CN113817386A - Magnetic material surface magnetic permeability expansion type coating and preparation method and application thereof - Google Patents
Magnetic material surface magnetic permeability expansion type coating and preparation method and application thereof Download PDFInfo
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- CN113817386A CN113817386A CN202111015004.3A CN202111015004A CN113817386A CN 113817386 A CN113817386 A CN 113817386A CN 202111015004 A CN202111015004 A CN 202111015004A CN 113817386 A CN113817386 A CN 113817386A
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Images
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- 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
- C09D5/23—Magnetisable or magnetic paints or lacquers
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
-
- 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
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0856—Iron
-
- 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
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0862—Nickel
Abstract
The invention discloses a magnetic material surface magnetic permeability expansion type coating and a preparation method and application thereof, the magnetic permeability material is introduced into the expansion type coating, under the condition of keeping the original coating thickness, the influence of the expanded coating on the magnetic flux of a product can be reduced, so that the magnetic flux retention rate of the expanded product is improved, the residual magnetism pressure of a base material is properly relieved, the magnetic loss is reduced, meanwhile, the expansion rate of the coating and the shearing force and other properties of the expanded coating are basically kept unchanged, and meanwhile, the anti-corrosion performance of the coating can be further improved based on the higher anti-corrosion performance of the magnetic permeability material which is uniformly distributed in the coating on chlorine salt, inorganic acid and the like, so that the medium salt mist performance of the coating is up to more than 312h, and the oil resistance is more than 2000 h. The expansion type coating composition is directly coated on the surface of a magnet, and the coating can be expanded by heating to the temperature of 150 ℃ and 280 ℃, so that the assembly of the magnet can be realized without conventional treatment such as gluing, glue pouring and the like.
Description
Technical Field
The invention belongs to the technical field of neodymium iron boron magnets, and particularly relates to a magnetic material surface magnetic permeability expansion type coating, and a preparation method and application thereof, in particular to a magnetic material surface magnetic permeability expansion type coating such as neodymium iron boron, and a preparation method and application thereof.
Background
Based on the advantages of the neodymium iron boron, the neodymium iron boron can be widely applied to industries such as information technology, automobiles, motors, wind power, hybrid electric vehicles and the like. Nd-Fe-B magnet2Fe14The main phase B and the intergranular Nd-rich phase form, and the electrochemical potential difference between the phases of the magnetic material with the multiphase structure is large, so that the electrochemical corrosion is easy to cause. Neodymium is one of the elements with higher chemical activity, so that electrochemical corrosion is easy to occur, and therefore, before application, surface treatment is required to endow the element with an anti-corrosion function.
Typical surface treatment methods include short-term anticorrosion coating, electrodeposition coating, electrophoresis, spray coating, physical vapor deposition, composite coating, and the like. The short-term anti-corrosion coating comprises modes of phosphating, vitrification, silane conversion and the like, and is low in cost and simple and convenient to operate; the electro-deposition coating comprises nickel, zinc, copper, alloy and a composite coating thereof so as to meet diversified requirements; electrophoresis and spraying can be used for products with insulation requirements, and the products have high corrosion resistance; the physical vapor deposition can obtain a high-quality coating, and can select two modes of rolling and hanging aiming at products with different sizes; the composite coating can meet high-demand products and has excellent performance. However, the coatings require conventional assembly methods, which results in high assembly costs and thus limited application.
To reduce assembly costs and ease of operation, intumescent coatings have been developed. The expansion type coating can not only reduce the assembly cost, but also meet the required anti-corrosion effect, and is an environment-friendly assembly mode. However, the thickness of the intumescent coating is too thick, which affects the effective magnetic flux of the product and increases the pressure on the performance and cost of the substrate. Therefore, how to prepare the magnetic expansion type coating can reduce the assembly cost and relieve the pressure of the base material, and the operation convenience is a technical problem to be solved urgently.
Patent application No. CN101341201A discloses a solid powder composition comprising unexpanded but thermally expandable microspheres comprising a thermoplastic polymer shell encapsulating a propellant. The invention provides a method of handling polymer resins having expanded or thermally expandable microspheres as an additive.
In DE102014214381a 1a method is disclosed for manufacturing a rotor for a permanent magnet electrical machine, where permanent magnets are coated with a matrix coating containing expanded microspheres and inserted into rotor slots, and the rotor body is heated to fix the permanent magnets. Similarly, in patent CN107408851A, a rotor for a rotating electrical machine and a manufacturing method thereof are disclosed, wherein a rotor core includes a magnet and an adhesive layer, the adhesive layer is disposed between the permanent magnet and a wall surface of the magnet hole portion, and contains a plurality of capsule bodies therein, and the capsule bodies are heated and expanded to perform an adhesive function.
The above method achieves the fixation of the rotor by using an intumescent coating or a binding layer, but in this method the thickness of the intumescent coating or binding layer is greater with respect to the thickness of the traditional coating. Therefore, the distance between the magnetic steel and the iron core is larger than that between the traditional magnetic steel and the iron core, and the larger gap can lead to the increase of the magnetic flux loss of the magnetic steel, namely the effective magnetic flux is reduced.
Disclosure of Invention
In order to improve the technical problem, the present invention provides a magnetic permeability intumescent coating composition, comprising the following components: epoxy resin, expandable microspheres, a curing agent, an additive, a defoaming agent, an anti-settling agent, a leveling agent, a magnetic conductive agent and a solvent.
According to an embodiment of the invention, the weight percentage of epoxy resin in the composition is 30-60%, such as 35-55%.
According to an embodiment of the invention, the weight percentage of expandable microspheres in the composition is 5-15%, such as 8-13%.
According to an embodiment of the invention, the weight percentage of curing agent in the composition is 2-10%, such as 3-6%.
According to an embodiment of the invention, the weight percentage of additives in the composition is 10-25%, such as 15-23%.
According to an embodiment of the invention, the weight percentage of antifoam in the composition is 0.5-1%, such as 0.7-0.9%.
According to an embodiment of the invention, the weight percentage of the anti-settling agent in the composition is 0.05-0.3%, such as 0.1-0.2%.
According to an embodiment of the invention, the weight percentage of the levelling agent in the composition is 0.1-0.5%, such as 0.2-0.5%.
According to an embodiment of the invention, the weight percentage of the magnetic permeability agent in the composition is 1-10%, such as 3-8%.
According to an embodiment of the invention, the composition further comprises a solvent; for example, the solvent is 15-35% by weight.
According to an embodiment of the invention, the sum of the weight percentages of the components in the composition is 100%.
According to an embodiment of the present invention, the epoxy resin is a bisphenol a type epoxy resin; bisphenol A type epoxy resins with the softening point of 50-95 ℃ are preferred, and epoxy resin E-20 and epoxy resin E-12 are exemplified.
According to an embodiment of the invention, the expandable microspheres have a diameter of 9-50 μm; preferably, the diameter is 9-20 μm.
According to embodiments of the present invention, the curing agent includes, but is not limited to, one, two or more of imidazole, an epoxy resin adduct of imidazole, or an epoxy resin adduct of polyamine; preferably imidazole, one, two or more of epoxy resin adducts of imidazole; for example, the curing agent is 2-methylimidazole.
According to an embodiment of the invention, the additive is a pigment and/or a filler; for example, it may be one, two or more of talc, calcium carbonate, barium sulfate, and carbon black.
According to the embodiment of the invention, the defoaming agent can be one or more of polysiloxane defoaming agent, tributyl phosphate, polyether modified silicon and/or a solution containing the substances; preferably, the polysiloxane antifoaming agent may be dimethicone or a solution containing dimethicone.
According to an embodiment of the invention, the anti-settling agent comprises polyethylene wax, polyamide wax syrup and ASD103, preferably the weight ratio of polyethylene wax, polyamide wax syrup, ASD103 is 3 (0.8-1.2) to (0.5-1.0), exemplary being 3:0.8:0.5, 3:0.8:1.0, 3:1.2:0.5, 3:1:0.8, 3:1.2: 1.0.
According to an embodiment of the present invention, the leveling agent may be one, two or more of an acrylic leveling agent, an organic silicon leveling agent and a modified acrylic leveling agent, and is exemplified by a phosphate modified acrylic leveling agent.
According to the embodiment of the invention, the magnetic permeability agent comprises one, two or more of powders of magnetic elementary substance such as Fe, Co, Ni or the like or magnetic compound thereof, soft magnetic powder of FeNi alloy and the like.
Preferably, the particle size of the magnetic permeability agent is 1-50 μm; more preferably, the particle size is 1-20 μm, illustratively 1 μm, 5 μm, 10 μm, 15 μm, 20 μm, 30 μm, 40 μm, 50 μm.
The invention is beneficial to improving the compactness and the bonding force of the coating by adopting the magnetic conductive metal powder with smaller granularity. And if the particle size of the magnetic permeability agent is too large, the surface of the coating is easily rough, so that the compactness of the coating is poor. Meanwhile, the magnetic permeability agent with approximate spherical particle morphology (the long rod shape is optimal) is preferably selected, so that components such as resin in the coating can uniformly wrap the magnetic permeability agent, the magnetic permeability agent and the resin in the coating are uniformly mixed, the coating has good compressibility, air gaps of the coating are reduced, diamagnetism among the metal magnetic particles is reduced (namely, energy loss caused by magnetic poles of the metal magnetic particles is reduced), hysteresis loss caused by diamagnetism is reduced to the minimum, and reduction of saturation magnetic flux density and eddy current loss are reduced to the minimum.
According to the invention, the weight percentage of each component of the expandable coating containing the magnetic permeability agent is limited within the above range, and when the weight percentage of the magnetic permeability agent in the composition is 1-10% (such as 3-8%), the magnetic permeability, viscosity, dryness and the like of the coating can be improved, so that the spraying requirement of the coating is met, and the quality of the coating prepared from the coating is improved.
The soft magnetic powder of the FeNi alloy has the characteristics of high saturation magnetic flux density, low loss, high direct current superposition, good cladding property and good wear resistance, and the prepared coating has the characteristics of good stability, high magnetic conductivity, good insulation and pressure resistance, excellent saturation property and the like after being added into the coating.
According to an embodiment of the present invention, the solvent may be at least one selected from the group consisting of dichloroethane, acetone, toluene, xylene, ethanol, benzyl alcohol, and phenol; preferably, the solvent is ethanol.
The invention also provides application of the intumescent coating composition in preparing a magnetic material surface magnetic permeability intumescent coating.
The invention also provides a magnetic material surface magnetic permeability expansion type coating which is prepared from the expansion type coating composition.
According to an embodiment of the invention, the thickness of the magnetically permeable intumescent coating before expansion is 20-300 μm, exemplary 20 μm, 50 μm, 100 μm, 200 μm, 300 μm.
According to an embodiment of the invention, the magnetically permeable intumescent coating has an expansion ratio of 50-300%, exemplary 50%, 100%, 200%, 300%.
According to an embodiment of the invention, the shear force of the magnetically permeable expanded coating is 1-10MPa, exemplary 1MPa, 2MPa, 5MPa, 8MPa, 10 MPa.
According to an embodiment of the invention, the oil resistance of the magnetically permeable intumescent coating is more than 2000h, exemplary 2100h, 2200h, 2300h, 2500h, 2800h, 3000 h.
According to an embodiment of the invention, the magnetically permeable intumescent coating has a neutral salt spray of > 260h, exemplary 260h, 264h, 270h, 280h, 288h, 300h, 312h, 320 h.
The invention also provides a preparation method of the magnetic permeability expansion coating, which comprises the step of coating the expansion coating composition on the surface of a substrate to form the magnetic permeability expansion coating.
According to an embodiment of the invention, the method of preparation further comprises a step of pre-treating the substrate. For example, the pretreatment may be a treatment such as phosphating and/or passivation and/or vitrification and/or silylation and/or chelation.
According to the embodiment of the invention, the time of the pretreatment is 1-20 min; preferably 1-10 min; exemplary are 1min, 2min, 5min, 8min, 10min, 15min, 20 min.
According to an embodiment of the present invention, the preparation method further comprises drying the pretreated substrate.
According to an embodiment of the invention, the temperature of the drying is 40-200 ℃, preferably 60-110 ℃, exemplary 40 ℃, 60 ℃, 80 ℃, 100 ℃, 110 ℃, 130 ℃, 150 ℃, 180 ℃, 200 ℃.
According to an embodiment of the present invention, the drying time is 5-90min, preferably 15-50 min; exemplary are 5min, 10min, 15min, 20min, 30min, 40min, 50min, 60min, 70min, 80min, 90 min.
According to an embodiment of the present invention, the coating manner preparation method may be at least one of dip coating, blade coating, brush coating, spray coating, and the like.
The invention does not specially limit the specific process parameters in the coating process, and the person skilled in the art can select the conventional coating method known in the art to prepare the magnetic permeability expansion coating.
The invention also provides the application of the magnetic permeability expansion coating in corrosion prevention; preferably in the use of magnetic materials against electrochemical corrosion.
The invention has the beneficial effects that:
(1) the invention introduces the magnetic conductivity material into the expansion type coating, and can reduce the influence of the expanded coating on the magnetic flux of the product under the condition of keeping the original coating thickness, thereby obviously improving the magnetic flux retention rate of the expanded product, properly relieving the pressure of residual magnetism of the base material, reducing the magnetic loss, simultaneously keeping the expansion rate of the coating and the shearing force and other properties of the expanded coating unchanged basically, and simultaneously, based on the higher corrosion resistance of the magnetic conductivity material (such as iron-nickel alloy) which is uniformly distributed in the coating to chloride, inorganic acid and the like, the invention can further improve the corrosion resistance of the coating in a synergistic manner, thereby ensuring that the medium salt spray performance of the coating reaches more than 312h, and the oil resistance is more than 2000 h.
(2) The expansion type coating composition is directly coated on the surface of a magnet, and the coating can be expanded by heating to the temperature of 150-280 ℃, so that the aim of assembling the magnet can be fulfilled without conventional treatment such as gluing, pouring and the like.
Drawings
Fig. 1 is a schematic diagram of a product coated with a magnetic permeability expansion coating before and after expansion.
Fig. 2 is a photomicrograph of a cross-section of the magnetically permeable intumescent coating of example 1 prior to expansion.
FIG. 3 is a photomicrograph of an expanded section of the magnetically permeable intumescent coating of example 1.
Detailed Description
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.
Example 1
A magnetic expansion type coating composition comprises the following components in parts by weight:epoxy resin E-2040%, expandable microsphere 9% (Acksu)
The particle size of the expanded microsphere is 9-15 mu m), 4% of 2-methylimidazole, 18% of calcium carbonate (particle size is 0.1-1 mu m), 0.8% of simethicone, 0.13% of anti-settling agent, 0.35% of flatting agent, 5% of iron-based magnetic material (iron-nickel alloy powder, the particle size of magnetic material is 1-20 mu m, the average particle size is 8 mu m), and the balance of ethanol;
the anti-settling agent is a mixture of polyethylene wax, polyamide wax slurry and ASD103 in a weight ratio of 3:1: 0.8;
the leveling agent is phosphate modified acrylic acid.
As shown in figure 1, the coating composition is sprayed on the surface of a rare earth permanent magnet with the thickness of 5mm to prepare a magnetic conductive expansion type coating with the thickness of 100 mu m; the rare earth permanent magnet is subjected to silanization treatment before spraying, and the silane treatment process comprises the following steps: the rare earth permanent magnet is immersed in a silane coupling agent for 5min and then dried at 90 ℃ for 30 min.
FIG. 2 is a photomicrograph of a cross-section of the magnetically permeable intumescent coating of example 1 prior to expansion; FIG. 3 is a photomicrograph of an expanded section of the magnetically permeable intumescent coating of example 1. As can be seen from the figure: after the expansion by heating, the expansion microspheres are obviously enlarged compared with the expansion microspheres before the expansion, thereby realizing the expansion of the coating.
Example 2
A magnetic expansion type coating composition comprises the following components in parts by weight: epoxy resin E-1240% and expandable microsphere 9% (Acksu)
The particle size of the expanded microsphere is 10-16 mu m), the particle size of the 2-methylimidazole is 4%, the particle size of calcium carbonate is 18% (the particle size is 0.1-1 mu m), the content of simethicone is 0.8%, the anti-settling agent is 0.13%, the leveling agent is 0.35%, the content of the iron-based magnetic material is 5% (iron-nickel alloy powder, the particle size of the magnetic material is 1-20 mu m, the average particle size is 8 mu m), and the balance is ethanol;
the anti-settling agent is a mixture of polyethylene wax, polyamide wax slurry and ASD103 in a weight ratio of 3:1: 0.8;
the leveling agent is phosphate modified acrylic acid.
Spraying the coating composition on the surface of a rare earth permanent magnet with the thickness of 5mm to prepare a magnetic conductive expansion type coating with the thickness of 100 mu m; the rare earth permanent magnet is subjected to silanization treatment before spraying, and the silane treatment process comprises the following steps: the rare earth permanent magnet is immersed in a silane coupling agent for 5min and then dried at 90 ℃ for 30 min.
Example 3
A magnetic expansion type coating composition comprises the following components in parts by weight: epoxy resin E-2040%, expandable microsphere 9% (Acksu)
The particle size of the expanded microsphere is 9-15 mu m), the particle size of the 2-methylimidazole is 4%, the particle size of calcium carbonate is 18% (the particle size is 0.1-1 mu m), the content of simethicone is 0.8%, the anti-settling agent is 0.13%, the leveling agent is 0.35%, the content of the iron-based magnetic material is 7% (iron-nickel alloy powder, the particle size of the magnetic material is 1-20 mu m, the average particle size is 8 mu m), and the balance is ethanol;
the anti-settling agent is a mixture of polyethylene wax, polyamide wax slurry and ASD103 in a weight ratio of 3:1: 0.8;
the leveling agent is phosphate modified acrylic acid.
Spraying the coating composition on the surface of a rare earth permanent magnet with the thickness of 5mm to prepare a magnetic conductive expansion type coating with the coating thickness of 150 mu m; the rare earth permanent magnet is subjected to silanization treatment before spraying, and the silane treatment process comprises the following steps: the rare earth permanent magnet is immersed in a silane coupling agent for 5min and then dried at 90 ℃ for 30 min.
Example 4
A magnetic expansion type coating composition comprises the following components in parts by weight: epoxy resin E-2030%, expandable microspheres 7% (Acksu)
051DU40, the particle size of the expanded microsphere is 9-15 μm), 2-methylimidazole 7%, calcium carbonate 25% (particle size is 0.1 μm-1 μm), dimethyl silicon oil 1%, anti-settling agent 0.25%, leveling agent 0.15 percent of iron-based magnetic material, 2.5 percent of iron-nickel alloy powder (the grain diameter of the magnetic material is 1-20 mu m, the average grain diameter is 8 mu m), and the balance of ethanol;
the anti-settling agent is a mixture of polyethylene wax, polyamide wax slurry and ASD103 in a weight ratio of 3:1: 0.8;
the leveling agent is phosphate modified acrylic acid.
Spraying the coating composition on the surface of a rare earth permanent magnet with the thickness of 5mm to prepare a magnetic conductive expansion type coating with the thickness of 100 mu m; the rare earth permanent magnet is subjected to silanization treatment before spraying, and the silane treatment process comprises the following steps: the rare earth permanent magnet is immersed in a silane coupling agent for 5min and then dried at 90 ℃ for 30 min.
Comparative example 1
An intumescent coating comprises the following components in parts by weight: epoxy resin E-2040%, expandable microsphere 9% (Acksu)
051DU40 expanded microsphere with particle size of 9-15 μm), 2-methylimidazole 4%, calcium carbonate 18% (with particle size of 0.1 μm-1 μm), dimethyl silicone oil 0.8%, anti-settling agent 0.13%, leveling agent 0.35%, and the balance ethanol;
the anti-settling agent is a mixture of polyethylene wax, polyamide wax slurry and ASD103 in a weight ratio of 3:1: 0.8;
the leveling agent is phosphate modified acrylic acid.
Spraying the coating composition on the surface of a rare earth permanent magnet with the thickness of 5mm to prepare a magnetic conductive expansion type coating with the thickness of 100 mu m; the rare earth permanent magnet is subjected to silanization treatment before spraying, and the silane treatment process comprises the following steps: the rare earth permanent magnet is immersed in a silane coupling agent for 5min and then dried at 90 ℃ for 30 min.
The following table 1 shows the performance test results of the magnetic permeability expansion coatings prepared in examples 1 to 4 of the present invention and comparative example 1:
note: magnetic flux retention rate of expanded product magnetic flux/silanized product magnetic flux
Expansion ratio (coating thickness after expansion-coating thickness before expansion)/coating thickness before expansion
Shear force after expansion was tested according to GB/T7124-
Neutral Salt Spray (SST) was tested according to GB/T10125-
In the oil immersion experiment, the product is immersed in the automatic transmission oil at 150 ℃, and the product is observed to have the abnormalities of bubbling, rusting and the like after the immersion is finished.
From the results in table 1 it can be seen that:
1. comparing example 1 with comparative example 1 the results show that: the invention can lead the magnetic flux retention rate of the expanded product to be as high as 99.9 percent by adopting the magnetic conductive material, namely, the introduction of the magnetic conductive material basically eliminates the loss of the expansion type coating to the magnetic flux, and can lead the performances of the expansion rate, the shearing force and the like of the coating to be basically unchanged and lead the corrosion resistance of the coating to be improved.
2. The results of example 1 and example 2 show that: according to the invention, different types of epoxy resin and expanded microspheres are adopted, the dosage proportion is optimized, and the coating with excellent expansion rate, shearing force and corrosion resistance and higher magnetic flux retention rate can be prepared through the synergistic effect of the components.
3. The results from example 1 and example 3 show that: under the condition that the thickness of the expansion type coating is thick, the coating with high magnetic flux retention rate and excellent performances in all aspects can be prepared by adjusting the dosage of the magnetic permeability agent.
4. The results of comparative examples 1-4 show that: changing the dosage ratio of each component in the magnetic permeability intumescent coating composition can affect the performance (such as magnetic flux retention rate) of the expanded product. Therefore, by adjusting the dosage ratio of each component in the magnetic permeability intumescent coating composition, intumescent coatings with different properties can be prepared to meet different requirements.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A magnetically permeable intumescent coating composition, characterized in that said composition comprises the following components: epoxy resin, expandable microspheres, a curing agent, an additive, a defoaming agent, an anti-settling agent, a leveling agent, a magnetic conductive agent and a solvent.
2. The composition of claim 1, wherein the weight percent of epoxy resin in the composition is 30-60%.
Preferably, the expandable microspheres are present in the composition in an amount of 5-15% by weight.
Preferably, the weight percentage of the curing agent in the composition is 2-10%.
Preferably, the weight percentage of the additive in the composition is 10-25%.
Preferably, the weight percentage of antifoam in the composition is from 0.5 to 1%.
Preferably, the weight percentage of the anti-settling agent in the composition is 0.05-0.3%.
Preferably, the weight percentage of the leveling agent in the composition is 0.1-0.5%.
Preferably, the weight percentage of the magnetic permeability agent in the composition is 1-10%.
Preferably, a solvent is also included in the composition.
Preferably, the sum of the weight percentages of the components in the composition is 100%.
3. The composition of claim 1 or 2, wherein the epoxy resin is a bisphenol a type epoxy resin; the bisphenol A type epoxy resin with the softening point of 50-95 ℃ is preferred.
Preferably, the expandable microspheres have a diameter of 9-50 μm.
Preferably, the curing agent includes, but is not limited to, one, two or more of imidazole, an epoxy resin adduct of imidazole, or an epoxy resin adduct of polyamine.
Preferably, the additive is one, two or more of talc, calcium carbonate, barium sulfate and carbon black.
Preferably, the defoaming agent can be one or more of polysiloxane defoaming agent, tributyl phosphate and polyether modified silicon and/or a solution containing the substances.
Preferably, the anti-settling agent comprises polyethylene wax, polyamide wax slurry and ASD 103.
Preferably, the weight ratio of the polyethylene wax, the polyamide wax slurry and the ASD103 is 3 (0.8-1.2) to (0.5-1.0).
Preferably, the leveling agent may be one, two or more of an acrylic leveling agent, an organic silicon leveling agent and a modified acrylic leveling agent.
Preferably, the magnetic permeability agent comprises one, two or more of powders of magnetic elementary substance such as Fe, Co, Ni and the like or magnetic compound thereof, soft magnetic powder of FeNi alloy and the like.
Preferably, the particle size of the magnetic permeability agent is 1-50 μm.
Preferably, the solvent can be at least one of dichloroethane, acetone, toluene, xylene, ethanol, benzyl alcohol and phenol.
4. Use of the intumescent coating composition of any of claims 1 to 3 for the preparation of a magnetic material surface permeability intumescent coating.
5. Intumescent coating of magnetic permeability on the surface of a magnetic material, characterized in that it is prepared from an intumescent coating composition according to any of claims 1 to 3.
6. The magnetically permeable intumescent coating of claim 5, wherein the thickness of the magnetically permeable intumescent coating before expansion is 20-300 μ ι η.
Preferably, the magnetic permeability expansion coating has an expansion rate of 50-300%.
Preferably, the shearing force of the magnetic permeability expansion coating is 1-10 MPa.
Preferably, the oil resistance of the magnetic permeability expansion coating is more than 2000 h.
Preferably, the neutral salt fog of the magnetic conductive expansion coating is more than 260 h.
7. The process for the preparation of a magnetically permeable intumescent coating according to claim 5 or 6, wherein the process comprises applying the intumescent coating composition according to any of claims 1 to 3 to a substrate surface to form a magnetically permeable intumescent coating.
8. The method of claim 7, further comprising the step of pre-treating the substrate. For example, the pretreatment may be a treatment such as phosphating and/or passivation and/or vitrification and/or silylation and/or chelation.
9. The method according to claim 8, wherein the pretreatment is carried out for 1 to 20 min.
Preferably, the preparation method further comprises drying the pretreated substrate.
Preferably, the drying temperature is 40-200 ℃, and the drying time is 5-90 min.
Preferably, the coating means may be at least one of dip coating, blade coating, brush coating, spray coating, and the like.
10. Use of a magnetically permeable intumescent coating according to claim 5 or 6 and/or a magnetically permeable intumescent coating produced according to the production method of any of claims 7 to 9 for corrosion protection; preferably in the use of magnetic materials against electrochemical corrosion.
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