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A kind of flexible pu graphene electromagnetic shielding material and preparation method thereof

An electromagnetic shielding material, graphene technology, applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve the problems of difficult surface resistance of conductive coatings, difficult to form conductive paths, multiple reflection losses, etc., to achieve excellent shielding efficiency and enhance adhesion. Intensity, wide range of effects

Inactive Publication Date: 2020-06-12
HUNAN GUOSHENG GRAPHITE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 3) Multiple reflection loss
However, after the graphene is dispersed in the resin, it is difficult to form a "bridging" contact between the graphene sheets, that is, it is difficult to form a perfect conductive path, and there is a large contact resistance at the junction of the sheets. , making it difficult to further reduce the surface resistance of the conductive coating formed by it

Method used

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  • A kind of flexible pu graphene electromagnetic shielding material and preparation method thereof
  • A kind of flexible pu graphene electromagnetic shielding material and preparation method thereof
  • A kind of flexible pu graphene electromagnetic shielding material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A preparation method of flexible PU graphene electromagnetic shielding material, comprising the following steps:

[0057] (1) First wipe the PU film with a thickness of 0.02 mm, and then undergo appropriate corona treatment to form small pores on the surface of the film, reaching a certain roughness, and increasing the adhesion strength of the subsequent graphene-coated film;

[0058] (2) Add water-based acrylic resin, graphene slurry, defoamer, and leveling agent with a mass ratio of 1:0.55:0.004:0.045 to the vacuum mixer in sequence, adjust the negative pressure to -0.04mpa, and the speed to 1200r / min, and the stirring time is 3 hours; the solvent water in the graphene slurry is better compatible with the water-based acrylic resin, and the graphene and water-based acrylic resin are evenly dispersed under the action of the high-speed shear stirring paddle;

[0059] The graphene slurry includes graphene, water and a dispersant, and the mass ratio of the graphene, water...

Embodiment 2

[0064] A preparation method of flexible PU graphene electromagnetic shielding material, comprising the following steps:

[0065] (1) First wipe the PU film with a thickness of 0.4 mm, and then undergo appropriate corona treatment to form small pores on the surface of the film, reaching a certain roughness, and increasing the adhesion strength of the subsequent graphene-coated film;

[0066] (2) Add water-based acrylic resin, graphene slurry, defoamer, and leveling agent with a mass ratio of 1:0.65:0.006:0.055 to the vacuum mixer in sequence, adjust the negative pressure to -0.06mpa, and the speed to 1800r / min, and the stirring time is 6 hours; the solvent water in the graphene slurry is better compatible with the water-based acrylic resin, and the graphene and water-based acrylic resin are evenly dispersed under the action of the high-speed shear stirring paddle;

[0067] The graphene slurry includes graphene, water and a dispersant, and the mass ratio of the graphene, water ...

Embodiment 3

[0072] A preparation method of flexible PU graphene electromagnetic shielding material, comprising the following steps:

[0073] (1) First, wipe clean the PU film with a thickness of 0.2 mm. When processing, use a dust-free cloth soaked in absolute ethanol solution to wipe clean the front and back sides. After the PU film is completely dry, use a corona machine to properly treat the PU film. Corona treatment, the surface of the film forms fine pores, reaches a certain roughness, and increases the adhesion strength of the subsequent graphene coating film;

[0074] (2) Add water-based acrylic resin, graphene slurry, defoamer, and leveling agent with a mass ratio of 1:0.6:0.005:0.05 into the vacuum mixer in sequence (weigh 10g of water-based acrylic resin, 6g Graphene slurry, 0.05g of defoamer, 0.5g of GSK-550 polyether modified siloxane leveling agent were added to the vacuum mixer in sequence), and the negative pressure was adjusted to -0.05mpa, and the speed was 1600r / min , t...

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Abstract

The invention relates to the technical field of electromagnetic shielding materials, in particular to a flexible PU graphene electromagnetic shielding material and a preparation method thereof. The preparation method comprises the steps of corona treatment of a flexible PU film, viscous slurry preparation, viscous slurry scraping and coating, and drying and the like. According to the preparation method, the waterborne acrylic resin is used as a binder and the graphene and nano-silver powder are used for forming a conductive access. Compared with the prior art, the method has the following advantages: the process for preparing the electromagnetic shielding material is simple; the process is a environment-friendly one; scraping and coating become uniform; the made finished product is flexible and foldable; the electromagnetic shielding performance is excellent; and the flexible PU graphene electromagnetic shielding material and the preparation method thereof have the broad market prospects.

Description

technical field [0001] The invention relates to an electromagnetic shielding material, especially a graphene-based flexible electromagnetic shielding material and a preparation method and application thereof. Background technique [0002] With the development of information technology and electronic industry, electronic information products are used in all walks of life and can be seen everywhere. While promoting rapid economic and social development, it also brings increasingly serious electromagnetic pollution. In order to avoid the interference of electromagnetic wave radiation on electronic and electrical products, improve the stability and accuracy of electronic and electrical products. In addition to the need to correctly design circuits and rationally layout electronic components, using electromagnetic shielding materials to implement radiation protection is an effective method. [0003] Electromagnetic shielding, that is, using the reflection and attenuation of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00
CPCH05K9/0083
Inventor 林前锋
Owner HUNAN GUOSHENG GRAPHITE TECH CO LTD
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