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A kind of low reflection, high absorption electromagnetic shielding material and preparation method thereof

An electromagnetic shielding material and high-absorption technology, which is applied in the preparation of high-absorption electromagnetic shielding leather and low-reflection fields, can solve the problems of electromagnetic wave secondary pollution and low absorption loss of electromagnetic shielding leather, so as to improve absorption performance and ensure wearability , the effect of enhancing dielectric loss and magnetic loss performance

Active Publication Date: 2021-02-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there has been research on using natural leather as an absorbing substrate to prepare electromagnetic shielding leather by surface coating powder conductive materials (patent number: ZL201510704631.6). The surface conductivity of this electromagnetic shielding natural leather can be as high as 1.21×10 5 S / m, although the shielding effectiveness (SE) of the electromagnetic shielding leather in the X-band (8-12 GHz) is 90 dB, the absorption loss (SE) of the electromagnetic shielding leather A ) is low, and the ratio of absorption loss to shielding performance (SE A %) is only 40%, indicating that most of the electromagnetic waves are reflected back to free space to cause secondary pollution

Method used

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  • A kind of low reflection, high absorption electromagnetic shielding material and preparation method thereof
  • A kind of low reflection, high absorption electromagnetic shielding material and preparation method thereof
  • A kind of low reflection, high absorption electromagnetic shielding material and preparation method thereof

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Embodiment 1

[0040] A low reflection, high absorption electromagnetic shielding leather

[0041] The manufacture method of the low-reflection and high-absorption electromagnetic shielding material based on natural leather of the present embodiment is characterized in that it proceeds in the following steps:

[0042] The manufacture method of high absorption electromagnetic shielding material based on natural leather is characterized in that it is carried out according to the following steps and conditions:

[0043] (1) Take a natural leather of a certain size, use vegetable tannin as a carrier, and introduce 20% magnetic nano-ferric oxide particles into the natural leather by the weight of the wet skin;

[0044] (2) Coat the nano-silver-coated copper powder on the surface of the high-absorption leather obtained in (1), and the consumption of the nano-silver-coated copper powder is 6mg cm -2 , that is, low reflection, high absorption electromagnetic shielding leather.

[0045] Such as fi...

Embodiment 2

[0047] A low reflection, high absorption electromagnetic shielding leather

[0048] The manufacture method of the low-reflection and high-absorption electromagnetic shielding material based on natural leather of the present embodiment is characterized in that it proceeds in the following steps:

[0049] (1) Take a natural leather of a certain size, introduce 10% pyrrole monomer based on the weight of wet skin into the natural leather, add the initiator ferric chloride, and polymerize at 0-5°C for 30-60 minutes to form Conductive polypyrrole;

[0050] (2) Coating graphene

[0051] On the surface of the high absorption leather obtained in (1), the amount of graphene is 2 mg cm -2 , that is, low reflection, high absorption electromagnetic shielding leather.

[0052] Such as image 3 and Figure 4 As shown, the surface conductivity of this low reflection, high absorption electromagnetic shielding leather is 8.96×10 2 S / m, the total shielding effectiveness (SE) exceeds 40 dB...

Embodiment 3

[0054] A low reflection, high absorption electromagnetic shielding leather

[0055] The manufacture method of the low-reflection and high-absorption electromagnetic shielding material based on natural leather of the present embodiment is characterized in that it proceeds in the following steps:

[0056] (1) Take a certain size of natural leather, 20% Ag by wet hide weight + After being mixed with vegetable tannins, it is brought into the interior of natural leather through the method of "retanning", and the reduction reaction is carried out at 60-80 ℃ for 60 minutes;

[0057] (2) Coat the silver-coated copper powder on the surface of the high-absorption leather obtained in (1), and the amount of silver-coated copper powder is 4 mg cm -2 , that is, low reflection, high absorption electromagnetic shielding leather.

[0058] Such as Figure 5 and Figure 6 As shown, the surface conductivity of this low reflection, high absorption electromagnetic shielding leather is 4.66×10 ...

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Abstract

The invention discloses a low-reflection, high-absorption electromagnetic shielding material and a preparation method thereof. The electromagnetic shielding material is made of natural leather (sheepskin, cowhide, pigskin) made of livestock animal skins as a basic material, through retanning, In situ polymerization and finishing processes, materials with high electromagnetic wave absorption and attenuation properties (including electrical loss type nano metal particles, magnetic loss type nano metal particles, conductive polymers) are filled inside the natural leather, and then the conductive materials are used It is prepared by coating on the surface of leather, thereby improving the electromagnetic wave absorption performance of the existing electromagnetic wave shielding leather. The electromagnetic shielding material prepared by the method of the invention has extremely high electromagnetic wave absorption performance, can adjust the absorption intensity of electromagnetic waves as required, and has a simple preparation process.

Description

technical field [0001] The invention belongs to the technical field of functional leather and its preparation, and in particular relates to a preparation method of low-reflection and high-absorption electromagnetic shielding leather. Background technique [0002] With the rapid development of modern electronic technology and the wide application of wireless communication equipment, electromagnetic radiation has brought increasingly serious problems such as electromagnetic pollution, electromagnetic interference and information leakage (Wen, B.; Cao, M. S.; Lu, M. M.; et al. Reduced graphene oxides: Light-weight and high-efficiency electromagnetic interference shielding at elevated temperatures[J]. Advanced Materials, 2014,26(21): 3484-3489.). According to statistics, the world's space electromagnetic energy increases by an average of 7%-14% per year (Gao Yougang, Zhang Suhui. Biological Effects of Electromagnetic Radiation [J]. Safety and Electromagnetic Compatibility. 2002,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C11/00B05D5/12C14C3/02
CPCB05D5/12C14C3/02C14C11/003
Inventor 廖学品刘畅石碧
Owner SICHUAN UNIV
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