preparation of electromagnetic dissipative materials without the need for organic solvents

which is environmentally friendly

simple

efficient and cost-effective.

关键词

阻抗渐变型丙烯酸涂层5G高频波段低反射高效电磁屏蔽

Keywords

Impedance gradientAcrylic acidCoating5G high frequency bandLow reflectivity electromagnetic shielding

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