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Slurry for NFC (Near Field Communication) magnetic sheet and NFC magnetic sheet

A magnetic sheet and slurry technology, applied in the direction of magnetic materials, magnetic objects, permanent magnets, etc., can solve the problems of small thickness and low product yield that are difficult to form, and achieve the goals of preventing powder settlement, uniform density, and improving production yield Effect

Active Publication Date: 2014-06-04
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 technical problem that it is difficult to form a product with a small thickness and the product yield is low in the NFC magnetic sheet slurry in the prior art in the process of forming an NFC magnetic sheet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Weigh raw materials: nickel zinc ferrite powder (powder particle size D 50 =1.2μm, the specific surface area is 10m 2 / g), 200g; dispersant: triethanolamine, 1.2g; binder: PVB with a molar mass of 100,000g / mol, containing 8g; plasticizer: dibutyl phthalate and polyethylene with a molar mass of 600g / mol Alcohol (mass ratio 1:1), 3g; organic solvent: mixed solvent of absolute ethanol and xylene (mass ratio 1:2), 90.8g.

[0036] (2) Put the dispersant, organic solvent, and ferrite powder into the ball mill tank in sequence, and then perform a ball mill after adding the grinding balls. The ball milling speed is 200rpm, and the ball milling time is 24h.

[0037] (3) Add plasticizer and binder in turn, and conduct secondary ball milling with the ball milling speed at 200 rpm and ball milling time for 24 hours.

[0038] (4) Take out the mixing system in the ball mill tank, filter out the grinding balls, and carry out vacuum stirring and defoaming; the stirring speed is 8...

Embodiment 2

[0041] The same steps as in Example 1 were used to prepare the NFC magnetic sheet slurry S2 (solid content: 60wt%) and NFC magnetic sheet S20 (thickness: 0.08mm) of this example, the difference is:

[0042] In step (1), weigh the raw material: nickel-zinc-copper ferrite powder (powder particle size D 50 =1.2μm, the specific surface area is 10m 2 / g), 200g; dispersant: triethanolamine, 2g; binder: PVB with a molar mass of 100,000g / mol, containing 10g; plasticizer: dibutyl phthalate and polyvinyl alcohol with a molar mass of 600g / mol (mass ratio is 1:1), 6g; organic solvent: mixed solvent of absolute ethanol and xylene (mass ratio is 1:2), 115.3g.

Embodiment 3

[0044] The same steps as in Example 1 were used to prepare the NFC magnetic sheet slurry S3 (solid content: 75wt%) and NFC magnetic sheet S30 (thickness: 0.1mm) of this example, the difference being:

[0045] In step (1), weigh the raw material: nickel-zinc-copper ferrite powder (powder particle size D 50 =1.2μm, the specific surface area is 10m 2 / g), 200g; dispersant: citric acid, 0.6g; binder: PVB with a molar mass of 100,000g / mol, containing 6g; plasticizer: dibutyl phthalate and polyethylene with a molar mass of 600g / mol Alcohol (mass ratio 1:1), 2g; organic solvent: mixed solvent of butanone and trichloroethane (mass ratio 2:1), 58g.

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Abstract

The invention provides slurry for a NFC (Near Field Communication) magnetic sheet. The slurry for the NFC magnetic sheet comprises ferrite powder and an organic system. The slurry is prepared by the following steps: sequentially adding a dispersant, an organic solvent and the ferrite powder into a ball-milling tank for primary ball-milling; then, sequentially adding a plasticizer and a bonder for secondary ball-milling; and selectively adding or not adding an assistant, and defoaming in vacuum to obtain the slurry for the NFC magnetic sheet. The invention further provides the NFC magnetic sheet prepared from the slurry for the NFC magnetic sheet by tape casting. The slurry for the NFC magnetic sheet provided by the invention can effectively solve the problem that the thin magnetic sheet is sintered and warped by optimizing types and adding sequence of components and technical conditions in the organic system in the tape casting formula, thereby greatly enhancing the product yield.

Description

technical field [0001] The invention belongs to the field of near field communication (NFC, near field communication), and in particular relates to a slurry for an NFC magnetic sheet and an NFC magnetic sheet. Background technique [0002] With the development of the electronic communication industry, certain electronic products such as mobile phones have become more and more powerful and perfect due to their functions, such as NFC (near field communication for mobile payment), especially in some developed countries abroad, NFC modules have become the factory standard configuration of mobile phones. In order to meet people's growing demand for more convenient and faster consumption, the research on magnetic chips used for NFC has gradually attracted people's attention and attention. Due to the development of modern electronic products in the direction of small, thin and light, its internal structure design will become more and more compact, which requires the NFC magnetic sh...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/632C04B35/622H01F1/00H01F7/02
Inventor 刘梦辉王营向其军
Owner BYD CO LTD
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