CN113755066B - Anti-oxidation adhesive for coating hydride on sintered neodymium iron boron and application thereof - Google Patents
Anti-oxidation adhesive for coating hydride on sintered neodymium iron boron and application thereof Download PDFInfo
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- CN113755066B CN113755066B CN202110882538.XA CN202110882538A CN113755066B CN 113755066 B CN113755066 B CN 113755066B CN 202110882538 A CN202110882538 A CN 202110882538A CN 113755066 B CN113755066 B CN 113755066B
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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
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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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
- 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
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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
- 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
- C09D7/63—Additives non-macromolecular organic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
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- 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
- H01F41/0253—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 for manufacturing permanent magnets
- H01F41/0293—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 for manufacturing permanent magnets diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
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- 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
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
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Abstract
The invention provides an anti-oxidation adhesive for coating hydride on sintered neodymium iron boron and application thereof, relating to the technical field of antioxidants. The anti-oxidation adhesive comprises the following raw materials in parts by weight: resin: 3-6 parts of additive: 20-30 parts of silicon carbide: 20-30 parts of boric acid: 4-8 parts of organic solvent: 30-50 parts. The anti-oxidation adhesive provided by the invention can prevent the hydride from being oxidized, reduce the cost of grain boundary diffusion of the sintered neodymium iron boron and improve the stability of the sintered neodymium iron boron, and the hydride added with the anti-oxidation adhesive can be stably stored for one year in an atmospheric state, so that the performance of the hydride cannot be reduced when the hydride is used again, the hydride is more favorable for recycling heavy rare earth powder remained in production equipment, and the utilization rate can reach 99%.
Description
Technical Field
The invention relates to the technical field of antioxidants, in particular to an anti-oxidation adhesive for coating hydride on sintered neodymium iron boron and application thereof.
Background
In recent years, with the development of science and technology, sintered neodymium iron boron becomes an important magnet material, and the sintered neodymium iron boron is widely applied to the fields of computers, automobiles, household appliances and the like. Sintered Nd-Fe-B permanent magnetic material has become the core functional material in the fields of electric power, telecommunication, automobile, computer, biomedicine and household appliance. One of the evaluation indexes of the sintered neodymium iron boron performance is the coercive force, and many researches are focused on improving the coercive force of the sintered neodymium iron boron.
Grain boundary diffusion, which is a method for improving coercive force, has been widely studied, and is formed by introducing a fluoride, hydride or oxide containing a heavy rare earth element Dy or Tb into the surface of a magnet, then performing heat treatment to diffuse the heavy rare earth atoms along the liquid phase of the grain boundary, and replacing the original Nd in the surface layer of the main phase crystal grains (Nd,Dy，Tb) 2 Fe 14 in the B solid solution, the center of the main phase grain is not influenced too much, so that the remanence and the maximum energy product of the magnet are not influenced too much while the magnetocrystalline anisotropy field of the grain surface layer is enhanced to improve the intrinsic coercivity.
Compared with the traditional alloying element adding method, the grain boundary diffusion method can obtain the high-coercivity magnet by using lower Dy and Tb heavy rare earth. However, such fluoride, hydride or oxide has a high melting point, and if a diffusion effect is to be ensured, it requires a large amount of energy and a high cost, and in mass production, hydride or the like containing a heavy rare earth element is first pulverized into fine powder of at least a micrometer level, but the fine powder is easily oxidized, which affects a further diffusion effect, decreases the stability of a product, and increases the cost of grain boundary diffusion.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an anti-oxidation adhesive for coating hydride on sintered neodymium iron boron, which is added into a system, so that the cost of grain boundary diffusion can be reduced, the stability of a product is improved, the effect cannot be influenced when the product is stored for one year under an atmospheric state, in addition, in the practical production and application process, the residual heavy rare earth powder in equipment is convenient to clean, recycle and utilize, and the utilization rate can reach 99 percent.
In order to achieve the purpose, the invention adopts the following technical scheme:
an anti-oxidation adhesive for coating hydride on sintered neodymium iron boron comprises the following raw materials in parts by weight:
resin: 3-6 parts;
additive: 10-20 parts;
silicon carbide: 20-30 parts;
boric acid: 4-8 parts;
organic solvent: 30-50 parts.
Preferably, the resin is acrylic resin or epoxy resin.
Preferably, the epoxy resin is epoxy resin E44 or epoxy resin E42.
Preferably, the organic solvent is one or more of acetone, toluene, butanone and xylene.
Preferably, the additive is benzotriazole or imidazole.
The invention provides an application of an anti-oxidation adhesive for coating a hydride on sintered neodymium iron boron.
The inventor of the application finds that the heavy rare earth element is diffused into the sintered neodymium iron boron by adding hydride or fluoride containing the heavy rare earth element and the like through grain boundary diffusion so as to improve the coercive force of the sintered neodymium iron boron. However, this method has the disadvantage that hydride and other substances are usually ground into fine powder, but the fine powder is easily oxidized, which affects the effect of lattice diffusion, increases the cost of diffusion, and affects the coercivity of the sintered nd-fe-b. Therefore, the inventor of the application invents an anti-oxidation adhesive for coating a hydride on sintered neodymium iron boron, and the anti-oxidation adhesive is added into the hydride, so that the hydride can be prevented from being oxidized, a good diffusion effect of the anti-oxidation adhesive in a sintered neodymium iron boron lattice is ensured, and the coercive force of the sintered neodymium iron boron is improved.
The oxidation-resistant adhesive comprises resin, additive, silicon carbide, boric acid and organic solvent.
The addition of the silicon carbide and the boric acid can play a role in preventing the oxidation of hydride, the silicon carbide and the boric acid are dispersed into the organic solvent, and the resin is added, so that the silicon carbide and the boric acid can be well adhered to the surface of the sintered neodymium-iron-boron magnetic steel. The addition of additives such as benzotriazole can further inhibit the oxidation of the whole system of the hydride after the addition of the anti-oxidation adhesive, prevent the corrosion reaction from proceeding, and effectively prolong the use effect of the anti-oxidation adhesive.
Compared with the prior art, the invention has the following beneficial effects:
(1) the anti-oxidation adhesive of the invention can well disperse the hydride therein, prevent the hydride from being oxidized, reduce the cost of the sintered NdFeB lattice diffusion and improve the stability of the product.
(2) Under the atmospheric condition, the hydride added with the anti-oxidation adhesive can be stably stored for one year, and when the hydride is used again, the performance of improving the coercive force of the sintered neodymium iron boron can not be reduced.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further clarified with the specific embodiments.
An anti-oxidation adhesive for coating hydride on sintered neodymium iron boron comprises the following raw materials in parts by weight:
resin: 3-6 parts;
additive: 10-20 parts;
silicon carbide: 20-30 parts of a solvent;
boric acid: 4-8 parts;
organic solvent: 30-50 parts.
In the invention, the addition of the silicon carbide and the boric acid can play a role in preventing the oxidation of hydride, the silicon carbide and the boric acid are dispersed into the organic solvent, and the resin is added, so that the silicon carbide and the boric acid can be well adhered to the surface of the sintered neodymium iron boron magnetic steel. The addition of additives such as benzotriazole can further inhibit the oxidation of the whole system of the hydride after the addition of the anti-oxidation type adhesive agent, and prevent the corrosion reaction from proceeding.
In the invention, the resin is acrylic resin, epoxy resin E44 or epoxy resin E42, and the weight part of the resin in the system is 3-6 parts, in the embodiment of the invention, the resin is acrylic resin or epoxy resin E44, and the weight part is 3 parts, 4 parts or 5 parts.
In the invention, the additive is benzotriazole or imidazole, and the weight part of the additive in the system is 10-20 parts, and in the embodiment of the invention, the used additive is benzotriazole or imidazole, and the weight part is 10 parts, 15 parts or 18 parts.
In the invention, the silicon carbide is 20-30 parts by weight, in the embodiment of the invention, the silicon carbide is 20 parts, 25 parts or 30 parts by weight, and the boric acid is: 4-8 parts, and in the embodiment of the invention, the specific parts by weight are 4 parts, 6 parts or 8 parts.
In the invention, the organic solvent is one or more of acetone, toluene, butanone and xylene, and the weight part of the organic solvent is 30-50 parts, and in the embodiment of the invention, the used solvent is acetone or butanone, and the specific weight part is 30 parts, 35 parts or 42 parts.
In the following examples, acrylic resin was an Weifang Fule new material CFW313, epoxy resin E44 was provided by Nantong Xinchen chemical Co., Ltd, sintered NdFeB magnet steel was N42, provided by Zhenghai magnet Co., Ltd, and the remaining reagents were conventional laboratory products provided by Aladdin reagent Co., Ltd.
Example 1
Mixing 20 parts of silicon carbide and 4 parts of boric acid, dispersing into 30 parts of acetone, adding 3 parts of acrylic resin into the system, adding 10 parts of benzotriazole, and stirring for 40min to obtain the anti-oxidation adhesive.
Example 2
Mixing 25 parts of silicon carbide and 6 parts of boric acid, dispersing into 35 parts of butanone, adding 4 parts of acrylic resin into the system, adding 15 parts of imidazole, and stirring for 40min to obtain the anti-oxidation adhesive.
Example 3
And mixing 30 parts of silicon carbide and 8 parts of boric acid, dispersing into 42 parts of butanone, adding 5 parts of epoxy resin E44 into the system, adding 18 parts of imidazole, and stirring for 40min to obtain the anti-oxidation adhesive.
Example 4
And mixing 30 parts of silicon carbide and 4 parts of boric acid, dispersing into 35 parts of acetone, adding 4 parts of epoxy resin E44 into the system, adding 18 parts of imidazole, and stirring for 40min to obtain the anti-oxidation adhesive.
Example 5
And (2) mixing 20 parts of silicon carbide and 8 parts of boric acid, dispersing into 42 parts of acetone, adding 4 parts of epoxy resin E44 into the system, adding 10 parts of benzotriazole, and stirring for 40min to obtain the anti-oxidation adhesive.
Comparative example 1
The procedure for preparing the oxidation preventing type adhesives of this comparative example and example 1 was substantially the same except that silicon carbide and boric acid were not added.
Comparative example 2
The procedure of preparing the oxidation-preventing type adhesive of this comparative example was substantially the same as that of example 1, except that no epoxy resin was added.
Comparative example 3
The procedure for preparing the oxidation-preventing type adhesives of this comparative example and example 1 was substantially the same, except that 5 parts of silicon carbide and 1 part of boric acid were added.
The anti-oxidation type adhesive obtained in the examples 1 to 5 and the comparative examples 1 to 3 is added into hydride, and the mass ratio of the two is 1: 5, the sample was left under the same environment for 5 hours, and then the oxygen content in the system was measured, and the measurement results are shown in Table 1:
TABLE 1 test results of oxygen contents of the mixture of the oxidation preventing type adhesive and the hydride obtained in examples 1 to 5 and comparative examples 1 to 3
| Group of | Oxygen content (ppm) |
| Example 1 | 252 |
| Example 2 | 189 |
| Example 3 | 136 |
| Example 4 | 144 |
| Example 5 | 231 |
| Comparative example 1 | 1123 |
| Comparative example 2 | 386 |
| Comparative example 3 | 493 |
8 parts of the mixture of the anti-oxidation adhesive and the hydride after being placed for 5 hours is sprayed into the neodymium iron boron magnet, and then the coercive force is measured, wherein the measurement results are shown in the table 2:
TABLE 2 measurement results of coercive force of the oxidation-preventing type adhesive agent and the hydride obtained in examples 1 to 5 and comparative examples 1 to 3 sprayed on the NdFeB magnet
As can be seen from the data in tables 1 and 2, the addition of the anti-oxidation type adhesion agent of the present invention to the hydride can prevent the oxidation of the hydride and increase the coercivity of the neodymium iron boron magnet.
The foregoing shows and describes the general principles, essential features, and inventive features of this invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. An anti-oxidation adhesive for coating hydride on sintered neodymium iron boron is characterized by comprising the following raw materials in parts by weight:
resin: 3-6 parts;
additive: 10-20 parts;
silicon carbide: 20-30 parts of a solvent;
boric acid: 4-8 parts;
organic solvent: 30-50 parts;
the resin is acrylic resin or epoxy resin;
the additive is benzotriazole or imidazole.
2. The oxidation-resistant adhesive for coating hydride on sintered neodymium-iron-boron according to claim 1, wherein the epoxy resin is epoxy resin E44 or epoxy resin E42.
3. The anti-oxidation adhesive for coating hydride on sintered NdFeB as claimed in claim 1, wherein the organic solvent is one or more of acetone, toluene, butanone and xylene.
4. Use of an oxidation resistant adhesive according to any one of claims 1 to 3 in coating a hydride with sintered neodymium iron boron.
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| CN202110882538.XA CN113755066B (en) | 2021-08-02 | 2021-08-02 | Anti-oxidation adhesive for coating hydride on sintered neodymium iron boron and application thereof |
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| CN202110882538.XA CN113755066B (en) | 2021-08-02 | 2021-08-02 | Anti-oxidation adhesive for coating hydride on sintered neodymium iron boron and application thereof |
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| EP2484464B1 (en) * | 2010-05-19 | 2018-08-01 | Sumitomo Electric Industries, Ltd. | Powder for magnetic member, powder compact, and magnetic member |
| CN105632748B (en) * | 2015-12-25 | 2019-01-11 | 宁波韵升股份有限公司 | A method of improving sintered NdFeB thin slice magnet magnetic property |
| GB2555608A (en) * | 2016-11-04 | 2018-05-09 | Rolls Royce Plc | A magnetic material and a method of sythesising the same |
| CN107578912A (en) * | 2017-09-25 | 2018-01-12 | 烟台正海磁性材料股份有限公司 | A kind of preparation method of the neodymium iron boron magnetic body with high-coercive force |
| CN110415960B (en) * | 2019-07-19 | 2021-06-18 | 浙江东阳东磁稀土有限公司 | Method for improving magnetic property of sintered neodymium-iron-boron magnet |
| CN110676043A (en) * | 2019-09-02 | 2020-01-10 | 徐州给力磁业有限公司 | Preparation method of neodymium iron boron magnet |
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Application publication date: 20211207 Assignee: Shenzhen Suntech Qihui Investment Management Center (L.P.) Assignor: ANHUI HANHAI NEW MATERIAL Co.,Ltd. Contract record no.: X2023980035631 Denomination of invention: An anti oxidation adhesive for sintered neodymium iron boron coated hydride and its application Granted publication date: 20220913 License type: Common License Record date: 20230519 |