WO2023135857A1 - 熱伝導性組成物及びこれを用いた熱伝導性シートとその製造方法 - Google Patents
熱伝導性組成物及びこれを用いた熱伝導性シートとその製造方法 Download PDFInfo
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- WO2023135857A1 WO2023135857A1 PCT/JP2022/033235 JP2022033235W WO2023135857A1 WO 2023135857 A1 WO2023135857 A1 WO 2023135857A1 JP 2022033235 W JP2022033235 W JP 2022033235W WO 2023135857 A1 WO2023135857 A1 WO 2023135857A1
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- thermally conductive
- conductive composition
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- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims abstract description 14
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 6
- 229920005573 silicon-containing polymer Polymers 0.000 claims description 6
- 230000001788 irregular Effects 0.000 claims description 4
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- 125000003342 alkenyl group Chemical group 0.000 description 20
- 125000004432 carbon atom Chemical group C* 0.000 description 18
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- 150000001875 compounds Chemical class 0.000 description 9
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- 239000002184 metal Substances 0.000 description 9
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- 125000001183 hydrocarbyl group Chemical group 0.000 description 7
- 125000000217 alkyl group Chemical group 0.000 description 6
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- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 6
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- 229910052710 silicon Inorganic materials 0.000 description 3
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- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
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- 125000003118 aryl group Chemical group 0.000 description 2
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- 239000003431 cross linking reagent Substances 0.000 description 2
- 125000004093 cyano group Chemical group *C#N 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 125000000596 cyclohexenyl group Chemical group C1(=CCCCC1)* 0.000 description 2
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 2
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- 238000010292 electrical insulation Methods 0.000 description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 2
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- QYXVDGZUXHFXTO-UHFFFAOYSA-L 3-oxobutanoate;platinum(2+) Chemical compound [Pt+2].CC(=O)CC([O-])=O.CC(=O)CC([O-])=O QYXVDGZUXHFXTO-UHFFFAOYSA-L 0.000 description 1
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- 238000000149 argon plasma sintering Methods 0.000 description 1
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- 229910052794 bromium Inorganic materials 0.000 description 1
- SXPLZNMUBFBFIA-UHFFFAOYSA-N butyl(trimethoxy)silane Chemical compound CCCC[Si](OC)(OC)OC SXPLZNMUBFBFIA-UHFFFAOYSA-N 0.000 description 1
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- SLYCYWCVSGPDFR-UHFFFAOYSA-N octadecyltrimethoxysilane Chemical compound CCCCCCCCCCCCCCCCCC[Si](OC)(OC)OC SLYCYWCVSGPDFR-UHFFFAOYSA-N 0.000 description 1
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- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
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- CLSUSRZJUQMOHH-UHFFFAOYSA-L platinum dichloride Chemical compound Cl[Pt]Cl CLSUSRZJUQMOHH-UHFFFAOYSA-L 0.000 description 1
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- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
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- 238000003860 storage Methods 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
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- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- OYGYKEULCAINCL-UHFFFAOYSA-N triethoxy(hexadecyl)silane Chemical compound CCCCCCCCCCCCCCCC[Si](OCC)(OCC)OCC OYGYKEULCAINCL-UHFFFAOYSA-N 0.000 description 1
- WUMSTCDLAYQDNO-UHFFFAOYSA-N triethoxy(hexyl)silane Chemical compound CCCCCC[Si](OCC)(OCC)OCC WUMSTCDLAYQDNO-UHFFFAOYSA-N 0.000 description 1
- FZMJEGJVKFTGMU-UHFFFAOYSA-N triethoxy(octadecyl)silane Chemical compound CCCCCCCCCCCCCCCCCC[Si](OCC)(OCC)OCC FZMJEGJVKFTGMU-UHFFFAOYSA-N 0.000 description 1
- NMEPHPOFYLLFTK-UHFFFAOYSA-N trimethoxy(octyl)silane Chemical compound CCCCCCCC[Si](OC)(OC)OC NMEPHPOFYLLFTK-UHFFFAOYSA-N 0.000 description 1
- HILHCDFHSDUYNX-UHFFFAOYSA-N trimethoxy(pentyl)silane Chemical compound CCCCC[Si](OC)(OC)OC HILHCDFHSDUYNX-UHFFFAOYSA-N 0.000 description 1
- HQYALQRYBUJWDH-UHFFFAOYSA-N trimethoxy(propyl)silane Chemical compound CCC[Si](OC)(OC)OC HQYALQRYBUJWDH-UHFFFAOYSA-N 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- 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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/28—Nitrogen-containing compounds
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
Definitions
- the present invention relates to a thermally conductive composition suitable for interposing between a heat-generating part such as an electric/electronic component and a radiator, a thermally conductive sheet using the same, and a method for producing the same.
- the present invention provides a thermally conductive composition having high thermal conductivity, low plasticity of the composition, and good moldability, a thermally conductive sheet using the same, and its production provide a way.
- the thermally conductive composition of the present invention is a thermally conductive composition containing a matrix resin made of a thermosetting resin, a curing catalyst, and thermally conductive particles. particles are (a) 600 to 1,500 parts by mass of spherical alumina having an average particle size of more than 100 ⁇ m; (b) 100 to 400 parts by mass of alumina having an average particle size of 1 ⁇ m or less; (c) Aluminum nitride having an average particle size of 0.8 to 150 ⁇ m is contained in an amount of 500 to 1500 parts by mass, and the plasticity of the thermally conductive composition after defoaming before curing is 80 or less.
- the thermally conductive sheet of the present invention is formed by forming the thermally conductive composition into a sheet.
- the thermally conductive composition is vacuum degassed, rolled, formed into a sheet, and then heat-cured to produce a thermally conductive sheet.
- the present invention can provide a thermally conductive composition with high thermal conductivity, low plasticity, and good moldability, and a thermally conductive sheet using the same.
- the plasticity after defoaming before curing of the thermally conductive composition is 80 or less
- the preferable thermal conductivity is 7.3 W/m ⁇ K or more.
- continuous sheet molding is possible because the composition has low plasticity and good moldability.
- FIG. 1 is a schematic cross-sectional view showing how to use a thermally conductive sheet in one embodiment of the present invention.
- 2A and 2B are schematic explanatory diagrams showing a method of measuring the thermal conductivity of a sample in one example of the present invention.
- FIG. 3 is an appearance photograph (magnification of 100 times) of irregularly crushed aluminum nitride used in one embodiment of the present invention.
- the present invention is a thermally conductive composition containing a matrix resin, a curing catalyst, and thermally conductive particles.
- the matrix resin is preferably a thermosetting resin such as silicone rubber, silicone gel, acrylic rubber, fluororubber, epoxy resin, phenol resin, unsaturated polyester resin, melamine resin, acrylic resin, silicone resin, and fluororesin.
- silicone is preferred, and examples thereof include elastomers, gels, putties, and greases. Any method such as peroxide, addition, condensation or the like may be used as the silicone curing system. Silicone is preferred because of its high heat resistance. Moreover, it is preferably an addition reaction type because it has no corrosiveness to the surroundings, little by-products are released to the outside of the system, and it can be reliably cured to deep portions.
- Thermally conductive particles are added as follows to 100 parts by mass of the matrix resin component.
- the spherical alumina preferably has an average particle size of more than 100 ⁇ m and 150 ⁇ m or less, more preferably 102 to 140 ⁇ m, still more preferably 104 to 130 ⁇ m.
- the alumina preferably has an average particle size of 0.05 to 1 ⁇ m, more preferably 0.1 to 0.9 ⁇ m, still more preferably 0.1 to 0.9 ⁇ m.
- the shape of the alumina may be spherical or crushed irregularly (hereinafter also referred to as “irregular”).
- Aluminum nitride having an average particle size of 0.8 to 150 ⁇ m is 500 to 1500 parts by mass, preferably 600 to 1400 parts by mass, more preferably 700 to 1400 parts by mass.
- the aluminum nitride preferably has an average particle size of 0.8 to 140 ⁇ m, more preferably 0.8 to 130 ⁇ m, and still more preferably 0.9 to 120 ⁇ m.
- the shape of the aluminum nitride is preferably an irregular crushed shape.
- the plasticity after vacuum defoaming before curing of the thermally conductive composition is 80 or less, preferably 1-80, more preferably 5-70. Thereby, the plasticity of the composition is low, and a thermally conductive composition having good moldability can be obtained.
- the plasticity is measured using a Wallace plastometer according to JIS K 6300-3, ISO 2007:1991, and the sample is placed between two metal plates at a measurement temperature of 25 ° C with a constant load (100 N) and a constant load.
- the thermal conductivity of the cured product of the thermally conductive composition is preferably 7.3 W/m ⁇ K or more, more preferably 7.3 to 20 W/m ⁇ K, and still more preferably 7.5 to 17 W/m ⁇ K. and particularly preferably 8 to 15 W/m ⁇ K. Due to this, the thermal conductivity is high and it is suitable as a TIM (Thermal Interface Material).
- the ASKER C hardness of the cured product of the thermally conductive composition is preferably 50 or less, more preferably 10-50, and even more preferably 15-45. As a result, followability to the heating element and radiator (heat sink) is improved.
- silane coupling agent is coated on the surface of the thermally conductive particles (surface treatment), making it easier to fill the matrix resin and preventing the curing catalyst from being adsorbed to the thermally conductive particles, thereby preventing curing inhibition. There is This is useful for storage stability.
- the silane coupling agent is R(CH 3 ) a Si(OR′) 4-a (R is an unsubstituted or substituted organic group having 1 to 20 carbon atoms, R′ is an alkyl group having 1 to 4 carbon atoms, a is There are silane compounds represented by 0 or 1) or partial hydrolysates thereof.
- R(CH 3 ) a Si(OR′) 4-a R is an unsubstituted or substituted organic group having 1 to 20 carbon atoms, R′ is an alkyl group having 1 to 4 carbon atoms, a is 0 or 1
- alkoxysilane compound hereinafter simply referred to as "silane”
- examples of the alkoxysilane compound include methyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, butyltrimethoxysilane, pentyltrimethoxysilane, hexyltrimethoxysilane, hexyltriethoxysilane.
- silane octyltrimethoxysilane, octyltriethoxysilane, decyltrimethoxysilane, decyltriethoxysilane, dodecyltrimethoxysilane, dodecyltriethoxysilane, hexadecyltrimethoxysilane, hexadecyltriethoxysilane, octadecyltrimethoxysilane, There are silane compounds such as octadecyltriethoxysilane.
- the silane compounds can be used singly or in combination of two or more.
- the shape of the aluminum nitride (c) is preferably an irregular crushed shape. Amorphous crushed aluminum nitride is readily available.
- FIG. 3 is an appearance photograph (magnification of 100 times) of irregularly crushed aluminum nitride used in one embodiment of the present invention.
- the thermally conductive composition of the present invention is a thermally conductive sheet formed into a sheet, it has high versatility and is suitable as a TIM.
- the thickness of the thermally conductive sheet is preferably in the range of 0.2-10 mm.
- the thermally conductive composition is vacuum defoamed, rolled, formed into a sheet, and then heat cured to form a thermally conductive sheet.
- Vacuum defoaming is performed by reducing the pressure of the thermally conductive composition (compound) to ⁇ 0.08 to ⁇ 0.1 Pa and leaving it for about 5 to 10 minutes to defoam.
- Rolling includes roll rolling, press working, and the like, but roll rolling is preferable because roll rolling allows continuous production.
- the dielectric breakdown voltage (JIS K6249) of the thermally conductive composition is preferably 7 to 16 kV/mm. As a result, a thermally conductive sheet with high electrical insulation can be obtained.
- the volume resistivity (JIS K6249) of the thermally conductive composition is preferably 10 10 to 10 14 ⁇ cm. As a result, a thermally conductive sheet with high electrical insulation can be obtained.
- a Matrix Resin Component includes the following (A1) and (A2).
- (A1) + (A2) is 100 parts by mass.
- (A1) Linear organopolysiloxane containing at least two silicon-bonded alkenyl groups per molecule (A2) Cross-linking component: containing at least two silicon-bonded hydrogen atoms per molecule
- (A1) and (A2) per 1 mol of silicon-bonded alkenyl groups in component A good is preferred.
- Thermally Conductive Particles are as follows per 100 parts by mass of the matrix resin.
- platinum-based metal catalyst an amount of 0.01 to 1000 ppm in mass units relative to the matrix resin component
- Other additives curing retarder, Colorant, etc.; optional amount, silane coupling agent
- the base polymer component is an organopolysiloxane containing two or more silicon-bonded alkenyl groups per molecule, and the organopolysiloxane containing two or more alkenyl groups is the main component ( base polymer component).
- This organopolysiloxane has, as alkenyl groups, two silicon-bonded alkenyl groups having 2 to 8 carbon atoms, particularly 2 to 6 carbon atoms, such as vinyl groups and allyl groups, in one molecule.
- a viscosity of 10 to 1,000,000 mPa ⁇ s, particularly 100 to 100,000 mPa ⁇ s at 25° C. is desirable from the standpoint of workability and curability.
- an organopolysiloxane containing two or more alkenyl groups bonded to silicon atoms at the ends of the molecular chain in one molecule represented by the following general formula (Chem. 1) is used.
- the side chains are linear organopolysiloxanes blocked with alkyl groups.
- a viscosity of 10 to 1,000,000 mPa ⁇ s at 25° C. is desirable from the standpoint of workability and curability.
- This linear organopolysiloxane may contain a small amount of branched structures (trifunctional siloxane units) in the molecular chain.
- R 1 is the same or different unsubstituted or substituted monovalent hydrocarbon group free of aliphatic unsaturated bonds
- R 2 is an alkenyl group
- k is 0 or a positive integer.
- the unsubstituted or substituted monovalent hydrocarbon group having no aliphatic unsaturated bond for R 1 preferably has 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms.
- the alkenyl group for R 2 preferably has 2 to 6 carbon atoms, particularly preferably 2 to 3 carbon atoms, specifically vinyl, allyl, propenyl, isopropenyl, butenyl, isobutenyl, and hexenyl. , cyclohexenyl group and the like, preferably vinyl group.
- k is generally 0 or a positive integer that satisfies 0 ⁇ k ⁇ 10000, preferably 5 ⁇ k ⁇ 2000, more preferably an integer that satisfies 10 ⁇ k ⁇ 1200 is.
- Component A1 organopolysiloxane has 3 or more, usually 3 to 30, silicon-bonded alkenyl groups having 2 to 8 carbon atoms, particularly 2 to 6 carbon atoms, such as vinyl groups and allyl groups, in one molecule.
- an organopolysiloxane having about 3 to 20 may be used together.
- the molecular structure may be linear, cyclic, branched or three-dimensional network.
- a straight chain having a main chain consisting of repeating diorganosiloxane units and having a viscosity at 25° C. of 10 to 1,000,000 mPa ⁇ s, particularly 100 to 100,000 mPa ⁇ s, having both ends of the molecular chain blocked with triorganosiloxy groups. is an organopolysiloxane.
- the alkenyl group may be attached to any part of the molecule.
- it may contain those bonded to silicon atoms at the ends of the molecular chains or non-terminals of the molecular chains (middle of the molecular chains).
- having 1 to 3 alkenyl groups on each of the silicon atoms at both ends of the molecular chain represented by the following general formula (Chemical 2) (provided that the alkenyl groups bonded to the silicon atoms at the ends of the molecular chain are When the total number of both ends is less than 3, a linear chain having at least one non-terminal (alkenyl group bonded to a silicon atom in the middle of the molecular chain) as a substituent in, for example, a diorganosiloxane unit
- the organopolysiloxane has a viscosity of 10 to 1,000,000 mPa ⁇ s at 25° C. as described above.
- This linear organopolysiloxane has a viscos
- R 3 are the same or different unsubstituted or substituted monovalent hydrocarbon groups, at least one of which is an alkenyl group.
- R 4 is the same or different unsubstituted or substituted monovalent hydrocarbon group having no aliphatic unsaturated bond,
- R 5 is an alkenyl group, and 1 and m are 0 or positive integers.
- the monovalent hydrocarbon group for R 3 preferably has 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms, and specifically includes methyl, ethyl, propyl, isopropyl, butyl, Alkyl groups such as isobutyl group, tert-butyl group, pentyl group, neopentyl group, hexyl group, cyclohexyl group, octyl group, nonyl group, decyl group, phenyl group, tolyl group, xylyl group, aryl group such as naphthyl group, benzyl aralkyl groups such as phenylethyl group and phenylpropyl group; alkenyl groups such as vinyl group, allyl group, propenyl group, isopropenyl group, butenyl group, hexenyl group, cyclohexenyl group and octenyl group; Halogen
- the monovalent hydrocarbon group for R 4 those having 1 to 10 carbon atoms, particularly 1 to 6 carbon atoms are preferable, and the same specific examples as those for R 1 above can be exemplified, but alkenyl groups are not included.
- the alkenyl group for R 5 for example, those having 2 to 6 carbon atoms, particularly preferably 2 to 3 carbon atoms, are specifically exemplified by the same groups as those for R 2 in the above formula (Chemical Formula 1), preferably a vinyl group. is.
- l and m are generally 0 or positive integers satisfying 0 ⁇ l+m ⁇ 10000, preferably 5 ⁇ l+m ⁇ 2000, more preferably 10 ⁇ l+m ⁇ 1200, and 0 ⁇ l/(l+m ) ⁇ 0.2, preferably an integer satisfying 0.0011 ⁇ l/(l+m) ⁇ 0.1.
- A2 component The organohydrogenpolysiloxane of the A2 component of the present invention acts as a cross-linking agent, and the SiH groups in this component and the alkenyl groups in the A component undergo an addition reaction (hydrosilylation) to form a cured product. It is.
- Such organohydrogenpolysiloxane may be any one having two or more silicon-bonded hydrogen atoms (i.e., SiH groups) in one molecule, and the molecular structure of this organohydrogenpolysiloxane is , Linear, cyclic, branched, or three-dimensional network structure, but the number of silicon atoms in one molecule (that is, the degree of polymerization) is 2 to 1000, especially 2 to 300. can be used.
- the position of the silicon atom to which the hydrogen atom is bonded is not particularly limited, and may be either the terminal of the molecular chain or the non-terminal of the molecular chain (in the middle of the molecular chain).
- examples of the organic group bonded to a silicon atom other than a hydrogen atom include unsubstituted or substituted monovalent hydrocarbon groups having no aliphatic unsaturated bond, similar to R 1 in the general formula (1). .
- organohydrogenpolysiloxane of component A2 those having the following structures can be exemplified.
- R6 is the same or different alkyl group, phenyl group, epoxy group, acryloyl group, methacryloyl group, alkoxy group, hydrogen atom, and at least two of them are hydrogen atoms.
- L is an integer from 0 to 1,000, especially an integer from 0 to 300, and M is an integer from 1 to 200.
- Catalyst component (C component) A catalyst used for hydrosilylation reaction can be used as the catalyst component of the C component.
- a catalyst used for hydrosilylation reaction can be used as the catalyst component of the C component.
- platinum black platinum black, platinum chloride, chloroplatinic acid, reaction products of chloroplatinic acid and monohydric alcohols, complexes of chloroplatinic acid with olefins or vinylsiloxanes
- platinum-based catalysts such as platinum bisacetoacetate, palladium-based platinum group metal catalysts such as catalysts and rhodium-based catalysts;
- Thermally conductive particles (B component) The total amount of the thermally conductive particles of component B is preferably 1,200 to 3,400 parts by mass per 100 parts by mass of component A, which is a matrix component. Thereby, the thermal conductivity can be kept high.
- thermally conductive inorganic particles with different average particle sizes are used in combination for the thermally conductive particles.
- thermally conductive inorganic particles having a small particle size are embedded between the large particles, allowing close-packing to be achieved and increasing the thermal conductivity.
- composition of the present invention may contain ingredients other than those described above, if necessary.
- a heat-resistant improver such as red iron oxide, titanium oxide, or cerium oxide
- a flame retardant aid such as a flame retardant aid, a curing retarder, or the like
- Organic or inorganic pigments may be added for the purpose of coloring and toning.
- the silane coupling agent described above may be added.
- FIG. 1 is a schematic cross-sectional view of a heat dissipation structure 10 incorporating a thermally conductive sheet according to an embodiment of the present invention.
- the thermally conductive sheet 11 b dissipates heat generated by the electronic component 13 such as a semiconductor element, is fixed to the main surface 12 a of the heat spreader 12 facing the electronic component 13 , and is positioned between the electronic component 13 and the heat spreader 2 . sandwiched. Also, the heat conductive sheet 11 a is sandwiched between the heat spreader 12 and the heat sink 15 .
- the heat conductive sheets 11 a and 11 b constitute a heat radiating member that radiates heat from the electronic component 13 together with the heat spreader 2 .
- the heat spreader 12 is formed in, for example, a rectangular plate shape, and has a principal surface 12a facing the electronic component 13 and side walls 12b erected along the outer periphery of the principal surface 12a.
- the heat spreader 2 is provided with a heat conductive sheet 11b on the main surface 12a surrounded by the side walls 12b, and is provided with a heat sink 15 on the other surface 12c opposite to the main surface 12a via the heat conductive sheet 11a.
- the electronic component 13 is, for example, a semiconductor element such as BGA, and is mounted on the wiring board 14 .
- thermal conductivity of the thermally conductive silicone rubber sheet was measured using a hot disk (according to ISO/CD 22007-2). As shown in FIG. 2A, this thermal conductivity measuring device 1 sandwiches a polyimide film sensor 2 between two samples 3a and 3b, applies a constant electric power to the sensor 2, heats the sensor 2 at a constant temperature, and the temperature rise value of the sensor 2 is Analyze thermal properties.
- the sensor 2 has a tip 4 with a diameter of 7 mm, and as shown in FIG. 2B, has a double spiral structure of electrodes, and an applied current electrode 5 and a resistance value electrode (temperature measurement electrode) 6 are arranged at the bottom. It is Thermal conductivity is calculated by the following formula (Equation 1).
- the pre-vacuum plasticity is the plasticity of the compound as it is made.
- the plasticity after defoaming is the plasticity after defoaming for 5 minutes under a reduced pressure of -0.1 Pa after making a compound. Since the compound is formed into a sheet after defoaming, the post-defoaming plasticity is important.
- Examples 1 to 10, Comparative Examples 1 to 4 1.
- Material component (1) Polyorganosiloxane (component A) A two-part room temperature vulcanizing silicone polymer (silicone component) containing a commercially available polyorganosiloxane was used. One liquid (A liquid) contains a base polymer component (A1 component of A component) and a platinum group metal catalyst, and the other liquid (B liquid) contains a base polymer component (A component component A1 of component A) and organohydrogenpolysiloxane as a cross-linking agent component (component A2 of component A).
- Second Thermally conductive particles (B component) The thermally conductive particles described in Table 1 were used.
- the average particle diameter is D50 (median diameter) of cumulative particle size distribution based on volume in particle size distribution measurement by laser diffraction light scattering method.
- this measuring instrument for example, there is a laser diffraction/scattering particle distribution analyzer LA-950S2 manufactured by Horiba, Ltd.
- the numerical value before ⁇ m in the table is the average particle size of each particle.
- AlN in the table is an abbreviation for aluminum nitride.
- Platinum group metal catalyst (component C) A platinum-vinyldisiloxane complex was used as an additional platinum group metal catalyst.
- the two-liquid room temperature curing silicone polymer contains a platinum group metal catalyst.
- 2 parts by mass (2 g) of an additional platinum group metal catalyst is added to 100 parts by mass (100 g) of the silicone component so that the polyorganosiloxane is sufficiently primary cured. bottom.
- Sheet molding processing The compound is sandwiched between release-treated polyethylene terephthalate (PET) films, roll-molded into a sheet with a thickness of 2.0 mm with a constant speed roll, and heat-cured at 100 ° C. for 15 minutes to improve thermal conductivity. A silicone rubber sheet was molded. Tables 1 and 2 show the above conditions and results.
- PET polyethylene terephthalate
- the thermally conductive particles are: (a) 600 to 1,500 parts by mass of spherical alumina having an average particle size of more than 100 ⁇ m; (b) 100 to 400 parts by mass of alumina having an average particle size of 1 ⁇ m or less; It was confirmed that the amount of (c) aluminum nitride having an average particle size of 0.8 to 150 ⁇ m was 500 to 1500 parts by mass, so that the thermal conductivity was high and the plasticity of the composition after defoaming was low.
- Comparative Example 1 does not contain the component (a)
- Comparative Example 2 contains the component (a) but in a small amount
- Comparative Example 3 contains the component (b) in a small amount
- Comparative Example 4 contains the component (a) in a small amount. Since there was no component (a) and there was little component (c), the plasticity after defoaming was unfavorable.
- thermally conductive composition and thermally conductive sheet of the present invention are suitable for interposing between a heat-generating part such as an electric/electronic component and a radiator.
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Abstract
Description
本発明は前記従来の問題を解決するため、熱伝導率が高く、かつ組成物の可塑度は低く、成形加工性が良好な熱伝導性組成物及びこれを用いた熱伝導性シートとその製造方法を提供する。
(a)平均粒子径が100μmを超える球状アルミナが600~1500質量部、
(b)平均粒子径1μm以下のアルミナが100~400質量部、
(c)平均粒子径0.8~150μm窒化アルミニウムが500~1500質量部
を含み、前記熱伝導性組成物の硬化前の脱泡後の可塑度が80以下である。
(a)平均粒子径が100μmを超える球状アルミナが600~1500質量部であり、好ましくは600~1400質量部である。前記球状アルミナは、平均粒子径が100μmを超え150μm以下が好ましく、より好ましくは平均粒子径102~140μmであり、さらに好ましくは104~130μmである。
(b)平均粒子径1μm以下のアルミナが100~400質量部であり、好ましくは150~350質量部である。前記アルミナは、平均粒子径が0.05~1μmが好ましく、より好ましくは平均粒子径0.1~0.9μmであり、さらに好ましくは0.1~0.9μmである。前記アルミナの形状は、球状でもよいし不定形破砕状(以下「不定形」ともいう)でもよい。
(c)平均粒子径0.8~150μm窒化アルミニウムが500~1500質量部であり、好ましくは600~1400質量部であり、より好ましくは700~1400質量部である。前記窒化アルミニウムは、平均粒子径が0.8~140μm以下が好ましく、より好ましくは平均粒子径0.8~130μmであり、さらに好ましくは0.9~120μmである。前記窒化アルミニウムの形状は不定形破砕状が好ましい。
A マトリックス樹脂成分
マトリックス樹脂成分は、下記(A1)(A2)を含む。(A1)+(A2)で100質量部とする。
(A1)1分子中に少なくとも2個のケイ素原子に結合したアルケニル基を含有する直鎖状オルガノポリシロキサン
(A2)架橋成分:1分子中に少なくとも2個のケイ素原子に結合した水素原子を含有するオルガノハイドロジェンポリシロキサンが、前記A成分中のケイ素原子結合アルケニル基1モルに対して、1モル未満の量
前記(A1)(A2)成分以外に反応基を持たないオルガノポリシロキサンを含んでもよい。
B 熱伝導性粒子
熱伝導性粒子はマトリックス樹脂100質量部に対し、次のとおりとする。
(a)平均粒子径が100μmを超える球状アルミナが600~1500質量部、
(b)平均粒子径1μm以下のアルミナが100~400質量部、
(c)平均粒子径0.8~150μm窒化アルミニウムが500~1500質量部
C 白金系金属触媒:マトリックス樹脂成分に対して質量単位で0.01~1000ppmの量
D その他添加剤:硬化遅延剤、着色剤等;任意量、シランカップリング剤
(1)ベースポリマー成分(A1成分)
ベースポリマー成分は、一分子中にケイ素原子に結合したアルケニル基を2個以上含有するオルガノポリシロキサンであり、アルケニル基を2個以上含有するオルガノポリシロキサンは本発明のシリコーンゴム組成物における主剤(ベースポリマー成分)である。このオルガノポリシロキサンは、アルケニル基として、ビニル基、アリル基等の炭素原子数2~8、特に2~6の、ケイ素原子に結合したアルケニル基を一分子中に2個有する。粘度は25℃で10~1000000mPa・s、特に100~100000mPa・sであることが作業性、硬化性などから望ましい。
具体的には、下記一般式(化1)で表される1分子中に2個以上かつ分子鎖末端のケイ素原子に結合したアルケニル基を含有するオルガノポリシロキサンを使用する。側鎖はアルキル基で封鎖された直鎖状オルガノポリシロキサンである。25℃における粘度は10~1000000mPa・sのものが作業性、硬化性などから望ましい。なお、この直鎖状オルガノポリシロキサンは少量の分岐状構造(三官能性シロキサン単位)を分子鎖中に含有するものであってもよい。
また、R4の一価炭化水素基としても、炭素原子数1~10、特に1~6のものが好ましく、上記R1の具体例と同様のものが例示できるが、但しアルケニル基は含まない。R5のアルケニル基としては、例えば炭素数2~6、特に炭素数2~3のものが好ましく、具体的には前記式(化1)のR2と同じものが例示され、好ましくはビニル基である。l,mは、一般的には0<l+m≦10000を満足する0又は正の整数であり、好ましくは5≦l+m≦2000、より好ましくは10≦l+m≦1200で、かつ0<l/(l+m)≦0.2、好ましくは、0.0011≦l/(l+m)≦0.1を満足する整数である。
本発明のA2成分のオルガノハイドロジェンポリシロキサンは架橋剤として作用するものであり、この成分中のSiH基とA成分中のアルケニル基とが付加反応(ヒドロシリル化)することにより硬化物を形成するものである。かかるオルガノハイドロジェンポリシロキサンは、一分子中にケイ素原子に結合した水素原子(即ち、SiH基)を2個以上有するものであればいずれのものでもよく、このオルガノハイドロジェンポリシロキサンの分子構造は、直鎖状、環状、分岐状、三次元網状構造のいずれであってもよいが、一分子中のケイ素原子の数(即ち、重合度)は2~1000、特に2~300程度のものを使用することができる。
C成分の触媒成分はヒドロシリル化反応に用いられる触媒を用いることができる。例えば白金黒、塩化第2白金、塩化白金酸、塩化白金酸と一価アルコールとの反応物、塩化白金酸とオレフィン類やビニルシロキサンとの錯体、白金ビスアセトアセテート等の白金系触媒、パラジウム系触媒、ロジウム系触媒などの白金族金属触媒が挙げられる。
B成分の熱伝導性粒子は合計量で、マトリックス成分であるA成分100質量部に対して1,200~3,400質量部添加するのが好ましい。これにより熱伝導率を高く保つことができる。
本発明の組成物には、必要に応じて前記以外の成分を配合することができる。例えばベンガラ、酸化チタン、酸化セリウムなどの耐熱向上剤、難燃助剤、硬化遅延剤などを添加してもよい。着色、調色の目的で有機或いは無機顔料を添加しても良い。前記のシランカップリング剤を添加してもよい。
熱伝導性シリコーンゴムシートの熱伝導率は、ホットディスク(ISO/CD 22007-2準拠)により測定した。この熱伝導率測定装置1は図2Aに示すように、ポリイミドフィルム製センサ2を2個の試料3a,3bで挟み、センサ2に定電力をかけ、一定発熱させてセンサ2の温度上昇値から熱特性を解析する。センサ2は先端4が直径7mmであり、図2Bに示すように、電極の2重スパイラル構造となっており、下部に印加電流用電極5と抵抗値用電極(温度測定用電極)6が配置されている。熱伝導率は以下の式(数1)で算出する。
熱伝導性シリコーンゴムシートの硬さは、ASKER C(ASTM D2240:2021)に従い測定した。参考のため、SHORE 00(JIS K 7312:1996)硬さも測定した。
<可塑度>
可塑度は、JIS K 6300-3:2019,ISO 2007:1991に従い、ウォーレス可塑度計(Wallace plastometer)を使用し、測定温度23℃において、2枚の金属プレート間に試料を一定荷重(100N),一定時間(15秒)で圧縮した後の厚さ(t)を圧縮前の厚さ(t0)で割った値を可塑度(P0=t/t0×100)で求めた。P0が大きいほど柔軟であることを示す。真空前可塑度は、コンパウンドを作成した状態の可塑度である。脱泡後可塑度はコンパウンドを作成した後、-0.1Paの減圧状態で5分間脱泡した後の可塑度である。コンパウンドは脱泡した後にシート成形することから、脱泡後可塑度は重要である。
1.材料成分
(1)ポリオルガノシロキサン(A成分)
市販のポリオルガノシロキサンを含む2液室温硬化シリコーンポリマー(シリコーン成分)を使用した。一方の液(A液)には、ベースポリマー成分(A成分のうちのA1成分)と白金族系金属触媒が含まれており、他方の液(B液)には、ベースポリマー成分(A成分のうちのA1成分)と架橋剤成分(A成分のうちのA2成分)であるオルガノハイドロジェンポリシロキサンが含まれる。
(2)熱伝導性粒子(B成分)
表1に記載の熱伝導性粒子を使用した。平均粒子径は、レーザー回折光散乱法による粒度分布測定において、体積基準による累積粒度分布のD50(メジアン径)である。この測定器としては、例えば堀場製作所社製のレーザー回折/散乱式粒子分布測定装置LA-950S2がある。表中のμmの前の数値は各粒子の平均粒子径である。また表中のAlNは窒化アルミニウムの略語である。
(3)白金族系金属触媒(C成分)
追加の白金族系金属触媒として、白金-ビニルジシロキサン錯体を使用した。尚、上記の通り2液室温硬化シリコーンポリマー(シリコーン成分)には白金族系金属触媒が含まれている。各実施例のシリコーン組成物の調製に際し、ポリオルガノシロキサンが十分に一次硬化するように、追加の白金族系金属触媒を、シリコーン成分100質量部(100g)に対して2質量部(2g)添加した。
各材料について前記表1に示す量を計量し、それらを混合装置に入れてコンパウンドとした。表1において、各材料の量を、シリコーン成分(2液室温硬化シリコーンポリマー)を100質量部(100g)とした場合の量(質量部)で記載している。このコンパウンドは-0.1Paの減圧状態で5分間脱泡した。
離型処理をしたポリエチレンテレフタレート(PET)フィルムで前記コンパウンドを挟み込み、等速ロールにて厚み2.0mmのシート状にロール圧延成形し、100℃、15分加熱硬化し、熱伝導性シリコーンゴムシートを成形した。以上の条件と結果を表1及び2に示す。
(a)平均粒子径が100μmを超える球状アルミナが600~1500質量部、
(b)平均粒子径1μm以下のアルミナが100~400質量部、
(c)平均粒子径0.8~150μm窒化アルミニウムが500~1500質量部
であることにより、熱伝導率が高く、かつ組成物の脱泡後の可塑度が低いことが確認できた。
これに対して比較例1は、(a)成分がなく、比較例2は(a)成分はあるが添加量が少なく、比較例3は(b)成分の添加量が少なく、比較例4は(a)成分がなく、かつ(c)成分が少ないため、いずれも脱泡後の可塑度は好ましくなかった。
2 センサ
3a,3b 試料
4 センサの先端
5 印加電流用電極
6 抵抗値用電極(温度測定用電極)
10 放熱構造体
11a,11b 熱伝導性シート
12 ヒートスプレッダ
13 電子部品
14 配線基板
15 ヒートシンク
Claims (9)
- 熱硬化性樹脂からなるマトリックス樹脂と硬化触媒と熱伝導性粒子を含む熱伝導性組成物であって、
前記マトリックス樹脂100質量部に対し、前記熱伝導性粒子は、
(a)平均粒子径が100μmを超える球状アルミナが600~1500質量部、
(b)平均粒子径1μm以下のアルミナが100~400質量部、
(c)平均粒子径0.8~150μm窒化アルミニウムが500~1500質量部
を含み、前記熱伝導性組成物の硬化前の脱泡後の可塑度が80以下であることを特徴とする熱伝導性組成物。 - 前記熱伝導性組成物の硬化前の脱泡後の可塑度が70以下である請求項1に記載の熱伝導性組成物。
- 前記熱伝導性組成物の硬化物の熱伝導率は7.3W/m・K以上である請求項1又は2に記載の熱伝導性組成物。
- 前記熱伝導性組成物の硬化物のASKER C硬さが50以下である請求項1~3のいずれか1項に記載の熱伝導性組成物。
- 前記マトリックス樹脂は、付加硬化型シリコーンポリマー、過酸化物硬化型シリコーンポリマー及び縮合型シリコーンポリマーから選ばれる少なくとも一つである請求項1~4のいずれか1項に記載の熱伝導性組成物。
- 前記マトリックス樹脂成分100質量部に対し、さらにシランカップリング剤を0.1~10質量部添加する請求項1~5のいずれか1項に記載の熱伝導性組成物。
- 前記(c)の窒化アルミニウムの形状は不定形破砕状である請求項1~5のいずれか1項に記載の熱伝導性組成物。
- 請求項1~7のいずれか1項に記載の熱伝導性組成物はシートに成形されていることを特徴とする熱伝導性シート。
- 前記熱伝導性シートの厚みは0.2~10mmの範囲である請求項8に記載の熱伝導性シート。
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WO2025052715A1 (ja) * | 2023-09-06 | 2025-03-13 | 富士高分子工業株式会社 | 熱伝導性組成物及びこれを用いた熱伝導性シートとその製造方法 |
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