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High-permeability magnetic film and preparation method thereof

A magnetic thin film, high magnetic permeability technology, applied in the direction of magnetic thin film, magnetic film to substrate application, magnetic layer, etc., can solve the problem of increasing the thickness of the whole electronic product, unfavorable product miniaturization and low cost, and increasing the production process and cost issues, to achieve high magnetic permeability, good shielding performance, and reduce the thickness of the whole machine

Active Publication Date: 2017-04-26
东莞易力禾电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above two situations require electromagnetic shielding absorbing materials. The traditional method is to add an electromagnetic shielding layer outside the flexible circuit board, but this method undoubtedly increases the thickness of the electronic product, and increases the production process and cost at the same time, which is not conducive to the small size of the product. and low cost requirements

Method used

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Examples

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preparation example Construction

[0018] According to the above-mentioned high magnetic permeability magnetic film of the present invention, the present invention provides a kind of preparation method of high magnetic permeability magnetic film, the high magnetic permeability magnetic film involved in this method can be described with the above-mentioned embodiment of high magnetic permeability magnetic film The technical features are the same and can produce the same technical effect. The preparation method of the high magnetic permeability magnetic thin film of the present invention uses liquid polymer, magnetic particles and required additives, and after mixing evenly, uses a casting machine to cast and dry to make a green tape, and the obtained green tape is passed through several times. The process of heating, heat preservation and rolling is finally made into a magnetic film product. The magnetic film made by this method can be directly made into a flexible copper clad laminate (FCCL), or made into a flex...

Embodiment 1

[0029] Weigh 100 parts of polyimide solution with a solid content of 20%, weigh 380 parts of flaky sendust powder, soak the sendust powder in 10% phosphoric acid solution for phosphating treatment for 2 hours, wash and dry it with Mix the polyimide solution, then add 1% dispersant, 0.5% defoamer, and 5% thixotropic agent according to the total mass ratio of the mixture, mix in the mixer for 120min, and finally place it in a vacuum defoamer for defoaming get slurry;

[0030] The obtained slurry is poured into the tape casting machine hopper, the distance between the scraper of the tape casting machine and the steel strip is adjusted to be 0.5mm, and the moving speed of the steel strip is 5m / min, and the heating and drying temperature in the tape casting machine is adjusted to Tape casting and drying at 120°C to obtain a raw tape;

[0031] Introduce the heated and dried raw tape into the first double-roller sheeting mechanism of the first heating roller press channel to make a ...

Embodiment 2

[0035] Weigh 100 parts of polyimide solution with a solid content of 20%, weigh 400 parts of iron-based nanocrystalline crushed powder and mix with PI solution, then add 1.5% dispersant and 0.5% defoamer according to the total mass ratio of the mixture , 8% thixotropic agent, 10% thickener, mixed in a mixer for 120min, and finally placed in a vacuum defoaming machine to defoam to obtain a slurry;

[0036] Pour the prepared slurry into the hopper of the casting machine, adjust the distance between the scraper and the steel belt to 0.6mm, the moving speed of the steel belt to 3m / min, and adjust the heating and drying temperature in the casting machine to 120°C Tape casting and drying are carried out to obtain a raw tape;

[0037] Introduce the heated and dried raw tape into the first double-roller sheeting mechanism of the first heating roller press channel to make a semi-finished film, set the heating temperature in the first heating roller press channel to 180°C, The distance...

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Abstract

The invention discloses a high-permeability magnetic film and preparation method thereof. The high-permeability magnetic film comprises magnetic particles with weight ratio of 90-99.5% and polymer with weight ratio of 0.5-10%. The liquid-state polymer, the magnetic particles and the additives are uniformly mixed and then casted and dried by use of a casting machine to manufacture a rough belt, the obtained rough belt is repeatedly heated, insulated and rolled to finally manufacture a magnetic film product; the magnetic film manufactured by use of the method disclosed by the invention can be directly manufactured as a flexible copper-clade plate, or manufactured as a flexible circuit board through other manners; and meanwhile, the entire thickness off an electronic product is lowered since the material has high permeability and good shielding property, and the cost is lowered at the same time.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a high-permeability magnetic thin film and a preparation method thereof. Background technique [0002] With the rapid development of electronic technology, people have higher and higher requirements for light, thin, short and small consumer electronic products. As a special electronic interconnection technology, flexible circuit board (FPC) technology has significant advantages in this respect. In addition to static bending, it can also be dynamically bent, curled and folded. Its market demand is increasing year by year. trend. [0003] In the process of using the flexible circuit board, the electromagnetic interference phenomenon that inevitably occurs is becoming more and more serious. In order to suppress this electromagnetic interference and protect other electronic components in the electronic circuit, it is necessary to conduct EMI monitoring on the flexible cir...

Claims

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Application Information

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IPC IPC(8): H01F10/13H01F10/14H01F41/28B29C69/02B29L7/00
CPCB29C69/02B29L2007/00H01F10/138H01F10/145H01F41/28
Inventor 尧巍华宋秀鹏
Owner 东莞易力禾电子有限公司
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