Sizing agent for near field communication (NFC) magnetic sheet, manufacturing method thereof and NFC magnetic sheet

A magnetic sheet and slurry technology, which is applied to the magnetism of organic materials/organic magnetic materials, inductance/transformer/magnet manufacturing, magnets, etc., can solve the problem of increased thickness of magnetic sheets, poor consistency of slurry, and uneven distribution of magnetic powder on magnetic sheets. Equal problem, to achieve the effect of small change in the thickness of the magnetic sheet, increase in magnetic permeability, and uniform distribution of magnetic powder

Active Publication Date: 2013-10-30
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the problems in the prior art that resin and rubber are used in the preparation process of the NFC magnetic sheet, resulting in poor consistency of the slurry, uneven distribution of magnetic powder in the formed magnetic sheet, and changes in the thickness of the magnetic sheet in a high-temperature and high-humidity environment. big technical problem

Method used

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  • Sizing agent for near field communication (NFC) magnetic sheet, manufacturing method thereof and NFC magnetic sheet
  • Sizing agent for near field communication (NFC) magnetic sheet, manufacturing method thereof and NFC magnetic sheet

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preparation example Construction

[0019] The present invention also provides a preparation method for the slurry for the NFC magnetic sheet, comprising the following steps: A1, first mixing the binder, solvent, dispersant and plasticizer in proportion, and ball milling to obtain the mixture; A2, then pouring the mixture Add magnetic powder into the mixture, and continue ball milling; A3, finally add a defoamer for defoaming, and obtain the slurry for the NFC magnetic sheet.

[0020] In general, it is sufficient to directly mix the components evenly during the preparation of the slurry. In the present invention, in order to ensure that the magnetic powder and the organic carrier are evenly dispersed, the solid powdery binder and other additives (such as dispersants, plasticizers) are first dispersed in a solvent to form an organic solution system, and after ball milling until uniformly mixed, Then mix with magnetic powder, and ball mill, and finally add defoamer for defoaming.

[0021] Preferably, in step A1, ...

Embodiment 1

[0030] (1) Weigh raw materials: magnetic powder: 132 parts by weight of FeSiAl alloy powder;

[0031] Organic carrier: a total of 100 parts by weight, including: 3.37 parts by weight of PVB, 13.47 parts by weight of EC, 49.67 parts by weight of toluene, 29.68 parts by weight of ethanol, 0.56 parts by weight of n-butanol, 0.73 parts by weight of hydrogenated castor oil, and 2.52 parts by weight of terpineol .

[0032] (2) Mix PVB, EC, toluene, ethanol, hydrogenated castor oil and terpineol first, and ball mill at a speed of 400r / min for 1 hour in a planetary ball mill; then add magnetic powder, and continue ball milling at a speed of 400r / min for 3 hours; Then, n-butanol was added for vacuum defoaming for 3 hours, the vacuum degree was -0.09 MPa, and the defoaming speed was 70 r / min to obtain the slurry S1 for NFC magnetic sheet of this embodiment.

[0033] (3) Cast the slurry S1 on a tape casting machine with a scraper height of 0.8mm and a speed of 10m / min to obtain a cast s...

Embodiment 2

[0035] The NFC magnetic sheet S20 of this embodiment is prepared in the same steps as in Example 1, the difference is that:

[0036] In step (1), the magnetic powder: FeNi alloy powder, the dosage is 100 parts by weight;

[0037] Organic carrier: a total of 100 parts by weight, including: 2.84 parts by weight of PVB, 14 parts by weight of EC, 49.67 parts by weight of toluene, 29.68 parts by weight of ethanol, 0.56 parts by weight of n-butanol, 0.73 parts by weight of hydrogenated castor oil, and 2.52 parts by weight of terpineol ;

[0038] In step (2), after adding magnetic powder, the ball milling speed is 350r / min, and the ball milling time is 4h; after adding polyether modified silicon defoamer, the vacuum defoaming is 4h, the vacuum degree is -0.05MPa, and the defoaming speed is 50r / min.

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Abstract

The invention provides a sizing agent for a near field communication (NFC) magnetic sheet and a manufacturing method thereof. The sizing agent for the NFC magnetic sheet is composed of magnetic powder and organic carriers. The organic carriers contain 15-20wt% of adhesives, 75-83.8wt% of solvents, 0.1-1wt% of defoaming agents, 0.1-1wt% of dispersing agents and 1-5wt% of plasticizers. The adhesives are polyvinyl butyral and/or ethyecellulose. The invention further provides an NFC magnetic sheet manufactured by the sizing agent. The adhesives made of the powder polyvinyl butyral and/or ethyecellulose can replace resin and rubber in the prior art, so that production cycle of the NFC magnetic sheet can be shortened. Magnetic conductivity of the NFC magnetic sheet manufactured by the sizing agent is improved, magnetic powder is evenly distributed, and the magnetic sheet is small in thickness changing in a high-temperature high-humidity environment.

Description

technical field [0001] The invention belongs to the field of near field communication (NFC, near field communication), and specifically relates to a slurry for an NFC magnetic sheet, a preparation method thereof, and an NFC magnetic sheet. Background technique [0002] At present, there are more and more mobile communication devices with NFC functions, such as mobile phones and notebooks. During the communication process, the metal parts in the device will interfere with the NFC antenna, causing the electromagnetic waves emitted by the NFC antenna to be absorbed by the metal to generate eddy current loss, thereby affecting the communication distance. In order to shield the metal and enhance the communication distance, it is necessary to place a magnetic piece between the NFC antenna and the metal part. The real part of the magnetic permeability of the magnetic piece must be large enough, and the imaginary part must be small enough to play its due role. Due to the requiremen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/42H01F7/00H01F41/02
Inventor 李华向其军
Owner BYD CO LTD
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