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

Electromagnetic shielding sheet and manufacturing method thereof

A technology of electromagnetic shielding and manufacturing methods, applied in the fields of magnetic field/electric field shielding, chemical instruments and methods, electrical components, etc., can solve the problems of NFC resonance frequency change, process and production cost increase, and affect WPC charging efficiency, etc., and reach the adjustment range Wide, wide frequency range effect

Active Publication Date: 2021-02-02
SUNWAY COMM JIANGSU CO LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] After the design of the NFC antenna coil is determined, the task of adjusting the NFC resonant frequency falls on the magnetic isolation sheet, and the NFC coil designed by the solution provider is often designed in conjunction with a magnetic isolation sheet with a certain specification. Once the raw material batch of the magnetic isolation sheet is adjusted This will cause a change in the resonant frequency of the NFC, which has caused great trouble to the supplier of the magnetic isolation sheet
For nanocrystalline magnetic spacers, the traditional adjustment method is mainly to adjust the frequency by adjusting the heat treatment process of nanocrystalline materials, but this will affect the charging efficiency of WPC, and will also increase the process and production costs.
Amorphous electromagnetic shielding sheets cannot meet the needs of NFC, so it is urgent to find a new type of material to effectively adjust the resonance frequency of NFC

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
  • Electromagnetic shielding sheet and manufacturing method thereof
  • Electromagnetic shielding sheet and manufacturing method thereof
  • Electromagnetic shielding sheet and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment one of the present invention is:

[0032] A method for manufacturing an electromagnetic shielding sheet, comprising the steps of:

[0033] 1. Preparation of adhesive:

[0034] Mix 1-5 parts by weight of silane coupling agent with 20-25 parts by weight of organic solvent to obtain a pre-dispersion liquid; mix 1-40 parts by weight of nano-ferrite powder and 2-8 parts by weight of thickener The agent is added to the pre-dispersion liquid respectively to obtain a prepared dispersion liquid; 30-60 parts by weight of acrylic ester monomers, 10-20 parts by weight of alkanes and 15-30 parts by weight of organic solvents are mixed, Obtain a polymerization solution; mix the prepared dispersion liquid and the polymerization solution to obtain a polymerization mixture, and then add 5 to 15 parts by weight of matrix resin, 1 to 5 parts of azo compounds and 1 to 5 parts by weight respectively to the polymerization mixture. 5 parts of N-nitroso compound to obtain adhesive...

Embodiment 2

[0047] Embodiment 2 of the present invention is a manufacturing method of an electromagnetic shielding sheet, which is different from Embodiment 1 in that:

[0048] 1. Preparation of adhesive:

[0049] Mix 3 parts by weight of silane coupling agent with 22 parts by weight of organic solvent to obtain a pre-dispersion; add 20 parts by weight of nano-ferrite powder and 5 parts by weight of thickener to the pre-dispersed In the liquid, the prepared dispersion liquid is obtained; 40 parts by weight of acrylate monomers, 15 parts by weight of alkanes and 22 parts by weight of organic solvents are mixed to obtain a polymerization solution; the preparation of the dispersion liquid and the polymerization solution is carried out Mix to obtain a polymerization mixture, and then add 11 parts by weight of matrix resin, 2 parts of azo compounds and 3 parts of N-nitroso compounds to the polymerization mixture to obtain an adhesive.

[0050] 2. Preparation of pressure sensitive tape

[005...

Embodiment 3

[0053] Embodiment 3 of the present invention is a manufacturing method of an electromagnetic shielding sheet, which is different from Embodiment 1 in that:

[0054] 1. Preparation of adhesive:

[0055] Mix 1 part by weight of silane coupling agent with 20 parts by weight of organic solvent to obtain a pre-dispersion; add 1 part by weight of nano-ferrite powder and 8 parts by weight of thickener to the pre-dispersed In the liquid, the prepared dispersion liquid is obtained; 30 weight parts of acrylic ester monomers, 20 weight parts of alkanes and 15 weight parts of organic solvents are mixed to obtain a polymerization solution; the modulation dispersion liquid and the polymerization solution are carried out Mix to obtain a polymerization mixture, and then add 5 parts by weight of matrix resin, 1 part of azo compound and 5 parts of N-nitroso compound to the polymerization mixture to obtain an adhesive.

[0056] 2. Preparation of pressure sensitive tape

[0057] The coating thi...

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
Resonant frequencyaaaaaaaaaa
Login to View More

Abstract

The invention discloses an electromagnetic shielding sheet and a manufacturing method thereof. The manufacturing method comprises: mixing a silane coupling agent with an organic solvent to obtain a pre-dispersion; adding nanometer ferrite powder and a thickener to the pre-dispersion , to obtain a modulated dispersion; mix an acrylate monomer, an alkane compound, and an organic solvent to obtain a polymerization solution; mix the modulated dispersion with the polymerization solution, and then add matrix resin, azo compounds, and N-substrate A nitro compound to obtain an adhesive; apply the adhesive to one side of the substrate layer to obtain a pressure-sensitive adhesive tape; stick one side of the amorphous or nanocrystalline tape to the side of the pressure-sensitive adhesive coated with the adhesive Combined, and then patterned the magnetic sheet to obtain an electromagnetic shielding sheet. By adjusting the amount of nano-ferrite powder to adjust the magnetic spectrum of the electromagnetic shielding sheet, it can match different types of WPC and NFC coils at the same time, and the adjustment range is wide, which can be applied to a wider frequency range.

Description

technical field [0001] The invention relates to the technical field of electromagnetic shielding, in particular to an electromagnetic shielding sheet and a manufacturing method thereof. Background technique [0002] With the rapid development of the modern electronics industry, electronic appliances and radio communications are widely used, and electromagnetic radiation has become another major public hazard after noise pollution, air pollution, water pollution and solid waste pollution. Electromagnetic waves not only interfere with the normal operation of various electronic equipment, threaten the information security of communication equipment, but also cause great harm to human health. At present, the main method to eliminate electromagnetic wave hazards is to use electromagnetic shielding materials to shield them. Therefore, exploring efficient electromagnetic shielding materials has become an urgent problem to be solved. [0003] At present, the main methods of electr...

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): B32B37/12B32B37/10H05K9/00C09J4/06C09J4/02C09J11/04C09J11/06
Inventor 李家洪王磊徐雨刘开煌徐勇攀汤凤林王雷王帅
Owner SUNWAY COMM JIANGSU CO LTD