CN104177077B - A kind of NFC Magnetic Substrate aqueous casting slurry and preparation method thereof and a kind of NFC Magnetic Substrate - Google Patents
A kind of NFC Magnetic Substrate aqueous casting slurry and preparation method thereof and a kind of NFC Magnetic Substrate Download PDFInfo
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Abstract
The invention discloses a kind of NFC Magnetic Substrate aqueous casting slurry and preparation method thereof and a kind of NFC Magnetic Substrate, belong to near-field communication field, NFC Magnetic Substrate aqueous casting slurry is made up of the raw material of following weight parts: nanoscale ferrite powder: 25 ~ 40; Polyacrylic acid: 0.1 ~ 0.5; Polyvinyl alcohol: 0.5 ~ 1.5; Polyoxyethylene glycol: 0.3 ~ 1.0; Polyether antifoam agent: 0.3 ~ 1.0; Water: 8 ~ 15.The preparation method of slurry comprises and gets the raw materials ready, prepares casting slurry and deaeration is old.The preparation method of NFC Magnetic Substrate comprises flow casting molding and cuts.NFC Magnetic Substrate slurry solvent water of the present invention is good to the wettability of powder, have that volatilization is fast, time of drying is short, slurry remove bubble easily, casting films snappiness better, the advantage that not easy to crack, intensity is high; The preparation method of slurry has easy to prepare, safety, environmental protection, the feature that efficient, cost is low; The Magnetic Substrate even structure adopting this slurry to prepare, intensity is high, snappiness good.
Description
Technical field
The invention belongs to near-field communication (NFC, nearfieldcommunication) field, be specifically related to a kind of NFC Magnetic Substrate aqueous casting slurry and preparation method thereof and a kind of NFC Magnetic Substrate.
Background technology
Near-field communication (NFC, nearfieldcommunication) be initiated by PHILIPS Co., the wireless technology promoted mainly is combined by the well-known manufacturer such as Nokia, Sony, it is only the merging of remote control identification and network technology at first, and developed into now a kind of easily, safety, the wireless connect technology that communicates rapidly, gate inhibition, in the field such as public transport, mobile-phone payment, play huge effect.
NFC Magnetic Substrate is then the significant components that NFC antenna normally can work in metal environment.Due to modern electronic equipment miniaturization and integrated requirement, therefore the thickness of NFC Magnetic Substrate must be very thin, can not take too large space, and require that Magnetic Substrate has certain snappiness, can fit tightly with antenna.At present, external NFC Magnetic Substrate starts industrialization, and domestic NFC Magnetic Substrate is main dependence on import then.Because the green sheet of the NFC Magnetic Substrate of micron order thickness may or be difficult to by compacting or extrusion forming hardly, and by flow casting molding can easily and effectively, large-arealy prepare slim blank.Flow casting molding is as a kind of important forming method, be widely used in ceramic substrate (comprising NFC Magnetic Substrate) and sandwich preparation, and shaping quality affects the heterogeneous microstructure of material to a great extent, determine the performance of product, application and price.Flow casting molding can be divided into water base shaping with non-aqueous tape-casting according to the type of solvent of slurry.
The current comparative maturity of non-aqueous tape-casting moulding process, can prepare the chip multilayer device of various oxide compound, non-oxidized substance.Solvent conventional in casting technique has ethanol, butanone, trieline, toluene etc.The molecular weight of organic solvent, easily volatilizees, and in film process, volatilization completely.In actual production, practical mixed solvent is commonplace, especially binary or ternary azeotropic body.Dispersion agent in industry mainly comprises phosphoric acid ester, ethoxy compound, triglyceride and fish oil.Binding agent conventional in slurry is polyvinyl alcohol butyraldehyde (PVB), polymethyl acrylate and ethyl cellulose etc.Conventional softening agent has polyoxyethylene glycol, phthalic ester and ethylene glycol etc.The diaphragm rate of drying adopting non-aqueous tape-casting moulding process to prepare is fast, shows smooth, and microtexture is even, and diaphragm quality can be well controlled.But organic content is higher, cause diaphragm density low, working condition is severe, causes very large harm to human body and environment.Simultaneously its solvent is all inflammable substance, there is very large potential safety hazard, and production cost is higher in production process, and therefore, to study with safety, clean, low cost production be feature, and aqueous tape casting forming technique has become irreversible trend.
Aqueous tape casting forming technique uses water to substitute organic solvent as solvent, and great majority research at present is all in the experimental phase.And be polar molecule and surface tension is large due to water molecules, and dispersion agent, binding agent, fluidizer, auxiliary agent etc. are organic additives, and there is compatibility problem between water molecules.Therefore, cause that the wettability of the shaping middle water of aqueous tape casting to powder is poor, volatilization is slow and time of drying is long, slurry deaeration is difficult, the defects such as casting films snappiness is poor, easy to crack, and intensity is low.
Summary of the invention
The object of the invention is to the shortcoming overcoming prior art, a kind of NFC Magnetic Substrate aqueous casting slurry is provided, this slurry solvent water is good to the wettability of powder, have that volatilization is fast, time of drying is short, slurry remove bubble easily, casting films snappiness better, the advantage that not easy to crack, intensity is high.
Another object of the present invention is to the preparation method providing a kind of NFC Magnetic Substrate aqueous casting slurry, the method has easy to prepare, safety, environmental protection, the feature that efficient, cost is low.
Another object of the present invention is to provide a kind of NFC Magnetic Substrate, and this NFC Magnetic Substrate adopts aqueous tape casting forming technique to be prepared from, and the Magnetic Substrate even structure of preparation, intensity are high, snappiness good.
Object of the present invention is achieved through the following technical solutions:
A kind of NFC Magnetic Substrate aqueous casting slurry, it is made up of the raw material of following weight parts:
Nanoscale ferrite powder: 40 ~ 81; Polyacrylic acid: 0.1 ~ 0.5;
Polyvinyl alcohol: 0.5 ~ 1.5; Polyoxyethylene glycol: 0.3 ~ 1.0;
Polyether antifoam agent: 0.3 ~ 1.0; Water: 8 ~ 15.
Further, the grain diameter of described nanoscale ferrite powder is 300 ~ 500nm.
Nanoscale ferrite powder adopts high magnetic permeability prepared by conventional oxide technique, the ambrose alloy zinc nanoscale ferrite powder that low loss performance is excellent.
The preparation method of above-mentioned NFC Magnetic Substrate aqueous casting slurry, it comprises the following steps:
S1. get the raw materials ready: take each raw material according to the above ratio, for subsequent use;
S2. casting slurry is prepared: nanoscale ferrite powder load weighted in step S1, polyacrylic acid, polyvinyl alcohol, polyoxyethylene glycol, water are mixed rear ball milling 20 ~ 30h, and rotational speed of ball-mill is 300 ~ 500r/min, obtains casting slurry;
S3. deaeration is old: the casting slurry prepared by step S2 crosses 100 ~ 200 mesh sieves, under the subnormal ambient of 0.1 ~ 0.3MPa, vacuum defoamation 8 ~ 15h is carried out after adding polyether antifoam agent, and carry out old process by 1 ~ 2h/L, control viscosity at 10000 ~ 15000cps, obtained NFC Magnetic Substrate aqueous casting slurry.
A kind of NFC Magnetic Substrate, described NFC Magnetic Substrate is prepared from by following methods:
(1) flow casting molding: the NFC Magnetic Substrate aqueous casting slurry described in claim 1 or 2 is carried out curtain coating on casting machine, obtain substrate green sheet band after drying, wherein, described drying carries out in enclosed environment, drying temperature is 22 ~ 28 DEG C, and relative humidity is 50 ~ 70%;
(2) cut: the substrate green sheet band that step (1) is obtained is cut to desired shape, then stores.
Further, described casting machine is six warm area steel band casting machines, and the temperature of six warm areas is respectively 30 ~ 40 DEG C, 40 ~ 50 DEG C, 50 ~ 60 DEG C, 60 ~ 70 DEG C, 80 ~ 90 DEG C, 100 ~ 110 DEG C.
In step (1) flow casting molding, NFC Magnetic Substrate slurry of the present invention is carried out curtain coating on casting machine, the thickness of curtain coating green sheet is controlled, described in formula specific as follows by the degree of depth controlling slurry in the viscosity of slurry, curtain coating speed, scraper length and storage vat:
The thickness expression formula of substrate green sheet band is:
In formula, H is casting films thickness, and α is shrinkage coefficient, and h is scraper height, and Δ P is hopper base pressure, and n is slurry viscosity, and v is curtain coating speed, and L is scraper length.
The present invention has the following advantages:
In the present invention's formula, polyacrylic acid is dispersion agent, polyvinyl alcohol is binding agent, polyoxyethylene glycol is fluidizer, solvent is water, defoamer is polyether antifoam agent, preparation method adopts aqueous tape casting forming technique, and optimize casting molding processes parameter, especially control well old process time viscosity, the curtain coating speed of casting machine, the temperature in each district, the degree of depth of slurry in scraper length and storage vat, dry temperature and humidity controls thickness and the quality of curtain coating green sheet, the present invention solves prior art by the optimization of formula system and processing parameter, and to there is the wettability of the shaping middle water of aqueous tape casting to powder poor, volatilization is slow and time of drying is long, slurry deaeration difficulty, casting films snappiness is poor, easy to crack, the defects such as intensity is low, make the thickness of flow casting molding green sheet out directly can reach 0.06 ~ 1mm, decrease corresponding pressing working procedure, and then improve production efficiency, reduce production cost.Therefore, NFC Magnetic Substrate slurry solvent water of the present invention is good to the wettability of powder, have that volatilization is fast, time of drying is short, slurry remove bubble easily, casting films snappiness better, the advantage that not easy to crack, intensity is high; The preparation method of slurry has easy to prepare, safety, environmental protection, the feature that efficient, cost is low; The Magnetic Substrate even structure adopting this slurry to prepare, intensity is high, snappiness good.
Embodiment
Below in conjunction with embodiment, the present invention will be further described, and protection scope of the present invention is not limited to the following stated.
Embodiment 1: a kind of NFC Magnetic Substrate, is prepared from by following methods:
S1. get the raw materials ready: take each raw material in following ratio, for subsequent use; Nanoscale ferrite powder (grain diameter is 300 ~ 500nm): 40kg; Polyacrylic acid: 0.1kg; Polyvinyl alcohol: 0.5kg; Polyoxyethylene glycol: 0.3kg; Polyether antifoam agent: 0.3kg; Water: 8kg;
S2. casting slurry is prepared: nanoscale ferrite powder load weighted in step S1, polyacrylic acid, polyvinyl alcohol, polyoxyethylene glycol, water are mixed rear ball milling 20h, and rotational speed of ball-mill is 300r/min, obtains casting slurry;
S3. deaeration is old: the casting slurry prepared by step S2 crosses 100 mesh sieves, under the subnormal ambient of 0.1MPa, vacuum defoamation 8h is carried out after adding polyether antifoam agent, and carry out old process by 1h/L, control viscosity at 10000cps, obtained NFC Magnetic Substrate aqueous casting slurry;
S4. flow casting molding: NFC Magnetic Substrate aqueous casting slurry is carried out curtain coating on six warm area steel band casting machines, the substrate green sheet band that thickness is 0.08mm is obtained after drying, wherein, the temperature of described casting machine six warm areas is respectively 30 DEG C, 40 DEG C, 50 DEG C, 60 DEG C, 80 DEG C, 100 DEG C, hopper base pressure is 0.02MPa, and curtain coating speed is 1m/min, and scraper height is 0.17mm, scraper length 400mm, ɑ shrinkage coefficient is 1; Described drying carries out in enclosed environment, and drying temperature is 22 DEG C, and relative humidity is 50%;
S5. cut: the substrate green sheet band that step S4 is obtained is cut into 0.08mm × 60mm × 70mm size, then stores.
Embodiment 2: a kind of NFC Magnetic Substrate, is prepared from by following methods:
S1. get the raw materials ready: take each raw material in following ratio, for subsequent use; Nanoscale ferrite powder (grain diameter is 300 ~ 500nm): 81kg; Polyacrylic acid: 0.5kg; Polyvinyl alcohol: 1.5kg; Polyoxyethylene glycol: 1.0kg; Polyether antifoam agent: 1.0kg; Water: 15kg;
S2. casting slurry is prepared: nanoscale ferrite powder load weighted in step S1, polyacrylic acid, polyvinyl alcohol, polyoxyethylene glycol, water are mixed rear ball milling 30h, and rotational speed of ball-mill is 500r/min, obtains casting slurry;
S3. deaeration is old: the casting slurry prepared by step S2 crosses 200 mesh sieves, under the subnormal ambient of 0.3MPa, vacuum defoamation 15h is carried out after adding polyether antifoam agent, and carry out old process by 2h/L, control viscosity at 15000cps, obtained NFC Magnetic Substrate aqueous casting slurry;
S4. flow casting molding: NFC Magnetic Substrate aqueous casting slurry is carried out curtain coating on six warm area steel band casting machines, the green sheet band that substrate thickness is 0.15mm is obtained after drying, wherein, the temperature of described casting machine six warm areas is respectively 40 DEG C, 50 DEG C, 60 DEG C, 70 DEG C, 90 DEG C, 110 DEG C, and described drying carries out in enclosed environment, and hopper base pressure is 0.02MPa, curtain coating speed is 1m/min, scraper height is 0.31mm, and scraper length 400mm, ɑ shrinkage coefficient is 1; Drying temperature is 28 DEG C, and relative humidity is 70%;
S5. cut: the substrate green sheet band that step S4 is obtained is cut into 0.15mm × 60mm × 70mm size, then stores.
Embodiment 3: a kind of NFC Magnetic Substrate, is prepared from by following methods:
S1. get the raw materials ready: take each raw material in following ratio, for subsequent use; Nanoscale ferrite powder (grain diameter is 300 ~ 500nm): 55kg; Polyacrylic acid: 0.2kg; Polyvinyl alcohol: 1kg; Polyoxyethylene glycol: 0.5kg; Polyether antifoam agent: 0.5kg; Water: 10kg;
S2. casting slurry is prepared: nanoscale ferrite powder load weighted in step S1, polyacrylic acid, polyvinyl alcohol, polyoxyethylene glycol, water are mixed rear ball milling 24h, and rotational speed of ball-mill is 365r/min, obtains casting slurry;
S3. deaeration is old: the casting slurry prepared by step S2 crosses 130 mesh sieves, under the subnormal ambient of 0.2MPa, vacuum defoamation 10h is carried out after adding polyether antifoam agent, and carry out old process by 1.4h/L, control viscosity at 12000cps, obtained NFC Magnetic Substrate aqueous casting slurry;
S4. flow casting molding: NFC Magnetic Substrate aqueous casting slurry is carried out curtain coating on six warm area steel band casting machines, the green sheet band that substrate thickness is 0.08mm is obtained after drying, wherein, the temperature of described casting machine six warm areas is respectively 32 DEG C, 45 DEG C, 54 DEG C, 63 DEG C, 87 DEG C, 104 DEG C, hopper base pressure is 0.02MPa, and curtain coating speed is 0.08m/min, and scraper height is 0.4mm, scraper length 400mm, ɑ shrinkage coefficient is 1; Described drying carries out in enclosed environment, and drying temperature is 24 DEG C, and relative humidity is 60%;
S5. cut: the substrate green sheet band that step S4 is obtained is cut into 0.08mm × 60mm × 70mm size, then stores.
Embodiment 4: a kind of NFC Magnetic Substrate, is prepared from by following methods:
S1. get the raw materials ready: take each raw material in following ratio, for subsequent use; Nanoscale ferrite powder (grain diameter is 300 ~ 500nm): 68kg; Polyacrylic acid: 0.4kg; Polyvinyl alcohol: 0.8kg; Polyoxyethylene glycol: 0.8kg; Polyether antifoam agent: 0.7kg; Water: 13kg;
S2. casting slurry is prepared: nanoscale ferrite powder load weighted in step S1, polyacrylic acid, polyvinyl alcohol, polyoxyethylene glycol, water are mixed rear ball milling 28h, and rotational speed of ball-mill is 428r/min, obtains casting slurry;
S3. deaeration is old: the casting slurry prepared by step S2 crosses 160 mesh sieves, under the subnormal ambient of 0.2MPa, vacuum defoamation 13h is carried out after adding polyether antifoam agent, and carry out old process by 1.8h/L, control viscosity at 14000cps, obtained NFC Magnetic Substrate aqueous casting slurry;
S4. flow casting molding: NFC Magnetic Substrate aqueous casting slurry is carried out curtain coating on six warm area steel band casting machines, the substrate green sheet band that thickness is 0.15mm is obtained after drying, wherein, the temperature of described casting machine six warm areas is respectively 35 DEG C, 48 DEG C, 55 DEG C, 65 DEG C, 85 DEG C, 105 DEG C, hopper base pressure is 0.02MPa, and curtain coating speed is 0.08m/min, and scraper height is 0.5mm, scraper length 400mm, ɑ shrinkage coefficient is 1; Described drying carries out in enclosed environment, and drying temperature is 26 DEG C, and relative humidity is 65%;
S5. cut: the substrate green sheet band that step S4 is obtained is cut into 0.15mm × 60mm × 70mm size, then stores.
Below by way of description of test beneficial effect of the present invention:
Performance test: NFC Magnetic Substrate prepared by embodiment 1-4 is sintered, key performance index are tested, three kinds of NFC Magnetic Substrates (adopting non-aqueous tape-casting technique) that the model of producing with Japanese TDK company is IBF10, IBF15, IBF20 are contrast, and test result is as shown in table 1:
Table 1:NFC Magnetic Substrate the performance test results
As shown in Table 1: adopt the NFC Magnetic Substrate that water-based flow casting technique is prepared, Key Performance Indicator in embodiment is close to the level even exceeding TDK tri-sections of products in reference examples, and compare non-aqueous tape-casting technique, achieving safety truly, environmental protection, efficient, low cost production, constructing NFC Magnetic Substrate at home first from developing to the integral framework of producing.
Claims (1)
1. a NFC Magnetic Substrate, is characterized in that, described NFC Magnetic Substrate is prepared from by following methods:
(1) flow casting molding: NFC Magnetic Substrate aqueous casting slurry is carried out curtain coating on casting machine, obtains substrate green sheet band after drying, wherein, described drying carries out in enclosed environment, and drying temperature is 22 ~ 28 DEG C, and relative humidity is 50 ~ 70%; Described casting machine is six warm area steel band casting machines, and the temperature of six warm areas is respectively 30 ~ 40 DEG C, 40 ~ 50 DEG C, 50 ~ 60 DEG C, 60 ~ 70 DEG C, 80 ~ 90 DEG C, 100 ~ 110 DEG C;
Described NFC Magnetic Substrate aqueous casting slurry, it is made up of the raw material of following weight parts:
Nanoscale ferrite powder: 40 ~ 81; Polyacrylic acid: 0.1 ~ 0.5;
Polyvinyl alcohol: 0.5 ~ 1.5; Polyoxyethylene glycol: 0.3 ~ 1.0;
Polyether antifoam agent: 0.3 ~ 1.0; Water: 8 ~ 15;
The grain diameter of described nanoscale ferrite powder is 300 ~ 500nm;
The preparation method of NFC Magnetic Substrate aqueous casting slurry, it comprises the following steps:
S1. get the raw materials ready: take each raw material according to the above ratio, for subsequent use;
S2. casting slurry is prepared: nanoscale ferrite powder load weighted in step S1, polyacrylic acid, polyvinyl alcohol, polyoxyethylene glycol, water are mixed rear ball milling 20 ~ 30h, and rotational speed of ball-mill is 300 ~ 500r/min, obtains casting slurry;
S3. deaeration is old: the casting slurry prepared by step S2 crosses 100 ~ 200 mesh sieves, under the subnormal ambient of 0.1 ~ 0.3MPa, vacuum defoamation 8 ~ 15h is carried out after adding polyether antifoam agent, and carry out old process by 1 ~ 2h/L, control viscosity at 10000 ~ 15000cps, obtained NFC Magnetic Substrate aqueous casting slurry;
(2) cut: the substrate green sheet band that step (1) is obtained is cut to desired shape, then stores.
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| CN105682438B (en) * | 2016-02-19 | 2018-08-17 | 深圳鹏汇功能材料有限公司 | High magnetic permeability inhales wave plate and its casting slurry and preparation method |
| CN108947515A (en) * | 2018-08-28 | 2018-12-07 | 江苏科技大学 | A kind of texturing Mn ferrite ceramics and preparation method |
| CN109020530A (en) * | 2018-08-28 | 2018-12-18 | 江苏科技大学 | A kind of texturing cu ferrite ceramics and preparation method |
| CN112672626A (en) * | 2020-12-18 | 2021-04-16 | 成都佳驰电子科技有限公司 | Multi-band magnetic wave-absorbing film and preparation method thereof |
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| CN102757217A (en) * | 2011-04-29 | 2012-10-31 | 深圳振华富电子有限公司 | Water-base tape casting slurry and water-base tape casting wet method for preparing multilayer chip component |
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