CN107464648A - A kind of rubber magnet and preparation method thereof - Google Patents
A kind of rubber magnet and preparation method thereof Download PDFInfo
- Publication number
- CN107464648A CN107464648A CN201710744712.8A CN201710744712A CN107464648A CN 107464648 A CN107464648 A CN 107464648A CN 201710744712 A CN201710744712 A CN 201710744712A CN 107464648 A CN107464648 A CN 107464648A
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- China
- Prior art keywords
- rubber
- magnetic
- parts
- couplingization
- rubber magnet
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
Abstract
The invention discloses a kind of rubber magnet and preparation method thereof, it is made up of couplingization magnetic, rubber composition and thermostabilization auxiliary agent, wherein the couplingization magnetic parts by weight are 85 ~ 90 parts, described rubber weight part is 6 ~ 16 parts, the thermostabilization auxiliary agent parts by weight are 0.2 ~ 1 part, and step is as follows：Powder, magnet preparation, finished product, magnetic sheet magnetic property and the test of magnetic stripe dimensional accuracy are filled out in the processing of magnetic couplingization, banburying.The present invention uses halogen-free material, meets the Halogen instruction of International Electrotechnical Commission；Preparation technology is simple, is not required to vulcanize, similar with existing CPE bases rubber magnet preparation technology, and feed back is repeatable to be utilized, therefore reduces preparation cost；Solve the problems such as not heatproof, bulk yielding, precision be low, application can be greatly expanded.
Description
Technical field
The present invention relates to binding electromagnetic material field, more particularly to a kind of rubber magnet and preparation method thereof.
Background technology
Bonded permanent magnet is that magnetic uniformly mixes with binding agents such as rubber, resin or low-melting-point metals, then with molding, pressure
The manufactured polymer matrix composite permanent-magnetic material of the methods of prolonging, extrude or being injection moulded, it is an important branch in permanent-magnet material.
Binder material used mainly has 2 classes：Polymer (such as rubber, thermoplasticity or thermosetting resin) and low-melting-point metal (such as Zn,
Sn, Cu, AI and its alloy etc.).Later stage the 1960s is started from the method for bonding process production magnet, with initial casting
Following characteristics have been compared with the magnet of powder metallurgic method (also known as sintering process) production：
1. designability is strong, it can be needed to carry out magnetic property according to application and shape designs；
2. size and precision are high, freedom shape is big, can a precise forming complicated shape magnet；
3. magnet performance is uniformly, unanimously；
4. good mechanical property, there is very high toughness, not easy to crack and quick-fried angle etc.；
5. mass automatic production, high financial profit can be realized.
Exactly these advantages cause bonded permanent magnet to be widely used in computer, electronics industry, auto industry, office automatically
The fields such as change, household electrical appliance, turn into the basic material and magnetic stripe of new high-tech industry.
Wherein rubber magnet is a widely used branch in bonded permanent magnet, and it is mainly helped using rubber, magnetic, processing
Agent etc. has can use and scratches 180 °, is not required to by being kneaded (mill or banburying), crushing, shaping (rolling process or extrusion molding) to be made
Sintering, the property such as tensile strength is big, bending modulus is big, are able to widely use in fields such as micro machine magnetic stripe, sensors.
In general, the forming method of rubber magnet has two classes：Rolling-molding method and extrusion moulding.Rolling-molding method is
Above-mentioned rubber, magnetic, processing aid etc. are filled in the double roller gap of incorgruous steering by the mixture after being kneaded, crushing,
By constantly rolling, mediating so that magnetic and rubber etc., which stick together, is made magnetic sheet.This method is the simplest, and magnetic sheet is made
Required size can be arbitrarily cut into, is widely used in the fields such as refrigerator door seal magnetic stripe, micro-machine.Extrusion moulding is
Above-mentioned rubber, magnetic, processing aid for feeding in extrusion shaping machine etc. are heated into fusing by the mixture after being kneaded, crushing,
The mixture is extruded from the metal die of extrusion shaping machine, cooled and solidified simultaneously, by the formed body of resulting long size
The method for cut into required length, magnet being made.This method by selecting metal die, to a certain extent can be free
Set magnet shape, can easily manufacture thin-walled, the magnet of long size, meanwhile, for fused mass mobility requirement not
It is high as injection moulding.
Comparatively speaking, rubber magnet magnetic property made from rolling-molding method is high, therefore main in the specific embodiment of the invention
To use rolling-molding method.But extrusion molding has specific advantages in complicated shape, continuous production etc..
The thermoplasticity that vinyl-acrylate copolymer is ethene and acrylate (methyl esters, ethyl ester, butyl ester etc.) copolymerization forms
Plastics or elastomer.Ethylene-methyl acrylate copolymer abbreviation EMA, methyl acrylate content 8%~40%.Ethylene-acrylic acid
Methacrylate copolymers abbreviation EEA, ethyl acrylate content 10%~30%.With good pliability, heat endurance and processability.
Environmental stress crack resistance, impact resistance, bending fatigue resistance, low temperature properties are superior to low density polyethylene (LDPE).Have with polyolefin
Compatibility, and can be mixed with mass filler and non-brittle.Purposes have can make binder between PUR, composite film, sealing ring,
Packing film, extrusion coated articles, flexible pipe, sheet material section bar, electric wire, modifier, toy, container etc..Wherein, second
Alkene-ethyl acrylate (EEA) resin is the family of toughness and flexibility maximum in polyolefin.Their scope is included from class rubber
, the low melting point product of hotmelt is suitable as, arrives quasi-polyethylene, the product with unusual toughness and flexibility.
Above-mentioned rubber magnet is a kind of polymer matrix composite, the rubber-based containing 30~40% volume fractions, is mainly included
Two classes：One kind is CM- magnetic systems, mainly with CM (chlorinated polyethylene rubber), magnetic (permanent-magnet ferrite or Agglutinate neodymium-iron-boron),
Auxiliary agent (plasticizer, lubricant, coupling agent, antiaging agent) is made by rubber magnet technique, and such rubber magnet processing is simply, no
Need vulcanization, cheap, but it has that (chlorinity reaches 7000ppm, the environmental requirement far above 900ppm, does not meet containing halogen
The harsh environmental protection standard of American-European countries), below 80 DEG C of temperature in use, more than 80 DEG C mutabilities, the problems such as dimensional accuracy is not high,；
Another kind of is NBR- magnetic systems, mainly with NBR (nitrile rubber), magnetic (permanent-magnet ferrite or Agglutinate neodymium-iron-boron), vulcanizing agent,
Auxiliary agent (plasticizer, lubricant, coupling agent, antiaging agent) is made by rubber magnet technique, the processing of such rubber magnet is more complicated,
Need to vulcanize, vulcanize after dimensional accuracy is high, price is suitable, but such rubber magnet needs to vulcanize, and has that rubber cost is high, technique is multiple
The inferior positions such as uniformity is low, feed back utilization rate is low after miscellaneous, vulcanization.
The content of the invention
The present invention is to overcome above shortcomings in the prior art, there is provided a kind of rubber magnet and its preparation side
Method, preparation are not required to vulcanization, halogen-free environmental, the rubber magnet of high dimensional accuracy.
To achieve these goals, the present invention uses following technical scheme：
A kind of rubber magnet, it is made up of couplingization magnetic, rubber composition and thermostabilization auxiliary agent, wherein the couplingization magnetic weight
It is 85~90 parts to measure part, and described rubber weight part is 6~16 parts, and the thermostabilization auxiliary agent parts by weight are 0.2~1 part.
Preferably, the couplingization magnetic is mixed by 100 parts of magnetics and 0.5~1.2 part of titanate coupling agent
It is even, 6~12h is dried after taking-up and is obtained.
Preferably, the magnetic is Sr ferromagnetic oxide powders or Ba ferromagnetic oxide powders.
Preferably, the rubber composition includes plasticizer and stearic acid, add 100 parts according to rubber in rubber composition
If calculating, added plasticizer loading is 5~15 parts, and added stearic acid content is 0~5 part.
Preferably, the plasticizer is one kind in fatty acid ester, epoxy ester series, polyesters and trimellitic acid esters
It is or a variety of.In specific kind, epoxidized soybean oil (ESO), epoxy fat that selection matches with ethylene-ethylacrylate (EEA)
Fat acid butyl ester (EBST) etc..
Preferably, in the rubber composition, rubber is ethylene-ethylacrylate (EEA).
Preferably, the thermostabilization auxiliary agent is the mixture that metallic soap and carbon black are formed with any ratio.
Preferably, the metallic soap includes calcium stearate, zinc stearate, magnesium stearate, moon calcium silicates and Magnesium dilaurate
One or more therein.
Preferably, a kind of a kind of preparation method of rubber magnet according to claim 1,3,5 or 8, its feature
It is to comprise the steps：
(1) magnetic couplingization is handled：By magnetic, titanate coupling agent by a certain percentage, stir, take in high-speed mixer
6~12h is dried after going out；
(2) powder is filled out in banburying：Couplingization magnetic is mixed with above-mentioned rubber, plasticizer, stearic acid, thermostabilization auxiliary agent, then close
15~30min is kneaded in mill, mixing temperature is controlled at 90 DEG C~110 DEG C, and particulate material is ground into after the completion of banburying；
(3) prepared by magnet：Required rubber magnetic sheet is prepared into by the calendering of calender slice, temperature control is 60 DEG C~90
℃；Or the rubber magnet by single screw extrusion machine extrusion molding；
(4) finished product：Cut into product and pack.
Therefore, the present invention has the advantages that：(1) halogen-free material is used, meets the Halogen of International Electrotechnical Commission
Instruction：Cl concn is less than 900ppm, and bromine concentration is less than 900ppm, and chlorine+bromine concentration is less than 1500ppm；(2) preparation technology is simple,
It is not required to vulcanize, similar with existing CPE bases rubber magnet preparation technology, feed back is repeatable to be utilized, therefore reduces preparation cost；
(3) problems such as not heatproof, bulk yielding, precision be low are solved, application can be greatly expanded.
Embodiment
With reference to embodiment, the present invention will be further described.Wherein, ethylene-ethylacrylate (EEA),
The specific trade mark has 2112AC, 2116AC, 2615AC, 2618AC, 2715AC, 2716AC and 2812AC, selects the wherein single trade mark
Or several trade mark mixed rubbers；ESO：Epoxidized soybean oil, general purpose grade；N220、N326：Carbon black, precious prosperous chemical industry are produced；N220S：
Japanese JSR synthetic rubber Co., Ltd. produces.
Embodiment 1
A kind of composition, specific couplingization magnetic kind and content, compounding rubber thing content, thermostabilization auxiliary agent content are shown in Table 1 institute
State；It is as follows that calendering formation prepares rubber magnet method and step：
A. magnetic couplingization is handled.Special ferromagnetic oxide powder 150kg, titanate coupling agent 1L will be pacified, stirred in high-speed mixer
Uniformly, 6h is dried after taking-up；
B. powder is filled out in banburying.By couplingization magnetic and EEA 15kg, ESO (epoxidized soybean oil) 0.6L, the stearic acid of the 2715AC trades mark
0.2L is mixed, and zinc stearate 0.3kg, N220 trade mark carbon black 0.2kg is added after 5min, 20min is then kneaded in banbury, close
Temperature control is refined at 100 DEG C, is crushed after banburying, slice；
C. prepared by magnet.Required rubber magnet, temperature normal temperature are prepared into by calender；
The product of certain size is cut into, is packed.Magnetism testing magnetic sheet size is 55*55*3.5mm, and electric machine magnetic strip is cut into
67.6±0.13*2.8±0.05*1.3±0.03mm；Magnetic sheet magnetic property and the test of magnetic stripe dimensional accuracy, chlorine, the bromine composition of magnetic stripe
Analysis.
Magnetic property, halogenic ingredient analysis result are as shown in table 2, and magnetic stripe dimensional accuracy analysis result is as shown in table 3.
Embodiment 2
As different from Example 1, rubber composition, the concrete composition of thermostabilization auxiliary agent are changed, is specifically shown in Table 1.
Magnetic property, halogenic ingredient analysis result are as shown in table 2, and magnetic stripe dimensional accuracy analysis result is as shown in table 3.
Embodiment 3
As different from Example 1, rubber composition, the concrete composition of thermostabilization auxiliary agent are changed, is specifically shown in Table 1.
Magnetic property, halogenic ingredient analysis result are as shown in table 2, and magnetic stripe dimensional accuracy analysis result is as shown in table 3.
Comparative example 1
As different from Example 1, thermostabilization auxiliary agent (metallic soap, carbon black) is not added with, is specifically shown in Table 1.
Magnetic property, halogenic ingredient analysis result are as shown in table 2, and magnetic stripe dimensional accuracy analysis result is as shown in table 3.
It can be seen that：Zinc stearate+carbon black this thermostabilization auxiliary agent, the increase of magnetic Phase Proportion are not added with, magnet magnetic property has
Increased；But in terms of magnetic stripe dimensional accuracy, former Cutting Length 67.60mm, by 80 DEG C, 24h environmental testings, size increases to
67.75mm, set upper limit value is alreadyd exceed, by 100 DEG C, 24h environmental testings, size increases to 67.83mm, is unable to reach client
It is required that；It is as the same in terms of width, thickness.
Comparative example 2
As different from Example 1, the 0.2-1% that thermostabilization auxiliary agent (metallic soap, carbon black) content exceedes application claims is added
Scope, be specifically shown in Table 1.
Magnetic property, halogenic ingredient analysis result are as shown in table 2, and magnetic stripe dimensional accuracy analysis result is as shown in table 3.
It can be seen that：Although the group of formula magnetic stripe dimensional accuracy is fine, zinc stearate+carbon black thermostabilization auxiliary agent mistake is added
Show as filling out powder difficulty, screw torque increase after amount, in process, magnet magnetic property significantly declines, and does not reach motor
It can require.
Comparative example 3
As different from Example 2, NBR rubber (metallic soap, carbon black) is employed, is specifically shown in Table 1.
Magnetic property, halogenic ingredient analysis result are as shown in table 2, and magnetic stripe dimensional accuracy analysis result is as shown in table 3.
It can be seen that：Using NBR rubber as binding agent, although can be up to standard in terms of magnet magnetic property, content of halogen,
But in terms of magnetic stripe dimensional accuracy, if being not required to sulfuration process using conventional, as test temperature raises, dimension overproof
Amount is very big, is unable to reach customer requirement.
The embodiment of table 1 and comparative example component
Test case
The magnet magnetic property of table 2, halogenic ingredient analysis
The magnetic stripe dimensional accuracy of table 3 is tested
Claims (9)
1. a kind of rubber magnet, it is characterized in that, it is made up of couplingization magnetic, rubber composition and thermostabilization auxiliary agent, wherein described
Couplingization magnetic parts by weight are 85 ~ 90 parts, and described rubber weight part is 6 ~ 16 parts, and the thermostabilization auxiliary agent parts by weight are 0.2 ~ 1
Part.
2. a kind of rubber magnet according to claim 1, it is characterized in that, the couplingization magnetic is by 100 parts of magnetics and 0.5
~ 1.2 parts of titanate coupling agents are mixed evenly, and 6 ~ 12h is dried after taking-up and is obtained.
3. a kind of rubber magnet according to claim 2, it is characterized in that, the magnetic is Sr ferromagnetic oxide powders or Ba iron oxygen
Body magnetic.
4. a kind of rubber magnet according to claim 1, it is characterized in that, the rubber composition includes plasticizer and tristearin
Acid, in rubber composition according to rubber add 100 parts calculate if, added plasticizer loading is 5 ~ 15 parts, added stearic acid content
For 0 ~ 5 part.
5. a kind of rubber magnet according to claim 4, it is characterized in that, the plasticizer is fatty acid ester, epoxy-ester
One or more in class, polyesters and trimellitic acid esters.
6. a kind of rubber magnet according to claim 1 or 5, it is characterized in that, in the rubber composition, rubber is second
Alkene-ethyl acrylate（EEA）.
7. a kind of rubber magnet according to claim 1, it is characterized in that, the thermostabilization auxiliary agent be metallic soap and carbon black with
Any mixture than composition.
8. a kind of rubber magnet according to claim 7, it is characterized in that, the metallic soap includes calcium stearate, stearic acid
Zinc, magnesium stearate, moon calcium silicates and Magnesium dilaurate one or more therein.
9. a kind of a kind of preparation method of rubber magnet according to claim 1,3,5 or 8, it is characterized in that, including it is following
Step：
（1）The processing of magnetic couplingization：By magnetic, titanate coupling agent by a certain percentage, stir, take in high-speed mixer
6 ~ 12h is dried after going out；
（2）Powder is filled out in banburying：Couplingization magnetic is mixed with above-mentioned rubber, plasticizer, stearic acid, thermostabilization auxiliary agent, then close
15 ~ 30min is kneaded in mill, mixing temperature is controlled at 90 DEG C ~ 110 DEG C, and particulate material is ground into after the completion of banburying；
（3）It is prepared by magnet：Required rubber magnetic sheet is prepared into by the calendering of calender slice, temperature control is at 60 DEG C ~ 90 DEG C；
Or the rubber magnet by single screw extrusion machine extrusion molding；
（4）Finished product：Cut into product and pack.
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| CN201710744712.8A CN107464648A (en) | 2017-08-25 | 2017-08-25 | A kind of rubber magnet and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710744712.8A CN107464648A (en) | 2017-08-25 | 2017-08-25 | A kind of rubber magnet and preparation method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01212703A (en) * | 1988-02-18 | 1989-08-25 | Seiko Epson Corp | Manufacture of magnetic material |
| CN101866734A (en) * | 2009-04-20 | 2010-10-20 | 广东江粉磁材股份有限公司 | Polyvinyl plastic bonding type magnetic material and manufacturing method thereof |
| CN102832005A (en) * | 2012-09-13 | 2012-12-19 | 北矿磁材科技股份有限公司 | Environment-friendly halogen-free ferrite composite magnetic material |
| CN103578683A (en) * | 2013-09-29 | 2014-02-12 | 浙江省东阳市诚基电机有限公司 | Rubber magnetic strip used under low temperature and preparation method thereof |
| CN104505204A (en) * | 2014-10-24 | 2015-04-08 | 横店集团东磁股份有限公司 | Rubber magnet composite and preparation method thereof |
| CN105788798A (en) * | 2016-03-29 | 2016-07-20 | 中山市玛而特电子科技有限公司 | Injection-molded ferrite soft magnetic material and preparation method thereof |
-
2017
- 2017-08-25 CN CN201710744712.8A patent/CN107464648A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01212703A (en) * | 1988-02-18 | 1989-08-25 | Seiko Epson Corp | Manufacture of magnetic material |
| CN101866734A (en) * | 2009-04-20 | 2010-10-20 | 广东江粉磁材股份有限公司 | Polyvinyl plastic bonding type magnetic material and manufacturing method thereof |
| CN102832005A (en) * | 2012-09-13 | 2012-12-19 | 北矿磁材科技股份有限公司 | Environment-friendly halogen-free ferrite composite magnetic material |
| CN103578683A (en) * | 2013-09-29 | 2014-02-12 | 浙江省东阳市诚基电机有限公司 | Rubber magnetic strip used under low temperature and preparation method thereof |
| CN104505204A (en) * | 2014-10-24 | 2015-04-08 | 横店集团东磁股份有限公司 | Rubber magnet composite and preparation method thereof |
| CN105788798A (en) * | 2016-03-29 | 2016-07-20 | 中山市玛而特电子科技有限公司 | Injection-molded ferrite soft magnetic material and preparation method thereof |
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Application publication date: 20171212 |