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Polymer conductive film with adjustable electromagnetic shielding performance and its preparation method

A conductive film, electromagnetic shielding technology, applied in the direction of magnetic field/electric field shielding, electrical components, etc., can solve the problems of poor interface compatibility, inconvenient method, increase the mechanical brittleness of polymer conductive film materials, etc., to achieve good mechanical properties and The effect of flexibility, improving mechanical strength, and good electromagnetic shielding performance

Inactive Publication Date: 2017-03-15
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, thin effective thickness, excellent mechanical flexibility and strength are very important for polymer conductive composite electromagnetic shielding materials, but it is still difficult to prepare polymer conductive film materials with excellent mechanical flexibility and strength. It is because the polymer conductive film material needs a high filling amount of carbon nanofillers in order to have ideal shielding effectiveness, but du

Method used

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  • Polymer conductive film with adjustable electromagnetic shielding performance and its preparation method
  • Polymer conductive film with adjustable electromagnetic shielding performance and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 3g of graphene and 12g of thermoplastic polyurethane (TPU) were added to 120mL of N,N-dimethylformamide at a mass ratio of 1:4, and a TPU / TPU with a graphene content of 20wt% was prepared by solution blending. Graphene composite dispersion, the viscosity of the composite dispersion is 383mPa s;

[0024] The above-mentioned TPU / graphene composite dispersion is brushed on both sides of a polyester non-woven fabric with a thickness of 100 microns, and a polymer / graphene conductive film with a conductive coating thickness of 25 microns is obtained after drying the solvent. The tensile strength of the above-mentioned film is 60 MPa, and it does not break after being folded in half repeatedly for 1000 times.

[0025] The above polymer / graphene conductive film is zigzag folded to obtain a polymer conductive film with a zigzag structure, and the folded optical photo is as follows figure 1 As shown, the sawtooth side length L is 15 mm, and the sawtooth angle can be changed betw...

Embodiment 2

[0027] Compared with Example 1, other preparation steps are the same, the only difference is that when the polymer / graphene conductive film is zigzag folded, the zigzag side length L is 10 mm, and the zigzag structure formed after folding is stretched or compressed To achieve the change of the sawtooth angle between 180 and 0 degrees, the electromagnetic shielding effectiveness test is carried out in the C-band (frequency 5.38-8.17GHz), and the results are as follows figure 2 Shown in B. The results show that the electromagnetic shielding effectiveness of the material can be adjusted by simply stretching or compressing the sawtooth structure of the polymer conductive film to change the sawtooth angle. When the sawtooth angle changes from 180 degrees to 33.7 degrees, the average electromagnetic shielding effectiveness of the material Varies between 16.0dB and 34.3dB.

Embodiment 3

[0029] Compared with Example 1, other preparation steps are the same, the only difference is that when the polymer / graphene conductive film is zigzag folded, the zigzag side length L is 5 mm, and the zigzag structure formed after folding is stretched or compressed To achieve the change of the sawtooth angle between 180 and 0 degrees, the electromagnetic shielding effectiveness test is carried out in the C-band (frequency 5.38-8.17GHz), and the results are as follows figure 2 C shown. The results show that the electromagnetic shielding effectiveness of the material can be adjusted by simply stretching or compressing the sawtooth structure of the polymer conductive film to change the sawtooth angle. When the sawtooth angle changes from 180 degrees to 33.7 degrees, the average electromagnetic shielding effectiveness of the material Varies between 16.0dB and 27.2dB.

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Abstract

The invention provides a polymer conductive film with adjustable electromagnetic shielding performance and its preparation method. The polymer conductive film material is provided with an interlayer structure formed by a reinforced interlayer and a conductive coating layer and boasting excellent intensity and flexibility. Through the zigzag folding to the polymer conductive film material and through the simple stretching or compressing to the zigzag structure to change the zigzag angle, it is possible to change the electromagnetic shielding performance of the material in the end so as to achieve effective control of the electromagnetic shielding performance. The conductive film can be applied in areas or devices that require simple and effective control over the attenuation degree of electromagnetic waves. The method can be operated simply and conveniently and blazes a new path for preparing a highly intense and flexible polymer conductive film material with adjustable electromagnetic shielding performance.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave shielding, in particular to a polymer conductive film with adjustable electromagnetic shielding performance and a preparation method thereof. Background technique [0002] Electromagnetic interference refers to the phenomenon that harmful electromagnetic waves interfere with or cause obstacles to the normal functions of electronic devices, referred to as EMI (electromagnetic interference), which generally refers to radio waves, magnetic waves, light waves, sunspots and other natural interference from space. With the rapid development of the modern electronics industry, the number of various wireless communication systems and high-frequency electronic devices has increased sharply, resulting in the increase of electromagnetic interference and the increasingly prominent problem of electromagnetic pollution. On the one hand, electromagnetic radiation will cause serious interference to th...

Claims

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Application Information

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IPC IPC(8): H05K9/00
CPCH05K9/0081
Inventor 沈斌郑文革李洋蓝小琴
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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