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Sizing agent for NFC magnetic sheet, preparing method of sizing agent and NFC magnetic sheet

A magnetic sheet and slurry technology, applied in the application of magnetic film to substrate, inductance/transformer/magnet manufacturing, magnets, etc., can solve the problem of high magnetic loss of NFC magnetic sheet, achieve enhanced magnetic permeability and increase resistance rate and reduce the effect of magnetic loss

Inactive Publication Date: 2014-03-12
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of high magnetic loss of NFC magnetic sheets in the prior art, the invention provides a slurry for NFC magnetic sheets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] 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 and nano-alumina powder, and continue ball milling; A3, finally add a defoamer for defoaming, and obtain the slurry for the NFC magnetic sheet.

[0022] 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, nano-alumina powder and organic carrier are uniformly dispersed, the solid powdery binder and other additives (such as dispersant, plasticizer) are first dispersed in a solvent to form an organic solution system, and ball milled After mixing evenly, mix with magnetic powder and nano-alumina powder, and ball mill, and finally add defoamer for defoaming....

Embodiment 1

[0031] The formula of the NFC magnetic sheet is as follows: relative to 100 parts by weight of magnetic powder, the weight of nano-alumina is 0.1 part. With respect to 100 parts by weight of the magnetic powder and nano-alumina, the weight of the organic carrier is 80 parts.

[0032] The formula of the organic vehicle is as follows: in 100 parts by weight of the organic vehicle, 3.37 parts of polyvinyl butyral (PVB) (bonding agent), 13.47 parts of ethyl cellulose (bonding agent), 49.67 parts of toluene (solvent) , 29.68 parts of ethanol (solvent), 0.56 parts of n-butanol (defoamer), 0.73 parts of hydrogenated castor oil (dispersant), 2.52 parts of terpineol (plasticizer).

[0033]The production process is as follows: 1. Weigh the above-mentioned raw materials according to the above formula; 2. First mix various organic substances, put them into a planetary ball mill, and ball mill at a speed of 400r / min for 1 hour; 3. Then mix FeSiAl magnetic powder and nano-alumina Add the p...

Embodiment 2

[0035] The formula of the NFC magnetic sheet is as follows: relative to 100 parts by weight of the magnetic powder, the amount of nano-alumina is 0.05 parts. With respect to 100 parts by weight of magnetic powder and nano-alumina, the organic carrier is 80 parts.

[0036] The formula of the organic vehicle is as follows: in 100 parts by weight of the organic vehicle, 3.37 parts of polyvinyl butyral (PVB) (bonding agent), 13.47 parts of ethyl cellulose (bonding agent), 49.67 parts of toluene (solvent) , 29.68 parts of ethanol (solvent), 0.56 parts of n-butanol (defoamer), 0.73 parts of hydrogenated castor oil (dispersant), 2.52 parts of terpineol (plasticizer).

[0037] The manufacturing process is the same as in Example 1, and the magnetic sheet B is obtained.

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Abstract

The invention provides a sizing agent for an NFC magnetic sheet and a preparing method of the sizing agent. The sizing agent comprises magnetic powder and an organic carrier, and further comprises nanometer alumina powder, wherein the mass ratio of the nanometer alumina powder to the magnetic powder is 0.0005: 0.005. The invention further provides the NFC magnetic sheet prepared through the sizing agent. By means of the added nanometer alumina, the number of bridge connection among the magnetic powder is effectively reduced, the specific resistance rate of the magnetic sheet is increased, the imaginary part, namely the magnetic loss, of the complex permeability is obviously reduced within the range allowed by the reducing of the real part of the complex permeability, accordingly the quality factor of the whole magnetic sheet is improved, and the magnetic effect of the magnetic sheet is improved.

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] NFC is a wireless technology initiated by Philips and jointly promoted by famous manufacturers such as Nokia and Sony. It was originally just a combination of remote control identification and network technology, but now it has developed into a wireless connection for easy, safe and rapid communication. Technology plays a huge role in areas such as access control, public transportation, and mobile payment. [0003] The NFC mobile phone has a built-in NFC chip, which forms a part of the RFID module. It can be used as an RFID passive tag for payment; it can also be used as an RFID reader for data exchange and collection. [0004] When there is no external interference, data transmission and reading and writing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/44H01F1/33H01F41/02H01F7/00
CPCH01F1/16H01F41/02H01F1/44H01F1/33H01F1/0027H01F41/16H01F1/28H01Q17/00H01Q1/2216Y10T428/2848H01F27/36H01F27/361B32B2250/00H01F1/01H01F41/14
Inventor 李华王绍隆
Owner BYD CO LTD
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