CN114015329B - Corrosion-resistant neodymium-iron-boron magnet and preparation method thereof - Google Patents
Corrosion-resistant neodymium-iron-boron magnet and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of magnets, in particular to a corrosion-resistant neodymium iron boron magnet and a preparation method thereof. The corrosion-resistant neodymium iron boron magnet comprises a neodymium iron boron magnet base body and a corrosion-resistant protective coating coated on the outer surface of the magnet base body; the corrosion-resistant protective coating comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 90-100 parts of bisphenol A epoxy resin, 12-20 parts of phenolic resin, 10-16 parts of acrylic resin, 5-9 parts of polytetrafluoroethylene, 14-20 parts of inorganic filler, 14-20 parts of functional assistant, 5-10 parts of hydroxyethyl cellulose, 4-8 parts of styrene-acrylic emulsion, 14-20 parts of zinc powder, 1-4 parts of silane coupling agent and 45-60 parts of solvent. The corrosion-resistant protective coating can obviously improve the corrosion resistance of the magnet matrix, and prolong the service life and the application range of the magnet matrix; the preparation method of the corrosion-resistant neodymium iron boron magnet is simple in process, convenient to operate and control, high in production efficiency, beneficial to industrial production, stable in quality of the prepared product and excellent in comprehensive performance.
Description
Technical Field
The invention relates to the technical field of magnets, in particular to a corrosion-resistant neodymium iron boron magnet and a preparation method thereof.
Background
The neodymium iron boron magnet is a magnet which is found to have the highest commercialization performance at present, has the characteristics of small volume, light weight and strong magnetism, has higher performance price, is extremely widely applied, can be used in the fields of electronics, electric machinery, medical instruments, toys, packaging, hardware machinery, aerospace and the like, and is more commonly provided with a permanent magnet motor, a loudspeaker, a magnetic separator, a computer disk driver, a magnetic resonance imaging device instrument and the like. With the development of science and technology and the progress of society, the performance requirements of people on the neodymium iron boron magnet are higher and higher, however, the existing neodymium iron boron magnet has poor corrosion resistance, cannot meet the requirements in some occasions and fields, and limits the use of the neodymium iron boron magnet.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide the corrosion-resistant neodymium iron boron magnet and the preparation method thereof, wherein the corrosion-resistant neodymium iron boron magnet is coated with the corrosion-resistant protective coating on the outer surface of the magnet base body, so that the corrosion resistance of the magnet base body can be effectively improved, and the service life of the magnet base body is prolonged; the preparation method of the corrosion-resistant neodymium iron boron magnet is simple in process, convenient to operate and control, high in production efficiency, beneficial to industrial production, stable in quality of the prepared product and excellent in comprehensive performance.
The purpose of the invention is realized by the following technical scheme: the corrosion-resistant neodymium iron boron magnet comprises a neodymium iron boron magnet base body and a corrosion-resistant protective coating coated on the outer surface of the magnet base body; the corrosion-resistant protective coating is prepared from a corrosion-resistant protective coating, wherein the corrosion-resistant protective coating comprises a component A and a component B, and the component A comprises the following raw materials in parts by weight: 90-100 parts of bisphenol A epoxy resin, 12-20 parts of phenolic resin, 10-16 parts of acrylic resin, 5-9 parts of polytetrafluoroethylene, 14-20 parts of inorganic filler, 14-20 parts of functional assistant, 5-10 parts of hydroxyethyl cellulose, 4-8 parts of styrene-acrylic emulsion, 14-20 parts of zinc powder, 1-4 parts of silane coupling agent and 45-60 parts of solvent.
Further, the component B comprises the following raw materials in parts by weight: 2-5 parts of curing agent and 5-8 parts of diluent.
According to the corrosion-resistant neodymium iron boron magnet, the corrosion-resistant protective coating is coated on the outer surface of the magnet substrate, so that the corrosion resistance of the magnet is improved, and the service life of the magnet is prolonged. The corrosion-resistant protective coating adopted by the corrosion-resistant protective coating comprises a component A and a component B, wherein the component A and the component B can be separately placed and stored before use, and the component A and the component B are mixed when in use; the component A is prepared by compounding bisphenol A type epoxy resin, phenolic resin and acrylic resin, and is matched with polytetrafluoroethylene, a functional auxiliary agent, hydroxyethyl cellulose, styrene-acrylic emulsion, zinc powder, a silane coupling agent and other raw materials, and inorganic filler is added into a coating system, so that the raw materials can be mutually benefited, good matching is realized, the prepared corrosion-resistant protective coating can be tightly coated on the surface of a magnet substrate to form a uniform and smooth coating, the coating has strong adhesive force with the magnet substrate and is not easy to fall off, the prepared neodymium iron boron magnet has excellent corrosion resistance and long service life, and the appearance of the magnet is favorably improved. The bisphenol A type epoxy resin is preferably, but not limited to, a bisphenol A type epoxy resin (E-03 type). The phenolic resin may be p-tert-octylphenol formaldehyde resin, but is not limited to phenolic resin SP-1068. The acrylic resin is preferably, but not limited to, acrylic resin Mitsubishi BR 113. The polytetrafluoroethylene is Komu Teflon 650 XTX. The styrene-acrylic emulsion is styrene-acrylic emulsion Badfei RS-5969.
Further, the silane coupling agent is at least one of a silane coupling agent KH-550, a silane coupling agent KH-560 and a silane coupling agent KH-792. The silane coupling agent is adopted, so that the mechanical property of the coating and the bonding strength of the coating and the magnet substrate are improved.
Further, the inorganic filler is at least one of nano calcium carbonate, nano silicon dioxide and nano talcum powder. The particle size of the inorganic filler is 30-70 nm. Preferably, the inorganic filler is prepared from nano calcium carbonate, nano silicon dioxide and nano talcum powder according to the weight ratio of 1-2: 1-2: 1. By adopting the inorganic filler, the corrosion resistance and the mechanical property of the corrosion-resistant protective coating can be improved, the proportion of bisphenol A epoxy resin, phenolic resin and the like can be reduced, the cost is reduced, and the dimensional stability is improved.
Further, the preparation method of the functional auxiliary agent comprises the following steps: mixing 8-12 parts of graphene, 5-10 parts of isobutylene-maleic anhydride copolymer, 5-10 parts of vinyl bis stearamide, 4-8 parts of isobutyl triethoxysilane and 10-15 parts of polyethylene glycol in parts by weight, uniformly stirring at 85-95 ℃, and keeping the temperature for 45-90 min; obtaining the functional additive. According to the invention, graphene, isobutylene-maleic anhydride copolymer, vinyl bis-stearamide, isobutyl triethoxysilane and other raw materials are compounded and added into a coating system, so that the graphene, the isobutylene-maleic anhydride copolymer, the vinyl bis-stearamide, the isobutyl triethoxysilane and other raw materials are well matched with bisphenol A epoxy resin, phenolic resin, acrylic resin and the like, and the corrosion resistance and the mechanical property of the coating and the bonding strength of the coating and a magnet substrate are improved. The isobutylene-maleic anhydride copolymer is preferably, but not necessarily, isobutylene-maleic anhydride copolymer ISOBAM-600.
Further, the curing agent is at least one of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine and diethylaminopropylamine. The curing agent can be used for crosslinking and curing the epoxy resin with the ring to form a reticular three-dimensional polymer, so that the corrosion resistance and the mechanical property of the coating are improved, the coating is not easy to fall off from the magnet matrix, and the combination is tight.
Further, the diluent is at least one of ethanol, ethyl acetate and acetone.
Further, the solvent is at least one of acetone, xylene and n-butanol.
Further, the preparation method of the corrosion-resistant protective coating comprises the following steps:
the preparation method of the component A comprises the following steps:
a1, uniformly mixing the functional assistant, the silane coupling agent and the solvent according to the parts by weight, then adding the bisphenol A epoxy resin, the phenolic resin, the acrylic resin, the hydroxyethyl cellulose and the polytetrafluoroethylene, and stirring at the temperature of 70-80 ℃ for 20-30min to obtain a mixture A1;
a2, adding inorganic filler, styrene-acrylic emulsion and zinc powder into the mixture A, and stirring at 70-80 ℃ for 20-30min to obtain a mixture A2; grinding and filtering the mixture B to obtain filtrate, namely the component A.
The preparation method of the component B comprises the following steps: and mixing the curing agent and the diluent, and uniformly stirring to obtain the component B.
The preparation method of the corrosion-resistant protective coating respectively prepares the component A and the component B, the component A and the component B can be separately placed and stored before use, and the component A and the component B are mixed when in use; the corrosion-resistant protective coating prepared by the preparation method can be uniformly coated on the outer surface of the magnet substrate, a uniform and stable coating with smooth appearance is formed on the surface of the magnet, and the binding force between the coating and the magnet substrate is strong.
The invention also provides a preparation method of the corrosion-resistant neodymium iron boron magnet, which comprises the following steps:
s1, placing the magnet substrate in the corrosion-resistant protective coating for dipping, then pulling the magnet substrate upwards, separating the magnet substrate from the corrosion-resistant protective coating and suspending the magnet substrate above the corrosion-resistant protective coating; repeating the steps of dipping and pulling to obtain a magnet matrix coated with a primary coating;
and S2, curing the primary coating film of the magnet substrate to obtain the corrosion-resistant neodymium iron boron magnet coated with the corrosion-resistant protective coating.
Further, in the step S1, the dipping time is 30 to 40 seconds each time, the time for separating the magnet base body from the corrosion-resistant protective coating and suspending the magnet base body after each pulling is 60 to 90 seconds, and the repetition times are 20 to 30 times.
Further, in the step S2, the curing temperature of the primary coating film is 80 to 90 ℃, and the curing time is 25 to 35 min.
According to the invention, by adopting the steps and controlling the technological parameters of the steps, the corrosion-resistant protective coating is tightly coated on the outer surface of the corrosion-resistant neodymium iron boron magnet to form a uniform, stable, flat and smooth coating, the coating has strong adhesive force with the magnet substrate and is not easy to fall off, so that the prepared neodymium iron boron magnet has excellent corrosion resistance and long service life, and the appearance of the magnet is favorably improved.
The invention has the beneficial effects that: according to the corrosion-resistant neodymium iron boron magnet, the corrosion resistance of the magnet substrate can be obviously improved by coating the corrosion-resistant protective coating on the outer surface of the magnet substrate, so that the service life and the application range of the magnet substrate are prolonged; the preparation method of the corrosion-resistant neodymium iron boron magnet is simple in process, convenient to operate and control, high in production efficiency, beneficial to industrial production, stable in quality of the prepared product and excellent in comprehensive performance.
Detailed Description
The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.
Example 1
In the embodiment, the corrosion-resistant neodymium iron boron magnet comprises a neodymium iron boron magnet base body and a corrosion-resistant protective coating covering the outer surface of the magnet base body; the corrosion-resistant protective coating is prepared from a corrosion-resistant protective coating, wherein the corrosion-resistant protective coating comprises a component A and a component B, and the component A comprises the following raw materials in parts by weight: 95 parts of bisphenol A epoxy resin, 16 parts of phenolic resin, 13 parts of acrylic resin, 7 parts of polytetrafluoroethylene, 16 parts of inorganic filler, 17 parts of functional assistant, 8 parts of hydroxyethyl cellulose, 6 parts of styrene-acrylic emulsion, 16 parts of zinc powder, 2 parts of silane coupling agent and 50 parts of solvent; the component B comprises the following raw materials in parts by weight: 3 parts of curing agent and 7 parts of diluent. The bisphenol A type epoxy resin is bisphenol A type epoxy resin (E-03 type). The phenolic resin is phenolic resin SP-1068. The acrylic resin is acrylic resin Mitsubishi BR 113. The polytetrafluoroethylene is Komu Teflon 650 XTX. The styrene-acrylic emulsion is styrene-acrylic emulsion Badfei RS-5969.
Further, the silane coupling agent consists of a silane coupling agent KH-550 and a silane coupling agent KH-792 according to a weight ratio of 2: 1. The particle size of the inorganic filler is 30-70 nm. The inorganic filler is prepared from nano calcium carbonate, nano silicon dioxide and nano talcum powder according to the weight ratio of 2: 1: 1.
Further, the preparation method of the functional auxiliary agent comprises the following steps: mixing 10 parts of graphene, 7 parts of isobutylene-maleic anhydride copolymer, 7 parts of vinyl bis stearamide, 6 parts of isobutyl triethoxysilane and 12 parts of polyethylene glycol in parts by weight, uniformly stirring at 90 ℃, and keeping the temperature for 60 min; obtaining the functional additive. The isobutylene-maleic anhydride copolymer is isobutylene-maleic anhydride copolymer ISOBAM-600.
Further, the curing agent is diethylenetriamine. The diluent consists of ethanol, ethyl acetate and acetone according to the weight ratio of 1:1: 2. The solvent is composed of acetone and n-butanol according to the weight ratio of 1: 2.
Further, the preparation method of the corrosion-resistant protective coating comprises the following steps:
the preparation method of the component A comprises the following steps:
a1, uniformly mixing the functional additive, the silane coupling agent and the solvent according to the parts by weight, then adding the bisphenol A type epoxy resin, the phenolic resin, the acrylic resin, the hydroxyethyl cellulose and the polytetrafluoroethylene, and stirring for 25min at the temperature of 75 ℃ to obtain a mixture A1;
a2, adding an inorganic filler, a styrene-acrylic emulsion and zinc powder into the mixture A, and stirring at 75 ℃ for 25min to obtain a mixture A2; grinding and filtering the mixture B to obtain a filtrate, namely a component A;
the preparation method of the component B comprises the following steps: and mixing the curing agent and the diluent, and uniformly stirring to obtain the component B.
The preparation method of the corrosion-resistant neodymium iron boron magnet comprises the following steps:
s1, placing the magnet substrate in the corrosion-resistant protective coating for dipping, then pulling the magnet substrate upwards, separating the magnet substrate from the corrosion-resistant protective coating and suspending the magnet substrate above the corrosion-resistant protective coating; repeating the steps of dipping and pulling to obtain a magnet matrix coated with a primary coating;
and S2, curing the primary coating film of the magnet substrate to obtain the corrosion-resistant neodymium iron boron magnet coated with the corrosion-resistant protective coating.
Further, in the step S1, the dipping time is 5S each time, the time for detaching the magnet base from the corrosion-resistant protective coating and suspending the magnet base after each pulling is 80S, and the number of times of repetition is 25. In the step S2, the curing temperature of the primary coating film was 85 ℃ and the curing time was 30 min.
Example 2
In this embodiment, the corrosion-resistant ndfeb magnet includes a ndfeb magnet substrate and a corrosion-resistant protective coating covering the outer surface of the magnet substrate; the corrosion-resistant protective coating is prepared from a corrosion-resistant protective coating, wherein the corrosion-resistant protective coating comprises a component A and a component B, and the component A comprises the following raw materials in parts by weight: 90 parts of bisphenol A type epoxy resin, 12 parts of phenolic resin, 10 parts of acrylic resin, 5 parts of polytetrafluoroethylene, 14 parts of inorganic filler, 14 parts of functional assistant, 5 parts of hydroxyethyl cellulose, 4 parts of styrene-acrylic emulsion, 14 parts of zinc powder, 1 part of silane coupling agent and 45 parts of solvent; the component B comprises the following raw materials in parts by weight: 2 parts of curing agent and 5 parts of diluent.
Further, the silane coupling agent consists of a silane coupling agent KH-550 and a silane coupling agent KH-560 according to a weight ratio of 2: 1. The inorganic filler is prepared from nano calcium carbonate, nano silicon dioxide and nano talcum powder according to the weight ratio of 1: 2: 1.
Further, the preparation method of the functional auxiliary agent comprises the following steps: mixing 8 parts of graphene, 5 parts of isobutylene-maleic anhydride copolymer, 5 parts of vinyl bis stearamide, 4 parts of isobutyl triethoxysilane and 10 parts of polyethylene glycol in parts by weight, uniformly stirring at 85 ℃, and keeping the temperature for 90 min; obtaining the functional additive.
Further, the curing agent is ethylene diamine and triethylene tetramine according to the weight ratio of 1: 1. The diluent is ethanol, ethyl acetate and acetone according to a weight ratio of 1:1: 3, and (3). The solvent consists of acetone and xylene according to a weight ratio of 2: 1.
Further, the preparation method of the corrosion-resistant protective coating comprises the following steps:
the preparation method of the component A comprises the following steps:
a1, uniformly mixing the functional additive, the silane coupling agent and the solvent according to the parts by weight, then adding the bisphenol A type epoxy resin, the phenolic resin, the acrylic resin, the hydroxyethyl cellulose and the polytetrafluoroethylene, and stirring for 30min at the temperature of 70 ℃ to obtain a mixture A1;
a2, adding an inorganic filler, a styrene-acrylic emulsion and zinc powder into the mixture A, and stirring at 70 ℃ for 30min to obtain a mixture A2; grinding and filtering the mixture B to obtain a filtrate, namely a component A;
the preparation method of the component B comprises the following steps: and mixing the curing agent and the diluent, and uniformly stirring to obtain the component B.
The invention also provides a preparation method of the corrosion-resistant neodymium iron boron magnet, which comprises the following steps:
s1, dipping the magnet substrate in the corrosion-resistant protective coating, then lifting the magnet substrate upwards, separating the magnet substrate from the corrosion-resistant protective coating and suspending the magnet substrate above the corrosion-resistant protective coating; repeating the steps of dipping and pulling to obtain a magnet matrix coated with a primary coating;
and S2, curing the primary coating film of the magnet substrate to obtain the corrosion-resistant neodymium iron boron magnet coated with the corrosion-resistant protective coating.
Further, in step S1, the dipping time is 30S each time, the time for which the magnet substrate is separated from the corrosion-resistant protective coating and suspended after each pulling is 90S, and the number of times of the above-mentioned steps is 30. In the step S2, the curing temperature of the primary coating film is 80 ℃ and the curing time is 35 min.
The rest of this embodiment is similar to embodiment 1, and is not described herein again.
Example 3
In this embodiment, the corrosion-resistant ndfeb magnet includes a ndfeb magnet substrate and a corrosion-resistant protective coating covering the outer surface of the magnet substrate; the corrosion-resistant protective coating is prepared from a corrosion-resistant protective coating, wherein the corrosion-resistant protective coating comprises a component A and a component B, and the component A comprises the following raw materials in parts by weight: 100 parts of bisphenol A epoxy resin, 20 parts of phenolic resin, 16 parts of acrylic resin, 9 parts of polytetrafluoroethylene, 20 parts of inorganic filler, 20 parts of functional assistant, 10 parts of hydroxyethyl cellulose, 8 parts of styrene-acrylic emulsion, 20 parts of zinc powder, 4 parts of silane coupling agent and 60 parts of solvent; the component B comprises the following raw materials in parts by weight: 5 parts of curing agent and 8 parts of diluent.
Further, the preparation method of the functional auxiliary agent comprises the following steps: mixing 12 parts of graphene, 10 parts of isobutylene-maleic anhydride copolymer, 10 parts of vinyl bis-stearamide, 8 parts of isobutyl triethoxysilane and 15 parts of polyethylene glycol in parts by weight, uniformly stirring at 95 ℃, and keeping the temperature for 45 min; obtaining the functional additive.
Further, the preparation method of the corrosion-resistant protective coating comprises the following steps:
the preparation method of the component A comprises the following steps:
a1, uniformly mixing the functional additive, the silane coupling agent and the solvent according to the parts by weight, then adding the bisphenol A type epoxy resin, the phenolic resin, the acrylic resin, the hydroxyethyl cellulose and the polytetrafluoroethylene, and stirring for 20min at the temperature of 80 ℃ to obtain a mixture A1;
a2, adding an inorganic filler, a styrene-acrylic emulsion and zinc powder into the mixture A, and stirring at 80 ℃ for 20min to obtain a mixture A2; grinding and filtering the mixture B to obtain a filtrate, namely a component A;
the preparation method of the component B comprises the following steps: and mixing the curing agent and the diluent, and uniformly stirring to obtain the component B.
The invention also provides a preparation method of the corrosion-resistant neodymium iron boron magnet, which comprises the following steps:
s1, placing the magnet substrate in the corrosion-resistant protective coating for dipping, then pulling the magnet substrate upwards, separating the magnet substrate from the corrosion-resistant protective coating and suspending the magnet substrate above the corrosion-resistant protective coating; repeating the steps of dipping and pulling to obtain a magnet matrix coated with a primary coating;
and S2, curing the primary coating film of the magnet substrate to obtain the corrosion-resistant neodymium iron boron magnet coated with the corrosion-resistant protective coating.
Further, in the step S1, the dipping time is 40S each time, the time for separating the magnet base body from the corrosion-resistant protective coating and suspending the magnet base body after each pulling is 60S, and the repetition times are 30 times. In the step S2, the curing temperature of the primary coating film is 90 ℃ and the curing time is 25 min.
The rest of this embodiment is similar to embodiment 1, and is not described herein again.
Example 4
In this embodiment, the corrosion-resistant ndfeb magnet includes a ndfeb magnet substrate and a corrosion-resistant protective coating covering the outer surface of the magnet substrate; the corrosion-resistant protective coating is prepared from a corrosion-resistant protective coating, wherein the corrosion-resistant protective coating comprises a component A and a component B, and the component A comprises the following raw materials in parts by weight: 95 parts of bisphenol A epoxy resin, 15 parts of phenolic resin, 12 parts of acrylic resin, 6 parts of polytetrafluoroethylene, 16 parts of inorganic filler, 15 parts of functional assistant, 6 parts of hydroxyethyl cellulose, 5 parts of styrene-acrylic emulsion, 16 parts of zinc powder, 3 parts of silane coupling agent and 55 parts of solvent; the component B comprises the following raw materials in parts by weight: 4 parts of curing agent and 7 parts of diluent.
Further, the preparation method of the functional auxiliary agent comprises the following steps: mixing 10 parts by weight of graphene, 6 parts by weight of isobutylene-maleic anhydride copolymer, 7 parts by weight of vinyl bis stearamide, 5 parts by weight of isobutyl triethoxysilane and 12 parts by weight of polyethylene glycol, uniformly keeping the temperature at 90 ℃ for 60 min; obtaining the functional additive.
The rest of this embodiment is similar to embodiment 1, and is not described herein again.
Comparative example 1
The comparative example differs from example 1 in that: the corrosion-resistant protective paint of the comparative example does not contain a functional additive, the functional additive is replaced by a mixture of epoxy resin, acrylic resin and phenolic resin with the same amount, and the weight ratio of the epoxy resin, the acrylic resin and the phenolic resin in the comparative example is the same as that in example 1. The rest of this embodiment is similar to embodiment 1, and is not described herein again.
Comparative example 2
The comparative example differs from example 1 in that: the corrosion-resistant protective coating of the comparative example does not contain styrene-acrylic emulsion, hydroxyethyl cellulose and polytetrafluoroethylene, the styrene-acrylic emulsion, the hydroxyethyl cellulose and the polytetrafluoroethylene are replaced by the mixture of epoxy resin, acrylic resin and phenolic resin with the same amount, and the weight ratio of the epoxy resin, the acrylic resin and the phenolic resin in the comparative example is the same as that in example 1. The rest of this embodiment is similar to embodiment 1, and is not described herein again.
The corrosion-resistant neodymium iron boron magnet prepared in examples 1 to 4 and comparative examples 1 to 2 was coated to a thickness of 30 ± 3 μm, and a performance test was performed. Wherein the salt spray resistance is GB/T1771-2007; water resistance according to GB/T1771-1993; acid and alkali resistance according to GB/T9274-1988; the humidity resistance is in accordance with GB/T1740-2007; flash rust inhibition test the test performance was determined according to HG/T4759-2014, with the following results:
flash rust inhibition test: examples 1 to 4 and comparative examples 1 to 2 were normal. Water resistance test (500 h): examples 1-4 and comparative examples 1-2 did not blister, flake, rust, or crack. Salt spray resistance test (500 h): examples 1-4 and comparative example 2 did not blister, flake, rust, crack; comparative example 1 was slightly peeled off and rusted. Acid resistance test (48H, 50g/L, H)2SO4): examples 1 to 4 all haveAn anomaly; comparative examples 1-2 were slightly peeled off and slightly rusted. Alkali resistance test (240h,50g/L, NaOH): examples 1-4 were all free of abnormalities; comparative examples 1-2 all foamed. Test for Wet Heat resistance (240 h): examples 1 to 4 did not blister, did not peel off, did not rust, did not crack, the bubble density of comparative example 1 was very low, several bubbles, and the bubble density of comparative example 2 was low with a few bubbles, slightly peeled off.
The impact resistance, the grid test and the comprehensive aging performance test of the protective coating were carried out on examples 1 to 4 and comparative examples 1 to 2, and the test results are as follows:
wherein the impact resistance is in accordance with GB/T1732-1993, and the impact resistance test takes 5cm as an interval. The lattice test is according to GB/T9286-1998; the rating method for coating ageing is according to GB/T1766-2008. According to the corrosion-resistant neodymium iron boron magnet, the corrosion resistance of the magnet base body can be effectively improved, the service life of the magnet base body is prolonged, and the application range of the magnet base body is widened by coating the corrosion-resistant protective coating on the outer surface of the magnet base body; the preparation method of the corrosion-resistant neodymium iron boron magnet is simple in process, convenient to operate and control, high in production efficiency, beneficial to industrial production, stable in quality of the prepared product and excellent in comprehensive performance.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (10)
1. The utility model provides a corrosion-resistant neodymium iron boron magnet which characterized in that: comprises a neodymium iron boron magnet base body and a corrosion-resistant protective coating coated on the outer surface of the magnet base body;
the corrosion-resistant protective coating is prepared from a corrosion-resistant protective coating, wherein the corrosion-resistant protective coating comprises a component A and a component B, and the component A comprises the following raw materials in parts by weight: 90-100 parts of bisphenol A epoxy resin, 12-20 parts of phenolic resin, 10-16 parts of acrylic resin, 5-9 parts of polytetrafluoroethylene, 14-20 parts of inorganic filler, 14-20 parts of functional assistant, 5-10 parts of hydroxyethyl cellulose, 4-8 parts of styrene-acrylic emulsion, 14-20 parts of zinc powder, 1-4 parts of silane coupling agent and 45-60 parts of solvent;
the preparation method of the functional auxiliary agent comprises the following steps: mixing 8-12 parts of graphene, 5-10 parts of isobutylene-maleic anhydride copolymer, 5-10 parts of vinyl bis stearamide, 4-8 parts of isobutyl triethoxysilane and 10-15 parts of polyethylene glycol in parts by weight, uniformly stirring at the temperature of 85-95 ℃, and preserving heat for 45-90min to obtain the functional auxiliary agent.
2. The corrosion-resistant neodymium-iron-boron magnet according to claim 1, wherein: the component B comprises the following raw materials in parts by weight: 2-5 parts of curing agent and 5-8 parts of diluent.
3. The corrosion-resistant neodymium-iron-boron magnet according to claim 2, wherein: the silane coupling agent is at least one of a silane coupling agent KH-550, a silane coupling agent KH-560 and a silane coupling agent KH-792.
4. The corrosion-resistant neodymium-iron-boron magnet according to claim 2, wherein: the inorganic filler is at least one of nano calcium carbonate, nano silicon dioxide and nano talcum powder.
5. The corrosion-resistant neodymium-iron-boron magnet according to claim 2, wherein: the curing agent is at least one of ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylene tetramine and diethylaminopropylamine.
6. The corrosion-resistant neodymium-iron-boron magnet according to claim 2, wherein: the diluent is at least one of ethanol, ethyl acetate and acetone.
7. The corrosion-resistant neodymium-iron-boron magnet according to claim 2, wherein: the preparation method of the corrosion-resistant protective coating comprises the following steps:
the preparation method of the component A comprises the following steps:
a1, uniformly mixing the functional additive, the silane coupling agent and the solvent according to the parts by weight, then adding the bisphenol A type epoxy resin, the phenolic resin, the acrylic resin, the hydroxyethyl cellulose and the polytetrafluoroethylene, and stirring for 20-30min at the temperature of 70-80 ℃ to obtain a mixture A1;
a2, adding inorganic filler, styrene-acrylic emulsion and zinc powder into the mixture A1, and stirring at 70-80 ℃ for 20-30min to obtain a mixture A2; grinding and filtering the mixture A2 to obtain a filtrate A component for later use.
8. The corrosion-resistant neodymium-iron-boron magnet according to claim 7, wherein: the preparation method of the component B comprises the following steps: and mixing the curing agent and the diluent, and uniformly stirring to obtain the component B.
9. A method for preparing a corrosion-resistant neodymium-iron-boron magnet according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:
s1, placing the magnet substrate in the corrosion-resistant protective coating for dipping, then pulling the magnet substrate upwards, separating the magnet substrate from the corrosion-resistant protective coating and suspending the magnet substrate above the corrosion-resistant protective coating; repeating the steps of dipping and pulling to obtain a magnet matrix coated with a primary coating;
and S2, curing the primary coating film of the magnet substrate to obtain the corrosion-resistant neodymium iron boron magnet coated with the corrosion-resistant protective coating.
10. The method for preparing a corrosion-resistant neodymium-iron-boron magnet according to claim 9, characterized in that: in the step S2, the curing temperature of the primary coating is 80-90 ℃, and the curing time is 25-35 min.
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