Flexible electromagnetic wave shielding material and manufacturing method therefor

一种屏蔽材料、电磁波的技术，应用在屏蔽材料、磁场/电场屏蔽、分散在不导电无机材料中的导电材料等方向，能够解决难以表现伸缩性、柔软性不足、难以完全表现电磁波屏蔽性能等问题，达到容易采用、伸缩性卓越、优秀电磁波屏蔽性能的效果

Active Publication Date: 2019-07-30
AMOGREENTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, an example of the electromagnetic wave shielding material may be a metal cover or a metal plate. This electromagnetic wave shielding material is difficult to show stretchability, and once manufactured, it is not easy to deform into various shapes / restoration, so it is difficult to be used in various applications. ease of adoption
In particular, electromagnetic wave shielding materials such as metal plates or metal films are difficult to adhere to components that are sources of electromagnetic waves or components that need to be protected from sources of electromagnetic waves without gaps. cracks, it will be difficult to fully express the electromagnetic wave shielding performance
[0006] In order to solve this problem, an electromagnetic wave shielding material in which a conductive coating is formed on a lightweight support member such as a polymer film has recently been introduced. There are limitations in terms of performance. Due to the lack of flexibility, films with a predetermined thickness are difficult to fit tightly on parts with staggered layers and unevenness. After being made into a specific shape, it is difficult to deform the shape freely. In the case of deformation, even when the shape is deformed, there are problems such as frequent cracks and peeling of the coated conductive coating

Method used

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  • Flexible electromagnetic wave shielding material and manufacturing method therefor
  • Flexible electromagnetic wave shielding material and manufacturing method therefor
  • Flexible electromagnetic wave shielding material and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] First, in order to prepare a spinning solution, polyvinylidene fluoride and polyurethane were mixed in a weight ratio of 1:1 as a fiber-forming component, and in 85 g of dimethylacetamide and acetone at a weight ratio of 70:30, in 80 At a temperature of °C, 15 g of the fiber-forming component was dissolved for 6 hours using a bar magnet to prepare a mixed solution. In the mixed solution, 50 parts by weight of nickel rods (rods) having an average diameter of 1 μm and an average length of 2.5 μm were mixed using a mixer with respect to 100 parts by weight of the fiber-forming component. Put the spinning solution into the solution box of the electrospinning device, and spit it out at a speed of 15 μl / min / hole. At this time, the temperature in the spinning section is kept at 30°C, the humidity is kept at 50%, the distance between the collector and the tip of the spinning nozzle is 20cm, and a high voltage generator is used to apply 40kV or more to the spinning nozzle group ...

Embodiment 2～22 and comparative example 1～3

[0070] The same implementation and manufacture as in Example 1, but as shown in Table 1 to Table 4 below, the thickness and weight of the nanofibrous web, the content of metal particles, the porosity of the conductive nanofibrous web, the thickness of the metal layer, and the stretchable member were changed. The thickness, etc., manufactured the flexible electromagnetic wave shielding materials shown in Table 1 to Table 4.

experiment example 1

[0072] The following physical properties were measured for the flexible electromagnetic wave shielding materials manufactured in Examples and Comparative Examples, and are shown in Tables 1 to 4 below.

[0073] 1. Elasticity (elastic recovery rate) evaluation

[0074] For the flexible electromagnetic wave shielding material manufactured according to the embodiment and the comparative example, by UTM (Universal Testing Machine (Universal Testing Machine), Instron Corporation, 3343), make it stretch 50% and remove the external force, according to the following mathematical formula 1 Evaluate scalability.

[0075] [mathematical formula 1]

[0076] Elasticity (elastic recovery rate) (%) = [(lengthened by external force) - (length after removal of external force)] / [(lengthened by external force) - (initial length)] × 100 (%) )

[0077] 2. Initial electromagnetic wave shielding performance

[0078] Regarding the flexible electromagnetic wave shielding materials manufactured ac...

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Abstract

A flexible electromagnetic wave shielding material is provided. The electromagnetic wave shielding material according to one embodiment of the present invention comprises: a conductive nanofiber web having a nanofiber web formed of nanofibers and including a plurality of pores and a metal layer covering a part of the nanofibers disposed on a surface portion of the nanofiber web, in which metal particles are provided on at least a part of the pores; and an elastic member bonded to one surface of the metal layer of the conductive nanofiber web. Due to these features, as the electromagnetic waveshielding material has excellent elasticity, it is possible to freely modify the shape thereof as desired and to attach the electromagnetic wave shielding material to be completely adhered to a surface even if the surface where it is disposed has a curved shape such as uneven or stepped surfaces, and thus it is possible to exhibit excellent electromagnetic wave shielding performance. Further, degradation of the electromagnetic wave shielding performance can be prevented even with various shape changes. Furthermore, even when components are mounted with a high density in a narrow area, the electromagnetic wave shielding material can be provided to completely adhere to the mounted components by overcoming tight spacing and steps between the components, such that the electromagnetic wave shielding material can be easily adopted in compact or flexible electronic devices.

Description

technical field [0001] The invention relates to a flexible electromagnetic wave shielding material, and more specifically, to a flexible electromagnetic wave shielding material and a manufacturing method thereof. Background technique [0002] Electromagnetic waves are a phenomenon in which energy moves in the form of sinusoidal waves while electric and magnetic fields interact with each other, and are usefully used in electronic equipment such as wireless communication or radar. The electric field is generated by voltage and is easily shielded due to long distance or obstacles such as trees. On the contrary, the magnetic field is generated by current and is inversely proportional to distance, but has the characteristic of being difficult to be shielded. [0003] On the other hand, recent electronic equipment is sensitive to electromagnetic interference (EMI) generated by internal or external interference sources of the electronic equipment, and there is a concern that the el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00D01F8/00D01D5/34
CPCH01B1/22H05K9/009D01D5/34D01F8/00H05K9/0022H05K9/0083H05K9/0086
Inventor 徐寅踊丁义荣李俊雨
Owner AMOGREENTECH CO LTD
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