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Method for preparing flexible stretchable conductive film with electromagnetic shielding function

A conductive film, electromagnetic shielding technology, applied in the field of materials, can solve the problems of low shielding efficiency, high density, mutual interference of high-frequency electromagnetic waves, etc., and achieve high electromagnetic interference shielding efficiency, process cost reduction, and good wettability.

Inactive Publication Date: 2019-05-14
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-frequency electromagnetic waves generated by the complex and diverse internal components will interfere with each other, affecting the accuracy and effectiveness of signal processing and transmission
Although the metal sheet has excellent electrical conductivity and electromagnetic shielding effectiveness, it cannot meet the requirements of flexibility and good stretchability, and the density is too large
[0003] Some studies have sintered metal nanowires and nanoparticles (such as silver nanowires, silver powder) on flexible substrates (such as PET), or deposited metal materials on flexible substrates by physical and chemical vapor phase to prepare flexible substrates. film, but the sintered layer of this film itself is not flexible, the cyclic bending and twisting performance of the substrate is poor, and it is not stretchable
There are also studies that have connected conductive materials (metal nanowires and particles, graphene, carbon nanotubes, etc.) to stretchable elastic polymer substrates (SBS, WPU, rubber, etc.), but the problems with these films are: Either the electromagnetic shielding effect is too low (20dB), or the stretchability is not good (maximum elongation 50%), the two cannot be balanced
The fabric prepared by this scheme does not have stretchability, and the shielding effectiveness is lower than the scheme of the present invention

Method used

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  • Method for preparing flexible stretchable conductive film with electromagnetic shielding function
  • Method for preparing flexible stretchable conductive film with electromagnetic shielding function
  • Method for preparing flexible stretchable conductive film with electromagnetic shielding function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] refer to figure 1 , figure 2 As shown, preparation tools and raw materials: rectangular frame molds of different thicknesses, scrapers, flat bases; polydimethylsiloxane (PDMS), silver nanoparticles, nickel nanoparticles.

[0037] 1) Preparation of fluid polymer materials: select the main agent and curing agent for preparing PDMS, mix them evenly at a mass ratio of 10:1, and remove air bubbles in a vacuum box;

[0038] 2) Preparation of the base: first assemble the mold 1 (thickness 0.5 mm) on the base to form a cuboid groove. Then the fluid state polymer material prepared in step 1) is injected into the tank, and its cross section is shown as figure 2 shown. Then the whole is put into a blast drying oven, and the set temperature and time are respectively 50° C. and 120 min.

[0039]3) Preparation of functional adhesive: take a certain amount of the fluid polymer material prepared in step 1) and pour it into a container, add nickel nanoparticles, then add silver na...

Embodiment 2

[0043] refer to figure 1 , figure 2 As shown, preparation tools and raw materials: rectangular frame molds of different thicknesses, scrapers, flat bases; polydimethylsiloxane (PDMS), silver nanoparticles.

[0044] 1) Preparation of fluid polymer materials: select the main agent and curing agent for preparing PDMS, mix them evenly at a mass ratio of 10:1, and remove air bubbles;

[0045] 2) Preparation of the base: first assemble the mold 1 (thickness 0.5 mm) on the base to form a cuboid groove. Then the fluid state polymer material prepared in step 1) is injected into the tank, and its cross section is shown as figure 2 shown. Then the whole is put into a blast drying oven, and the set temperature and time are respectively 50° C. and 110 min.

[0046] 3) Preparation of functional glue: take a certain amount of the fluid polymer material prepared in step 1) and pour it into a container, add silver nanoparticles, and then mix evenly by means of ultrasonic dispersion and m...

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Abstract

The present invention relates to the technical field of materials, and in particular relates to a method for preparing a flexible stretchable conductive film with an electromagnetic shielding function. The method comprises uniformly mixing conductive materials (including metal nanowires and nanoparticles, carbon nanotubes, graphene, etc.) with a fluid state polymer (for example, polydimethylsiloxane, PDMS), and preparing a functional glue with excellent electrical conductivity and electromagnetic shielding effectiveness, at the same time preparing a solid stretchable flexible (PDMS) substrateand then attaching the functional glue to the substrate. The conductive film obtained has excellent features of high electromagnetic interference shielding performance (70dB), recyclability (20,000 times), high stretchability (up to 340% for strain of the PDMS), and excellent electrical conductivity (surface resistance (0.2 Omega) etc..

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing a flexible and stretchable conductive film with an electromagnetic shielding function. Background technique [0002] A new generation of portable, wearable, and wireless terminal electronic devices has begun to popularize, which puts forward high requirements for the lightweight and flexibility of conductive materials. Many signal ports in electronic devices are non-planar, requiring materials with good stretchability. The high-frequency electromagnetic waves generated by the complex and diverse internal components will interfere with each other, affecting the accuracy and effectiveness of signal processing and transmission. Although the metal sheet has excellent electrical conductivity and electromagnetic shielding performance, it cannot meet the requirements of flexibility and good stretchability, and its density is too high. [0003] Some...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B5/14H01B1/24H01B1/22
Inventor 赵维巍冯鹏栋
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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