WO1998054734A1 - Composition de resine - Google Patents

Composition de resine Download PDF

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Publication number
WO1998054734A1
WO1998054734A1 PCT/JP1998/002296 JP9802296W WO9854734A1 WO 1998054734 A1 WO1998054734 A1 WO 1998054734A1 JP 9802296 W JP9802296 W JP 9802296W WO 9854734 A1 WO9854734 A1 WO 9854734A1
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WO
WIPO (PCT)
Prior art keywords
powder
resin composition
soft
filler
weight
Prior art date
Application number
PCT/JP1998/002296
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English (en)
Japanese (ja)
Inventor
Masahito Tada
Keiichiro Suzuki
Original Assignee
Kureha Kagaku Kogyo K.K.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from JP15285897A external-priority patent/JPH10326707A/ja
Priority claimed from JP20219197A external-priority patent/JP3838749B2/ja
Application filed by Kureha Kagaku Kogyo K.K. filed Critical Kureha Kagaku Kogyo K.K.
Publication of WO1998054734A1 publication Critical patent/WO1998054734A1/fr

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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
    • H01F1/12—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 soft-magnetic materials
    • H01F1/34—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 soft-magnetic materials non-metallic substances, e.g. ferrites
    • H01F1/36—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 soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles
    • H01F1/37—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 soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles in a bonding agent

Definitions

  • the present invention relates to a resin composition containing a synthetic resin and a soft magnetic filler, and more particularly, to a resin having high magnetic permeability and electric insulation and excellent in withstand voltage. Composition.
  • the present invention also relates to a resin composition having a high magnetic permeability and a high level of balance between withstand voltage and saturation magnetic flux density.
  • the compounds of the ferric and divalent metal oxide, (M 0 ⁇ F e .0 3 ) is Ri large soft magnetic material der permeability, soft (Seo oice) off; t Rye Doo and call Have been broken.
  • the soft filler is manufactured by powder metallurgy and has the characteristics of being hard and lightweight.
  • the soft ferrites Ni-Zn ferrite, Mg-Zn ferrite, and Cu ferrite have high electric resistivity, so that high-frequency It has the characteristic of high magnetic permeability in the band, and its sintered body is used as a material for deflection yokes, high-frequency trans- formers, and magnetic heads.
  • Soft filaments have the disadvantage of being brittle, but taking advantage of their high electrical resistance, the soft magnetic resin composition in which the powder is dispersed as a filler in a synthetic resin is used. New applications are being developed for such applications as ark coils, oral transformers, line filters, and electromagnetic wave shielding materials (EMI shielded materials).
  • the soft magnetic resin composition is a resin composition in which a soft fly powder is dispersed in a synthetic resin.
  • Various molding methods generally used in the field of synthetic resins for example, injection molding, extrusion molding, and compression molding can be used to form a molded article having a desired shape.
  • methods for increasing the electrical resistance of a resin composition containing a synthetic resin and a soft ferrite powder include, for example, 1) Ni ferrite powder or Mg ferrite powder.
  • a method of heat-treating a molded article molded from a resin composition containing an it powder and a crystalline thermoplastic resin at a temperature equal to or higher than the glass transition point of the thermoplastic resin and lower than the melting point Japanese Patent Application Laid-Open No. 8-1-1). No. 9 901), (2) A method using a magnetic powder having an oxide layer formed on the surface (Japanese Patent Laid-Open Publication No. Hei 8-2-1326, 26), (3) A magnetic material having a specific particle size distribution A method using a powder (Japanese Patent Application Laid-Open No. Hei 9-63687) has been proposed.
  • the withstand voltage of the resin composition containing the magnetic powder can be improved from the conventional level.
  • the method (1) since the molded body is heat-treated at a high temperature for a long time, thermal deformation occurs. In some cases, the dimensional accuracy of the molded product became a problem.
  • the method (2) when the synthetic resin and the magnetic powder are melt-kneaded or molded, the magnetic powder is crushed, and the oxide layer (insulating layer) formed on the surface is destroyed. There was a problem. Therefore, it is difficult to achieve a high withstand voltage by the method (2) alone.
  • the soft magnetic resin composition in which soft ferrite powder, which is an oxide-based soft magnetic material, is dispersed in a synthetic resin does not have a sufficiently high saturation magnetic flux density. When applied, it was necessary to keep the operable current low or the operable magnetic field low.
  • a metal soft magnetic material made of a metal or an alloy generally has a high saturation magnetic flux density, but has a problem that its electric resistance is considerably lower than that of an oxide soft magnetic material.
  • gay steel sheet is widely used as a transcore, but cannot be used as it is because of its low electrical resistance, and is used with an insulating plate sandwiched between its thin plates.
  • carbonyl iron powder is used as a dust core in high-frequency inductors, its low electrical resistance makes it unsuitable for components to which high voltages are applied.
  • the Fe-Si-B alloy is mainly used in the form of a ribbon, but because of its low electrical resistance, it had to be placed in an insulating case. Therefore, a resin composition in which such a metal-based soft magnetic material is dispersed in a synthetic resin has a high dielectric strength. There was a problem that the pressure was low and the permeability was low.
  • An object of the present invention is to provide a resin composition containing a synthetic resin and a soft magnetic filler, which has high magnetic permeability and electric insulation, and is excellent in withstand voltage. To do that.
  • Another object of the present invention is a resin composition containing a synthetic resin and a soft magnetic filler, which has a high magnetic permeability, a withstand voltage (electric resistance) and a saturation magnetic flux.
  • An object of the present invention is to provide a resin composition in which the density is balanced at a high level.
  • the present inventors have conducted intensive studies to overcome the problems of the prior art, and as a result, in a resin composition containing a synthetic resin and a soft magnetic filler, the soft magnetic filler and the soft magnetic filler And at least one kind selected from the group consisting of Ni—Zn-based ferrite, Mg—Zn-based ferrite, and Cu-based ferrite.
  • a soft bright powder By using a soft bright powder and controlling the porosity of the soft bright powder within a small range, it has a moderately high magnetic permeability and a high electric insulation, and It has been found that a resin composition having a significantly improved withstand voltage can be obtained.
  • the magnetic permeability can be increased to a high level. It was found that a resin composition having both high withstand voltage and high saturation magnetic flux density can be obtained while maintaining the above conditions. Furthermore, it has been found that with this resin composition, when a low-modulus agent such as silicone oil is mixed, the withstand voltage can be maintained at a particularly high level.
  • the present invention has been completed based on these findings. You.
  • the soft magnetic filer (B) is composed of a Ni—Zn-based resin. At least one kind of soft filler powder selected from the group consisting of light, Mg—Zn-based ferrite, and Cu-based ferrite; and Further, there is provided a resin composition characterized by containing a soft ferrite powder (B1) having a porosity in the range of 0.01 to 5%.
  • the soft magnetic filler (B) in the resin composition containing the soft filler powder (B 1), may be a metal having an electrically insulating layer formed on the surface.
  • the present invention provides a resin composition further containing a magnetic powder (B 2).
  • the resin composition preferably contains a low-modulus agent (C) in order to increase both the withstand voltage and the saturation magnetic flux density to high levels.
  • polyolefins such as polyethylene and polypropylene
  • polyamides such as polyamides
  • polyolefins such as polyolefins
  • Allylene sulfide and epoxy resin are particularly preferred in view of moldability and physical properties. Heat resistance, chemical resistance, dimensional stability, machinery From the viewpoint of the target strength and the like, a polylens sulfide such as a polylens sulfide is particularly preferable.
  • a specific soft filler powder (B 1) may be used alone as the soft magnetic filler (B), or may be used as the soft magnetic filler (B 1). Use in combination with a specific metal magnetic powder (B 2).
  • Soft Fuwerai DOO is a ferric oxide (F e.0 o) and divalent metal oxide compounds of (MO) (MO ⁇ F e 2 0 3), the type of divalent metal oxides Therefore, M n —Zn system, M g —Zn system, Ni-Zn system, Cu system, Cu—Zn system, Cu—Zn—Mg system, Cu—Ni — Classified into various ferrites such as Zn-based.
  • the soft ferrite powder is selected from the group consisting of Ni—Zn ferrite, Mg—Zn ferrite, and Cu ferrite. Use at least one.
  • N i - A Z n system Fuwerai DOO refers to having the general formula (N i O) x (Z n O) y 'F e 9 ⁇ 3 represented by the composition, but a part of the N i It may be substituted with another divalent metal such as Cu, Mg, Co and Mn.
  • the Ni—Zn ferrite may be one to which other additives are added as long as the original properties are not impaired.
  • a Ni-Zn ferrite in which the content of iron oxide is adjusted is particularly preferable.
  • Mg- Z n system ferrite Bok and the general formula (Mg O) ⁇ (Z nO ) y - F e 2 ⁇ 3 refers to those having a composition represented by, but a part of M g N i, C It may be substituted with another divalent metal such as u, Co, and Mn.
  • the Mg-Zn ferrite may contain other additives as long as the original properties are not impaired.
  • Mg-Zn type fillers in which the content of iron oxide is adjusted to suppress the precipitation of hematite are particularly preferred.
  • the Cu-based filler may be one to which other additives are added as long as the original properties are not impaired.
  • a Cu-based filler in which the content of iron oxide is adjusted is particularly preferable.
  • Ni—Zn-based ferrite, Mg—Zn-based light, and Cu-based light can be synthesized by a known method.
  • Metal oxides or metal carbonates such as CuO, NiO, MgO, and ZnO.
  • Typical examples of the method for producing a soft fly include a dry method, a coprecipitation method, and a spray pyrolysis method.
  • each raw material such as a metal oxide or a metal carbonate is calculated so as to have a predetermined mixing ratio, mechanically mixed, fired, and pulverized.
  • the raw material mixture is preferably calcined, pulverized into fine particles, granulated into granules, further calcined, and then pulverized again to obtain a soft flour powder.
  • hydroxide is precipitated by adding strong force to an aqueous solution of a metal salt, and this is oxidized to obtain a fine soft powder powder.
  • the soft ferrite powder is granulated, fired, and then ground.
  • an aqueous solution of a metal salt is thermally decomposed to obtain a particulate oxide.
  • the oxide powder is granulated, fired, and then ground.
  • the baked fine powder is pulverized by a hammer mill, rod mill, ball mill, or the like, and is made into a soft ferrite powder having a desired particle size.
  • Firing at a high temperature exceeding ° C is preferred. Firing temperature is preferred Is 1200 to 135 ° C.
  • an additive that promotes the solid phase reaction is used in combination. Examples of such additives include copper compounds such as copper oxide.
  • At least one kind of soft filler selected from the group consisting of Ni—Zn ferrite, Mg—Zn ferrite, and Cu ferrite Use a soft filler powder with a porosity of 0.01 to 5%.
  • a soft ferrite powder having a porosity of more than 5% is mixed with a synthetic resin, it is difficult to obtain a resin composition having excellent withstand voltage.
  • a soft fly powder having a porosity of less than 0.01% and having substantially no voids is mixed with the synthetic resin, various additives added to the soft fly powder are lost and the It is not preferable because the synthetic resin is considered to be partially decomposed and is decomposed.
  • a soft ferrite powder whose porosity is adjusted within a limited range is used.
  • the porosity is 0.01 to 5%, preferably 0.03 to 4%, more preferably 0.05 to 3%, particularly preferred.
  • Use soft flour powder in the range of 0.1 to 2%. In many cases, the desired result can be obtained by using a soft filler powder having a porosity of 0.5 to 5%.
  • the withstand voltage of the resin composition is generally set to 250 V or more, preferably to 300 V or more. Can be done.
  • the withstand voltage of the resin composition is more preferably 350 V or more, and particularly preferably 500 V The above can be said. When the porosity is 1% or less, an excellent withstand voltage exceeding 500 V can be obtained.
  • the average particle size of the soft ferrite powder is 1 ⁇ or more and lmm or less. I prefer it. If the average particle diameter of the soft ferrite powder is too small, it is not preferable because it is difficult to obtain a sufficient magnetic permeability and the withstand voltage also decreases. On the other hand, if the average particle size of the soft filler powder is too large, the molding machine wears extremely and molding becomes difficult, which is not preferable.
  • the average particle size of the soft ferrite powder is preferably 15
  • the metal magnetic powder (B 2) used in the present invention is obtained by forming an electric insulating layer on the surface of a powdery metal soft magnetic material.
  • a powdery metal soft magnetic material As the metal-based soft magnetic material, pure iron-based and iron-based alloy-based soft magnetic materials are preferable. Examples of the pure iron-based soft magnetic material include metal powder and iron nitride powder.
  • Fe-based alloy soft magnetic materials include Fe—Si—A1 alloy (sendust) powder, super-sendust powder, Ni—Fe alloy (palmalloy) powder, and Co — Fe alloy powder, carbonyl iron powder, and 6-31-8 alloy powder. Among these, carbonyl iron powder, sendust powder, and Fe—Si—B-based alloy powder are particularly preferred from the viewpoint of productivity in producing the metal-based magnetic powder (B2).
  • the powdered metallic soft magnetic material has too low an electric resistance as it is, a resin composition having a sufficiently high electric insulating property can be obtained even when used in combination with the soft briquette powder (B1). Is difficult. Therefore, in the present invention, a metal-based magnetic powder (B 2) having an electric insulating layer formed on the surface of a powdery metal-based soft magnetic material is used.
  • a method of forming the electric insulating layer for example, (1) placing a powdery metal soft magnetic material under reduced pressure or an inert gas atmosphere, supplying a trace amount of oxygen, and heating the material; A method of forming a metal oxide film on the surface thereof, and (2) adding a small amount of silane to a powdery metal-based soft magnetic material.
  • a layer of the silane capping agent is formed on the surface thereof, and then heated under reduced pressure to decompose the silane capping agent.
  • a method of forming a gay oxide film is exemplified.
  • silane coupling agents examples include vinyltrimethoxysilane, vinylinoletriethoxysilane, vinylinoletrichlorosilane, and the like. .
  • the silane coupling agent is usually used in the range of 0.1 to 5 parts by weight based on 100 parts by weight of the powdery metal-based soft magnetic material. After a metal oxide film is formed on the surface of a powdery metal-based soft magnetic material, a gay oxide film may be further formed thereon. It should be noted that it is difficult to obtain a sufficient withstand voltage by a method of performing a surface treatment with a simple silane coupling agent or a method of forming a dye layer on the surface.
  • the metal-based magnetic powder (B2) having an electric insulating layer formed on the surface preferably has an average particle diameter of 1 ⁇ m or more and 1 mm or less, and a range of 2 ⁇ m to 500 // m is preferable. More preferred. If the average particle size of the metal magnetic powder (B 2) is too small, the resulting soft magnetic resin composition tends to have low electric resistance. If the average particle diameter of the metal magnetic powder (B 2) is too large, the synthetic resin and the metal magnetic powder tend to separate.
  • the soft magnetic powder (B 1) and the metallic magnetic powder (B 2) are used in combination as the soft magnetic filler (B), a low elastic modulus reducing agent is used. It is preferable to add it. By adding a low-modulus agent, the withstand voltage of the obtained resin composition can be stably increased to a high level. If the electric insulating layer formed on the surface of the metallic magnetic powder (B 2) is broken when kneading the synthetic resin and each soft magnetic filler component, the resulting resin composition has a high resistance. Voltage drops. In addition, soft magnetic filters with high electrical resistance When the resin composition containing the filler is molded, a decrease in electric resistance, which is presumed to be due to residual stress in the molded body, is observed.
  • a low-modulus agent suppresses the destruction of the electrical insulating layer of the metallic magnetic powder (B2) and reduces the residual stress, so that the withstand voltage can be stably set at a high level. It is estimated that this can be done.
  • Silicone oil is preferred as a low-modulus agent.
  • silicone oils epoxy-modified silicone oil is particularly preferred in that it increases the withstand voltage of the resin composition.
  • the resin composition of the present invention is a resin composition containing a synthetic resin (A) and a soft magnetic filler (B), wherein the soft magnetic filler (B) is a Ni-Zn based resin.
  • the soft magnetic filler (B) is a Ni-Zn based resin.
  • At least one kind of soft ferrite powder selected from the group consisting of ferrite, Mg—Zn-based ferrite, and Cu-based ferrite; and It is a resin composition containing a soft finish powder (B1) having a porosity in the range of 0.01 to 5%.
  • the mixing ratio of the soft magnetic filler (B) is usually 100 to 2000 parts by weight, preferably 200 to 150 parts by weight, based on 100 parts by weight of the synthetic resin (A). Parts by weight, more preferably 250 to 100 parts by weight. Therefore, as the soft magnetic filler (B), the soft filler powder (B1) can be used within the above range.
  • the synthetic resin (A) The mixing ratio of the soft fly powder (B1) to 100 parts by weight is preferably in the range of 300 to 200 parts by weight, and 400 to 15 parts by weight. The content is more preferably in the range of 500 parts by weight, and particularly preferably in the range of 500 to 100 parts by weight. If the proportion of the soft fly powder (B 1) is too small, it is difficult to obtain a resin composition having a sufficient magnetic permeability, and if it is too large, the fluidity of the resin composition decreases. Molding becomes difficult.
  • a soft magnetic filler (B) in order to obtain a resin composition having a high magnetic permeability and a high level of withstand voltage (electrical resistance) and saturation magnetic flux density, a soft magnetic filler (B) is used.
  • the soft ferrite powder (B1) and the metal magnetic powder (B2) can be used in combination.
  • the soft magnetic filler (B) is composed of 10 to 90% by weight of the soft magnetic powder (Bl) and 90 to 10% by weight of the metallic magnetic powder (B2). It is preferable that they contain If the proportion of the soft powder (B 1) is too small, the withstand voltage may be insufficient. If the proportion is too large, the effect of improving the saturation magnetic flux density will be reduced.
  • the soft magnetic powder (B 1) and the metallic magnetic powder (B 2) are used in combination as the soft magnetic filler (B), the soft magnetic powder (B 1)
  • Ni—Zn type fine powder and / or Mg—Zn type fine powder are preferable.
  • the proportion of the soft briquette powder (B1) is more preferably from 20 to 80% by weight, and even more preferably from 25 to 75% by weight.
  • the proportion of the metal-based magnetic powder (B 2) is more preferably 80 to 20% by weight, and further preferably 75 to 25% by weight. By using both of them within these ranges, it is possible to obtain a resin composition having an appropriately high magnetic permeability and a high level of withstand voltage and saturation magnetic flux density. Can be done.
  • the soft magnetic filler is used with respect to 100 parts by weight of the synthetic resin (A).
  • Component (B 1 + B 2) is usually 100 to 2000 parts by weight, preferably 200 to 1500 parts by weight, more preferably 250 to 100 parts by weight. It is desirable to mix at a ratio of 0 parts by weight.
  • 0.1 to 1 part by weight of the total amount of the synthetic resin and the soft magnetic filler (B1 + B2) is 100 parts by weight. It is used in a proportion of 0 parts by weight, preferably 0.5 to 5 parts by weight. If the blending ratio of the low elastic modulus agent (C) is too small, the effect of stably maintaining the withstand voltage at a high level is not sufficient, and if it is too large, the mechanical properties and magnetic properties of the resin composition deteriorate. May occur.
  • the resin composition of the present invention contains various fillers such as a fibrous filler and a non-fibrous (plate, granular, powder, spherical) filler in order to improve mechanical properties, heat resistance, and the like. Can be contained.
  • the resin composition of the present invention may contain various additives such as a flame retardant, an antioxidant, and a coloring agent, if necessary.
  • the resin composition of the present invention can be produced by uniformly mixing the components. For example, a predetermined amount of each of a synthetic resin component, a soft magnetic filler component, and other optional components is mixed by a mixer such as a Henschel mixer and melt-kneaded to obtain a resin composition. Can be manufactured.
  • the resin composition of the present invention can be molded into a molded article having a desired shape by various molding methods such as injection molding, extrusion molding, and compression molding. The compact obtained in this way has excellent magnetic permeability and withstand voltage, and further has a high saturation magnetic flux density.
  • the withstand voltage of the resin composition of the present invention is usually 250 V or more, preferably 300 V or more, more preferably 350 V or more, and the porosity is 1 % Or less, the withstand voltage can be increased to 500 V or more. However, if the porosity is If a soft fly powder having substantially no voids is used when the content is less than 0.01%, decomposition of the synthetic resin occurs during melt-kneading or molding.
  • the upper limit of the withstand voltage is about 600 V, and in many cases, about 550 V.
  • the magnetic permeability of the resin composition of the present invention is usually 10 or more, preferably about 10 to 30 and most often about 10 to 20.
  • the resin composition of the present invention generally has a withstand voltage when the soft magnetic powder (B 1) and the metal magnetic powder (B 2) are used in combination as the soft magnetic filler (B). Above 3000 V, preferably above 350 V, often between 300 and 550 V, permeability is usually above 10 and preferably between 10 and 3 0, in most cases about 10 to 20 and the saturation magnetic flux density is usually more than 300 gauss, preferably about 300 to 600 gauss, more It is possible to obtain a resin composition of about 3,000 to 5,000 gauze.
  • the resin composition of the present invention can be applied to a wide range of uses such as coils, transformers, line filters, and electromagnetic wave shielding materials.
  • a disk-shaped electrode is brought into contact with both sides of a 0.8 mm-thick plate-like molded product, and cut at a measurement temperature of 23 ° C using a Kikusui Electronics pressure tester TOS 550.
  • the cutoff current was 1 mA, and the maximum AC voltage that could be applied for 60 seconds was determined.
  • the measurement was performed according to JISC-25661.
  • a 0.8 mm thick plate-like molded product was polished until the cross section of the soft fly powder was seen.
  • a scanning electron microscope JSM-630F manufactured by JEOL the cross section of the soft bright powder was observed.
  • a cross section of 10 soft fly powders was observed, and the porosity in the soft fly powders was calculated using an image processing apparatus JED-2100 manufactured by JEOL Ltd. based on the area.
  • the sintered body was pulverized with a hammer mill to obtain a powder having an average particle diameter of 47 m, and the specific gravity of the obtained powder was 4.6. 17.2 kg of the Mg-Zn-based fine powder obtained above, and polyphenylene sulfide (Kureha Chemical Co., Ltd .; 310 ° C, shear rate 100000)
  • the melt viscosity at Z second was about 20 Pa ⁇ s) 2.8 kg was weighed and mixed with a 20 L Hensyl mixer. Further, the obtained mixture was supplied to a twin-screw extruder set at 280 to 330 ° C. and melt-kneaded to obtain a pellet-like composition.
  • the obtained composition is supplied to an injection molding machine (manufactured by Nippon Steel Works: 1 W / 75 E), and the cylinder temperature is 280 to 310 ° C, and the injection pressure is about 1 OOO kgf / cm. 2.
  • a mold temperature of about 160 ° C. a plate-shaped molded product of 10 mm ⁇ l30 mm ⁇ 0.8 mm was obtained.
  • the withstand voltage of the obtained molded product was measured, it was more than 500 V. Further, the saturation magnetic flux density was 222 gauss.
  • the obtained plate-like molded product was polished, and the porosity in the magnetic powder was measured by a scanning electron microscope. As a result, the porosity in the magnetic material was 1%.
  • the obtained composition is supplied to an injection molding machine (PS-10E made by Nissei Resin), and the cylinder temperature is 280 to 310 ° C, the injection pressure is about 100 kgf / cm 2 , and the gold is At a mold temperature of about 160 ° C., a toroidal core was formed.
  • PS-10E made by Nissei Resin
  • Example 3 A raw material mixture having the same composition as in Example 1 was fired at a temperature of 125 ° C. for 3 hours and gradually cooled to room temperature over 8 hours to obtain a sintered body of Mg—Zn-based filler. .
  • a Mg—Zn-based ferrite powder was obtained from the obtained sintered body in the same manner as in Example 1. The average particle size of the obtained powder was 5 Om. Thereafter, the same operation as in Example 1 was performed. Table 1 shows the obtained results. [Example 3]
  • Example 1 shows the obtained results.
  • Example 1 A mixture having the same composition as in Example 1 was fired at a temperature of 1200 ° C. for 3 hours, and gradually cooled to room temperature over 8 hours to obtain a Mg—Zn-based sintered body. This sintered body was pulverized with a hammer mill to obtain a powder having an average particle diameter of 40 m. Thereafter, the same operation as in Example 1 was performed. Table 1 shows the results.
  • Example 3 A mixture having the same composition as in Example 3 was calcined at a temperature of 125 ° C. for 3 hours and gradually cooled to room temperature over 8 hours to obtain a Mg—Zn-based sintered body. .
  • This sintered body was pulverized with a hammer mill to obtain a powder having an average particle diameter of 45 ⁇ m. Thereafter, the same operation as in Example 1 was performed. Table 1 shows the results. table 1
  • Example 2 In the same manner as in Example 1, an Mg—Zn-based powder having an average particle diameter of 47 / m and a specific gravity of 4.6 was prepared.
  • a commercially available spherical carbonyl iron powder (manufactured by BASF, EN; average particle diameter: 4.3 m) was put into a vacuum dryer, and after depressurizing once, it was filled with argon gas. Next, after introducing a very small amount of air, the mixture was heated to 100 ° C. to form a metal oxide film on the surface of the carbonyl iron powder. To 100 parts by weight of the magnetic powder thus obtained, 2 parts by weight of a silane coupling agent (vinyl trimethoxysilane) was added []. Then, the mixture was stirred with a Hensyl mixer to form a layer of a silane coupling agent on the surface.
  • a silane coupling agent vinyl trimethoxysilane
  • the magnetic powder was transferred to a vacuum vessel and heated to 450 ° C. under reduced pressure to decompose the silane coupling agent, thereby forming a silicon oxide film on the surface.
  • carbonyl iron powder average particle diameter 4.3 / m having an electric insulating layer formed on the surface was obtained.
  • the pellet-like composition obtained in this manner is supplied to an injection molding machine (J-175E, manufactured by Nippon Steel Works, Ltd.), and the cylinder temperature is 280 to 310.
  • an injection pressure of about 1000 kgf / cm 2 , and a mold temperature of about 160 ° C a plate-shaped molded product of 10 mm x 13 0 mm x 0.8 mm was obtained.
  • the withstand voltage of the obtained molded product was measured, it was 400 V.
  • the porosity of the Mg—Zn ferrite powder was determined to be 1%.
  • the pellet-like composition obtained above was supplied to an injection molding machine (PS-10E manufactured by Nissei Plastics Co., Ltd.), and a cylinder temperature of 280 to 310 ° C and an injection pressure of about 1
  • a cylindrical sample (diameter 20 mm, height 7 mm) and a toroidal core were formed at a temperature of 0.000 kgf / cm 2 and a mold temperature of about 160 ° C.
  • the saturation magnetic flux density was measured using a cylindrical sample, it was found to be 540 Gauss.
  • the magnetic permeability was measured using the obtained toroidal core, it was 13.0. Table 2 shows the obtained results.
  • Example 4 Comparing the resin composition of Example 4 with the resin composition of Example 1, the withstand voltage decreased from 50,000 V to 400 V, but maintained a high level. In the case of the composition of Example 1, the composition was improved by more than double compared to the case of the composition of Example 2 which was 236 gauss. Also, in Example 4, instead of the luponyl iron powder having an electric insulating layer formed on its surface, spherical carbonyl iron powder (BASF, EN), which had not been subjected to surface insulation treatment, was used. It dropped to 0.000 V. Therefore, it is clear that the use of metal-based magnetic powder having an electric insulating layer formed on the surface makes it possible to obtain a resin composition in which the withstand voltage and the saturation magnetic flux density are balanced at a high level. is there. In Example 4, Epoki When the modified silicone oil was not added, the withstand voltage tended to decrease considerably. Therefore, the effect of holding the withstand voltage by the combined use of the low elastic modulus agent is apparent.
  • BASF, EN s
  • Example 4 8.5 kg of Mg-Zn-based fine powder was added to 5.
  • Example 4 The same operation as in Example 4 was performed, except that 0 kg and 8.5 kg of carbonyl iron powder having an electric insulating layer formed on the surface were changed to 12.0 kg, respectively.
  • the results are shown in Table 2.
  • Example 4 8.5 kg of Mg-Zn based powder was added to 12.
  • Example 4 The same operation as in Example 4 was performed, except that the powder was changed to 0 kg, and 8.5 kg of the luponyl iron powder having an electric insulating layer formed on the surface was changed to 5.0 kg.
  • Table 2 The results are shown in Table 2.
  • Example 4 17.0 kg of carbonyl iron powder having an electric insulating layer formed on the surface was used instead of using the Mg—Zn-based graphite powder as the magnetic substance powder. Other than the above, the same operation as in Example 4 was performed. The results are shown in Table 2.
  • N i 0 (6.7% by weight), Z n 0 (20.2% by weight), Cu 0 (.
  • a commercially available spherical carbonyl iron powder (manufactured by BASF, EN) was placed in a vacuum dryer, and the pressure was once reduced, and then argon gas was charged. Next, after introducing a very small amount of air, the mixture was heated to 100 ° C. to form a metal oxide film on the surface of the carbonyl iron powder.
  • a silane coupling agent vinyl trimethoxysilane
  • the mixture was stirred with a sir mixer to form a silane coupling agent layer on the surface.
  • the magnetic powder was transferred to a vacuum vessel, and heated to 450 ° C. under reduced pressure to decompose the silane coupling agent and form a gay oxide film on the surface.
  • carbonyl iron powder having an electric insulating layer formed on the surface was obtained.
  • Example 7 8.5 kg of the Ni—Zn-based powder was changed to 7.5 kg, 8.5 kg of the iron luponyl powder having an electric insulating layer formed on the surface was changed to 7.5 kg, and The same operation as in Example 7 was performed, except that the polyolefin sulfide was changed from 3.0 kg to 5.0 kg. Table 2 shows the obtained results.
  • a resin composition having a moderately high magnetic permeability and a remarkably improved withstand voltage is provided.
  • a soft magnetic resin composition having a high magnetic permeability and a high level of balance between electric resistance and saturation magnetic flux density is provided.
  • the resin composition of the present invention can be used, for example, in the field of molded articles requiring a high withstand voltage such as a coil, a transformer, and a line filter, or a high withstand voltage and a high saturation magnetic flux density. It can be applied to These molded articles can be used under conditions where their use has been restricted in the past.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

Cette composition de résine contient une résine synthétique et une charge magnétique douce et présente une perméabilité élevée et une tension de tenue. Ladite charge comprend au moins une poudre de ferrite doux choisi dans le groupe constitué par du ferrite Ni-Zn, du ferrite Mg-Zn et du ferrite Cu et elle possède un taux de vides compris entre 0,01 et 5 %.
PCT/JP1998/002296 1997-05-26 1998-05-26 Composition de resine WO1998054734A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP15285897A JPH10326707A (ja) 1997-05-26 1997-05-26 樹脂組成物
JP9/152858 1997-05-26
JP20219197A JP3838749B2 (ja) 1997-07-11 1997-07-11 軟磁性樹脂組成物
JP9/202191 1997-07-11

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WO1998054734A1 true WO1998054734A1 (fr) 1998-12-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1174687A2 (fr) * 2000-06-30 2002-01-23 Mitutoyo Corporation Capteur de position inductif

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0421739A (ja) * 1989-06-09 1992-01-24 Matsushita Electric Ind Co Ltd 複合材料及びその製造方法
JPH08236329A (ja) * 1994-12-16 1996-09-13 General Motors Corp <Gm> 潤滑性強磁性粒子

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0421739A (ja) * 1989-06-09 1992-01-24 Matsushita Electric Ind Co Ltd 複合材料及びその製造方法
JPH08236329A (ja) * 1994-12-16 1996-09-13 General Motors Corp <Gm> 潤滑性強磁性粒子

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1174687A2 (fr) * 2000-06-30 2002-01-23 Mitutoyo Corporation Capteur de position inductif
EP1174687A3 (fr) * 2000-06-30 2006-04-19 Mitutoyo Corporation Capteur de position inductif

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