WO2022224579A1 - 熱伝導性複合シート及び発熱性電子部品の実装方法 - Google Patents
熱伝導性複合シート及び発熱性電子部品の実装方法 Download PDFInfo
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- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/283—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysiloxanes
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- C08K5/5415—Silicon-containing compounds containing oxygen containing at least one Si—O bond
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Definitions
- the present invention relates to a thermally conductive composite sheet and a method for mounting heat-generating electronic components.
- LSI chips such as CPUs, driver ICs, and memories used in electronic devices such as personal computers and mobile phones generate a large amount of heat as they become more sophisticated, faster, smaller, and highly integrated. As a result, the temperature rise of the chip due to the heat causes malfunction and destruction of the chip. In recent years, heat countermeasures have also been required for batteries of electric vehicles, and many heat dissipation methods and heat dissipation members used therefor have been proposed for suppressing temperature rises.
- Thermally conductive sheets are often used when there is a certain amount of space between heat-generating electronic components and cooling components such as heat sinks and housings. In many cases, it is necessary to ensure electrical insulation between a heating element (heat-generating electronic component) and a heat sink or housing, and thermally conductive sheets are often required to have insulation. In such cases, it is often the case that the thickness of the heat conductive sheet is given to absorb the thickness tolerance of the heat-generating electronic parts and the cooling parts such as the heat sink and housing, and the hardness is set to be low. . By doing so, component tolerances can be efficiently absorbed, and stresses when compressed can be reduced.
- the heat-generating electronic component is placed vertically on the thermal conductive sheet and fixed by applying pressure with a screw or the like. is common.
- the thermally conductive sheet is soft, the thermally conductive sheet is deformed or damaged when an attempt is made to slide a heat-generating electronic component on the sheet. This is because the thermally conductive sheet is soft and lacks strength, and because of its softness, the surface of the sheet has a tacky feel, resulting in poor slidability.
- Problems related to the mounting process and the structure of heat-generating electronic components include, for example, cases in which the structure of an electronic device is complicated and the direction in which heat-generating electronic components are mounted is limited, and problems in the structure of heat-generating electronic components.
- the direction in which stress can be applied during mounting is limited due to a problem.
- after attaching the thermally conductive sheet to the cooling component it is necessary to slide over the sheet in order to install the heat-generating electronic components.
- Patent Document 1 In order to improve slidability, it is necessary to reduce the surface friction. With silicone materials, adding oil that has poor compatibility regardless of the rubber cross-linking structure causes the oil to seep out onto the sheet surface, thereby lowering the coefficient of friction.
- Patent Document 2 thermally conductive sheets are not effective because they are soft and tacky.
- Patent Document 2 There is also a known method of lowering the coefficient of friction by adjusting the content of alkenyl groups in the silicone base polymer, but this method applies to millable silicone rubber materials, and is used to soften the hardness of the cured sheet. is difficult (Patent Document 2).
- Patent Document 3 a method of laminating a high-hardness rubber sheet on one side of a low-hardness sheet (Patent Document 3) can be considered, but the rubber sheet is scraped when the heat-generating electronic parts are slid.
- a method of dusting the surface of the sheet with powder is also conceivable. Dusting can certainly improve the slipperiness of the sheet surface, but this is temporary and the effect of dusting gradually diminishes. Moreover, since the strength of the sheet surface does not change, tearing of the sheet is unavoidable.
- the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a thermally conductive composite sheet that has high surface slidability, facilitates mounting of heat-generating electronic components, and has excellent thermal conductivity. aim.
- a thermally conductive composite sheet It has an Asker C hardness of 30 or less, a surface tack force of 30 gf (0.294 N) or more, and a thickness of 0.3 mm or more and a thermal conductivity of 0.8 W/mK or more.
- a thermally conductive composite comprising a thermally conductive sheet containing a filler and an insulating resin film having a thickness of 10 ⁇ m or more and 50 ⁇ m or less and an elastic modulus of 1 GPa or more laminated on one side of the thermally conductive sheet. provide a sheet.
- Such a thermally conductive composite sheet has a highly slidable surface, facilitates mounting of heat-generating electronic components, and has excellent thermal conductivity.
- the insulating resin film is a polyester resin film.
- the thermal conductivity of the thermally conductive sheet is 3.0 W/mK or more.
- the heat generated from the exothermic electronic component can be more efficiently transferred to the cooling member.
- the thermally conductive sheet contains the following components (A) to (D): 100 parts by mass of an organopolysiloxane having two or more alkenyl groups per molecule (A), (B) Organohydrogenpolysiloxane having two or more hydrogen atoms directly bonded to silicon atoms: the number of moles of hydrogen atoms directly bonded to silicon atoms is 0.0 to the number of moles of alkenyl groups derived from component (A).
- thermally conductive filler 1,200 to 6,500 parts by mass
- platinum group metal curing catalyst 0.1 to 2,000 ppm in terms of platinum group metal element mass relative to component (A) It is preferably a cured product of a thermally conductive silicone composition containing.
- a cured product of such a composition can be suitably used as a thermally conductive sheet.
- the thermally conductive filler of the component (C) is (Ci) amorphous alumina having an average particle size of 10 to 30 ⁇ m: 500 to 1,500 parts by mass, (C-ii) spherical alumina having an average particle size of 30 to 85 ⁇ m: 150 to 4,000 parts by mass; (C-iii) Insulating inorganic filler having an average particle size of 0.1 to 6 ⁇ m: 500 to 2,000 parts by mass.
- the component (C) is the following (F) surface treatment agent (F-1) 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 a monovalent hydrocarbon group having 1 to 12 carbon atoms, R 3 is independently a ⁇ 6 alkyl group, 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.) and (F-2) the following general formula (2): (Wherein, R 4 is independently an alkyl group having 1 to 6 carbon atoms, and c is an integer of 5 to 100.)
- One end of the molecular chain represented by is preferably treated with one or more selected from the group consisting of dimethylpolysiloxane blocked with a trialkoxysilyl group.
- component (C) By hydrophobizing component (C) with component (F), the wettability with organopolysiloxane (A) component is improved, and the thermally conductive filler (C) component ( It can be uniformly dispersed in the matrix consisting of A) components.
- component (F) is 0.01 to 300 parts by mass per 100 parts by mass of component (A).
- the present invention provides a heat-generating electronic component that is fixed to the heat-generating electronic component after sliding the heat-generating electronic component on the insulating resin film of the thermally conductive composite sheet and aligning the heat-generating electronic component with the intended position.
- a heat-generating electronic component that is fixed to the heat-generating electronic component after sliding the heat-generating electronic component on the insulating resin film of the thermally conductive composite sheet and aligning the heat-generating electronic component with the intended position.
- thermoly conductive sheet has excellent slidability, so that the sheet does not peel off or break. It is possible to slide and mount heat-generating electronic components without having to remove them, and it is possible to widen the range of mounting methods.
- the heat-generating electronic component when mounting a heat-generating electronic component in an electronic device, for example, can be mounted by sliding because one side of the thermally conductive sheet has excellent slidability.
- a silicone polymer having an Asker C hardness of 30 or less, a surface tack force of 30 gf or more, a thickness of 0.3 mm or more, and a thermal conductivity of 0.8 W/mK or more, and a thermally conductive filler.
- a thermally conductive composite sheet having excellent slidability on one side which is obtained by laminating an insulating resin film having a thickness of 10 ⁇ m or more and 50 ⁇ m or less and an elastic modulus of 1 GPa or more on one side of a conductive sheet. Even if a heat-generating component is slid on the composite sheet, it does not peel off or break.
- FIG. 1 is a schematic diagram of a thermally conductive composite sheet of the present invention
- the inventors of the present invention have found that by laminating an insulating resin film having a thickness of 10 ⁇ m or more and 50 ⁇ m or less and an elastic modulus of 1 GPa or more on one side of the thermally conductive sheet, the slidability is improved, and the thermal conductivity is improved. It has been found that heat-generating electronic components can be slidably mounted without damaging the surface of the conductive sheet.
- a thermally conductive composite sheet It has an Asker C hardness of 30 or less, a surface tack force of 30 gf (0.294 N) or more, and a thickness of 0.3 mm or more and a thermal conductivity of 0.8 W/mK or more.
- a thermally conductive composite comprising a thermally conductive sheet containing a filler and an insulating resin film having a thickness of 10 ⁇ m or more and 50 ⁇ m or less and an elastic modulus of 1 GPa or more laminated on one side of the thermally conductive sheet. is a sheet.
- the thermally conductive composite sheet of the present invention is shown, for example, in FIG.
- a thermally conductive composite sheet 1 is obtained by laminating an insulating resin film 2 on one side of a thermally conductive sheet 3 .
- the thermally conductive sheet 3 has a role of imparting thermal conductivity to the thermally conductive composite sheet 1 .
- the insulating resin film 2 has a role of providing slidability to the surface on which the insulating resin film 2 is laminated.
- the thermally conductive sheet is not particularly limited as long as its hardness, surface tack, thickness and thermal conductivity are within the following ranges. It can be a cured product. A commercially available thermally conductive sheet can also be used.
- the hardness of the thermally conductive sheet is characterized by being 30 or less, preferably 20 or less, measured by an Asker C hardness tester according to the method described in Appendix 2 of JIS K 7312:1996.
- the lower limit of hardness is not particularly limited, it is preferably 1 or more, more preferably 5 or more. If the hardness exceeds 30, it becomes difficult to compress the heat-generating electronic component when fixing it to the heat conductive sheet, and stress is applied to the heat-generating electronic component, which may cause breakage.
- the thickness of the thermally conductive sheet is 0.3 mm or more, preferably 0.4 mm or more.
- the upper limit of the thickness is not particularly limited, it can be, for example, 5 mm or less, preferably 3 mm or less, and more preferably 2 mm or less. If the thickness is less than 0.3 mm, there are many cases where the tolerance of electronic components cannot be absorbed as described above.
- the surface tack force of the thermally conductive sheet is 30 gf (0.294 N) or more, preferably 60 gf (0.588 N) or more.
- the upper limit of the tack force is not particularly limited, it is preferably 500 gf (4.903 N) or less, more preferably 200 gf (1.961 N) or less, and still more preferably 100 gf (0.981 N) or less. If it is less than 30 gf (0.294 N), it will be difficult to achieve sufficient adhesion to the adherend, and it will also easily peel off when laminated with an insulating resin film.
- the tack force can be a value measured by a tackiness tester (manufactured by Malcom) using a constant pressure penetration method.
- the thermal conductivity of thermally conductive sheet is 0.8 W/mK or higher. It is preferably 1.5 W/mK or more, more preferably 3.0 W/mK or more. Although the upper limit of the thermal conductivity is not particularly limited, it can be, for example, 10 W/mK or less, preferably 5 W/mK or less. If the thermal conductivity is less than 0.8 W/mK, the heat generated from the exothermic electronic component cannot be efficiently transferred to the cooling member. In the present invention, the thermal conductivity can be a value measured using the hot disk method.
- the insulating resin film refers to a film obtained by molding an organic resin having an organic skeleton and having a high molecular weight through a polymerization reaction.
- the manufacturing method include a method of applying heat at a temperature equal to or higher than the thermal softening point to soften and stretch, and a method of coating on a supporting substrate and curing by heating. Examples include PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PBT (polybutylene terephthalate), PEEK (polyetheretherketone), PPS (polyphenylene sulfide), PI (polyimide), and the like.
- polyester resin-derived materials are preferable, and more specifically, PET film is more preferable. If the film is to be used in such an environment for a long period of time, it is better to select a PPS film, a PI film, or the like from the viewpoint of heat resistance.
- the thickness of the insulating resin film is characterized by being 10 ⁇ m or more and 50 ⁇ m or less, preferably 20 ⁇ m or more and 40 ⁇ m or less. If the thickness is less than 10 ⁇ m, sufficient slidability cannot be provided. On the other hand, if it exceeds 50 ⁇ m, the heat of the exothermic electronic component cannot be efficiently transferred to the cooling component. This is because the insulating resin film generally has a low thermal conductivity and interferes with the transfer of heat, so it should be as thin as possible. However, even if it is too thin, it cannot provide sufficient slidability.
- the elastic modulus of the insulating resin film is 1 GPa or more, preferably 2 GPa or more, and more preferably 3 GPa or more.
- the upper limit is not particularly limited, it can be, for example, 10 GPa or less, preferably 7 GPa or less, and more preferably 5 GPa or less. If it is less than 1 GPa, the strength of the resin film will be insufficient, and sufficient slidability cannot be provided.
- the elastic modulus can be a value measured according to ASTM D882.
- a method of molding the thermally conductive composite sheet can be obtained, for example, by laminating an insulating resin film on the thermally conductive sheet. At that time, it is preferable to prevent an air layer from entering the interface of the insulating resin film of the thermally conductive sheet.
- an uncured thermally conductive silicone composition may be applied onto an insulating resin film and cured by heating.
- the method for molding the thermally conductive composite sheet is not particularly limited to these.
- the insulating resin film may be subjected to primer treatment or plasma treatment.
- thermally conductive silicone composition for forming the thermally conductive sheet used in the present invention is not particularly limited, it preferably contains the following components (A) to (D). Each component will be described in detail below.
- Component (A), the alkenyl group-containing organopolysiloxane, is an organopolysiloxane having two or more silicon-bonded alkenyl groups per molecule, and is the main component of the cured product of the present composition.
- the main chain basically consists of repeating diorganosiloxane units, but this may include a branched structure as part of the molecular structure, or a cyclic structure. Although it may be a solid, linear diorganopolysiloxane is preferable from the viewpoint of physical properties such as mechanical strength of the cured product.
- Alkenyl groups bonded to a silicon atom include alkenyl groups having 2 to 8 carbon atoms, such as vinyl, allyl, propenyl, isopropenyl, butenyl, hexenyl, cyclohexenyl and the like. I can give an example. Among them, a lower alkenyl group such as a vinyl group or an allyl group is preferred, and a vinyl group is particularly preferred.
- functional groups other than alkenyl groups bonded to silicon atoms include alkyl groups having 1 to 12 carbon atoms, preferably 1 to 7 carbon atoms, aryl groups having 6 to 15 carbon atoms, preferably 6 to 12 carbon atoms, and aryl groups having 7 to 12 carbon atoms. 15, preferably 7 to 12 monovalent hydrocarbon groups selected from aralkyl groups.
- alkyl groups include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, neopentyl, hexyl, heptyl, octyl, nonyl and decyl groups.
- dodecyl group and the like may also include cycloalkyl groups such as cyclopentyl group, cyclohexyl group and cycloheptyl group.
- aryl groups include phenyl, tolyl, xylyl, naphthyl, and biphenylyl groups.
- aralkyl groups include benzyl, phenylethyl, phenylpropyl, methylbenzyl and the like. Among them, preferred are a methyl group, an ethyl group, a propyl group and a phenyl group.
- all of these functional groups may be the same or different.
- the kinematic viscosity of this organopolysiloxane at 25° C. is preferably in the range of 10 to 30,000 mm 2 /s, more preferably 50 to 1,000 mm 2 /s.
- an organopolysiloxane having a kinematic viscosity within this range is used, the flowability of the obtained composition is not impaired, and the thermally conductive filler can be easily filled.
- the kinematic viscosity used herein refers to the kinematic viscosity at 25° C. measured using a Canon-Fenske viscometer according to JIS Z 8803:2011.
- the (A) component organopolysiloxane may be used singly or in combination of two or more having different viscosities.
- the organohydrogenpolysiloxane of component (B) is an organohydrogenpolysiloxane having an average of 2 or more, preferably 2 to 100, hydrogen atoms (hydrosilyl groups) directly bonded to silicon atoms in one molecule.
- (A) is a component that acts as a cross-linking agent for component (A). That is, the hydrosilyl groups in the component (B) and the alkenyl groups in the component (A) are added by a hydrosilylation reaction promoted by the platinum group metal-based curing catalyst of the component (D), which will be described later, to form a crosslinked structure. gives a three-dimensional network structure with In addition, when the number of hydrosilyl groups is less than 2, it does not cure.
- organohydrogenpolysiloxane one represented by the following average structural formula (4) is preferably used, but it is not limited to this.
- R 6 is independently a hydrogen atom or a group selected from an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 15 carbon atoms, and an aralkyl group having 7 to 15 carbon atoms; 2 or more, preferably 2 to 10, are hydrogen atoms, and e is an integer of 1 or more, preferably an integer of 10 to 200.
- the groups other than hydrogen atoms for R 6 include alkyl groups having 1 to 12 carbon atoms, preferably 1 to 7 carbon atoms, aryl groups having 6 to 15 carbon atoms, preferably 6 to 12 carbon atoms, and 7 carbon atoms. to 15, preferably 7 to 12 aralkyl groups.
- alkyl groups include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, neopentyl, hexyl, heptyl, octyl, nonyl and decyl groups.
- dodecyl group and the like may include cycloalkyl groups such as cyclopentyl group, cyclohexyl group and cycloheptyl group.
- aryl groups include phenyl, tolyl, xylyl, naphthyl, biphenylyl groups and the like.
- aralkyl groups include benzyl, phenylethyl, phenylpropyl, methylbenzyl and the like. Preferred are methyl group, ethyl group, propyl group and phenyl group.
- all R6 may be the same or different.
- the amount of component (B) added is such that the amount of hydrosilyl groups derived from component (B) is preferably 0.1 to 5.0 mol, more preferably 0.1 mol, per 1 mol of alkenyl groups derived from component (A).
- the amount is 3 to 2.0 mol, more preferably 0.5 to 1.0 mol. If the amount of hydrosilyl groups derived from component (B) is 0.1 mol or more relative to 1 mol of alkenyl groups derived from component (A), the cured product will have sufficient strength and can retain its shape as a molded product. Easier to handle. If it is 5.0 mol or less, the flexibility of the cured product is maintained and the cured product does not become brittle.
- the thermally conductive filler which is the component (C), preferably contains mainly alumina, and is composed of the following components (Ci) to (Ciii), for example.
- the average particle size is a volume-based cumulative average measured by a laser diffraction/scattering method (Microtrac method) using a Microtrac MT3300EX particle size analyzer manufactured by Microtrac Bell Co., Ltd. It is the value of particle size (median diameter).
- the (Ci) component amorphous alumina can significantly improve the thermal conductivity.
- the average particle diameter of amorphous alumina is preferably 10 to 30 ⁇ m, more preferably 15 to 25 ⁇ m. If the average particle diameter is 10 ⁇ m or more, the effect of improving the thermal conductivity is sufficiently high, and the processability is improved without increasing the viscosity of the composition. Further, when the average particle diameter is 30 ⁇ m or less, abrasion of the reactor and stirring blades is less likely to occur, and there is no risk of lowering the insulating properties of the composition.
- the (Ci) component amorphous alumina one or a combination of two or more may be used. In addition, a normal commercial item can be used for the amorphous alumina.
- the (C-ii) component, spherical alumina improves the thermal conductivity of the composition, suppresses contact between the amorphous alumina and the reaction vessel and stirring blades, and provides a barrier effect that suppresses wear of equipment.
- the average particle size is preferably 30-85 ⁇ m, more preferably 40-80 ⁇ m. If the average particle diameter is 30 ⁇ m or more, a sufficient barrier effect can be obtained, and wear of the reaction vessel and stirring blades due to the amorphous particles can be reduced. On the other hand, if the average particle size is 85 ⁇ m or less, the alumina will not precipitate in the composition and impair the uniformity of the composition.
- the spherical alumina of component (C-ii) one kind or a combination of two or more kinds may be used. In addition, the spherical alumina can use a normal commercial item.
- the insulating inorganic filler of component (C-iii) also plays a role in improving the thermal conductivity of the composition, but its main role is to adjust the viscosity of the composition, prevent sedimentation, improve smoothness, and improve fillability. . It also plays a role in coloring, improving flame retardancy, strength, and compression set.
- the filler preferably has insulating properties.
- the average particle size of the component (C-iii) is preferably 0.1 to 6 ⁇ m, more preferably 0.5 to 4 ⁇ m, in order to develop the properties described above. When the average particle diameter is 0.1 ⁇ m or more, the viscosity of the composition is sufficiently low and moldability is improved. Further, when the average particle diameter is 6 ⁇ m or less, the smoothness of the composition is not impaired and the sedimentation of the filler does not proceed rapidly, so that the thermal conductivity of the molded article and the moldability of the composition are improved.
- Examples of the insulating inorganic filler of the component (C-iii) include metal oxides other than the components (C-i) and (C-ii) such as alumina, silica, magnesia, red iron oxide, beryllia, titania, and zirconia; Metal nitrides such as aluminum nitride, silicon nitride and boron nitride, metal hydroxides such as aluminum hydroxide and magnesium hydroxide, artificial diamonds, etc. can be used. Further, one or more of these may be used in combination. In addition, a normal commercial item can be used for an insulating inorganic filler.
- the blending amount of component (Ci) is preferably 500 to 1,500 parts by mass, more preferably 700 to 1,200 parts by mass, per 100 parts by mass of component (A). If it is 500 parts by mass or more, the thermal conductivity is sufficiently improved, and if it is 1,500 parts by mass or less, the fluidity of the composition is not lost and moldability is maintained. In addition, the reaction vessel and stirring blades are less likely to be worn, and there is no fear that the insulating properties of the composition will be lowered.
- the blending amount of component (C-ii) is preferably 150 to 4,000 parts by mass, more preferably 200 to 3,000 parts by mass, per 100 parts by mass of component (A). If it is 150 parts by mass or more, the thermal conductivity is sufficiently improved, and if it is 4,000 parts by mass or less, the fluidity of the composition is not lost and moldability is maintained.
- the blending amount of component (C-iii) is preferably 500 to 2,000 parts by mass, more preferably 600 to 1,800 parts by mass, per 100 parts by mass of component (A).
- the amount is 500 parts by mass or more, the smoothness of the composition is not deteriorated, and the sedimentation of the filler does not proceed rapidly. If the amount is 2,000 parts by mass or less, the viscosity of the composition does not significantly increase, so moldability is maintained.
- the amount of component (C) (that is, the total amount of components (Ci) to (C-iii)) is 1,200 to 6,500 mass parts per 100 parts by mass of component (A). parts, more preferably 1,500 to 5,500 parts by mass.
- this amount is 1,200 parts by mass or more, the obtained composition has good thermal conductivity, does not have too low a composition viscosity, and has sufficient storage stability. If it is below, the extensibility of the composition is sufficient, the hardness is not too high, and the molded product has sufficient strength.
- the component (D) platinum group metal-based curing catalyst is a catalyst for promoting the addition reaction between the alkenyl group derived from the component (A) and the Si—H group derived from the component (B), and is used in the hydrosilylation reaction.
- a well-known catalyst is mentioned as a catalyst used.
- platinum including platinum black
- rhodium, palladium, and other platinum group metal simple substances H 2 PtCl 4 ⁇ nH 2 O, H 2 PtCl 6 ⁇ nH 2 O, NaHPtCl 6 ⁇ nH 2 O , KaHPtCl6.nH2O , Na2PtCl6.nH2O , K2PtCl4.nH2O , PtCl4.nH2O , PtCl2 , Na2HPtCl4.nH2O ( wherein , n is an integer of 0 to 6, preferably 0 or 6.), platinum chloride, chloroplatinic acid and chloroplatinate, alcohol-modified chloroplatinic acid (US Pat.
- the amount of component (D) used is preferably 0.1 to 2,000 ppm, more preferably 50 to 1,000 ppm in terms of mass of the platinum group metal element relative to component (A).
- the thermally conductive silicone composition of the present invention may further contain an addition reaction controller as component (E).
- the addition reaction inhibitor is not particularly limited, but known addition reaction inhibitors used in ordinary addition reaction curing silicone compositions can be used. Examples thereof include acetylene compounds such as 1-ethynyl-1-hexanol, 3-butyn-1-ol and ethynylmethylidene carbinol, various nitrogen compounds, organic phosphorus compounds, oxime compounds and organic chloro compounds.
- the amount used when component (E) is blended is preferably 0.01 to 1 part by mass, more preferably about 0.1 to 0.8 part by mass, per 100 parts by mass of component (A). If the blending amount is 1 part by mass or less, the curing reaction proceeds well, resulting in good molding efficiency.
- the surface of the component (C) is hydrophobized with the surface treatment agent (F).
- the surface treatment agent (F) By subjecting the component (C) to a hydrophobizing treatment, the wettability with the organopolysiloxane (A) component is improved, and the thermally conductive filler (C) component is incorporated into the matrix consisting of the component (A). It can be evenly distributed.
- the component (F) one or more selected from the group consisting of the following components (F-1) and (F-2) are particularly preferable.
- Component (F-1) is an 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 a monovalent hydrocarbon group having 1 to 12 carbon atoms, R 3 is independently a ⁇ 6 alkyl group, 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 in the general formula (1) include hexyl group, octyl group, nonyl group, decyl group, dodecyl group and tetradecyl group.
- the number of carbon atoms in the alkyl group represented by R 1 satisfies the range of 6 to 15, the wettability of the component (A) is sufficiently improved, the handleability is good, and the low-temperature properties of the composition are good. Become.
- Examples of monovalent hydrocarbon groups represented by R 2 include alkyl groups having 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms, aryl groups having 6 to 15 carbon atoms, preferably 6 to 12 carbon atoms, and Aralkyl groups of numbers 7 to 15, preferably 7 to 12 can be mentioned.
- Examples of alkyl groups include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, pentyl, neopentyl and the like.
- Examples of aryl groups include phenyl, tolyl, xylyl, naphthyl, biphenylyl groups and the like.
- aralkyl groups examples include benzyl, phenylethyl, phenylpropyl, methylbenzyl and the like. Among them, a methyl group, an ethyl group, a propyl group, and a phenyl group are preferred.
- R3 examples include methyl group, ethyl group, propyl group, butyl group and hexyl group.
- Component (F-2) is a dimethylpolysiloxane having one molecular chain end blocked with a trialkoxysilyl group represented by the following general formula (2).
- 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 in the general formula (2) are the same as the alkyl groups represented by R 3 in the general formula (1).
- c is preferably an integer of 5-70, particularly preferably 10-50.
- either one of the (F-1) component and the (F-2) component may be blended together.
- the blending amount of component (F) is preferably 0.01 to 300 parts by mass, particularly preferably 0.1 to 200 parts by mass, per 100 parts by mass of component (A). If the ratio of this component is 300 parts by mass or less, no oil separation is induced.
- the thermally conductive silicone composition used in the present invention has the following general formula (3) as the component (G) for the purpose of imparting properties such as viscosity adjustment to the thermally conductive silicone composition.
- R 5 is independently a monovalent hydrocarbon group containing no aliphatic unsaturated bonds having 1 to 12 carbon atoms, and d is an integer of 5 to 2,000.
- An organopolysiloxane having a kinematic viscosity at 23° C. of 10 to 100,000 mm 2 /s can be added.
- Component may be used individually by 1 type, or may use 2 or more types together.
- R 5 is independently a monovalent hydrocarbon group containing no aliphatic unsaturated bond and having 1 to 12 carbon atoms.
- R5 include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert - butyl, pentyl, neopentyl, hexyl, heptyl, octyl, nonyl, and decyl groups.
- dodecyl group and other alkyl groups dodecyl group and other alkyl groups, cyclopentyl group, cyclohexyl group, cycloheptyl group and other cycloalkyl groups, phenyl group, tolyl group, xylyl group, naphthyl group, biphenylyl group and other aryl groups, benzyl group, phenylethyl group, phenylpropy and aralkyl groups such as methylbenzyl group, typical ones having 1 to 10 carbon atoms, particularly typical ones having 1 to 6 carbon atoms, preferably methyl group, Examples thereof include alkyl groups having 1 to 3 carbon atoms such as ethyl group and propyl group, and phenyl groups, with methyl group and phenyl group being particularly preferred.
- d is preferably an integer of 5 to 2,000, and particularly preferably an integer of 10 to 1,000.
- the kinematic viscosity of component (G) at 23° C. is preferably 10 to 100,000 mm 2 /s, particularly preferably 100 to 10,000 mm 2 /s.
- the kinematic viscosity is 10 mm 2 /s or more, the resulting cured product of the composition is less prone to oil bleeding.
- the resulting thermally conductive silicone composition retains sufficient flexibility.
- the amount of addition is not particularly limited as long as the desired effect can be obtained. is 0.1 to 100 parts by mass, more preferably 1 to 50 parts by mass. When the amount is within this range, the thermally conductive silicone composition before curing can easily maintain good fluidity and workability, and the thermally conductive filler of component (C) is filled into the composition. is easy.
- the present invention provides a method for mounting a heat-generating electronic component in which the heat-generating electronic component is fixed after sliding the heat-generating electronic component on the insulating resin film of the thermally conductive composite sheet to align it with the target position. offer.
- thermally conductive sheets and insulating resin films used in Examples and Comparative Examples are shown below.
- thermal conductive sheet 5 TC-80TA-1 manufactured by Shin-Etsu Chemical Co., Ltd., 0.8 mm thick, 1 W / mK, Asker C hardness 90, tack force 10 gf (0.098 N)
- Components (A) to (G) of the composition of the thermally conductive sheet 4 are as follows.
- A) Organopolysiloxane having a kinematic viscosity of 600 mm 2 /s represented by the following formula (5): 100 parts by mass (In the formula, f is a number that satisfies the above kinematic viscosity value)
- B) Organohydrogenpolysiloxane represented by the following formula (6): 11 parts by mass C)
- thermal conductivity The obtained composition was cured into a sheet with a thickness of 6 mm. The thermal conductivity of the sheet was measured. Hardness: The resulting composition was cured into a sheet having a thickness of 6 mm.
- Lumirror S10 manufactured by Toray, PET, thickness: 38 ⁇ m, elastic modulus: 4.7 GPa
- 2 Lumirror S10 manufactured by Toray, PET, thickness: 24 ⁇ m, elastic modulus: 4.7 GPa
- 3 Apical manufactured by Kaneka, PI, thickness: 24 ⁇ m, elastic modulus: 3.2 GPa
- 4 Kapton manufactured by Toray DuPont, PI, thickness: 7.5 ⁇ m, elastic modulus: 3.1 GPa
- 5 TC-20TA-1 manufactured by Shin-Etsu Chemical Co., Ltd., thermally conductive silicone rubber, thickness: 0.2 mm, elastic modulus: 13 MPa
- 6 Torayfan manufactured by Toray, polypropylene, thickness: 30 ⁇ m, elastic modulus: 0.15 GPa
- 7 Lumirror S10 manufactured by Toray, PET, thickness: 38 ⁇ m, elastic modulus: 4.7 GPa
- 3 Apical manufactured by Kaneka
- PI thickness: 24 ⁇ m
- thermally conductive composite sheet was formed by laminating a thermally conductive sheet and an insulating resin film in the combinations shown in Table 1 below.
- the molding method of the thermally conductive composite sheet is as follows.
- Method 1 for molding thermally conductive composite sheet A 2 kg rubber roller was moved at 0.5 m/min from the end of the insulating resin film to one side of the thermally conductive sheet to bond the thermally conductive sheet and the insulating resin film without gaps. This method was applied to the examples using the thermally conductive sheets 1 to 3 and 5 above.
- Thermal resistance increase value The difference between the thermal resistance of the thermally conductive sheet and the thermally conductive composite sheet laminated with the insulating resin film.
- the measurement method conforms to ASTM D5470, and the measurement conditions are 50° C./40 psi.
- Examples 1 to 7 using the thermally conductive composite sheet of the present invention exhibit excellent slidability without tearing of the sheet or film. It was confirmed that it can be preferably used.
- Comparative Example 1 when the insulating resin film was not combined, the sheet was sticky and the sheet was torn, resulting in failure in slidability.
- Comparative Example 2 since the insulating resin film was too thin, the film was torn.
- Comparative Example 3 the elastic modulus of the silicone rubber was insufficient, and TC-20TA-1 was torn.
- Comparative Example 4 the polypropylene film having a low elastic modulus was stretched and then torn, resulting in failure in slidability.
- Comparative Example 5 since the hardness of the thermally conductive sheet was high and the tack strength was not sufficient, the insulating resin film was peeled off.
- Comparative Example 6 Although insulating resin films were laminated on both sides of the thermally conductive sheet, they could not be attached onto the aluminum plate, and the slidability evaluation itself could not be carried out. In Comparative Example 7, although a thick insulating resin film was used, the slidability test was passed, but the increase in thermal resistance was large.
- the present invention is not limited to the above embodiments.
- the above-described embodiment is an example, and any device having substantially the same configuration as the technical idea described in the claims of the present invention and exhibiting the same effect is the present invention. included in the technical scope of
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Abstract
Description
熱伝導性複合シートであって、
硬さがアスカーC硬度30以下、表面タック力が30gf(0.294N)以上、及び厚さ0.3mm以上で熱伝導率が0.8W/mK以上であり、オルガノポリシロキサンエラストマーと熱伝導性充填材を含む熱伝導性シートと、該熱伝導性シートの片面に、厚さ10μm以上50μm以下であり弾性率が1GPa以上の絶縁性樹脂フィルムとを積層してなるものである熱伝導性複合シートを提供する。
(A)1分子中に2個以上のアルケニル基を有するオルガノポリシロキサン:100質量部、
(B)ケイ素原子に直接結合した水素原子を2個以上有するオルガノハイドロジェンポリシロキサン:前記ケイ素原子に直接結合した水素原子のモル数が前記(A)成分由来のアルケニル基のモル数の0.1~5.0倍となる量、
(C)熱伝導性充填材:1,200~6,500質量部、
(D)白金族金属系硬化触媒:前記(A)成分に対して白金族金属元素質量換算で0.1~2,000ppm
を含有する熱伝導性シリコーン組成物の硬化物であることが好ましい。
(C-i)平均粒径10~30μmである不定形アルミナ:500~1,500質量部、
(C-ii)平均粒径30~85μmである球状アルミナ:150~4,000質量部、
(C-iii)平均粒径0.1~6μmである絶縁性無機フィラー:500~2,000質量部
の3種からなるものであることが好ましい。
(F-1)下記一般式(1)
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は独立に炭素原子数1~12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。)
で表されるアルコキシシラン化合物、及び
(F-2)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シリル基で封鎖されたジメチルポリシロキサンからなる群から選ばれる1種以上
で処理されたものであることが好ましい。
熱伝導性複合シートであって、
硬さがアスカーC硬度30以下、表面タック力が30gf(0.294N)以上、及び厚さ0.3mm以上で熱伝導率が0.8W/mK以上であり、オルガノポリシロキサンエラストマーと熱伝導性充填材を含む熱伝導性シートと、該熱伝導性シートの片面に、厚さ10μm以上50μm以下であり弾性率が1GPa以上の絶縁性樹脂フィルムとを積層してなるものである熱伝導性複合シートである。
本発明の熱伝導性複合シートは、例えば図1のように示されるものである。図1において、熱伝導性複合シート1は、絶縁性樹脂フィルム2が熱伝導性シート3の片面に積層されたものである。熱伝導性シート3は熱伝導性複合シート1に熱伝導性を与える役割を持つ。絶縁性樹脂フィルム2は絶縁性樹脂フィルム2が積層された面に摺動性を与える役割を持つ。
熱伝導性シートとしては硬さ、表面タック力、厚さ、熱伝導性が下記の範囲内であれば特に限定されないが、例えば後述の熱伝導性シリコーン組成物をシート状にして硬化させて得られる硬化物とすることができる。また、市販の熱伝導性シートを使用することもできる。
熱伝導性シートの硬さはJIS K 7312:1996 附属書2記載の方法で測定したアスカーC硬度計で30以下であることを特徴とし、好ましくは20以下である。硬さの下限は特に限定されないが、好ましくは1以上、より好ましくは5以上とすることができる。硬さが30を超えると、発熱性電子部品を熱伝導性シートに固定する際に圧縮しづらくなり、発熱性電子部品に応力が掛かり破損の原因となる。
熱伝導性シートの厚さは0.3mm以上であることを特徴とし、好ましくは0.4mm以上である。厚さの上限は特に限定されないが、例えば5mm以下、好ましくは3mm以下、より好ましくは2mm以下とすることができる。0.3mm未満だと上述のように電子部品の公差が吸収できない場合が多くなる。
熱伝導性シートの表面タック力は30gf(0.294N)以上であることを特徴とし、好ましくは60gf(0.588N)以上である。タック力の上限は特に限定されないが、好ましくは500gf(4.903N)以下、より好ましくは200gf(1.961N)以下、更に好ましくは100gf(0.981N)以下の値とすることができる。30gf(0.294N)未満だと、被着体と十分に密着させることが難しくなる上、絶縁性樹脂フィルムと積層させる場合にも剥がれやすくなるためである。本発明においては、タック力はタッキネステスター(マルコム製)で定圧侵入方式を用いて測定した値とすることができる。
熱伝導性シートの熱伝導率は0.8W/mK以上である。好ましくは1.5W/mK以上、より好ましくは3.0W/mK以上である。熱伝導率の上限は特に限定されないが、例えば10W/mK以下、好ましくは5W/mK以下とすることができる。熱伝導率が0.8W/mK未満だと発熱性電子部品から発生した熱を効率的に冷却部材に伝えることができない。本発明においては、熱伝導率はホットディスク法を用いて測定した値とすることができる。
絶縁性樹脂フィルムは、有機骨格を持ち、重合反応によって高分子量化した、有機樹脂をフィルム状に成型したものを指す。製造方法は、熱軟化点以上で熱を掛けて軟化させ引き延ばす方法や、支持基材上で塗布し加熱硬化させる方法などが挙げられる。例えばPET(ポリエチレンテレフタレート)やPEN(ポリエチレンナフタレート)、PBT(ポリブチレンテレフタレート)、PEEK(ポリエーテルエーテルケトン)、PPS(ポリフェニレンサルファイド)、PI(ポリイミド)などが挙げられる。
絶縁性樹脂フィルムの厚さは10μm以上50μm以下であることを特徴とし、好ましくは20μm以上40μm以下である。厚さが10μm未満だと十分な摺動性が与えられない。一方50μmを超える場合、発熱性電子部品の熱を効率的に冷却部品に伝えることができない。というのも絶縁性樹脂フィルムは一般的に熱伝導率が低く、熱の伝達の妨げとなるため、出来るだけ薄い方がよい。しかしながら薄すぎても十分な摺動性を与えることができない。
絶縁性樹脂フィルムの弾性率は、1GPa以上であり、好ましくは2GPa以上であり、より好ましくは3GPa以上である。上限は特に限定されないが、例えば10GPa以下、好ましくは7GPa以下、より好ましくは5GPa以下とすることができる。1GPa未満であると樹脂フィルムの強度が不足し、十分な摺動性を与える事はできない。本発明においては、弾性率は、ASTM D882に準拠し測定した値とすることができる。
熱伝導性複合シートの成型方法は、例えば熱伝導性シート上に絶縁性樹脂フィルムを積層することで得られる。その際には熱伝導性シートの絶縁性樹脂フィルムの界面に空気層が混入しないようにすることが好ましい。他には絶縁性樹脂フィルム上に未硬化の熱伝導性シリコーン組成物を塗布して、加熱硬化させる方法であってもよい。しかし熱伝導性複合シートの成型方法は特にこれらに限定されるものではない。また熱伝導性シートと絶縁性樹脂フィルムの密着性を向上させるために、絶縁性樹脂フィルム上にプライマー処理やプラズマ処理を施してもよい。
本発明に用いられる熱伝導性シートを形成するための熱伝導性シリコーン組成物は、特に限定されないが以下の(A)~(D)成分を含むものであることが好ましい。以下、各成分について詳細を述べる。
(A)成分であるアルケニル基含有オルガノポリシロキサンは、ケイ素原子に結合したアルケニル基を1分子中に2個以上有するオルガノポリシロキサンであり、本組成物の硬化物の主剤となるものである。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。
(B)成分のオルガノハイドロジェンポリシロキサンは、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(ヒドロシリル基)を有するオルガノハイドロジェンポリシロキサンであり、(A)成分の架橋剤として作用する成分である。即ち、(B)成分中のヒドロシリル基と(A)成分中のアルケニル基とが、後述する(D)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。なお、ヒドロシリル基の数が2個未満の場合、硬化しない。
(C)成分である熱伝導性充填材は、主にアルミナを含有するものであることが好ましく、例えば、下記(C-i)~(C-iii)成分からなるものである。
(C-i)平均粒径10~30μmである不定形アルミナ、
(C-ii)平均粒径30~85μmである球状アルミナ、
(C-iii)平均粒径0.1~6μmである絶縁性無機フィラー
(D)成分の白金族金属系硬化触媒は、(A)成分由来のアルケニル基と、(B)成分由来のSi-H基の付加反応を促進するための触媒であり、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。
本発明の熱伝導性シリコーン組成物には、更に(E)成分として付加反応制御剤を使用することができる。付加反応制御剤は、特に限定されないが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用いることができる。例えば、1-エチニル-1-ヘキサノール、3-ブチン-1-オール、エチニルメチリデンカルビノ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。
また、前記(C)成分は、(F)表面処理剤によって表面を疎水化処理していることが好ましい。(C)成分を疎水化処理することにより、(A)成分であるオルガノポリシロキサンとの濡れ性を向上させ、(C)成分である熱伝導性充填材を(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ができる。前記(F)成分としては、特に下記に示す(F-1)成分及び(F-2)成分からなる群から選ばれる1種以上が好ましい。
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は独立に炭素原子数1~12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。)
本発明で用いられる熱伝導性シリコーン組成物には、熱伝導性シリコーン組成物の粘度調整等の特性付与を目的として、(G)成分として、下記一般式(3)
で表される23℃における動粘度が10~100,000mm2/sのオルガノポリシロキサンを添加することができる。(G)成分は、1種単独で用いても、2種以上を併用してもよい。
また、本発明は熱伝導性複合シートの前記絶縁性樹脂フィルム上で発熱性電子部品を滑らせて目的の位置に合わせた後に、上記発熱性電子部品を固定する発熱性電子部品の実装方法を提供する。
1 TC-100CAD-10(信越化学工業製、1mm厚、3.2W/mK、アスカーC硬度10、タック力85gf(0.834N))
2 TC-100CAS-10(信越化学工業製、1mm厚、1.8W/mK、アスカーC硬度10、タック力94gf(0.922N))
3 TC-50CAD-10(信越化学工業製、0.5mm厚、3.2W/mK、アスカーC硬度10、タック力90gf(0.883N))
4 以下に示す組成物を下記熱伝導性複合シートの成型方法2で硬化させて得られるシートであり、熱伝導率3.2W/mK、アスカーC硬度10、タック力90gf(0.883N)の1mm厚の熱伝導性シート
5 TC-80TA-1(信越化学工業製、0.8mm厚、1W/mK、アスカーC硬度90、タック力10gf(0.098N))
A)下記式(5)に示す、動粘度600mm2/sであるオルガノポリシロキサン:100質量部
(式中、fは上記動粘度の値を満たす数である)
B)下記式(6)で示すオルガノハイドロジェンポリシロキサン:11質量部
C-1)平均粒径が1μmの不定形アルミナ:230質量部
C-2)平均粒径が5μmの不定形アルミナ:470質量部
C-3)平均粒径が20μmの不定形アルミナ:800質量部
C-4)平均粒径が45μmの球状アルミナ:120質量部
C-5)平均粒径が70μmの球状アルミナ120質量部
D)5質量%塩化白金酸2-エチルヘキサノール溶液:1質量部
E)エチニルメチリデンカルビノール:0.4質量部
F)下記式(7)で示されるオルガノポリシロキサン:40質量部
G)下記式(8)示されるオルガノポリシロキサン:15質量部
[評価方法]
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。
1 ルミラーS10(東レ製、PET、厚さ:38μm、弾性率:4.7GPa)
2 ルミラーS10(東レ製、PET、厚さ:24μm、弾性率:4.7GPa)
3 アピカル(カネカ製、PI、厚さ:24μm、弾性率:3.2GPa)
4 カプトン(東レ・デュポン製、PI、厚さ:7.5μm、弾性率:3.1GPa)
5 TC-20TA-1(信越化学工業製、熱伝導性シリコーンゴム、厚さ:0.2mm、弾性率:13MPa)
6 トレファン(東レ製、ポリプロピレン、厚さ:30μm、弾性率:0.15GPa)
7 ルミラーS10(東レ製、PET、厚さ:50μm、弾性率:4.7GPa)
8 カプトン(東レ・デュポン製、PI、厚さ:12.5μm、弾性率:3.1GPa)
9 ルミラーS10(東レ製、PET、厚さ:75μm、弾性率:4.7GPa)
下記表1に示す組み合わせで熱伝導性シートと絶縁性樹脂フィルムを積層して熱伝導性複合シートを形成した。熱伝導性複合シートの成型方法は以下の通りである。
熱伝導性シートの片面に、絶縁性樹脂フィルムを端部から2kgのゴムローラーを0.5m/minで動かし、熱伝導性シートと絶縁性樹脂フィルムを隙間なく貼り合わせた。この手法は上記熱伝導性シート1~3、5を用いた例で適用した。
未硬化のシリコーンポリマーと熱伝導性充填剤からなる組成物を絶縁性樹脂フィルム上にコンマコーターで塗布し、120℃、20分かけて硬化させた。この手法は上記熱伝導シート4を用いた例で適用した。
摺動性:十分大きなアルミ板上に熱伝導性複合シート200×500mmサイズを2kgゴムローラーで0.5m/minの速さで貼り合わせたのち、絶縁性樹脂フィルム上に幅200mm、長さ40mm、高さ150mm、重さ2kgのステンレスの塊を1m/minの速さで500mm移動させたときに、シートの破れ、剥がれがあるかどうかを確認した。シートに破れ、剥がれがおこらなければ合格、シートに破れ剥がれが起こった場合は、不合格とした。
熱抵抗上昇値:熱伝導性シートの熱抵抗と絶縁性樹脂フィルムを積層させた熱伝導性複合シートの熱抵抗の差とする。測定方法はASTM D5470に準拠し、測定条件は50℃/40psiとする。
Claims (8)
- 熱伝導性複合シートであって、
硬さがアスカーC硬度30以下、表面タック力が30gf(0.294N)以上、及び厚さ0.3mm以上で熱伝導率が0.8W/mK以上であり、オルガノポリシロキサンエラストマーと熱伝導性充填材を含む熱伝導性シートと、該熱伝導性シートの片面に、厚さ10μm以上50μm以下であり弾性率が1GPa以上の絶縁性樹脂フィルムとを積層してなるものであることを特徴とする熱伝導性複合シート。 - 前記絶縁性樹脂フィルムがポリエステル樹脂フィルムであることを特徴とする請求項1に記載の熱伝導性複合シート。
- 前記熱伝導性シートの熱伝導率が3.0W/mK以上であることを特徴とする請求項1又は請求項2に記載の熱伝導性複合シート。
- 前記熱伝導性シートが、下記(A)~(D)成分
(A)1分子中に2個以上のアルケニル基を有するオルガノポリシロキサン:100質量部、
(B)ケイ素原子に直接結合した水素原子を2個以上有するオルガノハイドロジェンポリシロキサン:前記ケイ素原子に直接結合した水素原子のモル数が前記(A)成分由来のアルケニル基のモル数の0.1~5.0倍となる量、
(C)熱伝導性充填材:1,200~6,500質量部、
(D)白金族金属系硬化触媒:前記(A)成分に対して白金族金属元素質量換算で0.1~2,000ppm
を含有する熱伝導性シリコーン組成物の硬化物であることを特徴とする請求項1から請求項3のいずれか一項に記載の熱伝導性複合シート。 - 前記(C)成分の熱伝導性充填材が、
(C-i)平均粒径10~30μmである不定形アルミナ:500~1,500質量部、
(C-ii)平均粒径30~85μmである球状アルミナ:150~4,000質量部、
(C-iii)平均粒径0.1~6μmである絶縁性無機フィラー:500~2,000質量部
の3種からなるものであることを特徴とする請求項4に記載の熱伝導性複合シート。 - 前記(C)成分が、下記(F)表面処理剤
(F-1)下記一般式(1)
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は独立に炭素原子数1~12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。)
で表されるアルコキシシラン化合物、及び
(F-2)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シリル基で封鎖されたジメチルポリシロキサンからなる群から選ばれる1種以上
で処理されたものであることを特徴とする請求項4又は請求項5に記載の熱伝導性複合シート。 - 前記(F)成分の配合量が前記(A)成分100質量部に対し0.01~300質量部であることを特徴とする請求項6に記載の熱伝導性複合シート。
- 請求項1から請求項7のいずれか一項に記載の熱伝導性複合シートの前記絶縁性樹脂フィルム上で発熱性電子部品を滑らせて目的の位置に合わせた後に、前記発熱性電子部品を固定することを特徴とする発熱性電子部品の実装方法。
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JP2019071380A (ja) | 2017-10-11 | 2019-05-09 | 信越化学工業株式会社 | 熱伝導性複合シート及びその製造方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN116376028A (zh) * | 2023-05-22 | 2023-07-04 | 江苏至昕新材料有限公司 | 一种粉料表面处理剂及其制备方法与应用 |
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JP2022165108A (ja) | 2022-10-31 |
EP4328019A1 (en) | 2024-02-28 |
TW202241703A (zh) | 2022-11-01 |
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CN117157193A (zh) | 2023-12-01 |
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