Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
  • C08K3/20—Oxides; Hydroxides
  • C08K3/22—Oxides; Hydroxides of metals
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L101/00—Compositions of unspecified macromolecular compounds
• • 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
• • 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

Definitions

• the present invention relates to a ferrite powder, a resin composition, and a molded body.
• metal detectors cannot detect general plastic materials or the like, they cannot be detected even if foreign materials derived from tools such as packaging materials used at the time of manufacture are mixed.
• Patent Document 1 For the purpose of solving such a problem, a work glove including a metal detector composed of a metal such as iron has been proposed (see Patent Document 1).
• An object of the present invention is to provide a molded body that can be stably detected by a metal detector, and to provide a ferrite powder and a resin composition that can be suitably used for manufacturing the molded body. is there.
• the ferrite powder of the present invention is a ferrite powder detectable by a metal detector, including hard ferrite particles,
• the amount of Na measured by ion chromatography is 1 ppm or more and 200 ppm or less.
• the ferrite powder of the present invention preferably contains hard ferrite particles containing Sr in a range of 7.8 to 9.0% by mass and Fe in a range of 61.0 to 65.0% by mass.
• the volume average particle diameter of the constituent particles of the ferrite powder is 0.1 ⁇ m or more and 100 ⁇ m or less.
• the residual magnetization by VSM measurement when a magnetic field of 10 K ⁇ 1000 / 4 ⁇ A / m is applied is 25 A ⁇ m 2 / kg or more and 40 A ⁇ m 2 / kg or less.
• the coercive force by VSM measurement when a magnetic field of 10K ⁇ 1000 / 4 ⁇ A / m is applied is preferably 39.7 kA / m or more and 320 kA / m or less.
• the amount of Cl measured by ion chromatography is preferably 1 ppm or more and 100 ppm or less.
• the S amount measured by ion chromatography is preferably 1 ppm or more and 1000 ppm or less.
• the resin composition of the present invention comprises the ferrite powder of the present invention, And a resin material.
• the ferrite powder is dispersed in the resin material.
• the ferrite powder content in the resin composition is preferably 5.0% by mass or more and 90% by mass or less.
• the resin material is polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol (PVA), fluororesin, silicone rubber, butadiene rubber, thermoplastic elastomer, epoxy resin, and silicone resin. It is preferable to include one or more selected from the group consisting of:
• the molded article of the present invention is characterized by having a portion formed using the resin composition of the present invention.
• the ferrite powder content is preferably 2.0% by mass or more and 20% by mass or less.
• the molded product of the present invention is preferably used in food production, processing and packaging sites.
• the molded body of the present invention is preferably used for some or all of cooking utensils, cooking utensils, and food packaging members.
• the molded body of the present invention preferably contains the ferrite powder in a region within 1.0 mm in the thickness direction from the surface.
• a molded body that can be stably detected by a metal detector, and to provide a ferrite powder and a resin composition that can be suitably used for manufacturing the molded body. it can.
• the ferrite powder of the present invention includes a plurality of hard ferrite particles.
• the ferrite powder and the molded body containing the ferrite powder can be easily detected by the metal detector. Therefore, for example, when the ferrite powder of the present invention or at least a part of a molded body containing the ferrite powder is mistakenly mixed in a product such as food, etc., it can be suitably detected by a metal detector, It is possible to effectively prevent the product from being distributed to the outside.
• the ferrite powder as described above has an oxide as a main component, is chemically stable, and has excellent corrosion resistance and chemical resistance. Therefore, the detection stability by the metal detector is excellent.
• the metal detector composed of a metal material
• the above ferrite powder is excellent also in the safety
• the hard ferrite powder of the present invention has an Na (sodium) amount measured by ion chromatography of 1 ppm or more and 200 ppm or less.
• the amount of Na is a value within the above range, even a molded body to which metal powder is added in addition to ferrite powder can be used in a stable state over a long period of time.
• the amount of Na is small, Na components derived from impurities contained in the raw materials (particularly impurities contained in Sr raw materials and impurities derived from salt contained in industrial water) cannot be completely removed. .
• the amount of Na exceeds the above upper limit, when ferrite powder is used as a filler, it may cause an increase in viscosity at the time of mixing with a resin material, or the molded body requires insulation in a large amount of moisture The resistance of the SUS ball is lowered more than necessary, and the SUS ball sensitivity is increased more than necessary.
• the amount of Na (sodium) measured by ion chromatography may be 1 ppm to 200 ppm, preferably 1 ppm to 150 ppm, preferably 1 ppm to 110 ppm.
• the following is more preferable. Thereby, the effects as described above are more remarkably exhibited.
• the measurement of the amount of Na in hard ferrite powder can be performed as follows, for example. First, 10 ml of ultrapure water (for example, Direct-Q UV3 manufactured by Merck & Co., Inc.) is added to 1 g of ferrite powder, and ultrasonic components are irradiated for 30 minutes to extract ion components. Next, the supernatant of the obtained extract is filtered through a pre-treatment disposable disk filter (for example, W-25-5 manufactured by Tosoh Corporation, pore diameter 0.45 ⁇ m, etc.) to prepare a measurement sample. Next, the amount of Na (amount of sodium ions) can be determined by performing quantitative analysis of the cation component contained in the measurement sample by ion chromatography. The conditions for ion chromatography can be, for example, as follows.
• IC-2010 manufactured by Tosoh Corporation -Column: TSKgel SuperIC-Cation HSII (4.6 mm ID ⁇ 1 cm + 4.6 mm ID ⁇ 10 cm) -Eluent: Methanesulfonic acid (3.0 mmol / L) + 18-crown 6-ether (2.7 mmol / L) -Flow rate: 1.0 mL / min -Column temperature: 40 ° C -Injection volume: 30 ⁇ L -Measurement mode: Non-suppressor system-Detector: CM detector-Standard sample: Cation mixed standard solution manufactured by Kanto Chemical Co., Inc.
• the ferrite powder of the present invention may contain particles composed of, for example, Ba-based ferrite, but Sr is 7.8% by mass to 9.0% by mass, and Fe is 61.0% by mass. It is preferably 65.0% by mass or less and containing a plurality of hard ferrite particles. Thereby, the effects as described above are more remarkably exhibited.
• the Sr content in the hard ferrite particles is less than 7.8% by mass, the amount of Fe becomes excessive, and the particles contain a relatively large amount of Fe 2 O 3 , and the magnetization is reduced. It may become difficult to detect the ferrite powder and a molded body containing the ferrite powder by a metal detector.
• the Sr content in the hard ferrite particles exceeds 9.0% by mass, the amount of Sr becomes excessive and the particles contain a relatively large amount of SrO, or Sr— other than Sr ferrite. Fe oxide will be contained, magnetization will fall, and it may become difficult to detect the ferrite powder and the molded body containing the ferrite powder by a metal detector.
• the Fe content in the hard ferrite particles is less than 61.0% by mass, the amount of Sr becomes excessive and the particles contain a relatively large amount of SrO, or Sr other than Sr ferrite. -Fe oxide will be contained, the magnetization will decrease, and it may be difficult to detect the ferrite powder and the molded body containing the ferrite powder by a metal detector.
• the Fe content in the hard ferrite particles exceeds 65.0 mass%, the amount of Fe becomes excessive, and a relatively large amount of Fe 2 O 3 is contained in the particles, so that the magnetization decreases, It may be difficult to detect the ferrite powder or a molded body containing the ferrite powder with a metal detector.
• the Sr content in the hard ferrite particles is preferably 7.8 mass% or more and 9.0 mass% or less, but is 7.9 mass% or more and 8.9 mass% or less. Is more preferable, and it is further more preferable that it is 8.0 to 8.8 mass%. Thereby, the effects as described above are more remarkably exhibited.
• the content of Fe in the hard ferrite particles is preferably 61.0% by mass or more and 65.0% by mass or less, more preferably 61.1% by mass or more and 64.9% by mass or less. 61.2% by mass or more and 64.8% by mass or less is more preferable. Thereby, the effects as described above are more remarkably exhibited.
• the content of metal elements (Fe, Sr, etc.) constituting the ferrite particles can be measured as follows.
• ferrite particles are weighed, and a mixture obtained by mixing the ferrite particles in a mixed solvent of pure water: 60 ml, 1N hydrochloric acid: 20 ml and 1N nitric acid: 20 ml is obtained. Thereafter, the mixture is heated to obtain a solution in which the ferrite particles are completely dissolved. Thereafter, the content of the metal element can be determined by measuring the solution using an ICP analyzer (for example, ICPS-1000IV, manufactured by Shimadzu Corporation).
• ICP analyzer for example, ICPS-1000IV, manufactured by Shimadzu Corporation.
• the hard ferrite constituting the hard ferrite particles as described above may contain components (elements) other than Fe, Sr, and O.
• components include Ti, Si, Cl, Ca, Al, and the like.
• the content of components (elements) other than Fe, Sr, and O contained in the hard ferrite constituting the hard ferrite particles as described above is preferably 1.0% by mass or less.
• the hard ferrite particles may contain components other than hard ferrite.
• the content of components other than hard ferrite contained in the hard ferrite particles is preferably 1.0% by mass or less.
• the volume average particle diameter of the constituent particles of the ferrite powder is not particularly limited, but is preferably 0.1 ⁇ m or more and 100 ⁇ m or less, and more preferably 0.2 ⁇ m or more and 80 ⁇ m or less.
• the dispersibility of the ferrite powder in the resin material can be further improved, and a resin composition containing the ferrite powder and the resin material can be more suitably manufactured.
• strength of the molded object manufactured using the said resin composition, surface property, and reliability can be improved more.
• the manufacture of the molded object using a resin composition can be performed more stably.
• the color tone of the molded product can be adjusted more suitably.
• the resin material may be used during the production of the resin composition described later. It is not preferable because it takes time to disperse the ferrite powder or the agglomerate is dispersed. Further, the smaller the particle size, the stronger the coloring power of ferrite, and it is not preferable because it tends to become dull when a color other than black, gray or brown is applied.
• the volume average particle diameter of the constituent particles of the ferrite powder exceeds the upper limit, depending on the amount of ferrite powder used for the production of the resin composition, the shape and size of the molded body produced using the resin composition Depending on the above, the strength and surface properties (finish) of the molded body when it is formed may be reduced, which is not preferable. Further, for example, when an injection molding method is employed as a method for producing a molded body, the resin composition may block the injection path, which is not preferable.
• the volume average particle diameter of the constituent particles of the ferrite powder is selected, for example, depending on the shape and size of the molded body produced using the ferrite powder, and more specifically, the production of the film / sheet shaped molded body.
• the volume average particle size of the constituent particles of the ferrite powder is preferably 10 ⁇ m or less.
• the volume average particle diameter of the ferrite powder is preferably 5 ⁇ m or more. Thereby, the influence of the color of ferrite powder at the time of coloring can be minimized.
• the volume average particle diameter can be determined, for example, by the following measurement. That is, first, 10 g of ferrite powder as a sample and 80 ml of water are placed in a 100 ml beaker, and 2 to 3 drops of a dispersant (sodium hexametaphosphate) are added. Next, dispersion is performed using an ultrasonic homogenizer (for example, UH-150 model manufactured by SMT Co. LTD.). As an ultrasonic homogenizer, SMT. Co. LTD. When using the UH-150 model, for example, the output level may be set to 4 and dispersion may be performed for 20 seconds. Thereafter, bubbles formed on the surface of the beaker can be removed and introduced into a Microtrac particle size analyzer (for example, Model 9320-X100 manufactured by Nikkiso Co., Ltd.) for measurement.
• a Microtrac particle size analyzer for example, Model 9320-X100 manufactured by Nikkiso Co., Ltd.
• the shape of the hard ferrite particles is not particularly limited, but is preferably spherical. More specifically, the ferrite powder preferably contains 80% by number or more of hard ferrite particles having a sphericity of 1 or more and 1.2 or less.
• the sphericity can be determined as follows. First, using a scanning electron microscope (for example, FE-SEM (SU-8020, manufactured by Hitachi High-Technologies Corporation)), ferrite powder is photographed at a magnification of 100 to 20,000 times. Then, for the hard ferrite particles constituting the ferrite powder, the circumscribed circle diameter and the inscribed circle diameter are obtained from the photographed SEM image, and the ratio (circumscribed circle diameter / inscribed circle diameter) is obtained as the sphericity. If the two diameters are the same, i.e. a true sphere, this ratio is 1.
• the ferrite powder of the present invention may contain other particles in addition to the hard ferrite particles as described above.
• hard ferrite particles that do not satisfy the conditions as described above may be included, or soft ferrite particles may be included.
• the particles constituting the ferrite powder may be subjected to a surface treatment.
• the surface treatment agent used for the surface treatment of the particles include a silane coupling agent, a phosphoric acid compound, a carboxylic acid, and a fluorine compound.
• the aggregation of the particles can be more effectively prevented, and the flow of the ferrite powder and the resin composition containing the ferrite powder can be prevented.
• Property and ease of handling can be further improved.
• grains in a molded object can be improved more in a resin composition.
• the silane coupling agent for example, a silane compound having a silyl group and a hydrocarbon group can be used.
• the silane coupling agent has an alkyl group having 8 to 10 carbon atoms as the alkyl group. It is preferable.
• the hard ferrite particles can be further effectively prevented, and the fluidity and ease of handling of the ferrite powder and the resin composition containing the ferrite powder can be further improved. Moreover, the dispersibility of the hard ferrite particles in the molded body in the resin composition can be further improved.
• Examples of the phosphoric acid compound include lauryl phosphate, lauryl-2-phosphate, steareth-2 phosphate, phosphate ester of 2- (perfluorohexyl) ethylphosphonic acid, and the like.
• carboxylic acid for example, a compound having a hydrocarbon group and a carboxyl group (fatty acid) can be used. Specific examples of such compounds include decanoic acid, tetradecanoic acid, octadecanoic acid, cis-9-octadecenoic acid and the like.
• fluorine compound examples include a silane coupling agent as described above, a phosphoric acid compound, and a compound having a structure in which at least a part of hydrogen atoms of the carboxylic acid is substituted with a fluorine atom (fluorine silane compound, fluorine A phosphoric acid compound and a fluorine-substituted fatty acid).
• the residual magnetization of the ferrite powder by VSM measurement when a magnetic field of 10 K ⁇ 1000 / 4 ⁇ A / m is applied is preferably 25 A ⁇ m 2 / kg or more and 40 A ⁇ m 2 / kg or less, and 27 A ⁇ m 2 / kg. More preferably, it is 38 A ⁇ m 2 / kg or less.
• the molded body may be easily detected by a metal detector. It becomes insufficient.
• the content rate of the ferrite powder in a molded object is raised in order to improve the ease of detection by a metal detector, the toughness and strength of the molded object are likely to decrease.
• the remanent magnetization exceeds the above upper limit value, the adjustment of the composition of the ferrite powder becomes complicated in order to realize the magnetic characteristics, and it becomes difficult to stably obtain excellent characteristics. Moreover, even if the remanent magnetization exceeds the upper limit, practically, it is not possible to further improve the ease of detection of the ferrite powder or a molded body containing the ferrite powder by a metal detector.
• the saturation magnetization of the ferrite powder by VSM measurement when a magnetic field of 10 K ⁇ 1000 / 4 ⁇ A / m is applied is preferably 45 A ⁇ m 2 / kg or more and 70 A ⁇ m 2 / kg or less, and 47 A ⁇ m 2 / kg. More preferably, it is 65 A ⁇ m 2 / kg or less.
• the saturation magnetization is less than the lower limit, the content of the ferrite powder in the molded body produced using the ferrite powder is not increased, and the metal detector is not easily detected. Become. Moreover, when the content rate of the ferrite powder in a molded object is raised in order to improve the ease of detection by a metal detector, the toughness and strength of the molded object are likely to decrease.
• the saturation magnetization exceeds the above upper limit value, the adjustment of the composition of the ferrite powder and the like are complicated in order to realize the magnetic characteristics, and it becomes difficult to obtain stable and excellent characteristics. Moreover, even if the saturation magnetization exceeds the upper limit, practically no further improvement in the ease of detection of the ferrite powder or a molded body containing the ferrite powder by a metal detector cannot be expected.
• the coercive force of the ferrite powder by VSM measurement when a magnetic field of 10 K ⁇ 1000 / 4 ⁇ A / m is applied is preferably 39.7 kA / m or more and 320 kA / m or less, and 55 kA / m or more and 280 kA / m or less. Is more preferable.
• the coercive force is less than the lower limit value, when the molded body manufactured using the ferrite powder of the present invention is magnetized, sufficient magnetization cannot be performed, and the molded body is detected by a metal detector. This is not preferable because the ease of detection may be reduced.
• the adjustment of the composition of the ferrite powder becomes complicated in order to realize the magnetic characteristics, and it becomes difficult to stably obtain excellent characteristics. Further, even if the coercive force exceeds the upper limit, practically, it is not possible to further improve the ease of detection of the ferrite powder or a molded body containing the ferrite powder by a metal detector.
• the said magnetic characteristic can be calculated
• the amount of Cl (chlorine) measured by ion chromatography in the hard ferrite powder is preferably 1 ppm or more and 100 ppm or less, and more preferably 1 ppm or more and 50 ppm or less.
• the amount of Cl is small, the Cl component derived from impurities contained in the raw material cannot be completely removed.
• the measurement of the Cl amount (chloride ion amount) in the hard ferrite powder can be obtained, for example, by combustion method ion chromatography.
• Combustion method ion chromatography can be performed, for example, under the following conditions.
• -Combustion device AQF-2100H manufactured by Mitsubishi Chemical Analytech Co., Ltd.
• -Sample amount 50mg -Combustion temperature: 1100 ° C
• Combustion time 10 minutes-Ar flow rate: 400 ml / min -O 2 flow rate: 200 ml / min -Humidification Air flow rate: 100ml / min -Absorbent: Eluent containing 1% hydrogen peroxide
• IC-2010 manufactured by Tosoh Corporation -Column: TSKgel SuperIC-Anion HS (4.6 mm ID ⁇ 1 cm + 4.6 mm ID ⁇ 10 cm) - Eluent: NaHCO 3 (3.8mmol / L) + Na 2 CO 3 (3.0mmol / L) -Flow rate: 1.5mL / min -Column temperature: 40 ° C -Injection volume: 30 ⁇ L -Measurement mode: Suppressor method-Detector: CM detector-Standard sample: Anion mixed standard solution manufactured by Kanto Chemical Co., Inc.
• the amount of S (sulfur) measured by ion chromatography in the hard ferrite powder is preferably 1 ppm or more and 1000 ppm or less, and more preferably 1 ppm or more and 200 ppm or less.
• the molded product can be produced in a stable state and can be used in a stable state for a long period of time.
• the amount of S is small, the S component derived from impurities contained in the raw material cannot be completely removed.
• the amount of S exceeds the upper limit, when ferrite powder is used as the filler, the viscosity tends to increase when mixed with the resin material, or it reacts with another additive, and the molded product is formed over a long period of time. There is a possibility that the molded body may be deteriorated during use.
• the ferrite powder of the present invention may be produced by any method, but can be suitably produced, for example, by the method described below. That is, first, Fe 2 O 3 and SrCO 3 are dry mixed as raw materials.
• Dry mixing is performed by, for example, using a Henschel mixer and the like for mixing for 1 minute or longer, preferably 3 minutes or longer and 60 minutes or shorter for granulation.
• the granulated product thus obtained is fired.
• the granulated product can be fired using, for example, a stationary electric furnace.
• Calcination conditions are not particularly limited.
• the temperature can be 1050 ° C. or more and 1250 ° C. or less
• the calcination time can be 2 hours or more and 8 hours or less (peak).
• the fired product obtained by firing is wet pulverized by a bead mill or the like, washed, dehydrated, dried, and then subjected to heat treatment.
• the conditions for the heat treatment are not particularly limited, for example, the temperature may be 750 ° C. or more and 1050 ° C. or less, and the heating time may be 0.1 hours or more and 2 hours or less.
• the ferrite powder contains other particles in addition to the hard ferrite particles as described above, the powder containing a plurality of hard ferrite particles obtained as described above and other particles are mixed. By doing so, the target ferrite powder can be obtained.
• the resin composition of the present invention contains the ferrite powder of the present invention as described above and a resin material.
• the ferrite powder may be contained in any form, but is preferably present dispersed in the resin material.
• the ease of handling of the resin composition is further improved, and the molded body to be described in detail later can be more suitably molded.
• the content rate of the ferrite powder in a resin composition is not specifically limited, It is preferable that it is 5.0 mass% or more and 90 mass% or less, and it is more preferable that it is 7.0 mass% or more and 88 mass% or less.
• the moldability of the molded body can be further improved, the toughness, strength, reliability, etc. of the molded body can be further improved, and the ease of detection by the metal detector of the molded body can be improved. Stability can be further improved.
• the content of the ferrite powder in the resin composition is less than the lower limit, depending on the composition of the hard ferrite particles, etc., the ease of detection by the metal detector of the molded product, the stability of detection may be It may be insufficient.
• the ferrite powder content in the resin composition exceeds the upper limit, the moldability of the molded body is lowered, and the toughness, strength, reliability, and the like of the molded body may be lowered.
• resin material contained in the resin composition for example, various thermoplastic resins, various curable resins, and the like can be used.
• polyolefin such as polyethylene, polypropylene, poly- (4-methylpentene-1), ethylene-propylene copolymer, cyclic polyolefin; modified polyolefin; polystyrene; butadiene-styrene copolymer; acrylonitrile— Butadiene-styrene copolymer (ABS resin); acrylonitrile-styrene copolymer (AS resin); polyvinyl chloride; polyvinylidene chloride; ethylene-vinyl acetate copolymer (EVA); polyamide (eg, nylon 6, nylon 46) , Nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, nylon 6-12, nylon 6-66); polyimide; polyamideimide; acrylic resin such as polymethyl methacrylate; polycarbonate (PC); eye Polymer alcohol (PVA); ethylene-vinyl alcohol copolymer (EVOH); polyethylene terephthalate (PET),
• Polyether Polyacetal (POM); Polyphenylene oxide; Modified polyphenylene oxide; Polyetherketone (PEK); Polyetheretherketone (PEEK); Polyetherimide; Polysulfone; Polyethersulfone; Polyphenylenesulfide; Polytetrafluoro Fluorine resins such as ethylene and polyvinylidene fluoride; silicone rubber, isoprene rubber, butadiene rubber, nitrile rubber, natural rubber, etc.
• Rubber materials Various thermoplastic elastomers such as styrene, polyolefin, polyvinyl chloride, polyurethane, polyester, polyamide, polybutadiene, trans polyisoprene, fluororubber, chlorinated polyethylene; epoxy resin; phenol Resins; Urea resins; Melamine resins; Unsaturated polyesters; Silicone resins; Polyurethanes, etc., and copolymers, blends, polymer alloys, etc. mainly composed of these, and combinations of one or more of these Can be used.
• thermoplastic elastomers such as styrene, polyolefin, polyvinyl chloride, polyurethane, polyester, polyamide, polybutadiene, trans polyisoprene, fluororubber, chlorinated polyethylene; epoxy resin; phenol Resins; Urea resins; Melamine resins; Unsaturated polyesters; Silicone resins; Polyurethanes, etc., and copoly
• the resin materials contained in the resin composition are polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol (PVA), fluororesin, silicone rubber, butadiene rubber, thermoplastic elastomer, epoxy resin, and silicone resin. It is preferable to include one or more selected from the group consisting of:
• the dispersion stability of the ferrite powder in the resin composition is further improved, and the moldability of the molded body can be further improved.
• the toughness, strength, reliability and the like of the molded body can be further improved.
• the adhesion to various resins is improved, further improving the dispersion stability of the ferrite powder in the resin composition.
• the moldability of the molded body can be further improved.
• the resin material contained in the resin composition may have a composition different from that of the resin material contained in the molded body produced using the resin composition.
• the resin material contained in the resin composition may be a precursor (for example, a monomer, dimer, trimer, oligomer, prepolymer, etc.) of the resin material contained in the final molded body.
• the content of the resin material in the resin composition is not particularly limited, but is preferably 8.0% by mass to 95% by mass, and more preferably 10% by mass to 90% by mass.
• the moldability of the molded body can be further improved, the toughness, strength, reliability, etc. of the molded body can be further improved, and the ease of detection by the metal detector of the molded body can be improved. Stability can be further improved.
• the content of the resin material in the resin composition is less than the lower limit, the moldability of the molded body is lowered, and the toughness, strength, reliability, etc. of the molded body may be lowered. .
• the content of the resin material in the resin composition exceeds the upper limit, the content of the ferrite powder is relatively decreased, and depending on the composition of the hard ferrite particles, the metal detector of the molded product can be detected.
• the stability of detection may be insufficient.
• the resin composition of the present invention only needs to contain ferrite powder and a resin material, and may further contain other components (other components).
• Such components include various colorants such as pigments and dyes, various fluorescent materials, various phosphorescent materials, various phosphorescent materials, solvents, infrared absorbing materials, ultraviolet absorbers, dispersants, and surfactants.
• the resin composition of the present invention may be in any form, and examples of the resin composition include powders, pellets, dispersions, slurries, gels, etc., but pellets are preferred.
• the ease of handling of the resin composition is further improved, and a molded article using the resin composition can be more suitably produced.
• the storage stability of the resin composition can be further improved, and deterioration of the constituent components of the resin composition during storage can be more effectively prevented.
• the volume average particle size is preferably 1 mm or more and 10 mm or less, and more preferably 2 mm or more and 7 mm or less.
• the resin composition of the present invention can be produced, for example, by mixing the ferrite powder and the resin material described above.
• Mixing of ferrite powder and resin material is, for example, a mixing device (kneading device) such as a planetary mixer, a twin screw mixer, a kneader, a Banbury mixer, a stirring kneader such as an oven roll, a single screw extruder, a twin screw extruder, etc. It can carry out suitably by using.
• a mixing device such as a planetary mixer, a twin screw mixer, a kneader, a Banbury mixer, a stirring kneader such as an oven roll, a single screw extruder, a twin screw extruder, etc. It can carry out suitably by using.
• the molded product of the present invention has a portion formed using the resin composition of the present invention as described above.
• the strength, durability, etc. of the molded body can be further improved.
• an external force such as tension or bending is applied, particularly when a large external force is applied. Even when an external force is repeatedly applied, it is more effectively prevented that a part of the molded body is detached due to cutting or the like. Therefore, it is possible to more effectively prevent a part of the molded body from being mixed into the product or the like as a foreign substance.
• the molded body of the present invention only needs to have at least a part formed using the resin composition of the present invention, and the whole may be formed using the resin composition of the present invention. And in addition to the site
• it has a base portion made of a material other than the resin composition of the present invention, and a surface layer provided on the surface of the base portion and formed using the resin composition of the present invention. It may be.
• the molded article of the present invention may be molded by mixing, for example, the resin composition of the present invention and another resin composition (a composition not containing the ferrite powder of the present invention).
• the molded body preferably contains at least the ferrite powder near the surface thereof.
• the molded body preferably contains ferrite powder in a region within 1.0 mm in the thickness direction from the surface, and ferrite powder in a region within 0.5 mm in the thickness direction from the surface. It is more preferable that it contains.
• the vicinity of the surface of the molded body is a part that is particularly easily detached from the molded body. Therefore, the effect of the present invention is more remarkably exhibited by including ferrite powder in such a region.
• Such a molded body is suitable, for example, by applying a magnetic field from the direction that should be the surface of the molded body when the molded body is molded (the resin material constituting the resin composition is softened or melted). Can be manufactured.
• the above-described ferrite can be unevenly distributed in the vicinity of the surface of the molded body, and the effects as described above can be exhibited more remarkably.
• the content of the ferrite powder in the molded body of the present invention varies depending on the usage of the molded body, but is preferably 2.0% by mass or more and 20% by mass or less, and 2.5% by mass or more and 18% by mass or less. It is more preferable that
• the toughness, strength, reliability and the like of the molded body can be further improved, and the ease of detection of the molded body by a metal detector and the stability of detection can be further improved.
• the molded body does not contain the ferrite powder (that is, other than the resin composition of the present invention).
• the above-described conditions for the content of ferrite powder are satisfied in the portion containing the ferrite powder.
• the molded body of the present invention may be used for the purpose of detection by a metal detector, in other words, all or part of the molded body (for example, a section of the molded body) may be applied to inspection by a metal detector.
• the molded article of the present invention can be used for, for example, food production, processing, and packaging (including packaging, the same applies hereinafter), cosmetics, and quasi-drugs. Manufacturing, processing, packaging site, pharmaceutical manufacturing, processing, packaging site, products other than the above, processing, packaging site, medical site, cell culture, tissue culture, organ culture, genetic recombination And the like for use in the field of performing biological treatment such as, and for use in the field of performing chemical treatment such as synthesis of compounds.
• the molded article of the present invention is preferably used in the field of food production, processing, and packaging.
• articles used in food manufacturing and processing sites include many articles that are applied to microwave ovens (for example, various cooking utensils, various containers, trays, wrap films, etc.). Since ferrite, which is a metal material, is used, it can be suitably adapted to the use of a microwave oven.
• the form of food in addition to solid form and semi-solid form (gel form of jelly, pudding, etc.), the form of food includes liquid, and the concept of food includes drinks and the like.
• Food additives and supplements are also included in the concept of food.
• natural products such as animal-derived meat, seafood, plant-derived vegetables, fruits, seeds, grains, beans, seaweed, and processed products thereof, artificial sweeteners, artificial seasonings such as artificial seasonings, etc.
• New synthetic products are also included in the concept of food.
• Examples of molded products used in the production and processing of food include cooking appliances, cooking utensils, cooking utensils, tableware, clothing (articles worn on the human body), and packaging members used for food packaging And articles used in association therewith, as well as articles used for maintenance and repair of these.
• hot plate hot plate, stove, gas burner, oven, toaster, microwave oven, dishwasher, dish dryer, scale (scale), kitchen timer, thermometer, water purifier, water purification filter (cartridge) Cooking equipment such as: pots, pans, kettles, lids, knives, scissors, ladle, spatula, peeler, slicer, mixer, chopper, masher, rolling pin, mudler, whisk, sieve, bowl, drainer Bowl, cutting board, mat, rice paddle, mold, die cutting, lye removal, grater (food grader), frying (turner), pick, drainer, sieve, mill, drop lid, ice tray, grill, tongs, egg slicer Cooking utensils such as bowls, measuring cups, measuring spoons; towels, kitchen paper, towels, towels, paper towels Cooking utensils such as draining sheets, wrap film, oven paper, squeezed bags, virtues, pans, etc .; dishes, cups, bowls, chopsticks (including chopsticks), spoons,
• the molded article of the present invention is preferably used for some or all of cooking utensils, cooking utensils, and food packaging members.
• such a molded body has a high possibility that at least a part of the molded body will be mixed into the food, particularly in the production, processing, and packaging sites of the food. Therefore, when the present invention is applied to the molded body as described above, the effects of the present invention are more remarkably exhibited.
• Various molding methods can be used as a method for producing a molded body, such as an injection molding method (insert molding method, multicolor molding method, sandwich molding method, injection molding method, etc.), extrusion molding method, inflation molding method, Examples include a T-die film molding method, a laminate molding method, a blow molding method, a hollow molding method, a compression molding method, a calendar molding method and the like, an optical molding method, a three-dimensional layered molding method, and the like.
• an injection molding method insert molding method, multicolor molding method, sandwich molding method, injection molding method, etc.
• extrusion molding method inflation molding method
• Examples include a T-die film molding method, a laminate molding method, a blow molding method, a hollow molding method, a compression molding method, a calendar molding method and the like, an optical molding method, a three-dimensional layered molding method, and the like.
• the resin composition contains a curable resin
• a curing reaction of the curable resin is performed.
• the curing reaction varies depending on the type of the curable resin and the like, but can be performed by heating or irradiation with energy rays such as ultraviolet rays.
• a resin material for dilution may be used in addition to the resin composition of the present invention.
• the molded body has a base formed using a material other than the resin composition described above, and a surface layer provided on the base and formed using the resin composition of the present invention, the above Such as casting, forging, powder injection molding method (PIM (Powder Injection Molding)), etc. You may use and form a surface layer.
• PIM Powder injection molding method
• it may be magnetized when the molded body is molded. Thereby, it is possible to further improve the ease of detection of the formed body by the metal detector and the stability of the detection.
• the molded body may be manufactured by subjecting the molded body obtained by the above-described molding method to post-treatment such as grinding and polishing.
• the resin composition of the present invention in the resin composition, the case where the ferrite powder is dispersed and present in the resin material has been mainly described, but in the resin composition of the present invention, for example, the ferrite powder is It settles in the liquid and may be used after being dispersed by stirring or the like, if necessary.
• the resin composition of the present invention may be a dispersion in which ferrite powder and resin particles are dispersed in a volatile liquid.
• the resin composition of the present invention may have a configuration in which, for example, ferrite powder and resin powder are simply mixed.
• Example A1 Fe 2 O 3 and SrCO 3 were prepared, and these were put into a Henschel mixer at a molar ratio of 5.6: 1.0, and dry-mixed and granulated for 10 minutes.
• the obtained granulated product was fired in the atmosphere at 1075 ° C. for 4 hours (peak).
• the fired product obtained by the above firing is wet pulverized using a bead mill at a solid content of 60% by mass for 30 minutes, washed, dehydrated, dried, and then in the atmosphere at 850 ° C. for 1 hour (peak). Heat treatment was performed to obtain ferrite powder.
• the Sr content in the particles (hard ferrite particles) constituting the ferrite powder thus obtained was 8.78% by mass, and the Fe content was 62.3% by mass.
• the content of metal elements (Fe, Sr, etc.) in the particles constituting the ferrite powder was determined as follows. Specifically, 0.2 g of ferrite particles were weighed, a mixture of pure water: 60 ml with 1N hydrochloric acid: 20 ml and 1N nitric acid: 20 ml was heated to prepare an aqueous solution in which ferrite particles were completely dissolved, and ICP analysis was performed. The content of each metal element was determined by performing measurement using an apparatus (manufactured by Shimadzu Corporation, ICPS-1000IV). In addition, it calculated
• the volume average particle diameter of the constituent particles of the ferrite powder was 1.8 ⁇ m.
• the volume average particle diameter was determined by the following measurement. That is, first, ferrite powder as a sample: 10 g and water: 80 ml were placed in a 100 ml beaker, and two drops of a dispersant (sodium hexametaphosphate) were added. Subsequently, dispersion was performed using an ultrasonic homogenizer (UH-150 type manufactured by SMT Co Ltd). At this time, the output level of the ultrasonic homogenizer was set to 4, and dispersion was performed for 20 seconds.
• UH-150 type manufactured by SMT Co Ltd ultrasonic homogenizer
• the saturation magnetization ⁇ s 55.8 A ⁇ m 2 / kg
• the residual magnetization ⁇ r 33.4 A ⁇ m 2 / kg
• the coercive force Hc. 285 kA / m.
• the above magnetic properties were obtained as follows. That is, first, ferrite powder was packed in a cell having an inner diameter of 5 mm and a height of 2 mm, and set in a vibration sample type magnetic measuring device (VSM-C7-10A manufactured by Toei Kogyo Co., Ltd.). Next, an applied magnetic field was applied, sweeping was performed to 10K ⁇ 1000 / 4 ⁇ ⁇ A / m, and then the applied magnetic field was decreased to prepare a hysteresis curve. Thereafter, the saturation magnetization ⁇ s, the residual magnetization ⁇ r, and the coercive force Hc were obtained from the data of this curve. In addition, it calculated
• the cation content of the hard ferrite powder was measured as follows. First, 10 ml of ultrapure water (Direct-Q UV3 manufactured by Merck & Co., Inc.) was added to 1 g of ferrite powder, and ultrasonic components were irradiated for 30 minutes to extract ionic components. Next, the supernatant of the obtained extract was filtered through a pretreatment disposable disk filter (W-25-5, Tosoh Corporation, pore size 0.45 ⁇ m) to obtain a measurement sample. Next, the ion component contained in the measurement sample was quantitatively analyzed by ion chromatography under the following conditions, and converted to the ferrite powder content.
• ultrapure water Direct-Q UV3 manufactured by Merck & Co., Inc.
• IC-2010 manufactured by Tosoh Corporation -Column: TSKgel SuperIC-Cation HSII (4.6 mm ID ⁇ 1 cm + 4.6 mm ID ⁇ 10 cm) -Eluent: Methanesulfonic acid (3.0 mmol / L) + 18-crown 6-ether (2.7 mmol / L) -Flow rate: 1.0 mL / min -Column temperature: 40 ° C -Injection volume: 30 ⁇ L -Measurement mode: Non-suppressor system-Detector: CM detector-Standard sample: Cation mixed standard solution manufactured by Kanto Chemical Co., Inc.
• the anion content was measured by quantitative analysis of the anion component contained in the ferrite powder by the combustion method ion chromatography under the following conditions.
• -Combustion device AQF-2100H manufactured by Mitsubishi Chemical Analytech Co., Ltd.
• -Sample amount 50mg -Combustion temperature: 1100 ° C
• Combustion time 10 minutes-Ar flow rate: 400 ml / min -O 2 flow rate: 200 ml / min -Humidification Air flow rate: 100ml / min -Absorbent: Eluent containing 1% hydrogen peroxide
• IC-2010 manufactured by Tosoh Corporation -Column: TSKgel SuperIC-Anion HS (4.6 mm ID ⁇ 1 cm + 4.6 mm ID ⁇ 10 cm) - Eluent: NaHCO 3 (3.8mmol / L) + Na 2 CO 3 (3.0mmol / L) -Flow rate: 1.5mL / min -Column temperature: 40 ° C -Injection volume: 30 ⁇ L -Measurement mode: Suppressor method-Detector: CM detector-Standard sample: Anion mixed standard solution manufactured by Kanto Chemical Co., Inc.
• Examples A2, A3 Ferrite powder was produced in the same manner as in Example A1, except that the ratio of materials used for the production of the granulated material was as shown in Table 1.
• Example A4 Fe 2 O 3 and SrCO 3 were prepared, and these were mixed at a molar ratio of 5.75: 1.0. Next, this mixture was pulverized for 4.5 hours with a dry media mill (vibration mill, 1/8 inch diameter stainless steel beads), and the obtained pulverized product was formed into pellets of about 1 mm square using a roller compactor. After removing the coarse powder with a vibrating sieve having a mesh opening of 3 mm and then removing the fine powder with a vibrating sieve having a mesh opening of 0.5 mm, the pellets are heated at 1080 ° C. for 3 hours in a rotary electric furnace and temporarily fired. The preliminary sintered body was obtained.
• the obtained slurry was spray-dried with a spray dryer to obtain a granulated product. Then, the particle size adjustment of the obtained granulated material was performed, and further, it heated at 650 degreeC for 2 hours with the rotary electric furnace, and the binder was removed.
• the obtained granulated product was fired in the atmosphere at 1185 ° C. for 4 hours (peak), and further pulverized and classified to obtain ferrite powder.
• the Sr content in the particles (hard ferrite particles) constituting the ferrite powder thus obtained was 8.52% by mass, and the Fe content was 62.7% by mass.
• the volume average particle diameter of the constituent particles of the ferrite powder was 15.0 ⁇ m. Further, when the ferrite powder was measured using a vibration sample type magnetometer (VSM-C7-10A manufactured by Toei Kogyo Co., Ltd.), the saturation magnetization ⁇ s: 55.3 A ⁇ m 2 / kg, the residual magnetization ⁇ r: It was 32.4 A ⁇ m 2 / kg and the coercive force Hc: 161 kA / m.
• Example A5 Ferrite powder was produced in the same manner as in Example A4 except that the conditions for the pulverization treatment for the temporary sintered body, the conditions for spray drying using a spray dryer, and the conditions for adjusting the particle size for the granulated product were changed.
• the volume average particle diameter of the constituent particles of the ferrite powder thus obtained was 39.0 ⁇ m.
• ferrite powder containing a plurality of particles having a composition containing Ba instead of Sr was produced as follows.
• Fe 2 O 3 and BaCO 3 were prepared, and these were put into a Henschel mixer at a molar ratio of 5.75: 1.0, and dry-mixed and granulated for 10 minutes.
• the obtained granulated product was fired in the atmosphere at 1075 ° C. for 4 hours (peak).
• the fired product obtained by the above firing was wet pulverized with a bead mill at a solid content of 60% by mass for 30 minutes, washed, dehydrated, dried, and then heat treated at 850 ° C. for 1 hour in air. Ferrite powder was obtained.
• the Ba content in the particles (hard ferrite particles) constituting the ferrite powder thus obtained was 12.81% by mass, and the Fe content was 59.94% by mass.
• Comparative Example A1 Fe 2 O 3 and carbon black (C) are used as raw materials for the production of the granulated product, and the main sintering process is performed in a nitrogen atmosphere at 1000 ° C. for 4 hours (peak) and applied to the pulverized product by wet pulverization.
• a ferrite powder was produced in the same manner as in Example A1, except that the heat treatment was omitted.
• the manufacturing conditions of the ferrite powders of the respective examples and comparative examples described above are shown together in Table 1, and the characteristics and the like of the ferrite powder are shown together in Table 2.
• the proportion of particles having a sphericity of 1 or more and 1.2 or less was 90% by number or more.
• the proportion of particles having a sphericity of 1 or more and 1.2 or less was less than 1% by number. The sphericity was determined as follows.
• the ferrite powder was photographed at a magnification of 200,000 times using a scanning electron microscope (for example, FE-SEM (SU-8020, manufactured by Hitachi High-Technology Corporation)).
• FE-SEM FE-SEM (SU-8020, manufactured by Hitachi High-Technology Corporation)
• the circumscribed circle diameter and the inscribed circle diameter were determined for the hard ferrite particles constituting the ferrite powder from the photographed SEM image, and the ratio (circumscribed circle diameter / inscribed circle diameter) was determined as the sphericity.
• Example B1 Using a kneader and a pelletizer, the ferrite powder produced in Example A1 and polypropylene as a resin material were mixed, kneaded, and granulated at a mass ratio of 5.0: 95.0. This obtained the resin composition as a pellet whose volume average particle diameter is 3 mm.
• Examples B2 to B5 A resin composition as a pellet was obtained in the same manner as in Example B1, except that the blending ratio of ferrite powder and polypropylene was changed as shown in Table 3.
• Example B6 Using a kneader and a pelletizer, the ferrite powder produced in Example A1, polypropylene as a resin material, and silica as a white pigment (manufactured by Nippon Aerosil Co., Ltd., AEROSIL 200) in a mass ratio of 2.0: 93 Mixing, kneading and granulation at 0.0: 5.0. This obtained the resin composition as a pellet whose volume average particle diameter is 3 mm.
• Example B7 and B8 A resin composition as a pellet was obtained in the same manner as in Example B6 except that the blending ratio of ferrite powder, polypropylene, and silica was changed as shown in Table 3.
• Examples B9 to B13 A resin composition as a pellet was obtained in the same manner as in Example B8 except that the type of ferrite powder and the type of resin material were as shown in Table 3.
• Example B14 A resin composition as a pellet was obtained in the same manner as in Example B8 except that the type of ferrite powder was changed to the ferrite powder produced in Example A6.
• Example B15 Using a ball mill, the ferrite powder produced in Example A4, the nylon resin powder, and the silica particles as the white pigment were mixed at the same mass ratio as in Example B12 to obtain a powdery resin composition. Obtained.
• Example B16 A powdery resin composition was obtained in the same manner as in Example B15 except that the types of resin materials were as shown in Table 3.
• Comparative Example B1 A resin composition as a pellet was obtained in the same manner as in Example B6 except that the type of ferrite powder was changed to the ferrite powder produced in Comparative Example A1 and the blending amount of each component was changed.
• Comparative Example B2 A resin composition as a pellet was obtained in the same manner as in Example B3 except that the type of ferrite powder was changed to the ferrite powder produced in Comparative Example A2.
• Example B4 A resin composition as a pellet was obtained in the same manner as in Example B6 except that iron powder (metal powder) was used instead of ferrite powder and the blending amount of each component was changed.
• Table 3 summarizes the conditions of the resin compositions of the respective examples and comparative examples described above.
• the column of MFR in Table 3 shows the value of the melt flow rate (MFR) when measured under the conditions of temperature: 190 ° C. and load: 2.16 kg based on JIS K 7210.
• ⁇ 3 Manufacture of molded body (Example C1) Using a kneader and a T-die, the resin composition (pellet) produced in Example B1 was melted and molded to obtain a sheet-like molded body having a thickness of 100 ⁇ m.
• Examples C2, C3 A sheet-like molded body was produced in the same manner as in Example C1, except that the pellets produced in Examples B2 and B3 were used instead of the pellets produced in Example B1. did.
• Example C4 Using a kneader, the resin composition (pellet) produced in Example B4 was melted and injection molded into a molding die to obtain a plate-like molded body having a thickness of 2 mm.
• Example C5 Using a kneader, the resin composition (pellet) produced in Example B5 was melted and injection molded into a molding die to obtain a plate-like molded body having a thickness of 2 mm.
• Examples C6 to C14 A sheet-like molded body was produced in the same manner as in Example C1, except that the pellets produced in Examples B6 to B14 were used instead of the pellets produced in Example B1. did.
• Example C15 The ferrite powder produced in Example A1 and SiO 2 were dispersed in a PVA aqueous solution having a solid content of 10% by mass, and coated and dried using an applicator to obtain a sheet-like molded body having a thickness of 100 ⁇ m. At this time, the mass ratio of the solid content of PVA, ferrite powder, and SiO 2 was 75.0 mass%, 20.0 mass%, and 5.0 mass%, respectively.
• Example C16 The ferrite powder produced in Example A4, a liquid epoxy resin, a polymerization initiator, a boron trifluoride monoethylamine complex as a curing agent, and silica as a white pigment (manufactured by Nippon Aerosil Co., Ltd., AEROSIL 200). After mixing, the mixture was poured into a mold made of silicone resin. Then, it heated at 120 degreeC, the epoxy resin was hardened, and the disk-shaped molded object of diameter: 13mm and thickness: 2.0mm was manufactured.
• the content of the ferrite powder in the obtained molded body was 20.0% by mass, the content of the resin material was 75.0% by mass, and the content of the colorant was 5.0% by mass.
• Example C17 The ferrite powder produced in Example A1, the olefinic thermoplastic elastomer, and titanium dioxide particles as a white pigment were mixed, and this mixture was poured into a silicone resin mold. Then, it heated at 120 degreeC and manufactured the disk-shaped molded object of diameter: 13mm and thickness: 2.0mm.
• the content of the ferrite powder in the obtained molded body was 20.0% by mass, the content of the resin material was 75.0% by mass, and the content of the colorant was 5.0% by mass.
• Example C18 and C19 A disc-shaped molded body was produced in the same manner as in Example C17 except that the type of the resin material was changed as shown in Table 4.
• Example C20 The ferrite powder produced in Example A1, the silicone resin, and the titanium dioxide particles as the white pigment have a ferrite powder content of 20.0% by mass and a resin material content of 75.0% in the molded body.
• the mixture was mixed so that the content of the colorant (pigment) was 5.0% by mass, and this mixture was poured into a mold made of silicone resin.
• a silicone resin diluted with an organic solvent to a solid content of 20% by weight was used.
• the organic solvent was evaporated by heating the entire mold at 65 ° C. and then heated to 120 ° C. to cure the silicone resin to produce a disk-shaped molded body having a diameter of 13 mm and a thickness of 2.0 mm.
• Example C21 A disk-shaped molded body was produced in the same manner as in Example C20 except that the type of the resin material was changed as shown in Table 4.
• Example C22 The resin composition (powder) produced in Example B15 was charged into a mold and then pressed, then removed from the mold, heated at 180 ° C. for 4 hours to be melted and cured, diameter: 13 mm, thickness: 2 A disc-shaped molded body of 0.0 mm was manufactured.
• Example C23 The resin composition (powder) produced in Example B16 was charged into a mold and then pressed, then removed from the mold, heated at 180 ° C. for 4 hours to be melted and cured, diameter: 13 mm, thickness: 2 A disc-shaped molded body of 0.0 mm was manufactured.
• ⁇ 4 Evaluation of Molded Body ⁇ 4-1 >> Detection by Metal Detector
• a belt conveyor type metal detector (META-HAWKII, manufactured by System Square Co., Ltd.) was used for the molded body manufactured in each of the above-described Examples and Comparative Examples.
• the sensitivity level meter (F value, S value), iron ball sensitivity, SUS ball sensitivity) capable of detecting the molded body was determined.
• ⁇ 4-2 Presence / absence of abnormal heating during microwave irradiation
• a commercially available microwave oven was used to confirm the presence / absence of abnormal heating during microwave irradiation.
• the condition of each molded body at this time was evaluated according to the following criteria.
• the ferrite powder of the present invention is a ferrite powder that can be detected by a metal detector, wherein Sr is 7.8 mass% or more and 9.0 mass% or less, Fe is 61.0 mass% or more and 65.0 mass% or less, Contains hard ferrite particles. Therefore, it is possible to provide a ferrite powder that can be suitably used for manufacturing a molded body that can be stably detected by a metal detector. Therefore, the ferrite powder of the present invention has industrial applicability.

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