WO2024128318A1 - 球状アルミナ粉末 - Google Patents

球状アルミナ粉末 Download PDF

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Publication number
WO2024128318A1
WO2024128318A1 PCT/JP2023/045121 JP2023045121W WO2024128318A1 WO 2024128318 A1 WO2024128318 A1 WO 2024128318A1 JP 2023045121 W JP2023045121 W JP 2023045121W WO 2024128318 A1 WO2024128318 A1 WO 2024128318A1
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Prior art keywords
alumina powder
spherical alumina
cup
measured
less
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English (en)
French (fr)
Japanese (ja)
Inventor
直嗣 野上
輝洋 相京
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Denka Co Ltd
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Denka Co Ltd
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Priority to JP2024564450A priority Critical patent/JPWO2024128318A1/ja
Priority to KR1020257020203A priority patent/KR20250109766A/ko
Priority to CN202380086023.6A priority patent/CN120379936A/zh
Publication of WO2024128318A1 publication Critical patent/WO2024128318A1/ja
Anticipated expiration legal-status Critical
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/021—After-treatment of oxides or hydroxides
    • C01F7/022—Classification
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/021—After-treatment of oxides or hydroxides
    • C01F7/027—Treatment involving fusion or vaporisation
    • 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
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2002/00—Crystal-structural characteristics
    • C01P2002/60—Compounds characterised by their crystallite size
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/30—Particle morphology extending in three dimensions
    • C01P2004/32—Spheres
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/51—Particles with a specific particle size distribution
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/10—Solid density

Definitions

  • the present invention relates to spherical alumina powder.
  • Patent Document 1 describes spherical alumina powder with an average particle size (D50) of 50 ⁇ m or less and a sphericity of 0.9 or more (e.g., claim 1 of Patent Document 1).
  • the spherical alumina powder according to 1. A spherical alumina powder having a ⁇ -phase peak intensity ratio of 21% or more, calculated based on the formula [I ⁇ /(I ⁇ +I ⁇ +I ⁇ )] ⁇ 100 using I ⁇ , I ⁇ , and I ⁇ measured according to the above procedure. 3.
  • the spherical alumina powder according to 1. or 2. A spherical alumina powder having an alumina crystallite size of 400 nm or more and 800 nm or less, as measured by X-ray diffraction using Cu-K ⁇ . 4.
  • the overflowed powder was leveled off from the top of the cup, and the mass (g) of the spherical alumina powder filled in the cup was measured to calculate the compacted bulk density (g/ cm3 ). 5.
  • the spherical alumina powder according to any one of 1 to 4 When the loose bulk density measured by the above procedure is A and the hard bulk density is P, A spherical alumina powder having a degree of compression calculated based on ((P ⁇ A)/P) ⁇ 100 of 35% or more and 55% or less. 6.
  • the particle size at which the cumulative value is 25% is defined as D25
  • the particle size at which the cumulative value is 97% is defined as D97 .
  • the particle size at which the cumulative value is 50% is defined as D50
  • the particle size at which the cumulative value is 97% is defined as D97 .
  • the present invention provides spherical alumina powder that has excellent burr suppression and flowability when used in resin molding materials.
  • FIG. 2 is a schematic cross-sectional view showing the configuration of a thermal spraying device.
  • the spherical alumina powder of this embodiment will be described.
  • the spherical alumina powder of this embodiment is configured so that the ⁇ -phase peak intensity ratio measured according to the following procedure is 65% or less.
  • the ⁇ -phase peak intensity ratio and the ⁇ -phase peak intensity ratio of the spherical alumina powder can be measured according to the following procedure.
  • the ⁇ -phase peak intensity ratio (%) is calculated based on the formula 1: [I ⁇ /(I ⁇ +I ⁇ +I ⁇ )] ⁇ 100.
  • the ⁇ -phase peak intensity ratio is calculated based on the formula 2: [I ⁇ /(I ⁇ +I ⁇ +I ⁇ )] ⁇ 100.
  • the ⁇ -phase peak intensity ratio is calculated based on the formula 3: [I ⁇ /(I ⁇ +I ⁇ +I ⁇ )] ⁇ 100.
  • the surface condition of the spherical alumina powder in which the luminescence intensity ratio derived from the ⁇ crystal phase is controlled to a predetermined value or less, can realize appropriate viscoelastic properties in the resin molding material (resin composition) when mixed with resin, thereby improving the fluidity during molding.
  • the upper limit of the ⁇ -phase peak intensity ratio of the spherical alumina powder is 65% or less, preferably 64% or less, and more preferably 63% or less, which can improve the flowability when used in a resin molding material and can suppress the generation of burrs.
  • the lower limit of the ⁇ -phase peak intensity ratio is, for example, 30% or more, preferably 35% or more, and more preferably 40% or more, which can improve the thermal conductivity of the resin composition.
  • the lower limit of the ⁇ -phase peak intensity ratio of the spherical alumina powder is, for example, 21% or more, preferably 23% or more, more preferably 25% or more. This can improve the elastic modulus of the resin composition.
  • the upper limit of the ⁇ -phase peak intensity ratio is, for example, 35% or less, preferably 33% or less, more preferably 30% or less. This can improve the thermal conductivity of the resin composition.
  • the ⁇ -phase peak intensity ratio/ ⁇ -phase peak intensity ratio may be, for example, 0.30 or more and 0.99 or less, 0.35 or more and 0.95 or less, or 0.40 or more and 0.90 or less. This can improve the fluidity of the resin composition.
  • the crystallite size of the alumina obtained by X-ray diffraction measurement using Cu-K ⁇ may be, for example, 400 nm or more and 800 nm or less, 450 nm or more and 750 nm or less, or 500 nm or more and 700 nm or less. This can improve the bending strength of the resin composition.
  • the ⁇ -phase peak intensity ratio and the ⁇ -phase peak intensity ratio by appropriately selecting, for example, the raw material components of the spherical alumina powder and the manufacturing method of the spherical alumina powder.
  • factors for setting the ⁇ -phase peak intensity ratio and the ⁇ -phase peak intensity ratio in the desired numerical range include, for example, appropriately controlling the melting flame conditions such as the raw material supply amount, raw material particle size, flame temperature, combustible gas, combustion supporting gas, and dispersion gas, heating the raw material carrier gas, using alumina raw material powders of different particle sizes in combination, and appropriately adjusting the aperture during classification processing.
  • the spherical alumina powder may be configured so that the degree of compression calculated based on ((P-A)/P) x 100, where A is the loose bulk density and P is the compacted bulk density measured according to the following procedure, is, for example, 35% or more and 55% or less.
  • the loose bulk density, the hardened bulk density and the compressibility can be measured according to the following procedure under conditions of a room temperature of 25° C. and a humidity of 55%.
  • the spherical alumina powder is allowed to fall from a height of 25 cm at a rate of 5 to 10 g per minute into a 100 cm3 measuring cup, and the fall is continued until the powder overflows from the cup, to prepare a heaping cup.
  • the overflowing amount is leveled off without tapping, and then the mass (g) of the spherical alumina powder filled in the cup is measured to calculate the loose bulk density (g/cm 3 ).
  • the lower limit of the compression degree is, for example, 35% or more, preferably 38% or more, and more preferably 40% or more, which can improve the handleability of the spherical alumina powder.
  • the upper limit of the compression degree is, for example, 55% or less, preferably 53% or less, and more preferably 50% or less, which can improve the mixability of the resin and the spherical alumina powder.
  • the spherical alumina powder may be configured so as to have a loose bulk density (A) of 1.10 g/cm 3 or more and 1.50 g/cm 3 or less.
  • the lower limit of the loose bulk density (A) is, for example, 1.10 cm 3 /g or more, preferably 1.15 cm 3 /g or more, and more preferably 1.20 cm 3 /g or more. This improves the denseness and may improve the strength of the molded article of the resin molding material.
  • the upper limit of the loose bulk density (A) is, for example, 1.50 cm 3 /g or less, preferably 1.45 cm 3 /g or less, and more preferably 1.40 cm 3 /g or less, which can improve the mixability of the resin and the spherical alumina powder.
  • the volume frequency particle size distribution of the spherical alumina powder is measured by a wet laser diffraction scattering method, and in the obtained volume frequency particle size distribution, the particle size at which the cumulative value is 25% is defined as D25 , the particle size at which the cumulative value is 50% is defined as D50 , and the particle size at which the cumulative value is 97% is defined as D97 .
  • the lower limit of D 97 /D 25 is, for example, 8.0 or more, preferably 9.0 or more, and more preferably 10.0 or more, whereby the particle size distribution has a certain width, and the flowability and moldability can be improved.
  • the upper limit of D 97 /D 25 is, for example, 30.0 or less, preferably 20.0 or less, and more preferably 18.0 or less, whereby the particle size of the coarse particles becomes sharp, and molding defects in molded products due to the coarse particles can be suppressed.
  • the lower limit of D 97 /D 50 is, for example, 5.0 or more, preferably 5.5 or more, and more preferably 6.0 or more, whereby the particle size distribution has a certain width, and the flowability and moldability can be improved.
  • the upper limit of D 97 /D 50 is, for example, 20.0 or less, preferably 10.0 or less, and more preferably 8.0 or less, whereby the particle size of the coarse particles becomes sharp, and molding defects in the molded product due to the coarse particles can be suppressed.
  • the lower limit of D90 is, for example, 20.0 ⁇ m or more, preferably 25.0 ⁇ m or more, and more preferably 30.0 ⁇ m or more.
  • the upper limit of D90 is, for example, 80.0 ⁇ m or less, preferably 70.0 ⁇ m or less, and more preferably 60.0 ⁇ m or less.
  • the particle size distribution of the spherical alumina powder is a value based on particle size measurement by the laser diffraction light scattering method, and can be measured using a particle size distribution measuring device such as the "Model LS-13230" (manufactured by Beckman Coulter).
  • a particle size distribution measuring device such as the "Model LS-13230" (manufactured by Beckman Coulter).
  • water was used as the solvent, and as a pretreatment, the powder was dispersed for 1 minute using a homogenizer at 200 W output.
  • the PIDS (Polarization Intensity Differential Scattering) concentration was adjusted to 45-55%.
  • the refractive index of water was 1.33, and the refractive index of the powder was determined taking into account the refractive index of the powder material.
  • the refractive index of amorphous silica was 1.50
  • the refractive index of alumina was 1.68.
  • Spherical alumina powder is produced, for example, by supplying alumina raw material powder into a high-temperature flame formed by the combustion reaction of a combustible gas and a combustion supporting gas, and melting and spheroidizing the powder at a temperature above its melting point.
  • the particles obtained by this type of molten flame method are called molten spherical particles.
  • the obtained molten spherical particles may be further subjected to classification and sieving processing as necessary.
  • For the alumina raw material powder multiple raw material powders with different particle sizes are used.
  • FIG. 1 shows a schematic diagram of an example of a thermal spraying apparatus used for producing molten spherical particles.
  • the thermal spraying device 100 in FIG. 1 is composed of a melting furnace 2 in which a burner 1 is installed, a cyclone 4 for classifying molten spherical particles generated by high-temperature exhaust gas from a flame by suction with a blower 9, and a bag filter 8 for collecting fine powder that cannot be captured by the cyclone 4.
  • the melting furnace 2 is configured as a vertical furnace body, but is not limited to this, and may be a so-called horizontal furnace or inclined furnace that is horizontal and blows out flames horizontally.
  • the hot exhaust gas is cooled by pipes 3 and 5 which are equipped with water-cooled jackets.
  • the blower 9 may be connected to a suction gas amount control valve and a gas exhaust port (not shown).
  • a collected powder removal device (not shown) may be connected to the lower portion of the melting furnace 2, the cyclone 4, and the bag filter 8.
  • the classification can be carried out using known equipment such as a settling chamber, a cyclone, a classifier having a rotor, etc. This classification operation may be incorporated into the transportation process of the molten spheroidized product, or may be carried out in a separate line after collecting the molten spheroidized product all at once.
  • the combustible gas for example, one or more of acetylene, propane, butane, etc. may be used, but propane, butane, or a mixture thereof, which have a relatively small calorific value, is preferred.
  • the combustion supporting gas for example, a gas containing oxygen is used. In general, it is most preferable to use pure oxygen of 99 mass% or more, as it is inexpensive.
  • an inert gas such as air or argon can be mixed with the combustion supporting gas.
  • Alumina powder having an average particle size of, for example, 3 to 70 ⁇ m may be used as the raw material powder, which is the alumina raw material powder.
  • the aluminum hydroxide powder may be supplied to the high-temperature flame in a dry manner or in a wet manner in which it is slurried with water or the like.
  • the spherical alumina powder of the present invention can be blended with a resin composition and used suitably as a resin molding material.
  • the resin composition contains, in addition to the spherical alumina powder of the present invention, a resin and known resin additives.
  • the spherical alumina powder may be used alone or may be mixed with other fillers.
  • the resin composition may contain 10 to 99% by mass of the spherical alumina powder, or 10 to 99% by mass of a mixed inorganic powder containing the spherical alumina powder and other fillers.
  • the content of the other fillers in the mixed inorganic powder may be, for example, 1 to 20% by mass or 3 to 15% by mass relative to 100% by mass of the spherical alumina powder.
  • the range "to" indicates that both the upper and lower limits are included, unless otherwise specified.
  • Examples of the other fillers include crystalline silica, fused silica, titania, silicon nitride, aluminum nitride, silicon carbide, talc, and calcium carbonate.
  • the average particle size of the other fillers is, for example, about 5 to 100 ⁇ m, and there are no particular restrictions on the particle size composition and shape.
  • Examples of the above resins include epoxy resins, silicone resins, phenolic resins, melamine resins, urea resins, unsaturated polyesters, fluororesins, polyamides such as polyimide, polyamideimide, and polyetherimide, polyesters such as polybutylene terephthalate and polyethylene terephthalate, polyphenylene sulfide, wholly aromatic polyesters, polysulfones, liquid crystal polymers, polyethersulfones, polycarbonates, maleimide-modified resins, ABS resins, AAS (acrylonitrile-acrylic rubber-styrene) resins, and AES (acrylonitrile-ethylene-propylene-diene rubber-styrene) resins. These may be used alone or in combination of two or more.
  • the resin composition can be produced, for example, by blending the raw material components in a prescribed ratio using a blender or Henschel mixer, kneading the mixture using a heated roll, kneader, single-screw or twin-screw extruder, etc., cooling the mixture, and then pulverizing it.
  • the thermal spraying device 100 shown in FIG. 1 includes a melting furnace 2, a burner 1 installed in the upper part of the melting furnace 2, and a collection system line installed directly connected to the lower part of the melting furnace 2 and consisting of a cyclone 4 and a bag filter 8.
  • Burner 1 has a double-tube structure capable of forming an inner flame and an outer flame, and is installed at the top of melting furnace 2, to which a combustible gas supply pipe 11, a combustion supporting gas supply pipe 12, and a raw material supply pipe 13 are each connected.
  • raw material powder is fed into a high-temperature flame through a raw material supply pipe 13 and melted to form molten spherical particles.
  • the molten spherical particles that have passed through the melting furnace 2 are sucked in by a blower 9 together with the combustion exhaust gas, moved by the air through pipes 3 and 5, and classified and collected by a cyclone 4 or a bag filter 8.
  • Example 1 Using the above-mentioned thermal spraying device 100, LPG was supplied as a combustible gas from the combustible gas supply pipe 11, and atmospheric air was supplied as a combustion supporting gas from the combustion supporting gas supply pipe 12. A high-temperature flame was formed in the burner 1 by combustion of the LPG and oxygen. Secondary air is supplied to the cyclone 4 by a rotary valve (not shown) installed in the pipe 3. Air in the atmosphere is used as the secondary air. The degree of opening and closing of the lower valve in the cyclone 4 (lower opening degree) is set to 100%. As the raw material powder, a plurality of alumina powders having an average particle size (D 50 ) with a maximum value in the range of 2 to 45 ⁇ m were used.
  • D 50 average particle size
  • the supply rates were 15 Nm 3 /hr for the carrier gas of the raw material heated to 500° C., 5 Nm 3 /hr for the burner combustible gas, and 10 Nm 3 /hr for the combustion supporting gas.
  • the molten spherical particles captured by the bag filter 8 were recovered as spherical alumina powder.
  • Examples 2 to 4 The spherical alumina powder was collected in the same manner as in Example 1 above, except that the lower opening degree during the classification treatment in the production of the spherical alumina powder was changed to 20%, 25%, and 35%, respectively.
  • Comparative Example 1 To the spherical alumina powder recovered in the same manner as in Example 1, spherical alumina fine powder (DAW-01, manufactured by Denka Company, Ltd., average particle diameter D50 : 2 ⁇ m) was added to adjust the particle size distribution in Table 1, and then the mixture was fired in an electric furnace at 1200° C. for 30 minutes to obtain the spherical alumina powder of Comparative Example 1.
  • DWA-01 spherical alumina fine powder manufactured by Denka Company, Ltd., average particle diameter D50 : 2 ⁇ m
  • X-ray diffraction measurement The X-ray diffraction pattern of the obtained spherical alumina powder was measured using an X-ray diffractometer D8 ADVANCE (manufactured by Bruker Corp.) with Cu-K ⁇ radiation under the following measurement conditions.
  • the ⁇ -phase peak intensity ratio (%) was calculated using the formula 1: [ I ⁇ /( I ⁇ + I ⁇ + I ⁇ )] ⁇ 100
  • the ⁇ -phase peak intensity ratio (%) was calculated using the formula 2: [ I ⁇ /( I ⁇ + I ⁇ + I ⁇ )] ⁇ 100
  • the ⁇ -phase peak intensity ratio (%) was calculated using the formula 3: [ I ⁇ /( I ⁇ + I ⁇ + I ⁇ )] ⁇ 100.
  • Crystallite size was calculated from the obtained powder X-ray diffraction pattern by quantitative analysis using Rietveld analysis with powder X-ray diffraction pattern analysis software TOPAS attached to the powder X-ray diffractometer.
  • ⁇ Loose bulk density, hard bulk density> The loose bulk density and the packed bulk density of the obtained spherical alumina powder were measured at room temperature of 25° C. and humidity of 55% using a powder tester (PT-E type, manufactured by Hosokawa Micron Corporation). The specific steps are as follows: The spherical alumina powder sample was allowed to fall from a height of 25 cm at a rate of 5 to 10 g per minute into a 100 cm3 measuring cup. The drop was continued until the powder overflowed from the cup, and a heaping cup was prepared.
  • the overflowing powder was leveled off without tapping, and then the mass (g) of the spherical alumina powder filled in the cup was measured to calculate the loose bulk density (g/cm 3 ).
  • the heaped cup was tapped up and down 180 times (stroke length 2 cm, 1 second/time), and the overflowed powder was leveled off.
  • the mass (g) of the spherical alumina powder filled in the cup was then measured, and the compacted bulk density (g/ cm3 ) was calculated.
  • the loose bulk density obtained by the above procedure is A and the hardened bulk density is P
  • the degree of compression (%) was calculated based on the formula: ((P-A)/P) x 100.
  • the volume frequency particle size distribution of the obtained spherical alumina powder was determined by a wet laser diffraction scattering method using a particle size distribution measuring device (LS-13230, manufactured by Beckman Coulter, Inc.). Water was used as the solvent, and as a pretreatment, the powder was dispersed for 1 minute using a homogenizer at an output of 200 W. The PIDS (Polarization Intensity Differential Scattering) concentration was adjusted to 45 to 55%, and the measurement was performed. Based on the obtained volume frequency particle size distribution, the particle diameter D X at which the cumulative value becomes X% was calculated.
  • ⁇ Burring prevention> A mixture of 90.1 parts by mass of the obtained spherical alumina powder, 4.8 parts by mass of biphenylene aralkyl phenol type epoxy resin (manufactured by Nippon Kayaku Co., Ltd., product name: NC-3000, epoxy equivalent 275, softening point 56° C.), 3.7 parts by mass of phenol resin (phenol aralkyl resin, manufactured by Meiwa Kasei Co., Ltd. MEHC-7800S), 0.19 parts by mass of triphenylphosphine (manufactured by Hokko Chemical Industry Co., Ltd.: TPP), and N-phenyl-3-aminopropyltrimethylamine was used.
  • biphenylene aralkyl phenol type epoxy resin manufactured by Nippon Kayaku Co., Ltd., product name: NC-3000, epoxy equivalent 275, softening point 56° C.
  • phenol resin phenol aralkyl resin, manufactured by Meiwa Kasei Co.
  • toxosilane manufactured by Shin-Etsu Chemical Co., Ltd.: KBM-573
  • a Henschel mixer manufactured by Nippon Coke and Engineering Co., Ltd., "FM-20C/I”
  • screw diameter D 25 mm,
  • the obtained resin composition was molded using a burr measurement mold having slits of 2 ⁇ m, 5 ⁇ m, 10 ⁇ m, and 30 ⁇ m at a molding temperature of 175° C. and a molding pressure of 7.4 MPa.
  • the amount of resin that flowed into the slits was measured with a vernier caliper, and the values measured for each slit were averaged to determine the burr length ( ⁇ m).
  • the burr length was 2 mm or less, it was evaluated as being able to suppress the generation of burrs during molding (good), and when it exceeded 2 mm, it was evaluated as being likely to generate burrs during molding (bad).
  • the resin composition obtained above was used in a spiral flow mold in accordance with EMMI-1-66 (Epoxy Molding Material Institute; Society of Plastics Industry).
  • the mold temperature was 175° C.
  • the molding pressure was 7.4 MPa
  • the pressure retention time was 90 seconds.
  • a spiral flow of 150 cm or more was evaluated as good, and a spiral flow of less than 150 cm was evaluated as poor.
  • the resin composition obtained above was poured into a mold having a disk-shaped hole with a diameter of 28 mm and a thickness of 3 mm, and molded at 150 ° C for 20 minutes after degassing.
  • the thermal conductivity (W / m ⁇ K) of the obtained molded body and the obtained resin composition was measured by a steady method in accordance with ASTM D5470 using a thermal conductivity measuring device (Hitachi Technology & Services Co., Ltd. resin material thermal resistance measuring device "TRM-046RHHT" (trade name)).
  • the resin composition was processed to a width of 10 mm x 10 mm, and the measurement was performed while applying a load of 2 N.
  • Thermal conductivity (W/m ⁇ K) thickness of molded body (m)/ ⁇ thermal resistance (° C./W) ⁇ heat transfer area (m 2 ) ⁇
  • the spherical alumina powders of Examples 1 to 4 were able to suppress the generation of burrs during molding of the resin composition, and also showed results that improved the fluidity of the resin composition during molding. In addition, the spherical alumina powders of Examples 1 to 4 showed results that improved the thermal conductivity of the resin molding material.

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PCT/JP2023/045121 2022-12-16 2023-12-15 球状アルミナ粉末 Ceased WO2024128318A1 (ja)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008120673A (ja) * 2006-10-19 2008-05-29 Showa Denko Kk 球状無機酸化物粉体とその製造方法およびその用途
JP2011102215A (ja) * 2009-11-11 2011-05-26 Denki Kagaku Kogyo Kk 球状アルミナ粉末、その製造方法及び用途。
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