CN112349470A - Injection molding magnet material, injection molding magnet and preparation method thereof - Google Patents
Injection molding magnet material, injection molding magnet and preparation method thereof Download PDFInfo
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- CN112349470A CN112349470A CN202011225692.1A CN202011225692A CN112349470A CN 112349470 A CN112349470 A CN 112349470A CN 202011225692 A CN202011225692 A CN 202011225692A CN 112349470 A CN112349470 A CN 112349470A
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 100
- 238000002360 preparation method Methods 0.000 title abstract description 16
- 239000000945 filler Substances 0.000 claims abstract description 42
- 239000007822 coupling agent Substances 0.000 claims abstract description 37
- 239000002994 raw material Substances 0.000 claims abstract description 34
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- 239000006247 magnetic powder Substances 0.000 claims abstract description 26
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- 239000007924 injection Substances 0.000 claims description 12
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- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 150000004645 aluminates Chemical class 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
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- 239000005642 Oleic acid Substances 0.000 description 5
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- 230000001070 adhesive effect Effects 0.000 description 5
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- 238000011160 research Methods 0.000 description 5
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- 230000007613 environmental effect Effects 0.000 description 3
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- 150000002148 esters Chemical class 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 229960001545 hydrotalcite Drugs 0.000 description 2
- 229910001701 hydrotalcite Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
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- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical group [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- HPEUJPJOZXNMSJ-UHFFFAOYSA-N Methyl stearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC HPEUJPJOZXNMSJ-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 1
- -1 and further Substances 0.000 description 1
- AGXUVMPSUKZYDT-UHFFFAOYSA-L barium(2+);octadecanoate Chemical compound [Ba+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O AGXUVMPSUKZYDT-UHFFFAOYSA-L 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000012975 dibutyltin dilaurate Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005293 ferrimagnetic effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- OCWMFVJKFWXKNZ-UHFFFAOYSA-L lead(2+);oxygen(2-);sulfate Chemical compound [O-2].[O-2].[O-2].[Pb+2].[Pb+2].[Pb+2].[Pb+2].[O-]S([O-])(=O)=O OCWMFVJKFWXKNZ-UHFFFAOYSA-L 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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- 239000004033 plastic Substances 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
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- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
- NCPXQVVMIXIKTN-UHFFFAOYSA-N trisodium;phosphite Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])[O-] NCPXQVVMIXIKTN-UHFFFAOYSA-N 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- H01F1/10—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
- H01F1/11—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
- H01F1/113—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
-
- 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
Abstract
The invention relates to an injection molding magnet material, an injection molding magnet and a preparation method thereof, wherein the injection molding magnet material is mainly prepared from the following raw materials in percentage by weight: 80% -92% of magnetic powder; 4.5 to 8 percent of binder; 0.3 to 2 percent of coupling agent; 0.2 to 4 percent of additive; 0.05 to 6 percent of lamellar filler. The invention pertinently adds the layered filler as the raw material component, and ensures that the injection molding magnet has high dimensional stability in a high-temperature and high-humidity environment while meeting the processing performance and mechanical strength of the magnet by adjusting the adding proportion of the raw material component, and the preparation method is simple.
Description
Technical Field
The invention relates to the technical field of injection molding permanent magnet materials, and particularly relates to an injection molding magnet material, an injection molding magnet and a preparation method thereof.
Background
Injection molded magnets are widely used in various electrical and electronic products because they can be processed into complex shapes with high precision. The injection molding magnet is produced by mixing and granulating a thermoplastic binder and magnetic powder and using an injection molding method, and the binder has to reach a certain content in order to meet the processing performance and the mechanical strength of the magnet.
The thermoplastic binder commonly used in the prior art is PA6 due to the low cost of PA6, but the thermoplastic binder is a plastic containing hydrophilic groups, the water absorption rate is high, the water absorption expansion of the material is accelerated at high temperature, and therefore the dimensional change is large and the dimensional instability is caused under the high-temperature and high-humidity environment, so that the normal use of the magnet is influenced.
At present, the dimensional stability of the magnet under a high-temperature and high-humidity environment is mainly controlled by selecting a binder PA12 or PPS which has low water absorption rate and good dimensional stability. However, the binder having low water absorption and high dimensional stability is expensive and not easy to mold.
Disclosure of Invention
The invention aims to: the injection molding magnet material, the injection molding magnet and the preparation method thereof are provided, aiming at the technical problems that the thermoplastic binder for preparing the injection molding magnet in the prior art has high water absorption rate, the dimension change of the injection molding magnet is easily caused under the high-temperature and high-humidity environment to influence the use, or the thermoplastic binder with low water absorption rate is expensive and is not easy to form and process, the injection molding magnet prepared by the injection molding magnet material meets the processing performance and the mechanical strength of the magnet, and simultaneously, the injection molding magnet is ensured to have high dimension stability under the high-temperature and high-humidity environment, the raw material cost is low, and the preparation method.
In order to achieve the purpose, the invention adopts the technical scheme that:
an injection molding magnet material is mainly prepared from the following raw materials in percentage by weight:
80% -92% of magnetic powder; 4.5 to 8 percent of binder; 0.3 to 2 percent of coupling agent; 0.2 to 4 percent of additive; 0.05 to 6 percent of lamellar filler.
The injection molding magnet material provided by the invention is mainly prepared from the raw material components of magnetic powder, a binder, a coupling agent, an additive and a layered filler, the layered filler is pertinently added as the raw material component, the layered filler can increase the motion resistance of a macromolecular chain of the binder and prevent water absorption expansion, so that the product size stability of the magnet in a high-temperature and high-humidity environment is improved, and the thermal stability of the material is improved. By adjusting the adding proportion of the raw material components, the prepared injection molding magnet meets the processing performance, mechanical strength and magnetic performance of the magnet, and meanwhile, the injection molding magnet is ensured to have high dimensional stability in a high-temperature and high-humidity environment. In addition, the raw material cost is low, the preparation method is simple, and the industrial popularization is facilitated.
Further, the weight percentage of the lamellar filler is 0.5-3%. Through a large amount of experimental researches of the inventor, the weight percentage of the layered filler has a close relation with the performance of an injection molding magnet product, and researches show that the dimensional stability is influenced and worsened when the weight percentage of the layered filler is too small; too large a weight percentage of the layered filler may reduce the flowability of the material and affect the strength of the magnet product. More preferably, the weight percentage of the lamellar filler is 0.5 to 2%.
Further, the magnetic powder is a ferrous and ferromagnetic substance. Further, the magnetic powder is ferrite.
Further, the layered filler is one or more of hydrotalcite layered materials, montmorillonite, layered tetravalent metal insoluble salts, layered metal sulfides, mica and graphite.
Further, the layered filler is inorganic non-ferromagnetic or inorganic non-ferrimagnetic.
Further, the adhesive is a nylon material, and further, the adhesive is PA 6.
Further, the coupling agent is one or more of titanate coupling agent, aluminate coupling agent, silane coupling agent, phosphate coupling agent and zirconate coupling agent.
Further, the additives include a heat stabilizer and a lubricant. Further, 0.05% -2% of the heat stabilizer; 0.15 to 2 percent of lubricant. Further, the heat stabilizer is one or more of basic lead salts, polybasic esters, metal soaps and organic tin. Further, the lubricant is one or more of stearic acid, amide, ester, alcohol, wax and oleic acid. Heat stabilizers and lubricants can sometimes be an additive that has two effects. The heat stabilizer mainly prevents the binder from high-temperature decomposition and failure in the processing or using process.
The invention also aims to provide a preparation method of the injection molding magnet material.
A preparation method of an injection molding magnet material comprises the following steps:
step 1, dissolving a coupling agent in a diluent, mixing, spraying the coupling agent in magnetic powder under a stirring condition, mixing, drying in vacuum, and cooling to room temperature to obtain a first material;
step 2, adding the binder and the layered filler into the first material obtained in the step 1, and stirring and mixing; obtaining a second material;
step 3, adding an additive into the second material obtained in the step 2, and stirring and mixing to obtain a third material;
and 4, extruding and granulating the third material obtained in the step 3 at 220-280 ℃ to obtain the injection molding magnet material.
The injection molding magnet material provided by the invention is low in raw material cost, simple in preparation method and convenient for industrial popularization.
Further, in the step 1, the diluent is water, ethanol, isopropanol, liquid paraffin or solvent oil.
Further, in the step 4, a twin-screw extruder is used for extrusion granulation.
Further, in the step 4, the third material is extruded and granulated at a temperature of 250-280 ℃. Researches find that the temperature has a direct relation with the final performance of the product, the temperature is too low, the material cannot reach the processing performance, and the temperature is too high, so the strength of the material is influenced. Preferably, the third material is extruded and granulated at 250-260 ℃.
The invention also aims to provide an injection molded magnet prepared from the injection molded magnet material.
An injection molding magnet prepared by the injection molding magnet material.
According to the injection molding magnet, the layered filler is added as the raw material component in a targeted manner, and the addition proportion of the raw material component is adjusted, so that the prepared injection molding magnet meets the processing performance, the mechanical strength and the magnetic performance of the magnet, and the high dimensional stability of the injection molding magnet in a high-temperature and high-humidity environment is ensured. The raw material cost is low.
The invention also provides a preparation method of the injection molding magnet.
A preparation method of an injection molding magnet comprises the following steps:
and step S1, carrying out injection molding on the injection molding magnet material through an injection molding machine to obtain the injection molding magnet.
According to the injection molding magnet, the layered filler is added as the raw material component in a targeted manner, and the addition proportion of the raw material component is adjusted, so that the prepared injection molding magnet meets the processing performance, the mechanical strength and the magnetic performance of the magnet, and the high dimensional stability of the injection molding magnet in a high-temperature and high-humidity environment is ensured. The raw material cost is low, the preparation method is simple, and the industrial popularization is facilitated.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the injection molding magnet material provided by the invention is mainly prepared by taking magnetic powder, a binder, a coupling agent, an additive and a layered filler as raw material components, the layered filler is specifically added as the raw material components, and the addition proportion of the raw material components is adjusted, so that the prepared injection molding magnet meets the processing performance, the mechanical strength and the magnetic performance of the magnet, and the high dimensional stability of the injection molding magnet in a high-temperature and high-humidity environment is ensured.
2. The layered filler is added into the raw materials of the injection molding magnet material as a raw material, and can increase the motion resistance of a high molecular chain of a binder and prevent water absorption expansion, so that the product dimensional stability of the magnet in a high-temperature and high-humidity environment is improved, and the thermal stability of the material is improved.
3. The injection molding magnet provided by the invention has the advantages of low raw material cost, simple preparation method and convenience for industrial popularization.
4. After the injection molding magnet provided by the invention is stored for 100 hours at the temperature of about 80 ℃ and the relative humidity of 90-95%, the size change of the product is very small, and the change rate can be lower than 0.2%.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
An injection molding magnet material is mainly prepared from the following raw materials in percentage by weight:
90% of ferrite magnetic powder, 67.5% of binder PA, 0.5% of silane coupling agent, 0.2% of calcium stearate, 1% of oleic acid and 0.8% of montmorillonite.
Preparing an injection molding magnet:
step 1, dissolving a coupling agent in a diluent according to a certain proportion, mixing, spraying the coupling agent in magnetic powder under a stirring condition, mixing, drying in vacuum, and cooling to room temperature to obtain a first material;
step 2, adding the binder and the layered filler into the first material obtained in the step 1, and stirring and mixing; obtaining a second material;
step 3, adding a heat stabilizer and a lubricant into the second material obtained in the step 2, and stirring and mixing;
and 4, extruding and granulating the third material obtained in the step 3 at 250 ℃ to obtain the injection molding magnet material.
And 5, performing injection molding on the injection molding magnet material obtained in the step 4 to obtain an injection molding magnet.
Example 2
An injection molding magnet material is mainly prepared from the following raw materials in percentage by weight:
89% of ferrite magnetic powder, PA 68% of adhesive, 2% of aluminate coupling agent, 0.5% of barium stearate (heat stabilizer), 0.5% of sodium phosphite, 2% of EBS (lubricant) and 6% of hydrotalcite layer material.
Preparing an injection molding magnet:
step 1, dissolving a coupling agent in a diluent according to a certain proportion, mixing, spraying the coupling agent in magnetic powder under a stirring condition, mixing, drying in vacuum, and cooling to room temperature to obtain a first material;
step 2, adding the binder and the layered filler into the first material obtained in the step 1, and stirring and mixing; obtaining a second material;
step 3, adding a heat stabilizer and a lubricant into the second material obtained in the step 2, and stirring and mixing;
and 4, extruding and granulating the third material obtained in the step 3 at 220 ℃ to obtain the injection molding magnet material.
And 5, performing injection molding on the injection molding magnet material obtained in the step 4 to obtain an injection molding magnet.
Example 3
An injection molding magnet material is mainly prepared from the following raw materials in percentage by weight:
85% of ferrite magnetic powder, 67.5% of adhesive PA, 1% of phosphate coupling agent, 1% of dibutyltin dilaurate, 1% of liquid paraffin and 4.5% of mica.
Preparing an injection molding magnet:
step 1, dissolving a coupling agent in a diluent according to a certain proportion, mixing, spraying the coupling agent in magnetic powder under a stirring condition, mixing, drying in vacuum, and cooling to room temperature to obtain a first material;
step 2, adding the binder and the layered filler into the first material obtained in the step 1, and stirring and mixing; obtaining a second material;
step 3, adding a heat stabilizer and a lubricant into the second material obtained in the step 2, and stirring and mixing;
and 4, extruding and granulating the third material obtained in the step 3 at 280 ℃ to obtain the injection molding magnet material.
And 5, performing injection molding on the injection molding magnet material obtained in the step 4 to obtain an injection molding magnet.
Example 4
An injection molding magnet material is mainly prepared from the following raw materials in percentage by weight:
91% of ferrite magnetic powder, PA 67% of adhesive, 1.75% of titanate coupling agent, 0.05% of tribasic lead sulfate (heat stabilizer), 0.15% of methyl monostearate (lubricant) and 0.05% of molybdenum disulfide.
Preparing an injection molding magnet:
step 1, dissolving a coupling agent in a diluent according to a certain proportion, mixing, spraying the coupling agent in magnetic powder under a stirring condition, mixing, drying in vacuum, and cooling to room temperature to obtain a first material;
step 2, adding the binder and the layered filler into the first material obtained in the step 1, and stirring and mixing; obtaining a second material;
step 3, adding a heat stabilizer and a lubricant into the second material obtained in the step 2, and stirring and mixing;
and 4, extruding and granulating the third material obtained in the step 3 at 240 ℃ to obtain the injection molding magnet material.
And 5, performing injection molding on the injection molding magnet material obtained in the step 4 to obtain an injection molding magnet.
Comparative example 1
An injection molding magnet material is mainly prepared from the following raw materials in percentage by weight:
90% of ferrite magnetic powder, 68.3% of binder PA, 0.5% of silane coupling agent, 0.2% of calcium stearate and 1% of oleic acid.
Preparing an injection molding magnet:
step 1, dissolving a coupling agent in a diluent according to a certain proportion, mixing, spraying the coupling agent in magnetic powder under a stirring condition, mixing, drying in vacuum, and cooling to room temperature to obtain a first material;
step 2, adding a binder into the first material obtained in the step 1, and stirring and mixing; obtaining a second material;
step 3, adding a heat stabilizer and a lubricant into the second material obtained in the step 2, and stirring and mixing;
and 4, extruding and granulating the third material obtained in the step 3 at 250 ℃ to obtain the injection molding magnet material.
And 5, performing injection molding on the injection molding magnet material obtained in the step 4 to obtain an injection molding magnet.
Comparative example 2
An injection molding magnet material is mainly prepared from the following raw materials in percentage by weight:
89.97% of ferrite magnetic powder, 68.3% of binder PA, 0.5% of silane coupling agent, 0.2% of calcium stearate, 1% of oleic acid and 0.03% of montmorillonite.
Preparing an injection molding magnet:
step 1, dissolving a coupling agent in a diluent according to a certain proportion, mixing, spraying the coupling agent in magnetic powder under a stirring condition, mixing, drying in vacuum, and cooling to room temperature to obtain a first material;
step 2, adding the binder and the layered filler into the first material obtained in the step 1, and stirring and mixing; obtaining a second material;
step 3, adding a heat stabilizer and a lubricant into the second material obtained in the step 2, and stirring and mixing;
and 4, extruding and granulating the third material obtained in the step 3 at 250 ℃ to obtain the injection molding magnet material.
And 5, performing injection molding on the injection molding magnet material obtained in the step 4 to obtain an injection molding magnet.
Comparative example 3
An injection molding magnet material is mainly prepared from the following raw materials in percentage by weight:
82% of ferrite magnetic powder, 68.3% of binder PA, 0.5% of silane coupling agent, 0.2% of calcium stearate, 1% of oleic acid and 8% of montmorillonite.
Preparing an injection molding magnet:
step 1, dissolving a coupling agent in a diluent according to a certain proportion, mixing, spraying the coupling agent in magnetic powder under a stirring condition, mixing, drying in vacuum, and cooling to room temperature to obtain a first material;
step 2, adding the binder and the layered filler into the first material obtained in the step 1, and stirring and mixing; obtaining a second material;
step 3, adding a heat stabilizer and a lubricant into the second material obtained in the step 2, and stirring and mixing;
and 4, extruding and granulating the third material obtained in the step 3 at 250 ℃ to obtain the injection molding magnet material.
And 5, performing injection molding on the injection molding magnet material obtained in the step 4 to obtain an injection molding magnet.
Test & test:
injection molded magnet samples of examples 1 to 4 and comparative examples 1 to 3 were produced, and dimensional change and physical properties after environmental tests were measured, and the results are shown in table 1.
Environmental test conditions: the magnet is stored for 100 hours at the temperature of 80 plus or minus 2 ℃ and the relative humidity of 90-95 percent.
The tensile strength and flexural strength of the material were tested using a universal material testing machine.
And (3) testing the melting finger of the material by using a melting finger instrument, wherein the test conditions are as follows: 270 ℃ and 10 kg.
TABLE 1 Properties of the products
From the test results of examples 1-4 in table 1, the magnetic material injection molded product prepared by using the formulation of the present invention has good magnet appearance and stable size after high temperature and high humidity environment test, can meet the use requirement of high humidity environment, and has low raw material cost and simple preparation method. After the layered inorganic filler is added, the size change of the product after an environmental test is small, the change rate is lower than 0.2%, the size stability is excellent, the fluidity of the material after the layered inorganic filler is added is reduced by about 6%, and the tensile strength and the bending strength of the material are reduced slightly compared with those of a comparative example. The dimensional stability is improved by about 85% compared to comparative example 1 for the addition of the layered filler. Research shows that the dimension stability is influenced and deteriorated when the weight percentage of the layered filler is too small; too large a weight percentage of the layered filler may reduce the flowability of the material and affect the strength of the magnet product.
Examples 5 to 10
Examples 5-10 compared to example 1, only the percentage of montmorillonite added was changed and the change in properties of the injection molded magnet product at different levels of lamellar filler was investigated, and the test results are shown in table 2.
TABLE 2 Performance test
From the experimental data in table 2, the weight percentage of the layered filler has a close relationship with the performance of the injection molding magnet product, and researches find that the improvement on the dimensional stability of the product is poor due to the fact that the weight percentage of the layered filler is too small; too large a weight percentage of the layered filler may reduce the flowability of the material, affect the strength of the magnet product, and also affect the magnetic properties to some extent. Preferably, the weight percentage of the lamellar filler is 0.5-3%. More preferably, the weight percentage of the lamellar filler is 0.5 to 2%.
The injection molding magnet particles provided by the invention are mainly prepared from the raw material components of magnetic powder, a binder, a coupling agent, an additive and a layered filler, the layered filler is specifically added as the raw material components, and the addition proportion of the raw material components is adjusted, so that the prepared injection molding magnet meets the processing performance, the mechanical strength and the magnetic performance of the magnet, and the high dimensional stability of the injection molding magnet in a high-temperature and high-humidity environment is ensured. The layered filler can increase the motion resistance of a high molecular chain of the binder and prevent water absorption expansion, thereby improving the product size stability of the magnet in a high-temperature and high-humidity environment and improving the thermal stability of the material.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An injection molding magnet material is characterized by being mainly prepared from the following raw materials in percentage by weight:
80% -92% of magnetic powder; 4.5 to 8 percent of binder; 0.3 to 2 percent of coupling agent; 0.2 to 4 percent of additive; 0.05 to 6 percent of lamellar filler.
2. An injection-molded magnet material as claimed in claim 1, wherein said layered filler is one or more of hydrotalcite-like layered material, montmorillonite, layered tetravalent metal insoluble salt, layered metal sulfide, mica and graphite.
3. An injection molded magnet material as claimed in claim 1, wherein the layered filler is present in an amount of 0.5-3% by weight.
4. An injection molded magnet material as claimed in claim 3, wherein the layered filler is present in an amount of 0.5-2% by weight.
5. An injection molded magnet material as claimed in claim 1, wherein said additives comprise a heat stabilizer and a lubricant.
6. An injection-molded magnet material as claimed in claim 5, wherein said heat stabilizer is 0.05-2%; 0.15 to 2 percent of lubricant.
7. An injection-molded magnet material as claimed in claim 1, wherein said magnetic powder is ferrite; the coupling agent is one or more of titanate coupling agent, aluminate coupling agent, silane coupling agent, phosphate coupling agent and zirconate coupling agent.
8. A method for producing an injection-molded magnet material according to any one of claims 1 to 7, comprising the steps of:
step 1, dissolving a coupling agent in a diluent according to a certain proportion, mixing, spraying the coupling agent in magnetic powder under a stirring condition, mixing, drying in vacuum, and cooling to room temperature to obtain a first material;
step 2, adding the binder and the layered filler into the first material obtained in the step 1, and stirring and mixing; obtaining a second material;
step 3, adding an additive into the second material obtained in the step 2, and stirring and mixing to obtain a third material;
and 4, extruding and granulating the third material obtained in the step 3 at 220-280 ℃ to obtain the injection molding magnet material.
9. An injection molded magnet produced using the injection molded magnet material according to any one of claims 1 to 7.
10. A method of manufacturing an injection molded magnet as claimed in claim 9, comprising the steps of:
and step S1, carrying out injection molding on the injection molding magnet material to obtain the injection molding magnet.
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| CN117487432A (en) * | 2023-11-09 | 2024-02-02 | 江苏美标家居科技有限公司 | Fireproof heat-insulating coating and preparation process thereof |
| CN117487432B (en) * | 2023-11-09 | 2024-05-03 | 江苏美标家居科技有限公司 | Fireproof heat-insulating coating and preparation process thereof |
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