阅读说明：本技术 一种抗震耐腐蚀型粘结钕铁硼磁体及其制备方法 (Shock-resistant corrosion-resistant bonded neodymium iron boron magnet and preparation method thereof ) 是由 关传海 杨友文 潘勤 关世昊 张恩华 陈雪奇 李如福 高洁 韩谋智 于 2021-06-30 设计创作，主要内容包括：本发明提供了一种抗震耐腐蚀型粘结钕铁硼磁体及其制备方法,属于粘结钕铁硼磁体技术领域,用于解决现有粘结钕铁硼磁体生产效率低、耐腐蚀型抗震防摔效果差的问题。包括底座壳体和上盖板,底座壳体内部设有放置区,放置区内部设有磁体,放置区的内外侧均设有外边槽和内边槽,磁体与外边槽及内边槽之间分别形成卡接环形区,上盖板的下端设有外插环和内插环,外插环和内插环插合在对应的卡接环形区内部,磁体包括磁体主体,磁体主体的表面由内向外依次设有电镀磷层、耐腐蚀涂层和气相沉积膜层；本发明原料配比科学合理,强度高,磁性好,电镀磷层、耐腐蚀涂层和气相沉积膜层包覆在磁体主体表面,耐腐蚀；底座壳体和上盖板配合包裹磁体,抗摔抗震。(The invention provides an anti-seismic corrosion-resistant bonded neodymium iron boron magnet and a preparation method thereof, belongs to the technical field of bonded neodymium iron boron magnets, and is used for solving the problems of low production efficiency and poor anti-seismic and anti-falling effects of the existing bonded neodymium iron boron magnet. The magnetic field generator comprises a base shell and an upper cover plate, wherein a placing area is arranged in the base shell, a magnet is arranged in the placing area, an outer side groove and an inner side groove are arranged on the inner side and the outer side of the placing area, clamping annular areas are formed between the magnet and the outer side groove and between the magnet and the inner side groove respectively, an outer inserting ring and an inner inserting ring are arranged at the lower end of the upper cover plate, the outer inserting ring and the inner inserting ring are inserted into the corresponding clamping annular areas, the magnet comprises a magnet body, and an electroplating phosphorus layer, a corrosion-resistant coating and a gas-phase deposition film layer are sequentially arranged on the surface of the magnet body from inside to outside; the invention has scientific and reasonable raw material proportion, high strength and good magnetism, and the electroplating phosphorus layer, the corrosion-resistant coating and the gas-phase deposition film layer are coated on the surface of the magnet body and are corrosion-resistant; the magnet is wrapped up in the cooperation of base casing and upper cover plate, and anti falling is combatted earthquake.)

1. The utility model provides an antidetonation corrosion resistant type bonding neodymium iron boron magnet, including base casing (1) and upper cover plate (3), a serial communication port, base casing (1) inside is equipped with places district (1c), place district (1c) inside and be equipped with magnet (2), the inside and outside side of placing district (1c) all is equipped with outside groove (1a) and inside groove (1b), form the joint annular region between magnet (2) and outside groove (1a) and inside groove (1b) respectively, the lower extreme of upper cover plate (3) is equipped with outer insert ring (3a) and interior insert ring (3b), outer insert ring (3a) and interior insert ring (3b) are inserted and are closed inside the joint annular region that corresponds, magnet (2) include magnet main part (2a), the surface of magnet main part (2a) is equipped with electroplate phosphor layer (2b), corrosion resistant coating (2c) and gaseous phase deposit rete (2d) from inside to outside in proper order, the magnet main body (2a) is prepared from the following component raw materials in parts by weight: 94-96 parts of neodymium iron boron magnetic powder, 1.5-2 parts of thermosetting binder, 0.2-0.6 part of coupling agent, 0.1-0.5 part of lubricant, 0.1-0.5 part of curing agent, 0.1-1.5 parts of accelerator and 0.1-1 part of reinforcing agent; the thickness of the electroplating phosphorus layer is 6-18 mu m, and the corrosion-resistant coating (2c) is prepared from the following raw materials in parts by weight: 75-85 parts of aluminum, 8-20 parts of copper, 1-2 parts of rare earth and 0.1-0.5 part of bismuth, wherein the vapor deposition film layer (2d) is an aluminum film, a chromium film, a titanium oxide film or a parylene film, and the thickness of the vapor deposition film layer 4 is 5-18 mu m.

2. An anti-seismic corrosion-resistant type bonded neodymium iron boron magnet according to claim 1, characterized in that the magnet main body (2a) is made of the following component raw materials in parts by weight: 94.5-95.5 parts of neodymium iron boron magnetic powder, 1.6-1.8 parts of thermosetting binder, 0.3-0.5 part of coupling agent, 0.2-0.4 part of lubricant, 0.2-0.4 part of curing agent, 0.2-1.3 parts of accelerator, 0.2-0.8 part of reinforcing agent, and the corrosion-resistant coating 2c is prepared from the following component raw materials in parts by weight: 75-85 parts of aluminum, 8-20 parts of copper, 1-2 parts of rare earth and 0.1-0.5 part of bismuth.

3. An anti-seismic corrosion-resistant type bonded neodymium iron boron magnet according to claim 2, characterized in that the magnet main body (2a) is made of the following component raw materials in parts by weight: 95.5 parts of neodymium iron boron magnetic powder, 1.8 parts of thermosetting binder, 0.5 part of coupling agent, 0.4 part of lubricant, 0.4 part of curing agent, 0.8 part of accelerator and 0.6 part of reinforcing agent; the corrosion-resistant coating 2c is prepared from the following component raw materials in parts by weight: 75-85 parts of aluminum, 8-20 parts of copper, 1-2 parts of rare earth and 0.1-0.5 part of bismuth.

4. An anti-seismic corrosion-resistant bonded neodymium iron boron magnet according to claim 1, wherein the average grain size of the neodymium iron boron magnetic powder is 30-200 meshes; the thermosetting binder is bisphenol S type epoxy resin, bisphenol A type epoxy resin, bisphenol F type epoxy resin, hydrogenated bisphenol A type epoxy resin or polyfunctional glycidyl amine resin, and is in the form of powder with the granularity being more than or equal to 200 meshes; the coupling agent is a silane coupling agent KH-55; the lubricant is graphite powder or metal soap represented by zinc stearate; the curing agent can be aliphatic amine, polyamide, alicyclic amine, organic acid anhydride and dicyandiamide dispersion type latent curing agent; the accelerant is urea or imidazole derivatives which have good synergistic effect with dicyandiamide; the reinforcing agent is nano silicon dioxide.

5. A method for preparing a shock-resistant corrosion-resistant bonded NdFeB magnet according to any one of claims 1 to 4, comprising the steps of:

respectively taking a certain amount of neodymium iron boron magnetic powder and a thermosetting binder, stirring and mixing by using a planetary mixer or other mixing equipment under the protection of inert gases such as nitrogen or argon, and uniformly mixing for 15-60 minutes to obtain a premix;

step two, respectively taking a certain amount of coupling agent, curing agent, accelerator, reinforcing agent and organic solvent, adding into a mixing device filled with premix, and fully mixing to form rubber powder;

step three, adding a certain amount of lubricant into mixing equipment filled with a premix, and fully mixing to form a magnetic powder mixture;

step four, independently heating and decompressing after uniform mixing to remove the used organic solvent, or synchronously heating and decompressing during mixing to remove the used organic solvent;

putting the magnetic powder mixture into a mold for pressing to obtain a magnet green body;

sixthly, curing the magnet green body at the temperature of 155-175 ℃ for 1-3.5 h to obtain a bonded neodymium iron boron magnet; or step-by-step thermosetting treatment for 20-100 min under the protection of inert gases such as nitrogen or argon to prevent oxidation of magnetic powder;

step seven, electroplating is carried out on the surface of the bonded neodymium iron boron magnet to form an electroplated phosphorus layer (2b), 80 parts of aluminum, 15 parts of copper, 4.8 parts of rare earth and 0.2 part of bismuth are deposited on the surface of the electroplated phosphorus layer (2b) in a cathode electrophoretic deposition mode to form a corrosion-resistant coating (2c), and a vapor deposition film layer (2d) is coated outside the corrosion-resistant coating (2c) to obtain a corrosion-resistant magnet (2);

and step eight, the base shell (1) and the upper cover plate (3) are spliced, and the magnet (2) is fixed between the base shell (1) and the upper cover plate (3) to obtain the anti-seismic bonded NdFeB magnet.

Technical Field

The invention belongs to the technical field of bonded neodymium iron boron magnets, and relates to an anti-seismic corrosion-resistant bonded neodymium iron boron magnet and a preparation method thereof.

Background

Bonded magnets were present in approximately the 70's of the 20 th century, when SmCo had reached commercialization. Sintered permanent magnets have a good market condition, but are difficult to precisely machine into special shapes, are prone to cracking, breakage, edge drop, corner drop and the like in the machining process, and are difficult to assemble, so that the application of the sintered permanent magnets is limited. To solve this problem, permanent magnets are pulverized, mixed with plastic, and press-molded in a magnetic field, which is probably the most primitive manufacturing method of bonded magnets. The bonded NdFeB magnet is widely used due to its advantages of low cost, high dimensional accuracy, large freedom of shape, good mechanical strength, light specific gravity, etc., and has an annual growth rate of 35%. Since the advent of NdFeB permanent magnet powder, flexible bonded magnets have rapidly developed due to their high magnetic properties.

Compared with sintered magnet, it can be formed once, does not need secondary processing, and can be made into various magnets with complex shapes, which is also incomparable with sintered magnet, and its application can greatly reduce volume and weight of motor.

The existing magnet is not provided with a protective layer, and is often exposed in a humid environment, so that the magnet is easily corroded, and rusty spots are often generated, thereby affecting the performance of the magnet.

Therefore, the performance of the neodymium iron boron magnet is hardly affected, namely the performances of corrosion resistance, shock resistance and the like are increased while the magnetism of the whole magnet is ensured, and the magnet can be used in severe environments.

Disclosure of Invention

The invention aims to solve the problems in the prior art, provides an anti-seismic corrosion-resistant bonded neodymium iron boron magnet and a preparation method thereof, and aims to solve the technical problems that: how to realize the quick production of the bonded neodymium iron boron magnet and make the bonded neodymium iron boron magnet have the functions of shock resistance, corrosion resistance and the like.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides an antidetonation corrosion resistant type bonding neodymium iron boron magnet, includes base casing and upper cover plate, base casing inside is equipped with places the district, places the inside magnet that is equipped with in district, and the inside and outside side of placing the district all is equipped with outside groove and inside groove, forms the joint annular region between magnet and outside groove and the inside groove respectively, and the lower extreme of upper cover plate is equipped with outer ring and the interpolation ring of inserting, and outer ring and interpolation ring insert to close inside the joint annular region that corresponds, and the magnet includes the magnet main part, and the surface of magnet main part is equipped with electroplating phosphorus layer, corrosion resistant coating and gaseous phase deposition rete from inside to outside in proper order, the magnet main part is made by following component raw materials according to parts by weight: 94-96 parts of neodymium iron boron magnetic powder, 1.5-2 parts of thermosetting binder, 0.2-0.6 part of coupling agent, 0.1-0.5 part of lubricant, 0.1-0.5 part of curing agent, 0.1-1.5 parts of accelerator and 0.1-1 part of reinforcing agent; the thickness of the electroplating phosphorus layer is 6-18 mu m, and the corrosion-resistant coating is prepared from the following component raw materials in parts by weight: 75-85 parts of aluminum, 8-20 parts of copper, 1-2 parts of rare earth and 0.1-0.5 part of bismuth, wherein the vapor deposition film layer is an aluminum film, a chromium film, a titanium oxide film or a parylene film, and the thickness of the vapor deposition film layer 4 is 5-18 mu m.

The raw material proportion of the invention is scientific and reasonable, the mechanical strength of the neodymium iron boron magnet is improved, and the magnetic performance is good; the corrosion resistance of the magnet body is improved by sequentially coating the electroplating phosphorus layer, the corrosion-resistant coating and the gas-phase deposition film layer on the surface of the magnet body; through the cooperation of base casing and upper cover plate, tightly wrap up the magnet, improved its anti-falling anti-seismic performance.

The magnet body is prepared from the following component raw materials in parts by weight: 94.5-95.5 parts of neodymium iron boron magnetic powder, 1.6-1.8 parts of thermosetting binder, 0.3-0.5 part of coupling agent, 0.2-0.4 part of lubricant, 0.2-0.4 part of curing agent, 0.2-1.3 parts of accelerator, 0.2-0.8 part of reinforcing agent, and the corrosion-resistant coating 2c is prepared from the following component raw materials in parts by weight: 75-85 parts of aluminum, 8-20 parts of copper, 1-2 parts of rare earth and 0.1-0.5 part of bismuth.

The magnet body is prepared from the following component raw materials in parts by weight: 95.5 parts of neodymium iron boron magnetic powder, 1.8 parts of thermosetting binder, 0.5 part of coupling agent, 0.4 part of lubricant, 0.4 part of curing agent, 0.8 part of accelerator and 0.6 part of reinforcing agent; the corrosion-resistant coating 2c is prepared from the following component raw materials in parts by weight: 75-85 parts of aluminum, 8-20 parts of copper, 1-2 parts of rare earth and 0.1-0.5 part of bismuth.

The average particle size of the neodymium iron boron magnetic powder is 30-200 meshes; the thermosetting binder is bisphenol S type epoxy resin, bisphenol A type epoxy resin, bisphenol F type epoxy resin, hydrogenated bisphenol A type epoxy resin or polyfunctional glycidyl amine resin, and is in the form of powder with the granularity being more than or equal to 200 meshes; the coupling agent is a silane coupling agent KH-55; the lubricant is graphite powder or metal soap represented by zinc stearate; the curing agent can be aliphatic amine, polyamide, alicyclic amine, organic acid anhydride and dicyandiamide dispersion type latent curing agent; the accelerant is urea or imidazole derivatives which have good synergistic effect with dicyandiamide; the reinforcing agent is nano silicon dioxide.

The preparation method of the anti-seismic corrosion-resistant bonded neodymium iron boron magnet comprises the following steps:

respectively taking a certain amount of neodymium iron boron magnetic powder and a thermosetting binder, stirring and mixing by using a planetary mixer or other mixing equipment under the protection of inert gases such as nitrogen or argon, and uniformly mixing for 15-60 minutes to obtain a premix;

step two, respectively taking a certain amount of coupling agent, curing agent, accelerator, reinforcing agent and organic solvent, adding into a mixing device filled with premix, and fully mixing to form rubber powder;

step three, adding a certain amount of lubricant into mixing equipment filled with a premix, and fully mixing to form a magnetic powder mixture;

step four, independently heating and decompressing after uniform mixing to remove the used organic solvent, or synchronously heating and decompressing during mixing to remove the used organic solvent;

putting the magnetic powder mixture into a mold for pressing to obtain a magnet green body;

sixthly, curing the magnet green body at the temperature of 155-175 ℃ for 1-3.5 h to obtain a bonded neodymium iron boron magnet; or step-by-step thermosetting treatment for 20-100 min under the protection of inert gases such as nitrogen or argon to prevent oxidation of magnetic powder;

electroplating the surface of the bonded neodymium iron boron magnet to form an electroplated phosphorus layer, depositing 80 parts of aluminum, 15 parts of copper, 4.8 parts of rare earth and 0.2 part of bismuth on the surface of the electroplated phosphorus layer in a cathode electrophoretic deposition mode to form an anti-corrosion coating, and covering a vapor deposition film layer outside the anti-corrosion coating to obtain the anti-corrosion magnet;

and step eight, splicing the base shell and the upper cover plate, and fixing the magnet between the base shell and the upper cover plate to obtain the anti-seismic bonded NdFeB magnet.

Compared with the prior art, the anti-seismic corrosion-resistant bonded neodymium iron boron magnet and the preparation method thereof have the following advantages:

the raw material proportion of the invention is scientific and reasonable, the mechanical strength of the neodymium iron boron magnet is improved, and the magnetism is good; the corrosion resistance of the magnet body is improved by sequentially coating the electroplating phosphorus layer, the corrosion-resistant coating and the gas-phase deposition film layer on the surface of the magnet body; through the cooperation of base casing and upper cover plate, tightly wrap up the magnet, improved its anti-falling anti-seismic performance.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic view of an exploded structure of the present invention;

FIG. 3 is a schematic view of the structure of the upper cover plate of the present invention;

FIG. 4 is a schematic structural view of a magnet according to the present invention in partial section;

in the figure: 1-base shell, 1 a-outer edge groove, 1 b-inner edge groove, 1 c-placing area, 2-magnet, 2 a-magnet body, 2 b-electroplating phosphor layer, 2 c-corrosion-resistant coating, 2 d-vapor deposition film layer, 3-upper cover plate, 3 a-outer insert ring and 3 b-inner insert ring.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.

In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are intended to be construed broadly, e.g., as meaning fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

Please refer to fig. 1-3, a antidetonation corrosion resistant type bonding neodymium iron boron magnet, including base housing 1 and upper cover plate 3, base housing 1 is inside to be equipped with places district 1c, place the inside magnet 2 that is equipped with of district 1c, the inside and outside side of placing district 1c all is equipped with outside groove 1a and interior limit groove 1b, form the joint annular region between magnet 2 and outside groove 1a and interior limit groove 1b respectively, the lower extreme of upper cover plate 3 is equipped with outer insert ring 3a and interior insert ring 3b, outer insert ring 3a and interior insert ring 3b insert and close inside the joint annular region that corresponds, magnet 2 includes magnet main part 2a, the surface of magnet main part 2a is equipped with electroplating phosphorus layer 2b from inside to outside in proper order, corrosion resistant coating 2c and vapour deposition rete 2d, magnet main part 2a is made by following component raw materials according to parts by weight: 94-96 parts of neodymium iron boron magnetic powder, 1.5-2 parts of thermosetting binder, 0.2-0.6 part of coupling agent, 0.1-0.5 part of lubricant, 0.1-0.5 part of curing agent, 0.1-1.5 parts of accelerator and 0.1-1 part of reinforcing agent; the thickness of the electroplating phosphorus layer 2b is 6-18 mu m, and the corrosion-resistant coating 2c is prepared from the following component raw materials in parts by weight: 75-85 parts of aluminum, 8-20 parts of copper, 1-2 parts of rare earth and 0.1-0.5 part of bismuth, wherein the vapor deposition film layer 2d is an aluminum film, a chromium film, a titanium oxide film or a parylene film, and the thickness of the vapor deposition film layer 4 is 5-18 mu m.

The raw material proportion of the invention is scientific and reasonable, the mechanical strength of the neodymium iron boron magnet is improved, and the magnetism is good; the surface of the magnet main body 2a is coated with the electroplated phosphorus layer 2b, the corrosion-resistant coating 2c and the gas-phase deposition film layer 2d in sequence, so that the corrosion resistance of the magnet main body is improved; through base casing 1 and the cooperation of upper cover plate 3, tightly wrap up magnet 2, improved its anti-falling anti-seismic performance.

The magnet body 2a is prepared from the following component raw materials in parts by weight: 94.5-95.5 parts of neodymium iron boron magnetic powder, 1.6-1.8 parts of thermosetting binder, 0.3-0.5 part of coupling agent, 0.2-0.4 part of lubricant, 0.2-0.4 part of curing agent, 0.2-1.3 parts of accelerator, 0.2-0.8 part of reinforcing agent, and the corrosion-resistant coating 2c is prepared from the following component raw materials in parts by weight: 75-85 parts of aluminum, 8-20 parts of copper, 1-2 parts of rare earth and 0.1-0.5 part of bismuth.

The average grain size of the neodymium iron boron magnetic powder is 30-200 meshes; the thermosetting binder is bisphenol S type epoxy resin, bisphenol A type epoxy resin, bisphenol F type epoxy resin, hydrogenated bisphenol A type epoxy resin or polyfunctional glycidyl amine resin, and is in the form of powder with the granularity being more than or equal to 200 meshes; the coupling agent is a silane coupling agent KH-55; the lubricant is graphite powder or metal soap represented by zinc stearate; the curing agent can be aliphatic amine, polyamide, alicyclic amine, organic acid anhydride and dicyandiamide dispersion type latent curing agent; the accelerant is urea or imidazole derivatives which have good synergistic effect with dicyandiamide; the reinforcing agent is nano silicon dioxide.

Example 1

A shock-resistant corrosion-resistant type bonding neodymium iron boron magnet, a magnet main body 2a is prepared from the following component raw materials in parts by weight: 95.5 parts of neodymium iron boron magnetic powder, 1.8 parts of thermosetting binder, 0.5 part of coupling agent, 0.4 part of lubricant, 0.4 part of curing agent, 0.8 part of accelerator and 0.6 part of reinforcing agent; the corrosion-resistant coating 2c is prepared from the following component raw materials in parts by weight: 75-85 parts of aluminum, 8-20 parts of copper, 1-2 parts of rare earth and 0.1-0.5 part of bismuth.

In this embodiment, a preparation method of the anti-seismic corrosion-resistant bonded neodymium iron boron magnet includes the following steps:

respectively taking a certain amount of neodymium iron boron magnetic powder and a thermosetting binder, stirring and mixing by using a planetary mixer or other mixing equipment under the protection of inert gases such as nitrogen or argon, and uniformly mixing for 15-60 minutes to obtain a premix;

step two, respectively taking a certain amount of coupling agent, curing agent, accelerator, reinforcing agent and organic solvent, adding into a mixing device filled with premix, and fully mixing to form rubber powder;

step three, adding a certain amount of lubricant into mixing equipment filled with a premix, and fully mixing to form a magnetic powder mixture;

step four, independently heating and decompressing after uniform mixing to remove the used organic solvent, or synchronously heating and decompressing during mixing to remove the used organic solvent;

putting the magnetic powder mixture into a mold for pressing to obtain a magnet green body;

sixthly, curing the magnet green body at the temperature of 155-175 ℃ for 1-3.5 h to obtain a bonded neodymium iron boron magnet; or step-by-step thermosetting treatment for 20-100 min under the protection of inert gases such as nitrogen or argon to prevent oxidation of magnetic powder;

step seven, electroplating is carried out on the surface of the bonded neodymium iron boron magnet to form an electroplated phosphorus layer 2b, 80 parts of aluminum, 15 parts of copper, 4.8 parts of rare earth and 0.2 part of bismuth are deposited on the surface of the electroplated phosphorus layer 2b in a cathode electrophoretic deposition mode to form a corrosion-resistant coating 2c, and a vapor deposition film layer 2d is coated outside the corrosion-resistant coating 2c to obtain a corrosion-resistant magnet 2;

and step eight, splicing the base shell 1 and the upper cover plate 3, and fixing the magnet 2 between the base shell 1 and the upper cover plate 3 to obtain the anti-seismic bonded neodymium iron boron magnet.

Example 2

A shock-resistant corrosion-resistant type bonding neodymium iron boron magnet, a magnet main body 2a is prepared from the following component raw materials in parts by weight: 95 parts of neodymium iron boron magnetic powder, 1.9 parts of thermosetting binder, 0.6 part of coupling agent, 0.5 part of lubricant, 0.5 part of curing agent, 0.9 part of accelerator and 0.6 part of reinforcing agent; the corrosion-resistant coating 2c is prepared from the following component raw materials in parts by weight: 75-85 parts of aluminum, 8-20 parts of copper, 1-2 parts of rare earth and 0.1-0.5 part of bismuth.

In this embodiment, a preparation method of the anti-seismic corrosion-resistant bonded neodymium iron boron magnet includes the following steps:

respectively taking a certain amount of neodymium iron boron magnetic powder and a thermosetting binder, stirring and mixing by using a planetary mixer or other mixing equipment under the protection of inert gases such as nitrogen or argon, and uniformly mixing for 15-60 minutes to obtain a premix;

step two, respectively taking a certain amount of coupling agent, curing agent, accelerator, reinforcing agent and organic solvent, adding into a mixing device filled with premix, and fully mixing to form rubber powder;

step three, adding a certain amount of lubricant into mixing equipment filled with a premix, and fully mixing to form a magnetic powder mixture;

step four, independently heating and decompressing after uniform mixing to remove the used organic solvent, or synchronously heating and decompressing during mixing to remove the used organic solvent;

putting the magnetic powder mixture into a mold for pressing to obtain a magnet green body;

sixthly, curing the magnet green body at the temperature of 155-175 ℃ for 1-3.5 h to obtain a bonded neodymium iron boron magnet; or step-by-step thermosetting treatment for 20-100 min under the protection of inert gases such as nitrogen or argon to prevent oxidation of magnetic powder;

step seven, electroplating is carried out on the surface of the bonded neodymium iron boron magnet to form an electroplated phosphorus layer 2b, 80 parts of aluminum, 15 parts of copper, 4.8 parts of rare earth and 0.2 part of bismuth are deposited on the surface of the electroplated phosphorus layer 2b in a cathode electrophoretic deposition mode to form a corrosion-resistant coating 2c, and a vapor deposition film layer 2d is coated outside the corrosion-resistant coating 2c to obtain a corrosion-resistant magnet 2;

and step eight, splicing the base shell 1 and the upper cover plate 3, and fixing the magnet 2 between the base shell 1 and the upper cover plate 3 to obtain the anti-seismic bonded neodymium iron boron magnet.

Example 3

A shock-resistant corrosion-resistant type bonding neodymium iron boron magnet, a magnet main body 2a is prepared from the following component raw materials in parts by weight: 95 parts of neodymium iron boron magnetic powder, 1.8 parts of thermosetting binder, 0.6 part of coupling agent, 0.5 part of lubricant, 0.5 part of curing agent, 0.8 part of accelerator and 0.7 part of reinforcing agent; the corrosion-resistant coating 2c is prepared from the following component raw materials in parts by weight: 75-85 parts of aluminum, 8-20 parts of copper, 1-2 parts of rare earth and 0.1-0.5 part of bismuth.

In this embodiment, a preparation method of the anti-seismic corrosion-resistant bonded neodymium iron boron magnet includes the following steps:

respectively taking a certain amount of neodymium iron boron magnetic powder and a thermosetting binder, stirring and mixing by using a planetary mixer or other mixing equipment under the protection of inert gases such as nitrogen or argon, and uniformly mixing for 15-60 minutes to obtain a premix;

step two, respectively taking a certain amount of coupling agent, curing agent, accelerator, reinforcing agent and organic solvent, adding into a mixing device filled with premix, and fully mixing to form rubber powder;

step three, adding a certain amount of lubricant into mixing equipment filled with a premix, and fully mixing to form a magnetic powder mixture;

step four, independently heating and decompressing after uniform mixing to remove the used organic solvent, or synchronously heating and decompressing during mixing to remove the used organic solvent;

putting the magnetic powder mixture into a mold for pressing to obtain a magnet green body;

sixthly, curing the magnet green body at the temperature of 155-175 ℃ for 1-3.5 h to obtain a bonded neodymium iron boron magnet; or step-by-step thermosetting treatment for 20-100 min under the protection of inert gases such as nitrogen or argon to prevent oxidation of magnetic powder;

step seven, electroplating is carried out on the surface of the bonded neodymium iron boron magnet to form an electroplated phosphorus layer 2b, 80 parts of aluminum, 15 parts of copper, 4.8 parts of rare earth and 0.2 part of bismuth are deposited on the surface of the electroplated phosphorus layer 2b in a cathode electrophoretic deposition mode to form a corrosion-resistant coating 2c, and a vapor deposition film layer 2d is coated outside the corrosion-resistant coating 2c to obtain a corrosion-resistant magnet 2;

and step eight, splicing the base shell 1 and the upper cover plate 3, and fixing the magnet 2 between the base shell 1 and the upper cover plate 3 to obtain the anti-seismic bonded neodymium iron boron magnet.

Experimental cases (as shown in table 1 below) are divided into 3 groups, a certain amount of raw materials are taken according to the above embodiments, the anti-shock and anti-corrosion type bonded neodymium iron boron magnet is produced according to the above steps, the same amount of bonded neodymium iron boron magnet is produced in each embodiment, then the anti-corrosion and anti-falling experiments are carried out, the comparison experiment is carried out, and the observation is carried out.

TABLE 1

According to the experimental data in the above table 1, it can be known that the bonded neodymium iron boron magnet prepared in the embodiment 2 has the best anti-falling and corrosion-resistant effects, and the bonded neodymium iron boron magnet prepared in the invention has better anti-falling, anti-vibration and corrosion-resistant effects, and in the embodiments 1 to 3, the magnet 2 is tightly wrapped by the cooperation of the base shell 1 and the upper cover plate 3, so that the anti-falling, anti-vibration and corrosion-resistant properties of the bonded neodymium iron boron magnet are improved.

In conclusion, the raw material proportion of the invention is scientific and reasonable, the mechanical strength of the neodymium iron boron magnet is improved, and the magnetism is good; the surface of the magnet main body 2a is coated with the electroplated phosphorus layer 2b, the corrosion-resistant coating 2c and the gas-phase deposition film layer 2d in sequence, so that the corrosion resistance of the magnet main body is improved; through the cooperation of base casing 1 and upper cover plate 3, tightly wrap up magnet 2, improved its corrosion-resistant, anti-falling anti-seismic performance.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.