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Broadband flexible magnetic conductive film, and preparation method thereof

A flexible and magnetically permeable technology, applied in the field of electromagnetic wave-absorbing and magnetically permeable materials, can solve the problems that the high-frequency magnetic sensitive function of the device cannot be exerted, it is difficult to maintain the magnetic permeability, and the magnetic loss is high, and achieves high resistance, excellent magnetic permeability, and flexibility. Good results

Inactive Publication Date: 2019-02-26
JIANGSU JINYI ADVANCED MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of the soft magnetic metal powder bonded film is closely related to its production process, and the performance change is greatly affected by the process. Usually, it is still difficult to maintain the excellent magnetic permeability at 1 GHz and higher frequencies, or the magnetic loss is too high. The high-frequency magnetic sensitivity function of the device cannot be exerted, thus limiting its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1. A kind of magnetically permeable thin film of low energy loss, makes through the following steps:

[0025] In the first step, (BuCp) with a molar ratio of 1:1 2 ZrCl 2 and IndCpZrCl 2The composition and triethylaluminum are used as a catalyst, and hexane is used as a reaction medium, so that the mass percentage of Zr in the system is 0.35%, the mass percentage of Al is 15.5%, and 1-hexene is used as a comonomer, and the ethylene pressure is Polyolefins were synthesized under the conditions of 10 MPa and polymerization temperature of 84 °C, and polyolefin solids with a weight average molecular weight of 152,100 and a ratio of weight average molecular weight to number average molecular weight of 3.07 were isolated;

[0026] In the second step, the obtained polyolefin solid is crushed and ground into powder;

[0027] The third step is to put the polyolefin powder and the flat Fe-Si-Al soft magnetic powder with a flatness of 60 and a Si content of 9% in two...

Embodiment 2

[0030] Example 2. Cut the material obtained in Example 1 into concentric circles, and test the complex permeability and complex permittivity on a Keysight E4991B impedance analyzer. The real part of the measured complex permeability is µ’=40@1MHz, µ’=18 @1 GHz; the imaginary part of the complex permeability is µ’’=1.5 @1 MHz, µ’’=4.5 @1 GHz.

[0031] Then use a Qi standard wireless charging module with a rated power of 5 W and a rated frequency of 125 kHz to measure the magnetic isolation and magnetic permeability of the material: connect the transmitter part of the module to the digital display voltage source, and set the output voltage to 5V. Cut the material obtained in Example 1 into a circle that can cover the matching receiving coil, and cover it on the receiving coil. The matching receiver coil of the cover material is charged with the transmitter connected to a voltage source. When charging, connect the receiving end to the load meter, and adjust the resistance of th...

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Abstract

The invention provides a broadband flexible magnetic conductive film. The broadband flexible magnetic conductive film is prepared through tight compression of flat soft magnetic powder onto polyolefinwith a weight average molecular weight larger than 150000, wherein the ratio of the weight average molecular weight to the number-average molecular weight of the polyolefin ranges from 1.88 to 4.28.In the preparation process, at least one of roll calendering of 50t or higher is carried out. In preparation of the broadband flexible magnetic conductive film, at least to chlorination metallocene Zrcomplex compounds and an organo aluminium compound are taken as catalysts, under heating and pressure increasing conditions, synthesis of polyolefin according with requirements is realized; a doublescrew extruder is adopted in mixing with the flat soft magnetic powder, sheet materials obtained through extruding are subjected to pressurization treatment so as to obtain a finished product. The mu'value of the broadband flexible magnetic conductive film at frequency higher than 1GHz is maintained to be larger than 15, and the mu'' value is 5 or lower. The broadband flexible magnetic conductivefilm is suitable to be used for radio frequency identification, wireless charging, and high frequency combination.

Description

technical field [0001] The invention relates to the field of electromagnetic wave-absorbing and magnetic-guiding materials, in particular to a flexible wave-absorbing and magnetic-guiding thin film that can work in a wide frequency range. Background technique [0002] In modern electronic devices and communication equipment, electromagnetic interference from outside the device and electromagnetic leakage inside the device will seriously affect the function of the device and the stability of the device. In order to avoid these interferences, measures are usually taken to design appropriate filtering, coupling, shielding, grounding and other circuits and components in electronic circuits to minimize the interference. But some disruptions are still unavoidable. At this time, the interfering electromagnetic wave can be absorbed, guided or transformed into other energy forms by the wave-absorbing and magnetic-conducting material. Commonly used wave-absorbing magnetic materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08K7/00C08J5/18
CPCC08J5/18C08J2323/08C08K7/00C08K2201/01
Inventor 王鹏王悦周东山王晓亮薛琦
Owner JIANGSU JINYI ADVANCED MAGNETIC MATERIAL CO LTD