CN114574013A - High-adhesion inorganic expansion coating for magnet - Google Patents
High-adhesion inorganic expansion coating for magnet Download PDFInfo
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- CN114574013A CN114574013A CN202210485575.1A CN202210485575A CN114574013A CN 114574013 A CN114574013 A CN 114574013A CN 202210485575 A CN202210485575 A CN 202210485575A CN 114574013 A CN114574013 A CN 114574013A
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- magnet
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- expansion coating
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
- C09D5/185—Intumescent paints
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/322—Ammonium phosphate
- C08K2003/323—Ammonium polyphosphate
-
- 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
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Hard Magnetic Materials (AREA)
Abstract
The invention belongs to the technical field of anticorrosive coatings, and relates to a high-adhesion magnet inorganic expansion coating without viscosity at normal temperature, which comprises the following components in percentage by weight: 15-35% of a film forming agent, 1-5% of a film forming additive, 0.5-3% of silica sol, 2-10% of an expanding agent and the balance of water; wherein the film forming agent is prepared from an inorganic film forming agent and an organic film forming agent according to a weight ratio of 9: (1-9). The inorganic coating has better high temperature resistance, good corrosion resistance to iron, metal or silicon steel sheets, stable coating property before combination with the metal clamping groove, convenient long-time storage or transportation, simple and convenient operation in the expansion process when being combined with the metal clamping groove and strong adhesive force.
Description
Technical Field
The invention belongs to the technical field of anticorrosive coatings, and relates to a high-adhesion neodymium iron boron anticorrosive coating for a metal clamping groove of a motor and a using method thereof, in particular to a high-adhesion magnet inorganic expansion coating which is not sticky at normal temperature.
Background
Compared with the traditional electric excitation motor, the permanent magnet motor has the characteristics of simple structure, light weight, small volume, less loss, high efficiency and the like, so that the permanent magnet motor has a very wide application range. Compared with a magnet surface-mounted permanent magnet motor, the magnet embedded permanent magnet motor has stronger weak magnetic diffusion capacity and torque density. Magnet-embedded permanent magnet machines are those in which magnets are bonded and secured by a liquid adhesive within slots (called "receiving holes" or "pockets") of the rotor or stator of the motor or generator. The liquid adhesive is generally applied to the surface of the magnet by inserting the magnet coated with the liquid adhesive into the slot of the rotor or stator, or by applying the liquid adhesive to the slot opening and inserting the magnet from the slot opening containing the liquid adhesive. Then, the rotor or the stator is placed at normal temperature or in a drying furnace, and the liquid adhesive is solidified, so that the magnet and the rotor or the stator are adhered and fixed. However, in the above-mentioned bonding method, since the liquid adhesive has adhesiveness before curing, the liquid adhesive is scraped off during insertion of the magnet into the slot, and most of the applied liquid adhesive does not enter the slot, which causes a problem of poor adhesion, and the scraped or overflowed liquid adhesive must be wiped off in a timely manner before curing, which results in poor workability. In addition, it is a matter of consideration to transport and store the magnet pre-coated with the liquid adhesive and to ensure that the adhesive does not lose its function.
In CN110401277A, in order to solve the above problems, after a resin containing an expanding agent is applied to the surface of a magnet, a part of the resin is cured first in a first heating step, and the expanding agent in the resin is protruded on the surface to bring the adhesive into point contact with the groove, thereby suppressing deformation and peeling of the adhesive and suppressing poor adhesion. JP2007174872A selects normal temperature solid resin and adds foaming agent to make into foaming sheet, which is inserted into the gap between the magnet and the assembly groove, then the foaming sheet is heated to foam and expand, so that one surface of the foaming sheet is adhered to the outer surface of the magnet, and the other surface is adhered to the inner wall surface of the assembly groove. Therefore, the resin can be prevented from being pushed out of the module groove and leaking.
Although the problem of poor adhesion caused by easy peeling of the liquid adhesive can be solved by reducing the viscosity of the adhesive or processing the adhesive into a sheet shape for direct insertion into the gap, the resin with the reduced viscosity is still soft and easily contaminated, and is not convenient for long-term storage or transportation. The foamed sheet is processed into a magnetic body or a component groove, the foamed sheet needs to be correspondingly processed according to different sizes of the magnetic body or the component groove to increase the adaptability, the processing convenience is poor, the magnetic body and the groove are inserted into a gap and then are subjected to expansion bonding, the magnetic body and the groove need to be bonded with the outer surface of the magnetic body and the inner wall of the groove respectively, and the bonding strength of the foamed sheet is not completely convincing. Therefore, it is necessary to find a solution to the above-mentioned problems, which is convenient for both the bonded magnet and the metal card slot and also for long-term storage or transportation.
Disclosure of Invention
The invention aims to provide an inorganic expansion coating which is not sticky at normal temperature, is particularly suitable for a metal clamping groove motor, is an inorganic expansion coating for corrosion prevention of neodymium iron boron, can exert high adhesive force in the process of combining the metal clamping groove and the neodymium iron boron, is convenient for storage and transportation of a magnet, is convenient for assembly of the magnet and ensures that the magnet is more firmly bonded in the motor after expansion. The specific method comprises the following steps:
the inorganic expansion coating for the high-adhesion magnet comprises the following components in percentage by weight: 15-35% of a film forming agent, 1-5% of a film forming additive, 0.5-3% of silica sol, 2-10% of an expanding agent and the balance of water; wherein the film forming agent is prepared from an inorganic film forming agent and an organic film forming agent according to a weight ratio of 9: (1-9).
Further, the expanding agent is ammonium polyphosphate.
Further, the expanding agent also comprises expandable graphite.
Further, the inorganic film forming agent comprises one or more of silica sol, aluminum sol, silica-alumina sol, titanium sol, zirconium sol, potassium silicate, sodium silicate, ethyl silicate, aluminum dihydrogen phosphate and aluminum phosphate; the organic film forming agent is water-based silicone resin.
Further, the film forming auxiliary agent comprises one or more of zinc oxide, iron oxide, magnesium oxide, copper oxide and manganese oxide.
Further, the high adhesion force is embodied in the process of combining the motor clamping groove and the magnet.
Further, the invention also provides a use method of the inorganic expansion coating of the high-adhesion magnet, which comprises the following steps of (1) preparing the mixed solution of the inorganic expansion coating according to the formula amount, and placing for later use; (2) spraying, dipping or brushing the prepared inorganic expansion coating mixed solution on the surface of the magnet after surface treatment; (3) drying the magnet obtained in the step (2) at 60-80 ℃ to obtain a magnet with the inorganic expansion coating; (4) and (4) after the magnet processed in the step (3) is inserted into the motor clamping groove, baking and expanding at the temperature of 200-250 ℃ so that the surface coating of the magnet is bonded with the motor clamping groove.
Further, the motor slot is mounted on a motor used in a coolant or a lubricant.
Further, the thickness of the inorganic expansion coating is 80-120 microns.
The invention has the advantages and positive effects that:
(1) the invention adopts the inorganic coating, and meets the requirement of high adhesive force and high adhesive force by the principle of chemical bond combination; meanwhile, the corrosion-resistant lubricating grease has the advantages of good temperature resistance, good oil resistance and the like, and is particularly suitable for corrosion prevention of the neodymium iron boron magnet used in an oily environment such as engine cooling oil;
(2) after the magnet coated by the inorganic expansion coating with high adhesive force and the use method thereof is combined with a metal clamping groove, the expansion rate of the coating is between 100 and 200 percent, and the shear strength after expansion is more than 5 (MPA);
(3) the inorganic coating has better high temperature resistance, good corrosion resistance to iron, metal or silicon steel sheets, stable coating property before being combined with the metal clamping groove, convenient long-time storage or transportation, simple and convenient operation in an expansion process when being combined with the metal clamping groove and strong adhesive force.
Detailed Description
The invention is further illustrated by the following and detailed description.
Example 1
The inorganic expansion coating for the high-adhesion magnet comprises the following components in percentage by weight: 15% of a film forming agent (wherein the mass ratio of the aluminum dihydrogen phosphate to the water-based silicone resin is = 9: 1), 1% of a film forming aid, 0.5% of silica sol, 2% of an expanding agent and the balance of water. In this example, the swelling agent is ammonium polyphosphate; the film-forming assistant is a mixture of zinc oxide, ferric oxide, magnesium oxide, copper oxide and manganese oxide. In the embodiment, the silica sol is added to improve the corrosion resistance, and the Y128 water-based organic silicon resin is adopted as the water-based silicon resin, so that the paint has the characteristics of no toxicity, no color, quick curing time and good waterproof performance, and has good chemical affinity with inorganic paint.
The specific use method is as follows: (1) preparing inorganic expansion coating mixed liquor according to the formula amount, and placing for later use; (2) spraying, dipping or brushing the prepared inorganic expansion coating mixed solution on the surface of the magnet after surface treatment; (3) drying the magnet obtained in the step (2) at 60 ℃ to obtain a magnet with an inorganic expansion coating (the thickness of the coating is 80 microns); (4) and (4) inserting the magnet processed in the step (3) into the motor clamping groove, and baking and expanding at 200 ℃ to enable the surface coating of the magnet to be bonded with the motor clamping groove.
The magnet coated in the embodiment 1 is baked at 200 ℃ for 1.5 hours after being combined with a metal clamping groove, the coating expansion rate is more than 100%, the shear strength after expansion is more than 5 (MPA), and the use requirement is met.
Example 2
The inorganic expansion coating for the high-adhesion magnet comprises the following components in percentage by weight: 35% of a film forming agent (wherein the mass ratio of aluminum dihydrogen phosphate to the water-based silicone resin is = 9: 9), 5% of a film forming aid, 3% of silica sol, 10% of an expanding agent and the balance of water; wherein the inorganic expanding agent consists of expanded graphite and ammonium polyphosphate; the film-forming auxiliary agent is zinc oxide; the aqueous silicon resin of the embodiment adopts 103 aqueous inorganic silicon resin (Malus hupehensis chemical industry), has the characteristics of good bonding force with various metals, and is a quick-drying inorganic coating.
The specific application method is the same as that of example 1.
The coated magnet is combined with a metal clamping groove and then baked for 1 hour at 200 ℃, the coating expansion rate is more than 100 percent, the shear strength after expansion is more than 5 (MPA), and the use requirement is met. It can be seen from examples 1 and 2 that the addition of expanded graphite can improve the expansion efficiency.
Example 3
The inorganic expansion coating for the high-adhesion magnet comprises the following components in percentage by weight: 25% of a film forming agent (wherein the mass ratio of the aluminum dihydrogen phosphate to the water-based silicone resin is = 9: 5), 2% of a film forming assistant, 2% of silica sol, 5% of an expanding agent and the balance of water; wherein the inorganic expanding agent consists of expanded graphite and ammonium polyphosphate; the film-forming auxiliary agent is a mixture of zinc oxide and ferric oxide; the aqueous silicone resin used in this example was TC11 (zhejiang yuda chemical limit company) aqueous inorganic silicone resin.
The specific application method is the same as that of example 1, except that the magnet drying temperature in the step (3) is 80 ℃, and the thickness of the inorganic expansion coating of the obtained magnet is 120 microns; and (4) after the magnet is inserted into the motor clamping groove, baking at 250 ℃ to expand so that the surface coating of the magnet is bonded with the motor clamping groove.
The coated magnet is combined with a metal clamping groove and then baked for 1.5 hours at 250 ℃, the expansion rate of the coating reaches 200%, the shear strength after expansion is more than 5 (MPA), and the use requirement is met.
According to the embodiment, after the high-adhesion magnet inorganic expansion coating and the use method thereof are assembled, the expansion graphite generates stress by heating, meanwhile, the ammonium polyphosphate discharges the phosphoric acid to expand the initially-fixed inorganic coating, the discharged phosphoric acid plays a role in loosening the inorganic coating at the beginning, but the phosphoric acid reacts with metal oxide, neodymium iron boron permanent magnet and metal clamping grooves in the phosphoric acid along with reaction and temperature to form a three-dimensional net type structure; the three-dimensional net structure is reinforced along with the rise of temperature, organic silicon resin is crosslinked and cured in the three-dimensional net structure, and the combination of chemical bonds provides powerful support for high adhesive force and high adhesive force; after the magnet is combined with the metal clamping groove, the expansion rate of the coating is between 100 and 200 percent, and the shear strength after expansion is more than 5 (MPA).
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (8)
1. The inorganic expansion coating for the high-adhesion magnet is characterized by comprising the following components in percentage by weight: 15-35% of a film forming agent, 1-5% of a film forming additive, 0.5-3% of silica sol, 2-10% of an expanding agent and the balance of water; wherein the film forming agent is prepared from an inorganic film forming agent and an organic film forming agent according to a weight ratio of 9: (1-9); wherein the swelling agent comprises ammonium polyphosphate.
2. The high-adhesion magnet inorganic expansion coating of claim 1, wherein: the expanding agent also includes expandable graphite.
3. The high adhesion magnet inorganic expansion coating of claim 1, wherein: the inorganic film forming agent comprises one or more of silica sol, aluminum sol, silica-alumina sol, titanium sol, zirconium sol, potassium silicate, sodium silicate, ethyl silicate, aluminum dihydrogen phosphate and aluminum phosphate; the organic film forming agent is water-based silicone resin.
4. The high adhesion magnet inorganic expansion coating of claim 1, wherein: the film forming auxiliary agent comprises one or more of zinc oxide, ferric oxide, magnesium oxide, copper oxide and manganese oxide.
5. The high adhesion magnet inorganic expansion coating of claim 1, wherein: the high adhesion is embodied in the process of combining the motor clamping groove and the magnet.
6. The method of using the inorganic expansion coating for high-adhesion magnet according to claim 5, wherein: the method comprises the following steps of (1) preparing the inorganic expansion coating mixed solution according to the formula amount, and standing for later use; (2) spraying, dipping or brushing the prepared inorganic expansion coating mixed solution on the surface of the magnet after surface treatment; (3) drying the magnet obtained in the step (2) at 60-80 ℃ to obtain a magnet with the inorganic expansion coating; (4) and (4) after the magnet processed in the step (3) is inserted into the motor clamping groove, baking and expanding at the temperature of 200-250 ℃ so that the surface coating of the magnet is bonded with the motor clamping groove.
7. The method of using the inorganic expansion coating for high-adhesion magnet according to claim 5, wherein: the motor clamping groove is arranged on a motor used in cooling liquid or lubricating oil.
8. The method of using the inorganic expansion coating for high-adhesion magnet according to claim 5, wherein: the thickness of the inorganic expansion coating is 80-120 microns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210485575.1A CN114574013A (en) | 2022-05-06 | 2022-05-06 | High-adhesion inorganic expansion coating for magnet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210485575.1A CN114574013A (en) | 2022-05-06 | 2022-05-06 | High-adhesion inorganic expansion coating for magnet |
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| CN114574013A true CN114574013A (en) | 2022-06-03 |
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| CN202210485575.1A Pending CN114574013A (en) | 2022-05-06 | 2022-05-06 | High-adhesion inorganic expansion coating for magnet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115433479A (en) * | 2022-10-18 | 2022-12-06 | 中国民航大学 | Preparation method of phosphate gum base flame-retardant heat-insulating coating highly ceramic when encountering fire |
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| CN103427559A (en) * | 2012-05-23 | 2013-12-04 | 瑞美技术有限责任公司 | Thermally conductive coating for permanent magnets in electric machine |
| CN107216693A (en) * | 2017-05-19 | 2017-09-29 | 海洋化工研究院有限公司 | Inorganic expansive fireproof coating and preparation method |
| CN112358781A (en) * | 2020-11-11 | 2021-02-12 | 北京斯坦塞建筑科技有限公司 | Elastic expansion type coating and preparation method thereof |
| CN112774959A (en) * | 2019-11-07 | 2021-05-11 | 大众汽车股份公司 | Process for coating magnets for rotors |
| CN112961528A (en) * | 2021-02-08 | 2021-06-15 | 大厂金隅涂料有限责任公司 | Environment-friendly fireproof coating and preparation method thereof |
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| CN113764150A (en) * | 2021-06-11 | 2021-12-07 | 烟台正海磁性材料股份有限公司 | Expandable sintered neodymium-iron-boron magnet and preparation method and application thereof |
| CN113861768A (en) * | 2021-09-24 | 2021-12-31 | 合肥工业大学 | Composite water-based flame-retardant heat-insulating coating and preparation method thereof |
| 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 |
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2022
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| JPH10110121A (en) * | 1996-10-08 | 1998-04-28 | Kikusui Kagaku Kogyo Kk | Fire resistant coating material |
| JPH10316900A (en) * | 1997-05-20 | 1998-12-02 | Kikusui Kagaku Kogyo Kk | Formation of refractory coating layer |
| JP2010141989A (en) * | 2008-12-10 | 2010-06-24 | Nissan Motor Co Ltd | Permanent magnet motor and permanent magnet fixing method |
| DE102011119512A1 (en) * | 2011-11-26 | 2013-05-29 | Volkswagen Aktiengesellschaft | Method for manufacturing rotor of permanent magnet-excited electric machine, involves solidifying coated material for formation of solidified coating, and heating base body, where microspheres are embedded into coating material |
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| CN115433479A (en) * | 2022-10-18 | 2022-12-06 | 中国民航大学 | Preparation method of phosphate gum base flame-retardant heat-insulating coating highly ceramic when encountering fire |
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Application publication date: 20220603 |