Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of electromagnetic shielding film material and preparation method thereof

An electromagnetic shielding film, ultra-thin technology, applied in the direction of magnetic/electric field shielding, electrical components, etc.

Active Publication Date: 2022-04-12
FUDAN UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite the aforementioned advantages of yolk-shell microspheres, how to construct yolk-shell microspheres without sacrificial-free templates in a gentle manner remains a great challenge so far.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of electromagnetic shielding film material and preparation method thereof
  • A kind of electromagnetic shielding film material and preparation method thereof
  • A kind of electromagnetic shielding film material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of hydrogel microspheres: Disperse 0.3 g of acrylamide monomer in 50 mL of ethanol, under the condition of nitrogen protection, raise the temperature to 70 °C and stir for 1 h, add 0.1 g of potassium persulfate, and stir for 12 h at 70 °C to form Uniform lotion. Finally, hydrogel microspheres were prepared by centrifugal separation and deionized water washing.

Embodiment 2

[0038] Preparation of hydrogel microspheres: Disperse 0.7 g of N-isopropylacrylamide monomer in 25 mL of deionized water and 25 mL of pyrrolidone. Under nitrogen protection, heat up to 100°C and stir for 20 hours, then add 0.05 g of azo Diisobutyl imidazole hydrochloride was stirred at 100°C for 48 h to form a uniform emulsion. Finally, the poly(N-isopropylacrylamide) microspheres were prepared by centrifugal separation and deionized water washing.

Embodiment 3

[0040] Preparation of hydrogel microspheres: Disperse 3 g of methacryloyl gelatin monomer in 50 mL of isopropanol and 50 mL of propylene glycol methyl ether acetate, under nitrogen protection, heat up to 60 °C and stir for 1 h, add 0.1 g azobisisobutyronitrile, stirred at 60°C for 50 h to form a uniform emulsion. Finally, hydrogel microspheres were prepared by centrifugal separation and deionized water washing.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses an ultra-thin electromagnetic shielding film material and a preparation method thereof, belonging to the technical field of functional materials. The present invention adopts emulsion polymerization method, or dispersion polymerization method, or suspension polymerization method to synthesize charged composite microspheres with core-shell structure with shrinkable soft core and hard shell; electrostatic interaction with conductive two-dimensional nanosheets with opposite charges Self-assembled to obtain composite microspheres with a core-shell structure coated with conductive nanosheets on the surface; using hydrogen bonds and van der Waals forces between the two-dimensional nanosheets to obtain film materials after film formation; after drying, composite microspheres with a core-shell structure A cavity is introduced inside the ball to obtain an ultra-thin electromagnetic shielding film material with a multilayer structure of polymer-air-polymer-conductive nanosheets. The film exhibits excellent wave-absorbing performance in the entire X-band, with a thickness of 25 microns The shielding effectiveness of the film material can be greater than 65 dB, and the shielding effectiveness value of the full X-band can be greater than 30dB, which can be used in radar, communication, aerospace, various electronic products, wearable devices and other fields.

Description

technical field [0001] The invention discloses an electromagnetic shielding film material and a preparation method thereof, belonging to the technical field of functional materials. Background technique [0002] In today's society, the rapid development of modern electronic technology not only brings convenience to people, but also produces a large number of negative effects. In addition to electromagnetic environment interference and equipment failure, excessive electromagnetic waves will also have a greater impact on the health of users. Therefore, the development of high-performance electromagnetic wave shielding materials has become the key to solving electromagnetic wave pollution. Although traditional metal materials have good electromagnetic shielding performance, their high density and easy corrosion limit their further application. With the advent of the high-frequency and high-speed 5G era and the development of wearable devices, new electromagnetic shielding mater...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08L51/00C08L51/02C08L33/26C08L33/24C08L55/00C08L5/04C08L67/04C08K7/00C08K3/28C08K3/14C08J5/18H05K9/00C08F265/10C08F220/18C08F220/14C08F212/08C08F220/20C08F289/00
CPCC08J5/18H05K9/0081C08F265/10C08F289/00C08J2351/00C08J2351/02C08J2333/26C08J2333/24C08J2355/00C08J2305/04C08J2467/04C08K7/00C08K3/28C08K3/14C08K2201/011C08F220/1804C08F220/14C08F212/08C08F220/20
Inventor 游波李晨溪
Owner FUDAN UNIV