CN216919083U - Coating, neodymium iron boron magnet containing coating, rotor and motor - Google Patents
Coating, neodymium iron boron magnet containing coating, rotor and motor Download PDFInfo
- Publication number
- CN216919083U CN216919083U CN202122078918.6U CN202122078918U CN216919083U CN 216919083 U CN216919083 U CN 216919083U CN 202122078918 U CN202122078918 U CN 202122078918U CN 216919083 U CN216919083 U CN 216919083U
- Authority
- CN
- China
- Prior art keywords
- coating
- magnet
- thickness
- equal
- less
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 244
- 239000011248 coating agent Substances 0.000 title claims abstract description 235
- 229910001172 neodymium magnet Inorganic materials 0.000 title claims abstract description 51
- 239000011247 coating layer Substances 0.000 claims abstract description 69
- 238000005260 corrosion Methods 0.000 claims abstract description 19
- 230000007797 corrosion Effects 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims description 35
- 239000006260 foam Substances 0.000 claims description 34
- 229920000103 Expandable microsphere Polymers 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 17
- 239000010410 layer Substances 0.000 claims description 13
- 238000007747 plating Methods 0.000 claims description 11
- 239000004005 microsphere Substances 0.000 claims description 9
- 230000001413 cellular effect Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 8
- 239000010959 steel Substances 0.000 abstract description 8
- 239000011148 porous material Substances 0.000 abstract description 2
- 239000008199 coating composition Substances 0.000 description 33
- 238000000034 method Methods 0.000 description 17
- 229920005989 resin Polymers 0.000 description 15
- 239000011347 resin Substances 0.000 description 15
- 239000000843 powder Substances 0.000 description 14
- 238000001035 drying Methods 0.000 description 13
- 239000003822 epoxy resin Substances 0.000 description 13
- 229920000647 polyepoxide Polymers 0.000 description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 239000003795 chemical substances by application Substances 0.000 description 10
- 239000000758 substrate Substances 0.000 description 10
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 9
- 239000004088 foaming agent Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 9
- 239000002904 solvent Substances 0.000 description 9
- 238000005406 washing Methods 0.000 description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 238000005238 degreasing Methods 0.000 description 8
- 238000001962 electrophoresis Methods 0.000 description 8
- 239000003973 paint Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000004913 activation Effects 0.000 description 6
- 239000000654 additive Substances 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 6
- 238000007654 immersion Methods 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000004925 Acrylic resin Substances 0.000 description 5
- 229920000178 Acrylic resin Polymers 0.000 description 5
- 230000003213 activating effect Effects 0.000 description 5
- 238000005187 foaming Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000002203 pretreatment Methods 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- 239000004593 Epoxy Substances 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- -1 polysiloxanes Polymers 0.000 description 4
- 229920005749 polyurethane resin Polymers 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 4
- 239000000080 wetting agent Substances 0.000 description 4
- RWNUSVWFHDHRCJ-UHFFFAOYSA-N 1-butoxypropan-2-ol Chemical compound CCCCOCC(C)O RWNUSVWFHDHRCJ-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 239000006087 Silane Coupling Agent Substances 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 3
- 239000000440 bentonite Substances 0.000 description 3
- 229910000278 bentonite Inorganic materials 0.000 description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 229920006334 epoxy coating Polymers 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 3
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 2
- LXBGSDVWAMZHDD-UHFFFAOYSA-N 2-methyl-1h-imidazole Chemical compound CC1=NC=CN1 LXBGSDVWAMZHDD-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000009920 chelation Effects 0.000 description 2
- 239000007822 coupling agent Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 238000003618 dip coating Methods 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000004070 electrodeposition Methods 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 238000009503 electrostatic coating Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012943 hotmelt Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012784 inorganic fiber Substances 0.000 description 2
- 235000019359 magnesium stearate Nutrition 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000002444 silanisation Methods 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000007751 thermal spraying Methods 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 238000004017 vitrification Methods 0.000 description 2
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 description 1
- FEWFXBUNENSNBQ-UHFFFAOYSA-N 2-hydroxyacrylic acid Chemical compound OC(=C)C(O)=O FEWFXBUNENSNBQ-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004801 Chlorinated PVC Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 229920000388 Polyphosphate Polymers 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229920000457 chlorinated polyvinyl chloride Polymers 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 239000001205 polyphosphate Substances 0.000 description 1
- 235000011176 polyphosphates Nutrition 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011527 polyurethane coating Substances 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Landscapes
- Hard Magnetic Materials (AREA)
Abstract
The utility model relates to a coating, a neodymium iron boron magnet containing the coating, a rotor and a motor. The coating comprises a first coating and a second coating, the first coating being interposed between the magnet and the second coating; the thickness of the first coating is greater than or equal to 0 μm and less than or equal to 20 μm, and the thickness of the second coating is greater than or equal to 20 μm and less than or equal to 300 μm. Preferably, the thickness of the second coating layer is 50 μm or more and 300 μm or less. The coating and the neodymium iron boron magnet containing the coating not only improve the disadvantage of low corrosion resistance due to large pores, but also improve the corrosion resistance and the insulativity of the whole magnet, have good thickness consistency and have binding force with the magnet and a magnetic steel groove.
Description
Technical Field
The utility model relates to the field of magnet surface protection treatment, in particular to a coating and a magnet containing the coating, and especially relates to a neodymium iron boron magnet.
Background
The neodymium iron boron magnet is widely applied to the fields of automobile motors, wind power generation, elevators, tractors and the like due to excellent magnetic performance. For permanent magnet motors operating at high speeds, rotor magnet loss has become a critical factor affecting their reliable operation. In order to reduce the eddy current loss of the magnetic steel, an interior permanent magnet motor (IPM) generally assembles one or more single sheets of permanent magnet neodymium iron boron magnetic steel together, coats an insulating coating, and then encapsulates the single sheets in a magnetic steel groove, so as to reduce the eddy current loss of the magnetic steel. In the process, the potting resin is always the key point of motor design improvement, and the fluidity, the bonding strength, the insulativity, the thermal conductivity, the oil resistance and the environmental protection property of the resin are all factors to be considered by a designer.
Although the conventional assembly method has achieved good assembly effect, different problems still exist, such as glue pouring resin, only resin coatings are arranged on the surface of the magnet, and chipping can occur in extremely cold environments to damage epoxy resin coatings. When the epoxy resin coating on the surface of the magnet is in close contact with the magnetic steel groove, the epoxy resin coating is abraded or cracked, the surface of the magnet can be corroded, the magnet is damaged prematurely, and the preparation and use processes of the epoxy resin are not environment-friendly, the process preparation is complex, the period is long, and the like. In the assembly process of the adhesive glue, the adhesive sheet and the like, if mud, sand and gravel are mixed, the damage of the epoxy resin coating is accelerated.
The expanded coating is widely applied to the fields of building fireproof coatings, printing ink printing, packaging protective coatings and the like, and the function of replacing a binder by an expandable sheet prepared from expanded microspheres is applied. However, there are still many problems when it is applied to the electrode assembly.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems of difficulty in assembling magnetic materials and labor saving, the utility model provides a coating structure and a magnet comprising the coating structure, in particular to a neodymium iron boron magnet.
The present invention provides a coating composition containing a foam.
Preferably, the foam is expandable upon heating at or above an expansion temperature, the expansion being irreversible. Preferably, the volume of the foam after expansion is produced is expandable by at least 100%. Preferably, the foam is selected from a physical foam or a chemical foam. Preferably, the expansion temperature of the foam is 100-.
According to an embodiment of the present invention, the coating composition comprises a resin, a foam, a curing agent, an additive, and an auxiliary.
According to an embodiment of the utility model, the components of the coating composition comprise, in parts by weight: 10-50 parts of resin, 5-40 parts of foaming body, 2-10 parts of curing agent, 0.5-10 parts of additive and 0.5-15 parts of auxiliary agent.
According to an embodiment of the present invention, the resin is selected from at least one of an aqueous thermoplastic resin, an aqueous thermosetting resin, or a hot-melt filling resin.
Preferably, the aqueous thermoplastic resin is at least one selected from aqueous acrylic resins and polyurethane resins.
Preferably, the aqueous thermosetting resin is selected from at least one of aqueous epoxy resin and hydroxy acrylic acid.
Preferably, the hot-melt filling resin is selected from at least one of modified chlorinated polyvinyl chloride, polyester, polyurethane, polyamide, polyether sulfone, epoxy resin and polymethyl methacrylate.
Illustratively, the epoxy resin is a bisphenol A type epoxy resin, preferably a bisphenol A type epoxy resin having a softening point between 50 and 95 ℃.
Preferably, the resin content is 15 to 25 parts by weight.
According to an embodiment of the present invention, the foam is selected from expandable microspheres, carbonate inorganic foaming agents, azo-based organic foaming agents, sulfonyl hydrazide based organic foaming agents, preferably expandable microspheres. Preferably, the expandable microspheres have an average particle size of 5-50 μm, preferably 5-20 μm, more preferably 10-15 μm. Illustratively, the expandable microspheres are selected from 920DU80 and 920DU40 mixtures in the Expancel series of AKZO-Nobel, wherein the weight ratio of the two is (1-2): (1-2), and the average particle size of the expandable microspheres is 14 μm, 17 μm or 20 μm.
Preferably, the content of the foam is 5 to 25 parts by weight or 5 to 40 parts by weight.
According to an embodiment of the present invention, the curing agent is selected from at least one of imidazole, an epoxy resin adduct of imidazole or an epoxy resin adduct of polyamine, preferably 2-methylimidazole. Preferably, the curing agent content is 3 to 6 parts by weight.
According to an embodiment of the utility model, the additive is selected from pigments and/or fillers, in particular at least one of talc, calcium carbonate, barium sulphate or insulating carbon black. Preferably, the additive is present in an amount of 1 to 2.5 parts by weight.
The inventors have found that the addition of the above additives to the coating not only reduces raw material costs but also imparts good gloss to the coating.
According to an embodiment of the present invention, the auxiliary agent is selected from at least one of a dispersant, a coupling agent, a defoaming agent, a wetting agent, a thickener, a curing agent, and a film-forming auxiliary agent. Illustratively, the dispersant may be selected from one of magnesium stearate and polyphosphate. Illustratively, the coupling agent may be selected from silane coupling agents. Illustratively, the defoamer is selected from one of polysiloxanes, fatty acid esters, such as dimethyl silicone oil, and the like. Illustratively, the wetting agent may be selected from one of polyoxyethylene alkylphenol ether and polyoxyethylene fatty alcohol ether. Illustratively, the thickening agent can be one of bentonite and sodium polyacrylate. Illustratively, the curing agent may be selected from one of diethylenetriamine and triethylenetetramine. Illustratively, the coalescent can be at least one of propylene glycol butyl ether or ethylene glycol butyl ether.
The inventor finds that the dispersing agent and the wetting agent can better disperse the foaming body and the filler, and the paint film formed by the coating is more uniform; the thickener can endow the paint with better rheological property, is convenient to produce and is convenient to cure and form; defoamers and wetting agents can reduce bubbles in the filler or foam.
According to an embodiment of the utility model, the coating composition optionally further comprises inorganic fibers. Preferably, the inorganic fibers are selected from one, two or more of nano alumina silicate fibers, carbon fibers and boron fibers.
According to an embodiment of the present invention, the composition may further comprise a solvent. Preferably, the solvent is at least one selected from an alcohol solvent (such as methanol and ethanol), an ether solvent (such as diethyl ether), and an aromatic hydrocarbon solvent (such as benzene), and preferably an alcohol solvent (such as ethanol).
According to an embodiment of the present invention, the coating composition may be selected from any one of a powder form, a liquid form, a turbid liquid, and the like.
According to an exemplary embodiment of the present invention, when the coating composition does not contain a solvent, the coating composition is a solid powder in which the expandable microspheres are contained in an amount of 5 to 40 parts by weight. The coating composition is heated, extruded, cooled and ground to a solid powder having a particle size of 10-80 μm, preferably an average particle size of 20-50 μm.
Preferably, the coating composition is a solid powder which is uniformly distributed on the surface of the magnet under the action of electrostatic charge and can be stably attached to the magnet.
According to an exemplary embodiment of the present invention, when the coating composition contains a solvent, the coating composition is a liquid or a suspension, and the expandable microspheres are contained in an amount of 5 to 25 parts by weight. The coating composition is liquid or suspension, the process operation of arranging the coating composition on the surface of the magnet is simpler, and the uniformity of the thickness of the coating is better.
The present invention also provides a coating comprising a first coating and a second coating, the first coating being interposed between a magnet and the second coating; the thickness of the first coating layer is greater than or equal to 0 μm and less than or equal to 20 μm, and the thickness of the second coating layer is greater than or equal to 20 μm and less than or equal to 300 μm, for example, greater than or equal to 50 μm and less than or equal to 250 μm.
It is to be understood that when the thickness of the first coating layer is 0 μm, the second coating layer is in contact with the magnet; when the thickness of the first coating layer is greater than 0 μm, the first coating layer is in contact with the magnet.
According to an embodiment of the utility model, the second coating contains a foam. Preferably, the foam is provided by the above coating composition.
Preferably, the foaming body is selected from expandable microspheres, carbonate inorganic foaming agents, azo-series organic foaming agents and sulfonyl hydrazide-series organic foaming agents;
more preferably, the foam is selected from expandable microspheres having an average particle size of 5-50 μm, preferably 5-20 μm, more preferably 10-15 μm;
more preferably, at least two of the expandable microspheres are not in contact with each other.
According to an embodiment of the utility model, the second coating may be used for heating expansion. Preferably, the second coating is expandable upon heating at or above an expansion temperature. Preferably, the thickness of the second coating after thermal expansion is 100-.
Preferably, the foam in the second coating expands upon expansion upon heating, the expansion temperature having the meaning as described above.
Preferably, after expansion by heating, the area of the foam in the cross section of the second coating layer is 70 to 95% of the total area. Preferably, the second coating is cellular (as shown in fig. 4) or corrugated (as shown in fig. 5) after expansion by heating. Preferably, the cellular or pleated second coating is formed by expanded foam.
To this end, the utility model also provides a coating (for example obtained by thermal expansion of the coating described above) comprising a first coating and a second coating, the first coating being interposed between the magnet and the second coating.
The thickness of the first coating layer is greater than or equal to 0 μm and less than or equal to 20 μm, and the thickness of the second coating layer is greater than or equal to 100 μm and less than or equal to 700 μm, for example, greater than or equal to 100 μm and less than or equal to 650 μm.
It is to be understood that when the thickness of the first coating layer is 0 μm, the second coating layer is in contact with the magnet; when the thickness of the first coating layer is greater than 0 μm, the first coating layer is in contact with the magnet.
According to an embodiment of the utility model, said thermal expansion refers to free expansion under heated conditions and in air.
According to an embodiment of the utility model, at least one surface of the second coating layer is cellular or corrugated.
According to an embodiment of the utility model, the second coating comprises expanded foam. Preferably, the foam is selected from expandable microspheres, carbonate inorganic foaming agents, azo-based organic foaming agents, sulfonyl hydrazide-based organic foaming agents.
According to an embodiment of the present invention, the second coating layer comprises a resin, an expanded foam, a curing agent, additives and auxiliaries.
According to an embodiment of the utility model, the expanded foam is selected from expanded expandable microspheres, and more than 50% of the expanded microspheres are in contact with other microspheres.
According to a preferred embodiment of the utility model, the expanded foam is selected from expanded expandable microspheres, and the contact area of the expanded microspheres with each other is larger than the contact area of the microspheres before expansion.
According to an embodiment of the present invention, the foam is provided by the above coating composition.
According to an embodiment of the utility model, the first coating is selected from at least one of a short term corrosion protection coating, a metallic coating or an insulating coating. Illustratively, the first coating includes a metal plating layer applied on the magnet base body and an insulating coating layer applied on the metal plating layer.
Preferably, the short term corrosion protection coating is selected from at least one of a phosphate coating, a passivation layer, a ceramic layer, a silane coating, a chelate coating, or the like. Preferably, the short-term corrosion protection coating is obtained by means of phosphating, passivation, vitrification, silanization, chelation or the like. Preferably, the short-term anticorrosion coating has a thickness of 0 μm or more and 5 μm or less. Illustratively, when the short-term corrosion protection coating is selected from the group consisting of phosphate coatings, the short-term corrosion protection coating has a thickness of 0 μm or more and 1 μm or less.
Preferably, the metal coating is selected from at least one of zinc, nickel, copper, aluminum, and the like or an alloy containing at least one of the foregoing metals. Preferably, the metal plating layer is obtained by any one of electroplating, physical plating, electroless plating, and the like. Preferably, the thickness of the metal plating layer is 0 μm or more and 15 μm or less, and preferably 5 μm or more and 15 μm or less.
Preferably, the insulating coating is selected from at least one of solvent-based paint, powder-based paint and water-based paint. Preferably, the insulating coating can be prepared by any one of electrophoresis, spray coating, dip coating, electrostatic coating, fluidized bed coating, and thermal spraying. Illustratively, the insulating coating is a polyurethane coating, an epoxy coating, or the like. Preferably, the thickness of the insulating coating is 0 μm or more and 20 μm or less, preferably 10 μm or more and 20 μm or less.
According to an exemplary aspect of the present invention, the coating layer includes a first coating layer and a second coating layer, wherein the first coating layer is a short term corrosion prevention layer, and the second coating layer is an intumescent coating layer.
According to an exemplary aspect of the present invention, the coating layer includes a first coating layer and a second coating layer, wherein the first coating layer is a metal plating layer, and the second coating layer is an expansion coating layer.
According to an exemplary aspect of the present invention, the coating layer includes a first coating layer and a second coating layer, wherein the first coating layer is an insulating coating layer, and the second coating layer is an intumescent coating layer.
The utility model also provides the neodymium iron boron magnet, at least one surface of the neodymium iron boron magnet is provided with the coating, and the first coating is arranged between the neodymium iron boron magnet and the second coating.
According to an embodiment of the present invention, the coating layer is obtained by disposing the above coating composition on the surface of a magnet substrate and subjecting it to a pre-curing treatment.
Illustratively, when the neodymium iron boron magnet is square, at least one surface of the square magnet is coated, for example, 1, 2, 3, 4, 5, or 6 surfaces thereof are coated.
According to an embodiment of the present invention, the neodymium iron boron magnet has the following properties:
(1) the expansion rate of the second coating is 150-400%;
(2) the shearing force of the coating is 1-15 Mpa;
(3) the oil resistance is more than 2000 h;
(4) the neutral salt spray performance reaches over 240 hours.
The utility model also provides a preparation method of the neodymium iron boron magnet, which comprises the following steps:
the first step is as follows: pretreating the surface of a magnet substrate;
the second step: disposing the coating on a surface of a magnet substrate: the coating comprises a first coating and/or a second coating;
the third step: and (5) carrying out pre-curing treatment to obtain the neodymium iron boron magnet.
According to an embodiment of the utility model, in the first step, the magnet base surface pretreatment comprises a cleanliness treatment of the surface of the magnet base, which is a neodymium iron boron magnet base.
Preferably, the cleanliness treatment comprises at least one of degreasing, rust removal, ash removal, water washing, or activation.
Preferably, the degreasing is to perform degreasing treatment on the neodymium iron boron product by adopting a non-foaming and non-phosphorus normal-temperature degreasing solution, and the treatment time is 120 s. Preferably, the derusting refers to derusting the degreased product by using dilute nitric acid with the volume concentration of 5%, and the treatment time is 40 s. Preferably, the water washing may be ultrasonic water washing. Preferably, the activation refers to activating the derusted neodymium iron boron product by using an activation liquid for 12s, wherein the activation liquid consists of 3.5 wt% of citric acid, 1g/L of thiourea and 1g/L of sodium dodecyl benzene sulfonate.
Illustratively, the cleanliness treatment includes degreasing, water washing, rust removal, ultrasonic water washing-water washing, activation, and water washing.
According to an embodiment of the utility model, in the second step, the first coating has the definition as described above. In the present invention, the type of the first coating layer is not particularly limited, and any one of the above first coating layers may be selectively arranged according to performance requirements such as corrosion resistance, conductivity, and the like of the magnet.
Preferably, after the first coating is applied, it is also dried thoroughly. Preferably, the drying temperature is 40 to 200 ℃, preferably 60 to 110 ℃. Preferably, the drying time is 5-90min, preferably 15-50 min.
Illustratively, when the first coating is a short-term corrosion resistant coating, the first coating can be prepared by any one of phosphating, passivation, vitrification, silanization, chelation, and the like. Preferably, the treatment time is 1-20min, preferably 1-10 min. For example, the first coating is prepared by phosphating through a dipping method, wherein the phosphating time is 5min, the temperature of phosphating solution is 50 ℃, and the product is dried after phosphating.
Illustratively, when the first coating layer is a metal coating layer, the metal coating layer can be prepared by any one of electroplating, physical coating, chemical plating, and the like. For example, the metal coating is prepared by electrodeposition nickel barrel plating.
Illustratively, when the first coating layer is an insulating coating layer, the insulating coating layer may be prepared by any one of electrophoresis, spray coating, dip coating, electrostatic coating, fluidized bed coating, thermal spraying, and the like. For example, the first coating is prepared by electrophoresis of an epoxy electrophoretic paint, wherein the epoxy electrophoretic paint has a pH of 5.0-6.5, an electric conductivity of 900-: the electrophoresis voltage is 100V-200V, the electrophoresis time is 100s-350s, and the electrophoresis temperature is 28-36 ℃.
According to an embodiment of the utility model, in a second step, the second coating layer is prepared from a coating composition. The coating composition has the definition as described above.
Preferably, the preparation method of the second coating layer comprises the following steps: the coating composition is disposed on top of the first coating or on the surface of the magnet substrate to form a second coating. The second coating can be prepared by any one of dipping, knife coating, brushing, stamping or spraying. For example, the second coating is prepared by electrostatic powder spraying, and specifically includes: and (2) charging the solid powder of the coating composition to negative electricity through a high-voltage electrostatic generator, and adsorbing the negatively charged powder to the surface of the positively charged magnet under the action of an electric field force due to the relation of potential difference, wherein the coating composition is extruded, cooled and ground into the solid powder after being heated before arrangement, the particle size of the solid powder is 10-80 μm, and the average particle size is preferably 20-50 μm.
The inventor finds that when the second coating is coated to be too thin, the expansion force of the second coating is insufficient when the second coating is heated after assembly, the required ejection force cannot be achieved, and the second coating is easy to fall off; if the coating is too thick, although the surface of the magnet is more favorable for forming a complete coating and has higher expansion rate, the coating is too thick and is more prone to shedding and cracking, and the coating is too thick, so that the rotor can cause higher eddy current loss in the using process.
In the present invention, in the third step, in the pre-curing treatment, heating may be performed by any heating method, for example, in an oven, using a heating roller, or electromagnetic heating, and the heating temperature may be lower than the expansion temperature of the foam. Preferably, the conditions of the pre-curing treatment include: the pre-curing temperature is 35-90 ℃, and the pre-curing time is 30-60 min.
The inventor finds that through the pre-curing treatment, the resin in the coating on the surface of the magnet begins to melt and gather, so that a flat and dense coating is formed on the surface of the magnet. After the pre-cure treatment, the foam (e.g., expandable microspheres) in the second coating layer remain in place in the coating layer so that heating at the later expansion temperature achieves natural expansion of the foam (e.g., expandable microspheres).
The inventors have also found that when the pre-curing temperature is too high, the flatness of the coating is reduced and even the adhesion of the magnet is caused, which in turn affects the expansion effect. The temperature uniformity of the heating treatment such as the oven should be controlled to avoid uneven heating.
Before the room temperature and the first heating procedure, the curing agent and the epoxy resin have undergone a slight reaction, so that the bonding effect of the second coating and the surface of the magnet or the first coating is increased before transportation, the second coating can be better bonded on the magnet substrate, and the transportation stability is higher.
The utility model also provides a rotor, which comprises the neodymium iron boron magnet.
Preferably, after the neodymium iron boron magnet is assembled on the rotor and is heated and expanded, the neodymium iron boron magnet is fixed on the rotor, and the assembly is completed.
Preferably, the expansion conditions include heating at or above the expansion temperature. Preferably, the expansion temperature is 100-.
The utility model also provides a motor, which is provided with the neodymium iron boron magnet or the rotor.
Has the advantages that:
the surface of the neodymium iron boron magnet is provided with the coating, the thickness of the coating is 20-300 mu m, after heating, the expansion rate is 100-400%, the shearing force is 1-15Mpa, the oil resistance is more than 2000h, and the neutral salt spray can reach more than 240 h.
The surface of the neodymium iron boron magnet is provided with the coating, so that the disadvantage of low corrosion resistance due to large pores is improved, the corrosion resistance of the whole magnet is improved, the insulativity is high, the thickness consistency is good, the corrosion resistance is high, and the binding force between the magnet and the magnetic steel groove is high.
According to the neodymium iron boron magnet, the types, the thicknesses and the like of the first coating and the second coating are selected, so that the problems that the laminated iron core or the laminated layer is not accurately positioned and the rotor is not balanced enough due to the fact that the design tolerance is not matched with the manufacturing tolerance are solved. And when the tolerance generated in the manufacturing process of the magnet and the rotor is larger, the types, thicknesses and the like of the first coating and the second coating can be improved, and the accurate positioning of the permanent magnet is further realized.
The magnet containing the coating is assembled to the motor, and the coating has expansibility when being heated, so that the assembly modes of common viscose glue, glue filling and the like can be replaced, the magnet product coated with the coating is directly assembled, and is fixed by utilizing the expansibility of the coating, so that the assembly cost is saved, the process is simple, the operation is convenient, the assembly precision is higher, and the environment is friendly.
When the coating is applied to motor assembly, the coating has the characteristics of good environmental protection, simple process, short preparation period and the like, can effectively improve the overall corrosion resistance and insulation property of the magnet, has good stability of the preparation process and better corrosion resistance, and further improves the binding force with the magnet and the magnetic steel groove.
Drawings
FIG. 1 is a schematic representation of the coatings of the present invention, wherein the first and second coatings have thicknesses H1, H2, respectively.
FIG. 2 is a schematic representation of the coatings of the present invention (after thermal expansion) and the second coating after thermal expansion has a thickness H2'.
FIG. 3 is a scan of the second coating cross-sectional topography of the sample of example 2 before thermal expansion.
FIG. 4 is a scan of the second coating cross-sectional profile after thermal expansion for the sample of example 2.
FIG. 5 is a scan of the second coating cross-sectional profile after thermal expansion for the sample of example 4.
Detailed Description
As shown in fig. 1, which is a schematic view of the coating of the present invention, the thicknesses of the first coating and the second coating are H1 and H2, respectively. The coating comprises a first coating and a second coating, the first coating being interposed between the magnet and the second coating; the thickness of the first coating is greater than or equal to 0 μm and less than or equal to 20 μm, and the thickness of the second coating is greater than or equal to 20 μm and less than or equal to 300 μm. When the thickness of the first coating layer is 0 μm, the second coating layer is in contact with a magnet; when the thickness of the first coating layer is greater than 0 μm, the first coating layer is in contact with the magnet.
In one embodiment of the present invention, the thickness of the first coating layer is 0 to 20 μm, and the thickness of the second coating layer is 20 to 300 μm. Preferably, the thickness of the second coating layer is 50-250 μm.
The second coating of the present invention may expand upon heating at or above the expansion temperature. As shown in fig. 2, which is a schematic representation of the coating of the present invention after expansion by heating, the expanded second coating has a thickness of H2'. Preferably, the thickness H2' of the second coating expands upon heating to 100-. In one embodiment of the present invention, the thickness H2' of the second coating layer after thermal expansion is 100 μm or more and 700 μm or less, for example 100 μm or more and 650 μm or less.
The technical solution of the present invention will be further described in detail with reference to specific embodiments. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.
Unless otherwise indicated, the raw materials and reagents used in the following examples are all commercially available products or can be prepared by known methods.
The following examples and comparative examples each use a 20mm x 10mm x 3.5mm gauge square ndfeb magnet product and the thickness of the coating in the following examples and comparative examples refers to the thickness at the center point of the coating.
In the following examples, the test methods for the samples are as follows:
SST experiment (neutral salt spray performance) test conditions are as follows: and (3) at the temperature of 35 ℃, the concentration of the NaCl aqueous solution is 50g/L +/-5 g/L, the pH value is between 6.5 and 7.2, the NaCl aqueous solution forms salt mist in a spraying mode, the salt mist is deposited on the neodymium iron boron magnet product to be detected, and the time for rusting on the surface of the magnet to begin to appear is recorded.
The test conditions of the damp-heat test are as follows: placing the neodymium iron boron magnet product in a closed environment with the temperature of 85 ℃ and the humidity of 85% RH, observing the corrosion condition of the surface of the magnet, recording the time when the coating on the surface of the magnet begins to change, and detecting the performance of the coating of the magnet again, wherein the time is the damp-heat resistant time when the influence is not produced.
The test conditions for immersion oil were: the neodymium iron boron magnet product is placed under the oil of a transmission case at 150 ℃ and is fully covered and soaked, the conditions of corrosion, bubbling, peeling and the like on the surface of the magnet are observed, the time when the coating on the surface of the magnet begins to change is recorded, the performance of the coating of the magnet is detected again, and when the influence is not produced, the time is the oil immersion resistant time.
The shear force test conditions were: GB/T7124-.
Example 1
Preparing a neodymium iron boron magnet, selecting a square neodymium iron boron product with the specification of 20mm multiplied by 10mm multiplied by 3.5mm as a magnet base body, and comprising the following steps:
firstly, magnet substrate surface pretreatment:
1) degreasing: degreasing the neodymium iron boron product by adopting a non-foaming and non-phosphorus normal-temperature degreasing liquid for 120 s;
2) washing twice with water;
3) derusting: carrying out rust removal treatment on the degreased product by using dilute nitric acid with the volume concentration of 5%, wherein the treatment time is 40 s;
4) after rust removal is finished, carrying out ultrasonic water washing-water washing on the product;
5) and (3) activation: activating the derusted neodymium iron boron product by using an activating solution, wherein the activating solution consists of 3.5 wt% of citric acid, 1g/L of thiourea and 1g/L of sodium dodecyl benzene sulfonate, and the activating time is 12 s;
6) and (5) washing twice to obtain the pretreated neodymium iron boron product.
Secondly, arranging a first coating: and (3) phosphating the magnet matrix after pretreatment by adopting an immersion method, wherein the phosphating time is 5min, and the temperature of the phosphating solution is 50 ℃. And after phosphorization, drying the magnet by blowing and drying to obtain the magnet with the surface containing a phosphorized layer as a short-term anti-corrosion coating, wherein the thickness of the phosphorized layer is 1 mu m.
Thirdly, preparing a coating composition: the coating composition is prepared from the following components in percentage by weight: 35% of hydroxyl acrylic resin, 40% of expandable microspheres (920 DU80 and 920DU40 in an Expancel series of AKZO-Nobel company are mixed according to a weight ratio of 1:1, and the average particle size is 17 mu m), 10% of 2-methylimidazole, 5% of insulating carbon black, 5% of ethylene glycol butyl ether and 5% of dimethyl silicone oil, heating the mixture, extruding, cooling and grinding the mixture to obtain a powdery coating, wherein the particle size of the powdery coating is 10-80 mu m, and the average particle size is 40 mu m.
Fourthly, arranging a second coating: the powder particles are charged with negative electricity through a high-voltage electrostatic generator by adopting an electrostatic powder spraying mode, and under the operation of electric field force, the powdery coating rushes to the surface of the magnet matrix with positive electricity.
Fifth, a first heating step: and after the second coating is arranged, carrying out pre-curing treatment, drying in a 70 ℃ oven for 40min, wherein the thickness of the cured second coating is 80 mu m, and thus obtaining the neodymium-iron-boron magnet.
Sixthly, a second heating procedure: thermal expansion conditions: oven 170 ℃, 5min, resulting in an expanded neodymium iron boron magnet, where the second coating expanded upon heating, denoted sample 1.
Example 2
In this example, the same magnet as in example 1 was used to prepare an ndfeb magnet, the pretreatment method was the same, and the first coating and the second coating were the same as in example 1, except that:
and (3) arranging the coating composition powder on the surface of the magnet substrate by adopting a brush coating method, carrying out pre-curing treatment, drying in a 75 ℃ oven for 35min, and obtaining the neodymium iron boron magnet, wherein the thickness of the cured second coating is 110 mu m. Heating expansion conditions: and (3) drying the neodymium iron boron magnet in an oven at 190 ℃ for 20min to obtain the expanded neodymium iron boron magnet, wherein the second coating expands after being heated and is recorded as sample 2.
Example 3
In this example, the same magnet as in example 1 was used to prepare an ndfeb magnet, and the pretreatment method was the same, except that:
a second coating identical to that of example 1 was directly applied without applying the first coating.
And (3) arranging the coating composition powder on the surface of the magnet substrate by adopting a brush coating method, carrying out pre-curing treatment, drying in a 75 ℃ oven for 35min, and obtaining the neodymium iron boron magnet, wherein the thickness of the cured second coating is 110 mu m. Heating expansion conditions: and (5) drying at 190 ℃ for 20min to obtain the expanded neodymium iron boron magnet, wherein the second coating expands after heating and is recorded as a sample 3.
Example 4
In this example, the same magnet as in example 1 was used to prepare an ndfeb magnet, and the pretreatment method was the same, except that:
and (3) preparing a first coating layer by performing electrodeposition barrel nickel plating on the pretreated magnet substrate, wherein the first coating layer is a nickel metal plating layer and has the thickness of 10 mu m.
Preparing a coating composition according to the following weight percentage: 30% of water-based acrylic resin, 25% of expandable microspheres (920 DU80 and 920DU40 in Expancel series of AKZO-Nobel, the average particle size is 20 μm, and the mixture is mixed according to a weight ratio of 2: 1), 5% of toluene diisocyanate, 2% of insulating carbon black, 3% of magnesium stearate, 2% of propylene glycol butyl ether, and the balance of ethanol, thereby obtaining a liquid coating composition.
And arranging the coating composition on the surface of the magnet substrate by adopting an immersion method, carrying out pre-curing treatment, drying in an oven at 80 ℃ for 20min, and obtaining the neodymium iron boron magnet, wherein the thickness of the cured second coating is 140 mu m. Heating expansion conditions: oven 200 ℃, 10min, resulting in an expanded neodymium iron boron magnet, where the second coating expanded upon heating, denoted sample 4.
Example 5
In this example, the same magnet as in example 1 was used to prepare an ndfeb magnet, and the pretreatment method was the same, except that:
after the magnet matrix which is pretreated, an epoxy coating is prepared as a first coating by adopting the following method: the electrophoretic voltage of the epoxy electrophoretic paint is 150V-200V; the electrophoresis time is 65-120 s; the pH value of the bath solution is 5.0-5.5; the conductivity of the bath solution is 1000-1500 mu S/cm; the electrophoresis temperature is 28-36 ℃. The thickness of the first coating epoxy was 15 μm.
Preparing a coating composition according to the following weight percentage: 15% of hydroxyl acrylic resin, 20% of polyurethane resin, 15% of expandable microspheres (920 DU80 and 920DU40 in Expancel series of AKZO-Nobel company are mixed according to the weight ratio of 1:2, the average particle size is 14 μm), 1% of toluene diisocyanate, 5% of nano aluminum silicate fibers, 3% of diethylenetriamine, 2% of silane coupling agent, 3% of bentonite and the balance of ethanol to obtain the liquid coating composition.
And arranging the coating composition on the surface of the magnet by adopting an immersion method, carrying out pre-curing treatment, drying in a 90 ℃ oven for 15min, and obtaining the neodymium iron boron magnet, wherein the thickness of the cured second coating is 180 mu m. Heating expansion conditions: oven 210 ℃, 15min, resulting in an expanded neodymium iron boron magnet, where the second coating expanded upon heating, denoted sample 5.
Comparative example 1
This comparative example used the same magnet as example 1 to prepare a neodymium iron boron magnet, and the magnet pretreatment method was the same except that:
preparing a coating composition according to the following weight percentage: 15% of hydroxyl acrylic resin, 20% of polyurethane resin, 15% of expandable microspheres (920 DU80 and 920DU40 in the Expancel series of AKZO-Nobel company are mixed according to the weight ratio of 1:2, and the average particle size is 14 mu m), 1% of toluene diisocyanate, 5% of nano aluminum silicate fiber, 5% of silane coupling agent, 3% of bentonite and the balance of ethanol.
And arranging the coating composition on the surface of the magnet by adopting an immersion method, carrying out pre-curing treatment, drying in a 90 ℃ oven for 15min, and obtaining the neodymium iron boron magnet, wherein the thickness of the cured second coating is 250 micrometers. Heating expansion conditions: and (5) drying at 210 ℃ for 15min to obtain the expanded neodymium iron boron magnet, wherein the second coating expands after being heated and is recorded as a comparative sample.
The sample treatment conditions and test results of examples 1-5 and comparative example 1 are shown in Table 1.
TABLE 1
As can be seen from the data of examples 1 and 2 in table 1, the increase in the thickness of the second coating layer can effectively increase the shearing force of the magnet at normal temperature by adjusting the arrangement thickness of the second coating layer. FIG. 3 is a scan of the cross-sectional profile of the second coating of the sample of example 2 before thermal expansion, FIG. 4 is a scan of the cross-sectional profile of the second coating of the sample of example 2 after thermal expansion, and FIG. 5 is a scan of the cross-sectional profile of the second coating of the sample of example 5 after thermal expansion. The second coating layer after being heated and expanded is in a honeycomb shape (as shown in figure 4) or a corrugated shape (as shown in figure 5), wherein the area of the foam body accounts for 70-95% of the cross-sectional area of the second coating layer, and the honeycomb shape or the corrugated shape is formed by the expanded foam body.
The difference between example 2 and example 3 is that example 3 does not contain a phosphate coating as the first coating, but it can be seen from table 1 that the first coating has a small influence on the expansion rate of the second coating, and example 3 can still achieve excellent expansion effect, while the roughness of the magnet surface is increased after the first coating is arranged in example 2 through phosphating, so the bonding force with the second coating is increased, and the shearing force at normal temperature is improved to a certain extent.
Comparing the data of example 4 and example 5 in table 1, it can be seen that, after the polyurethane resin, the curing agent (diethylenetriamine) and the film-forming aid (propylene glycol butyl ether) are added in example 5, the expansion rate of example 5 is high, and the shear force, the wet heat resistance and the oil resistance are better, because the film-forming effect of the coating is better due to the addition of the film-forming aid, and the curing agent is mutually infiltrated with the resin after the film-forming expansion of the coating, so that the effect of skeleton support and strength increase is achieved in the coating, and the strength and the shrinkage resistance of the coating are improved. The second coating of comparative example 1, which has a thickness of 250 μm and does not contain an epoxy coating as the first coating, has an excessive coating shrinkage risk after thermal expansion, resulting in misalignment of the workpiece, and an excessive assembly porosity resulting in a large eddy current loss, resulting in an impaired performance of the magnet, when the coating is assembled into the motor, although the expansion ratio and the adhesion thrust of comparative example 1 are not significantly reduced.
The exemplary embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, improvement and the like made by those skilled in the art within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (23)
1. A coating comprising a first coating and a second coating, the first coating being interposed between a magnet and the second coating;
the thickness of the first coating is more than or equal to 0 μm and less than or equal to 20 μm, and the thickness of the second coating is more than or equal to 20 μm and less than or equal to 300 μm;
when the thickness of the first coating layer is 0 μm, the second coating layer is in contact with a magnet;
when the thickness of the first coating layer is greater than 0 μm, the first coating layer is in contact with the magnet.
2. The coating of claim 1, wherein the second coating comprises foam.
3. Coating according to claim 1, wherein the foam is selected from expandable microspheres having an average particle size of 5-50 μm.
4. A coating according to claim 3, wherein the expandable microspheres have an average particle size of 5-20 μm.
5. The coating of claim 4, wherein the expandable microspheres have an average particle size of 10-15 μ ι η; .
6. The coating of claim 3, wherein at least two of said expandable microspheres are not in contact with each other.
7. The coating of claim 1, wherein the thickness of the second coating is 50 μ ι η or greater and 250 μ ι η or less.
8. The coating of claim 1, wherein the first coating is selected from at least one of a short term corrosion protection coating, a metallic coating, or an insulating coating.
9. A coating according to claim 8, wherein the short term corrosion protection coating has a thickness of greater than 0 μm and equal to or less than 5 μm.
10. The coating of claim 8, wherein the metallic plating layer has a thickness greater than 0 μ ι η and equal to or less than 15 μ ι η.
11. The coating of claim 8, wherein the insulating coating has a thickness greater than 0 μ ι η and equal to or less than 20 μ ι η.
12. The coating of claim 11, wherein the insulating coating has a thickness of 10 μ ι η or more and 20 μ ι η or less.
13. A coating comprising a first coating and a second coating, the first coating being interposed between a magnet and the second coating;
the thickness of the first coating is more than or equal to 0 μm and less than or equal to 20 μm, and the thickness of the second coating is more than or equal to 100 μm and less than or equal to 700 μm;
the coating is obtained by heating expansion of the coating according to any one of claims 1 to 12, wherein the heating expansion is free expansion under heating and in air.
14. The coating of claim 13, wherein the second coating is in contact with a magnet when the first coating has a thickness of 0 μ ι η;
when the thickness of the first coating layer is greater than 0 μm, the first coating layer is in contact with the magnet.
15. The coating of claim 13, wherein the thickness of the second coating is equal to or greater than 100 μ ι η and equal to or less than 650 μ ι η.
16. The coating of claim 13, wherein at least one surface of the second coating is cellular or corrugated.
17. The coating of claim 13, wherein the second coating comprises expanded foam.
18. Coating according to claim 17, wherein the expanded foam is selected from expanded expandable microspheres, and wherein more than 50% of the expanded microspheres are in contact with other microspheres.
19. A coating according to claim 17, wherein the area of the foam in a cross-section of the expanded second coating is 70-95% of the area of the cross-section.
20. Coating according to claim 17, wherein the expanded foam is selected from expanded expandable microspheres and the contact area of the expanded microspheres with each other is larger than the contact area of the microspheres with each other before expansion.
21. A neodymium iron boron magnet, characterized in that at least one surface of the neodymium iron boron magnet is arranged with a coating according to any one of claims 1-12 or a coating according to any one of claims 13-20, wherein the first coating is interposed between the neodymium iron boron magnet and a second coating.
22. A rotor comprising the ndfeb magnet of claim 21.
23. An electric machine comprising a neodymium-iron-boron magnet as claimed in claim 21 or a rotor as claimed in claim 22.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122078918.6U CN216919083U (en) | 2021-08-31 | 2021-08-31 | Coating, neodymium iron boron magnet containing coating, rotor and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122078918.6U CN216919083U (en) | 2021-08-31 | 2021-08-31 | Coating, neodymium iron boron magnet containing coating, rotor and motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216919083U true CN216919083U (en) | 2022-07-08 |
Family
ID=82223574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122078918.6U Active CN216919083U (en) | 2021-08-31 | 2021-08-31 | Coating, neodymium iron boron magnet containing coating, rotor and motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216919083U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113881294A (en) * | 2021-08-31 | 2022-01-04 | 烟台正海磁性材料股份有限公司 | Coating, neodymium iron boron magnet and preparation method and application thereof |
-
2021
- 2021-08-31 CN CN202122078918.6U patent/CN216919083U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113881294A (en) * | 2021-08-31 | 2022-01-04 | 烟台正海磁性材料股份有限公司 | Coating, neodymium iron boron magnet and preparation method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113881294A (en) | Coating, neodymium iron boron magnet and preparation method and application thereof | |
| CN102031052B (en) | Neodymium iron boron rare earth permanent magnet surface coating and application method thereof | |
| KR100957941B1 (en) | Pre-sealed steel sheet with improved anti-corrosion and weldability and preparing method thereof | |
| CN101116855B (en) | Method for preparing corrosion-protection composite coating for the steel metalwork | |
| CN107931062B (en) | Preparation method of wear-resistant and anti-corrosion coating on surface of sintered neodymium-iron-boron magnet | |
| CN216919083U (en) | Coating, neodymium iron boron magnet containing coating, rotor and motor | |
| CN113388306B (en) | Coating composition and preparation method and application thereof | |
| KR20090122194A (en) | Conductive, organic coatings with low layer thickness and good plasticity | |
| CN102936455B (en) | Neodymium iron boron rare earth permanent magnet surface anti-corrosion coating and preparation method thereof | |
| CN110669415A (en) | Organic coating steel plate and manufacturing method and application thereof | |
| CN112940554A (en) | Zn-Al coating with sintered neodymium-iron-boron as base body and preparation method thereof | |
| CN115244143A (en) | Dual layer dielectric coating | |
| CN105602372A (en) | Magnesium alloy surface protective high-hardness corrosion resistance composite coating and preparation method thereof | |
| KR100442224B1 (en) | Cationic electrodepositable composition, and method of electrocoating an electroconductive substrate using the same composition | |
| CN113512335A (en) | Water-based paint composition for cold chain container | |
| CN111073467B (en) | Corrosion-resistant composite protective layer material for neodymium iron boron | |
| CN116970295A (en) | Corrosion-resistant phosphate composite coating with 'brick-mud' layered structure and preparation method and application thereof | |
| CN112176286A (en) | Coating, metal magnet with coating and preparation method of coating | |
| CN110594328B (en) | Self-lubricating steel plate spring and preparation method thereof | |
| CN114713481A (en) | Corrosion-resistant magnesium alloy with multi-stage protective coating and preparation method thereof | |
| CN103342957A (en) | Fluoropolymer anticorrosive coating for fastener and preparation method thereof | |
| Constantinides | Permanent magnet coatings and testing procedures | |
| JPH0220336A (en) | Organic coating | |
| CN101623942B (en) | Magnalium honeycomb plate and preparation method thereof | |
| US20220243353A1 (en) | Connecting Element for the Friction-Increasing Connection of Components, Process for Making a Connecting Element and Use of a Connecting Element |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |