TWI816686B - 導熱片 - Google Patents
導熱片 Download PDFInfo
- Publication number
- TWI816686B TWI816686B TW107125816A TW107125816A TWI816686B TW I816686 B TWI816686 B TW I816686B TW 107125816 A TW107125816 A TW 107125816A TW 107125816 A TW107125816 A TW 107125816A TW I816686 B TWI816686 B TW I816686B
- Authority
- TW
- Taiwan
- Prior art keywords
- thermally conductive
- conductive sheet
- resin
- filler
- conductive filler
- Prior art date
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- 239000002470 thermal conductor Substances 0.000 title description 4
- 239000011231 conductive filler Substances 0.000 claims abstract description 83
- 239000011347 resin Substances 0.000 claims description 87
- 229920005989 resin Polymers 0.000 claims description 87
- 239000010410 layer Substances 0.000 claims description 50
- 239000000945 filler Substances 0.000 claims description 44
- 229920001971 elastomer Polymers 0.000 claims description 21
- 239000002344 surface layer Substances 0.000 claims description 15
- 239000005060 rubber Substances 0.000 claims description 14
- 229920000459 Nitrile rubber Polymers 0.000 claims description 11
- 229920002857 polybutadiene Polymers 0.000 claims description 11
- -1 polysiloxane Polymers 0.000 claims description 9
- 239000000806 elastomer Substances 0.000 claims description 7
- 229920001195 polyisoprene Polymers 0.000 claims description 7
- 229920002943 EPDM rubber Polymers 0.000 claims description 6
- 229920001296 polysiloxane Polymers 0.000 claims description 6
- 230000009477 glass transition Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 description 40
- 238000010894 electron beam technology Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000011342 resin composition Substances 0.000 description 11
- 238000004898 kneading Methods 0.000 description 10
- 238000003475 lamination Methods 0.000 description 10
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 9
- 238000005259 measurement Methods 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 229910052582 BN Inorganic materials 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 238000004132 cross linking Methods 0.000 description 7
- 230000000704 physical effect Effects 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 6
- 230000001133 acceleration Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 229910021389 graphene Inorganic materials 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 230000005865 ionizing radiation Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229920000800 acrylic rubber Polymers 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229920000058 polyacrylate Polymers 0.000 description 3
- 229920000346 polystyrene-polyisoprene block-polystyrene Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- VSKJLJHPAFKHBX-UHFFFAOYSA-N 2-methylbuta-1,3-diene;styrene Chemical class CC(=C)C=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 VSKJLJHPAFKHBX-UHFFFAOYSA-N 0.000 description 2
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- FACXGONDLDSNOE-UHFFFAOYSA-N buta-1,3-diene;styrene Chemical class C=CC=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 FACXGONDLDSNOE-UHFFFAOYSA-N 0.000 description 2
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical class C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229920003052 natural elastomer Polymers 0.000 description 2
- 229920001194 natural rubber Polymers 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000004945 silicone rubber Substances 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 2
- ROGIWVXWXZRRMZ-UHFFFAOYSA-N 2-methylbuta-1,3-diene;styrene Chemical class CC(=C)C=C.C=CC1=CC=CC=C1 ROGIWVXWXZRRMZ-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 229910052580 B4C Inorganic materials 0.000 description 1
- XMWRBQBLMFGWIX-UHFFFAOYSA-N C60 fullerene Chemical compound C12=C3C(C4=C56)=C7C8=C5C5=C9C%10=C6C6=C4C1=C1C4=C6C6=C%10C%10=C9C9=C%11C5=C8C5=C8C7=C3C3=C7C2=C1C1=C2C4=C6C4=C%10C6=C9C9=C%11C5=C5C8=C3C3=C7C1=C1C2=C4C6=C2C9=C5C3=C12 XMWRBQBLMFGWIX-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910002601 GaN Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- CAVCGVPGBKGDTG-UHFFFAOYSA-N alumanylidynemethyl(alumanylidynemethylalumanylidenemethylidene)alumane Chemical compound [Al]#C[Al]=C=[Al]C#[Al] CAVCGVPGBKGDTG-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- GPBUGPUPKAGMDK-UHFFFAOYSA-N azanylidynemolybdenum Chemical compound [Mo]#N GPBUGPUPKAGMDK-UHFFFAOYSA-N 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- WMWXXXSCZVGQAR-UHFFFAOYSA-N dialuminum;oxygen(2-);hydrate Chemical class O.[O-2].[O-2].[O-2].[Al+3].[Al+3] WMWXXXSCZVGQAR-UHFFFAOYSA-N 0.000 description 1
- 229920003244 diene elastomer Polymers 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012765 fibrous filler Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 229910003472 fullerene Inorganic materials 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- IDBFBDSKYCUNPW-UHFFFAOYSA-N lithium nitride Chemical compound [Li]N([Li])[Li] IDBFBDSKYCUNPW-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910021392 nanocarbon Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 241000894007 species Species 0.000 description 1
- SKRWFPLZQAAQSU-UHFFFAOYSA-N stibanylidynetin;hydrate Chemical compound O.[Sn].[Sb] SKRWFPLZQAAQSU-UHFFFAOYSA-N 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
-
- 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
- H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B25/042—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of natural rubber or synthetic rubber
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- B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/12—Layered products comprising a layer of natural or synthetic rubber comprising natural rubber
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- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/16—Layered products comprising a layer of natural or synthetic rubber comprising polydienes homopolymers or poly-halodienes homopolymers
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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- B32B25/20—Layered products comprising a layer of natural or synthetic rubber comprising silicone rubber
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- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
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- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
- C08J3/245—Differential crosslinking of one polymer with one crosslinking type, e.g. surface crosslinking
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- 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
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- 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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
- C08J7/123—Treatment by wave energy or particle radiation
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
- C09K5/14—Solid materials, e.g. powdery or granular
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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Abstract
本發明之導熱片係含有導熱性填料者,其特徵在於:導熱率為7W/m.K以上,30%壓縮強度為1500kPa以下,拉伸強度為0.08MPa以上。根據本發明,可提供一種導熱性、柔軟性、及操作性優異之導熱片。
Description
本發明係關於一種含有導熱性填料之導熱片。
導熱片主要具有如下功能,即配置於如半導體組件之發熱體與鋁或銅等散熱體之間以使發熱體所產生之熱快速地移動至散熱體。近年來,由於半導體元件之高積體化或半導體組件中之配線之高密度化,故而半導體組件之每單位面積之發熱量變大,伴隨此,對於較以往之導熱片提昇了導熱率之可更快速地促進熱散逸之導熱片的需求不斷提高。
又,為了密接於具有各種形狀之半導體組件等發熱體,而期望形狀追隨性良好之柔軟之導熱片。
於專利文獻1中記載有與摻合有導熱性填充劑之高導熱性聚矽氧橡膠相關之發明,且揭示了可達成導熱率為8.0W/m.K左右之高導熱性。又,於專利文獻2中記載有與摻合有液狀聚矽氧及導熱性填料之油灰狀散熱片相關之發明,且揭示了可達成3W/m.K以上之高導熱性。
專利文獻1:日本特開2005-325212號公報
專利文獻2:日本特開2005-42096號公報
然而,專利文獻1中所記載之高導熱性聚矽氧橡膠儘管導熱性較高,但A型硬度計硬度為90左右即較硬,而於柔軟性之方面上存在改善之餘地。
又,專利文獻2中所記載之油灰狀散熱片被認為導熱性較高,又,柔軟性亦相對優異。然而,於自膜等被黏著體剝離時,難以剝離乾淨,例如於中途容易發生撕斷(斷裂)等不良情況,操作性並不良好。
本發明係鑒於上述以往之課題而完成者,其目的在於提供一種導熱性、柔軟性、及操作性優異之導熱片。
本發明人等為了達成上述目的而反覆進行了努力研究,結果發現,具有特定之導熱率、30%壓縮強度、及拉伸強度之導熱片會解決上述課題,從而完成了本發明。
即,本發明係關於下述[1]~[15]。
[1]一種導熱片,其含有導熱性填料,其特徵在於:導熱率為7W/m.K以上,30%壓縮強度為1500kPa以下,拉伸強度為0.08MPa以上。
[2]如上述[1]所述之導熱片,其進而含有樹脂。
[3]如上述[1]或[2]所述之導熱片,其中,上述導熱性填料為非球狀填料。
[4]如上述[1]至[3]中任一項所述之導熱片,其中,上述導熱性填料之縱橫比為10以上。
[5]如上述[1]至[4]中任一項所述之導熱片,其中,上述導熱性填料以其長軸相對於片材面為60°以上之角度配向。
[6]如上述[2]至[5]中任一項所述之導熱片,其中,上述樹脂於25℃之黏度 為10~2000Pa.s。
[7]如上述[2]至[6]中任一項所述之導熱片,其中,上述導熱性填料之含量相對於樹脂100質量份為180~700質量份。
[8]如上述[1]至[7]中任一項所述之導熱片,其中,上述導熱性填料之體積比率為35~75體積%。
[9]如上述[1]或[2]所述之導熱片,其中,上述導熱性填料為球狀填料。
[10]如上述[2]或[9]所述之導熱片,其中,上述樹脂之黏度為10Pa.s以下。
[11]如上述[2]、[9]或[10]中任一項所述之導熱片,其中,上述導熱性填料之含量相對於樹脂100質量份為1000~3000質量份。
[12]如上述[1]、[2]、[9]、[10]、或[11]中任一項所述之導熱片,其中,上述導熱性填料之體積比率為65~95體積%。
[13]如上述[1]至[12]中任一項所述之導熱片,其中,至少一表層部之凝膠分率大於內層部之凝膠分率。
[14]如上述[1]至[13]中任一項所述之導熱片,其中,上述導熱性填料之導熱率為12W/m.K以上。
[15]如上述[2]至[14]中任一項所述之導熱片,其中,上述樹脂之玻璃轉移溫度為25℃以下。
根據本發明,可提供一種導熱性、柔軟性、及操作性優異之導熱片。
1‧‧‧導熱片
2‧‧‧樹脂層
3‧‧‧發熱體
4‧‧‧散熱體
5‧‧‧片材面
6‧‧‧導熱性填料
7‧‧‧導熱性樹脂層
8‧‧‧樹脂
圖1係由積層體所構成之導熱片之示意性剖面圖。
圖2係由積層體所構成之導熱片之使用狀態下之示意性剖面圖。
[導熱片]
本發明之導熱片含有導熱性填料,其導熱率為7W/m.K以上,30%壓縮強度為1500kPa以下,拉伸強度為0.08MPa以上。
含有導熱性填料之導熱片通常為了提高導熱性而大量地含有導熱性填料,若如此則有柔軟性降低之傾向,但本發明之導熱片係兼顧有高導熱率與良好之柔軟性之導熱片。此外,本發明之導熱片具有一定值以上之拉伸強度,例如於自被黏著體剝離時不易斷裂等操作性亦優異。即,本發明之導熱片係導熱性、柔軟性、操作性之物性平衡性優異之導熱片。
本發明之導熱片係如上述般各種物性優異之導熱片。該良好之物性係藉由適當地調整構成導熱片之導熱性填料等各者之結構、組成等而達成。
(樹脂)
本發明之導熱片較佳為含有樹脂。作為構成導熱片之樹脂之種類,並無特別限制,就使柔軟性良好之觀點而言,較佳為橡膠、彈性體樹脂。
橡膠、彈性體樹脂之玻璃轉移溫度較佳為室溫以下(例如25℃以下)。使用此種橡膠、彈性體樹脂之導熱片係柔軟性優異。
作為橡膠、彈性體樹脂之種類,例如可列舉:丙烯腈丁二烯橡膠、液狀丙烯腈丁二烯橡膠、乙烯-丙烯-二烯橡膠、液狀乙烯-丙烯-二烯橡膠、乙烯-丙烯橡膠、液狀乙烯-丙烯橡膠、天然橡膠、液狀天然橡膠、聚異戊二烯橡膠、液狀聚異戊二烯橡膠、聚丁二烯橡膠、液狀聚丁二烯橡膠、氫化聚丁二烯橡膠、液狀氫化聚丁二烯橡膠、苯乙烯-丁二烯嵌段共聚物、液狀苯乙烯-丁二烯嵌段共聚物、氫化苯乙烯-丁二烯嵌段共聚物、液狀氫化苯乙烯-丁二烯嵌 段共聚物、氫化苯乙烯-丁二烯-苯乙烯嵌段共聚物、液狀氫化苯乙烯-丁二烯-苯乙烯嵌段共聚物、氫化苯乙烯-異戊二烯嵌段共聚物、液狀氫化苯乙烯-異戊二烯嵌段共聚物、氫化苯乙烯-異戊二烯-苯乙烯嵌段共聚物、液狀氫化苯乙烯-異戊二烯-苯乙烯嵌段共聚物、聚矽氧、液狀聚矽氧、丙烯酸橡膠、液體丙烯酸橡膠(再者,丙烯酸橡膠係指包含丙烯酸酯及/或甲基丙烯酸酯之單體之聚合物)等,該等之中,較佳為液狀之橡膠、彈性體樹脂,較佳為液狀丙烯腈丁二烯橡膠、液狀乙烯-丙烯-二烯橡膠、液狀聚異戊二烯橡膠、液狀聚丁二烯橡膠、液狀聚矽氧。又,並非上述液狀之橡膠、彈性體樹脂為了獲得柔軟性,較佳為與液狀之同系樹脂等混練而使用。
就提昇導熱片之柔軟性之觀點而言,樹脂較佳為液狀,樹脂於25℃之黏度較佳為2000Pa.s以下,更佳為1000Pa.s以下,進而較佳為200Pa.s以下,並且較佳為1Pa.s以上。又,於將2種以上之樹脂混合使用之情形時,較佳為混合後之黏度如上所述。
就使導熱片之導熱性、柔軟性、操作性良好之觀點而言,樹脂之黏度較佳為視下述導熱性填料之種類而適當調整。
(導熱性填料)
構成本發明之導熱片之導熱性填料係分散於導熱片中。更具體而言,係分散於上述樹脂中。導熱性填料之導熱率並無特別限定,較佳為12W/m.K以上,更佳為15~70W/m.K、進而較佳為25~70W/m.K。
作為導熱性填料之材質,例如可列舉碳化物、氮化物、氧化物、氫氧化物、金屬、碳系材料等。
作為碳化物,例如可列舉碳化矽、碳化硼、碳化鋁、碳化鈦、碳化鎢等。
作為氮化物,例如可列舉氮化矽、氮化硼、氮化硼奈米管、氮化鋁、氮化鎵、氮化鉻、氮化鎢、氮化鎂、氮化鉬、氮化鋰等。
作為氧化物,例如可列舉氧化鐵、氧化矽(二氧化矽)、氧化鋁(Alumina)(包括氧化鋁之水合物(軟水鋁石等))、氧化鎂、氧化鈦、氧化鈰、氧化鋯等。又,作為氧化物,可列舉鈦酸鋇等過渡金屬氧化物等、或進而摻雜有金屬離子之例如氧化銦錫、氧化銻錫等。
作為氫氧化物,例如可列舉氫氧化鋁、氫氧化鈣、氫氧化鎂等。
作為金屬,例如可列舉銅、金、鎳、錫、鐵、或其等之合金。
作為碳系材料,例如可列舉碳黑、石墨、金剛石、石墨烯、富勒烯、奈米碳管、奈米碳纖維、奈米角、螺旋碳纖維、奈米線圈等。
作為上述以外之導熱性填料,可列舉作為矽酸鹽礦物之滑石。
該等導熱性填料可單獨使用或併用2種以上。就導熱性之觀點而言,導熱性填料較佳為選自由氧化鋁、氧化鎂、氮化硼、氮化鋁、石墨烯、氮化硼奈米管、奈米碳管、及金剛石所組成之群中之至少1種。又,於導熱性填料為下述非球狀填料之情形時,較佳為氮化硼、石墨烯中之至少任一者,另一方面,於球狀填料之情形時,較佳為氧化鋁。於進而要求電氣絕緣性之用途中,更佳為氮化硼。
導熱性填料之形狀並無特別限定,可為球狀填料亦可為非球狀填料。此處,「球狀」係指長徑/短徑比以平均計為1.0~2.0、較佳為1.0~1.5之形狀,未必為真球。又,「非球狀」係指上述球狀以外之形狀。
導熱性填料之平均粒徑較佳為0.1~300μm,更佳為0.5~100μm,進而較佳為5~50μm。平均粒徑可藉由雷射繞射式粒度分佈測定裝置測定粒度分佈而求出。
導熱片中之導熱性填料之含量相對於樹脂100質量份,較佳為180~3000質量份,更佳為200~2500質量份。
導熱性填料之含量較佳為如下述般視填料之形狀而適當調整。
(其他添加劑)
對於本發明之導熱片,亦可視需要摻合抗氧化劑、熱穩定劑、著色劑、難燃劑、抗靜電劑、上述導熱性填料以外之填充材、分解溫度調整劑等導熱片通常所使用之添加劑。
(導熱片之物性)
就使片材之散熱性良好之觀點而言,導熱片之導熱率較佳為8W/m.K以上,更佳為10W/m.K以上。又,導熱片之導熱率通常為100W/m.K以下,較佳為20W/m.K以下。
就使片材之柔軟性良好之觀點而言,導熱片之30%壓縮強度較佳為1000kPa以下,更佳為800kPa以下,進而較佳為500kPa以下。又,導熱片之30%壓縮強度通常為50kPa以上,較佳為200kPa以上。
就使片材之操作性良好之觀點而言,導熱片之拉伸強度較佳為0.1MPa以上。又,就柔軟性之觀點而言,導熱片之拉伸強度較佳為1.5MPa以下。
導熱片只要視導熱性填料或樹脂之種類於需要交聯之情形時進行交聯即可。導熱片之交聯度係以凝膠分率表示。
就使柔軟性良好之觀點而言,導熱片整體之凝膠分率較佳為50%以下,更佳為40%以下,進而較佳為20%以下。
上述導熱率、30%壓縮強度、拉伸強度、及凝膠分率可藉由實施例所述之方法進行測定。
又,就使操作性更良好之觀點而言,可使至少一表層部之凝膠分率大於內層部之凝膠分率,亦可使兩表層部之凝膠分率均大於內層部之凝膠分率。凝膠分率係與樹脂之交聯程度相關,通常交聯之程度越大,凝膠分率變得越大。使表層部之凝膠分率大於內層部之方法並無特別限定,例如,於藉由下述電子束 照射進行之情形時,只要調整電子束之加速電壓及照射量即可。
再者,表層部係指自表面(片材面)直至相對於導熱片之厚度為25%為止之區域,內層部係指表層部以外之區域。
本發明之導熱片中所含有之導熱性填料可為球狀填料、非球狀填料中之任一者,根據填料之形狀,用以達成所需之片材物性的較佳之填料含量、樹脂之種類、導熱片之構造等不同。以下,分別進行說明。
[含有非球狀填料之導熱片(A)]
對本發明之導熱片為含有非球狀填料作為導熱性填料之導熱片(A)的情形進行說明。藉由使用非球狀填料,而與使用球狀填料之情形相比,導熱片之拉伸強度容易變高,因此操作性容易變得良好。又,由於容易以相對少量提昇導熱性,故而容易獲得兼顧有良好之柔軟性與高導熱性之導熱片。
作為非球狀填料,例如可列舉鱗片狀、薄片狀等板狀之填料、針狀填料、纖維狀填料、樹枝狀填料、不定形狀填料等。就使導熱片之導熱性良好之觀點而言,較佳為板狀填料,板狀填料之中,較佳為鱗片狀填料。
就提昇導熱性之觀點而言,導熱性填料之縱橫比較佳為10以上,更佳為15以上。
於導熱片(A)中,藉由使縱橫比較高之導熱性填料如下述般以較高之配向角度進行配向,能夠進一步提昇厚度方向之導熱性。
再者,縱橫比係指導熱性填料之最大長度相對於最小長度(與最大長度垂直之方向)之比(最大長度/最小長度),例如於形狀為板狀之情形時,係填料之最大長度相對於厚度之比(最大長度/厚度)。縱橫比可利用掃描式電子顯微鏡觀察充分數量(例如250個)之導熱性填料而以平均值之形式求出。
就提昇導熱率之觀點而言,導熱性填料之最小長度(於板狀填料之情形時相當於厚度)較佳為0.05~500μm,更佳為0.25~250μm。
於導熱片(A)含有樹脂之情形時,導熱片(A)中之導熱性填料之含量相對於樹脂100質量份,較佳為180~700質量份,更佳為200~600質量份,進而較佳為300~500質量份。若為180質量份以上,則導熱性變高,而變得容易達成本發明中所規定之導熱率。又,若為700質量份以下,則柔軟性容易變得良好。
導熱片(A)中之導熱性填料之體積比率較佳為35~75體積%,更佳為40~65體積%。該導熱性填料之體積比率係以導熱片總量基準計之值,能夠根據構成導熱片之各成分之質量算出。例如可藉由用各成分之質量除以各成分於23℃之密度而算出。
於導熱片(A)中,較佳為導熱性填料以其長軸相對於導熱片之表面即片材面為大於45°之角度配向,較佳為以更佳為50°以上、進而較佳為60°以上、進而較佳為70°以上、進而較佳為80°以上之角度配向。於導熱性填料進行此種配向之情形時,導熱片之厚度方向之導熱率提昇。再者,導熱性填料之長軸與上述導熱性填料之最大長度方向一致。
上述角度可藉由利用掃描式電子顯微鏡對導熱片之厚度方向之剖面進行觀察而測定。例如,首先製作導熱片之厚度方向之中央部分之薄膜切片。然後,利用掃描式電子顯微鏡(SEM)以倍率3000倍觀察該薄膜切片中之導熱性填料,測定所觀察到之填料之長軸與構成片材面之面所成之角度,藉此可求出上述角度。於本說明書中,45°、50°、60°、70°、80°以上之角度係指以上述方式測得之值之平均值為該等角度以上。例如,「以70°以上之角度配向」係70°為平均值,因此並不否定配向角度未達70°之導熱性填料之存在。再者,於所成角度超過90°之情形時,將其補角作為測定值。
於導熱片(A)中,樹脂於25℃之黏度較佳為10~2000Pa.s,更佳為20~1000Pa.s,進而較佳為30~200Pa.s。藉由將樹脂之黏度設為10Pa.s 以上,導熱片之成形變得容易。另一方面,藉由將樹脂之黏度設為2000Pa.s以下,導熱片之壓縮強度變低,而柔軟性提昇。
再者,樹脂之黏度可藉由實施例所述之方法進行測定。
就使柔軟性良好之觀點而言,導熱片(A)之整體之凝膠分率較佳為50%以下,更佳為40%以下,進而較佳為20%以下。
又,導熱片(A)之表層部之凝膠分率可與內層部之凝膠分率相同,亦可表層部之凝膠分率高於內層部之凝膠分率。
(積層體)
本發明之導熱片(A)可為單層,亦可為積層體。就使導熱性良好之觀點而言,較佳為積層有包含樹脂及非球狀填料之樹脂層之積層體。以下,利用圖1對積層有包含樹脂及非球狀填料之樹脂層之積層體的實施形態之一例進行說明。
於圖1中,為了使作為非球狀填料之板狀導熱性填料6之存在明確,而將表示樹脂之剖面之影線(hatching)省略。又,於各圖中,各填料係與上下相鄰之填料重疊,但於本發明中,填料彼此並非必須重疊。
如圖1所示,導熱片1具有積層多個樹脂層2而成之構造。多個樹脂層2之相對於積層面之垂直面成為樹脂片1之表面即片材面5。
導熱片1之厚度(即,片材面5與片材面5之間之距離)並無特別限定,例如可設為0.1~30mm之範圍。
樹脂層2之1層之厚度(樹脂層寬度)並無特別限定,可設為較佳為1000μm以下、更佳為500μm以下,且較佳為0.1μm以上、更佳為0.5μm以上、進而較佳為1μm以上。藉由以此方式調整厚度,能夠提高導熱性。
樹脂層2係含有導熱性填料6之導熱性樹脂層7。導熱性樹脂層7具有於樹脂8中分散有導熱性之導熱性填料6的構造。
於各樹脂層2中,導熱性填料係如上述般以相對於片材面為大於45°之角度、更佳為50°以上、進而較佳為60°以上、進而較佳為70°以上、進而較佳為80°以上之角度配向。
導熱性樹脂層7之厚度為導熱性樹脂層7中所包含之導熱性填料6之厚度的較佳為1~1000倍、更佳為1~500倍。
藉由將導熱性樹脂層7之寬度設為上述範圍,容易使導熱性填料6配向成其長軸相對於上述片材面為接近90°之角度。再者,導熱性樹脂層7之寬度只要為上述範圍內,則亦可不均等。
[導熱片(A)之製造方法]
本發明之導熱片(A)之製造方法並無特別限定,於製造單層之導熱片(A)之情形時,例如只要將非球狀之導熱性填料、樹脂、及視需要之添加劑供給至擠出機中並進行熔融混練,之後自擠出機擠出為片狀,藉此將導熱片成形即可。
(積層體之製造方法)
本發明之由積層體所構成之導熱片(A)之製造方法並無特別限定,可如以下所說明般藉由包括混練步驟、積層步驟、進而視需要之切片步驟之方法進行製造。
<混練步驟>
將導熱性填料與樹脂進行混練而製作導熱性樹脂組成物。
上述混練例如較佳為使用Plastomill等雙軸螺旋混練機或雙軸擠出機等將導熱性填料與樹脂於加熱下進行混練,藉此可獲得於樹脂中均勻地分散有導熱性填料之導熱性樹脂組成物。
繼而,藉由對該導熱性樹脂組成物進行加壓,可獲得片狀之樹脂層(導熱性樹脂層)。
<積層步驟>
於積層步驟中,將上述混練步驟中所獲得之樹脂層進行積層而製成n層構造之積層體。作為積層方法,例如可使用如下方法:對混練步驟中所製作之樹脂層進行Xi分割後進行積層,製作Xi層構造之積層體後,視需要進行熱壓,之後進而視需要反覆進行分割、積層及上述熱壓,而製作寬度為D μm且n層構造之積層體。
於導熱性填料為板狀之情形時,積層步驟後之積層體之寬度(D μm)、上述導熱性填料之厚度(d μm)較佳為滿足0.0005≦d/(D/n)≦1,更佳為滿足0.001≦d/(D/n)≦1,進而較佳為滿足0.02≦d/(D/n)≦1。
如上述般進行多次成形之情形時,可使每次中之成形壓力小於以1次成形進行之情形,因此,能夠避免由成形引起之積層構造之破壞等現象。
作為其他積層方法,例如亦可使用如下方法:使用具備多層形成塊之擠出機製備上述多層形成塊,藉由共擠出成形而獲得上述n層構造且上述厚度D μm之積層體。
具體而言,於第1擠出機及第2擠出機之兩者中導入上述混練步驟中所獲得之導熱性樹脂組成物,自第1擠出機及第2擠出機同時擠出導熱性樹脂組成物。自第1擠出機及第2擠出機所擠出之導熱性樹脂組成物被送至餵料塊。於餵料塊中自第1擠出機及上述第2擠出機所擠出之導熱性樹脂組成物合流。藉此,可獲得積層有導熱性樹脂組成物之2層體。繼而,將上述2層體移送至多層形成塊,沿與擠出方向平行之方向且垂直於積層面之多個面將2層體分割為多個後,進行積層,而可製作n層構造且厚度D μm之積層體。此時,每1層之厚度(D/n)可調整多層形成塊而設為所需之值。
(切片步驟)
藉由將上述積層步驟中所獲得之積層體在與積層方向平行之方向上進行切 片,可製作導熱片(A)。
(其他步驟)
於導熱片(A)之製造方法中,亦可設置使樹脂交聯之步驟。交聯例如藉由照射電子束、α射線、β射線、γ射線等游離輻射之方法、使用有機過氧化物之方法等進行即可。但是,於提高導熱片(A)之表層部之凝膠分率之情形時,較佳為於切片步驟之後對片材面(片材表面)照射游離輻射,游離輻射之中,較佳為電子束。以提高表層部之凝膠分率為目的而進行電子束照射之情形時之加速電壓較佳為200~700kV,更佳為250~500kV。電子束照射之照射量較佳為200~450kGy,更佳為250~400kGy。
[含有球狀填料之導熱片(B)]
對本發明之導熱片為含有球狀填料作為導熱性填料之導熱片(B)的情形進行說明。於使用球狀填料之情形時,由於相較於非球狀填料各向異性較小,故而導熱率不易根據導熱片中之填料之存在狀態(配向狀態)而變動。因此,容易相對簡單且穩定地製造導熱片。
導熱性填料之平均粒徑並無特別限定,較佳為0.5~100μm,更佳為5~50μm。平均粒徑可利用雷射繞射式粒度分佈測定裝置測定粒度分佈而求出。
導熱片(B)中之導熱性填料之含量相對於樹脂100質量份,較佳為1000~3000質量份,更佳為1500~2500質量份。若為1000質量份以上,則導熱性變高,而容易達成本發明中所規定之導熱率。若為3000質量份以下,則柔軟性容易變得良好。
又,導熱片(B)中之導熱性填料之體積比率較佳為65~95體積%,更佳為70~90體積%。該導熱性填料之體積比率係以導熱片總量基準計之值,能夠根據構成導熱片之各成分之質量算出。例如,可藉由用各成分之質量除以各成 分於23℃之密度而算出。
如上所述,就使導熱性良好之觀點而言,導熱片(B)較佳為使用相對大量之導熱性填料。通常,若大量地使用導熱性填料,則導熱片之柔軟性容易下降,但藉由調整樹脂之黏度,可抑制柔軟性之下降。
於導熱片(B)中,樹脂於25℃之黏度較佳為10Pa.s以下,更佳為5Pa.s以下。藉由將樹脂之黏度設為10Pa.s以下,導熱片之柔軟性容易變得良好。又,通常樹脂之黏度為0.001Pa.s以上。
再者,樹脂之黏度可藉由實施例所述之方法進行測定。
導熱片(B)之厚度並無特別限制,例如可設為0.1~30mm之範圍。
就使操作性良好之觀點而言,導熱片(B)較佳為進行交聯。因此,導熱片(B)整體之凝膠分率較佳為2~50%,較佳為3~30%,更佳為5~20%。藉由設為2%以上,導熱片(B)之操作性變得良好,藉由設為50%以下,柔軟性變得良好。
就使操作性更良好之觀點而言,導熱片(B)較佳為至少一表層部之凝膠分率大於內層部之凝膠分率。更佳為兩表層部之凝膠分率均大於內層部之凝膠分率。
[導熱片(B)之製造方法]
本發明之由積層體所構成之導熱片(B)之製造方法並無特別限定,例如可依據上述導熱片(A)之製造方法中所說明之混練步驟獲得導熱性樹脂組成物,繼而經由藉由加壓等成形為片狀之步驟進行製造。
導熱片(B)為了使表層部之凝膠分率大於內層部之凝膠分率,較佳為於成形為片狀之步驟之後,進行對至少一表面(片材面)照射電子束、α射線、β射線、γ射線等游離輻射之步驟。其中,較佳為進行照射電子束之步驟。
就使導熱片(B)之操作性良好之觀點而言,進行電子束照射之情形時之加速電壓較佳為200~700kV,更佳為250~600kV。就相同之觀點而言,照射量較佳為200~500kGy,更佳為250~400kGy。
本發明之導熱片如上所述導熱性、柔軟性、操作性優異。利用此種特性,可藉由將本發明之導熱片配置於例如電子機器內部之發熱體與散熱體之間而促進自發熱體向散熱體之熱散逸。使用圖1中所說明之導熱片1對該情況進行說明。
如圖2所示,導熱片1係以片材面5與發熱體3或散熱體4接觸之方式配置。又,導熱片1係於發熱體3與散熱體4等2個構件之間以壓縮之狀態配置。再者,發熱體3例如為半導體組件等,散熱體4例如為鋁或銅等金屬等。藉由於此種狀態下使用導熱片1,發熱體3所產生之熱容易向散熱體4進行熱擴散,而能夠實現有效率之散熱。
藉由實施例更詳細地說明本發明,但本發明並不受該等例任何限定。
以下之實施例及比較例中所使用之材料係如下所述。
(1)樹脂
液狀聚異戊二烯橡膠1:可樂麗股份有限公司製造,商品名「LIR-30」
液狀聚異戊二烯橡膠2:可樂麗股份有限公司製造,商品名「LIR-310」
液狀丙烯腈丁二烯橡膠1:JSR股份有限公司製造,商品名「N231L」
丙烯腈丁二烯橡膠2:
下述(A)7.2體積%與下述(B)40.8體積%之混合物
(A)丙烯腈丁二烯橡膠:JSR股份有限公司製造,商品名「N280」
(B)液體丙烯腈丁二烯橡膠:JSR股份有限公司製造,商品名「N231L」
液狀聚丁二烯橡膠1:可樂麗股份有限公司製造,商品名「L-1203」氫化實施等級
液狀聚丁二烯橡膠2:可樂麗股份有限公司製造,商品名「LBR-300」
液狀聚丁二烯橡膠3:Cray Valley公司製造,商品名「Ricon130」
液狀EPDM(液狀乙烯-丙烯-二烯橡膠):三井化學股份有限公司製造,商品名「PX-068」
液狀聚矽氧1:信越化學工業股份有限公司製造,商品名「KF-96H-10萬cs」
液狀聚矽氧2:信越化學工業股份有限公司製造,商品名「KF-96H-500cs」
(2)導熱性填料
(i)氮化硼Denka公司製造,商品名「SGP」
形狀:板狀(鱗片狀)
縱橫比:20
長邊方向導熱率:250W/m.K
厚度:1μm
(ii)石墨烯Bridgestone KBG公司製造,商品名「WGNP」
形狀:板狀(薄片狀)
縱橫比:15
長邊方向導熱率:1000W/m.K
厚度:2μm
(iii)氧化鋁(alumina)昭和電工股份有限公司製造,商品名「AS-20」
形狀:球狀
平均粒徑:22μm
各種物性、評價方法如下所述。
<黏度>
於25℃,利用B型黏度計(東洋產業公司製造)對樹脂50g進行測定。
<導熱率>
使用雷射閃光法熱常數測定裝置(NETZSCH公司製造之「LFA447」)對所獲得之導熱片之厚度方向之導熱率進行測定。
<30%壓縮強度>
使用A&D公司製造之「RTG-1250」測定所獲得之導熱片之30%壓縮強度。將樣品尺寸設為2mm×15mm×15mm,將測定溫度設為23℃,將壓縮速度設為1mm/min而進行測定。
<拉伸強度>
使用A&D公司製造之「RTG-1250」測定所獲得之導熱片之拉伸強度。將樣品尺寸設為1.5mm×10mm×60mm,將測定溫度設為23℃,將拉伸速度設為500mm/min而進行測定。
<凝膠分率>
如下述般測定導熱片之凝膠分率。
稱取A g導熱片,將其於120℃之二甲苯中浸漬24小時並利用200網目之金屬絲網過濾不溶解成分,對金屬絲網上之殘渣進行真空乾燥並測定乾燥殘渣之重量(B g),根據自導熱片之重量及填料摻合比率算出之導熱片內之填料重量(C g),藉由下述式算出。再者,於各實施例、比較例中,針對導熱片,於厚度方向上均等地進行採取而測定凝膠分率。
凝膠分率(重量%)=((B-C)/A)×100
<配向角度>
利用掃描式電子顯微鏡(日立製作所股份有限公司製造之S-4700)觀察導熱片之剖面。根據倍率3000倍之觀察畫像,針對任意20個填料,測定與片材面 所成之角,將其平均值作為配向角度。
<操作性之評價>
將尺寸1.5mm×20mm×100mm之導熱片以40℃貼附於膜(材質為PET)。之後,以23℃、剝離角度90°、剝離速度30mm/分鐘之條件進行剝離試驗。
A:能夠將導熱片剝離乾淨
B:導熱片於剝離中被撕斷(斷裂)
實施例1
將由液狀聚異戊二烯橡膠1(可樂麗股份有限公司製造,商品名「LIR-30」)100質量份及氮化硼(Denka公司製造,商品名「SGP」)400質量份所構成之混合物熔融混練後,進行加壓,藉此獲得厚度0.5mm、寬度80mm、深度80mm之片狀樹脂層。然後,作為積層步驟,將所獲得之樹脂層進行16等分並進行重疊而獲得總厚度8mm、寬度20mm、深度20mm之由16層所構成之積層體。繼而與積層方向平行地進行切片,而獲得厚度2mm、寬度8mm、深度20mm之導熱片。構成該導熱片之積層體之樹脂層之1層之厚度為0.5mm(500μm)。對該導熱片測定導熱率、30%壓縮強度、配向角度、拉伸強度、凝膠分率,並進行操作性之評價。導熱率係自片材之剖面方向(厚度方向)進行測定。將評價結果示於表1。
實施例2~9、比較例3
如表1中所記載般變更摻合,除此以外,以與實施例1相同之方式獲得導熱片,並進行各測定及評價。將結果示於表1、2。
實施例10
將摻合設為如表1,且以與實施例1相同之方式獲得導熱片。繼而,以電子束照射後之導熱片之表層部之凝膠分率變得大於內層部之凝膠分率之方式對該導熱片之兩面照射加速電壓300kV、劑量400kGy之電子束,而使兩表層部交 聯。對所獲得之導熱片進行各測定及評價。將結果示於表1。
實施例11
將由液狀聚丁二烯橡膠3(Cray Valley公司製造,商品名「Ricon130」)100質量份及氧化鋁(昭和電工股份有限公司製造,商品名「AS-20」)2000質量份所構成之混合物熔融混練後,進行加壓,藉此獲得厚度2mm、寬度80mm、深度80mm之導熱片。繼而,以電子束照射後之導熱片之表層部之凝膠分率變得大於內層部之凝膠分率之方式,對該導熱片之兩面照射加速電壓300kV、劑量400kGy之電子束,而使兩表層部交聯。對所獲得之導熱片進行各測定及評價。將結果示於表1。
比較例1
將由液狀聚矽氧2(信越化學工業股份有限公司製造,商品名「KF-96H-500cs」)100質量份及氮化硼(Denka公司製造,商品名「SGP」)260質量份所構成之混合物熔融混練後,進行加壓,但無法成形為片狀。
比較例2
將由液狀聚丁二烯橡膠3(Cray Valley公司製造,商品名「Ricon130」)100質量份及氧化鋁(昭和電工股份有限公司製造,商品名「AS-20」)2000質量份所構成之混合物熔融混練後,進行加壓,藉此獲得厚度2mm、寬度80mm、深度80mm之導熱片。對所獲得之導熱片進行各測定及評價。將結果示於表2。
比較例4
將照射電子束之條件設為加速電壓750kV、劑量450kGy,除此以外,以與實施例10相同之方式獲得導熱片。對所獲得之導熱片進行各測定及評價。將結果示於表2。
本發明之導熱片即實施例1~11係導熱率及柔軟性較高,且操作性良好,作為導熱片優異。
相對於此,比較例1~4不滿足本發明之任一要件,與實施例之導熱片相比性能差。於比較例1中,無法成形導熱片。認為其原因在於使用黏度較低之樹脂。
比較例2係使用球狀填料,雖為與實施例11相同之組成,但拉伸強度較低,操作性較差。認為其原因在於:比較例2未進行電子束照射,因此表面層未交聯。
比較例3係導熱率變低,認為其原因在於導熱性填料之量較少。
比較例4係與實施例10相同之組成,但壓縮強度較高,柔軟性較差。認為其原因在於:比較例4係對導熱片進行之電子束照射之加速電壓及照射量較高,由此交聯過度地進行,而片材變硬。
1‧‧‧導熱片
2‧‧‧樹脂層
5‧‧‧片材面
6‧‧‧導熱性填料
7‧‧‧導熱性樹脂層
8‧‧‧樹脂
Claims (12)
- 一種導熱片,其含有導熱性填料及樹脂,其特徵在於:導熱率為7W/m.K以上,30%壓縮強度為1500kPa以下,拉伸強度為0.08MPa以上,上述樹脂為橡膠或彈性體樹脂,且上述導熱性填料之含量相對於樹脂100質量份為180~3000質量份。
- 如請求項1所述之導熱片,其中,上述導熱性填料為非球狀填料。
- 如請求項1所述之導熱片,其中,上述導熱性填料之縱橫比為10以上。
- 如請求項1所述之導熱片,其中,上述導熱性填料之體積比率為35~75體積%。
- 一種導熱片,其含有導熱性填料及樹脂,其特徵在於:導熱率為7W/m.K以上,30%壓縮強度為1500kPa以下,拉伸強度為0.08MPa以上,且含有選自由丙烯腈丁二烯橡膠、乙烯-丙烯-二烯橡膠、聚異戊二烯橡膠、聚丁二烯橡膠、聚矽氧所組成之群中之至少1種樹脂,上述導熱性填料為球狀填料,上述導熱性填料之含量相對於樹脂100質量份為1000~3000質量份。
- 如請求項1或5所述之導熱片,其中,上述導熱性填料以其長軸相對於片材面為60°以上之角度配向。
- 如請求項1或5所述之導熱片,其中,上述樹脂於25℃之黏度為10~2000Pa.s。
- 如請求項5所述之導熱片,其中,上述樹脂之黏度為10Pa.s以下。
- 如請求項5所述之導熱片,其中,上述導熱性填料之體積比率為65~95體積%。
- 如請求項1或5所述之導熱片,其中,至少一表層部之凝膠分率大於內層部之凝膠分率。
- 如請求項1或5所述之導熱片,其中,上述導熱性填料之導熱率為12W/m.K以上。
- 如請求項1或5所述之導熱片,其中,上述樹脂之玻璃轉移溫度為25℃以下。
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