WO2018074247A1 - 熱伝導性シリコーン組成物 - Google Patents
熱伝導性シリコーン組成物 Download PDFInfo
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- WO2018074247A1 WO2018074247A1 PCT/JP2017/036305 JP2017036305W WO2018074247A1 WO 2018074247 A1 WO2018074247 A1 WO 2018074247A1 JP 2017036305 W JP2017036305 W JP 2017036305W WO 2018074247 A1 WO2018074247 A1 WO 2018074247A1
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- 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
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- 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
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- 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
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- 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
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- 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
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Definitions
- the present invention generally relates to a heat transfer material that can be interposed at an interface between a heat boundary surface of a heat-generating electronic component and a heat dissipation member such as a heat sink or a circuit board for cooling the electronic component by heat conduction.
- LSI chips such as CPUs, driver ICs, and memories used in electronic devices such as personal computers, digital video disks, and mobile phones are becoming more and more themselves as performance, speed, size, and integration increase. Heat is generated, and the temperature rise of the chip due to the heat causes malfunction and destruction of the chip. Therefore, many heat dissipating methods for suppressing the temperature rise of the chip during operation and heat dissipating members used therefor have been proposed.
- a heat sink using a metal plate having high thermal conductivity such as aluminum or copper is used in order to suppress a temperature rise of a chip during operation.
- the heat sink conducts heat generated by the chip and releases the heat from the surface due to a temperature difference from the outside air.
- the heat sink In order to efficiently transfer the heat generated from the chip to the heat sink, the heat sink needs to be in close contact with the chip, but because there is a difference in the height of each chip and tolerance due to assembly processing, a flexible sheet or grease is used. It is interposed between the chip and the heat sink, and heat conduction from the chip to the heat sink is realized through this sheet or grease.
- the sheet is easier to handle than grease, and a heat conductive sheet (heat conductive silicone rubber sheet) formed of a heat conductive silicone rubber or the like is used in various fields.
- the heat conductive sheet is often used particularly when there is a certain amount of space between the heat generating element and a cooling part such as a heat sink or a housing. In many cases, it is necessary to ensure an electrically insulated state between the heat generating element and the heat sink or the housing, and the heat conductive sheet is often required to have an insulating property. That is, metal particles such as aluminum, copper, and silver cannot be used as the heat conductive filler, and insulative heat conductive fillers such as aluminum hydroxide and aluminum oxide are often used.
- thermal conductivity of the thermally conductive silicone composition using these as a thermally conductive filler is lowered.
- the amount of heat generated by heating elements has been increasing, and the thermal conductivity required for thermally conductive sheets has also increased, making it impossible to use aluminum hydroxide or aluminum oxide as a thermally conductive filler. ing.
- the present inventors have found that the heat conductive filler accounts for 60 to 85% by volume, and 40-60% by volume of the heat conductive filler has an average particle size of 50 ⁇ m or more. It has been found that by using aluminum nitride which is a heat-conductive silicone composition to be a cured product having high thermal conductivity, the present invention has been made.
- a thermally conductive silicone composition comprising an organopolysiloxane as a base polymer and containing (B) a thermally conductive filler, wherein (B) the thermally conductive filler is 60 to 85 in the thermally conductive silicone composition.
- a thermally conductive silicone composition wherein 40% by volume to 40% by volume of the thermally conductive filler is aluminum nitride having an average particle size of 50 ⁇ m or more.
- the volume ratio of aluminum nitride having an average particle size of 50 ⁇ m or more and less than 70 ⁇ m is 0.5 to 0.6 with respect to the total amount of aluminum nitride as the heat conductive filler, and the average particle size of aluminum nitride of 70 to 90 ⁇ m
- B-III Aluminum oxide having an average particle diameter of 5 to 15 ⁇ m: 650 to 800 parts by mass
- Aluminum hydroxide The heat conductive silicone composition according to [1], comprising 1,300 to 1,700 parts by mass.
- the component (BI) is non-sintered crushed aluminum nitride having an average particle size of 50 ⁇ m or more and less than 70 ⁇ m, and the component (BI) is a non-sintered crushed aluminum nitride having an average particle size of 70 to 90 ⁇ m.
- sintered spherical aluminum nitride having an average particle size of 70 to 90 ⁇ m the component (B-III) is spherical aluminum oxide having an average particle size of 5 to 15 ⁇ m, and the component (B-IV) has an average particle size of 0
- the heat conductive silicone composition according to [6] which is crushed aluminum oxide having a particle size of 5 ⁇ m or more and less than 5 ⁇ m or aluminum hydroxide having an average particle size of 0.5 ⁇ m or more and less than 5 ⁇ m. [8].
- the heat conductive silicone composition in any one.
- R 1 is an alkyl group having 6 to 15 carbon atoms independently
- R 2 is a monovalent hydrocarbon radical unsubstituted or substituted with 1 to 8 carbon atoms independently
- R 3 is independently And an alkyl group having 1 to 6 carbon atoms, a is an integer of 1 to 3, b is an integer of 0 to 2, provided that a + b is an integer of 1 to 3.
- R 4 is independently an alkyl group having 1 to
- cured material of the heat conductive silicone composition in any one of [1]-[8] whose heat conductivity is 8 W / mK or more. [10]. Hardened
- Aluminum hydroxide A method for producing a thermally conductive silicone composition according to [1] or [6], comprising a step of mixing 1,300 to 1,700 parts by mass.
- thermally conductive silicone composition of the present invention a thermally conductive silicone composition that becomes a cured product having high thermal conductivity can be obtained.
- the present invention relates to a thermally conductive silicone composition
- a thermally conductive silicone composition comprising an organopolysiloxane as a base polymer and including a thermally conductive filler, wherein the thermally conductive filler is 60 to 85% by volume in the thermally conductive silicone composition
- This is a heat conductive silicone composition in which 40 to 60% by volume of the heat conductive filler is aluminum nitride having an average particle size of 50 ⁇ m or more.
- the type of the base polymer organopolysiloxane used in the present invention is not particularly limited, but usually the main chain portion is basically composed of repeating diorganosiloxane units, and this has a molecular structure. May include a branched structure in a part thereof, or may be a ring. From the viewpoint of physical properties such as mechanical strength of the cured product, linear diorganopolysiloxane is preferable. Note that the end of the organopolysiloxane may be blocked with a triorganosilyl group or may be blocked with a diorganohydroxysilyl group. These organopolysiloxanes may be used alone or in combination of two or more having different kinematic viscosities.
- monohydric hydrocarbon group which may interpose an oxygen atom can be illustrated, specifically, a methyl group, an ethyl group, Propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, neopentyl, hexyl, heptyl, octyl, nonyl, decyl, dodecyl and other alkyl groups, cyclopentyl, cyclohexyl Cycloalkyl groups such as cycloheptyl group, vinyl groups, allyl groups, propenyl groups, isopropenyl groups, alkenyl groups such as butenyl groups, hexenyl groups, cyclohexenyl groups, phenyl groups, tolyl groups, xyly
- carbon such as methyl group, ethyl group, propyl group, chloromethyl group, bromoethyl group, 3,3,3-trifluoropropyl group, cyanoethyl group, etc.
- Unsubstituted or substituted alkyl group of children having 1-3 a vinyl group, a lower alkenyl group such as allyl group and a phenyl group, chlorophenyl group, an unsubstituted or substituted phenyl groups such as fluorophenyl group.
- all of the organic groups bonded to the silicon atom may be the same or different.
- Kinematic viscosity at 25 ° C. of the organopolysiloxane is preferably 10 ⁇ 30,000mm 2 / s, more preferably 50 ⁇ 1,000mm 2 / s. If an organopolysiloxane having a high kinematic viscosity is used, the fluidity of the resulting composition may be deteriorated, and it may be difficult to fill the thermally conductive filler. In the present invention, the kinematic viscosity can be measured with an Ostwald viscometer (hereinafter the same).
- the blending amount of the component (A) is preferably 3 to 30% by volume in the thermally conductive silicone composition, and more preferably 5 to 20% by volume.
- Thermally conductive fillers include nonmagnetic metals such as copper and aluminum, metal oxides such as aluminum oxide, silica, magnesia, bengara, beryllia, titania and zirconia, and metal nitrides such as aluminum nitride, silicon nitride and boron nitride.
- a material generally used as a heat conductive filler such as metal hydroxide such as magnesium hydroxide, artificial diamond, or silicon carbide, can be used.
- the particle diameter may be 0.1 to 200 ⁇ m, and may be used alone or in combination of two or more in a range that satisfies the prescribed requirements.
- the particle size of the thermally conductive filler is measured using a laser diffraction / scattering particle size distribution measuring device, for example, Microtrac MT3300EX (Nikkiso), and the average particle size is a volume-based value (volume distribution of particles).
- a laser diffraction / scattering particle size distribution measuring device for example, Microtrac MT3300EX (Nikkiso)
- the average particle size is a volume-based value (volume distribution of particles).
- the heat conductive filler 40 to 60% by volume, preferably 45 to 55% by volume, of the heat conductive filler is aluminum nitride having an average particle size of 50 ⁇ m or more.
- the average particle size of aluminum nitride is 50 ⁇ m or more, preferably 50 ⁇ m or more and 200 ⁇ m or less, and more preferably 60 ⁇ m or more and 200 ⁇ m or less.
- filling becomes difficult.
- the thermal conductivity of the composition obtained with a larger particle size becomes higher, so particles having an average particle size as large as possible are used.
- the average particle size exceeds 200 ⁇ m, the fluidity when added to the composition may be impaired. If it is the said average particle diameter, it may be a crushed shape or a spherical shape, and a crushed shape is preferable. In addition, a well-known thing can be used for a crushed shape and a spherical thing.
- Aluminum nitride is roughly classified into sintered bodies and non-sintered bodies. Since the sintered body is a spherical particle, the filling property to the organopolysiloxane is better than that of a non-sintered body that is crushed. On the other hand, when sintering, rare earth element oxide such as yttria is added as a sintering aid by several percent, so the phase of aluminum nitride and the phase of sintering aid are mixed, and in terms of thermal conductivity Inferior to non-sintered body. Furthermore, since the sintering process is performed, it becomes very expensive. Therefore, non-sintered aluminum nitride is preferred for use as a thermally conductive filler.
- the volume ratio of aluminum nitride having an average particle size of 50 ⁇ m or more and less than 70 ⁇ m is preferably 0.5 to 0.6, more preferably 0.52 to 0.62, with respect to the total amount of aluminum nitride as the heat conductive filler. .
- the volume ratio of aluminum nitride having an average particle diameter of 70 to 90 ⁇ m is preferably 0.4 to 0.5, and more preferably 0.42 to 0.48.
- Aluminum oxide (alumina) may be spherical or non-spherical.
- Non-spherical aluminum oxide includes crushed and round shapes, and is less expensive than spherical aluminum oxide. Therefore, non-spherical aluminum oxide is more preferable from the viewpoint of imparting price competitiveness to the resulting composition.
- the thermally conductive filler is a thermally conductive filler having an average particle size of 5 ⁇ m or less.
- the heat conductive filler having an average particle size of 5 ⁇ m or less is preferably aluminum oxide, and more preferably non-spherical aluminum oxide.
- the blending amount of the component (B) is 60 to 85% by volume in the thermally conductive silicone composition, and preferably 75 to 85% by volume. If the blending amount is too small, sufficient thermal conductivity cannot be obtained, and if it is too large, blending itself becomes difficult. For example, it is appropriately selected in the range of 1,000 to 8,000 parts by weight and 3,000 to 6,000 parts by weight with respect to 100 parts by weight of component (A).
- More specific examples of the combination of the component (A) and the component (B) include the following.
- B-III Aluminum oxide having an average particle diameter of 5 to 15 ⁇ m: 650 to 800 parts by mass
- Aluminum hydroxide a thermally conductive silicone composition containing 1,300 to 1,700 parts by mass.
- non-sintered crushed aluminum nitride having an average particle size of 70 to 90 ⁇ m is preferable, and as the component (B-IV), crushed aluminum oxide having an average particle size of 0.5 ⁇ m or more and less than 5 ⁇ m. Is preferred. In this case, the amount of component (B-IV) is more preferably 1,500 to 1,700 parts by mass.
- the component (A) is preferably a component (AI) or (A-II) described later.
- the heat conductive filler is hydrophobized during preparation of the composition to improve wettability with the organopolysiloxane (A), and (B) heat conductive filling.
- a surface treatment agent (C) can be blended.
- the component (C) the following components (C-1) and (C-2) are preferable, and one or more selected from these can be used in combination.
- (C-1) Alkoxysilane compound represented by the following general formula (1) R 1 a R 2 b Si (OR 3 ) 4-ab (1) Wherein R 1 is independently an alkyl group having 6 to 15 carbon atoms, R 2 is independently an unsubstituted or substituted monovalent hydrocarbon group having 1 to 8 carbon atoms, and R 3 is independently And an alkyl group having 1 to 6 carbon atoms, a is an integer of 1 to 3, b is an integer of 0 to 2, provided that a + b is an integer of 1 to 3.)
- examples of the alkyl group represented by R 1 include a hexyl group, an octyl group, a nonyl group, a decyl group, a dodecyl group, and a tetradecyl group.
- the number of carbon atoms of the alkyl group represented by R 1 satisfies the range of 6 to 15, the wettability of the component (C) is sufficiently improved, the handleability is good, and the low temperature characteristics of the resulting composition are good. It becomes.
- Examples of the unsubstituted or substituted monovalent hydrocarbon group having 1 to 8 carbon atoms represented by R 2 include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, and a tert-butyl group.
- One kind alone or two or more kinds can be appropriately selected and used. .
- those having 1 to 6 carbon atoms are preferable, and those having 1 to 3 carbon atoms such as methyl group, ethyl group, propyl group, chloromethyl group, bromoethyl group, 3,3,3-trifluoropropyl group, cyanoethyl group and the like.
- unsubstituted or substituted alkyl groups and unsubstituted or substituted phenyl groups such as phenyl group, chlorophenyl group, and fluorophenyl group are preferred.
- Preferable specific examples of the component (C-1) include the following. C 6 H 13 Si (OCH 3 ) 3 C 10 H 21 Si (OCH 3 ) 3 C 12 H 25 Si (OCH 3 ) 3 C 12 H 25 Si (OC 2 H 5 ) 3 C 10 H 21 Si (CH 3 ) (OCH 3 ) 2 C 10 H 21 Si (C 6 H 5 ) (OCH 3 ) 2 C 10 H 21 Si (CH 3 ) (OC 2 H 5 ) 2 C 10 H 21 Si (CH ⁇ CH 2 ) (OCH 3 ) 2 C 10 H 21 Si (CH 2 CH 2 CF 3 ) (OCH 3 ) 2
- C-2 Dimethylpolysiloxane in which one molecular chain end represented by the following general formula (2) is blocked with a trialkoxy group (In the formula, R 4 is independently an alkyl group having 1 to 6 carbon atoms, and c is an integer of 5 to 100.)
- examples of the alkyl group represented by R 4 include those having 1 to 6 carbon atoms among the alkyl groups represented by R 2 in the general formula (1).
- component (C-2) include the following.
- the component (C) is preferably 10 to 160 parts by mass, more preferably 50 to 160 parts by mass with respect to 100 parts by mass of the component (A).
- the type of the (A) organopolysiloxane that is the base polymer used in the present invention is not particularly limited, but when it is set as a curable thermally conductive silicone composition, the following three forms are mentioned, As the base polymer organopolysiloxane (A), the organopolysiloxanes (AI) to (A-III) described later are used, respectively, and the above-mentioned thermally conductive filler (B) is blended. be able to.
- each composition is demonstrated concretely.
- Addition reaction curable heat conductive silicone composition When the composition is an addition reaction curable heat conductive silicone composition that is cured by a hydrosilylation reaction, as the above-mentioned base polymer organopolysiloxane (A) It is preferable that the component (AI) shown below is used, the heat conductive filler (B) is blended, and the component shown below is further contained. Preferred amounts are also shown below.
- Organopolysiloxane having at least two alkenyl groups in the molecule
- the main chain portion is basically composed of repeating diorganosiloxane units.
- the part may contain a branched structure or may be a cyclic body, but a linear diorganopolysiloxane is preferred from the viewpoint of physical properties such as mechanical strength of the cured product.
- alkenyl group bonded to the silicon atom examples include those having usually about 2 to 8 carbon atoms such as vinyl group, allyl group, propenyl group, isopropenyl group, butenyl group, hexenyl group and cyclohexenyl group. Of these, lower alkenyl groups such as vinyl group and allyl group are preferable, and vinyl group is particularly preferable.
- the alkenyl group bonded to the silicon atom may be present at either the molecular chain terminal or the molecular chain non-terminal (that is, the molecular chain side chain) in the organopolysiloxane molecule of the component (AI), or although it may exist in both of these, it is preferable that it exists at both molecular chain both ends.
- the organic group bonded to the silicon atom other than the alkenyl group is an unsubstituted or substituted monovalent hydrocarbon group which may intervene an oxygen atom, for example, a methyl group, an ethyl group, a propyl group, an isopropyl group.
- Alkyl group such as butyl group, isobutyl group, tert-butyl group, pentyl group, neopentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, dodecyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group, etc.
- Aryl groups such as cycloalkyl group, phenyl group, tolyl group, xylyl group, naphthyl group, biphenylyl group, aralkyl groups such as benzyl group, phenylethyl group, phenylpropyl group, methylbenzyl group, and carbon atoms in these groups
- halogens such as fluorine, chlorine, bromine
- a group substituted with a cyano group such as a chloromethyl group, 2-bromoethyl group, 3-chloropropyl group, 3,3,3-trifluoropropyl group, chlorophenyl group, fluorophenyl group, cyanoethyl group, 3 , 3,4,4,5,5,6,6,6-nonafluorohexyl group, alkoxy groups such as methoxy group, ethoxy group, propoxy group and the like.
- To 10 and particularly representative are those having 1 to 6 carbon atoms, preferably methyl, ethyl, propyl, chloromethyl, bromoethyl, 3,3,3-trifluoropropyl
- An unsubstituted or substituted alkyl group having 1 to 3 carbon atoms such as a cyanoethyl group, an unsubstituted or substituted phenyl group such as a phenyl group, a chlorophenyl group or a fluorophenyl group, and Shi alkoxy groups such as.
- the functional groups other than the alkenyl group bonded to the silicon atom are not limited to being the same.
- the component (B) used in the addition reaction curable heat conductive silicone composition is the above-described heat conductive filler (B).
- the compounding quantity of a component is suitably selected within the range prescribed
- Component (D) is an organohydrogenpolysiloxane having at least two hydrogen atoms directly bonded to silicon atoms, and is bonded directly to an average of 2 or more, preferably 2 to 100 silicon atoms in one molecule.
- An organohydrogenpolysiloxane having a hydrogen atom (Si—H group) is preferred, and is a component that acts as a crosslinking agent for the component (AI).
- the organohydrogenpolysiloxane as component (D) is preferably represented by the following general formula (3).
- R 5 independently represents an unsubstituted or substituted monovalent hydrocarbon group or hydrogen atom that does not contain an aliphatic unsaturated bond, provided that at least two are hydrogen atoms.
- D is an integer of 1 or more. (It is preferably an integer of 1 to 100, more preferably an integer of 2 to 50.)
- examples of the unsubstituted or substituted monovalent hydrocarbon group not containing an aliphatic unsaturated bond other than the hydrogen atom of R 5 include, for example, methyl group, ethyl group, propyl group, isopropyl group, butyl Group, isobutyl group, tert-butyl group, pentyl group, neopentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, cyclodecyl group such as cyclopentyl group, cyclohexyl group, etc.
- An aryl group such as an alkyl group, a phenyl group, a tolyl group, a xylyl group, a naphthyl group, and a biphenylyl group, an aralkyl group such as a benzyl group, a phenylethyl group, a phenylpropyl group, and a methylbenzyl group, and a carbon atom bonded to these groups
- Some or all of the hydrogen atoms are substituted with halogen atoms such as fluorine, chlorine and bromine, cyano groups, etc.
- Group for example, chloromethyl group, 2-bromoethyl group, 3-chloropropyl group, 3,3,3-trifluoropropyl group, chlorophenyl group, fluorophenyl group, cyanoethyl group, 3,3,4,4, 5,5,6,6,6-nonafluorohexyl group and the like, typical ones having 1 to 10 carbon atoms, particularly typical ones having 1 to 6 carbon atoms,
- an unsubstituted or substituted alkyl group having 1 to 3 carbon atoms such as methyl group, ethyl group, propyl group, chloromethyl group, bromoethyl group, 3,3,3-trifluoropropyl group, cyanoethyl group, and the like
- An unsubstituted or substituted phenyl group such as a phenyl group, a chlorophenyl group, and a fluorophenyl group.
- R 5 does not limit that all but the hydrogen
- R 5 is at least 2, preferably 2 to 100, more preferably 2 to 50 hydrogen atoms, and the hydrogen atom is either a molecular chain terminal or a molecular chain non-terminal (ie, molecular chain side chain). May be present in both or both.
- the amount of component (D) added is preferably such that the Si—H group derived from component (D) is 0.1 to 8 moles per mole of alkenyl group derived from component (AI). Is an amount of 0.5 to 5 mol, more preferably 1 to 4 mol.
- the amount of Si-H groups derived from the component (D) is less than 0.1 mol relative to 1 mol of the alkenyl groups derived from the component (AI)
- the cured product is not cured or the strength of the cured product is insufficient. The shape cannot be maintained, making it difficult to handle.
- it exceeds 8 mol the flexibility of the cured product is lost, and the thermal resistance may be remarkably increased.
- the platinum group metal curing catalyst of component (E) is an addition reaction catalyst for promoting the addition reaction of the alkenyl group derived from component (AI) and the Si—H group derived from component (D).
- Known catalysts can be used as the catalyst used in the reaction. Specific examples thereof include platinum group metals such as platinum (including platinum black), rhodium and palladium, H 2 PtCl 4 ⁇ nH 2 O, H 2 PtCl 6 ⁇ nH 2 O, NaHPtCl 6 ⁇ nH 2 O.
- n is an integer of 0 to 6, preferably 0 or 6
- platinum chloride chloroplatinic acid and chloroplatinate
- alcohol-modified chloroplatinic acid see US Pat. No. 3,220,972
- a complex of chloroplatinic acid and olefin see US Pat. Nos.
- platinum black platinum black
- Platinum group metals such as palladium Supported on a carrier such as aluminum oxide, silica, carbon, rhodium-olefin complex, chlorotris (triphenylphosphine) rhodium (Wilkinson catalyst), platinum chloride, chloroplatinic acid or chloroplatinate and vinyl group-containing siloxane
- a complex with a vinyl group-containing cyclic siloxane may be mentioned.
- the amount of component (D) used may be a so-called catalyst amount, and is usually about 0.1 to 2,000 ppm in terms of platinum group metal element mass relative to component (AI).
- an addition reaction control agent (F) can be used as necessary.
- the addition reaction control agent all known addition reaction control agents used in ordinary addition reaction curable silicone compositions can be used. Examples thereof include acetylene compounds such as ethynylmethylidenecarbinol, 1-ethynyl-1-hexanol, and 3-butyn-1-ol, various nitrogen compounds, organic phosphorus compounds, oxime compounds, and organic chloro compounds.
- the use amount of the addition reaction control agent is preferably 0.01 to 1 part by mass with respect to 100 parts by mass of the component (AI).
- Organic peroxide-curing heat conductive silicone composition When the present composition is an organic peroxide-curing heat conductive silicone composition that is cured by a free radical reaction with an organic peroxide, It is preferable that (A-II) shown below is used as the organopolysiloxane (A) as the base polymer, the heat conductive filler (B) is blended, and further the components shown below are contained. .
- (A-II) Organopolysiloxane having an alkenyl group bonded to at least two silicon atoms in one molecule
- (B) Thermally conductive filler: as described above
- (G) Organic peroxide
- Organopolysiloxane [(A-II) Organopolysiloxane]
- An organopolysiloxane having an alkenyl group bonded to at least two silicon atoms in one molecule is not particularly limited, but at least two alkenyl in one molecule of the component (AI) It is preferable to use the same organopolysiloxane having a group.
- the component (B) used in the organic peroxide curable thermally conductive silicone composition is the above-described thermally conductive filler (B).
- the compounding quantity of a component is suitably selected within the range prescribed
- the organic peroxide as the component (G) is an organic peroxide that decomposes under specific conditions to generate a free radical, and can be used alone or in combination of two or more.
- peroxyketals such as 1,1-di (tert-butylperoxy) cyclohexane and 2,2-di (4,4-di- (tert-butylperoxy) cyclohexyl) propane, p-menthane Hydroperoxides such as hydroperoxide, diisopropylbenzene hydroperoxide, dialkyl peroxides such as dicumyl peroxide, tert-butylcumyl peroxide, diacyl peroxides such as dibenzoyl peroxide, disuccinic acid peroxide, tert-butyl Peroxyesters such as peroxyacetate and tert-butylperoxybenzoate, and peroxydicarbonates such as diisopropylper
- peroxyketals such as 1,
- peroxyketals In particular, the use of peroxyketals, hydroperoxides, dialkyl peroxides, and peroxyesters having a relatively high decomposition temperature is preferred from the viewpoints of handleability and storage stability.
- organic peroxides may be diluted with any organic solvent, hydrocarbon, liquid paraffin, inert solid or the like.
- the compounding amount of the component (G) is preferably 0.01 to 10 parts by mass, more preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the component (A-II).
- Condensation reaction curable heat conductive silicone composition When the present composition is a condensation reaction curable heat conductive silicone composition that is cured by a condensation reaction, the base polymer organopolysiloxane (A It is preferable that the component (A-III) shown below is used as a component, the thermal conductive filler (B) is blended, and the component shown below is further contained. (A-III) The following general formula (4) Wherein R 6 is the same or different unsubstituted or halogen atom-substituted or cyano group-substituted alkyl group having 1 to 5 carbon atoms or aryl group having 6 to 8 carbon atoms.
- the component (A-III) is used as a base polymer when the silicone composition of the present invention is a condensation-cured product, and is represented by the following general formula (4) and has a kinematic viscosity at 25 ° C. of 10 to 100,000 mm. 2 / s is an organopolysiloxane having both ends blocked with hydroxyl groups.
- R 6 is the same or different unsubstituted or halogen atom-substituted or cyano group-substituted alkyl group having 1 to 5 carbon atoms or aryl group having 6 to 8 carbon atoms. (It is an integer.)
- R 6 specifically, an alkyl group having 1 to 7 carbon atoms such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, phenyl group, etc.
- Examples include a halogen atom-substituted alkyl group or aryl group such as methyl group, 3-chloropropyl group, trifluoromethyl group, cyanoethyl group, cyano group-substituted alkyl group or aryl group. These can be used individually by 1 type or in combination of 2 or more types. e is an integer of 1 or more, preferably 100 to 1,000.
- the component (B) used in the addition reaction curable heat conductive silicone composition is the above-described heat conductive filler (B).
- the compounding quantity of a component is suitably selected within the range prescribed
- R 7 is unsubstituted or halogen-substituted or cyano-substituted, methyl group, ethyl group having 1 to 3 carbon atoms, alkyl group, vinyl group and propyl group is phenyl group.
- X is a hydrolyzable group, and examples thereof include an alkoxy group, an alkoxyalkoxy group, an alkenyloxy group, a ketoxime group, an acyloxy group, an amino group, an amide group, and an aminoxy group.
- the alkoxy group and alkoxyalkoxy group may be substituted with a halogen atom.
- alkenyloxy group include an isopropenoxy group.
- Examples of the ketoxime group include a dimethyl ketoxime group, a methyl ethyl ketoxime group, and a diethyl ketoxime group.
- Examples of the acyloxy group include an acetoxy group and a propionyloxy group.
- Examples of the amino group include a dimethylamino group, a diethylamino group, an n-butylamino group, and a cyclohexylamino group.
- Examples of the amide group include an N-methylacetamide group, an N-ethylacetamide group, an N-butylacetamide group, an N-cyclohexylacetamide group, and the like.
- Examples of the aminoxy group include N, N-dimethylaminoxy group, N, N-diethylaminoxy group and the like.
- X is particularly preferably an alkenyloxy group.
- b is 0 or 1.
- silane compounds their (partial) hydrolysates or (partial) hydrolysis condensates include tetramethoxysilane, tetraethoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane, vinyltrimethoxysilane, 3, 3,3-trifluoropropyltrimethoxysilane, ⁇ -cyanoethyltrimethoxysilane, tetraisopropoxysilane, tetrabutoxysilane, phenyltrimethoxysilane, tetra ( ⁇ -chloroethoxy) silane, tetra (2,2,2-tri Alkoxysilanes such as fluoroethoxy) silane, propyltris ( ⁇ -chlorobutoxy) silane, methyltris (methoxyethoxy) silane, alkoxysiloxanes such as ethylpolysilicate, dimethylte
- the blending amount of the component (H) is preferably 1 to 40 parts by mass, more preferably 2 to 30 parts by mass with respect to 100 parts by mass of the component (A-III).
- (I) Curing catalyst for condensation reaction (I) Component is alkyl tin ester compound, titanate ester, titanium chelate compound, organic zinc compound, organic iron compound, organic cobalt compound, organic manganese compound, organic aluminum compound, hexylamine, dodecylamine phosphate, quaternary It is a curing catalyst for condensation reaction selected from ammonium salts, lower fatty acid salts of alkali metals, dialkylhydroxylamine, and silanes and siloxanes containing guanidyl groups, and is a condensation catalyst for curing the silicone composition of the present invention. These can be used individually by 1 type or in combination of 2 or more types.
- alkyltin ester compounds such as dibutyltin diacetate, dibutyltin dilaurate, and dibutyltin dioctoate; tetraisopropoxytitanium, tetran-butoxytitanium, tetrakis (2-ethylhexoxy) titanium, dipropoxybis (acetylacetona) ) Titanic acid esters such as titanium and titanium isopropoxyoctylene glycol; diisopropoxybis (ethylacetoacetate) titanium, diisopropoxybis (methylacetoacetate) titanium, diisopropoxybis (acetylacetonate) titanium, dibutoxybis ( Titanium chelate compounds such as ethyl acetoacetonate) titanium and dimethoxybis (ethylacetoacetonate) titanium; zinc naphthenate, zinc stearate, zinc-2-ethyl octoate , Organic metals such as
- silane or siloxane containing a guanidyl group such as tetramethylguanidylpropyltrimethoxysilane, tetramethylguanidylpropylmethyldimethoxysilane, tetramethylguanidylpropyltris (trimethylsiloxy) silane, or the like is preferably used. .
- the compounding amount of the component (I) is preferably 0.01 to 20 parts by mass, more preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the component (A-III).
- the heat-conductive silicone composition of the present invention may further contain other components such as an internal release agent, a colorant, and an antioxidant as long as the object of the present invention is not impaired.
- the heat conductive silicone composition of this invention can be prepared by mixing the predetermined amount of said each component.
- Aluminum hydroxide A method for producing a thermally conductive silicone composition, which includes a step of mixing 1,300 to 1,700 parts by mass.
- non-sintered crushed aluminum nitride having an average particle size of 70 to 90 ⁇ m is preferable, and as the component (B-IV), crushed aluminum oxide having an average particle size of 0.5 ⁇ m or more and less than 5 ⁇ m. Is preferred. In this case, the amount of component (B-IV) is more preferably 1,500 to 1,700 parts by mass.
- the curing conditions for the addition reaction curable heat conductive silicone composition are 100 to 140 ° C., particularly 110 to 130 ° C., 5 to 30 minutes, especially 10 Can be up to 20 minutes.
- a condensation reaction curable heat conductive silicone composition it can be set to 40 ° C. or less, particularly 0 to 40 ° C. for 0.5 to 30 days, particularly 1 to 15 days.
- the temperature can be set at 110 to 190 ° C., particularly 120 to 170 ° C. for 5 to 30 minutes, particularly 10 to 20 minutes.
- the cured product of the thermally conductive silicone composition preferably has the following properties.
- Thermal conductivity of the cured product of the thermally conductive silicone composition is preferably 8 W / mK or more, more preferably 9 W / mK or more.
- the thermal conductivity is lower than 8 W / mK, it can be achieved even when aluminum nitride having an average particle size of less than 50 ⁇ m is used.
- the upper limit is not particularly limited and may be high, but may be, for example, 15 W / mK or less.
- the thermal conductivity is measured using TPA-501 (Kyoto Electronics).
- the hardness of the cured product of the thermally conductive silicone composition is preferably 50 or less in terms of Asker C hardness, more preferably 40 or less and 5 or more. When the Asker C hardness exceeds 50, stress is applied to the heat-generating component during mounting, and it may not follow the fine unevenness of the heat-generating component or the cooling component, leading to deterioration of contact thermal resistance.
- the dielectric breakdown voltage of 1 mm thickness of the cured product of the heat conductive silicone composition is preferably 6 kV or more. By setting it to 6 kV or more, more insulating properties can be obtained.
- the upper limit is not particularly limited, but can be 25 kV or less.
- Component (C) dimethylpolysiloxane in which one end represented by the following formula is blocked with a trimethoxysilyl group (specific gravity: 1.0)
- Component (F) addition reaction control agent (specific gravity: 1.0) Ethynyl methylidene carbinol.
- Examples 1 to 6 Comparative Examples 1 to 4
- a composition was prepared by the method described below, and a thermally conductive molded product was obtained using the composition. Using these, evaluation was carried out by the method shown below. The results are shown in Tables 1 and 2.
- Thermal conductivity The obtained composition was cured into a sheet having a thickness of 6 mm, two sheets were used, and the heat of the sheet was measured using a thermal conductivity meter (TPA-501, trade name, manufactured by Kyoto Electronics Industry Co., Ltd.). Conductivity was measured.
- hardness The obtained composition was cured into a sheet having a thickness of 6 mm, and the two sheets were stacked and measured with an Asker C hardness meter.
- Dielectric breakdown voltage The obtained composition was cured on a 1 mm thick sheet, and the dielectric breakdown voltage was measured based on JIS K 6249.
- the cured product has a proportion of 57.8% by volume of thermally conductive filler in the composition. Insufficient thermal conductivity is obtained. Further, when the proportion of aluminum nitride in the thermally conductive filler is 38% by volume as in Comparative Example 2, even when the volume percent occupied by the thermally conductive filler is 82.9%, aluminum nitride is used. Compared to the above, the thermal conductivity becomes small. When aluminum nitride having an average particle size of 40 ⁇ m used as in Comparative Example 4 was used, it was difficult to prepare the heat conductive silicone composition itself.
- the average particle diameter of aluminum nitride used as in the examples is 50 ⁇ m or more, the volume% occupied by the heat conductive filler, and the volume% occupied by aluminum nitride in the heat conductive filler are adequate, A cured product of a thermally conductive silicone composition having high thermal conductivity while having insulating properties is provided.
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Abstract
Description
[1].(A)オルガノポリシロキサンをベースポリマーとし、(B)熱伝導性充填材を含む熱伝導性シリコーン組成物であって、(B)熱伝導性充填材が熱伝導性シリコーン組成物中60~85体積%であり、熱伝導性充填材中40~60体積%が平均粒径50μm以上の窒化アルミニウムである熱伝導性シリコーン組成物。
[2].窒化アルミニウムが非焼結の破砕状窒化アルミニウムである[1]記載の熱伝導性シリコーン組成物。
[3].熱伝導性充填材としての窒化アルミニウムの総量1に対して、平均粒径50μm以上70μm未満の窒化アルミニウムの体積比が0.5~0.6であり、平均粒径70~90μmの窒化アルミニウムの体積比が0.4~0.5である[1]又は[2]記載の熱伝導性シリコーン組成物。
[4].熱伝導性充填材中25~45体積%が平均粒径5μm以下の熱伝導性充填材である[1]~[3]のいずれかに記載の熱伝導性シリコーン組成物。
[5].平均粒径5μm以下の熱伝導性充填材が、非球状酸化アルミニウムである[4]記載の熱伝導性シリコーン組成物。
[6].(A)オルガノポリシロキサン:100質量部、
(B-I)平均粒径50μm以上70μm未満の窒化アルミニウム:1,100~1,400質量部、
(B-II)平均粒径70~90μmの窒化アルミニウム:900~1,200質量部、
(B-III)平均粒径5~15μmの酸化アルミニウム:650~800質量部、及び
(B-IV)平均粒径0.5μm以上5μm未満の酸化アルミニウム又は平均粒径0.5μm以上5μm未満の水酸化アルミニウム:1,300~1,700質量部
を含む[1]記載の熱伝導性シリコーン組成物。
[7].(B-I)成分が、平均粒径50μm以上70μm未満の非焼結の破砕状窒化アルミニウムであり、(B-II)成分が、平均粒径70~90μmの非焼結の破砕状窒化アルミニウム又は平均粒径70~90μmの焼結の球状窒化アルミニウムであり、(B-III)成分が、平均粒径5~15μmの球状酸化アルミニウムであり、(B-IV)成分が、平均粒径0.5μm以上5μm未満の破砕状酸化アルミニウム又は平均粒径0.5μm以上5μm未満の水酸化アルミニウムである[6]記載の熱伝導性シリコーン組成物。
[8].さらに、(C):下記(C-1)及び(C-2)から選ばれる1種以上:(A)成分100質量部に対して10~160質量部を含む[1]~[7]のいずれかに記載の熱伝導性シリコーン組成物。
(C-1)下記一般式(1)で表されるアルコキシシラン化合物
R1 aR2 bSi(OR3)4-a-b (1)
(式中、R1は独立に炭素原子数6~15のアルキル基であり、R2は独立に非置換又は置換の炭素原子数1~8の1価炭化水素基であり、R3は独立に炭素原子数1~6のアルキル基であり、aは1~3の整数、bは0~2の整数であり、但しa+bは1~3の整数である。)
(C-2)成分下記一般式(2)で表される分子鎖片末端がトリアルコキシ基で封鎖されたジメチルポリシロキサン
[9].熱伝導率が8W/mK以上である[1]~[8]のいずれかに記載の熱伝導性シリコーン組成物の硬化物。
[10].硬度がアスカーC硬度で50以下である[9]記載の熱伝導性シリコーン組成物の硬化物。
[11].1mm厚の絶縁破壊電圧が6kV以上である[9]又は[10]記載の熱伝導性シリコーン組成物の硬化物。
[12].(A)オルガノポリシロキサン:100質量部、
(B-I)平均粒径50μm以上70μm未満の窒化アルミニウム:1,100~1,400質量部、
(B-II)平均粒径70~90μmの窒化アルミニウム:900~1,200質量部、
(B-III)平均粒径5~15μmの酸化アルミニウム:650~800質量部、及び
(B-IV)平均粒径0.5μm以上5μm未満の酸化アルミニウム又は平均粒径0.5μm以上5μm未満の水酸化アルミニウム:1,300~1,700質量部
を混合する工程を含む、[1]又は[6]記載の熱伝導性シリコーン組成物を製造する方法。
本発明に用いられるベースポリマーのオルガノポリシロキサンは、その種類は特に限定されないが、通常は、主鎖部分が基本的にジオルガノシロキサン単位の繰り返しからなるものが一般的であり、これは分子構造の一部に分枝状の構造を含んだものであってもよく、また環状体であってもよい。硬化物の機械的強度等、物性の点から、直鎖状のジオルガノポリシロキサンであることが好ましい。なお、オルガノポリシロキサンの末端は、トリオルガノシリル基で封鎖されていても、ジオルガノヒドロキシシリル基で封鎖されていてもよい。このオルガノポリシロキサンは、1種単独でも動粘度が異なる2種以上を組み合わせて用いてもよい。
熱伝導性充填材は、非磁性の銅やアルミニウム等の金属、酸化アルミニウム、シリカ、マグネシア、ベンガラ、ベリリア、チタニア、ジルコニア等の金属酸化物、窒化アルミニウム、窒化ケイ素、窒化硼素等の金属窒化物、水酸化マグネシウム等の金属水酸化物、人工ダイヤモンド、炭化珪素等一般に熱伝導充填材とされる物質を用いることができる。また粒径は0.1~200μmを用いることができ、規定する要件を満たす範囲で1種又は2種以上複合して用いてもよい。なお熱伝導性充填材の粒径は、レーザー回折・散乱式の粒子径分布測定装置、例えばマイクロトラックMT3300EX(日機装)を用いて測定され、平均粒径は体積基準の値(粒体の体積分布を測定した際、この平均粒径を境に2つに分けた時、大きい側と小さい側が等量になる径を指す。以下、同様)である。
本発明においては、熱伝導性充填材中40~60体積%、好適には45~55体積%が平均粒径50μm以上の窒化アルミニウムである。窒化アルミニウムの平均粒径は、50μm以上であり、50μm以上200μm以下が好ましく、より好ましくは60μm以上200μm以下である。平均粒径50μm以下の窒化アルミニウムを多量に用いると、充填が困難になってしまう。さらに前述の通り、充填する量が同じであれば、粒径が大きい方が得られる組成物の熱伝導率は高くなるので、出来るだけ平均粒径の大きい粒子を用いる。しかしながら、平均粒径が200μmを超えると組成物へ添加した際の流動性が損なわれてしまうおそれがある。上記平均粒径であれば、破砕状であっても、球状であってもよく、破砕状のものが好ましい。なお、破砕状、球状のものは公知のものを使用することができる。
酸化アルミニウム(アルミナ)は球状でも、非球状でもよい。非球状酸化アルミニウムには破砕状、丸み状等が挙げられ、球状酸化アルミニウムに比べて安価であるので、得られる組成物に価格競争力を付与できる点から、非球状酸化アルミニウムがより好ましい。
(A)オルガノポリシロキサン:100質量部、
(B-I)平均粒径50μm以上70μm未満の窒化アルミニウム:1,100~1,400質量部、
(B-II)平均粒径70~90μmの窒化アルミニウム:900~1,200質量部、
(B-III)平均粒径5~15μmの酸化アルミニウム:650~800質量部、及び
(B-IV)平均粒径0.5μm以上5μm未満の酸化アルミニウム又は平均粒径0.5μm以上5μm未満の水酸化アルミニウム:1,300~1,700質量部
を含む熱伝導性シリコーン組成物。
(A)オルガノポリシロキサン:100質量部、
(B-I)平均粒径50μm以上70μm未満の非焼結の破砕状窒化アルミニウム:1,100~1,400質量部、
(B-II)平均粒径70~90μmの非焼結の破砕状窒化アルミニウム又は平均粒径70~90μmの焼結の球状窒化アルミニウム:900~1,200質量部、
(B-III)平均粒径5~15μmの球状酸化アルミニウム:650~800質量部、及び
(B-IV)平均粒径0.5μm以上5μm未満の破砕状酸化アルミニウム又は平均粒径0.5μm以上5μm未満の水酸化アルミニウム:1,300~1,700質量部
を含む熱伝導性シリコーン組成物。
本発明の熱伝導性シリコーン組成物には、組成物調製時に熱伝導性充填材を疎水化処理し、(A)成分であるオルガノポリシロキサンとの濡れ性向上させ、(B)熱伝導性充填材を(A)成分からなるマトリックス中に均一に分散させることを目的として、(C)表面処理剤を配合することができる。(C)成分としては、下記(C-1)及び(C-2)成分が好ましく、これらから選ばれる1種又は2種以上を組み合わせて用いることができる。
R1 aR2 bSi(OR3)4-a-b (1)
(式中、R1は独立に炭素原子数6~15のアルキル基であり、R2は独立に非置換又は置換の炭素原子数1~8の1価炭化水素基であり、R3は独立に炭素原子数1~6のアルキル基であり、aは1~3の整数、bは0~2の整数であり、但しa+bは1~3の整数である。)
C6H13Si(OCH3)3
C10H21Si(OCH3)3
C12H25Si(OCH3)3
C12H25Si(OC2H5)3
C10H21Si(CH3)(OCH3)2
C10H21Si(C6H5)(OCH3)2
C10H21Si(CH3)(OC2H5)2
C10H21Si(CH=CH2)(OCH3)2
C10H21Si(CH2CH2CF3)(OCH3)2
[1]付加反応硬化型熱伝導性シリコーン組成物
[2]有機過酸化物硬化型熱伝導性シリコーン組成物
[3]縮合反応硬化型熱伝導性シリコーン組成物
組成物がヒドロシリル化反応により硬化する付加反応硬化型熱伝導性シリコーン組成物である場合には、上記ベースポリマーであるオルガノポリシロキサン(A)として下記に示す(A-I)成分を用い、上記熱伝導性充填材(B)を配合し、更に下記に示す成分を含有するものであることが好ましい。以下に好ましい配合量も併記する。
(A-I)分子中に少なくとも2個のアルケニル基を有するオルガノポリシロキサン
(B)熱伝導性充填材:上記に記載した通り
(D)ケイ素原子に直接結合した水素原子を少なくとも2個有するオルガノハイドロジェンポリシロキサン
(E)白金族金属系硬化触媒
(F)付加反応制御剤
さらに、(C):上記(C-1)及び(C-2)から選ばれる1種以上:(A)成分100質量部に対して10~160質量部を配合してもよい。
通常は主鎖部分が基本的にジオルガノシロキサン単位の繰り返しからなるのが一般的であるが、これは分子構造の一部に分枝状の構造を含んだものであってもよく、また環状体であってもよいが、硬化物の機械的強度等、物性の点から直鎖状のジオルガノポリシロキサンが好ましい。
付加反応硬化型熱伝導性シリコーン組成物に用いる(B)成分は、上述した熱伝導性充填材(B)である。(B)成分の配合量は上記で規定された範囲内で適宜選定される。例えば、(A-I)成分100質量部に対して1,000~8,000質量部、3,000~6,000質量部の範囲で適宜選定される。
(D)成分は、ケイ素原子に直接結合した水素原子を少なくとも2個有するオルガノハイドロジェンポリシロキサンであり、1分子中に平均で2個以上、好ましくは2~100個のケイ素原子に直接結合する水素原子(Si-H基)を有するオルガノハイドロジェンポリシロキサンが好ましく、(A-I)成分の架橋剤として作用する成分である。即ち、(D)成分中のSi-H基と(A-I)成分中のアルケニル基との後述する(E)成分の白金族金属系硬化触媒により促進されるヒドロシリル化反応により付加して、架橋構造を有する3次元網目構造を与える。また、Si-H基の数が2個未満の場合、硬化しないおそれがある。
(E)成分の白金族金属系硬化触媒は、(A-I)成分由来のアルケニル基と、(D)成分由来のSi-H基の付加反応を促進するための付加反応触媒であり、ヒドロシリル化反応に用いられる触媒として周知の触媒が挙げられる。その具体例としては、例えば、白金(白金黒を含む)、ロジウム、パラジウム等の白金族金属単体、H2PtCl4・nH2O、H2PtCl6・nH2O、NaHPtCl6・nH2O、KaHPtCl6・nH2O、Na2PtCl6・nH2O、K2PtCl4・nH2O、PtCl4・nH2O、PtCl2、Na2HPtCl4・nH2O(但し、式中、nは0~6の整数であり、好ましくは0又は6である)等の塩化白金、塩化白金酸及び塩化白金酸塩、アルコール変性塩化白金酸(米国特許第3,220,972号明細書参照)、塩化白金酸とオレフィンとのコンプレックス(米国特許第3,159,601号明細書、同第3,159,662号明細書、同第3,775,452号明細書参照)、白金黒、パラジウム等の白金族金属を酸化アルミニウム、シリカ、カーボン等の担体に担持させたもの、ロジウム-オレフィンコンプレックス、クロロトリス(トリフェニルフォスフィン)ロジウム(ウィルキンソン触媒)、塩化白金、塩化白金酸又は塩化白金酸塩とビニル基含有シロキサン、特にビニル基含有環状シロキサンとのコンプレックス等が挙げられる。
付加反応硬化型熱伝導性シリコーン組成物には、必要に応じて(F)付加反応制御剤を用いることができる。付加反応制御剤は、通常の付加反応硬化型シリコーン組成物に用いられる公知の付加反応制御剤を全て用いることができる。例えば、エチニルメチリデンカルビノール、1-エチニル-1-ヘキサノール、3-ブチン-1-オール等のアセチレン化合物や各種窒素化合物、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。付加反応制御剤の使用量としては、(A-I)成分100質量部に対して0.01~1質量部が好ましい。
また、本組成物が有機過酸化物によるフリーラジカル反応により硬化する有機過酸化物硬化型熱伝導性シリコーン組成物である場合には、上記ベースポリマーであるオルガノポリシロキサン(A)として下記に示す(A-II)を用い、上記熱伝導性充填材(B)を配合し、更に下記に示す成分を含有するものであることが好ましい。
(A-II)1分子中に少なくとも2個のケイ素原子に結合したアルケニル基を有するオルガノポリシロキサン
(B)熱伝導性充填材:上記に記載した通り
(G)有機過酸化物
さらに、(C):上記(C-1)及び(C-2)から選ばれる1種以上:(A)成分100質量部に対して10~160質量部を配合してもよい。
(A-II)1分子中に少なくとも2個のケイ素原子に結合したアルケニル基を有するオルガノポリシロキサンであれば特に限定されないが、前記(A-I)成分の1分子中に少なくとも2個のアルケニル基を有するオルガノポリシロキサンと同様のものを用いることが好ましい。
有機過酸化物硬化型熱伝導性シリコーン組成物に用いる(B)成分は、上述した熱伝導性充填材(B)である。(B)成分の配合量は上記で規定された範囲内で適宜選定される。例えば、(A-II)成分100質量部に対して1,000~8,000質量部、3,000~6,000質量部の範囲で適宜選定される。
(G)成分である有機過酸化物は、特定の条件下で分解して遊離ラジカルを生じる有機過酸化物であり、1種単独で又は2種以上を適宜組み合わせて用いることができる。
具体的には、1,1-ジ(tert-ブチルパーオキシ)シクロヘキサン、2,2-ジ(4,4-ジ-(tert-ブチルパーオキシ)シクロヘキシル)プロパン等のパーオキシケタール、p-メンタンハイドロパーオキサイド、ジイソプロピルベンゼンハイドロパーオキサイド等のハイドロパーオキサイド、ジクミルパーオキサイド、tert-ブチルクミルパーオキサイド等のジアルキルパーオキサイド、ジベンゾイルパーオキサイド、ジスクシン酸パーオキサイド等のジアシルパーオキサイド、tert-ブチルパーオキシアセテート、tert-ブチルパーオキシベンゾエート等のパーオキシエステル、ジイソプロピルパーオキシジカーボネート等のパーオキシジカーボネートが好適に用いられる。特には、分解温度が比較的高いパーオキシケタール、ハイドロパーオキサイド、ジアルキルパーオキサイド、パーオキシエステルの使用が、取扱い性や保存安定性の観点から好ましい。また、これらの有機過酸化物は、任意の有機溶剤や炭化水素、流動パラフィンや不活性固体等で希釈されたものを用いてもよい。
また、本組成物が縮合反応により硬化する縮合反応硬化型熱伝導性シリコーン組成物である場合には、上記ベースポリマーであるオルガノポリシロキサン(A)成分として下記に示す(A-III)成分を用い、上記熱伝導性充填材(B)を配合し、更に下記に示す成分を含有するものであることが好ましい。
(A-III)下記一般式(4)
で示され、両末端が水酸基で封鎖されたオルガノポリシロキサン、
(B)上記熱伝導性充填材、
(H)下記一般式(5)
R7 f-SiX(4-f) (5)
(式中、R7は非置換又はハロゲン原子置換もしくはシアノ基置換の、炭素原子数1~3のアルキル基、ビニル基又はフェニル基であり、Xは加水分解性基であり、fは0又は1である。)
で示されるシラン化合物、その(部分)加水分解物及び(部分)加水分解縮合物から選ばれる1種以上、
(I)縮合反応用硬化触媒として、アルキル錫エステル化合物、チタン酸エステル、チタンキレート化合物、有機亜鉛化合物、有機鉄化合物、有機コバルト化合物、有機マンガン化合物、有機アルミニウム化合物、ヘキシルアミン、リン酸ドデシルアミン、第4級アンモニウム塩、アルカリ金属の低級脂肪酸塩、ジアルキルヒドロキシルアミン、ならびにグアニジル基を含有するシラン及びシロキサンから選ばれる縮合触媒
さらに、(C):上記(C-1)及び(C-2)から選ばれる1種以上:(A)成分100質量部に対して10~160質量部を配合してもよい。
(A-III)成分は、本発明のシリコーン組成物を縮合硬化物とする際の、ベースポリマーとして使用され、下記一般式(4)で示され、25℃における動粘度が10~100,000mm2/sである両末端が水酸基で封鎖されたオルガノポリシロキサンである。
付加反応硬化型熱伝導性シリコーン組成物に用いる(B)成分は、上述した熱伝導性充填材(B)である。(B)成分の配合量は上記で規定された範囲内で適宜選定される。例えば、(A-III)成分100質量部に対して1,000~8,000質量部、3,000~6,000質量部の範囲で適宜選定される。
(H)下記一般式(5)
R7 f-SiX(4-f) (5)
(式中、R7は非置換又はハロゲン原子置換もしくはシアノ基置換の、炭素原子数1~3のアルキル基、ビニル基又はフェニル基であり、Xは加水分解性基であり、fは0又は1である。)
で示されるシラン化合物、その(部分)加水分解物及び(部分)加水分解縮合物から選ばれる1種以上、
(H)成分は、本組成物を縮合反応にて硬化する際に架橋剤として作用する。
(I)成分は、アルキル錫エステル化合物、チタン酸エステル、チタンキレート化合物、有機亜鉛化合物、有機鉄化合物、有機コバルト化合物、有機マンガン化合物、有機アルミニウム化合物、ヘキシルアミン、リン酸ドデシルアミン、第4級アンモニウム塩、アルカリ金属の低級脂肪酸塩、ジアルキルヒドロキシルアミン、ならびにグアニジル基を含有するシラン及びシロキサンから選ばれる縮合反応用硬化触媒であり、本発明のシリコーン組成物を硬化させるための縮合触媒である。これらは、1種単独で又は2種以上を適宜組み合わせて用いることができる。
本発明の熱伝導性シリコーン組成物には、更に、内添離型剤、着色材、酸化防止剤等のその他の成分を本発明の目的を損なわない範囲で配合することができる。本発明の熱伝導性シリコーン組成物は、上記各成分の所定量を混合することにより調製できる。
(A)オルガノポリシロキサン:100質量部、
(B-I)平均粒径50μm以上70μm未満の窒化アルミニウム:1,100~1,400質量部、
(B-II)平均粒径70~90μmの窒化アルミニウム:900~1,200質量部、
(B-III)平均粒径5~15μmの酸化アルミニウム:650~800質量部、及び
(B-IV)平均粒径0.5μm以上5μm未満の酸化アルミニウム又は平均粒径0.5μm以上5μm未満の水酸化アルミニウム:1,300~1,700質量部
を混合する工程を含む熱伝導性シリコーン組成物の製造方法が挙げられる。
熱伝導性シリコーン組成物の硬化物は以下の性質を有することが好ましい。
熱伝導性シリコーン組成物の硬化物の熱伝導率は、8W/mK以上が好ましく、より好ましくは9W/mK以上である。8W/mKよりも熱伝導率が低い場合は、平均粒径が50μm未満の窒化アルミニウム用いた場合でも達成できる。上限は特に限定されず、高くてもよいが、例えば、15W/mK以下とすることもできる。なお、熱伝導率はTPA-501(京都電子製)を用いて測定する。
熱伝導性シリコーン組成物の硬化物の硬度は、アスカーC硬度で50以下が好ましく、より好ましくは40以下5以上である。アスカーC硬度で50を超えると、実装する際に発熱部品に応力が掛かってしまうし、発熱部品や冷却部品の微細な凸凹に追従せず、接触熱抵抗の悪化を招くおそれがある。
熱伝導性シリコーン組成物の硬化物の1mm厚の絶縁破壊電圧は6kV以上が好ましい。6kV以上とすることで、より絶縁性を得ることができる。上限は特に限定されないが、25kV以下とすることもできる。
(A)成分:下記式で表されるオルガノポリシロキサン(比重:1.0)
(A-2)粘度:500mm2/s
(式中、Viはビニル基であり、gは上記粘度になる値である。)
(B-1)平均粒径:60μm:非焼結の破砕状窒化アルミニウム(比重:3.26):(B-I)
(B-2)平均粒径:80μm:非焼結の破砕状窒化アルミニウム(比重:3.26):(B-II)
(B-3)平均粒径:10μm:球状酸化アルミニウム(比重:3.98):(B-III)
(B-4)平均粒径:1μm:破砕状酸化アルミニウム(比重:3.98):(B-IV)
(B-5)平均粒径:80μm:焼結の球状窒化アルミニウム(比重:3.26):(B-II)
(B-6)平均粒径:40μm:非焼結の球状窒化アルミニウム(比重:3.26)
(B-7)平均粒径:80μm:球状酸化アルミニウム(比重:3.98)
(B-8)平均粒径:1μm:水酸化アルミニウム(比重:2.42):(B-IV)
5質量%塩化白金酸2-エチルヘキサノール溶液
エチニルメチリデンカルビノール。
オルトメチルベンゾイルパーオキサイド(C-23N(信越化学工業製))(比重:1.0)
上記成分を用い、下記に示す方法で組成物を調製し、該組成物を用いて熱伝導性成型物を得た。これらを用いて下記に示す方法により評価した。結果を表1,2に示す。
(A)~(C)成分を所定の量を加え、プラネタリーミキサーで60分間混練した。そこにさらに(D)~(G)成分を添加しさらに30分間混練し、熱伝導性シリコーン組成物を得た。
得られた組成物を金型に流し込みプレス成形機を用い120℃、10分間で成形した。
熱伝導率:
得られた組成物を6mm厚のシート状に硬化させ、そのシートを2枚用いて、熱伝導率計(TPA-501、京都電子工業株式会社製の商品名)を用いて、該シートの熱伝導率を測定した。
硬度:
得られた組成物を6mm厚のシート状に硬化させ、そのシートを2枚重ねてアスカーC硬度計で測定した。
絶縁破壊電圧:
得られた組成物を1mm厚のシート上に硬化させ、JIS K 6249に基づき、絶縁破壊電圧を測定した。
Claims (12)
- (A)オルガノポリシロキサンをベースポリマーとし、(B)熱伝導性充填材を含む熱伝導性シリコーン組成物であって、(B)熱伝導性充填材が熱伝導性シリコーン組成物中60~85体積%であり、熱伝導性充填材中40~60体積%が平均粒径50μm以上の窒化アルミニウムである熱伝導性シリコーン組成物。
- 窒化アルミニウムが非焼結の破砕状窒化アルミニウムである請求項1記載の熱伝導性シリコーン組成物。
- 熱伝導性充填材としての窒化アルミニウムの総量1に対して、平均粒径50μm以上70μm未満の窒化アルミニウムの体積比が0.5~0.6であり、平均粒径70~90μmの窒化アルミニウムの体積比が0.4~0.5である請求項1又は2記載の熱伝導性シリコーン組成物。
- 熱伝導性充填材中25~45体積%が、平均粒径5μm以下の熱伝導性充填材である請求項1~3のいずれか1項記載の熱伝導性シリコーン組成物。
- 平均粒径5μm以下の熱伝導性充填材が、非球状酸化アルミニウムである請求項4記載の熱伝導性シリコーン組成物。
- (A)オルガノポリシロキサン:100質量部、
(B-I)平均粒径50μm以上70μm未満の窒化アルミニウム:1,100~1,400質量部、
(B-II)平均粒径70~90μmの窒化アルミニウム:900~1,200質量部、
(B-III)平均粒径5~15μmの酸化アルミニウム:650~800質量部、及び
(B-IV)平均粒径0.5μm以上5μm未満の酸化アルミニウム又は平均粒径0.5μm以上5μm未満の水酸化アルミニウム:1,300~1,700質量部
を含む請求項1記載の熱伝導性シリコーン組成物。 - (B-I)成分が、平均粒径50μm以上70μm未満の非焼結の破砕状窒化アルミニウムであり、(B-II)成分が、平均粒径70~90μmの非焼結の破砕状窒化アルミニウム又は平均粒径70~90μmの焼結の球状窒化アルミニウムであり、(B-III)成分が、平均粒径5~15μmの球状酸化アルミニウムであり、(B-IV)成分が、平均粒径0.5μm以上5μm未満の破砕状酸化アルミニウム又は平均粒径0.5μm以上5μm未満の水酸化アルミニウムである請求項6記載の熱伝導性シリコーン組成物。
- さらに、(C):下記(C-1)及び(C-2)から選ばれる1種以上:(A)成分100質量部に対して10~160質量部を含む請求項1~7のいずれか1項記載の熱伝導性シリコーン組成物。
(C-1)下記一般式(1)で表されるアルコキシシラン化合物
R1 aR2 bSi(OR3)4-a-b (1)
(式中、R1は独立に炭素原子数6~15のアルキル基であり、R2は独立に非置換又は置換の炭素原子数1~8の1価炭化水素基であり、R3は独立に炭素原子数1~6のアルキル基であり、aは1~3の整数、bは0~2の整数であり、但しa+bは1~3の整数である。)
(C-2)成分下記一般式(2)で表される分子鎖片末端がトリアルコキシ基で封鎖されたジメチルポリシロキサン
- 熱伝導率が8W/mK以上である請求項1~8のいずれか1項記載の熱伝導性シリコーン組成物の硬化物。
- 硬度がアスカーC硬度で50以下である請求項9記載の熱伝導性シリコーン組成物の硬化物。
- 1mm厚の絶縁破壊電圧が6kV以上である請求項9又は10記載の熱伝導性シリコーン組成物の硬化物。
- (A)オルガノポリシロキサン:100質量部、
(B-I)平均粒径50μm以上70μm未満の窒化アルミニウム:1,100~1,400質量部、
(B-II)平均粒径70~90μmの窒化アルミニウム:900~1,200質量部、
(B-III)平均粒径5~15μmの酸化アルミニウム:650~800質量部、及び
(B-IV)平均粒径0.5μm以上5μm未満の酸化アルミニウム又は平均粒径0.5μm以上5μm未満の水酸化アルミニウム:1,300~1,700質量部
を混合する工程を含む、請求項1又は6記載の熱伝導性シリコーン組成物を製造する方法。
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JP7285231B2 (ja) | 2020-05-08 | 2023-06-01 | 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硬化物 |
WO2021256391A1 (ja) * | 2020-06-18 | 2021-12-23 | 信越化学工業株式会社 | シリコーン組成物、及び高熱伝導性を有する熱伝導性シリコーン硬化物 |
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JP2021195499A (ja) * | 2020-06-18 | 2021-12-27 | 信越化学工業株式会社 | シリコーン組成物、及び高熱伝導性を有する熱伝導性シリコーン硬化物 |
WO2022075434A1 (ja) * | 2020-10-09 | 2022-04-14 | ダウ・東レ株式会社 | 熱伝導性シリコーン組成物および熱伝導性部材 |
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JP7530864B2 (ja) | 2021-05-26 | 2024-08-08 | 信越化学工業株式会社 | 熱伝導性シリコーン組成物 |
WO2023080234A1 (ja) * | 2021-11-05 | 2023-05-11 | 積水ポリマテック株式会社 | 熱伝導性シート |
WO2024150726A1 (ja) * | 2023-01-13 | 2024-07-18 | 信越化学工業株式会社 | 熱軟化性熱伝導性部材 |
WO2024195569A1 (ja) * | 2023-03-22 | 2024-09-26 | 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硬化物、ならびに製造方法 |
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KR102384193B1 (ko) | 2022-04-07 |
EP3530702B1 (en) | 2024-02-21 |
KR20190069495A (ko) | 2019-06-19 |
JPWO2018074247A1 (ja) | 2019-01-17 |
TWI753029B (zh) | 2022-01-21 |
JP6947186B2 (ja) | 2021-10-13 |
CN109844030B (zh) | 2022-04-26 |
EP3530702A4 (en) | 2020-05-20 |
US11248154B2 (en) | 2022-02-15 |
TW201823362A (zh) | 2018-07-01 |
US20190256756A1 (en) | 2019-08-22 |
CN109844030A (zh) | 2019-06-04 |
EP3530702A1 (en) | 2019-08-28 |
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