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Novel NFC magnetic sheet slurry and preparation method thereof

A slurry and magnetic sheet technology, applied in the field of new NFC magnetic sheet slurry and its preparation, can solve problems such as environmental pollution, damage to human health, and deterioration of working conditions, and achieve the goals of reducing water content, reducing preparation costs, and solving settlement Effect

Inactive Publication Date: 2015-07-08
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Xylene, as toluene-like organic matter, is a highly toxic organic solvent, and a large amount of discharge during casting will seriously pollute the environment, deteriorate working conditions and damage human health.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh raw materials: nickel-copper-zinc ferrite powder (average particle size is 0.8 micron), 800g; surface treatment agent is titanate, 10g; water is 300g; adhesive is water-based polyurethane with a solid content of 30%, 330g ; Defoamer is 1g;

[0025] Put titanate, ferrite powder and water into the ball mill jar, add zirconia balls for a ball mill, the speed is 150rpm, and the ball mill time is 2h;

[0026] Then add adhesive and defoamer, carry out secondary ball milling, ball milling speed is 230rpm, ball milling time is 4h;

[0027] The slurry after the secondary ball milling was taken out, the zirconia balls were filtered, and vacuum degassing was performed; the degassing time was 3 hours, and the slurry L1 for NFC magnetic sheet was obtained.

Embodiment 2

[0029] Weigh raw materials: nickel-zinc ferrite powder (average particle size is 0.9 micron), 800g; surface treatment agent: silane, 8g; water is 350g; adhesive: solid content is 50% water-based polyurethane, 190g; defoamer 0.9g;

[0030] Put silane, ferrite powder and water into the ball mill tank, add zirconia balls for a ball mill, the speed is 200rpm, and the ball mill time is 2.5h;

[0031] Then add adhesive and defoaming agent, carry out secondary ball milling, ball milling speed is 250rpm, ball milling time is 5h;

[0032] The slurry after the secondary ball milling was taken out, the zirconia balls were filtered, and vacuum defoaming was carried out; the defoaming time was 3 hours, and the slurry L2 for NFC magnetic sheet was obtained.

Embodiment 3

[0034] Weighing raw materials: nickel-copper-zinc ferrite powder (average particle size is 0.8 micron), 800g; surface treatment agent: silane, 8g; water is 320g; adhesive: solid content is 40% water-based polyurethane, 240g; defoaming The agent is 0.9g; the leveling agent is 1.2g;

[0035] Put silane, ferrite powder and water into the ball mill tank, add zirconia balls for a ball mill, the speed is 250rpm, and the ball mill time is 1.5h;

[0036] Then add adhesive and defoaming agent, add leveling agent at the same time, carry out second ball milling, ball milling speed is 280rpm, ball milling time is 3.5h;

[0037] The slurry after the secondary ball milling was taken out, the zirconia balls were filtered, and vacuum defoaming was carried out; the defoaming time was 3 hours, and the slurry L3 for NFC magnetic sheet was obtained.

[0038] Use L1, L2, and L3 slurries for casting to prepare ferrite green sheets, with a thickness of 0.08mm, a width of 130mm, a drying temperature...

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PUM

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Abstract

The invention discloses novel NFC magnetic sheet slurry and a preparation method thereof. The novel NFC magnetic sheet slurry is composed of ferrite powder and aqueous system, and the aqueous system includes water, surface treating agent, adhesive and anti-foaming agent; the novel NFC magnetic sheet slurry is prepared through steps that (1) putting the surface treating agent, ferrite powder and water in a ball milling tank, and performing primary ball milling; (2) after the primary ball milling, adding anti-foaming agent and adhesive, and performing secondary ball milling; (3) taking out slurry after the secondary ball milling, and performing vacuum defoamation to obtain the NFC magnetic sheet slurry. The novel NFC magnetic sheet slurry and the preparation method thereof have beneficial effects that the environmental requirement is satisfied, and the preparation cost can be lowered; the content of the ferrite powder in the slurry system can be effectively improved, and accordingly the water content is lowered, the water volatilization efficiency can be improved, the magnetic powder content of the ferrite raw piece can be improved, and the magnetic performance of the magnetic piece is improved; the sedimentation problem of the ferrite powder in water base slurry can be effectively solved, and the product sintering yield is improved after using the water base slurry.

Description

technical field [0001] The invention relates to the technical field related to engine nacelles, in particular to a novel NFC magnetic sheet slurry and a preparation method thereof. Background technique [0002] In the prior art, NFC (Near Field Communication, near field communication) magnetic sheet processes include extrusion molding, compression molding and tape casting. However, the extrusion molding process uses a slurry with low magnetic powder content, and the density of the magnetic sheet after sintering is relatively low, and the magnetic performance is poor; while the compression molding process cannot prepare a thin magnetic sheet with a thickness of less than 0.1mm. [0003] The tape casting process is currently the most commonly used process for NFC thin magnetic sheets. The existing casting slurry is mainly composed of ferrite powder and an organic system, and then the slurry is used to prepare a ferrite green sheet with a thickness of less than 0.1mm, and a fe...

Claims

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Application Information

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IPC IPC(8): H01F1/36
Inventor 金江剑於扬栋徐琛何蓉艳
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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