An additive and its application, 2-17 type samarium cobalt magnet and its preparation method

Abstract

The present invention discloses an additive and its application, a 2-17 type samarium cobalt magnet and its preparation method. The additive comprises, by mass percentage, 20% to 30% of an organic copper complex, 0.5% to 1% of a plasticizer and an organic solvent, the sum of the mass percentages of each component being 100%; wherein the organic copper complex is an oil-soluble substance, the mass percentage of the Cu element in the organic copper complex is more than 10%, and the organic copper complex contains a polar group and / or an alkyl chain with more than 3 C atoms. The preparation method of the present invention is to prepare Sm2Co 17 The permanent magnet method can greatly eliminate the adverse effects of the grain boundary copper deficiency phenomenon without reducing the remanence, and improve the coercive force, squareness and magnetic energy product of the product.

Description

Technical Field

[0001] The invention relates to an additive and application thereof, a 2-17 type samarium cobalt magnet and a preparation method thereof. Background Art

[0002] Sm2Co 17 Permanent magnet materials (also known as 2-17 type samarium-cobalt magnets) commonly suffer from copper-poor grain boundaries, a major obstacle to improving their performance, especially squareness. This copper-poor grain boundary structure creates a weak domain wall pinning field, which easily forms demagnetization centers during demagnetization, thereby reducing the magnet's coercive force, squareness, and magnetic energy product.

[0003] Current practice is to directly add micron- or nanometer-scale copper or copper oxide powder to the jet-milled powder to improve the copper-poor grain boundary phenomenon. For example, CN111145973A discloses a method for producing magnets containing Cu grain boundary phases by pressing and sintering a mixture of CuO powder and samarium-cobalt powder. While this method can improve coercivity and squareness to a certain extent, the large size of the micron powder and the introduction of non-magnetic grain boundary phases can lead to a decrease in remanence. Nanopowders, on the other hand, suffer from uneven dispersion, resulting in limited results. Furthermore, there are also reports of methods using copper diffusion treatment to control grain boundaries, but this diffusion method is only effective for thin samples, limiting its scope of application. Summary of the Invention

[0004] The present invention aims to solve the problem in the prior art of overcoming the 17 When the problem of poor magnetic performance, especially low squareness, is solved due to the copper-poor phenomenon at the grain boundaries in permanent magnet materials, only limited improvement of coercivity and squareness can be achieved, while also resulting in the defect of reduced remanence. An additive and its application, a 2-17 type samarium cobalt magnet and a preparation method thereof are provided. 17 The permanent magnet method can greatly eliminate the adverse effects of the grain boundary copper deficiency phenomenon without reducing the remanence, and improve the coercive force, squareness and magnetic energy product of the product.

[0005] The present invention solves the above technical problems through the following technical solutions.

[0006] The present invention provides an additive, which comprises, calculated by mass percentage, 20% to 30% of an organic copper complex, 0.5% to 1% of a plasticizer and an organic solvent, wherein the sum of the mass percentages of the components is 100%;

[0007] The organic copper complex is an oil-soluble substance, the mass percentage of Cu element in the organic copper complex is more than 10%, and the organic copper complex contains polar groups and / or alkyl chains with more than 3 C atoms.

[0008] In the present invention, the organic copper complex can be a conventional oil-soluble organic copper complex in the art, for example, a complex completely soluble in an inert solvent such as toluene, mineral oil, etc. The inert solvent generally refers to a solvent that does not chemically react with the organic copper complex.

[0009] Preferably, the polar group in the organic copper complex is one or more of a hydroxyl group, a carboxyl group, an amino group, an ester group and an amide group.

[0010] The alkyl chain in the organic copper complex may be a saturated alkyl chain or an unsaturated alkyl chain; the alkyl chain may be a straight chain or a branched chain.

[0011] Among them, preferably, the organic copper complex is one or more of substituted carboxylate copper complexes, carboxylate copper derivatives, thiophosphate copper complexes, quinoline copper, hydroxyquinoline copper, copper phthalate, thiothioate copper, copper acetylacetonate and copper acetylacetate.

[0012] The general formula of the substituted carboxylate copper complex is preferably [RCO2]2Cu, where R is an alkyl group, an alkynyl group, a cyclic group, an aryl group or a heteroaryl group; preferably, the substituted carboxylate copper complex is one or more of a fatty acid copper having 10 to 22 carbon atoms, copper styrene maleate, copper picolinate, copper 2-pyrazinecarboxylate, copper 2-ethylhexanoate, copper methacrylate, cuprous thiophene-2-carboxylate, copper methionine and copper tartrate; and the fatty acid copper having 10 to 22 carbon atoms is preferably one or more of copper oleate, copper linoleate, copper stearate, copper rosinate, copper hexadecanoate, copper palmitate and copper naphthenate.

[0013] Among them, the copper carboxylate derivative is preferably a copper thiocarboxylate derivative [R'CS2]2Cu or a copper selenocarboxylate derivative [R'CSe2]2Cu, where R' includes an alkyl group and an alkyl derivative; preferably, the copper carboxylate derivative is N,N-di-n-butyl copper dithiocarbamate (Cu(SC(S)N(C4H9)2)2) and / or N,N-di-n-butyl copper diselenocarbamate (Cu(SeC(Se)N(C4H9)2)2).

[0014] The copper thiophosphate complex is preferably a copper complex of a dialkyl dithiophosphate, having the general formula (RO)2P(S)SHM, where R is an alkyl or aryl group, and M includes monovalent copper and divalent copper (CuDDP for short). Preferably, the copper thiophosphate complex is one or more of dihexyl copper dithiophosphate, dibutyl copper dithiophosphate, copper-containing antioxidant T541, and copper-containing antioxidant T542. Copper-containing antioxidants T541 and T542 can be purchased from the Additives Plant of Jinzhou Petrochemical Company.

[0015] Preferably, the particle size of the organic copper complex is less than 10 μm.

[0016] In the present invention, preferably, the mass percentage of the organic copper complex to the additive is 20%, 22%, 23%, 25%, 27% or 30%.

[0017] In the present invention, the plasticizer can be a conventional plasticizer in the art. Preferably, the plasticizer is a phthalate ester and / or epoxy soybean oil, more preferably one or more of dibutyl phthalate, dioctyl phthalate and epoxy soybean oil. By combining the plasticizer and its dosage with other components of the additive, the organic copper complex can be evenly dispersed on the powder surface, preventing the organic copper complexes from agglomerating. Ultimately, the Cu element after decomposition of the organic copper complex is evenly distributed at the grain boundaries, and the Cu concentration at the grain boundaries is substantially consistent with the Cu concentration within the grains, thereby avoiding the phenomenon of copper depletion at the grain boundaries.

[0018] In the present invention, preferably, the mass percentage of the plasticizer to the additive is 0.5%, 0.8% or 1%.

[0019] In the present invention, the organic solvent can be a conventional organic solvent in the art, preferably one or more of acetone, toluene, mineral oil, methyl acetate, 120# solvent oil, isooctane, isopropyl alcohol, chloroform and methyl methacrylate, more preferably one or more of 120# solvent oil, toluene, mineral oil, acetone, isooctane and isopropyl alcohol, for example, a mixed solvent of 120# solvent oil, toluene, mineral oil, isooctane and isopropyl alcohol, or a mixed solvent of acetone and isopropyl alcohol.

[0020] In the present invention, preferably, the mass percentage of the organic solvent to the additive is 69% to 79.5%.

[0021] In the present invention, preferably, the additive consists of 20% to 30% of an organic copper complex, 0.5% to 1% of a plasticizer and 69% to 79.5% of an organic solvent.

[0022] The present invention also provides a method for preparing the additive as described above, comprising the following steps:

[0023] The organic copper complex, the plasticizer and the organic solvent are mixed.

[0024] The present invention also provides a use of the aforementioned additive in the preparation of samarium-cobalt magnets. The additive has lubricating and grain boundary control effects on samarium-cobalt magnets, can improve the copper-poor phenomenon at grain boundaries, and improve the remanence, coercivity, and squareness of the magnets.

[0025] The present invention also provides a method for preparing a 2-17 type samarium cobalt magnet, the steps of which include: mixing samarium cobalt magnet alloy powder with the additives as described above, and then forming, sintering and aging;

[0026] The mass percentage of Cu element in the organic copper complex in the samarium-cobalt magnet alloy powder is 0.1-0.2%.

[0027] In the present invention, preferably, the raw materials of the samarium-cobalt magnet alloy powder include Sm, Cu, Fe, Zr and Co.

[0028] Preferably, the mass percentage of Sm in the raw material of the samarium-cobalt magnet alloy powder is 24% to 26%, for example, 24%, 25.5% or 26%.

[0029] Preferably, the mass percentage of Cu in the raw material of the samarium-cobalt magnet alloy powder is 4% to 6%, for example, 4%, 5.5% or 6%.

[0030] Preferably, the mass percentage of Fe in the raw materials of the samarium-cobalt magnet alloy powder is 10% to 20%, for example, 10%, 17%, 19% or 20%.

[0031] Preferably, the mass percentage of Zr in the raw materials of the samarium-cobalt magnet alloy powder is 2.0% to 4%, for example, 2.0%, 3.5% or 4%.

[0032] Preferably, the mass percentage of Co in the raw material of the samarium-cobalt magnet alloy powder is 45% to 60%, for example, 46%, 48%, 51.5% or 56%.

[0033] In a preferred embodiment of the present invention, the samarium-cobalt magnet alloy powder consists of 24% Sm, 4% Cu, 17% Fe, 3.5% Zr and 51.5% Co.

[0034] In a preferred embodiment of the present invention, the samarium-cobalt magnet alloy powder consists of 25.5% Sm, 5.5% Cu, 19% Fe, 2% Zr and 48% Co.

[0035] In a preferred embodiment of the present invention, the samarium-cobalt magnet alloy powder consists of 26% Sm, 4% Cu, 10% Fe, 4% Zr and 56% Co.

[0036] In a preferred embodiment of the present invention, the samarium-cobalt magnet alloy powder consists of 24% Sm, 6% Cu, 20% Fe, 4% Zr and 46% Co.

[0037] Preferably, the samarium-cobalt magnet alloy powder is obtained by smelting and crushing the raw materials of the samarium-cobalt magnet alloy powder.

[0038] Preferably, the smelting adopts a belt casting method, centrifugal casting or ingot casting method.

[0039] Preferably, the crushing includes coarse crushing, secondary crushing and fine crushing; the coarse crushing is preferably jaw crushing; the secondary crushing is preferably a disc mill or a medium crusher; the fine crushing is preferably a jet mill or a ball mill.

[0040] Preferably, the particle size D50 of the samarium-cobalt magnet alloy powder is 4 to 6 microns.

[0041] Preferably, the samarium-cobalt magnet alloy powder is dried after being mixed with the additive to remove a large amount of solvent before being formed, sintered, and aged. The drying preferably involves placing the powder in a dryer at 80° C. for 5-10 hours, for example, 5, 6, 6.5, 7, 7.5, 8, or 10 hours.

[0042] In the present invention, preferably, the mass percentage of the Cu element in the organic copper complex in the samarium cobalt magnet alloy powder is 0.1%, 0.12%, 0.14%, 0.16%, 0.18% or 0.2%, and the amount of the additive added is determined according to the copper content of the selected substance and the solution concentration.

[0043] In a preferred embodiment of the present invention, the additive consists of 25% copper naphthenate, 0.50% epoxidized soybean oil and 74.5% 120# solvent oil; the mass percentage of the additive in the samarium cobalt magnet alloy powder is preferably 2.5%.

[0044] In a preferred embodiment of the present invention, the additive consists of 30% copper oleate, 0.50% epoxidized soybean oil and 69.5% 120# solvent oil; the mass percentage of the additive in the samarium cobalt magnet alloy powder is preferably 3.3%.

[0045] In a preferred embodiment of the present invention, the additive consists of 30% copper hexadecanoate, 0.50% dibutyl phthalate and 69.5% 120# solvent oil; the mass percentage of the additive in the samarium cobalt magnet alloy powder is preferably 3.6%.

[0046] In a preferred embodiment of the present invention, the additive consists of 27% copper N,N-di-n-butyldithiocarbamate, 0.50% dibutyl phthalate and 72.5% toluene; the mass percentage of the additive in the samarium cobalt magnet alloy powder is preferably 3.3%.

[0047] In a preferred embodiment of the present invention, the additive consists of 25% copper dihexyl dithiophosphate, 0.80% epoxidized soybean oil and 74.2% toluene; the mass percentage of the additive in the samarium cobalt magnet alloy powder is preferably 3.4%.

[0048] In a preferred embodiment of the present invention, the additive consists of 22% of dibutyl copper dithiophosphate, 0.80% of dioctyl phthalate and 77.2% of mineral oil; the mass percentage of the additive in the samarium cobalt magnet alloy powder is preferably 2.4%.

[0049] In a preferred embodiment of the present invention, the additive consists of 23% T541, 0.80% dioctyl phthalate and 76.2% mineral oil; the mass percentage of the additive in the samarium cobalt magnet alloy powder is preferably 3.5%.

[0050] In a preferred embodiment of the present invention, the additive consists of 20% copper acetylacetonate, 1% epoxidized soybean oil, 40% isooctane and 39% isopropyl alcohol; the mass percentage of the additive in the samarium cobalt magnet alloy powder is preferably 3.7%.

[0051] In a preferred embodiment of the present invention, the additive consists of 23% copper acetylacetate, 1% epoxidized soybean oil, 40% acetone and 36% isopropyl alcohol; the mass percentage of the additive in the samarium cobalt magnet alloy powder is preferably 4.4%.

[0052] In a preferred embodiment of the present invention, the additive consists of 20% copper hexadecanoate, 1% epoxidized soybean oil, 40% isooctane and 39% isopropyl alcohol; the mass percentage of the additive in the samarium cobalt magnet alloy powder is preferably 8.1%.

[0053] In a preferred embodiment of the present invention, the additive consists of 23% copper oleate, 1% epoxidized soybean oil, 40% acetone and 36% isopropyl alcohol; the mass percentage of the additive in the samarium cobalt magnet alloy powder is preferably 8.7%.

[0054] In the present invention, the molding operation and conditions may be conventional in the art, and preferably, the oriented compression molding is performed in a constant magnetic field.

[0055] Preferably, the forming magnetic field strength B is 1.5-2T.

[0056] In the present invention, the sintering operation and conditions may be conventional in the art.

[0057] Preferably, the sintering is performed in an inert atmosphere.

[0058] Preferably, the sintering temperature is 1200-1220°C, for example, 1200, 1210, 1215 or 1220°C.

[0059] Preferably, the sintering time is 1 to 5 hours, for example, 1, 3, 4 or 5 hours.

[0060] In the present invention, preferably, solid solution is further performed after the sintering.

[0061] Preferably, the solid solution temperature is 1140-1190°C, for example, 1140, 1150, 1160 or 1190°C.

[0062] Preferably, the solid solution time is 5 to 40 hours, for example, 5 hours, 20 hours, 35 hours or 40 hours.

[0063] In the present invention, the aging operation and conditions may be conventional in the art.

[0064] Preferably, the aging is carried out by keeping the temperature at 800-900°C (e.g., 810°C, 840°C, 860°C or 900°C) for 5-20h (e.g., 5, 15 or 20h), then cooling the temperature to 400°C and keeping the temperature for 5-10h (e.g., 5, 6, 7 or 10h).

[0065] Preferably, the cooling is performed at a rate of 0.7°C / min.

[0066] The present invention also provides a 2-17 type samarium cobalt magnet, which is prepared by the above-mentioned preparation method of the 2-17 type samarium cobalt magnet.

[0067] The present invention also provides a 2-17 type samarium cobalt magnet, wherein the Cu concentration at the grain boundary of the 2-17 type samarium cobalt magnet is substantially consistent with the Cu concentration in the grains.

[0068] In the present invention, preferably, the Cu concentration at the grain boundary of the 2-17 type samarium cobalt magnet is 3-5.6%; the Cu concentration within the grains of the 2-17 type samarium cobalt magnet is 3.2-6%, the percentage is atomic percentage, and the Cu concentration within the grain and at the grain boundary is uniformly distributed.

[0069] On the basis of conforming to the common sense in this field, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0070] The reagents and raw materials used in the present invention are commercially available.

[0071] The positive progress effect of the present invention is:

[0072] The method of controlling grain boundaries using an organic copper complex additive is simple to operate, requires no additional processing steps, and has no specific requirements for product shape and size, making it suitable for mass production. The resulting product has comparable remanence to conventional methods, but with improved coercivity by 5-10 kOe, Hk by 1-4 kOe, and squareness of 60-75%. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Figure 1 Magnetic property comparison curve of samples of Example 4 and Comparative Example 4.

[0074] Figure 2 This is a scanning diagram of the Cu element distribution at the grain boundary of the sample of Comparative Example 4.

[0075] Figure 3 This is a scanning diagram of the Cu element distribution at the grain boundary of the sample in Example 4.

[0076] Figure 4 This is a line scan diagram of the Cu element concentration at the grain boundary of the sample of Comparative Example 4.

[0077] Figure 5 This is a line scan diagram of the Cu element concentration at the grain boundary of the sample in Example 4. DETAILED DESCRIPTION

[0078] The present invention is further illustrated by way of examples below, but the present invention is not limited to the scope of the examples. Experimental methods in the following examples where specific conditions are not specified were performed according to conventional methods and conditions, or selected according to the product specifications.

[0079] Example 1

[0080] (1) The raw materials of the samarium-cobalt magnet alloy powder shown in Table 1 were melted and crushed to obtain samarium-cobalt magnet alloy powder. The particle size D50 of the samarium-cobalt magnet alloy powder was 4 to 6 μm.

[0081] Among them, smelting adopts the belt throwing method, centrifugal casting or ingot casting method; crushing is coarse crushing, secondary crushing and fine crushing in sequence; coarse crushing is jaw crushing; secondary crushing is disc grinding or crushing by medium crusher; fine crushing is air flow grinding.

[0082] (2) The samarium-cobalt magnet alloy powder obtained in step (1) is mixed with the additives shown in Table 2 and dried in a dryer under a 99.99% N2 atmosphere at a temperature of 80°C for the time shown in Table 1. Molding, sintering, and aging are then performed. The amount of additive added is determined based on the set effective Cu addition amount (the mass percentage of the Cu element in the organic copper complex in the samarium-cobalt magnet alloy powder) and the solution concentration, as shown in Table 1.

[0083] Fine crushing is performed by air jet milling or ball milling. Oriented compaction is performed in a constant magnetic field. The magnetic field intensity, sintering temperature and time, solution temperature and time, and aging procedures are shown in Table 3. The cooling rate during aging is 0.7°C / min.

[0084] Table 1 Raw materials of samarium-cobalt magnet alloy powder in various embodiments and comparative examples

[0085]

[0086]

[0087] Table 2 Components and their mass percentages in the additives of each embodiment and comparative example

[0088]

[0089]

[0090] Table 3 Parameters of molding, sintering, solutionizing and aging of each embodiment and comparative example

[0091]

[0092] Examples 2 to 11, Comparative Examples 1 to 10

[0093] After preparing samarium-cobalt magnet alloy powder raw materials and additives according to the raw material formulas shown in Tables 1 and 2, except for the operating parameters shown in Table 3, other process conditions are the same as those in Example 1.

[0094] The additives in Comparative Examples 1 to 4 only contain lubricants and organic solvents; the additives in Comparative Examples 5 to 7 only contain organic copper complexes; and the additive in Comparative Example 10 only contains organic copper complexes and organic solvents.

[0095] Effect embodiment

[0096] The remanence Br, intrinsic coercivity Hcj, knee point Hk, squareness Hk / Hcj and maximum energy product (BH)max in the embodiments of the present invention and the comparative examples were tested for magnetic properties using a pulsed magnetic field meter PFM. The results are shown in Table 4.

[0097] Table 4 Magnetic properties data of various embodiments and comparative examples

[0098] Br(kGs) Hcj(kOe) Hk(kOe) Hk / Hcj (%) BHmax(MGOe) Example 1 11.52 32.44 19.47 60.00 32.88 Example 2 11.53 33.01 19.89 60.25 32.92 Example 3 11.60 34.56 21.55 62.36 33.02 Example 4 11.94 26.23 16.98 64.74 33.14 Example 5 11.93 26.85 17.79 66.26 33.25 Example 6 11.93 27.88 18.56 66.57 33.52 Example 7 10.04 29.88 21.51 72 24.55 Example 8 10.05 32.25 23.86 74 25.24 Example 9 12.16 27.53 20.65 75 34.71 Example 10 10.02 30.25 20.82 68.8 24.84 Example 11 12.11 25.93 18.75 72.3 34.33 Comparative Example 1 11.48 23.88 14.52 60.80 31.52 Comparative Example 2 11.49 23.91 14.66 61.31 31.61 Comparative Example 3 11.52 24.62 14.63 59.42 31.58 Comparative Example 4 11.93 22.56 12.20 54.08 33.02 Comparative Example 5 11.86 24.21 12.18 50.31 32.84 Comparative Example 6 11.87 24.56 12.14 49.43 32.86 Comparative Example 7 9.98 21.89 12.24 55.92 24.01 Comparative Example 8 9.84 24.15 13.32 55.16 23.71 Comparative Example 9 12.01 11.52 3.01 26.1 27.94 Comparative Example 10 12.03 21.36 11.75 55 33.21

[0099] like Figures 1 to 5As shown, in the sample of Example 4, the Cu element is evenly distributed at the grain boundaries, and the Cu concentration at the grain boundaries is essentially the same as that within the grains, thus avoiding the phenomenon of copper depletion at the grain boundaries. Compared with the conventional method, the product performance of the samples of each example is basically equivalent to that of the conventional method, with an increase in coercivity of 5-10 kOe, an increase in Hk of 1-4 kOe, and a squareness of 60-75%.

Claims

1. A method for preparing a 2-17 type samarium cobalt magnet, characterized in that: The method comprises the following steps: mixing samarium cobalt magnet alloy powder with additives, and then forming, sintering and aging; The additives are calculated by mass percentage and include: 20% to 30% of an organic copper complex, 0.5% to 1% of a plasticizer and an organic solvent, and the sum of the mass percentages of the components is 100%; The organic copper complex is an oil-soluble substance, the mass percentage of Cu element in the organic copper complex is greater than 10%, and the organic copper complex contains a polar group and / or an alkyl chain with 3 or more carbon atoms; The mass percentage of the Cu element in the organic copper complex in the samarium-cobalt magnet alloy powder is 0.1-0.2%.

2. The method for preparing a 2-17 type samarium cobalt magnet according to claim 1, wherein: The additives meet one or more of the following conditions: (1) The polar group in the organic copper complex is one or more of a hydroxyl group, a carboxyl group, an amino group, an ester group, and an amide group; (2) The organic copper complex is one or more of a substituted carboxylate copper complex, a carboxylate copper derivative, a thiophosphate copper complex, quinoline copper, hydroxyquinoline copper, copper phthalate, thiothioate copper, copper acetylacetonate and copper acetylacetate; (3) The particle size of the organic copper complex is less than 10 μm; (4) The mass percentage of the organic copper complex to the additive is 20%, 22%, 23%, 25%, 27% or 30%; (5) The plasticizer is phthalate esters and / or epoxidized soybean oil; (6) The mass percentage of the plasticizer to the additive is 0.5%, 0.8% or 1%; (7) The organic solvent is one or more of acetone, toluene, mineral oil, methyl acetate, 120# solvent oil, isooctane, isopropyl alcohol, chloroform and methyl methacrylate; (8) The mass percentage of the organic solvent to the additive is 69% to 79.5%; and (9) the additive consists of 20% to 30% of an organic copper complex, 0.5% to 1% of a plasticizer, and 69% to 79.5% of an organic solvent.

3. The method for preparing the 2-17 type samarium cobalt magnet according to claim 2, wherein: The plasticizer is one or more of dibutyl phthalate, dioctyl phthalate and epoxidized soybean oil.

4. The method for preparing a 2-17 type samarium cobalt magnet according to claim 2, wherein: The general formula of the substituted carboxylate copper complex is [RCO2]2Cu, where R is an alkyl group, an alkynyl group, a cyclic group, an aryl group or a heteroaryl group.

5. The method for preparing a 2-17 type samarium cobalt magnet according to claim 2, wherein: The substituted carboxylate copper complex is one or more of fatty acid copper with 10 to 22 carbon atoms, styrene copper maleate, copper picolinate, copper 2-pyrazinecarboxylate, copper 2-ethylhexanoate, copper methacrylate, cuprous thiophene-2-carboxylate, copper methionine and copper tartrate.

6. The method for preparing a 2-17 type samarium cobalt magnet according to claim 5, wherein: The copper fatty acid having 10 to 22 carbon atoms is one or more of copper oleate, copper linoleate, copper stearate, copper rosinate, copper hexadecanoate, copper palmitate and copper naphthenate.

7. The method for preparing a 2-17 type samarium cobalt magnet according to claim 2, wherein: The copper carboxylate derivative is a copper thiocarboxylate derivative [R'CS2]2Cu or a copper selenocarboxylate derivative [R'CSe2]2Cu, wherein R' includes an alkyl group and an alkyl derivative; And / or, the copper thiophosphate complex is a copper complex of dialkyl dithiophosphate, the general formula of the copper complex of dialkyl dithiophosphate is (RO)2P(S)SHM, R is an alkyl or aryl group, and M includes monovalent copper and divalent copper.

8. The method for preparing a 2-17 type samarium cobalt magnet according to claim 2, wherein: The copper carboxylate derivative is copper N,N-di-n-butyldithiocarbamate and / or copper N,N-di-n-butyldiselenocarbamate.

9. The method for preparing a 2-17 type samarium cobalt magnet according to claim 2, wherein: The copper thiophosphate complex is one or more of dihexyl copper dithiophosphate, dibutyl copper dithiophosphate, copper-containing antioxidant T541 and copper-containing antioxidant T542.

10. The method for preparing a 2-17 type samarium cobalt magnet according to claim 2, wherein: The organic solvent is one or more of 120# solvent oil, toluene, mineral oil, acetone, isooctane and isopropyl alcohol.

11. The method for preparing a 2-17 type samarium cobalt magnet according to claim 10, wherein: The organic solvent is 120# solvent oil, toluene, mineral oil, a mixed solvent of isooctane and isopropyl alcohol, or a mixed solvent of acetone and isopropyl alcohol.

12. The method for preparing a 2-17 type samarium cobalt magnet according to claim 1, wherein: The preparation method of the 2-17 type samarium cobalt magnet meets one or more of the following conditions: (1) The raw materials of the samarium-cobalt magnet alloy powder include Sm, Cu, Fe, Zr and Co; (2) The samarium-cobalt magnet alloy powder is obtained by smelting and crushing the raw materials of the samarium-cobalt magnet alloy powder; (3) The particle size D50 of the samarium-cobalt magnet alloy powder is 4 to 6 microns; and (4) the samarium-cobalt magnet alloy powder is mixed with the additive and then dried, and then molded, sintered and aged.

13. The method for preparing a 2-17 type samarium cobalt magnet according to claim 12, wherein: The mass percentage of Sm in the raw materials of the samarium-cobalt magnet alloy powder is 24%-26%; and / or, the mass percentage of Cu in the raw material of the samarium-cobalt magnet alloy powder is 4% to 6%; and / or, the mass percentage of Fe in the raw material of the samarium-cobalt magnet alloy powder is 10% to 20%; and / or, the mass percentage of Zr in the raw material of the samarium-cobalt magnet alloy powder is 2.0% to 4%; And / or, the mass percentage of Co in the raw materials of the samarium-cobalt magnet alloy powder is 45% to 60%.

14. The method for preparing a 2-17 type samarium cobalt magnet according to claim 13, wherein: The mass percentage of Sm in the raw material of the samarium-cobalt magnet alloy powder is 24%, 25.5% or 26%; and / or, the mass percentage of Cu in the raw material of the samarium-cobalt magnet alloy powder is 4%, 5.5% or 6%; and / or, the mass percentage of Fe in the raw material of the samarium-cobalt magnet alloy powder is 10%, 17%, 19% or 20%; and / or, the mass percentage of Zr in the raw material of the samarium-cobalt magnet alloy powder is 2.0%, 3.5% or 4%; And / or, the mass percentage of Co in the raw material of the samarium-cobalt magnet alloy powder is 46%, 48%, 51.5% or 56%.

15. The method for preparing a 2-17 type samarium cobalt magnet according to claim 12, wherein: The preparation method of the 2-17 type samarium cobalt magnet meets one or more of the following conditions: (1) The samarium cobalt magnet alloy powder consists of 24% Sm, 4% Cu, 17% Fe, 3.5% Zr and 51.5% Co; Alternatively, the samarium cobalt magnet alloy powder consists of 25.5% Sm, 5.5% Cu, 19% Fe, 2% Zr and 48% Co; Alternatively, the samarium cobalt magnet alloy powder consists of 26% Sm, 4% Cu, 10% Fe, 4% Zr and 56% Co; Alternatively, the samarium cobalt magnet alloy powder consists of 24% Sm, 6% Cu, 20% Fe, 4% Zr and 46% Co; (2) The smelting is carried out by a belt casting method, a centrifugal casting method or an ingot casting method; (3) The crushing includes coarse crushing, secondary crushing and fine crushing; The drying step (4) is to place the powder in a dryer and dry it at 80° C. for 5-10 hours.

16. The method for preparing a 2-17 type samarium cobalt magnet according to claim 15, wherein: The coarse crushing is jaw crushing; And / or, the secondary crushing is performed by a disc mill or a secondary crusher; And / or, the fine crushing is air jet milling or ball milling.

17. The method for preparing a 2-17 type samarium cobalt magnet according to claim 15, wherein: The drying time is 5, 6, 6.5, 7, 7.5, 8 or 10 hours.

18. The method for preparing a 2-17 type samarium cobalt magnet according to claim 1, wherein: The preparation method of the 2-17 type samarium cobalt magnet meets one or more of the following conditions: (1) The mass percentage of Cu element in the organic copper complex in the samarium cobalt magnet alloy powder is 0.1%, 0.12%, 0.14%, 0.16%, 0.18% or 0.2%; (2) The additive consists of 25% copper naphthenate, 0.50% epoxidized soybean oil and 74.5% 120# solvent oil; Alternatively, the additive consists of 30% copper oleate, 0.50% epoxidized soybean oil and 69.5% 120# solvent oil; Alternatively, the additive consists of 30% copper hexadecanoate, 0.50% dibutyl phthalate and 69.5% 120# solvent oil; Alternatively, the additive consists of 27% copper N,N-di-n-butyldithiocarbamate, 0.50% dibutyl phthalate, and 72.5% toluene; Alternatively, the additive consists of 25% copper dihexyl dithiophosphate, 0.80% epoxidized soybean oil, and 74.2% toluene; Alternatively, the additive consists of 22% copper dibutyl dithiophosphate, 0.80% dioctyl phthalate, and 77.2% mineral oil; Alternatively, the additive consists of 23% T541, 0.80% dioctyl phthalate, and 76.2% mineral oil; Alternatively, the additive consists of 20% copper acetylacetonate, 1% epoxidized soybean oil, 40% isooctane, and 39% isopropyl alcohol; Alternatively, the additive consists of 23% copper acetylacetate, 1% epoxidized soybean oil, 40% acetone, and 36% isopropyl alcohol; Alternatively, the additive consists of 20% copper hexadecanoate, 1% epoxidized soybean oil, 40% isooctane, and 39% isopropyl alcohol; Alternatively, the additive consists of 23% copper oleate, 1% epoxidized soybean oil, 40% acetone, and 36% isopropyl alcohol.

19. The method for preparing a 2-17 type samarium cobalt magnet according to claim 18, wherein: The additive is composed of 25% copper naphthenate, 0.50% epoxidized soybean oil and 74.5% 120# solvent oil, and the mass percentage of the additive in the samarium cobalt magnet alloy powder is 2.5%; Alternatively, the additive consists of 30% copper oleate, 0.50% epoxidized soybean oil and 69.5% 120# solvent oil, and the additive accounts for 3.3% of the mass percentage of the samarium cobalt magnet alloy powder; Alternatively, the additive is composed of 30% copper hexadecanoate, 0.50% dibutyl phthalate and 69.5% 120# solvent oil, and the mass percentage of the additive in the samarium cobalt magnet alloy powder is 3.6%; Alternatively, the additive consists of 27% copper N,N-di-n-butyldithiocarbamate, 0.50% dibutyl phthalate and 72.5% toluene, and the mass percentage of the additive in the samarium cobalt magnet alloy powder is 3.3%; Alternatively, the additive consists of 25% copper dihexyl dithiophosphate, 0.80% epoxidized soybean oil and 74.2% toluene, and the mass percentage of the additive in the samarium cobalt magnet alloy powder is 3.4%; Alternatively, the additive consists of 22% of dibutyl copper dithiophosphate, 0.80% of dioctyl phthalate and 77.2% of mineral oil, and the mass percentage of the additive in the samarium cobalt magnet alloy powder is 2.4%; Alternatively, the additive consists of 23% T541, 0.80% dioctyl phthalate and 76.2% mineral oil, and the additive accounts for 3.5% by mass of the samarium cobalt magnet alloy powder; Alternatively, the additive consists of 20% copper acetylacetonate, 1% epoxidized soybean oil, 40% isooctane, and 39% isopropyl alcohol, and the mass percentage of the additive in the samarium cobalt magnet alloy powder is 3.7%; Alternatively, the additive consists of 23% copper acetylacetate, 1% epoxidized soybean oil, 40% acetone, and 36% isopropyl alcohol, and the mass percentage of the additive in the samarium cobalt magnet alloy powder is 4.4%; Alternatively, the additive consists of 20% copper hexadecanoate, 1% epoxidized soybean oil, 40% isooctane, and 39% isopropyl alcohol, and the mass percentage of the additive in the samarium cobalt magnet alloy powder is 8.1%; Alternatively, the additive consists of 23% copper oleate, 1% epoxidized soybean oil, 40% acetone and 36% isopropyl alcohol, and the additive accounts for 8.7% by mass of the samarium cobalt magnet alloy powder.

20. The method for preparing a 2-17 type samarium cobalt magnet according to claim 1, wherein: The preparation method of the 2-17 type samarium cobalt magnet meets one or more of the following conditions: (1) The magnetic field intensity B of the molding is 1.5~2T; (2) The sintering is carried out in an inert atmosphere; (3) The sintering temperature is 1200-1220°C; (4) The sintering time is 1 to 5 hours; (5) after the sintering, solid solution is also carried out; The aging process described in (6) is to keep the temperature at 800-900°C for 5-20 hours, then cool the temperature to 400°C and keep the temperature for 5-10 hours.

21. The method for preparing a 2-17 type samarium cobalt magnet according to claim 20, wherein: The sintering temperature is 1200, 1210, 1215 or 1220°C; And / or, the sintering time is 1, 3, 4 or 5 hours; And / or, the solid solution temperature is 1140-1190°C; And / or, the solution treatment time is 5 to 40 hours; And / or, the cooling is performed at a rate of 0.7°C / min.

22. The method for preparing a 2-17 type samarium cobalt magnet according to claim 21, wherein: The solid solution temperature is 1140, 1150, 1160 or 1190°C; And / or, the solid solution time is 5h, 20h, 35h or 40h.

23. A 2-17 type samarium cobalt magnet, characterized in that The magnet is prepared by the method for preparing the 2-17 type samarium cobalt magnet according to any one of claims 1 to 22.

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