WO2005094152A1 - 被覆フェライト成形品および被覆フェライト成形品の製造方法 - Google Patents
被覆フェライト成形品および被覆フェライト成形品の製造方法 Download PDFInfo
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- WO2005094152A1 WO2005094152A1 PCT/JP2004/004409 JP2004004409W WO2005094152A1 WO 2005094152 A1 WO2005094152 A1 WO 2005094152A1 JP 2004004409 W JP2004004409 W JP 2004004409W WO 2005094152 A1 WO2005094152 A1 WO 2005094152A1
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- ferrite molded
- molded article
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- ferrite
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0066—Constructional details of transient suppressor
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09D179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
Definitions
- the present invention relates to a coated ferrite molded product and a method for producing a coated ferrite molded product, and particularly to a coated ferrite molded product excellent in impact resistance and scattering prevention and a method for producing a coated ferrite molded product.
- noise suppression components such as ferrite bead varistors and choke coils have been installed. And responding to this.
- ferrite molded articles generally had problems such as low insulation resistance and poor strength, strength, and impact resistance.
- a plan view has a rectangular shape.
- a rectangular parallelepiped leg 353 is erected along both short edges of the plate 352, and a columnar leg 354 is erected in the center of the plate 3 52.
- a method has been proposed in which a polyimide film 355 is formed on the surface of 351 by a vapor deposition method.
- thermosetting resin or a thermoplastic resin an average particle size 5 to 2 Opm, formula MO 'F e 2 0 4 or MF e 2 0 4 (here, the IV1 Selected from at least one of Fe, Mn, Ni, Co, Mg, Zn, and Cd) in the range of 20 to 90 voI% and a viscosity of 30 to 3000 OmPa.
- IV1 Selected from at least one of Fe, Mn, Ni, Co, Mg, Zn, and Cd in the range of 20 to 90 voI% and a viscosity of 30 to 3000 OmPa.
- a material for electromagnetic wave shielding is disclosed.
- the ferrite molding n disclosed in Japanese Patent Application Laid-Open No. 10-12539 is a magnetic component such as a choke coil, it has not been able to efficiently exhibit an electromagnetic wave shielding effect.
- the polyimide film is formed around the ferrite by the vapor deposition method, it is necessary to prepare an extremely expensive and special vapor deposition device, and there is a problem that mass production is extremely difficult. .
- the ferrite disclosed in Japanese Patent Application Laid-Open No. 2001-284877 is a fine powder having an average particle size of 5 to 2 Opm. It is intended to be added, and as such, cannot effectively exhibit the electromagnetic wave shielding effect while fixing the electrical wiring inside the electrical product. It was.
- the ferrite described in Japanese Patent Application Laid-Open No. 10-125559 and Japanese Patent Application Laid-Open No. 2001-284947 is a method of forming an adhesive between a polyimide resin (polyimide film) and a polyimide resin.
- a ferrite molded article is provided with a coating material composed of a predetermined composition containing a polyimide resin and an epoxy compound on the surface thereof, thereby being used as ferrite beads or the like.
- the present inventors have found that fool liquor having good Katsuyu, and a coated ferrite molded article having excellent impact resistance and scattering prevention properties can be obtained, and have completed the present invention.
- the present invention has excellent impact resistance and anti-scattering property by synergistic effect of the polyimide resin and d, pheasant compound, while securing electrical wiring inside the electrical product. It is an object of the present invention to provide a coated ferrite molded product capable of exhibiting an electromagnetic wave shielding effect and a production method capable of efficiently obtaining such a coated ferrite molded product. Disclosure of the invention
- a c-light molded article provided on its surface with a coating material composed of a thermosetting composition or an ultraviolet curable composition containing a polyimide resin and an epoxy compound Is provided, and the above-mentioned problem can be solved.
- a coating composed of a predetermined composition containing a polyimide resin and an epoxy compound on the surface of the molded product not only is it easy to use, but also it has an impact resistance and A coated ferrite molded article having excellent scattering prevention properties can be obtained. Shi Therefore, the synergistic effect of the polyimide resin and the epoxy compound provides excellent impact resistance and shatterproof properties, as well as a coating that can exhibit electromagnetic wave shielding while securing electrical wiring inside electrical products. Ferrite molded articles can be provided.
- the amount of the epoxy compound added to 100 parts by weight of the polyimide resin in the thermosetting composition or the ultraviolet curable composition is preferably set to a value within the range of 880 parts by weight.
- the thermosetting composition or the ultraviolet-curable composition contains an amine compound or an acid anhydride and the amount of the amine compound or the acid anhydride added. It is preferable that the value be in the range of 1 to 30 parts by weight with respect to 100 parts by weight of the polyimide resin.
- a lubricant is further contained in the thermosetting composition or the ultraviolet-curable composition, and the amount of the lubricant added is controlled by the polyimide resin 100 It is preferred that the value be in the range of 0.1 to 20 parts by weight with respect to parts by weight. With this configuration, it is possible to provide a coated fiber molded article that can be appropriately plasticized, and has a good balance of impact resistance, scattering prevention properties, or adhesion b . Since the bendability is also improved, electric wiring and the like can be easily inserted when the ferrite molded product has a penetrating portion.
- a pigment is contained in the epoxy compound, and the amount of the pigment to be added is 10 to 120 parts by weight based on 100 parts by weight of the epoxy compound. It is preferable that the value be within the range of parts.
- the ferrite is in the form of a flat plate or a rectangular parallelepiped.
- the ferrite is in the shape of a rectangular parallelepiped, it is preferable to provide through holes having openings on at least two surfaces. .
- the coating material has a pencil hardness of 1 to 5 H measured in accordance with JISK540, and has a force at 25 ° C.
- the tensile elongation is preferably set to a value within a range of 50 to 150%. With this configuration, a good balance of impact resistance and anti-scattering property can be obtained.
- 3 ⁇ 4 A coated ferrite molded article can be provided.
- the thickness of the coating material is preferably set to a value within the range of 0.15 to 100 / m.
- the coating rate by the coating material be a value within the range of 10 to 90%, when the surface area of the ferrite is 100%.
- Another embodiment of the present invention is a method for producing a coated fiber molded article characterized by sequentially including the following steps (1) to (3).
- thermosetting composition or an ultraviolet-curable composition containing a polyimide resin and an epoxy compound A step of applying a thermosetting composition or an ultraviolet-curable composition containing a polyimide resin and an epoxy compound to the surface of the ferrite molded article while moving the ferrite molded article.
- thermosetting composition or an ultraviolet-curing composition has been applied.
- thermosetting composition or ultraviolet curable composition is applied, and then the ferrite molded article is heat-cured or ultraviolet-cured to obtain a relatively thin film. Even with a coating material having a uniform thickness, it can be formed with a uniform thickness. In addition, even when a relatively small through portion is provided, there is a possibility that the penetrating portion may be buried by the thermosetting composition or the ultraviolet curable composition by coating while moving the ferrite molded article. Can be reduced.
- the ferrite molded article is subjected to thermosetting with respect to its surface while rotating in a stirring vessel or on a conveying path in a plane rotation or a vertical rotation. It is preferred to apply the composition or the UV curable composition at least once.
- 1 (a) to 1 (c) are views provided for explaining the form of a coated ferrite molded article.
- FIG. 2 is a diagram provided to explain the effect of adding an epoxy compound.
- FIG. 3 is a diagram provided to explain a production flowchart of a coated ferrite molded product i)).
- FIGS. 4 (a) and 4 (b) are views provided to explain a tumbler coater.
- FIG. 5 is a diagram provided to explain the form of a conventional coated ferrite molded product.
- a coating material 14 composed of a thermosetting composition or an ultraviolet curable composition containing a polyimide resin and an epoxy compound is used.
- a coated ferrite molded product 10 provided on the surface of the ferrite molded product 12.
- the material of the ferrite constituting the ferrite molded article 1 2 illustrated in FIG. 1 (a) is not specifically restricted, for example, the general formula MO - F e 2 0 4 or MF e 2 0 4 (here , M is a metal selected from at least one of Fe, Mn, Ni, Co, Mg, Zn, and Cd).
- a ferrite molded product made of such a material is processed into a desired shape such as a plate or a rod as shown in Fig. 1 (b) by various methods such as rolling, forming, drawing or forming. Then, an adhesive layer 12c may be provided on the lower surface.
- FIG. 1 (a) it is a rectangular parallelepiped, and in the case of a rectangular parallelepiped, it is also preferable to include through-holes 12b having openings 12a on at least two surfaces.
- FIG. 1 (c) an excellent electromagnetic wave shielding effect can be obtained only by passing the electric wiring 15 inside the through hole 12b.
- the coating material 14 exemplified in FIG. 1 (a) is characterized by being composed of a thermosetting composition or an ultraviolet-curing composition containing a polyimide resin, an epoxy compound and:
- a thermosetting composition or an ultraviolet-curing composition containing a polyimide resin, an epoxy compound and:
- the coating material 14 it is not necessary to cover the entire surface of the ferrite molded product 12 with the coating material 14, and the coating may be partially performed as long as predetermined impact resistance and scattering prevention properties are obtained. Rather, as shown in FIG. 1 (a), when a through hole 12b having an opening 12a is provided, if the inner surface of the through hole 12b is covered, electrical wiring In some cases, it may be difficult to penetrate 15. Therefore, it is preferable that the covering ratio of the coating material 14 be a value within a range of 10 to 90 ⁇ 1 ⁇ 2 when the total surface area of the ferrite molded product 12 is 100%. No.
- the light molded product 12 is a flat plate, it is not necessary to consider the burial of the opening. Therefore, it is also preferable to set the coverage by the coating material 14 to 100 ⁇ 1 ⁇ 2. .
- preferred polyimide resins constituting the coating material 14 include ester acid dianhydrides, including polyamic acid as a precursor and polyamideimide resin as a derivative, and amine compounds (diamine compounds). Condensates of the formula More specifically, 2,2-bis (4-hydroxyphenyl) propanedibenzoate!
- amine compound examples include 3,3′-bis (aminophenoxyphenyl) sulfone, 4,4′diaminodiphenylsulfone, 1,3-bis (3-aminophenoxy) benzene, oxydianiline, and diaminodiphenyl. methane,
- a glycidyl ether type epoxy resin As a preferable epoxy resin, a glycidyl ether type epoxy resin, a glycidyl ester type epoxy resin, and a glycidylamine type epoxy resin can be used.
- the main raw materials of the epoxy resin include, for example, propylene glycol, tetrafuranilethane, hexahydrophthalic anhydride, bisphenol: L-Nol A, hydrogenated Bisphenol A, Bisphenol F, hydrogenated Bisphenol F, tetrabromo Bisphenol A, dimeric acid, diaminodiphenylmethane, isocyanuric acid, p-aminophenol and p-oxybenzoic acid can be used.
- thermosetting composition or a UV-curable composition containing a polyimide resin is mixed with a solution.
- Sulfoxide solvents such as dimethylsulfoxide and getylsulfoxide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylacetamide, N, N- It is preferable to add an organic solvent such as tilacetoamide, N-methyl-1-pyrrolidone, phenol, cresol, xinol, phenol halide, catechol, hexamethylphosphoramide, T-butyrolactone, and tetrahydrofuran. .
- the addition amount of the epoxy compound is set to a value within a range of 5 to 80 parts by weight based on 100 parts by weight of the polyimide resin. Is preferred.
- the reason for this is that when the amount of the epoxy compound added is less than 1 part by weight, the hardness of the coating material decreases, the adhesion strength of the coating material to the ferrite molded product decreases, or the heat resistance of the coating material decreases. This is because the property may decrease.
- the amount of the epoxy compound to be added is more preferably in the range of 5 to 50 parts by weight, and more preferably in the range of 10 to 30 parts by weight, per 100 parts by weight of the polyimide resin. Is more preferable.
- the horizontal axis of FIG. 2 shows the amount (parts by weight) of the epoxy compound added to 100 parts by weight of the polyimide resin, and the left vertical axis shows the pencil hardness (H). hand Yes, the vertical axis shows the impact resistance (relative value).
- the amount of the epoxy compound to be added should be set to a value within the range of 1 to 80 parts by weight per 100 parts by weight of the polyimide resin. It is more preferable to use a value within the range of 5 to 50 parts by weight.
- thermosetting composition or the ultraviolet curable composition further contains an amine compound or an acid anhydride as a polyimide resin raw material, and the amount of the amine compound or the like is added to 100 parts by weight of the polyimide resin.
- a value within the range of 1 to 30 parts by weight is preferable. The reason is that if the amount of the amine compound or the like is less than 1 part by weight, the effect of the addition may not be exhibited.
- the addition amount of the amine compound or the like exceeds 30 parts by weight, it becomes difficult to form a film with a uniform thickness, and the wet resistance may decrease.
- the amount of the amine compound or the acid anhydride is more preferably set to a value within the range of 2 to 20 parts by weight per 100 parts by weight of the polyimide resin, and more preferably within the range of 3 to 15 parts by weight. More preferably, it is set to a value.
- a lubricant is further contained in the thermosetting composition or the ultraviolet-curable composition, and the amount of the lubricant is 0.1 to 30 parts by weight based on 100 parts by weight of the polyimide resin. The value is preferably within the range of parts by weight.
- the amount of the lubricant to be added is preferably in the range of 2 to 25 parts by weight per 100 parts by weight of the polyimide resin, more preferably in the range of 3 to 20 parts by weight. More preferably,
- fluorinated resin vinylidene fluoride resin, urethane fluoride resin, fluorinated amino resin
- polytrifluoroethylene resin polytetrafluoroethylene resin, polyhexafluoropropylene resin, Fluorinated polyethylene propylene copolymer resin, polychlorinated trifluoroethylene resin, ethylene-tetrafluoroethylene copolymer resin, tetrafluoroethylene-hexafluoropropylene copolymer resin, tetrafluoroethylene copolymer Fluororesin such as perfluoroalkylvinylether copolymer resin.
- the lubricant it is also preferable to contain, for example, graphite, molybdenum disulfide, boron nitride, liquid paraffin, silicone oil, fluorine oil, mechanical oil, castor oil, oleic acid, etc., in addition to the above-mentioned fluororesin. .
- thermosetting composition or the ultraviolet curable composition further contains other additives.
- a diluting solvent such as alcohols, ketones, and glycols as an additive.
- Inorganic fillers such as alumina, kaolin, talc, calcium carbonate, calcium silicate, magnesium hydroxide, etc .
- organic fillers such as acrylic resin powder, epoxy resin powder, polyester resin powder; Rikibon black, red bengala, phthalocyanine blue, cream yellow And pigments such as titanium dioxide; coloring agents typified by dyes; metal powders; lubricants; mold release agents; surfactants: it is preferable to add one kind or a combination of two or more kinds of coupling agents.
- additives such as titanium oxide, titanium red, cadmium yellow, cobalt oxide, iron oxide, ferrite, metal-free phthalocyanine pigment, aluminum phthalocyanine pigment
- a coloring agent such as a titanium phthalocyanine pigment, an iron phthalocyanine pigment, a phthalocyanine pigment, a nickel phthalocyanine pigment, a tin phthalocyanine pigment, and a copper phthalocyanine pigment.
- thermosetting resin examples include, for example, a phenol resin, a maleimide resin, a urea resin, a vinyl ester resin, a silicone compound, an unsaturated polyester resin, and the like, alone or in combination of two or more.
- the thickness of the coating material is preferably set to a value within a range of 0.1 to 150 ⁇ m.
- the thickness of such a coating material is less than 0.1 / m, impact resistance and scattering prevention may decrease.
- the thickness of the coating material exceeds 150 m, it may be difficult to form a film with a uniform thickness, and even if a through hole for passing electric wiring or the like is provided. This is because the through-hole may be buried.
- the thickness of the coating material is more preferably set to a value in the range of 1 to 12 O / im, and further preferably to a value in the range of 10 to 100 jUm.
- the pencil hardness measured according to JISK 540 be a value within a range of 1 to 5H.
- the reason for this is that if the pencil hardness of such a coating material is less than 1 H, the mechanical strength is reduced, and as a result, the impact resistance and the scattering prevention property may also be reduced. On the other hand, if the pencil hardness of such a coating material exceeds 5 H, the adhesion to a ferrite molded product may be reduced, or the selectivity of usable materials may be significantly narrowed.
- the pencil hardness of such a coating material it is more preferable to set the pencil hardness of such a coating material to a value in the range of 2 to 4H.
- the tensile elongation of the coating material at 25 ° C. is preferably set to a value within a range of 50 to 150%.
- the tensile elongation of the coating material is less than 5 5 ⁇ / ⁇ , the mechanical strength is reduced, and the impact resistance and the anti-scattering property may be reduced accordingly.
- the tensile strength of the coating material exceeds 150%, the selectivity of usable materials may be significantly narrowed. Therefore, the tensile elongation of the coating material is more preferably set to a value within a range of 70 to 120%, and further preferably set to a value within a range of 80 to 100%.
- the tensile strength is measured in accordance with JIS K5400 of dressing a value within the range of 1 ⁇ 100 kg fZmm 2.
- the tensile strength of such a coating material is more preferably set to a value within the range of 5 to 80 kgf Zmm 2 , and even more preferably set to a value within the range of 10 to 50 kgf Zmm 2 .
- the tensile modulus of the coating material measured according to JIS K5400 be a value within the range of 100 to 5 OO kgf Zmm 2 .
- the selectivity of usable materials may be significantly narrowed.
- the tensile modulus of the coating material is more preferably set to a value in the range of 120 to 300 kgf Zmm 2 , and more preferably to a value in the range of 150 to 250 kgf Zmm 2 .
- the volume resistivity of the 1 X 1 0, 3 ⁇ ⁇ cm or more.
- the reason for this is that if the volume resistivity of the coating material is less than 1 ⁇ 10 13 ⁇ ⁇ cm, the electrical properties will deteriorate, and the impact resistance and shatterproof properties after a long period of time will decrease. This is because there is also a case where it decreases.
- the volume resistivity of the coating material is preferably set to a value within the range of 1 ⁇ 10 14 to 1 ⁇ 10 18 ⁇ ⁇ cm, and more preferably 5 ⁇ 10 14 to 1 ⁇ 10 17 ⁇ . , And more preferably within a range of cm.
- the dielectric breakdown pressure of the coating material is set to a value of 50 kV Zmm or more. The reason for this is that if the dielectric breakdown pressure of such a coating material is less than 50 kVZmm, the electrical properties will decrease, and the impact resistance and shatterproof after a long time may also decrease. That's why.
- the dielectric breakdown pressure of the coating material it is more preferable to set the dielectric breakdown pressure of the coating material to a value within the range of 80 to 200 kVZmm, and more preferably to a value within the range of 100 to 180 kVZmm. Is even more preferred.
- the second embodiment of the present invention is a method for producing a coated ferrite molded product including the following steps (1) to (3) as shown in the production flowchart (S1 to S5) in FIG.
- thermosetting composition or an ultraviolet-curing composition containing a polyimide resin and an epoxy compound A step of applying a thermosetting composition or an ultraviolet-curing composition containing a polyimide resin and an epoxy compound to the surface of the ferrite molded article while moving the ferrite molded article (S3)
- thermosetting composition or the ultraviolet curable composition is applied to form a coated ferrite molded article
- the surface of the ferrite molded product molded in S1 in FIG. 3 be previously cleaned as shown in S2.
- the surface of the ferrite molded product is activated by degreasing oils and fats using an organic solvent such as trichloroethylene and trichloroethane, or an aqueous cleaning agent such as an alkaline cleaning agent. It is preferable to keep it.
- thermosetting composition or an ultraviolet curable composition it is preferable to apply a thermosetting composition or an ultraviolet curable composition to the surface of the ferrite molded article.
- thermosetting composition or an ultraviolet curable composition it is preferable to apply a thermosetting composition or an ultraviolet curable composition to the surface of a ferrite molded product using a tumbler coater as shown in FIG. 3. Step of curing the thermosetting composition or the ultraviolet curable composition
- the ferrite molded article to which the thermosetting composition or the ultraviolet curable composition was applied was heat-cured or ultraviolet-cured, Preferably, a coating is formed.
- an inner space 120 configured to accommodate a ferrite molded product, a rotating member 113 with an openable door 103, and It is preferred to use a tumbler coater 100 with a. Therefore, a plurality of stirring baffles 107 a and 107 b and a transport baffle 105 are provided in the internal space 120, and the rotating member 113 is connected to the communication sound 151 109. It is possible to rotate in a predetermined direction of rotation by a rotating device 1 11 below. Further, by opening the door 103, the thermosetting composition or the ultraviolet curable composition to be used as the ferrite molded product or the coating material is turned into the rotating member 113 by using the charging device 101. Can be accommodated.
- a tumbler having an internal space 220 configured to accommodate a ferrite molded product, and a rotating member 211 with an openable door 203.
- One coater 200 is provided with a plurality of stirring baffles 200 a and 207 b in its internal space 220 and a transport baffle 205, and a rotating member 211 is provided. It may be configured to be rotated by a rotating device 211 on a side surface of the communication portion 209.
- the charging device 201 is used to apply a ferrite molded product or a thermosetting composition or a UV-curable composition to be a coating material to the rotating member 211.
- a ferrite molded product or a thermosetting composition or a UV-curable composition to be a coating material to the rotating member 211.
- the coating material 14 is ferrite mainly using centrifugal force and gravity. G can be applied to the surface of molded products.
- a tumbler coater 100 or 200 as shown in FIGS. 4 (a) and 4 (b) When a tumbler coater 100 or 200 as shown in FIGS. 4 (a) and 4 (b) is used, it is heated for 10 minutes to 10 hours at a temperature of 50 to 300 ° C. It is preferable that the curable composition is thermally cured to form a coating material having a predetermined thickness.
- the ultraviolet curable composition it is preferable to cure the ultraviolet curable composition by, for example, setting the exposure amount to a value within a range of 50 to 1,000 OmJ / cm 2 . Further, in the case of ultraviolet curing, exposure to light in a vacuum state or in an inert gas is also preferable because the active state of the photopolymerization initiator can be maintained for a long time.
- an inspection process (including an evaluation process) is set up as shown in S5.
- an inspection process including an evaluation process
- the coating ferrite that does not conform to the specified characteristics and dimensional standards is used. It is preferable to exclude the molded products.
- a flat iron plate (length 20 cm, width 20 cm, thickness 1 mm) was prepared as a ferrite molded product, and the surface was degreased using trichlorethylene and an alkaline cleaning agent.
- 100 parts by weight of the polyimide resin, 20 parts by weight of the epoxy compound, and 5 parts by weight of the amine compound are stirred while the ferrite molded article is vertically stirred.
- 15 and 700 parts by weight of organic solvent (THF) The coating composition was heated at 250 ° C for 120 minutes while spraying and spraying the curable composition in 20 batches to form a coating material with a thickness of 7 O / im as shown in Fig. 1 (c).
- a coated ferrite molded product was prepared.
- thermosetting composition was separately heated and cured under the same conditions to form a film, and the tensile strength, tensile elongation and tensile modulus were measured in accordance with JIS K5400.
- the obtained coated ferrite molded product (the number of samples: 10) was naturally dropped from a height of 1.8 m, and the impact resistance was evaluated according to the following criteria.
- the obtained coated ferrite molded product (the number of samples: 10) was subjected to a grid test (1 mm cross hatch) in accordance with JIS K5400, and the adhesion was evaluated according to the following criteria.
- ⁇ The number of peelings is 0100 cross-cut.
- the number of peeling is 1 ⁇ 3Z10 O grid.
- Peeling number is 4 to 10Z1 O0 grid.
- x The number of peeling is more than 10
- the pencil hardness was measured in accordance with JIS K5400 and calculated as an average value.
- the obtained coated ferrite molded article (the number of samples: 10) was placed in an oven maintained at a temperature of 250 ° C, and changes in appearance (peeling, cracking, discoloration, etc.) were observed at predetermined intervals.
- the heat resistance was evaluated according to the following criteria.
- the obtained coated fiber molded product (10 samples) was placed in a temperature / humidity oven maintained at a temperature of 49 ° C and a humidity of 98%, and the appearance changed (peeling, cracking) at predetermined time intervals. , Discoloration, etc.) were observed, and the moisture resistance was evaluated according to the above criteria.
- a salt spray test (SST test, temperature: 35 ° C, concentration 5%) based on JIS Z2371 was performed on the obtained coated ferrite molded product (the number of samples: 10), and the appearance changed every predetermined time ( (Spills, cracks, discoloration, etc.) were observed, and the salt water resistance was evaluated according to the following criteria.
- the obtained coated ferrite molded product (sample number: 10) was immersed in sulfuric acid (20 ⁇ volume), methyl ethyl ketone (MEK), and sodium chloride (saturated aqueous solution) for a predetermined time, respectively. Changes in appearance (peeling, cracking, discoloration, etc.) were observed, and the chemical resistance was evaluated according to the following criteria.
- the volume resistivity ( ⁇ ⁇ cm) and the dielectric breakdown pressure (kV mm) of the obtained coated X-lite molded product were measured and calculated as average values.
- Example 2 the effect of the added amount of the epoxy compound was examined. That is, in Example 2, the addition amount of the epoxy compound was set to 5 parts by weight with respect to 100 parts by weight of the polyimide resin, and in Example 3, the addition amount of the epoxy compound was set to 10 parts by weight. In Example 4, the amount of the epoxy compound was similarly set to 30 parts by weight, and in Example 5, the amount of the epoxy compound was similarly set to 50 parts by weight.
- a coated ferrite molded product (sample number: 10) was prepared for each evaluation.
- Example 6 the effect of the amount of the amine compound added was examined. That is, in Example 6, the amount of the amine compound was set to 1 part by weight with respect to 100 parts by weight of the polyimide resin. In Example 7, the amount of the amine compound was similarly set to 100 parts by weight. In Example 8, a coated ferrite molded article (sample number: 10) was prepared in the same manner as in Example 1 except that the amount of the amine compound added was 20 parts by weight. Each evaluation was performed.
- Example 9 the influence of the thickness of the coating material was examined. That is, in Example 9, the thickness of the coating material was set to 20 ⁇ m, in Example 10, the thickness of the coating material was set to 30 ⁇ m, and in Example 11, the thickness of the coating material was set to Except that the length was set to 50 ⁇ m, coated ferrite molded articles (samples: 10) were prepared and subjected to each evaluation iffi in the same manner as in the implementation ⁇ 1.
- Example 1 coated ferrite molded articles (sample number: 10) were prepared and evaluated in the same manner as in Example 1 except that no epoxy compound was added.
- a coating material composed of a predetermined composition containing a polyimide resin and an epoxy compound on the surface of the ferrite molded article By providing a ferrite bead, it is now possible to efficiently obtain a fool liquor which is easy to use as a ferrite bead, and a coated ferrite molded product having excellent impact resistance and scattering prevention properties.
- the coated ferrite molded article of the present invention is used for various electric appliances, and can exhibit an excellent electromagnetic wave shielding effect over a long period of time.
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- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Laminated Bodies (AREA)
- Soft Magnetic Materials (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006516823A JP3865765B2 (ja) | 2004-03-29 | 2004-03-29 | 被覆フェライト成形品および被覆フェライト成形品の製造方法 |
CNA2004800423956A CN1926934A (zh) | 2004-03-29 | 2004-03-29 | 覆膜铁氧体成形品及覆膜铁氧体成形品的制造方法 |
PCT/JP2004/004409 WO2005094152A1 (ja) | 2004-03-29 | 2004-03-29 | 被覆フェライト成形品および被覆フェライト成形品の製造方法 |
TW093133703A TWI263477B (en) | 2004-03-29 | 2004-11-04 | Coated ferrite article and its producing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/004409 WO2005094152A1 (ja) | 2004-03-29 | 2004-03-29 | 被覆フェライト成形品および被覆フェライト成形品の製造方法 |
Publications (1)
Publication Number | Publication Date |
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WO2005094152A1 true WO2005094152A1 (ja) | 2005-10-06 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/004409 WO2005094152A1 (ja) | 2004-03-29 | 2004-03-29 | 被覆フェライト成形品および被覆フェライト成形品の製造方法 |
Country Status (4)
Country | Link |
---|---|
JP (1) | JP3865765B2 (ja) |
CN (1) | CN1926934A (ja) |
TW (1) | TWI263477B (ja) |
WO (1) | WO2005094152A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009287737A (ja) * | 2008-05-30 | 2009-12-10 | Jtekt Corp | 転がり軸受の製造方法 |
US8198609B2 (en) | 2007-08-09 | 2012-06-12 | Samsung Led Co., Ltd | Apparatus for forming nano pattern and method for forming the nano pattern using the same |
JP2013120910A (ja) * | 2011-12-08 | 2013-06-17 | Seiwa Electric Mfg Co Ltd | フェライトコア |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4611432B1 (ja) * | 2009-07-06 | 2011-01-12 | 株式会社仲田コーティング | タンブラーコーティング装置及びタンブラーコーティング方法 |
KR20140076778A (ko) * | 2012-12-13 | 2014-06-23 | 엘지이노텍 주식회사 | 엘라스토머 조성물 및 그 조성물로 코팅된 페라이트 자성체 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61171563A (ja) * | 1985-01-23 | 1986-08-02 | Tokyo Copal Kagaku Kk | 表面改質剤の塗布装置 |
JPH0476120U (ja) * | 1990-11-16 | 1992-07-02 | ||
JPH0661062A (ja) * | 1992-08-06 | 1994-03-04 | Fujitsu Ltd | ノイズ除去素子 |
JPH0774026A (ja) * | 1993-08-31 | 1995-03-17 | Tokin Corp | 雑音防止部品 |
JP2001313215A (ja) * | 2000-04-28 | 2001-11-09 | Densei Lambda Kk | 電子部品用ビーズコア |
JP2002204094A (ja) * | 2000-12-28 | 2002-07-19 | Fdk Corp | 電磁波抑制体 |
JP2002270415A (ja) * | 2001-03-12 | 2002-09-20 | Tdk Corp | R−Fe−B系永久磁石 |
-
2004
- 2004-03-29 JP JP2006516823A patent/JP3865765B2/ja not_active Expired - Fee Related
- 2004-03-29 WO PCT/JP2004/004409 patent/WO2005094152A1/ja active Application Filing
- 2004-03-29 CN CNA2004800423956A patent/CN1926934A/zh active Pending
- 2004-11-04 TW TW093133703A patent/TWI263477B/zh not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61171563A (ja) * | 1985-01-23 | 1986-08-02 | Tokyo Copal Kagaku Kk | 表面改質剤の塗布装置 |
JPH0476120U (ja) * | 1990-11-16 | 1992-07-02 | ||
JPH0661062A (ja) * | 1992-08-06 | 1994-03-04 | Fujitsu Ltd | ノイズ除去素子 |
JPH0774026A (ja) * | 1993-08-31 | 1995-03-17 | Tokin Corp | 雑音防止部品 |
JP2001313215A (ja) * | 2000-04-28 | 2001-11-09 | Densei Lambda Kk | 電子部品用ビーズコア |
JP2002204094A (ja) * | 2000-12-28 | 2002-07-19 | Fdk Corp | 電磁波抑制体 |
JP2002270415A (ja) * | 2001-03-12 | 2002-09-20 | Tdk Corp | R−Fe−B系永久磁石 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8198609B2 (en) | 2007-08-09 | 2012-06-12 | Samsung Led Co., Ltd | Apparatus for forming nano pattern and method for forming the nano pattern using the same |
JP2009287737A (ja) * | 2008-05-30 | 2009-12-10 | Jtekt Corp | 転がり軸受の製造方法 |
JP2013120910A (ja) * | 2011-12-08 | 2013-06-17 | Seiwa Electric Mfg Co Ltd | フェライトコア |
Also Published As
Publication number | Publication date |
---|---|
TW200533279A (en) | 2005-10-01 |
CN1926934A (zh) | 2007-03-07 |
TWI263477B (en) | 2006-10-01 |
JP3865765B2 (ja) | 2007-01-10 |
JPWO2005094152A1 (ja) | 2007-08-16 |
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