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Leather with electromagnetic shielding performance and preparing method thereof

An electromagnetic shielding and leather technology, applied in the field of natural leather preparation, can solve the problem of high hardness, achieve the effect of improving conductivity, improving shielding and ensuring conductivity

Active Publication Date: 2016-01-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of composite material has excellent chemical corrosion resistance, it has high hardness, and there are still many problems to be solved in the optimal combination of thickness of each layer and the bonding between layers.

Method used

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  • Leather with electromagnetic shielding performance and preparing method thereof
  • Leather with electromagnetic shielding performance and preparing method thereof
  • Leather with electromagnetic shielding performance and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing leather (sheep) with electromagnetic shielding properties:

[0030] A. Take sheep leather, add 4g / m 2 Polymethyl methacrylate (PMMA) on the leather surface area is evenly sprayed on the leather surface and dried;

[0031] B. Add 18g / m 2 The nano-silver-coated copper powder (particle size 40-800nm) on the surface of the leather is dispersed in ethanol and ultrasonically dispersed for 30 minutes to obtain a dispersion;

[0032] C. Press the product obtained in step A for 4 seconds at 8MPa and 70°C, then evenly spray the dispersion obtained in step B and dry it;

[0033] D. Spray evenly a layer of 7g / m on the surface of the product obtained in step C 2 The PMMA of the leather surface area is dried to obtain leather with electromagnetic shielding properties.

[0034] tested as figure 1 As shown, the surface conductivity of the leather with electromagnetic shielding performance of the present embodiment is 1.21×10 5 S / m, the total electromagnetic...

Embodiment 2

[0036] A preparation method of leather (buffalo) with electromagnetic shielding properties:

[0037] A. Take buffalo leather, add 2g / m 2 The PMMA of leather surface area is evenly sprayed on this leather surface, dry;

[0038] B. Add 10g / m 2 Nano metal copper powder (particle size 50-600nm) on the leather surface area is dispersed in acetone, and ultrasonically dispersed for 60 minutes to obtain a dispersion;

[0039] C. Press the product obtained in step A at 2MPa and 40°C for 2s, then evenly spray the dispersion obtained in step B and dry it;

[0040] D. Evenly spray a layer of 3g / m on the surface of the product obtained in step C 2 Polyurethane (PU) of leather surface area, dry, is natural leather with electromagnetic shielding properties.

[0041] tested as figure 2 As shown, the surface conductivity of this electromagnetic shielding natural leather is 2.81×10 3 S / m, SE in the frequency range of 0.5-3GHz total over 48dB, where SE A Up to 30dB, SE R Up to 20dB; te...

Embodiment 3

[0043] A method for preparing leather (cow) with electromagnetic shielding properties:

[0044] A. Take the cow leather, add 6g / m 2 The PU of the leather surface area is evenly sprayed on the leather surface and dried;

[0045] B. Add 16g / m 2 Nano ferric oxide powder (particle size 200-700nm) on the surface of the leather is dispersed in deionized water and ultrasonically dispersed for 90 minutes to obtain a dispersion;

[0046] C. Press the product obtained in step A for 25 seconds at 4MPa and 60°C, then evenly spray the dispersion obtained in step B and dry it;

[0047] D. Evenly spray a layer of 5g / m on the surface of the product obtained in step C 2 Amino tetrafunctional epoxy resin (EP) on the surface area of ​​the leather is dried to obtain leather with electromagnetic shielding properties.

[0048] tested as image 3 As shown, the surface conductivity of this electromagnetic shielding leather is 3.72×10 4 S / m, SE in the frequency range of C-band (4-8GHz) total ov...

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Abstract

The invention discloses an electromagnetic shielding material which is prepared by using natural leather (sheep skin, cattle skin and pig skin) made by the skin of livestock as a base material and has electromagnetic wave absorbing and reflecting performance. The method comprises the steps of first, uniformly spraying a film forming agent on the surface of leather at the density of 2-10 g / m<2> of leather surface area and conducting drying; then, under the conditions of 2-10 MPa and 40-90 DEG C, conducting iron-pressing for 2-30s; next, dispersing nanometer metal powder (silver, copper, silver coated copper, ferroferric oxide, nickel and zinc within a size range of 10nm-900mm) into a non-reaction neutral solvent (ethanol, acetone and deionized water) at the density of 2-20 g / m<2> of leather surface area, dispersing for 30-90 min through ultrasonic waves, uniformly spraying the dispersion liquid on the surface of the iron-pressed leather, and conducting drying; and finally, spraying one layer of film forming agent again at the density of 2-10 g / m<2> of leather surface area, and after drying, obtaining the natural leather having electromagnetic shielding performance.

Description

technical field [0001] The invention relates to the preparation of natural leather with electromagnetic shielding performance. Background technique [0002] With the development of science and technology and the electronic industry, the application of various electronic equipment is increasing day by day, and electromagnetic wave radiation has become a new social public hazard, which will not only affect the normal operation of various electronic equipment, but also endanger the health of the body (J.M.Thomassin , C. Jéröme, T. Pardoen, C. Bailly, I. Huynen, C. Detrembleur. Mat. Sci. Eeg. R; 2013, 74:211-232.). [0003] The main application scope of electromagnetic shielding materials includes: in the military field, to prevent confidential signals from being received by the enemy, to prevent hidden places from being discovered, and to prevent electromagnetic wave signals from being stolen by the enemy, which plays a role in security protection; Electromagnetic wave interfe...

Claims

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Application Information

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IPC IPC(8): C14C9/00
Inventor 廖学品刘畅黄鑫周建飞石碧曾运航
Owner SICHUAN UNIV
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