WO2021079714A1 - 熱伝導性シリコーン組成物及びその製造方法 - Google Patents
熱伝導性シリコーン組成物及びその製造方法 Download PDFInfo
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- WO2021079714A1 WO2021079714A1 PCT/JP2020/037438 JP2020037438W WO2021079714A1 WO 2021079714 A1 WO2021079714 A1 WO 2021079714A1 JP 2020037438 W JP2020037438 W JP 2020037438W WO 2021079714 A1 WO2021079714 A1 WO 2021079714A1
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- 229920001296 polysiloxane Polymers 0.000 title claims abstract description 95
- 239000000203 mixture Substances 0.000 title claims abstract description 84
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000002245 particle Substances 0.000 claims abstract description 49
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 44
- 229920002545 silicone oil Polymers 0.000 claims abstract description 20
- 125000001931 aliphatic group Chemical group 0.000 claims abstract description 19
- 239000002904 solvent Substances 0.000 claims abstract description 17
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000012756 surface treatment agent Substances 0.000 claims abstract description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 30
- 238000002156 mixing Methods 0.000 claims description 20
- 229910052710 silicon Inorganic materials 0.000 claims description 19
- 125000004432 carbon atom Chemical group C* 0.000 claims description 18
- 125000003342 alkenyl group Chemical group 0.000 claims description 17
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 17
- 125000000217 alkyl group Chemical group 0.000 claims description 11
- 229920006136 organohydrogenpolysiloxane Polymers 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 238000009835 boiling Methods 0.000 claims description 7
- 125000001183 hydrocarbyl group Chemical group 0.000 claims 2
- -1 isobutenyl group Chemical group 0.000 description 43
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 23
- 239000000843 powder Substances 0.000 description 15
- 150000002430 hydrocarbons Chemical group 0.000 description 14
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 11
- 229910052697 platinum Inorganic materials 0.000 description 10
- 239000010703 silicon Substances 0.000 description 9
- 229920001577 copolymer Polymers 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 8
- 125000003118 aryl group Chemical group 0.000 description 7
- 239000004205 dimethyl polysiloxane Substances 0.000 description 7
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 7
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 7
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 6
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 6
- 229910004283 SiO 4 Inorganic materials 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229920001843 polymethylhydrosiloxane Polymers 0.000 description 5
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 4
- 238000007259 addition reaction Methods 0.000 description 4
- 125000003710 aryl alkyl group Chemical group 0.000 description 4
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 4
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 4
- 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 4
- 125000002704 decyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 4
- 125000005388 dimethylhydrogensiloxy group Chemical group 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 125000005843 halogen group Chemical group 0.000 description 4
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 4
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 4
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 4
- 238000007561 laser diffraction method Methods 0.000 description 4
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 4
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 4
- 125000000286 phenylethyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])C([H])([H])* 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000011231 conductive filler Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000006459 hydrosilylation reaction Methods 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 125000001624 naphthyl group Chemical group 0.000 description 3
- 125000001971 neopentyl group Chemical group [H]C([*])([H])C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 3
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- 125000004344 phenylpropyl group Chemical group 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000000790 scattering method Methods 0.000 description 3
- 125000005023 xylyl group Chemical group 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical compound C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 description 2
- QYLFHLNFIHBCPR-UHFFFAOYSA-N 1-ethynylcyclohexan-1-ol Chemical compound C#CC1(O)CCCCC1 QYLFHLNFIHBCPR-UHFFFAOYSA-N 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- DSVRVHYFPPQFTI-UHFFFAOYSA-N bis(ethenyl)-methyl-trimethylsilyloxysilane;platinum Chemical compound [Pt].C[Si](C)(C)O[Si](C)(C=C)C=C DSVRVHYFPPQFTI-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 125000004369 butenyl group Chemical group C(=CCC)* 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 125000004218 chloromethyl group Chemical group [H]C([H])(Cl)* 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229920005645 diorganopolysiloxane polymer Polymers 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- ZKVLEFBKBNUQHK-UHFFFAOYSA-N helium;molecular nitrogen;molecular oxygen Chemical compound [He].N#N.O=O ZKVLEFBKBNUQHK-UHFFFAOYSA-N 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 125000000555 isopropenyl group Chemical group [H]\C([H])=C(\*)C([H])([H])[H] 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 150000002903 organophosphorus compounds Chemical class 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 125000004368 propenyl group Chemical group C(=CC)* 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- IMFACGCPASFAPR-UHFFFAOYSA-N tributylamine Chemical compound CCCCN(CCCC)CCCC IMFACGCPASFAPR-UHFFFAOYSA-N 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- 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
- H01L23/3737—Organic materials with or without a thermoconductive filler
-
- 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
- C08K3/02—Elements
- C08K3/08—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
- C08K3/18—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
- C08K5/00—Use of organic ingredients
- C08K5/01—Hydrocarbons
-
- 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
-
- 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
- C08L83/14—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 in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/12—Polysiloxanes containing silicon bound to hydrogen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
- C08G77/18—Polysiloxanes containing silicon bound to oxygen-containing groups to alkoxy or aryloxy groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
-
- 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
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
-
- 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
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
Definitions
- the present invention relates to a thermally conductive silicone composition having high thermal conductivity and excellent displacement resistance, and a method for producing the same.
- heat conductive material In general, electric and electronic parts generate heat during use, so it is necessary to remove heat in order to operate the electric parts properly, and various heat conductive materials for heat removal have been proposed.
- This heat conductive material is roughly classified into two types: 1) a sheet-like material that is easy to handle, and 2) a paste-like material.
- the sheet-shaped material has the advantages of being easy to handle and excellent in stability, but the heat dissipation performance is inferior to that of the paste-shaped material because the contact thermal resistance is large due to its nature. Further, a certain level of strength / hardness is required to maintain the sheet shape, the tolerance generated between the electric / electronic component element and the heat radiating member cannot be absorbed, and the element may be destroyed by the stress.
- the paste-like material can be adapted to mass production by using a coating device or the like, and has excellent heat dissipation performance due to its low contact thermal resistance.
- the viscosity of the paste should be low, but if the viscosity is low, the paste will shift due to the cold impact of the element (pump-out phenomenon), and heat removal will not be sufficient. Therefore, as a result, the element may malfunction.
- the following silicone compositions have been proposed as past techniques, but there has been a demand for a thermally conductive silicone composition having more sufficient performance and excellent displacement resistance.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a thermally conductive silicone composition having high thermal conductivity and excellent workability and displacement resistance, and a method for producing the same.
- a thermally conductive silicone composition containing a powder and further containing a volatile solvent, particularly an isoparaffinic solvent having a boiling point of 80 to 360 ° C., has both workability and pump-out resistance while having high thermal conductivity. We have found that it can be achieved and have come to the present invention.
- the present invention provides the following thermally conductive silicone composition and a method for producing the same.
- (C-1) Aluminum powder having an average particle size of 40 ⁇ m or more and 100 ⁇ m or less: an amount of 30 to 70% by mass in the component (C).
- (C-2) Aluminum powder having an average particle size of 6 ⁇ m or more and less than 40 ⁇ m: an amount of 10 to 60% by mass in the component (C).
- (C-3) Aluminum powder having an average particle size of 0.4 ⁇ m or more and less than 6 ⁇ m: an amount of 10 to 60% by mass in the component (C).
- (D) Zinc oxide powder having an average particle size of 0.1 to 10 ⁇ m: 50 to 500 parts by mass with respect to a total of 100 parts by mass of the components (A) and (B), and (E) volatile solvent: (A) ), (B) A thermally conductive silicone composition containing 10 to 300 parts by mass with respect to 100 parts by mass in total.
- the component (B) contains a silicone oil (B-1) composed of a one-terminal hydrolyzable organopolysiloxane represented by the following general formula (1), and the blending amounts of the component (B) are (A) and ( B) The thermally conductive silicone composition according to [1], which is an amount that is 10 to 90% by mass of the total amount of the components.
- R 1 independently represents an alkyl group having 1 to 6 carbon atoms
- R 2 is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 18 carbon atoms and having no aliphatic unsaturated bond.
- c is a number from 1.7 to 2.2, where b + c is a number that satisfies 1.9 to 2.4.
- Organopolysiloxane which has at least one alkenyl group bonded to a silicon atom represented by.
- a molecule having at least four hydrogen atoms bonded to a silicon atom at the non-terminal of the molecular chain has the following formula (3). 0.1 ⁇ / ⁇ (3) (In the formula, ⁇ represents the number of hydrogen atoms bonded to silicon atoms at the non-terminal of the molecular chain, and ⁇ represents the total number of silicon atoms in the component (G).)
- Organohydrogen polysiloxane that meets the requirements.
- the component (B) further contains a non-functional liquid silicone oil having a kinematic viscosity at 25 ° C. of (B-2) of 10 to 500,000 mm 2 / s in an amount of 10 to 70% by mass in the component (B) [1]. ] To [3]. The thermally conductive silicone composition according to any one of [3]. [5] The thermally conductive silicone composition according to any one of [1] to [4], wherein the component (E) is an isoparaffin-based solvent having a boiling point of 80 to 360 ° C.
- (C-3) Aluminum powder having an average particle size of 0.4 ⁇ m or more and less than 6 ⁇ m: an amount of 10 to 60% by mass in the component (C).
- (D) Zinc oxide powder having an average particle size of 0.1 to 10 ⁇ m: 50 to 500 parts by mass with respect to a total of 100 parts by mass of the components (A) and (B), and (E) volatile solvent: (A) ),
- (B) A method for producing a thermally conductive silicone composition, which comprises a step of mixing 10 to 300 parts by mass with respect to a total of 100 parts by mass of the components.
- the thermally conductive silicone composition of the present invention has high thermal conductivity, yet has high workability and improved pump-out resistance.
- the silicone gel crosslinked product of the component (A) is used as a matrix of the thermally conductive silicone composition of the present invention.
- the component (A) is preferably obtained by subjecting the following components (F) and (G) to a hydrosilylation reaction (addition reaction) in the presence of the component (H).
- (F) The following average composition formula (2) R 3 b R 4 c SiO (4-bc) / 2 (2) (In the formula, R 3 represents an alkenyl group, R 4 represents an unsubstituted or substituted monovalent hydrocarbon group having no aliphatic unsaturated bond, and b is a number from 0.0001 to 0.2.
- c is a number from 1.7 to 2.2, where b + c is a number that satisfies 1.9 to 2.4.
- Organopolysiloxane which has at least one alkenyl group bonded to a silicon atom represented by.
- G A molecule having at least four hydrogen atoms bonded to a silicon atom at the non-terminal of the molecular chain has the following formula (3). 0.1 ⁇ / ⁇ (3) (In the formula, ⁇ represents the number of hydrogen atoms bonded to silicon atoms at the non-terminal of the molecular chain, and ⁇ represents the total number of silicon atoms in the component (G).)
- Organohydrogen polysiloxane which meets (H) Platinum-based catalyst.
- the component (F) is a component that serves as a main component of the component (A).
- the component (F) is an organopolysiloxane having at least one alkenyl group bonded to a silicon atom (hereinafter referred to as "silicon atom-bonded alkenyl group") in one molecule represented by the above average composition formula (2). ..
- the alkenyl group preferably has at least 2 in one molecule, more preferably 2 to 50, and particularly preferably 2 to 20.
- alkenyl groups may be attached to a silicon atom at the end of the molecular chain, a silicon atom at the non-terminal of the molecular chain (that is, other than both ends of the molecular chain), or a combination thereof. Good.
- R 3 usually represents an alkenyl group having 2 to 6 carbon atoms, preferably 2 to 4 carbon atoms. Specific examples thereof include lower alkenyl groups such as a vinyl group, an allyl group, a propenyl group, an isopropenyl group, a butenyl group, and an isobutenyl group, and a vinyl group is preferable.
- R 4 usually represents an unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms, preferably 1 to 6 aliphatic unsaturated bonds.
- alkyl group such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a tert-butyl group, a pentyl group, a hexyl group, a cyclohexyl group, an octyl group and a decyl group; a phenyl group.
- Aryl groups such as trill groups; Aralkyl groups such as benzyl groups and phenylethyl groups; Chloromethyl groups in which some or all of the hydrogen atoms of these groups are substituted with halogen atoms such as fluorine and chlorine, 3,3 , 3-Trifluoropropyl group and the like, but from the viewpoint of ease of synthesis and the like, a methyl group, a phenyl group and a 3,3,3-trifluoropropyl group are preferable.
- b, c, and b + c are as described above, but b is preferably a number of 0.0005 to 0.1, and c is a number of 1.9 to 2.0. It is preferable that b + c is a number satisfying 1.95 to 2.05.
- the molecular structure of the organopolysiloxane of the component (F) is not particularly limited, and is linear; R 3 SiO 3/2 units, R 4 SiO 3/2 units, SiO 2 units (in the formula) in a part of the molecular chain. , R 3 and R 4 are as defined above), etc., and may be branched; cyclic; three-dimensional network (resin), etc., but usually the main chain is the basic. It is a linear diorganopolysiloxane consisting of repeating diorganosiloxane units and having both ends of the molecular chain sealed with a triorganosyloxy group.
- (F) kinematic viscosity of the organopolysiloxane of the component is preferably from 50 ⁇ 100,000mm 2 / s at 25 ° C., more preferably 100 ⁇ 10,000mm 2 / s.
- the kinematic viscosity is 50 to 100,000 mm 2 / s, the obtained cured product has excellent fluidity and workability.
- the kinematic viscosity is a value at 25 ° C. by an Ostwald viscometer (hereinafter, the same applies).
- organopolysiloxane of the component (F) examples include the following general formula (4).
- R 5 independently represents an unsubstituted or substituted monovalent hydrocarbon group, except that at least one, preferably two or more of R 5 is an alkenyl group, and d is 20 to 2,000. Is an integer of.
- the ones represented by are mentioned.
- the unsubstituted or substituted monovalent hydrocarbon group represented by R 5 is R 3 (alkenyl group) and R 4 (unsubstituted or substituted 1 having no aliphatic unsaturated bond). It is the same as that defined in (valent hydrocarbon group), and its carbon number, specific examples, etc. are also the same. Further, d is preferably an integer of 40 to 1,200, and more preferably an integer of 50 to 600.
- organopolysiloxane represented by the above formula (4) include dimethylpolysiloxane having both ends of the molecular chain dimethylvinylsiloxy group blocked, dimethylpolysiloxane having one end of the molecular chain trimethylsiloxy group and one end dimethylvinylsiloxy group blocking dimethylpolysiloxane.
- the organopolysiloxane of the component (F) may be used alone or in combination of two or more.
- the component (G) reacts with the component (F) and acts as a cross-linking agent.
- the component (G) has sufficient resistance when the number of hydrogen atoms bonded to a silicon atom at the non-terminal of the molecular chain (that is, a SiH group, hereinafter referred to as "silicon atom-bonded hydrogen atom") is 3 or less in one molecule.
- ⁇ represents the number of hydrogen atoms bonded to silicon atoms at the non-terminal of the molecular chain, and ⁇ represents the total number of silicon atoms in the component (G).
- ⁇ represents the total number of silicon atoms in the component (G).
- It is an organohydrogenpolysiloxane that satisfies the above conditions. If the range of ⁇ / ⁇ is as small as 0.1 or less, the deviation resistance of the present composition deteriorates, so that 0.1 ⁇ / ⁇ is also required at the same time.
- ⁇ / ⁇ is preferably 0.11 or more, particularly 0.12 or more, and the upper limit thereof is not particularly limited, but is preferably 0.95 or less, particularly 0.90 or less.
- the molecular structure of the component (G) is not particularly limited as long as it satisfies the above requirements, and may be any of conventionally known, for example, linear, cyclic, branched, three-dimensional network (resin) and the like. May be good.
- the number of silicon atoms (or degree of polymerization) in one molecule is usually 3 to 1,000. It is preferably 5 to 400 pieces, more preferably 10 to 300 pieces, still more preferably 10 to 100 pieces, and particularly preferably 10 to 60 pieces.
- the kinematic viscosity of the organohydrogenpolysiloxane of the component (G) is usually 1 to 10,000 mm 2 / s, preferably 3 to 5,000 mm 2 / s, and more preferably 5 to 3,000 mm 2 / s. , Liquid at room temperature (25 ° C) is desirable.
- organohydrogenpolysiloxane of the component (G) for example, one represented by the following average composition formula (5) is preferable.
- R 6 e H f SiO (4-ef) / 2 (5) (In the formula, R 6 represents an unsubstituted or substituted monovalent hydrocarbon group having no aliphatic unsaturated bond, e is a number of 0.7 to 2.2, and f is 0.001 to 0. It is a number of 5, where e + f is a number that satisfies 0.8 to 2.5.)
- R 6 is usually an unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms and having no aliphatic unsaturated bond. Specific examples thereof include methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, tert-butyl group, pentyl group, neopentyl group, hexyl group, cyclohexyl group, octyl group, nonyl group and decyl group.
- Alkyl groups such as phenyl group, trill group, xylyl group, naphthyl group and other aryl groups; benzyl group, phenylethyl group, phenylpropyl group and other aralkyl groups; some or all of the hydrogen atoms of these groups are fluorine. , 3,3,3-trifluoropropyl group substituted with halogen atom such as chlorine, preferably alkyl group, aryl group, 3,3,3-trifluoropropyl group, more preferably methyl. Group, phenyl group, 3,3,3-trifluoropropyl group.
- e, f, and e + f are as described above, but e is preferably a number of 0.9 to 2.1, and f is a number of 0.002 to 0.2, particularly. The number is preferably 0.005 to 0.1, and e + f is preferably a number satisfying 1.0 to 2.3, particularly 1.5 to 2.2.
- the molecular structure of the organohydrogenpolysiloxane represented by the above formula (5) is not particularly limited, and may be any of linear, cyclic, branched, three-dimensional network (resin) and the like. Among them, those in which the number of silicon atoms and the kinematic viscosity in one molecule satisfy the above-mentioned ranges, and those having a linear shape are particularly preferable.
- organohydrogenpolysiloxane represented by the above formula (5) include a trimethylsiloxy group-blocked dimethylsiloxane / methylhydrogensiloxane copolymer at both ends of the molecular chain and a trimethylsiloxy group-blocked methylhydrogen at both ends of the molecular chain.
- the blending amount of the component (G) is such that the number of silicon atom-bonded hydrogen atoms in the component (G) is 0.3 to 2.0 with respect to one silicon atom-bonded alkenyl group in the component (F).
- the amount is preferably 0.4 to 1.5, and more preferably 0.5 to 1.0.
- the number of silicon atom-bonded hydrogen atoms is less than 0.3, the crosslink density becomes too low, the deviation resistance of the obtained thermally conductive silicone composition deteriorates, and when the number is more than 2.0, it is obtained. This is because the viscosity of the thermally conductive silicone composition becomes too high and the handleability deteriorates.
- the organohydrogenpolysiloxane of the component (G) may be used alone or in combination of two or more.
- the component (H) is a component for accelerating the addition reaction between the silicon atom-bonded alkenyl group in the component (F) and the silicon atom-bonded hydrogen atom in the component (G).
- the component (H) is a platinum-based catalyst, specifically platinum and / or a platinum-based compound.
- platinum and platinum-based compounds can be used. Specifically, for example, platinum black; chloroplatinic acid; alcohol-modified product of chloroplatinic acid; chloroplatinic acid and olefin aldehyde, vinyl siloxane. , Complexes such as acetylene alcohols and the like.
- the blending amount of the component (H) may be an effective amount and may be appropriately increased or decreased according to a desired curing rate, but is usually 0.1 to 1 in terms of mass of platinum atom with respect to the component (F). It is 000 ppm, preferably 1 to 300 ppm. If this amount is too small, the addition reaction may be significantly slowed down or cross-linking may not occur. If this amount is too large, not only the heat resistance of the cured product is lowered, but also platinum is expensive, which is disadvantageous in terms of cost.
- the platinum-based catalyst of the component (H) may be used alone or in combination of two or more.
- a reaction control agent may be used in addition to the above components (F), (G) and (H).
- a reaction control agent a conventionally known reaction control agent used in the addition-curable silicone composition can be used.
- acetylene compounds such as acetylene alcohols (for example, 1-ethynyl-1-cyclohexanol, 3,5-dimethyl-1-hexin-3-ol), and various nitrogen compounds such as tributylamine, tetramethylethylenediamine, and benzotriazole.
- Organic phosphorus compounds such as triphenylphosphine, oxime compounds, organic chloro compounds and the like.
- the silicone gel crosslinked product of the component (A) is crosslinked by heating and mixing the component (F) and the component (G) in the presence of the platinum-based catalyst of the component (H), that is, a hydrosilylation reaction (addition reaction). It is obtained by advancing.
- the reaction temperature is usually about 50 to 180 ° C., but is not limited thereto.
- the reaction time is affected by the heating temperature, but usually 0.5 to 12 hours is sufficient for the reaction to proceed.
- a product subjected to such treatment is defined as a "crosslinked product".
- the components (F) and (G) are crosslinked in the presence of the component (H) to obtain the component (A), and then the component (A) is obtained.
- the components (B) to (E) may be mixed, or in order to obtain the component (A), the component (B) is added to the components (F), (G), and (H) in advance before heating.
- the components (F) and (G) may be mixed by heating in the presence of the component (H), and then the components (C), (D) and (E) may be mixed, and further, the component (A) may be mixed.
- the component (B) is a component that does not participate in the cross-linking of the components (F) and (G), and is therefore a silicone oil that does not contain an aliphatic unsaturated bond and a SiH group, and is a component (C) and (D) described later. It is used as a surface treatment agent for the above, and in particular, it is preferably a hydrolyzable organopolysiloxane (B-1) having a trifunctional single end represented by the following general formula (1).
- R 1 independently represents an alkyl group having 1 to 6 carbon atoms
- R 2 is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 18 carbon atoms and having no aliphatic unsaturated bond. Represents one or more groups selected from the group, where a is an integer from 5 to 120.
- the organopolysiloxane of the general formula (1) which is the component (B-1), is used for treating the surface of the heat conductive filler of the components (C) and (D), and is highly filled with powder.
- covering the surface of the powder makes it difficult for the powders to agglomerate with each other, and the effect lasts even at high temperatures. Therefore, it works to improve the heat resistance of the thermally conductive silicone composition of the present invention. is there.
- R 1 includes, for example, an alkyl group having 1 to 6 carbon atoms such as a methyl group, an ethyl group and a propyl group, and a methyl group and an ethyl group are particularly preferable.
- R 2 is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 18 carbon atoms, preferably 1 to 14 carbon atoms and having no aliphatic unsaturated bond, independently of each other.
- Alkyl groups such as phenyl group, trill group, xylyl group, naphthyl group and other aryl groups; benzyl group, phenylethyl group, phenylpropyl group and other aralkyl groups; some or all of the hydrogen atoms of these groups are fluorine.
- 3,3,3-trifluoropropyl group substituted with halogen atom such as chlorine, preferably alkyl group, aryl group, 3,3,3-trifluoropropyl group, more preferably methyl.
- halogen atom such as chlorine
- alkyl group preferably alkyl group
- aryl group 3,3,3-trifluoropropyl group, more preferably methyl.
- phenyl group, 3,3,3-trifluoropropyl group. a is an integer of 5 to 120, preferably an integer of 10 to 90.
- (B-1) a kinematic viscosity at 25 ° C. components preferably 5 ⁇ 500mm 2 / s, more preferably 10 ⁇ 300mm 2 / s.
- the silicone oil of the component (B-1) may be used alone or in combination of two or more.
- a non-functional liquid silicone oil (B-2) having no reactive group may be added to the component (B) of the present invention as the silicone oil not involved in the above-mentioned cross-linking.
- [(B-2) component] (B-2) non-functional liquid silicone oil of component 25 kinematic viscosity at °C is 10 ⁇ 500,000mm 2 / s, is an organopolysiloxane preferably 30 ⁇ 10,000mm 2 / s.
- the kinematic viscosity of the organopolysiloxane is lower than the above lower limit value, the obtained thermally conductive silicone composition tends to bleed oil.
- it is larger than the above upper limit value the viscosity of the obtained composition becomes too high and the handleability becomes poor.
- the non-functional liquid silicone oil of the component (B-2) may be any one having the above kinematic viscosity, and a conventionally known organopolysiloxane can be used.
- the molecular structure of the organopolysiloxane (silicone oil) is not particularly limited, and may be linear, branched, cyclic, or the like.
- the main chain consists of repeating diorganosiloxane units and has a linear structure in which both ends of the molecular chain are closed with a triorganosyloxy group.
- This non-functional liquid silicone oil can be represented by the following average composition formula (6).
- R 7 is independently an unsubstituted or substituted monovalent hydrocarbon group having 1 to 18 carbon atoms, preferably 1 to 14 carbon atoms and having no aliphatic unsaturated bond. Specific examples thereof include methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, tert-butyl group, pentyl group, neopentyl group, hexyl group, cyclohexyl group, octyl group, nonyl group and decyl group.
- Alkyl groups such as phenyl group, trill group, xylyl group, naphthyl group and other aryl groups; benzyl group, phenylethyl group, phenylpropyl group and other aralkyl groups; some or all of the hydrogen atoms of these groups are fluorine. , 3,3,3-trifluoropropyl group substituted with halogen atom such as chlorine, preferably alkyl group, aryl group, 3,3,3-trifluoropropyl group, more preferably methyl. Group, phenyl group, 3,3,3-trifluoropropyl group.
- g is a number in the range of 1.8 to 2.2, particularly in the range of 1.9 to 2.1.
- the obtained thermally conductive silicone composition can have the required good kinematic viscosity.
- organopolysiloxane represented by the above formula (6) a linear organopolysiloxane represented by the following formula (7) is preferable.
- R 8 is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 18 carbon atoms, preferably 1 to 14 carbon atoms and having no aliphatic unsaturated bond, independently of each other.
- the monovalent hydrocarbon group include the same groups as those exemplified by R 7 in the above formula (6). Among them, it is preferable that all R 8 is a methyl group.
- h is the organo kinematic viscosity at 25 ° C. polysiloxane 10 ⁇ 500,000mm 2 / s, preferably 30 ⁇ 10,000mm 2 / s, more preferably a number which is a 100 ⁇ 8,000mm 2 / s.
- the content thereof is preferably 10 to 70% by mass, more preferably 10 to 60% by mass, and further preferably 10 to 50% by mass in the component (B). Is. If the amount of the component (B-2) is too large, the component (B-1) is relatively reduced, so that the surface treatment of the heat conductive filler of the component (D) may be insufficient, and the amount is too small. It may be uneconomical in terms of cost.
- the non-functional liquid silicone oil of the component (B-2) may be used alone or in combination of two or more.
- the blending amount of the silicone oil of the component (B) is preferably 10 to 90% by mass, more preferably 30 to 80% by mass, and further preferably 30 to 80% by mass in the total of the components (A) and (B). It is preferably 50 to 80% by mass. If it is less than 10% by mass, the viscosity of the obtained composition becomes high, which may result in poor handleability, and if it is more than 90% by mass, the displacement resistance of the composition may deteriorate.
- Component (C) The aluminum powder of the component (C) is for imparting thermal conductivity to the thermally conductive silicone composition of the present invention.
- the components (C) are (C-1) component: an aluminum powder having an average particle size of 40 ⁇ m or more and 100 ⁇ m or less, and (C-2) component: an aluminum powder having an average particle size of 6 ⁇ m or more and less than 40 ⁇ m, and (C). -3) Ingredients: Contains aluminum powder having an average particle size of 0.4 ⁇ m or more and less than 6 ⁇ m, and the above-mentioned components (C-1) to (C-3) are blended in a specific ratio. .. It is preferable that the components consist only of the above components (C-1) to (C-3).
- the "average particle size” means the particle size at an integrated value of 50% in the volume-based particle size distribution obtained by the laser diffraction / scattering method.
- the average particle size and particle size distribution of aluminum powder can be measured by a laser diffraction / scattering method, for example, with a Microtrack particle size analyzer MT3300EX (manufactured by Nikkiso Co., Ltd.).
- the shape of the aluminum powder may be irregular, spherical, or any shape, and may be a powder whose surface has been treated in advance.
- the shape of the aluminum powder includes, for example, scaly shape, teardrop shape, spherical shape, needle shape, irregular shape and the like.
- the aluminum powder (C) of the present invention is 800 to 2,000 parts by mass, preferably 900 to 1,800 parts by mass, more preferably 1, with respect to 100 parts by mass of the total of the components (A) and (B). It is contained in an amount of 000 to 1,600 parts by mass. If the content of the aluminum powder of the component (C) is less than the above lower limit value, the thermal conductivity of the composition is low, and if it is more than the above upper limit value, the viscosity of the composition is increased, which is not preferable.
- the component (C-1) is an aluminum powder having an average particle size of 40 ⁇ m or more and 100 ⁇ m or less, preferably 40 ⁇ m or more and 80 ⁇ m or less. If the average particle size of the component (C-1) is smaller than the above lower limit, the thermal conductivity of the thermally conductive silicone composition will decrease. Further, if the average particle size of the component (C-1) is larger than the above upper limit value, the smoothness of the thermally conductive silicone composition is lost, and the contact with the substrate becomes poor when actually used, resulting in heat. Resistance goes up.
- the blending amount of the component (C-1) is 30 to 70% by mass, preferably 40 to 60% by mass, based on the total mass of the component (C): aluminum powder.
- the thermal conductivity of the thermally conductive silicone composition will be low. Further, if the blending amount of the component (C-1) is larger than the above upper limit value, the close-packed structure cannot be formed between the component (C-2) and the component (C-3), and the thermal conductivity is increased. The viscosity of the silicone composition increases.
- the component (C-2) is an aluminum powder having an average particle size of 6 ⁇ m or more and less than 40 ⁇ m, preferably 6 ⁇ m or more and 20 ⁇ m or less, and more preferably 6 ⁇ m or more and 12 ⁇ m or less. If the average particle size of the component (C-2) is smaller than the above lower limit, the close-packed structure cannot be formed with the component (C-3), and the viscosity of the thermally conductive silicone composition increases. It ends up. Further, if the average particle size of the component (C-2) is larger than the above upper limit value, a close-packed structure cannot be formed between the component (C-1) and the component (C-1), and the viscosity of the thermally conductive silicone composition increases. Resulting in.
- the blending amount of the component (C-2) is 10 to 60% by mass, preferably 10 to 40% by mass, and more preferably 15 to 35% by mass in the total mass of the component (C): aluminum powder. If the blending amount of the component (C-2) is less than the above lower limit value, a close-packed structure cannot be obtained with the component (C-3), and the viscosity of the thermally conductive silicone composition increases. Further, even if the blending amount of the component (C-2) is larger than the above upper limit value, the close-packed structure cannot be obtained with the component (C-1), and the viscosity of the thermally conductive silicone composition increases. It ends up.
- the component (C-3) is an aluminum powder having an average particle size of 0.4 ⁇ m or more and less than 6 ⁇ m, more preferably 0.4 ⁇ m or more and 3 ⁇ m or less. If the average particle size of the component (C-3) is smaller than the above lower limit, the viscosity of the thermally conductive silicone composition increases, which is not preferable. Further, if the average particle size of the component (C-3) is larger than the above upper limit value, a close-packed structure cannot be formed between the component (C-2) and the component (C-2), and the viscosity of the thermally conductive silicone composition increases. Resulting in.
- the blending amount of the component (C-3) is 10 to 60% by mass, preferably 10 to 40% by mass, and more preferably 15 to 35% by mass in the total mass of the component (C): aluminum powder. If the blending amount of the component (C-3) is less than the above lower limit value, the close-packed structure cannot be obtained, so that the viscosity of the thermally conductive silicone composition increases. Further, even if the blending amount of the component (C-3) is larger than the above upper limit value, the close-packed structure cannot be obtained with the component (C-2), and the viscosity of the thermally conductive silicone composition increases. ..
- the shape of the volume integration distribution curve by the laser diffraction method of the aluminum powder composed of the above components (C-1), (C-2) and (C-3) is not particularly limited, and the curve is not particularly limited. It may have three maximum peaks, two maximum peaks, or one maximum peak.
- the zinc oxide powder of the component (D) has an average particle size of 0.1 to 10 ⁇ m, preferably 1 to 4 ⁇ m, and the shape of the zinc oxide powder is not particularly limited, for example, a spherical shape, an indefinite shape, or the like. Can be mentioned. If the average particle size of the zinc oxide powder is smaller than 0.1 ⁇ m, the viscosity of the obtained silicone composition becomes high and the handleability becomes poor, and if it is larger than 10 ⁇ m, the obtained silicone composition becomes non-uniform.
- the zinc oxide powder of the component (D) contains 50 to 500 parts by mass, preferably 100 to 400 parts by mass, and more preferably 200 to 300 parts by mass with respect to 100 parts by mass of the total of the components (A) and (B). To do. This is because if the amount is less than 50 parts by mass or more than 500 parts by mass, the viscosity becomes high and the handleability deteriorates.
- the heat conductive silicone composition of the present invention includes titanium oxide powder, alumina powder, boron nitride powder, aluminum nitride powder, diamond powder, gold powder, silver powder, and copper powder.
- one or more powders selected from carbon powder, nickel powder, indium powder, gallium powder, metallic silicon powder, and silica powder have a total of 100 parts by mass of the components (A) and (B)
- the total amount of these powders may be up to 200 parts by mass, preferably up to 150 parts by mass.
- the volatile solvent of the component (E) may be any solvent as long as the components (A) and (B) can be dissolved or dispersed, and for example, toluene, xylene, acetone, methyl ethyl ketone, cyclohexane, n-hexane, n-heptane. , Butanol, IPA (isopropyl alcohol), isoparaffin and the like, and isoparaffin-based solvents are preferable from the viewpoints of safety, health and workability in printing.
- the volatile solvent of the component (E) has a boiling point of 80 to 360 ° C, preferably 150 to 350 ° C. If the boiling point is less than 80 ° C., volatilization is too fast and the viscosity may increase during the coating operation, causing a problem. If the boiling point exceeds 360 ° C., it tends to remain in the thermally conductive silicone composition of the present invention, and the thermal properties may deteriorate.
- the viscosity of the thermally conductive silicone composition of the present invention at room temperature is sufficient. Since it cannot be lowered to the maximum, workability during printing may deteriorate, and if it is more than 300 parts by mass, the filler may settle faster and the heat conductive silicone composition may have poor storage stability. It is preferably in the range of 10 to 300 parts by mass, more preferably in the range of 20 to 200 parts by mass, and further preferably in the range of 20 to 100 parts by mass.
- the viscosity of the composition before containing the component (E) is preferably in the range of 300 to 2,000 Pa ⁇ s, more preferably 400 to 1,500 Pa ⁇ s.
- the range is, more preferably 500 to 1,000 Pa ⁇ s. This is because if it is lower than 300 Pa ⁇ s, the displacement resistance deteriorates, and if it is higher than 2,000 Pa ⁇ s, it is too hard and the semiconductor element may be damaged.
- the viscosity after containing the component (E) is preferably in the range of 10 to 300 Pa ⁇ s, more preferably 30 to 250 Pa ⁇ s, and further preferably 30 to 200 Pa ⁇ s.
- the viscosity is a value at 25 ° C. by a rotational viscometer (hereinafter, the same applies).
- the method for producing the thermally conductive silicone composition of the present invention is not particularly limited, but it can be obtained by mixing the above components (A) to (E), and other components may be added if necessary.
- the mixing device is not particularly limited, and a mixer such as a planetary mixer, a trimix, or a twin mix can be used.
- the components (A) to (E) may be mixed after the component (A) is prepared, and then the components (B) to (E) may be mixed, or the raw material of the component (A) (
- the component (A) may be prepared by mixing (components (F), (G) and (H)) into the components (B) to (E) and then heating.
- the mixture of A) to (D) and the component (E) may be mixed.
- the thermally conductive silicone composition of the present invention is suitable because the volatile solvent volatilizes and the viscosity of the thermally conductive silicone composition increases when it is applied by screen printing or the like and left at room temperature for a certain period of time. Demonstrates slip resistance.
- the thermally conductive silicone composition of the present invention When the thermally conductive silicone composition of the present invention is thinly applied to a heat sink or the like using a printing means such as a metal screen, the contained solvent can be easily volatilized by heating at room temperature or positively. Therefore, a high-performance thermally conductive silicone composition, which has been difficult to apply uniformly and thinly in the past, can be easily put into practical use.
- the thermally conductive silicone composition of the present invention is particularly preferably used for heat dissipation of heat generating devices such as CPUs and GPUs of notebook computers and for heat generating devices of in-vehicle ECUs.
- the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.
- the kinematic viscosity is a value at 25 ° C. by an Ostwald viscometer.
- the tests on Examples and Comparative Examples conducted to clarify the superiority of the present invention were carried out as follows.
- the average particle size of the components (C) and (D) is measured by a laser diffraction / scattering method, and is a volume-based cumulative average diameter measured by a microtrack MT3300EX, which is a particle size analyzer manufactured by Nikkiso Co., Ltd.
- the thermal conductivity of the thermally conductive silicone composition was 25 by TPS-2500S manufactured by Kyoto Denshi Kogyo Co., Ltd. in the hot disk method compliant with ISO 22007-2. Measured at ° C.
- the viscosity of the thermally conductive silicone composition (before and after the addition of the component (E)) is a value at 25 ° C. by a rotational viscometer, and at 25 ° C., a Malcolm viscometer manufactured by Malcolm Co., Ltd. (type PC-10AA). ) was used for measurement.
- a 0.3 mm spacer is provided, and a thermally conductive silicone composition is sandwiched between two slide glass plates so as to form a circle with a diameter of 1.5 cm, and the test piece is tilted 90 degrees with respect to the ground. It was placed in a thermal shock tester (model number: TSE-11-A) manufactured by ESPEC CORPORATION, which was set to alternately repeat 40 ° C and 125 ° C (30 minutes each), and a 500-cycle test was performed. .. After 500 cycles, it was measured how much the thermally conductive silicone composition deviated from its original location. ⁇ Criteria> If it is 1 mm or less, it can be said that the displacement resistance is excellent.
- Examples 1 to 4 As shown in Tables 1 to 3, each component was charged into a planetary mixer, and a thermally conductive silicone composition was prepared by the following procedure. That is, the components (B), (C), (D), and (F) were put into a planetary mixer, and the mixture was first stirred at room temperature for 10 minutes. After that, the components (G) and (H) are added, the temperature is raised to 170 ° C., and the mixture is heated and mixed for 2 hours as it is to carry out a hydrosilylation reaction with the components (F) and (G) (A). ) Ingredients were crosslinked with silicone gel. After cooling this to 40 ° C. or lower, the component (E) was added to obtain a composition. The various tests described above were performed using the obtained composition. The results are also shown in Tables 1 to 3.
- (F) component A linear dimethylpolysiloxane having a vinyl group at both ends and having a kinematic viscosity of 600 mm 2 / s.
- (F-2) A linear dimethylpolysiloxane having a vinyl group at both ends and having a kinematic viscosity of 30,000 mm 2 / s.
- the number in "" in the component (C) indicates the mass% in the component (C) (hereinafter, the same applies). * For convenience, the number of silicon atom-bonded hydrogen atoms in the component (G) with respect to one silicon atom-bonded alkenyl group in the component (F) is designated as H / Vi (hereinafter, the same applies).
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Abstract
Description
〔1〕
(A)シリコーンゲル架橋物、
(B)脂肪族不飽和結合及びSiH基をそれぞれ含有せず、下記(C)、(D)成分の表面処理剤としてのシリコーンオイル、
(C)下記(C-1)~(C-3)を含むアルミニウム粉末:(A)、(B)成分の合計100質量部に対して800~2,000質量部、
(C-1)平均粒径が40μm以上100μm以下であるアルミニウム粉末:(C)成分中30~70質量%となる量、
(C-2)平均粒径が6μm以上40μm未満であるアルミニウム粉末:(C)成分中10~60質量%となる量、
(C-3)平均粒径が0.4μm以上6μm未満であるアルミニウム粉末:(C)成分中10~60質量%となる量、
(D)平均粒径が0.1~10μmである酸化亜鉛粉末:(A)、(B)成分の合計100質量部に対して50~500質量部、及び
(E)揮発性溶剤:(A)、(B)成分の合計100質量部に対して10~300質量部
を含有する熱伝導性シリコーン組成物。
〔2〕
(B)成分が、下記一般式(1)で表される片末端加水分解性オルガノポリシロキサンからなるシリコーンオイル(B-1)を含み、(B)成分の配合量が、(A)、(B)成分の合計量の10~90質量%となる量である〔1〕に記載の熱伝導性シリコーン組成物。
〔3〕
(A)成分が、下記(F)成分と(G)成分とのシリコーンゲル架橋物を含むものである〔1〕又は〔2〕に記載の熱伝導性シリコーン組成物。
(F)下記平均組成式(2)
R3 bR4 cSiO(4-b-c)/2 (2)
(式中、R3はアルケニル基を表し、R4は脂肪族不飽和結合を有しない非置換又は置換の1価炭化水素基を表し、bは0.0001~0.2の数であり、cは1.7~2.2の数であり、但しb+cは1.9~2.4を満たす数である。)
で表されるケイ素原子に結合したアルケニル基を1分子中に少なくとも1個有するオルガノポリシロキサン、
(G)分子鎖非末端にケイ素原子に結合した水素原子を1分子中に少なくとも4個有し、下記式(3)
0.1<α/β (3)
(式中、αは分子鎖非末端のケイ素原子に結合した水素原子の数を表し、βは(G)成分中の全ケイ素原子数を表す。)
を満たすオルガノハイドロジェンポリシロキサン。
〔4〕
(B)成分が、更に(B-2)25℃における動粘度が10~500,000mm2/sである無官能性液状シリコーンオイルを、(B)成分中10~70質量%含有する〔1〕~〔3〕のいずれかに記載の熱伝導性シリコーン組成物。
〔5〕
(E)成分が、沸点80~360℃のイソパラフィン系溶剤である〔1〕~〔4〕のいずれかに記載の熱伝導性シリコーン組成物。
〔6〕
(A)シリコーンゲル架橋物、
(B)脂肪族不飽和結合及びSiH基をそれぞれ含有せず、下記(C)、(D)成分の表面処理剤としてのシリコーンオイル、
(C)下記(C-1)~(C-3)を含むアルミニウム粉末:(A)、(B)成分の合計100質量部に対して800~2,000質量部、
(C-1)平均粒径が40μm以上100μm以下であるアルミニウム粉末:(C)成分中30~70質量%となる量、
(C-2)平均粒径が6μm以上40μm未満であるアルミニウム粉末:(C)成分中10~60質量%となる量、
(C-3)平均粒径が0.4μm以上6μm未満であるアルミニウム粉末:(C)成分中10~60質量%となる量、
(D)平均粒径が0.1~10μmである酸化亜鉛粉末:(A)、(B)成分の合計100質量部に対して50~500質量部、及び
(E)揮発性溶剤:(A)、(B)成分の合計100質量部に対して10~300質量部
を混合する工程を有する熱伝導性シリコーン組成物の製造方法。
[(A)成分]
(A)成分のシリコーンゲル架橋物は、本発明の熱伝導性シリコーン組成物のマトリックスとして使用される。(A)成分は、下記(F)成分と(G)成分を(H)成分の存在下でハイドロシリル化反応(付加反応)させることによって得られるものが好ましい。
(F)下記平均組成式(2)
R3 bR4 cSiO(4-b-c)/2 (2)
(式中、R3はアルケニル基を表し、R4は脂肪族不飽和結合を有しない非置換又は置換の1価炭化水素基を表し、bは0.0001~0.2の数であり、cは1.7~2.2の数であり、但しb+cは1.9~2.4を満たす数である。)
で表されるケイ素原子に結合したアルケニル基を1分子中に少なくとも1個有するオルガノポリシロキサン、
(G)分子鎖非末端にケイ素原子に結合した水素原子を1分子中に少なくとも4個有し、下記式(3)
0.1<α/β (3)
(式中、αは分子鎖非末端のケイ素原子に結合した水素原子の数を表し、βは(G)成分中の全ケイ素原子数を表す。)
を満たすオルガノハイドロジェンポリシロキサン、
(H)白金系触媒。
(F)成分は、(A)成分の主剤となる成分である。(F)成分は、上記平均組成式(2)で表される1分子中にケイ素原子に結合したアルケニル基(以下、「ケイ素原子結合アルケニル基」という)を少なくとも1個有するオルガノポリシロキサンである。前記アルケニル基は、1分子中に、少なくとも2個有することが好ましく、2~50個有することがより好ましく、2~20個有することが特に好ましい。これらのアルケニル基は、分子鎖末端のケイ素原子に結合していても、分子鎖非末端(即ち、分子鎖両末端以外)のケイ素原子に結合していても、あるいはそれらの組み合わせであってもよい。
R4は、通常、炭素数が1~10、好ましくは1~6の脂肪族不飽和結合を有しない非置換又は置換の1価炭化水素基を表す。その具体例としては、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、tert-ブチル基、ペンチル基、ヘキシル基、シクロヘキシル基、オクチル基、デシル基等のアルキル基;フェニル基、トリル基等のアリール基;ベンジル基、フェニルエチル基等のアラルキル基;これらの基の水素原子の一部又は全部が、フッ素、塩素等のハロゲン原子で置換されたクロロメチル基、3,3,3-トリフルオロプロピル基等が挙げられるが、合成の容易さ等の観点から、メチル基、フェニル基、3,3,3-トリフルオロプロピル基が好ましい。
で表されるものが挙げられる。
(G)成分は、上記(F)成分と反応して、架橋剤として作用するものである。(G)成分は、分子鎖非末端にケイ素原子に結合した水素原子(即ち、SiH基であり、以下、「ケイ素原子結合水素原子」という)が1分子中に3個以下だと十分な耐ズレ性が発揮できないため、少なくとも4個有していることが必要であり、且つ、下記式(3)
0.1<α/β (3)
(式中、αは分子鎖非末端のケイ素原子に結合した水素原子の数を表し、βは(G)成分中の全ケイ素原子数を表す。)
を満たすオルガノハイドロジェンポリシロキサンである。
上記α/βの範囲が0.1以下と小さい場合、本組成物の耐ズレ性が悪くなることから、0.1<α/βであることも同時に必要である。この場合、α/βは好ましくは0.11以上、特に0.12以上であり、その上限は特に制限されないが、0.95以下、特に0.90以下であることが好ましい。
R6 eHfSiO(4-e-f)/2 (5)
(式中、R6は脂肪族不飽和結合を有しない非置換又は置換の1価炭化水素基を表し、eは0.7~2.2の数であり、fは0.001~0.5の数であり、但しe+fは0.8~2.5を満たす数である。)
(G)成分のオルガノハイドロジェンポリシロキサンは、1種単独で用いても2種以上を併用してもよい。
(H)成分は、前記(F)成分中のケイ素原子結合アルケニル基と前記(G)成分中のケイ素原子結合水素原子との付加反応を促進させるための成分である。(H)成分は白金系触媒であり、具体的には白金及び/又は白金系化合物である。
この白金及び白金系化合物としては従来公知のものを使用することができ、具体的には、例えば、白金ブラック;塩化白金酸;塩化白金酸のアルコール変性物;塩化白金酸とオレフィンアルデヒド、ビニルシロキサン、アセチレンアルコール類等の錯体等が挙げられる。
(H)成分の白金系触媒は、1種単独で用いても2種以上を併用してもよい。
本発明の(A)成分を得る場合には、上記(F)、(G)、(H)成分以外に、反応制御剤を使用してもよい。該反応制御剤は、付加硬化型シリコーン組成物に使用される従来公知の反応制御剤を使用することができる。例えば、アセチレンアルコール類(例えば、1-エチニル-1-シクロヘキサノール、3,5-ジメチル-1-ヘキシン-3-オール)等のアセチレン化合物、トリブチルアミン、テトラメチルエチレンジアミン、ベンゾトリアゾール等の各種窒素化合物、トリフェニルホスフィン等の有機リン化合物、オキシム化合物、有機クロロ化合物等が挙げられる。
(B)成分は、上記(F)、(G)成分の架橋に関与しない成分であり、従って脂肪族不飽和結合及びSiH基を含まないシリコーンオイルで、後述する(C)、(D)成分の表面処理剤として用いられるものであり、特に、下記一般式(1)で表される片末端3官能の加水分解性オルガノポリシロキサン(B-1)であることが好ましい。
(B-1)成分である一般式(1)のオルガノポリシロキサンは、(C)、(D)成分の熱伝導性充填剤の表面を処理するために用いるものであるが、粉末の高充填化を補助するばかりでなく、粉末表面を覆うことにより粉末同士の凝集を起こり難くし、高温下でもその効果は持続するため、本発明の熱伝導性シリコーン組成物の耐熱性を向上させる働きがある。
R2は、互いに独立に、炭素数1~18、好ましくは1~14の脂肪族不飽和結合を有しない非置換又は置換の1価炭化水素基である。その具体例としては、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、tert-ブチル基、ペンチル基、ネオペンチル基、へキシル基、シクロヘキシル基、オクチル基、ノニル基、デシル基等のアルキル基;フェニル基、トリル基、キシリル基、ナフチル基等のアリール基;ベンジル基、フェニルエチル基、フェニルプロピル基等のアラルキル基;これらの基の水素原子の一部又は全部が、フッ素、塩素等のハロゲン原子で置換された3,3,3-トリフルオロプロピル基等が挙げられ、好ましくはアルキル基、アリール基、3,3,3-トリフルオロプロピル基であり、より好ましくはメチル基、フェニル基、3,3,3-トリフルオロプロピル基である。
aは5~120の整数であり、好ましくは10~90の整数である。
(B-1)成分のシリコーンオイルは、1種単独で用いても2種以上を併用してもよい。
(B-2)成分の無官能性液状シリコーンオイルは、25℃における動粘度が10~500,000mm2/s、好ましくは30~10,000mm2/sのオルガノポリシロキサンである。該オルガノポリシロキサンの動粘度が上記下限値より低いと得られる熱伝導性シリコーン組成物がオイルブリードし易くなる。また、上記上限値より大きいと、得られる組成物の粘度が高くなりすぎて取り扱い性の悪いものになる。
R7 gSiO(4-g)/2 (6)
上記式(6)において、R7は、独立に、炭素数1~18、好ましくは1~14の脂肪族不飽和結合を有しない非置換又は置換の1価炭化水素基である。その具体例としては、メチル基、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、tert-ブチル基、ペンチル基、ネオペンチル基、へキシル基、シクロヘキシル基、オクチル基、ノニル基、デシル基等のアルキル基;フェニル基、トリル基、キシリル基、ナフチル基等のアリール基;ベンジル基、フェニルエチル基、フェニルプロピル基等のアラルキル基;これらの基の水素原子の一部又は全部が、フッ素、塩素等のハロゲン原子で置換された3,3,3-トリフルオロプロピル基等が挙げられ、好ましくはアルキル基、アリール基、3,3,3-トリフルオロプロピル基であり、より好ましくはメチル基、フェニル基、3,3,3-トリフルオロプロピル基である。
上記式(6)において、gは1.8~2.2の範囲、特には1.9~2.1の範囲にある数である。gが上記範囲内にあることにより、得られる熱伝導性シリコーン組成物は要求される良好な動粘度を有することができる。
(B-2)成分の無官能性液状シリコーンオイルは、1種単独で用いても2種以上を併用してもよい。
(C)成分のアルミニウム粉末は、本発明の熱伝導性シリコーン組成物に熱伝導性を付与するためのものである
(C-1)成分の配合量は、(C)成分:アルミニウム粉末の合計質量中、30~70質量%、好ましくは40~60質量%である。(C-1)成分の配合量が上記下限値より少ないと、熱伝導性シリコーン組成物の熱伝導率が低くなってしまう。また、(C-1)成分の配合量が上記上限値より多いと、(C-2)成分及び(C-3)成分との間で最密充填構造をとることができず、熱伝導性シリコーン組成物の粘度が上昇してしまう。
(C-2)成分の配合量は、(C)成分:アルミニウム粉末の合計質量中、10~60質量%、好ましくは10~40質量%、更に好ましくは15~35質量%である。(C-2)成分の配合量が上記下限値より少ないと(C-3)成分との間で最密充填構造が得られず、熱伝導性シリコーン組成物の粘度が上昇してしまう。また、(C-2)成分の配合量が上記上限値より多くても(C-1)成分との間で最密充填構造が得られず、熱伝導性シリコーン組成物の粘度が上昇してしまう。
(C-3)成分の配合量は、(C)成分:アルミニウム粉末の合計質量中、10~60質量%、好ましくは10~40質量%、更に好ましくは15~35質量%である。(C-3)成分の配合量が上記下限値より少ないと最密充填構造をとることができないため、熱伝導性シリコーン組成物の粘度が上昇してしまう。また(C-3)成分の配合量が上記上限値より多くても(C-2)成分との間で最密充填構造が得られず、熱伝導性シリコーン組成物の粘度が上昇してしまう。
(D)成分の酸化亜鉛粉末は、平均粒径が0.1~10μm、好ましくは1~4μmのものであり、酸化亜鉛粉末の形状は特に制限されるものでなく、例えば球状、不定形状等が挙げられる。
酸化亜鉛粉末の平均粒径が、0.1μmより小さいと得られるシリコーン組成物の粘度が高くなり、取り扱い性が悪くなるし、また10μmより大きいと、得られるシリコーン組成物が不均一となる。
(E)成分の揮発性溶剤としては、(A)成分及び(B)成分を溶解あるいは分散できれば如何なる溶剤でもよいが、例えば、トルエン、キシレン、アセトン、メチルエチルケトン、シクロヘキサン、n-ヘキサン、n-ヘプタン、ブタノール、IPA(イソプロピルアルコール)、イソパラフィンなどが挙げられ、安全面、健康面及び印刷での作業性の点からイソパラフィン系の溶剤が好ましい。
(E)成分を含有させた後の粘度は10~300Pa・sの範囲であることが好ましく、より好ましくは30~250Pa・sであり、更に好ましくは30~200Pa・sである。10Pa・sより低いと熱伝導性充填剤が沈降し易くなるし、300Pa・sより高いと取り扱いが悪くなるためである。なお、本発明において、粘度は回転粘度計による25℃における値である(以下、同じ)。
(C)、(D)成分の平均粒径測定は、レーザー回折・散乱法によるもので、日機装(株)製の粒度分析計であるマイクロトラックMT3300EXにより測定した体積基準の累積平均径である。
熱伝導性シリコーン組成物((E)成分添加前及び添加後)の熱伝導率は、ISO 22007-2準拠のホットディスク法において、京都電子工業(株)製のTPS-2500Sにより、いずれも25℃において測定した。
熱伝導性シリコーン組成物((E)成分添加前及び添加後)の粘度は、回転粘度計による25℃における値であり、25℃にて(株)マルコム製のマルコム粘度計(タイプPC-10AA)にて測定を行った。
3cm角に切り抜かれた厚さ120μmのメタルスクリーン用のSUS板を用意し、スキージを用いて製造した熱伝導性シリコーン組成物(グリース)をヒートシンクに塗布した。
(評価結果)
○;一面均一に塗布できた。
△;ややグリース表面にムラが生じた。
×;スキージにグリースが巻き付いて全く塗布できない。
0.3mmのスペーサーを設け、2枚のスライドガラス板の間に、直径1.5cmの円状になるように熱伝導性シリコーン組成物を挟み込み、この試験片を地面に対し90度傾くように、-40℃と125℃(各30分)を交互に繰り返すようにセットされたエスペック(株)製の熱衝撃試験機(型番:TSE-11-A)の中に配置し、500サイクル試験を行った。500サイクル後、熱伝導性シリコーン組成物が元の場所からどのくらいズレたかを測定した。
<基準>
1mm以下であれば耐ズレ性は優れていると言える。
上記500サイクル後の熱伝導性シリコーン組成物の状態を観察した。該組成物中、ボイドやひび割れがない状態を○、ボイドやひび割れがあった状態を×と評価した。
表1~3に示すように各成分をプラネタリーミキサーに仕込み、以下の手順にて熱伝導性シリコーン組成物を調製した。
即ち、(B)、(C)、(D)、(F)成分をプラネタリーミキサーに投入し、まず室温にて10分間撹拌した。その後、(G)、(H)成分を投入してから、170℃に温度を上げ、そのまま2時間加熱混合して、(F)、(G)成分によるハイドロシリル化反応を行わせて(A)成分のシリコーンゲル架橋物を調製した。これを40℃以下に冷却後、(E)成分を投入し、組成物を得た。得られた組成物を用いて上述した各種試験を行った。結果を表1~3に併記する。
(C-1-1)アルミニウム粉末(平均粒径:61μm)
(C-1-2)アルミニウム粉末(平均粒径:46μm)
(C-2-1)アルミニウム粉末(平均粒径:10μm)
(C-3-1)アルミニウム粉末(平均粒径:1.1μm)
(C-4-1)アルミニウム粉末(平均粒径:0.2μm)<比較例用>
(D-1)酸化亜鉛粉末(平均粒径:1.0μm)
(E-1)IPソルベント2028(イソパラフィン系溶剤、出光興産(株)商品名、沸点;210~254℃)
(F-1)
両末端にビニル基を有する直鎖状の動粘度600mm2/sのジメチルポリシロキサン。
(F-2)
両末端にビニル基を有する直鎖状の動粘度30,000mm2/sのジメチルポリシロキサン。
(H-1)
白金-ジビニルテトラメチルジシロキサン錯体を上記(F-1)と同じジメチルポリシロキサンに溶解した溶液(白金原子含有量:1質量%)。
(C)成分中の「」内の数字は、(C)成分中の質量%を示す(以下、同じ)。
*(F)成分中のケイ素原子結合アルケニル基1個に対する(G)成分のケイ素原子結合水素原子の個数を便宜的にH/Viと標記する(以下、同じ)。
Claims (6)
- (A)シリコーンゲル架橋物、
(B)脂肪族不飽和結合及びSiH基をそれぞれ含有せず、下記(C)、(D)成分の表面処理剤としてのシリコーンオイル、
(C)下記(C-1)~(C-3)を含むアルミニウム粉末:(A)、(B)成分の合計100質量部に対して800~2,000質量部、
(C-1)平均粒径が40μm以上100μm以下であるアルミニウム粉末:(C)成分中30~70質量%となる量、
(C-2)平均粒径が6μm以上40μm未満であるアルミニウム粉末:(C)成分中10~60質量%となる量、
(C-3)平均粒径が0.4μm以上6μm未満であるアルミニウム粉末:(C)成分中10~60質量%となる量、
(D)平均粒径が0.1~10μmである酸化亜鉛粉末:(A)、(B)成分の合計100質量部に対して50~500質量部、及び
(E)揮発性溶剤:(A)、(B)成分の合計100質量部に対して10~300質量部
を含有する熱伝導性シリコーン組成物。 - (A)成分が、下記(F)成分と(G)成分とのシリコーンゲル架橋物を含むものである請求項1又は2に記載の熱伝導性シリコーン組成物。
(F)下記平均組成式(2)
R3 bR4 cSiO(4-b-c)/2 (2)
(式中、R3はアルケニル基を表し、R4は脂肪族不飽和結合を有しない非置換又は置換の1価炭化水素基を表し、bは0.0001~0.2の数であり、cは1.7~2.2の数であり、但しb+cは1.9~2.4を満たす数である。)
で表されるケイ素原子に結合したアルケニル基を1分子中に少なくとも1個有するオルガノポリシロキサン、
(G)分子鎖非末端にケイ素原子に結合した水素原子を1分子中に少なくとも4個有し、下記式(3)
0.1<α/β (3)
(式中、αは分子鎖非末端のケイ素原子に結合した水素原子の数を表し、βは(G)成分中の全ケイ素原子数を表す。)
を満たすオルガノハイドロジェンポリシロキサン。 - (B)成分が、更に(B-2)25℃における動粘度が10~500,000mm2/sである無官能性液状シリコーンオイルを、(B)成分中10~70質量%含有する請求項1~3のいずれか1項に記載の熱伝導性シリコーン組成物。
- (E)成分が、沸点80~360℃のイソパラフィン系溶剤である請求項1~4のいずれか1項に記載の熱伝導性シリコーン組成物。
- (A)シリコーンゲル架橋物、
(B)脂肪族不飽和結合及びSiH基をそれぞれ含有せず、下記(C)、(D)成分の表面処理剤としてのシリコーンオイル、
(C)下記(C-1)~(C-3)を含むアルミニウム粉末:(A)、(B)成分の合計100質量部に対して800~2,000質量部、
(C-1)平均粒径が40μm以上100μm以下であるアルミニウム粉末:(C)成分中30~70質量%となる量、
(C-2)平均粒径が6μm以上40μm未満であるアルミニウム粉末:(C)成分中10~60質量%となる量、
(C-3)平均粒径が0.4μm以上6μm未満であるアルミニウム粉末:(C)成分中10~60質量%となる量、
(D)平均粒径が0.1~10μmである酸化亜鉛粉末:(A)、(B)成分の合計100質量部に対して50~500質量部、及び
(E)揮発性溶剤:(A)、(B)成分の合計100質量部に対して10~300質量部
を混合する工程を有する熱伝導性シリコーン組成物の製造方法。
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WO2023143728A1 (de) | 2022-01-28 | 2023-08-03 | Wacker Chemie Ag | Aluminiumhaltige wärmeleitpasten |
TWI849624B (zh) | 2022-01-28 | 2024-07-21 | 德商瓦克化學公司 | 含鋁導熱膏、用於製備彼之方法以及彼之應用 |
TWI850903B (zh) | 2022-01-28 | 2024-08-01 | 德商瓦克化學公司 | 可交聯導熱矽酮組合物、生產彼之方法、以及其應用 |
WO2023149175A1 (ja) * | 2022-02-02 | 2023-08-10 | 信越化学工業株式会社 | 熱伝導性シリコーン組成物及びその製造方法 |
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US20220380548A1 (en) | 2022-12-01 |
KR20220089701A (ko) | 2022-06-28 |
CN114641538A (zh) | 2022-06-17 |
JP7276493B2 (ja) | 2023-05-18 |
TW202128948A (zh) | 2021-08-01 |
JPWO2021079714A1 (ja) | 2021-04-29 |
CN114641538B (zh) | 2023-10-31 |
EP4050068A4 (en) | 2023-12-27 |
EP4050068A1 (en) | 2022-08-31 |
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