Electromagnetic characteristics of copper⁃powder⁃doped polyurethane coating and absorbing properties of its coated fabric

doi:10.19491/j.issn.1001-9278.2022.09.007

Abstract

Abstract:

An absorbing coating fabric was fabricated by coating a micron⁃copper⁃powder⁃doped polyurethane （PU） layer on the cotton fabric. The structure and performance of the coated fabric were investigated using scanning electron microscope， infrared spectrum， and vector network analyzer. The results indicated that the real and imaginary parts of the dielectric constant increase in the band range of 8~13 GHz with an increase in the copper powder content in the coating. This suggests that the copper powder generated good dielectric properties for the coating due to the presence of polarization under the applied electric field， producing dielectric loss to the electromagnetic wave. Copper powders do not belong to a magnetic loss material， resulting in a small magnetic loss to electromagnetic wave. The absorption and electromagnetic shielding performance of the coating materials were weak at a small weight fraction of copper powder （3 wt%）. When the content of copper powder increased from 5 wt% to 11 wt%， the lowest reflection losses of the coated fabric were -20.4， -28.3， -25.6 dB at 9.0， 10.5， 12.8 GHz， respectively， and its effective absorption bandwidths were 0.2， 1.3， 1.1 GHz. The electromagnetic shielding efficiency increased from 12.24， 16.59， 21.1 to 25.92 dB.

Key words: polyurethane coating, micro copper powder, cotton fabric, dielectric constant, magnetic permeability, reflection loss

CLC Number:

TQ320.67⁺2

ZHANG Mengxing, LIU Rangtong, LI Liang, LI Shujing, LIU Shuping. Electromagnetic characteristics of copper⁃powder⁃doped polyurethane coating and absorbing properties of its coated fabric[J]. China Plastics, 2022, 36(9): 46-52.

Figures/Tables 7

Fig.1. Different copper powder coating fabric morphology

Fig.2. FTIR spectra of pristine and coated cotton fabric

Fig.3. XRD patterns of the coated cotton fabrics with different copper powder contents

Fig. 4. Electromagnetic parameters of samples with different copper powder contents

Fig.5. Electromagnetic loss of samples with different contents of copper powder

Fig.6. Reflection loss of coated fabric with different copper powder contents

Fig.7. Electromagnetic shielding efficiency of coating materials with different copper powder contents

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