CN104766686A - Novel NFC magnetic sheet slurry and preparation method thereof - Google Patents
Novel NFC magnetic sheet slurry and preparation method thereof Download PDFInfo
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- CN104766686A CN104766686A CN201510036961.2A CN201510036961A CN104766686A CN 104766686 A CN104766686 A CN 104766686A CN 201510036961 A CN201510036961 A CN 201510036961A CN 104766686 A CN104766686 A CN 104766686A
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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
The present invention relates to engine nacelle correlative technology field, refer in particular to a kind of novel NFC magnetic sheet slurry and preparation method thereof.
Background technology
In prior art, NFC (Near Field Communication, near-field communication) magnetic sheet technique has extrusion molding, compressing and flow casting molding.But extruding-out process adopts slurry particle content low, after magnetic sheet sintering, density is relatively low, and magnetic property is poor; And compressing technique, the thin magnetic plate of below thickness 0.1mm cannot be prepared.
Casting molding processes is the most frequently used technique of current NFC thin magnetic plate.Existing casting slurry, primarily of ferrite powder and organic system composition, is then prepared with slurry the ferrite raw cook that thickness is less than 0.1mm, is just obtained the ferrite magnetic sheet of excellent performance after sintering.
Existing casting molding processes is produced and is adopted polyvinyl butyral resin (PVB) to make adhesive more, and alcohol and dimethylbenzene make organic solvent.And dimethylbenzene is the organic solvent that toxicity is stronger as toluene type organic, a large amount of discharges meeting serious environment pollutions when curtain coating, worsen condition of work and also damage health.
Summary of the invention
There is above-mentioned deficiency to overcome in prior art in the present invention, provides a kind ofly to reduce preparation cost and novel NFC magnetic sheet slurry of environmental protection and preparation method thereof.
To achieve these goals, the present invention is by the following technical solutions:
A kind of novel NFC magnetic sheet slurry, is made up of ferrite powder and water-based system, containing water, surface conditioning agent, bonding agent and defoamer in described water-based system.
The present invention is the technical problem solving above-mentioned existence, adopts aqueous tape casting forming technique.Aqueous tape casting forming, with water to replace organic solvent, using water as organic solvent, not only meets the requirement of environmental protection, also can reduce preparation cost simultaneously.
As preferably, described water-based system also comprises auxiliary agent.
As preferably, described surface conditioning agent is titanate esters or silane coupler.
As preferably, described bonding agent is aqueous polyurethane family macromolecule.The present invention adopts aqueous polyurethane family macromolecule as aqueous adhesive, effectively can improve ferrite powder content in slurry system, thus reduce water content, not only can improve water volatilization efficiency, ferrite raw cook particle content can also be improved, improve magnetic sheet magnetic property.Ferrite magnetic sheet general thickness is at below 0.1mm in addition, relatively more suitable employing.
In addition, present invention also offers the preparation method of above-mentioned novel NFC magnetic sheet slurry, prepared by following steps:
(1) surface conditioning agent, ferrite powder and water are put into ball grinder, carry out a ball milling;
(2) after a ball milling, add defoamer and bonding agent, carry out secondary ball milling;
(3) after secondary ball milling, take out slurry, carry out vacuum defoamation, obtain NFC magnetic sheet slurry.
Due to, ferrite powder is different with the polarity of bonding agent, if do not carry out active surface process to it, cannot Homogeneous phase mixing between ferrite powder and bonding agent, and make ferrite powder easily in the slurry sedimentation occur.Therefore, the present inventor thinks, before ferrite powder and bonding agent mixing, first should carry out surface treatment to ferrite powder.Slurry is the order of addition of formula of size component by above-mentioned Optimization of preparation, effectively can solve the settlement issues of ferrite powder in water-based slurry, thus improves the yields adopting product sintering after water-based slurry.
As preferably, in step (1), in ball grinder, add zirconia ball carry out a ball milling, rotational speed of ball-mill is 150-250rpm, and Ball-milling Time is 1.5-2.5h.
As preferably, in step (2), while adding defoamer and bonding agent, optionally add auxiliary agent.
As preferably, in step (2), during secondary ball milling, rotational speed of ball-mill is 230-280rpm, and Ball-milling Time is 3.5-5h.
As preferably, in step (3), take out after secondary ball milling, filter zirconia ball, carry out vacuum defoamation, inclined heated plate is 3h.
The invention has the beneficial effects as follows: adopt aqueous tape casting forming technique, with water to replace organic solvent, not only meet the requirement of environmental protection, also can reduce preparation cost simultaneously; Adopt aqueous polyurethane as aqueous adhesive, effectively can improve ferrite powder content in slurry system, thus reduce water content, not only can improve water volatilization efficiency, ferrite raw cook particle content can also be improved, improve magnetic sheet magnetic property; Optimize the order of addition of formula of size component, effectively can solve the settlement issues of ferrite powder in water-based slurry, thus the yields that after improving employing water-based slurry, product sinters.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
Embodiment 1:
Take raw material: nickel copper zinc ferrite powder (average particle size is 0.8 micron), 800g; Surface conditioning agent is titanate esters, 10g; Water is 300g; Bonding agent to be solid content be 30% aqueous polyurethane, 330g; Defoamer is 1g;
Add in ball grinder by titanate esters, ferrite powder and water, add zirconia ball and carry out a ball milling, rotating speed 150rpm, Ball-milling Time is 2h;
Add bonding agent and defoamer again, carry out secondary ball milling, rotational speed of ball-mill is 230rpm, and Ball-milling Time is 4h;
Slurry after secondary ball milling is taken out, filters zirconia ball, carry out vacuum defoamation; Inclined heated plate is 3h, obtains NFC magnetic sheet slurry L1.
Embodiment 2:
Take raw material: nickel-zinc ferrite powder (particle mean size is 0.9 micron), 800g; Surface conditioning agent: silane, 8g; Water is 350g; Bonding agent: solid content is the aqueous polyurethane of 50%, 190g; Defoamer is 0.9g;
Add in ball grinder by silane, ferrite powder and water, add zirconia ball and carry out a ball milling, rotating speed 200rpm, Ball-milling Time is 2.5h;
Add bonding agent and defoamer again, carry out secondary ball milling, rotational speed of ball-mill is 250rpm, and Ball-milling Time is 5h;
Slurry after secondary ball milling is taken out, filters zirconia ball, carry out vacuum defoamation; Inclined heated plate is 3h, obtains NFC magnetic sheet slurry L2.
Embodiment 3:
Take raw material: nickel copper zinc ferrite powder (particle mean size is 0.8 micron), 800g; Surface conditioning agent: silane, 8g; Water is 320g; Bonding agent: solid content is the aqueous polyurethane of 40%, 240g; Defoamer is 0.9g; Levelling agent is 1.2g;
Add in ball grinder by silane, ferrite powder and water, add zirconia ball and carry out a ball milling, rotating speed 250rpm, Ball-milling Time is 1.5h;
Add bonding agent and defoamer again, add levelling agent simultaneously, carry out secondary ball milling, rotational speed of ball-mill is 280rpm, and Ball-milling Time is 3.5h;
Slurry after secondary ball milling is taken out, filters zirconia ball, carry out vacuum defoamation; Inclined heated plate is 3h, obtains NFC magnetic sheet slurry L3.
Carry out curtain coating with L1, L2, L3 slurry respectively and prepare ferrite raw cook, thickness is 0.08mm, and width is 130mm, and baking temperature is 85 DEG C, and base band is the PET film that silane treatment is crossed.Then ferrite raw cook is departed from PET film, be cut into the raw cook being of a size of 120x120x0.08mm, carry out grid soften handled, then carry out sintering preparation.After sintering, the magnetic property of magnetic sheet is followed existing organic system to compare with yields and be there is no gap.
Claims (9)
1. a novel NFC magnetic sheet slurry, is characterized in that, be made up of ferrite powder and water-based system, containing water, surface conditioning agent, bonding agent and defoamer in described water-based system.
2. one according to claim 1 novel NFC magnetic sheet slurry, is characterized in that, described water-based system also comprises auxiliary agent.
3. one according to claim 1 and 2 novel NFC magnetic sheet slurry, is characterized in that, described surface conditioning agent is titanate esters or silane coupler.
4. one according to claim 1 and 2 novel NFC magnetic sheet slurry, is characterized in that, described bonding agent is aqueous polyurethane family macromolecule.
5. a preparation method for novel NFC magnetic sheet slurry as claimed in claim 1 or 2, is characterized in that, prepared by following steps:
(1) surface conditioning agent, ferrite powder and water are put into ball grinder, carry out a ball milling;
(2) after a ball milling, add defoamer and bonding agent, carry out secondary ball milling;
(3) after secondary ball milling, take out slurry, carry out vacuum defoamation, obtain NFC magnetic sheet slurry.
6. the preparation method of novel NFC magnetic sheet slurry according to claim 5, is characterized in that, in step (1), in ball grinder, add zirconia ball carry out a ball milling, rotational speed of ball-mill is 150-250rpm, and Ball-milling Time is 1.5-2.5h.
7. the preparation method of novel NFC magnetic sheet slurry according to claim 5, is characterized in that, in step (2), while adding defoamer and bonding agent, optionally add auxiliary agent.
8. the preparation method of the novel NFC magnetic sheet slurry according to claim 5 or 7, is characterized in that, in step (2), during secondary ball milling, rotational speed of ball-mill is 230-280rpm, and Ball-milling Time is 3.5-5h.
9. the preparation method of novel NFC magnetic sheet slurry according to claim 6, is characterized in that, in step (3), take out after secondary ball milling, and filter zirconia ball, carry out vacuum defoamation, inclined heated plate is 3h.
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| CN201510036961.2A CN104766686A (en) | 2015-01-26 | 2015-01-26 | Novel NFC magnetic sheet slurry and preparation method thereof |
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| CN201510036961.2A CN104766686A (en) | 2015-01-26 | 2015-01-26 | Novel NFC magnetic sheet slurry and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107446539A (en) * | 2017-06-26 | 2017-12-08 | 重庆正峰电子有限公司 | A kind of preparation method being cast with water base compound sticking agent emulsion |
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| JP2009184872A (en) * | 2008-02-06 | 2009-08-20 | Panasonic Corp | Ferrite sintered product and production method therefor |
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| CN103426585A (en) * | 2012-05-24 | 2013-12-04 | 比亚迪股份有限公司 | NFC magnetic sheet, paste for NFC magnetic sheet, and preparation method of paste for NFC magnetic sheet |
| CN103833340A (en) * | 2012-11-27 | 2014-06-04 | 比亚迪股份有限公司 | Slurry for NFC (Near Field Communication) magnetic sheet and NFC magnetic sheet |
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2015
- 2015-01-26 CN CN201510036961.2A patent/CN104766686A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101191304A (en) * | 2007-11-08 | 2008-06-04 | 华明扬 | Method for preparing anti-flaming water-proof ventilate wave-absorbing coating adhesive for military equipment outside covering textile |
| JP2009184872A (en) * | 2008-02-06 | 2009-08-20 | Panasonic Corp | Ferrite sintered product and production method therefor |
| CN101354939A (en) * | 2008-05-04 | 2009-01-28 | 横店集团东磁股份有限公司 | Method for preparing superfine permanent ferrite forming slurry |
| CN103426585A (en) * | 2012-05-24 | 2013-12-04 | 比亚迪股份有限公司 | NFC magnetic sheet, paste for NFC magnetic sheet, and preparation method of paste for NFC magnetic sheet |
| CN102964774A (en) * | 2012-10-16 | 2013-03-13 | 横店集团东磁股份有限公司 | Manufacturing method of soft magnetic alloy composite material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107446539A (en) * | 2017-06-26 | 2017-12-08 | 重庆正峰电子有限公司 | A kind of preparation method being cast with water base compound sticking agent emulsion |
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Application publication date: 20150708 |