WO2020203299A1 - 多成分型熱伝導性シリコーンゲル組成物、熱伝導性部材および放熱構造体 - Google Patents
多成分型熱伝導性シリコーンゲル組成物、熱伝導性部材および放熱構造体 Download PDFInfo
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- WO2020203299A1 WO2020203299A1 PCT/JP2020/012000 JP2020012000W WO2020203299A1 WO 2020203299 A1 WO2020203299 A1 WO 2020203299A1 JP 2020012000 W JP2020012000 W JP 2020012000W WO 2020203299 A1 WO2020203299 A1 WO 2020203299A1
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- component
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- silicone gel
- conductive silicone
- composition
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- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
- CPUDPFPXCZDNGI-UHFFFAOYSA-N triethoxy(methyl)silane Chemical compound CCO[Si](C)(OCC)OCC CPUDPFPXCZDNGI-UHFFFAOYSA-N 0.000 description 1
- JXUKBNICSRJFAP-UHFFFAOYSA-N triethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCOCC1CO1 JXUKBNICSRJFAP-UHFFFAOYSA-N 0.000 description 1
- LFRDHGNFBLIJIY-UHFFFAOYSA-N trimethoxy(prop-2-enyl)silane Chemical compound CO[Si](OC)(OC)CC=C LFRDHGNFBLIJIY-UHFFFAOYSA-N 0.000 description 1
- HQYALQRYBUJWDH-UHFFFAOYSA-N trimethoxy(propyl)silane Chemical compound CCC[Si](OC)(OC)OC HQYALQRYBUJWDH-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
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- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/205—Compounding polymers with additives, e.g. colouring in the presence of a continuous liquid phase
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
- C08J3/241—Preventing premature crosslinking by physical separation of components, e.g. encapsulation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/14—Peroxides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/16—Solid spheres
- C08K7/18—Solid spheres inorganic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
- H01L23/3737—Organic materials with or without a thermoconductive filler
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/12—Polysiloxanes containing silicon bound to hydrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
- C08G77/18—Polysiloxanes containing silicon bound to oxygen-containing groups to alkoxy or aryloxy groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2383/00—Characterised by the use 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; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2483/00—Characterised by the use 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; Derivatives of such polymers
- C08J2483/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Definitions
- the present invention has excellent extrudability and mixing stability while having high thermal conductivity, and each liquid (composition) is difficult to separate even in a package of a multi-component type composition such as a two-component type, and can be stored stably.
- the present invention relates to a heat conductive silicone gel composition which can be used and has excellent gap fill property and, if desired, repair property for heat radiating parts, a heat conductive member made of the same, and a heat radiating structure using the same.
- thermally conductive silicone composition composed of an organopolysiloxane and a thermally conductive filler such as aluminum oxide powder and zinc oxide powder is widely used.
- a heat conductive silicone composition packed with a large amount of heat conductive filler has been proposed in order to cope with a high heat dissipation amount.
- Patent Document 1 and Patent Document 2 the surface of the thermally conductive filler is treated with a hydrolyzable silane having a long-chain alkyl group to heat these thermally conductive silicone compositions. Even if the conductive inorganic filler is highly filled, the molded product is given flexibility and heat-resistant mechanical properties, and the increase in viscosity is reduced to improve the moldability, and the thermally conductive silicone has high thermal conductivity. It has been proposed that the composition is feasible. Further, Patent Document 3 describes a thermally conductive silicone composition containing a thermally conductive filler surface-treated with two or more kinds of treating agents having different molecular weights, and by changing the timing of adding the treating agent. It has been proposed that the fluidity of the compound is not impaired even if the heat conductive filler is highly filled.
- thermally conductive silicone compositions have a certain decrease in viscosity and improvement in moldability, their fluidity is insufficient, so that they are highly refined electrical and electronic materials.
- a composition containing an organohydrogenpolysiloxane as a cross-linking agent and a composition not containing the cross-linking agent are distributed in different packages that are individually stored and mixed at the time of use.
- the form of the multi-component composition is known, the above-mentioned Patent Documents 1 to 3 do not disclose the multi-component heat conductive silicone composition, and in particular, organohydrogenpoly which is a cross-linking agent.
- no stable multi-component thermally conductive silicone composition is known.
- JP-A-11-209618A Japanese Unexamined Patent Publication No. 2000-001616 Japanese Unexamined Patent Publication No. 2005-162975
- the present inventors have found new problems.
- a high heat dissipation region of 2.0 W / mK or more In the composition of, it is necessary that the content of the heat conductive filler is extremely high.
- the viscosities of the compositions constituting the multi-components and the content of the heat conductive filler are significantly different, it becomes difficult to extrude the compositions during use and to uniformly mix the compositions in the mixer.
- the present invention has been made to solve the above problems, has a high thermal conductivity of 2.0 W / mK or more, and has a composition after mixing even when the thermally conductive inorganic filler is highly filled.
- each liquid (composition) especially in the package of a multi-component composition such as a two-component type, has excellent precision coating property and gap fill property for electronic parts having many gaps.
- the composition containing the low-viscosity organopolysiloxane that imparts fluidity is difficult to separate, and when mixed with a static mixer, heterogeneous curing is caused by the separation of the organopolysiloxane and poor catalytic dispersion for the hydrosilylation reaction.
- the present inventors have a composition containing a large amount of a heat conductive filler in order to give high thermal conductivity, and the same system as the organopolysiloxane of the main component (A-1). It was designed so that the organopolysiloxane of the component (A-2) was contained therein in a range in which the viscosity of these mixed polymers was 1.15 to 5.5 times the viscosity of the component (A-1) at 25 ° C.
- We have found that the above-mentioned problems can be solved by a multi-component heat conductive silicone gel composition, and have reached the present invention.
- the object of the present invention is (A) An alkenyl group-containing organopolysiloxane composed of the following components (A-1) and component (A-2) (A-1) An alkenyl group-containing organopolysiloxane having a degree of polymerization in the range of 5 to 100. (A-2) An alkenyl group-containing organopolysiloxane having a siloxane polymerization degree of 400 or more. , (B) Organohydrogenpolysiloxane: An amount of 0.2 to 5 mol of silicon atom-bonded hydrogen atom in the component (B) with respect to 1 mol of the alkenyl group contained in the component (A).
- (D) Thermally conductive filler It consists of liquids (I) and (II) containing (E) one or more silane coupling agents or hydrolyzed condensates thereof, and (F) an organopolysiloxane having a hydrolyzable silyl group at the end of the molecular chain.
- (I) The content of the component (D) in the liquid is 600 to 3,500 parts by mass with respect to 100 parts by mass of the component (A-1).
- the content of the component (D) in the liquid is 600 to 3,500 parts by mass with respect to 100 parts by mass of the component (A-1), and The component (A-1) and the component (A-2) are present in the same system, and the viscosity of the mixed polymer at 25 ° C. is 1.15 to 5.5, which is the viscosity of the component (A-1) at 25 ° C. It is solved by a multi-component heat conductive silicone gel composition, which is within the double range.
- the viscosity of the above component (A-1) at 25 ° C. is in the range of 10 to 100 mPa ⁇ s
- the viscosity of the above component (A-2) at 25 ° C. is 10,000 mPa ⁇ s or more.
- the component (A-1) and the component (A-2) are present in the same system, and the viscosity of these mixed polymers at 25 ° C. is within the range of 1.2 to 2.0 times that of the component (A-1). Is particularly preferable.
- the content of the component (D) in the above solutions (I) and (II) is in the range of 80 to 98% by mass of the entire composition, and the component (D).
- the composition has a thermal conductivity of 2.0 W / mK or more, preferably 3.5 W / mK or more, and more preferably 4.0 W / mK or more.
- an object of the present invention is that the above-mentioned component (E) contains an alkoxysilane having an alkyl group having 6 or more carbon atoms in the molecule (E1), and the above-mentioned component (D) is a component (D). It is preferably solved when the surface is treated with E) and the component (F). Further, the surface treatment by the component (E) and the component (F) is a heated surface treatment, and the component (E1) is a trialkoxysilane having an alkyl group having 6 to 18 carbon atoms. More preferred.
- the surface treatment of the component (E) and the component (D) in the above liquids (I) and (II) is mainly composed of the component (E) and the surface treatment of the component (D). It is particularly preferable that the surface treatment of the component (D) is performed with the component (F) as the main component.
- the component (F) is preferably The multi-component according to any one of claims 1 to 3, wherein the component (F) is an organopolysiloxane represented by the following general formula (1) or general formula (2), or a mixture thereof. Molded thermally conductive silicone gel composition.
- Organopolysiloxane which is represented by (b is an integer of 1 to 3) and has a viscosity at 25 ° C.
- the component (B) (B1) has a viscosity of 1 to 1,000 mPa ⁇ s at 25 ° C., and an average of 2 to 4 hydrogen atom-bonded hydrogen atoms in the molecule. Containing a linear organohydrogenpolysiloxane having at least two of them in the side chain of the molecular chain, the silicon atom-bonded hydrogen atom ([H B1 ) in the component (B1) in the composition.
- the object of the present invention is further preferably solved by a heat conductive silicone gel composition containing (G) a heat resistance imparting agent.
- an object of the present invention is that the component (D) is (D1) a plate-shaped boron nitride powder having an average particle size of 0.1 to 150 ⁇ m, and (D2) an average particle size of 0.1 to 500 ⁇ m.
- a multi-component heat conductive silicone gel composition which is a mixture of two or more kinds of graphite having a size of about 50 ⁇ m.
- an object of the present invention is suitably solved by a heat conductive member made of these multi-component heat conductive silicone gel compositions, particularly a heat conductive member made by curing the composition. Further, the heat dissipation structure provided with these heat conductive members preferably solves the problem.
- an object of the present invention is to provide a heat radiating structure in which a heat radiating component or a circuit board on which the heat radiating component is mounted is provided with a heat radiating member via the multi-component heat conductive silicone gel composition or a cured product thereof. , Suitable solution.
- the heat radiation structure is not particularly limited, but is preferably an electric / electronic device such as an electric / electronic component or a secondary battery, and a desired BLT (Bond Line Thickness) is designed and applied to a fine heat radiation structure. You may.
- an electric / electronic device such as an electric / electronic component or a secondary battery
- a desired BLT Bending Line Thickness
- the composition has a high thermal conductivity of 3.5 W / mK or more, and even when the thermally conductive inorganic filler is highly filled, a gap is provided so that the entire composition after mixing maintains high fluidity.
- Each liquid (composition), especially a low-viscosity organopolysiloxane that imparts fluidity, can be used even in a package of a multi-component composition such as a two-component type, while having excellent precision coating property and gap fill property for electronic parts and the like.
- a multi-component thermally conductive silicone that is difficult to separate and can prevent heterogeneous curing caused by the separation of the organopolysiloxane and poor catalytic dispersion for the hydrosilylation reaction when mixed with a static mixer.
- a gel composition is provided. Further, since the obtained thermally conductive cured product is a soft gel composition, it is possible to prevent damage to the member by relaxing the stress generated by the difference in the coefficient of thermal expansion between the electronic component and the heat radiating structure. In addition, it is possible to design a composition in which the obtained thermally conductive cured product has high peelability and excellent repairability of electronic components.
- the heat conductive member using the heat conductive silicone gel composition and the heat radiation structure using the member are included.
- a heat dissipation structure for electrical and electronic equipment can be provided.
- A An alkenyl group-containing organopolysiloxane composed of the following components (A-1) and component (A-2)
- A-1 An alkenyl group-containing organopolysiloxane having a degree of polymerization in the range of 5 to 100.
- A-2) An alkenyl group-containing organopolysiloxane having a siloxane polymerization degree of 400 or more.
- the component (A-1) is preferably an alkenyl group-containing organopolysiloxane having a viscosity at 25 ° C.
- the component (A-2) is preferably a viscosity at 25 ° C.
- each composition stored individually needs to contain the above-mentioned component (A), component (B) component and component (C) at the same time. This is because when the component (A), the component (B) component and the component (C) are mixed at the same time, the cross-linking reaction starts spontaneously, the storage stability of the composition is lost in a short period of time, and the multi-component composition This is because the desired long-term storage stability and handling workability cannot be achieved.
- the inclusion of at least liquids (I) and (II) is a composition that is stored separately and comprises a plurality of compositions containing at least two different compositions as defined below. It means that the composition is a multi-component type composition, and is not particularly limited as long as it is composed of two or more individually stored compositions. It is preferable that these components are packaged in a container when they are individually stored, and when used, they are stirred in a common container using mechanical force such as a mixer, or a dispenser that supports mixing of multiple components. Etc. are mixed and applied or applied.
- the multi-component heat conductive silicone gel composition of the present invention is substantially composed of the following liquids (I) and (II). It is preferably a two-component heat conductive silicone gel composition.
- the liquid (I) is a composition containing an alkenyl group-containing organopolysiloxane which is the main component of the present composition, and the above-mentioned components (A-1), (A-2), (C), (D), and so on. It is necessary that the composition contains (E) and (F) and does not contain the component (B), and may optionally contain the component (G) or other components.
- the liquid (II) is a composition containing an organohydrogenpolysiloxane, which is a cross-linking agent of the present composition, and is a component (A-1), (A-2), (B), (D). , (E) and (F), and the composition does not contain the component (C), and may optionally contain the component (G) or other components. Further, the components (A-1) and (A-2) may be optionally not included.
- the composition of the present invention contains a large amount of a heat conductive filler as a whole, and these liquids (I) and (II) contain both liquids.
- the content of the component (D) is preferably in the range of 80 to 98% by mass of the entire composition.
- the composition as a whole contains a large amount of the heat conductive filler, and the thermal conductivity of the composition is 2. It may be difficult to design a composition having a composition of 0.0 W / mK or more, preferably 3.5 W / mK or more, and more preferably 4.0 W / mK or more. Furthermore, when only the content of the thermally conductive filler in the liquid (II) is reduced, the viscosity and liquid properties of the compositions of the liquid (I) and the liquid (II) are extremely different, resulting in a large number of components. As a type thermally conductive silicone gel composition, it becomes difficult to uniformly mix the composition by a simple method such as a mixer or a dispenser at the time of use, which may result in significantly inferior handling workability.
- the multi-component heat conductive silicone gel composition according to the present invention contains a large amount of heat conductive filler as the whole composition and as each of the above liquids (I) and (II). It is possible to design the composition to be used, and it is possible to realize long-term storage stability without impairing the thermal conductivity and handling workability of the entire composition.
- the multi-component heat conductive silicone gel composition according to the present invention when the above solutions (I) and (II) are mixed with a static mixer or the like, poor dispersion of the components does not occur, so that after mixing, Excellent precision coating and gap fillability for electronic parts with many gaps so that the entire composition can maintain stable and high fluidity, and if desired, the viscosity and thixotropy of the composition before curing and after mixing. It is possible to adjust the peelability, repairability, etc. of the thermally conductive silicone gel after curing, and it is possible to design a composition with excellent vertical retention during coating and repairability of the silicone gel.
- the multi-component heat conductive silicone gel composition of the present invention is used by mixing a plurality of individually stored compositions containing the liquid (I) and the liquid (II) in its use. ..
- each component of the multi-component heat conductive silicone gel composition is introduced into a mechanical mixing device (for example, a general-purpose mixer such as a static mixer) from a storage container using a measuring pump and mixed and used.
- a mechanical mixing device for example, a general-purpose mixer such as a static mixer
- a dispenser that can be mixed by loading a package of each component and squeezing each component at a constant volume volume or volume ratio is exemplified.
- the mixture When each component of the multi-component heat conductive silicone gel composition is mixed and used with an open mixer, the mixture may be defoamed before use, and it is preferable.
- the liquid (I) and the liquid (II) constituting the multi-component heat conductive silicone gel composition of the present invention are excellent in long-term storage stability, do not cause separation problems, and are uniformly mixed by a simple method. Since it is possible, the handling workability is remarkably excellent.
- the alkenyl group-containing organopolysiloxane as the component (A) has (A-1) an alkenyl group-containing organopolysiloxane having a siloxane degree of polymerization in the range of 5 to 100, and (A-2) a siloxane degree of polymerization of 400 or more. It consists of an organopolysiloxane containing an alkenyl group.
- the degree of siloxane polymerization is the number of siloxane units calculated from the number average molecular weight of the organopolysiloxane obtained by NMR.
- the alkenyl group-containing organopolysiloxane which is the component (A-1), is the main component of the thermally conductive silicone gel composition, has a siloxane degree of polymerization in the range of 5 to 100, and preferably has a viscosity at 25 ° C. of 10. It is within the range of ⁇ 100 mPa ⁇ s.
- the viscosity of the component (A-1) at 25 ° C. is preferably in the range of 10 to 100 mPa ⁇ s.
- the degree of polymerization of the component (A-1) is less than the above lower limit or the viscosity of the component (A-1) is less than 10 mPa ⁇ s, the physical properties of the obtained silicone gel tend to deteriorate.
- the degree of polymerization of the component (A-1) exceeds the above upper limit, and particularly when the viscosity of the component (A-1) exceeds 100 mPa ⁇ s, the extrudability of the obtained silicone gel composition and the static mixer or the like are used. Mixability tends to decrease.
- the alkenyl group-containing organopolysiloxane as the component (A-2) is a separation inhibitor for the component (A-1) which is the main component of the thermally conductive silicone gel composition, and has a siloxane degree of polymerization of 400 or more, which is suitable.
- the viscosity of component (A-2) at 25 ° C. may be in the range of 10,000 to 10,000,000 mPa ⁇ s
- component (A-2) is a plastic, gum-like alkenyl group-containing organono. It may be polysiloxane.
- a raw rubber-like alkenyl group-containing organo having a viscosity of 10,000 mPa ⁇ s or more at 25 ° C. or having a plasticity in the range of 50 to 200 measured according to the method specified in JIS K6249. It may be polysiloxane. Further, preferably, the viscosity at 25 ° C. is in the range of 10 to 100,000 times that of (A-1). If the viscosity of the component (A-2) at 25 ° C. is less than 10 times, the separation of the component (A-1) may not be effectively prevented. From the viewpoint of the overall viscosity, the viscosity of the component (A-2) at 25 ° C.
- the content of the component (A-2) is such that the mixed viscosity of the component (A-1) and the component (A-2) is 1.15 to 5.5 times the viscosity of the component (A-1).
- the mixed viscosity may be in the range of 1.2 to 5.25 times the viscosity of the component (A-1), more preferably 1.2 to 3.0 times, and 1.2 to 2.0 times. A doubling amount is particularly suitable.
- the mixed viscosity of the component (A-1) and the component (A-2) is the measured value, the oil blend chart provided by the silicone manufacturer, and the viscosities of the low-viscosity oil and the high-viscosity oil at both ends.
- the viscosities [A-1] and [A-2] can be calculated from the values read from the blending ratio at that time by plotting and connecting the lines. If the viscosity [A-1] [A-2] / viscosity [A-1] is 1.15 or less, the effect of the component (A-2) cannot be obtained, and if it exceeds 5.5, it is expected.
- the degree [A-1] [A-2] / viscosity [ A-1] is particularly preferably 1.20 to 2.0.
- the component (A-1) and the component (A-2) having an overall viscosity of 200 mPa ⁇ s or less, more preferably 150 mPa ⁇ s or less after mixing of the component (A-1) and the component (A-2). ) Can be preferably used.
- the component (A) is composed of one or more alkenyl group-containing organopolysiloxanes.
- the molecular structure of such an alkenyl group-containing organopolysiloxane is not particularly limited, and examples thereof include linear, branched, cyclic, cyclic, and three-dimensional network structures, and combinations thereof.
- the component (A) may consist only of a linear alkenyl group-containing organopolysiloxane, may consist only of an alkenyl group-containing organopolysiloxane having a branched structure, or may consist of a linear organo.
- It may consist of a mixture of polysiloxane and an alkenyl group-containing organopolysiloxane having a branched structure.
- alkenyl group in the molecule a vinyl group, an allyl group, a butenyl group, a hexenyl group and the like are exemplified.
- an organic group other than the alkenyl group in the component (A) an alkyl group such as a methyl group, an ethyl group or a propyl group; an aryl group such as a phenyl group or a tolyl group; a 3,3,3-trifluoropropyl group or the like.
- a monovalent hydrocarbon group excluding an alkenyl group such as an alkyl halide group is exemplified.
- the component (A) is a linear alkenyl group-containing organopolysiloxane, preferably containing an alkenyl group at least at both ends of the molecular chain, and containing an alkenyl group only at both ends of the molecular chain. May be.
- the component (A) is not particularly limited, and is, for example, a dimethylpolysiloxane having both ends of the molecular chain and dimethylvinylsiloxy group-blocked, a dimethylsiloxane / methylvinylsiloxane copolymer having both ends of the molecular chain, and both molecular chains.
- Examples include coalescence and mixtures of two or more of these polymers.
- low molecular weight siloxane oligomers octamethyltetrasiloxane (D4), decamethylpentasiloxane (D5)
- D4 octamethyltetrasiloxane
- D5 decamethylpentasiloxane
- the component (A) of the present invention further comprises a general formula bonded to a silicon atom:
- R 1 is the same or different monovalent hydrocarbon group without an aliphatic unsaturated bond
- R 2 is an alkyl group
- R 3 is the same or different alkylene group
- p is an integer of 1 to 50.
- It may have an alkoxysilyl-containing group represented by.
- the organopolysiloxane having these functional groups suppresses the thickening of the composition in the uncured state and has an alkoxysilyl group in the molecule, so that it also functions as a surface treatment agent for the component (D). Therefore, thickening and oil bleeding of the obtained composition are suppressed, and there is a case where the benefit that the handling workability is not impaired can be obtained.
- the component (B) is a component of the above-mentioned liquid (II), is a main cross-linking agent of the heat conductive silicone gel composition of the present invention, and is an organodone having two or more silicon atom-bonded hydrogen atoms in the molecule.
- Hydrogen polysiloxane can be used without particular limitation, but the number of silicon atom-bonded hydrogen atoms in the molecule of organohydrogenpolysiloxane (average) from the viewpoint of flexibility and vertical retention of the obtained heat conductive silicone gel cured product.
- the value) is preferably in the range not exceeding 8.
- the amount of the silicon atom-bonded hydrogen atom in the component (B) is 0.2 to 5 mol with respect to at least 1 mol of the alkenyl group contained in the component (B).
- the resulting thermally conductive silicone gel cured product must be in the range of 0.3 to 2.0 mol, or 0.4 to 1.0 mol. It is particularly preferable from the viewpoint of the formation of the cured product and the peelability and repair property of the cured product.
- the content of the silicon atom-bonded hydrogen atom in the component (B) is less than the lower limit, it may cause curing failure of the heat conductive silicone gel composition, and if it exceeds the upper limit, silicon The amount of atomic-bonded hydrogen atoms may become excessive, and the peelability and repairability of the cured product may be impaired.
- the component (B1) has a viscosity of (B1) of 1 to 1,000 mPa ⁇ s at 25 ° C. It is preferable to contain at least a linear organohydrogenpolysiloxane having an average of 2 to 4 silicon atom-bonded hydrogen atoms in the molecule, of which at least 2 are in the side chain of the molecular chain. ..
- the structure of the above component (B1) means that the component (B1) functions as a cross-linking extender in the present composition by the hydrosilylation reaction of the silicon atom-bonded hydrogen atom on the side chain of the molecular chain.
- the component (B1) functions as a cross-linking extender for the component (A) in the thermally conductive silicone gel composition of the present invention, and the entire composition is gently cross-linked to form a gel-like cured product.
- the component (B) has at least two silicon atom-bonded hydrogen atoms on the side chain of the molecular chain on average, and has only 2 to 4 silicon atom-bonded hydrogen atoms in the molecule on average. Since it is contained, the cross-linking extension reaction mainly by 2 to 4 silicon atom-bonded hydrogen atoms on the side chain proceeds, and the heat conduction is excellent in peelability from the member and excellent in repairability such as repair and reuse. A cured product of sex silicone gel is formed.
- the component (B) contains an average of 2 to 3 silicon atom-bonded hydrogen atoms in the molecule (B1-1), of which at least 2 are molecular chains. It is preferably a linear organohydrogen polysiloxane having a side chain, and (B1-1-1) an organohydrogen having an average of 2 to 3 silicon atom-bonded hydrogen atoms only in the side chain of the molecular chain. It is particularly preferably polysiloxane. It is most preferable that the number of silicon atom-bonded hydrogen atoms in the component (B1) is only two on average only in the side chain of the molecular chain.
- Examples of such a component (B1) include a trimethylsiloxy group-blocked methylhydrogensiloxane / dimethylsiloxane copolymer at both ends of the molecular chain and a dimethylhydrogensiloxy group-blocked methylhydrogensiloxane / dimethylsiloxane copolymer at both ends of the molecular chain. Will be done. In addition, these examples are not limited, and a part of the methyl group may be substituted with a phenyl group, a hydroxyl group, an alkoxy group and the like.
- the viscosity of the component (B1) at 25 ° C. is not particularly limited, but is preferably in the range of 1 to 500 mPa ⁇ s, and further, from the viewpoint of preventing contact failure and the like, a low molecular weight siloxane oligomer (octamethyltetrasiloxane (octamethyltetrasiloxane). It is preferable that D4) and decamethylpentasiloxane (D5)) are reduced or removed.
- the component (B) of the present invention is an organohydrogenpolysiloxane other than the component (B1), for example, a trimethylsiloxy group-blocking methyl at both ends of the molecular chain containing an average number of silicon atom-bonded hydrogen atoms in the molecule of more than four.
- Hydrogensiloxane / dimethylsiloxane copolymer, silicon atom-bonded in the molecule Contains more than 4 hydrogen atoms on average.
- Both ends of the molecular chain Dimethylhydrogensiloxy group-blocked methylhydrogensiloxane / dimethylsiloxane copolymer, molecule A trimethylsiloxy group-blocking methylhydrogenpolysiloxane at both ends of the chain, a dimethylhydrogensiloxy group-blocking dimethylpolysiloxane at both ends of the molecular chain, a methylhydrogensiloxy group-containing siloxane resin, and the like may be contained as a cross-linking agent.
- the ratio of the component (B1) is preferably a certain amount or more.
- the value of [H non-B1 ] / ([H B1 ] + [H non-B1 ]) is preferably in the range of 0.0 to 0.70, and the same value is 0. It may be 0.0 to 0.50, 0.0 to 0.25, 0.0.
- the following combinations are suitable for the organohydrogenpolysiloxane which is the cross-linking agent in the present composition.
- (B'2) In addition to the component (B1), Dimethylhydrogensiloxy group-blocking dimethylpolysiloxane at both ends of the molecular chain, An average of 5 to 8 silicon atom-bonded hydrogen atoms in the molecule is contained in the trimethylsiloxy group-blocking methylhydrogensiloxane / dimethylsiloxane copolymer at both ends of the molecular chain, and an average of 5 silicon atom-bonded hydrogen atoms in the molecule.
- Organohydrogenpolysiloxane mixture containing one or more selected from dimethylhydrogensiloxy group-blocking methylhydrogensiloxane / dimethylsiloxane copolymers containing up to 8 molecular chains
- the value of [H non-B1 ] / ([H B1 ] + [H non-B1 ]) may be in the same range as above. preferable.
- the organohydrogenpolysiloxane in the composition is a mixture shown in (B'2) above, particularly a mixture of the component (B1) and dimethylhydrogensiloxy group-blocking dimethylpolysiloxane at both ends of the molecular chain.
- the amount of silicon atom-bonded hydrogen atoms in the organohydrogenpolysiloxane is preferably 0.5 to 1.5 mol, preferably 0.7 to 1. More preferably, the amount is in the range of 0 mol.
- the amount of silicon atom-bonded hydrogen atoms in the organohydrogenpolysiloxane is 0.3 to 1.5 mol. It is preferable that the amount is in the range of 0.4 to 1.0 mol, and more preferably.
- the heat conductive silicone gel composition which is the technical effect of the present invention, has the best fluidity and gap fill property, and is the most excellent.
- the resulting thermally conductive silicone gel cured product has the best physical properties, especially peelability and repairability.
- the catalyst for the hydrosilylation reaction is a component of the above solution (I), and examples thereof include a platinum-based catalyst, a rhodium-based catalyst, and a palladium-based catalyst, and a platinum-based catalyst is preferable because it can remarkably accelerate the curing of the present composition.
- the platinum-based catalyst include platinum fine powder, platinum chloride acid, an alcohol solution of platinum chloride acid, a platinum-alkenylsiloxane complex, a platinum-olefin complex, a platinum-carbonyl complex, and these platinum-based catalysts are made of silicone resin and polycarbonate.
- catalysts are dispersed or encapsulated in a thermoplastic resin such as a resin or an acrylic resin, and a platinum-alkenylsiloxane complex is particularly preferable.
- a thermoplastic resin such as a resin or an acrylic resin
- a platinum-alkenylsiloxane complex is particularly preferable.
- this alkenylsiloxane include 1,3-divinyl-1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane.
- Examples thereof include alkenylsiloxanes in which some of the methyl groups of these alkenylsiloxanes are substituted with ethyl groups, phenyl groups and the like, and alkenylsiloxanes in which the vinyl groups of these alkenylsiloxanes are substituted with allyl groups, hexenyl groups and the like.
- the platinum-alkenylsiloxane complex since the platinum-alkenylsiloxane complex has good stability, it is preferably 1,3-divinyl-1,1,3,3-tetramethyldisiloxane.
- a fine particle platinum-containing hydrosilylation reaction catalyst dispersed or encapsulated with a thermoplastic resin may be used.
- a non-platinum metal catalyst such as iron, ruthenium, or iron / cobalt may be used.
- the amount of the catalyst for the hydrosilylation reaction added is the amount of the catalyst, which is the amount of the metal atom in the range of 0.01 to 500 ppm in mass unit and the range of 0.01 to 100 ppm with respect to the component (A).
- the amount is preferably in the range of 0.01 to 50 ppm.
- the composition of the present invention preferably further contains a hydrosilylation reaction inhibitor.
- the hydrosilylation reaction inhibitor is a component for suppressing the hydrosilylation reaction of the thermally conductive silicone gel composition of the present invention, and specifically, for example, an acetylene-based or amine-based ester such as ethynylcyclohexanol. Examples thereof include reaction inhibitors such as carboxylic acid ester type and phosphite ester type.
- the amount of the reaction inhibitor added is usually 0.001 to 5% by mass based on the total amount of the silicone gel composition.
- 3-methyl-1-butyne-3-ol, 3,5-dimethyl-1-hexin-3-ol, 3-phenyl-1-butyne- Acetylene compounds such as 3-ol; enein compounds such as 3-methyl-3-pentene-1-in and 3,5-dimethyl-3-hexene-1-in; 1,3,5,7-tetramethyl- Cycloalkenylsiloxanes such as 1,3,5,7-tetravinylcyclotetrasiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetrahexenylcyclotetrasiloxane; triazole compounds such as benzotriazole Etc. can be used without particular limitation.
- the component (D) is a component common to the above liquids (I) and (II), and is for imparting thermal conductivity to the present composition and the thermally conductive member obtained by curing the present composition. It is a thermally conductive filler.
- a component (D) was selected from the group consisting of pure metals, alloys, metal oxides, metal hydroxides, metal nitrides, metal carbides, metal silicates, carbons, soft magnetic alloys and ferrites. At least one kind of powder and / or fiber is preferable, and a metal powder, a metal oxide powder, a metal nitride powder, or a carbon powder is preferable.
- thermally conductive filler is surface-treated with alkoxysilane, which is a component (E) described later.
- these powders and / or fibers treated with various surface treatment agents known as coupling agents may be used.
- a surfactant, other silane coupling agents, an aluminum-based coupling agent, and a silicone-based surface treatment include agents.
- Examples of pure metals include bismuth, lead, tin, antimony, indium, cadmium, zinc, silver, copper, nickel, aluminum, iron and metallic silicon. Alloys include alloys consisting of two or more metals selected from the group consisting of bismuth, lead, tin, antimony, indium, cadmium, zinc, silver, aluminum, iron and metallic silicon.
- Examples of the metal oxide include alumina, zinc oxide, silicon oxide, magnesium oxide, beryllium oxide, chromium oxide and titanium oxide.
- Examples of the metal hydroxide include magnesium hydroxide, aluminum hydroxide, barium hydroxide, and calcium hydroxide.
- metal nitride examples include boron nitride, aluminum nitride and silicon nitride.
- metal carbides include silicon carbide, boron carbide and titanium carbide.
- Metal silides include magnesium silicate, titanium silicate, zirconium silicate, tantalum silicate, niobium silicate, chromium silicate, tungsten silicate and molybdenum silicate.
- carbon examples of carbon include diamond, graphite, fullerene, carbon nanotube, graphene, activated carbon and amorphous carbon black.
- Fe-Si alloy, Fe-Al alloy, Fe-Si-Al alloy, Fe-Si-Cr alloy, Fe-Ni alloy, Fe-Ni-Co alloy, Fe-Ni-Mo alloy, Fe. -Co alloys, Fe—Si—Al—Cr alloys, Fe—Si—B alloys and Fe—Si—Co—B alloys can be mentioned.
- the ferrite include Mn-Zn ferrite, Mn-Mg-Zn ferrite, Mg-Cu-Zn ferrite, Ni-Zn ferrite, Ni-Cu-Zn ferrite and Cu-Zn ferrite.
- the component (D) is preferably silver powder, aluminum powder, aluminum oxide powder, zinc oxide powder, aluminum nitride powder or graphite.
- it is preferably a metal oxide-based powder or a metal nitride-based powder, and in particular, an aluminum oxide powder, a zinc oxide powder, or an aluminum nitride powder is preferable.
- the shape of the component (D) is not particularly limited, and examples thereof include a spherical shape, a needle shape, a disk shape, a rod shape, and an indefinite shape, and a spherical shape and an indefinite shape are preferable.
- the average particle size of the component (D) is not particularly limited, but is preferably in the range of 0.01 to 500 ⁇ m, and more preferably in the range of 0.01 to 300 ⁇ m.
- the component (D) is (D1) a plate-shaped boron nitride powder having an average particle size of 0.1 to 150 ⁇ m, and (D2) a granular or spherically formed boron nitride having an average particle size of 0.1 to 500 ⁇ m.
- the suitable component (D) it is a mixture of two or more kinds of spherical and crushed aluminum oxide powder having an average particle size of 0.01 to 50 ⁇ m.
- the filling efficiency is improved, and low viscosity and high thermal conductivity can be achieved.
- the content of the component (D) is in the range of 600 to 3,500 parts by mass with respect to 100 parts by mass of the component (A-1) in the entire composition for each of the liquid (I) and the liquid (II). It is preferably in the range of 1200 to 3,000 parts by mass. That is, as a whole composition, the total of the components (D) in the liquid (I) and the liquid (II) may be in the range of 1200 to 7000 parts by mass, and the total may be in the range of 2400 to 6000 parts by mass. It may be in the range of 2400 to 5500 parts by mass.
- the composition of the present invention has a thermal conductivity of 2.0 W / mK or more, and the content of the component (D) is preferably in the range of 80 to 98% by mass, and 82 to 95% by mass of the entire composition. Is more preferable, and the range of 85 to 95% by mass is particularly preferable.
- the composition of the present invention has, as an optional component, an inorganic filler such as fumed silica, wet silica, pulverized quartz, titanium oxide, magnesium carbonate, zinc oxide, iron oxide, diatomaceous earth, and carbon black (“inorganic filling”). It is not completely prevented from blending an inorganic filler obtained by hydrophobically treating the surface of such an inorganic filler with an organic silicon compound (silazane, etc.), but the technical effect of the present invention is In particular, from the viewpoint of achieving both high thermal conductivity and gap fill property, it is preferable that the filler other than the component (D) is substantially not contained.
- an inorganic filler such as fumed silica, wet silica, pulverized quartz, titanium oxide, magnesium carbonate, zinc oxide, iron oxide, diatomaceous earth, and carbon black
- the content of the filler other than the component (D) in the composition is preferably less than 1% by mass, and more preferably less than 0.5% by mass. Most preferably, the intentional addition amount of the filler other than the component (D) is 0.0% by mass in the composition.
- the present composition contains two types of surface treatment agents having different chemical structures: component (E) and component (F) in specific amounts. Specifically, when the total component (D) of the present invention is 100% by mass, these components are blended in the range of 0.1 to 5.0% by mass, and the component (D) is these components. It is preferable that the surface is treated with.
- the surface treatment step of the component (D) is optional, but from the viewpoint of improving the fluidity, gap fill property and thixotropy property of the present composition, at least a part of the component (D) is surfaced by the component (E).
- a step in which the component (D) is surface-treated by the component (F) is preferably exemplified.
- the component (E) is a surface treatment agent for the component (D), which is a component common to the above solutions (I) and (II), improves the blending amount of the component (D), and is a composition. It is a component that improves the overall viscosity and fluidity.
- a known silane coupling agent or a hydrolyzed condensate thereof can be used without particular limitation, and in particular, a component (E1) described later: an alkyl having 6 or more carbon atoms in the molecule. It is preferable to include an alkoxysilane having a group.
- the silane coupling agent which is the component (E) has a general formula: R 1 (4-c) Si (OR 2 ) c It is represented by.
- R 1 is a monovalent hydrocarbon group, an epoxy group-containing organic group, a methacryl group-containing organic group, or an acrylic group-containing organic group.
- Examples of the monovalent hydrocarbon group of R 1 include linear alkyl groups such as methyl group, ethyl group, propyl group, butyl group, hexyl group and decyl group; branched chains such as isopropyl group, tertiary butyl group and isobutyl group.
- Cyclic alkyl group cyclic alkyl group such as cyclohexyl group; alkenyl group such as vinyl group, allyl group, butenyl group, pentenyl group, hexenyl group, heptenyl group; aryl group such as phenyl group, tolyl group, xsilyl group; benzyl group, Aralkyl groups such as phenethyl groups; substituted or unsubstituted monovalent hydrocarbon groups such as alkyl halides such as 3,3,3-trifluoropropyl group and 3-chloropropyl group are exemplified.
- the epoxy group-containing organic group of R4 includes a glycidoxyalkyl group such as 3-glycidoxypropyl group and 4-glycidoxybutyl group; 2- (3,4-epoxycyclohexyl) ethyl group and 3-.
- An epoxycyclohexylalkyl group such as a (3,4-epoxycyclohexyl) propyl group is exemplified.
- Examples of the methacryl group-containing organic group of R 1 include methacryloxyalkyl groups such as 3-methacryloxypropyl group and 4-methacryloxybutyl group.
- Examples of the acrylic group-containing organic group of R 1 include acryloxyalkyl groups such as 3-acryloxypropyl group and 4-acryloxysibutyl group.
- R 2 is an alkyl group, an alkoxyalkyl group, an alkenyl group, or an acyl group, and is exemplified.
- the alkyl group of R 2 include a linear alkyl group, a branched chain alkyl group, and a cyclic alkyl group similar to the above, and examples of the alkoxyalkyl group of R 2 include a methoxyethyl group and a methoxypropyl group.
- alkenyl group R 2 a vinyl group, an allyl group, butenyl group, pentenyl group, hexenyl group and the like
- the acyl group of R2 an acetyl group, octanoyl group are exemplified.
- c is an integer of 1 to 3, preferably 3.
- Examples of such a component (E) other than the component (E1) include methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, n-propyltrimethoxysilane, butyltrimethoxysilane, and pentiltli.
- the component (E1) is a suitable component in the present composition together with the component (B1), and is an alkoxysilane having an alkyl group having 6 or more carbon atoms in the molecule.
- specific examples of the alkyl group having 6 or more carbon atoms include an alkyl group such as a hexyl group, an octyl group, a dodecyl group, a tetradecyl group, a hexadecyl group and an octadecyl group, and an aralkyl group such as a benzyl group and a phenylethyl group.
- an alkyl group having 6 to 20 carbon atoms is particularly preferable.
- an alkoxysilane having an alkyl group having less than 6 carbon atoms the effect of lowering the viscosity of the composition is insufficient, and the viscosity of the composition increases, so that the desired fluidity and gap fill property cannot be achieved. There is. Further, when an alkoxysilane having an alkyl group having 20 or more carbon atoms is used, the industrial supply property is inferior, and the compatibility may be lowered depending on the type of the component (A).
- the component (E1) has the following structural formula: Y n Si (OR) 4-n (In the formula, Y is an alkyl group having 6 to 18 carbon atoms, R is an alkyl group having 1 to 5 carbon atoms, and n is a number of 1 or 2).
- the alkoxysilane is represented by, and examples of the OR group include a methoxy group, an ethoxy group, a propoxy group, and a butoxy group, and a methoxy group and an ethoxy group are particularly preferable.
- n is 1, 2, or 3, and is particularly preferably 1.
- such a component (E1) is C 6 H 13 Si (OCH 3 ) 3 , C 8 H 17 Si (OC 2 H 5 ) 3 , C 10 H 21 Si (OCH 3 ) 3 , C.
- Examples include 11 H 23 Si (OCH 3 ) 3 , C 12 H 25 Si (OCH 3 ) 3 , C 14 H 29 Si (OC 2 H 5 ) 3, and the like, most preferably decyltrimethoxysilane.
- the component (E) of the present invention preferably contains the above component (E1).
- the component (E1) may be used alone, or it may be a mixture of the component (E1) and another silane coupling agent. Further, if desired, only a silane coupling agent other than the component (E1) may be used, or a part or all of these silane coupling agents may be used in a pre-hydrolyzed form.
- the component (F) is a component common to the above solutions (I) and (II), and unlike the component (E), it has a hydrolyzable silyl group at the end of one molecular chain and is a polysiloxane.
- the component (F) is an organopolysiloxane having a hydrolyzable silyl group at the end of the molecular chain, and its structure is not particularly limited, but such a component (F) is described below. It is an organopolysiloxane represented by the general formula (1) or the general formula (2), or a mixture thereof.
- R 4 is a monovalent or heterologous hydrocarbon group of the same type
- R 5 is an oxygen atom or a divalent hydrocarbon group
- R 3 is a group similar to the above
- p is 100 to 500. It is an integer
- d is an integer similar to the above.
- the component (F) represented by the general formula (1) has a hydrolyzable silyl group at one end of the molecular chain.
- the flow of the present composition does not deteriorate even when a large amount of the component (D) is blended, without deteriorating the handleability and moldability. It is possible to provide a thermally conductive silicone gel composition having improved properties, gap fill properties and thixotropy properties and excellent vertical holding property, and good adhesion to a substrate in contact during curing. Can be given.
- R 1 is an independently unsubstituted or substituted monovalent hydrocarbon group, and examples thereof include a linear alkyl group, a branched chain alkyl group, a cyclic alkyl group, and an alkenyl group. Examples include an aryl group, an aralkyl group, and an alkyl halide group. Examples of the linear alkyl group include a methyl group, an ethyl group, a propyl group, a hexyl group and an octyl group.
- Examples of the branched chain alkyl group include an isopropyl group, an isobutyl group, a tert-butyl group and a 2-ethylhexyl group.
- Examples of the cyclic alkyl group include a cyclopentyl group and a cyclohexyl group.
- Examples of the alkenyl group include a vinyl group and an allyl group.
- Examples of the aryl group include a phenyl group and a tolyl group.
- Examples of the aralkyl group include a 2-phenylethyl group and a 2-methyl-2-phenylethyl group.
- alkyl halide group examples include a 3,3,3-trifluoropropyl group, a 2- (nonafluorobutyl) ethyl group, and a 2- (heptadecafluorooctyl) ethyl group.
- R 1 is preferably a methyl group or a phenyl group.
- R 2 is independently a hydrogen atom, an alkyl group, an alkoxyalkyl group, an alkenyl group, or an acyl group.
- alkyl group include a linear alkyl group, a branched chain alkyl group, and a cyclic alkyl group similar to those exemplified for R 1 .
- alkoxyalkyl group include a methoxyethyl group and a methoxypropyl group.
- the acyl group include an acetyl group and an octanoyl group.
- R 2 is preferably an alkyl group, and particularly preferably a methyl group, an ethyl group.
- a is an integer in the range of 5 to 250, preferably in the range of 10 to 200. Further, b is an integer of 1 to 3, preferably 2 or 3.
- the component (F) represented by the general formula (2) has a hydrolyzable silyl group bonded to one end of the molecular chain via a divalent hydrocarbon group such as an alkylene group or an oxygen atom.
- a divalent hydrocarbon group such as an alkylene group or an oxygen atom.
- R 4 in the formula is a monovalent hydrocarbon group of the same type or a different type, and is the same linear alkyl group, branched chain alkyl group, cyclic alkyl group, aryl group, aralkyl group, alkenyl group, alkyl halide group as described above. Is exemplified, preferably a linear alkyl group, and particularly preferably a methyl group.
- R 5 in the above formula is an oxygen atom or a divalent hydrocarbon radical.
- Examples of the divalent hydrocarbon group of R 5 include an alkylene group such as a methylene group, an ethylene group, a propylene group, an isopropylene group and a butylene group; and an alkyleneoxyalkylene group such as an ethyleneoxyethylene group and an ethyleneoxypropylene group. Be done.
- R 5 is preferably an oxygen atom.
- R 3 in the above equation is a group similar to the above.
- p in the above equation is an integer of 100 to 500, preferably an integer of 105 to 500, more preferably an integer of 110 to 500, and particularly preferably an integer of 110 to 200.
- p in the above formula is less than the lower limit of the above range, it tends to be impossible to contain a large amount of the component (D) in order to obtain the thermally conductive silicone gel composition of the present invention.
- the upper limit of the above range is exceeded, the molecular volume constrained by the surface of the component (D) increases too much, and similarly, a large amount of the component (D) cannot be contained in the composition. Because there is.
- d in the above equation is an integer of 1 to 3, preferably 3.
- the total amount of the component (E) and the component (F) used is 0.1 to 5.0% by mass with respect to the above component (D), and is 0.1 to 4.0% by mass.
- the amount may be 0.2 to 3.5% by mass. If the amount of these components used is less than the above lower limit, the effect of lowering the viscosity of the composition may be insufficient. Further, when the amounts of the component (E) and the component (F) used exceed the above upper limit, the effect of reducing the viscosity may be saturated, the alkoxysilane may be further separated, and the storage stability of the composition may be lowered.
- the above-mentioned component (E) and the above-mentioned component (F) are preferably blended in a form in which the above-mentioned component (D) is surface-treated by these components.
- the surface treatment of the component (D) by the component (E) and the component (F) may be performed at the same time, and after surface-treating at least a part of the component (D) with one of the components, the other The component may be further subjected to surface treatment of the component (D).
- the surface treatment method using the component (E) and the component (F) is common to the liquid (I) and the liquid (II), and is not particularly limited, but to the heat conductive inorganic filler which is the component (D).
- Direct treatment method, integral blend method, dry concentrate method and the like can be used.
- the direct treatment method includes a dry method, a slurry method, a spray method, etc.
- the integral blend method includes a direct method, a masterbatch method, etc. Of these, the dry method, the slurry method, the direct method, etc. are often used. ..
- the total amount of the component (D) and the component (E) may be divided into multiple stages and mixed in advance using a known mixing device to treat the surface thereof.
- a part of the component (E) may be hydrolyzed or form a polymer on the surface of the component (D), and the surface treatment in the present invention may be formed. It is included in the concept of.
- the surface treatment method using the component (E) and the component (F) in the present invention is preferably a direct treatment method, and in particular, the component (D), the component (E), and the component (F) are mixed and heated (
- the heat surface treatment method of performing base heat) can be most preferably exemplified. Specifically, after uniformly mixing a part of the component (D) or the component (D) with the component (E), and optionally a part of the main component (A) or the component (B), the component (F) ) And the residue of the component (D) can be mixed, preferably under reduced pressure, and the mixture can be heated and stirred at 100 to 200 ° C. At this time, the temperature condition and the stirring time can be designed according to the amount of the sample, but are preferably in the range of 120 to 180 ° C. and 0.25 to 10 hours.
- the heat conductive filler as the component (D) is used as the component (E) for surface treatment with two or more kinds of treatment agents having different molecular weights.
- the component (D) may be surface-treated by adding a treatment agent having a large molecular weight first and then adding a treatment agent having a small molecular weight later.
- the above component (E1) good fluidity and gap fillability can be realized only by one-step surface treatment without performing the above-mentioned multi-step surface treatment. In particular, there are practical benefits in the process. Further, even if it is placed at this time, it is preferable to add the component (F) after the addition of the component (E1).
- the mixing device is not particularly limited, and examples thereof include a uniaxial or biaxial continuous mixer, a double roll, a loss mixer, a hobert mixer, a dental mixer, a planetary mixer, a kneader mixer, and a Henschel mixer.
- composition of the present invention comprises the above-mentioned components (A) to (F), optionally other cross-linking agents and a hydrosilylation reaction inhibitor, in the liquids (I) and (II), but is mixed. From the viewpoint of improving the heat resistance of the heat conductive silicone gel composition and the cured product thereof, it is preferable to further contain (G) a heat resistance imparting agent.
- the component (G) may be blended in either solution (I) or solution (II), and when the composition is designed to have three or more components, it is added as an independent component. You may.
- the component (G) is not particularly limited as long as it can impart heat resistance to the composition of the present invention and its cured product, but for example, metal oxides such as iron oxide, titanium oxide, cerium oxide, magnesium oxide and zinc oxide. , Metal hydroxides such as cerium hydroxide, phthalocyanine compounds, cerium silanolate, cerium fatty acid salts, reaction products of organopolysiloxane and cerium carboxylates, and the like.
- phthalocyanine compound is a phthalocyanine compound, and for example, an additive selected from the group consisting of a metal-free phthalocyanine compound and a metal-containing phthalocyanine compound disclosed in JP-A-2014-503680 is preferably used, and a metal-containing phthalocyanine is preferably used.
- copper phthalocyanine compounds are particularly suitable.
- An example of the most suitable and non-limiting heat resistance imparting agent is 29H, 31H-phthalocyaninato (2-) -N29, N30, N31, N32 copper.
- Such phthalocyanine compounds are commercially available, for example, Stan-tone TM 40SP03 from PolyOne Corporation (Avon Lake, Ohio, USA).
- the blending amount of such a component (G) may be in the range of 0.01 to 5.0% by mass of the entire composition, 0.05 to 0.2% by mass, and 0.07 to 0. It may be in the range of 1% by mass.
- the thermally conductive silicone gel composition of the present invention may contain any component as long as the object of the present invention is not impaired.
- the optional component include an organopolysiloxane containing no silicon atom-bonded hydrogen atom and a silicon atom-bonded alkenyl group, a cold resistance imparting agent, a flame retardant imparting agent, a pigment, a dye and the like.
- the thermally conductive silicone gel composition of the present invention is, if desired, one or more kinds of known adhesive-imparting agents, cationic surfactants, anionic surfactants, nonionic surfactants and the like.
- Antistatic agents dielectric fillers; electrically conductive fillers; mold-releasing components; thixophilic imparting agents; antifungal agents and the like can be included. Further, if desired, an organic solvent may be added. These additives may be blended in either solution (I) or solution (II), and when the composition is designed to have three or more components, they may be added as independent components. Good.
- the thermally conductive silicone gel composition of the present invention can be prepared by mixing each of the above components. For example, in the case of the solution (I), the component (A-1), the component (A-2), and the component ( D), component (E), and component (F) are mixed, the surface of component (D) is treated with component (E) and component (F), and then component (C) and, if necessary, component (G). , And any other component can be mixed.
- the component (A-1), the component (A-2), the component (D), the component (E), and the component (F) are mixed in advance, and the surface of the component (D) is coated with the component (D). It can be prepared by treating with E), component (F), and then mixing component (B), optionally component (G), and any other component. Further, the component (A-1) and the component (A-2) are not used, the component (D), the component (E), and the component (F) are mixed, and the surface of the component (D) is treated with the component (E). It can also be prepared by treating with component (F) and then mixing component (B), optionally component (G), and any other component.
- the component (A-1) and the component (A-2) are mixed in advance and then blended, that is, the component (in the form of a so-called masterbatch).
- A-1) and the component (A-2) may be blended and used as a component of the liquid (II), which is suitable.
- the mixing method of each component is not particularly limited by a conventionally known method, but it is usually preferable to mix using a mixing device because a uniform mixture can be obtained by simple stirring.
- a mixing device is not particularly limited, and examples thereof include a uniaxial or biaxial continuous mixer, a double roll, a loss mixer, a hobert mixer, a dental mixer, a planetary mixer, a kneader mixer, and a Henschel mixer.
- the thermally conductive silicone gel composition of the present invention is a multi-component type (including a multi-component type, particularly a two-component type) in which the separated multi-components are mixed at the time of use, and a plurality of individually stored multi-components.
- the composition can be mixed and used in a predetermined ratio.
- These packages can be selected as desired according to the curing method, coating means, and application target described later, and are not particularly limited.
- the thermally conductive silicone gel composition of the present invention is cured by a hydrosilylation reaction to form a cured silicone gel having excellent thermal conductivity.
- the temperature conditions for curing the hydrosilylation reaction-curable silicone gel composition are not particularly limited, but are usually in the range of 20 ° C. to 150 ° C., more preferably in the range of 20 ° C. to 80 ° C. If desired, it may be cured at a high temperature for a short time, or at a low temperature such as room temperature for a long time (for example, several hours to several days), and is not particularly limited.
- the cured silicone gel product of the present invention preferably satisfies the range of 2 to 70 with a type E hardness tester defined by JIS K6249, and more preferably satisfies the range of 2 to 50.
- a cured silicone gel having a hardness in such a range has the characteristics of a silicone gel such as low elastic modulus and low stress.
- the hardness is greater than 70, the adhesion to the heat generating member is excellent, but the followability may be deteriorated.
- the hardness is less than 2
- the followability is excellent, but the fixing property of the heat generating member is poor. It may get worse.
- the thermally conductive silicone gel composition of the present invention can stably and highly fill the thermally conductive filler, and is 2.0 W / mK or more, preferably 3.5 W / mK or more, more preferably 4 It has a thermal conductivity of 0.0 W / mK or higher, particularly preferably 5.0 W / mK.
- the thermally conductive silicone gel composition of the present invention it is possible to design a composition of 4.0 to 7.0 W / mK and a cured silicone gel, and it is possible to realize the above-mentioned gap fill property. ..
- the heat conductive silicone gel composition of the present invention is a heat transfer material (heat transfer material) that is interposed at the interface between the thermal interface of the heat generating component and the heat radiating member such as a heat sink or a circuit board for cooling the heat generating component by heat conduction. It is useful as a heat conductive member), and a heat radiating structure equipped with this can be formed.
- the type, size, and detailed structure of the heat-generating component are not particularly limited, but the thermally conductive silicone gel composition of the present invention has high thermal conductivity and a gap fill to the member.
- the structure of such a heat radiating structure is not particularly limited, but the heat radiating member or the circuit board on which the heat radiating component is mounted is passed through the heat conductive silicone gel composition or a cured product thereof.
- An example is a heat dissipation structure provided with.
- an electronic component which is a heat-dissipating component is mounted on a circuit board, and heat generated from the electronic component is dissipated through a thin film layer of a heat conductive silicone gel composition or a cured product thereof.
- the heat conductive silicone gel composition or a cured product thereof is sandwiched between the circuit board and the heat radiating member, and the thickness thereof is not particularly limited, but is in the range of 0.1 to 2 mm. Even so, the heat generated from the electronic component filled with the composition without gaps can be efficiently transferred to the heat radiating member without slipping off.
- the electric / electronic device provided with the member made of the heat conductive silicone composition is not particularly limited, and is, for example, a secondary such as a cell type lithium ion electrode secondary battery and a cell stack type fuel cell. Batteries; Electronic circuit boards such as printed circuit boards; IC chips in which optical semiconductor elements such as diodes (LEDs), organic electric field elements (organic EL), laser diodes, and LED arrays are packaged; personal computers, digital video disks, and portable devices. CPUs used in electronic devices such as telephones and smartphones; LSI chips such as driver ICs and memories are exemplified.
- heat removal heat dissipation
- the heat conductive member made of the silicone gel composition has excellent heat dissipation and workability even when applied to power semiconductor applications such as engine control in transport machines, power train systems, and air conditioner control, and is electronic. Excellent heat resistance and thermal conductivity can be realized even when it is incorporated into an in-vehicle electronic component such as a control unit (ECU) and used in a harsh environment.
- ECU control unit
- the thermally conductive silicone gel composition according to the present invention can be suitably arranged not only on a horizontal surface but also on an inclined surface or a vertical surface by controlling its rheology, and can be appropriately arranged on an electric / electronic component or a battery. It is possible to provide a heat-dissipating structure without a gap by invading the fine structure of a heat-generating component such as a next battery. As a result, it does not easily slip off even if it is left vertically in a harsh temperature environment, and is therefore suitable as a heat radiating member and a protective material for an automobile control unit.
- the heat dissipation of the electric / electronic equipment equipped with the heat dissipation structure is improved, the problems of latent heat and thermal runaway are improved, and the partial structure of the electric / electronic equipment is protected by the flexible gel-like cured product. In some cases, its reliability and operational stability can be improved.
- thermally conductive silicone gel composition of the present invention can be applied to these substrates and used as both the thermally conductive silicone gel composition (fluid) before curing and the thermally conductive silicone gel composition. it can.
- the method of forming a heat-dissipating structure using the heat-conductive silicone gel composition of the present invention is not limited.
- the heat-conductive silicone gel composition of the present invention is applied to the heat-dissipating portion of electrical and electronic parts. Examples thereof include a method of curing this composition by pouring, sufficiently filling the gaps, and then heating the composition or leaving it at room temperature.
- a method of heating and curing the whole is preferable because the whole can be cured relatively quickly.
- the heating temperature becomes high, the generation of bubbles and cracks in the sealing or filling electric / electronic component sealing agent is promoted, so it is preferable to heat within the range of 50 to 250 ° C. In particular, it is preferable to heat in the range of 70 to 130 ° C.
- a fine particle platinum-containing hydrosilylation reaction catalyst dispersed or encapsulated with a thermoplastic resin may be used from the viewpoint of handling workability.
- the thermally conductive silicone gel composition of the present invention can be cured at room temperature or under heating of 50 ° C. or lower. In that case, after mixing, it is preferable to cure over 1 hour to several days at room temperature or heating at 50 ° C. or lower.
- the shape, thickness, arrangement, etc. of the thermally conductive silicone gel obtained by the above curing can be designed as desired, and may be cured as necessary after being filled in the gaps between electrical and electronic devices, and peeled off. It may be applied or cured on a film provided with a layer (separator) and handled alone as a heat-conducting silicone gel cured product on the film. Further, in that case, it may be in the form of a heat conductive sheet reinforced with a known reinforcing material.
- the heat conductive silicone gel composition of the present invention forms a gel-like heat conductive member having excellent gap fill property, flexibility and excellent heat conductivity, electrodes, electrodes and electric elements in electric / electronic components. It is also effective for electric elements, electric elements and packages with narrow gaps, and those with structures that do not easily follow the expansion and contraction of this silicone gel.
- ICs integrated circuits
- hybrid ICs etc.
- Semiconductor elements such as LSIs, electric circuits and modules equipped with electric elements such as semiconductor elements, capacitors, and electric resistors, various sensors such as pressure sensors, igniters and regulators for automobiles, power generation systems, or space transportation systems. It can also be used for power devices such as.
- the components (A) to (G) were mixed as follows to obtain the thermally conductive silicone gel compositions of Examples 1 to 3 and Comparative Examples 1 to 6. Then, a frame having a height of 15 mm, a length of 100 mm, and a width of 50 mm was created on a polypropylene sheet using a polyethylene backer, and the obtained composition was filled therein so that the Teflon (registered trademark) sheet was smoothed on the frame. It was pressed and cured as it was in an atmosphere of 25 ° C. for 1 day. After curing, the Teflon (registered trademark) sheet and the polyethylene backer were removed to obtain a thermally conductive silicone gel composition.
- the thermally conductive silicone gel composition obtained by the number of copies shown in Examples 1 to 4 and Comparative Examples 1 to 6 contains the component (D) so as to obtain a thermal conductivity of 5.0 W / mK.
- This thermal conductivity is a value measured by a hot disk method by cutting the cured product obtained above into two using TPS-500 manufactured by Kyoto Electronics Industry Co., Ltd.
- the test for the effect related to the present invention was conducted as follows.
- the viscosity, discharge rate, oil oozing distance, and curability of the thermally conductive silicone composition were measured as follows.
- [viscosity] The viscosity (Pa ⁇ s) of the thermally conductive silicone composition at 25 ° C. was measured using a flow tester CFT-500EX manufactured by SHIMAZU.
- the capillary die was carried out with a diameter of 1 mm, a stroke of 15 mm, and a test load of 30 kg.
- the heat conductive silicone gel composition is prepared by filling a 25 cc twin cartridge manufactured by Eddie Y Co., Ltd.
- the discharge amount (cc / 10 min) of the thermally conductive silicone composition at 25 ° C. was measured using a flow tester CFT-500EX manufactured by SHIMAZU. It was carried out under the same conditions as the above viscosity measurement.
- [Oil exudation distance] Kim towel (Nippon Paper Crecia Co., Ltd.) cut to the same size is placed on the frosted glass surface of single-sided frosted glass with a length of 50 mm, a width of 50 mm, and a thickness of 1 mm, with the rough side facing up, and then 50 mm in length, 50 mm in width, and thickness.
- a PTFE plate with a hole of 3 mm and a diameter of 10 mm was placed in the center, and both ends were fixed with clips.
- the hole in the center was filled with a thermally conductive silicone gel composition without any gaps, the surface was scraped with a spatula, and the mixture was cured at 25 ° C. for 24 hours with this surface facing up. Then, the oil seepage distance from the back surface of the frosted glass was measured in the vertical direction and the horizontal direction, and the average value was calculated.
- the exudation distance should be within twice (20 mm) of the diameter of 10 mm. If the exudation distance is longer than that, the composition components are likely to be separated in the static mixer.
- a heat conductive silicone gel composition is extruded from a hand gun equipped with a static mixer MA6.3-12-S on a PP film having a thickness of about 0.1 mm cut into a length of 50 mm and a width of 50 mm and weighed. did. Then, a PP film of the same size was placed from above and crushed to a thickness of about 1 mm. Twenty shots were repeatedly ejected from the static mixer to prepare 20 test specimens. After curing at 25 ° C. for 24 hours, the PP film was peeled off to confirm the curability.
- the composition of the present invention is formed by the following components.
- the degree of siloxane polymerization of the polysiloxane which is the component (A) is a calculated value of the degree of polymerization of the siloxane unit based on the number average molecular weight of each siloxane obtained by NMR.
- A-1-1 Dimethylvinylsiloxy group-blocking dimethylpolysiloxane at both ends of the molecular chain (viscosity 60 mPa ⁇ s, Vi content 1.53% by mass, degree of polymerization 96) non-A-1-2: Dimethylvinylsiloxy group-blocking dimethylpolysiloxane at both ends of the molecular chain (viscosity 400 mPa ⁇ s, Vi content 0.43% by mass, degree of polymerization 206)
- A-2-1 Dimethylvinylsiloxy group-blocking dimethylpolysiloxane at both ends of the molecular chain (viscosity 10,000 mPa ⁇ s, Vi content 0.14% by mass, degree of polymerization 540)
- A-2-2 Dimethylvinylsiloxy group-blocking dimethylpolysiloxane at both ends of the molecular chain (viscosity 42,000 mPa ⁇ s, Vi content 0.09% by mass,
- non-B-2 trimethylsiloxy group-blocking methylhydrogensiloxane / dimethylsiloxane copolymer at both ends of the molecular chain, containing an average of 5 in the molecule and an average of 5 in the side chain of the molecular chain (viscosity 5 mPa ⁇ s, Si—H) Amount 0.75% by mass)
- D-1 Crushed aluminum oxide powder with an average particle diameter of 0.4 ⁇ m
- D-2 Crushed aluminum oxide powder with an average particle diameter of 2.5 ⁇ m
- D-3 Spherical melt-solidified aluminum oxide powder with an average particle diameter of 35 ⁇ m
- F-1 Polyorganosiloxane represented by the following formula
- Example 1 100 parts by mass of component (A-1-1), 4.3 parts by mass of component (A-2-1), 12.8 parts by mass of component (E-1), 12.8 parts by mass of component (F-1) Weighed, and over 60 minutes, 427 parts by mass of component (D-1), 427 parts by mass of component (D-2), and 1154 parts by mass of component (D-3) were sequentially mixed. After homogenizing, the mixture was heated and mixed at 160 ° C. for 90 minutes under reduced pressure, and then cooled to room temperature to obtain a mixture. 0.486 parts by mass of the component (C-1) was mixed with this mixture to obtain the liquid (I) of the heat conductive silicone composition.
- a solution (II) of a thermally conductive silicone composition was uniformly mixed to obtain a solution (II) of a thermally conductive silicone composition.
- the heat conductive silicone composition was filled in a 25 cc twin cartridge manufactured by Eddie Y Co., Ltd. by separating the solution (I) and the solution (II).
- a static mixer MA6.3-12-S was attached to the tip, and the viscosity and discharge amount were measured with a flow tester CFT-500EX manufactured by SHIMAZU while extruding and mixing with a hand gun. Subsequently, the oil exudation distance, curability, and appearance after curing were confirmed.
- the viscosity [A-1] [A-2] / viscosity [A-1] of this composition was 1.23 (mixed viscosity 75 mPa ⁇ s).
- Example 2 The thermally conductive silicone composition was the same as in Example 1 except that 4.3 parts by mass of the component (A-2-1) of Example 1 was replaced with 4.3 parts by mass of the component (A-2-2). Liquid (I) and liquid (II) were obtained.
- the heat conductive silicone composition was filled in a 25 cc twin cartridge manufactured by Eddie Y Co., Ltd. by separating the solution (I) and the solution (II).
- a static mixer MA6.3-12-S was attached to the tip, and the viscosity and discharge amount were measured with a flow tester CFT-500EX manufactured by SHIMAZU while extruding and mixing with a hand gun. Subsequently, the oil exudation distance, curability, and appearance after curing were confirmed.
- the viscosity [A-1] [A-2] / viscosity [A-1] of this composition was 1.31 (mixed viscosity 80 mPa ⁇ s).
- Example 3 The thermally conductive silicone composition was the same as in Example 1 except that 4.3 parts by mass of the component (A-2-1) of Example 1 was replaced with 8.5 parts by mass of the component (A-2-2). Liquid (I) and liquid (II) were obtained.
- the heat conductive silicone composition was filled in a 25 cc twin cartridge manufactured by Eddie Y Co., Ltd. by separating the solution (I) and the solution (II).
- a static mixer MA6.3-12-S was attached to the tip, and the viscosity and discharge amount were measured with a flow tester CFT-500EX manufactured by SHIMAZU while extruding and mixing with a hand gun. Subsequently, the oil exudation distance, curability, and appearance after curing were confirmed.
- the viscosity [A-1] [A-2] / viscosity [A-1] of this composition was 1.67 (mixed viscosity 100 mPa ⁇ s).
- Example 4 Thermally conductive silicone as in Example 1 except that 4.3 parts by mass of the component (A-2-1) of Example 1 was replaced with 1.5 parts by mass of the component (A-2-3). Liquids (I) and (II) of the composition were obtained.
- the heat conductive silicone composition was filled in a 25 cc twin cartridge manufactured by Eddie Y Co., Ltd. by separating the solution (I) and the solution (II).
- a static mixer MA6.3-12-S was attached to the tip, and the viscosity and discharge amount were measured with a flow tester CFT-500EX manufactured by SHIMAZU while extruding and mixing with a hand gun. Subsequently, the oil exudation distance, curability, and appearance after curing were confirmed.
- the viscosity [A-1] [A-2] / viscosity [A-1] of this composition was 1.98 (mixed viscosity 119 mPa ⁇ s).
- Example 5 Thermally conductive silicone as in Example 1 except that 4.3 parts by mass of the component (A-2-1) of Example 1 was replaced with 4.0 parts by mass of the component (A-2-3). Liquids (I) and (II) of the composition were obtained.
- the heat conductive silicone composition was filled in a 25 cc twin cartridge manufactured by Eddie Y Co., Ltd. by separating the solution (I) and the solution (II).
- a static mixer MA6.3-12-S was attached to the tip, and the viscosity and discharge amount were measured with a flow tester CFT-500EX manufactured by SHIMAZU while extruding and mixing with a hand gun. Subsequently, the oil exudation distance, curability, and appearance after curing were confirmed.
- the viscosity [A-1] [A-2] / viscosity [A-1] of this composition was 5.17 (mixed viscosity 310 mPa ⁇ s).
- the thermally conductive silicone composition (I) was the same as in Comparative Example 1 except that 100 parts by mass of the component (A-1-1) of Comparative Example 1 was replaced with 100 parts by mass of the component (non-A-1-2). ) Liquid and (II) liquid were obtained.
- the heat conductive silicone composition was filled in a 25 cc twin cartridge manufactured by Eddie Y Co., Ltd. by separating the solution (I) and the solution (II).
- a static mixer MA6.3-12-S was attached to the tip, and the viscosity and discharge amount were measured with a flow tester CFT-500EX manufactured by SHIMAZU while extruding and mixing with a hand gun. Subsequently, the oil exudation distance, curability, and appearance after curing were confirmed.
- This composition does not contain both component (A-1) and component (A-2).
- Comparative Example 3 Comparative Example 1 except that 100 parts by mass of the component (A-1-1) of Comparative Example 1 was replaced with 68 parts by mass of the component (A-1-1) and 32 parts by mass of the component (non-A-1-2).
- liquids (I) and (II) of the heat conductive silicone composition were obtained.
- the heat conductive silicone composition was filled in a 25 cc twin cartridge manufactured by Eddie Y Co., Ltd. by separating the solution (I) and the solution (II).
- a static mixer MA6.3-12-S was attached to the tip, and the viscosity and discharge amount were measured with a flow tester CFT-500EX manufactured by SHIMAZU while extruding and mixing with a hand gun.
- This composition did not contain the component (A-2) and had a viscosity [A-1] [A-2] / viscosity [A-1] of 1.00 (mixed viscosity 110 mPa ⁇ s).
- Example 6 Thermally conductive silicone composition as in Example 1 except that 4.3 parts by mass of the component (A-2-1) of Example 1 was replaced with 4.3 parts by mass of the component (non-A-1-2). Liquids (I) and (II) of the product were obtained.
- the heat conductive silicone composition was filled in a 25 cc twin cartridge manufactured by Eddie Y Co., Ltd. by separating the solution (I) and the solution (II).
- a static mixer MA6.3-12-S was attached to the tip, and the viscosity and discharge amount were measured with a flow tester CFT-500EX manufactured by SHIMAZU while extruding and mixing with a hand gun.
- This composition did not contain the component (A-2) and had a viscosity [A-1] [A-2] / viscosity [A-1] of 1.00 (mixed viscosity 65 mPa ⁇ s).
- each thermally conductive silicone according to the present invention when the viscosity [A-1] [A-2] / viscosity [A-1] is in the range of 1.15 to 5.50, each thermally conductive silicone according to the present invention.
- the gel composition (design value of thermal conductivity: 5.0 W / mK) has less oil oozing before both liquid (I) and liquid (II) are cured, and is good and practical for mixing with a static mixer. It showed sufficient mixability and stable curability.
- the viscosities [A-1] [A-2] / viscosities [A-1] shown in Examples 1 to 4 are in the range of 1.20 to 2.00, and the mixed viscosity of both is 150 mPa. It was confirmed that the thermally conductive silicone gel composition having a viscosity of s or less was extremely excellent in dischargeability in addition to the above-mentioned characteristics, and was excellent in handling workability and stability.
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Abstract
Description
(A)以下の成分(A-1)および成分(A-2)からなるアルケニル基含有オルガノポリシロキサン
(A-1)シロキサン重合度が5~100の範囲であるアルケニル基含有オルガノポリシロキサン、
(A-2)シロキサン重合度が400以上であるアルケニル基含有オルガノポリシロキサン、
、 (B)オルガノハイドロジェンポリシロキサン:成分(A)に含まれるアルケニル基1モルに対して、成分(B)中のケイ素原子結合水素原子が0.2~5モルとなる量、
(C)触媒量のヒドロシリル化反応用触媒、
(D)熱伝導性充填剤、
(E)1種類以上のシランカップリング剤またはその加水分解縮合物、および
(F)分子鎖末端に加水分解性シリル基を有するオルガノポリシロキサン
を含有する(I)液および(II)液からなり、
(I)液中における成分(D)の含有量が、成分(A-1)100質量部に対して、600~3,500質量部であり、
(II)液中における成分(D)の含有量が、成分(A-1)100質量部に対して、600~3,500質量部であり、かつ、
成分(A-1)と成分(A-2)が同一系内に存在し、これら混合ポリマーの25℃における粘度が、成分(A-1)の25℃における粘度の1.15~5.5倍の範囲内である、多成分型熱伝導性シリコーンゲル組成物によって解決される。
また、当該組成物にあって、上記の(I)液および(II)液中の成分(D)の含有量が、各々の組成物全体の80~98質量%の範囲であり、成分(D)以外の充填剤を実質的に含まないことが好ましい。さらに、当該組成物が、熱伝導率が2.0W/mK以上、好適には、3.5W/mK以上、より好適には4.0W/mK以上であることが好ましい。
成分(F)が、下記一般式(1)または一般式(2)で表されるオルガノポリシロキサン、またはそれらの混合物である、請求項1~請求項3のいずれか1項に記載の多成分型熱伝導性シリコーンゲル組成物。
(i) 一般式(1):
(式中、R1は独立に非置換または置換の一価炭化水素基であり、R2は独立に水素原子、アルキル基、アルコキシアルキル基、またはアシル基であり、aは5~250の整数であり、bは1~3の整数である。)で表され、25℃における粘度が10~10,000mPa・s未満であるオルガノポリシロキサン
(ii) 一般式(2):R4 3SiO(R4 2SiO)pR4 2Si-R5-SiR4 (3-d)(OR3)d (2)
(式中、R4は同種もしくは異種の一価炭化水素基であり、R5は酸素原子または二価炭化水素基であり、R3は前記と同様の基であり、pは100~500の整数であり、dは前記と同様の整数である。)で表されるオルガノポリシロキサン
本発明に係る組成物は、
(A)以下の成分(A-1)および成分(A-2)からなるアルケニル基含有オルガノポリシロキサン
(A-1)シロキサン重合度が5~100の範囲であるアルケニル基含有オルガノポリシロキサン、
(A-2)シロキサン重合度が400以上であるアルケニル基含有オルガノポリシロキサン、
(B)オルガノハイドロジェンポリシロキサン、(C)ヒドロシリル化反応用触媒、(D)熱伝導性充填剤、(E)1種類以上のシランカップリング剤またはその加水分解縮合物、(F)分子鎖末端に加水分解性シリル基を有するオルガノポリシロキサンを含有してなり、個別に保存される以下の(I)液および(II)液を少なくとも含む多成分型熱伝導性シリコーンゲル組成物である。ここで、成分(A-1)は好適には、25℃における粘度が10~100mPa・sであるアルケニル基含有オルガノポリシロキサンであり、成分(A-2)は好適には、25℃における粘度が10,000mPa・s以上であるアルケニル基含有オルガノポリシロキサンであり、これら混合ポリマーの25℃における粘度が、成分(A-1)の25℃における粘度の1.15~5.5倍の範囲内である。
(I)液は、本組成物の主剤である、アルケニル基含有オルガノポリシロキサンを含む組成物であり、前記の成分(A-1)、(A-2)、(C)、(D)、(E)および(F)を含み、成分(B)を含まない組成物であることが必要であり、任意で成分(G)またはその他の成分を含んでも良い。
(II)液は、本組成物の架橋剤である、オルガノハイドロジェンポリシロキサンを含む組成物であり、前記の成分成分(A-1)、(A-2)、(B)、(D)、(E)および(F)を含み、成分(C)を含まない組成物であることが必要であり、任意で成分(G)またはその他の成分を含んでも良い。 また、任意で成分(A-1)、(A-2)を含まなくてもよい。
成分(A)であるアルケニル基含有オルガノポリシロキサンは、(A-1)シロキサン重合度が5~100の範囲であるアルケニル基含有オルガノポリシロキサン、および(A-2)シロキサン重合度が400以上であるアルケニル基含有オルガノポリシロキサンからなる。ここで、シロキサン重合度は、NMRを用いて得られるオルガノポリシロキサンの数平均分子量から計算されるシロキサン単位の個数である。
で表されるアルコキシシリル含有基を有しても良い。これらの官能基を有するオルガノポリシロキサンは、未硬化状態における組成物の増粘を抑制し、かつ分子中にアルコキシシリル基を有するため、成分(D)の表面処理剤としても機能する。このため、得られる組成物の増粘やオイルブリードが抑制され、取扱作業性が損なわれないという恩恵を得られる場合がある。
成分(B)は、上記の(II)液の構成成分であり、本発明の熱伝導性シリコーンゲル組成物の主たる架橋剤であり、分子内に2個以上のケイ素原子結合水素原子を有するオルガノハイドロジェンポリシロキサンが特に制限なく利用できるが、得られる熱伝導性シリコーンゲル硬化物の柔軟性および垂直保持性の見地から、オルガノハイドロジェンポリシロキサンの分子中のケイ素原子結合水素原子の個数(平均値)は8個を超えない範囲が好ましい。
本発明の組成物は、成分(B)について、少なくとも成分(A)に含まれるアルケニル基1モルに対して、成分(B)中のケイ素原子結合水素原子が0.2~5モルとなる量の範囲にあることが必要であり、0.3~2.0モルとなる量、または0.4~1.0モルとなる量の範囲であることが、得られる熱伝導性シリコーンゲル硬化物の形成および同硬化物の剥離性およびリペア性の見地から、特に好ましい。具体的には、成分(B)中のケイ素原子結合水素原子の含有量が前記下限未満では、熱伝導性シリコーンゲル組成物の硬化不良の原因となる場合があり、前記上限を超えると、ケイ素原子結合水素原子の量が過剰となって、同硬化物の剥離性およびリペア性が損なわれる場合がある。
本発明にかかる組成物を硬化して得られる熱伝導性シリコーンゲル硬化物の剥離性、リペア性の見地から、成分(B)は、(B1)25℃における粘度が1~1,000mPa・sであり、分子内に平均して2~4個のケイ素原子結合水素原子を含有し、そのうち、少なくとも2個を分子鎖側鎖に有する直鎖状のオルガノハイドロジェンポリシロキサンを少なくとも含むことが好ましい。なお、上記の成分(B1)の構造は、成分(B1)が本組成物において、分子鎖側鎖上のケイ素原子結合水素原子のヒドロシリル化反応により架橋延長剤として機能することを意味する。
本発明の成分(B)は、成分(B1)以外のオルガノハイドロジェンポリシロキサン、例えば、分子内のケイ素原子結合水素原子を平均して4個を超える数含む分子鎖両末端トリメチルシロキシ基封鎖メチルハイドロジェンシロキサン・ジメチルシロキサン共重合体、分子内のケイ素原子結合水素原子を平均して4個を超える数含む分子鎖両末端ジメチルハイドロジェンシロキシ基封鎖メチルハイドロジェンシロキサン・ジメチルシロキサン共重合体、分子鎖両末端トリメチルシロキシ基封鎖メチルハイドロジェンポリシロキサン、分子鎖両末端ジメチルハイドロジェンシロキシ基封鎖ジメチルポリシロキサン、メチルハイドロジェンシロキシ基含有シロキサンレジン等を架橋剤として含んでも良い。しかしながら、少なくとも、上記の量の成分(B1)を、架橋延長剤として含むことが好適であり、その他のオルガノハイドロジェンポリシロキサンを併用する場合であっても、本発明の組成物の硬化特性および硬化物の剥離性およびリペア性の見地から、成分(B1)の比率が一定量以上であることが好ましい。
(B’1): 成分(B1)のみ、または、組成中に意図的に他のオルガノハイドロジェンポリシロキサンが配合されておらず、実質的に成分(B1)のみ
(B’2):成分(B1)に加えて、
分子鎖両末端ジメチルハイドロジェンシロキシ基封鎖ジメチルポリシロキサン、
分子内のケイ素原子結合水素原子を平均して5~8個含む分子鎖両末端トリメチルシロキシ基封鎖メチルハイドロジェンシロキサン・ジメチルシロキサン共重合体、および
分子内のケイ素原子結合水素原子を平均して5~8個含む分子鎖両末端ジメチルハイドロジェンシロキシ基封鎖メチルハイドロジェンシロキサン・ジメチルシロキサン共重合体
から選ばれる1種類又は2種類以上を含有する、オルガノハイドロジェンポリシロキサン混合物
ただし、仮に上記の成分(B’2)を用いる場合であっても、[Hnon-B1]/ ([HB1]+[Hnon-B1])の値は上記同様の範囲であることが好ましい。
ヒドロシリル化反応用触媒は、上記の(I)液の構成成分であり、白金系触媒、ロジウム系触媒、パラジウム系触媒が例示され、本組成物の硬化を著しく促進できることから白金系触媒が好ましい。この白金系触媒としては、白金微粉末、塩化白金酸、塩化白金酸のアルコール溶液、白金-アルケニルシロキサン錯体、白金-オレフィン錯体、白金-カルボニル錯体、およびこれらの白金系触媒を、シリコーン樹脂、ポリカーボネート樹脂、アクリル樹脂等の熱可塑性樹脂で分散あるいはカプセル化した触媒が例示され、特に、白金-アルケニルシロキサン錯体が好ましい。このアルケニルシロキサンとしては、1,3-ジビニル-1,1,3,3-テトラメチルジシロキサン、1,3,5,7-テトラメチル-1,3,5,7-テトラビニルシクロテトラシロキサン、これらのアルケニルシロキサンのメチル基の一部をエチル基、フェニル基等で置換したアルケニルシロキサン、これらのアルケニルシロキサンのビニル基をアリル基、ヘキセニル基等で置換したアルケニルシロキサンが例示される。特に、この白金-アルケニルシロキサン錯体の安定性が良好であることから、1,3-ジビニル-1,1,3,3-テトラメチルジシロキサンであることが好ましい。加えて、取扱作業性および組成物のポットライフの改善の見地から、熱可塑性樹脂で分散あるいはカプセル化した微粒子状の白金含有ヒドロシリル化反応触媒を用いてもよい。なお、ヒドロシリル化反応を促進する触媒としては、鉄、ルテニウム、鉄/コバルトなどの非白金系金属触媒を用いてもよい。
本発明の組成物には、その取扱作業性の見地から、さらにヒドロシリル化反応抑制剤を含むことが好ましい。ヒドロシリル化反応抑制剤は、本発明の熱伝導性シリコーンゲル組成物のヒドロシリル化反応を抑制するための成分であって、具体的には、例えば、エチニルシクロヘキサノールのようなアセチレン系、アミン系、カルボン酸エステル系、亜リン酸エステル系等の反応抑制剤が挙げられる。反応抑制剤の添加量は、通常、シリコーンゲル組成物全体の0.001~5質量%である。特に、シリコーンゲル組成物の取扱作業性を向上させる目的では、3-メチル-1-ブチン-3-オール、3,5-ジメチル-1-ヘキシン-3-オール、3-フェニル-1-ブチン-3-オール等のアセチレン系化合物;3-メチル-3-ペンテン-1-イン、3,5-ジメチル-3-ヘキセン-1-イン等のエンイン化合物;1,3,5,7-テトラメチル-1,3,5,7-テトラビニルシクロテトラシロキサン、1,3,5,7-テトラメチル-1,3,5,7-テトラヘキセニルシクロテトラシロキサン等のシクロアルケニルシロキサン;ベンゾトリアゾール等のトリアゾール化合物等が特に制限なく使用することができる。
成分(D)は、上記の(I)液および(II)液に共通する構成成分であり、本組成物および本組成物を硬化させてなる熱伝導性部材に熱伝導性を付与するための熱伝導性充填剤である。このような成分(D)としては、純金属、合金、金属酸化物、金属水酸化物、金属窒化物、金属炭化物、金属ケイ化物、炭素、軟磁性合金及びフェライトからなる群から選ばれた、少なくとも1種以上の粉末及び/又はファイバーであることが好ましく、金属系粉末、金属酸化物系粉末、金属窒化物系粉末、または炭素粉末が好適である。
電気絶縁性が求められる場合には、金属酸化物系粉末、または金属窒化物系粉末であることが好ましく、特に、酸化アルミニウム粉末、酸化亜鉛粉末、または窒化アルミニウム粉末であることが好ましい。
本発明の組成物は、任意成分として、例えば、ヒュームドシリカ、湿式シリカ、粉砕石英、酸化チタン、炭酸マグネシウム、酸化亜鉛、酸化鉄、ケイ藻土、カーボンブラック等の無機充填剤(「無機充填材」ともいう)、こうした無機充填剤の表面を有機ケイ素化合物(シラザン類等)により疎水処理してなる無機充填剤を配合することを完全に妨げられるものではないが、本発明の技術的効果、特に、高い熱伝導性およびギャップフィル性を両立する見地からは、成分(D)以外の充填剤を実質的に含まないことが好ましい。特に、補強性シリカ類のような広いBET比表面積を持った補強性充填剤を本組成に配合した場合、3.5W/km以上の熱伝導性を与える量の成分(D)を組成中に配合して、本発明に特徴的なレオロジー特性を実現することが困難となる場合がある。なお、「実質的に含まない」とは、組成中における成分(D)以外の充填剤の含有量が1質量%未満であることが好ましく、0.5質量%未満であることがより好ましい。なお、最も好適には、成分(D)以外の充填剤の意図的な添加量が組成中に0.0質量%であることである。
本組成物は、化学的構造の異なる2種類の表面処理剤:成分(E)および成分(F)を特定量含有するものである。具体的には、本発明の成分(D)全体を100質量%とした場合、これらの成分が0.1~5.0質量%の範囲で配合されており、成分(D)がこれらの成分により表面処理されていることが好ましい。成分(D)の表面処理工程は任意であるが、本組成物の流動性、ギャップフィル性およびチクソトロピー性の改善の見地から、特に成分(E)により、成分(D)の少なくとも一部が表面処理され、次いで、成分(F)により成分(D)が表面処理されている工程が好適に例示される。
成分(E)は成分(D)の表面処理剤であり、上記の(I)液および(II)液に共通する構成成分であり、成分(D)の配合量を改善し、かつ、組成物全体の粘度および流動性を改善する成分である。このような成分(E)は公知のシランカップリング剤またはその加水分解縮合物を特に制限なく使用することができるが、特に、後述する成分(E1):分子内に炭素原子数6以上のアルキル基を有するアルコキシシランを含むことが好適である。
R1 (4-c)Si(OR2)c
で表される。式中、R1は、一価炭化水素基、エポキシ基含有有機基、メタクリル基含有有機基、またはアクリル基含有有機基である。R1の一価炭化水素基としては、メチル基、エチル基、プロピル基、ブチル基、ヘキシル基、デシル基等の直鎖状アルキル基;イソプロピル基、ターシャリーブチル基、イソブチル基等の分岐鎖状アルキル基;シクロヘキシル基等の環状アルキル基;ビニル基、アリル基、ブテニル基、ペンテニル基、ヘキセニル基、ヘプテニル基等のアルケニル基;フェニル基、トリル基、キシリル基等のアリール基;ベンジル基、フェネチル基等のアラルキル基;3,3,3-トリフルオロプロピル基、3-クロロプロピル基等のハロゲン化アルキル基等の置換もしくは非置換の一価炭化水素基が例示される。また、R4のエポキシ基含有有機基としては、3-グリシドキシプロピル基、4-グリシドキシブチル基等のグリシドキシアルキル基;2-(3,4-エポキシシクロヘキシル)エチル基、3-(3,4-エポキシシクロヘキシル)プロピル基等のエポキシシクロヘキシルアルキル基が例示される。また、R1のメタクリル基含有有機基としては、3-メタクリロキシプロピル基、4-メタクリロキシブチル基等のメタクリロキシアルキル基が例示される。また、R1のアクリル基含有有機基としては、3-アクリロキシプロピル基、4-アクリロキシシブチル基等のアクリロキシアルキル基が例示される。
成分(E1)は、成分(B1)と共に本組成物における好適な成分であり、分子内に炭素原子数6以上のアルキル基を有するアルコキシシランである。ここで、炭素原子数6以上のアルキル基の具体例としてはヘキシル基、オクチル基、ドデシル基、テトラデシル基、ヘキサデシル基、オクタデシル基等のアルキル基やベンジル基、フェニルエチル基等のアラルキル基などが挙げられるが、特に炭素数6~20のアルキル基が好ましい。炭素原子数6未満のアルキル基を有するアルコキシシランの場合、組成物の粘度を低下させる効果が不十分であり、組成物の粘度が上昇して、所望の流動性およびギャップフィル性が実現できない場合がある。また、炭素原子数20以上のアルキル基等を有するアルコキシシランを用いた場合、工業的供給性に劣るほか、成分(A)の種類によっては、相溶性が低下する場合がある。
YnSi(OR)4-n
(式中、Yは炭素原子数6~18のアルキル基であり、Rは炭素原子数1~5のアルキル基であり、nは1または2の数である)
で表されるアルコキシシランであり、OR基としてメトキシ基、エトキシ基、プロポキシ基、ブトキシ基などが例示され、特にメトキシ基及びエトキシ基が好ましい。また、nは1,2又は3であり、特に1であることが好ましい。
成分(F)は、上記の(I)液および(II)液に共通する構成成分であり、成分(E)と異なり、分子鎖片末端に加水分解性シリル基を有し、かつ、ポリシロキサン構造を有する表面処理剤であり、成分(D)を成分(E)と併用して処理、好適には、成分(E)で表面処理した後に、次いで、成分(F)による表面処理を行うことにより、成分(D)である熱伝導性充填剤が大量に配合されても、本組成物の流動性、ギャップフィル性およびチクソトロピー性が改善された熱伝導性シリコーンゲル組成物を提供することができる。
(i) 一般式(1):
(式中、R1は独立に非置換または置換の一価炭化水素基であり、R2は独立に水素原子、アルキル基、アルコキシアルキル基、またはアシル基であり、aは5~250の整数であり、bは1~3の整数である。)で表され、25℃における粘度が10~10,000mPa・s未満であるオルガノポリシロキサン
(ii) 一般式(2):R4 3SiO(R4 2SiO)pR4 2Si-R5-SiR4 (3-d)(OR3)d (2)
(式中、R4は同種もしくは異種の一価炭化水素基であり、R5は酸素原子または二価炭化水素基であり、R3は前記と同様の基であり、pは100~500の整数であり、dは前記と同様の整数である。)で表されるオルガノポリシロキサン
一般式(1)中、R1は独立に非置換または置換の一価の炭化水素基であり、その例としては、直鎖状アルキル基、分岐鎖状アルキル基、環状アルキル基、アルケニル基、アリール基、アラルキル基、ハロゲン化アルキル基が挙げられる。直鎖状アルキル基としては、例えば、メチル基、エチル基、プロピル基、ヘキシル基、オクチル基が挙げられる。分岐鎖状アルキル基としては、例えば、イソプロピル基、イソブチル基、tert-ブチル基、2-エチルヘキシル基が挙げられる。環状アルキル基としては、例えば、シクロペンチル基、シクロヘキシル基が挙げられる。アルケニル基としては、例えば、ビニル基、アリル基が挙げられる。アリール基としては、例えば、フェニル基、トリル基が挙げられる。アラルキル基としては、例えば、2-フェニルエチル基、2-メチル-2-フェニルエチル基が挙げられる。ハロゲン化アルキル基としては、例えば、3,3,3-トリフルオロプロピル基、2-(ノナフルオロブチル)エチル基、2-(ヘプタデカフルオロオクチル)エチル基が挙げられる。R1は好ましくはメチル基、フェニル基である。
本発明組成物は、(I)液および(II)液に、前記の成分(A)~(F)、任意で他の架橋剤およびヒドロシリル化反応抑制剤を含んでなるものであるが、混合後の熱伝導性シリコーンゲル組成物およびその硬化物の耐熱性改善の見地から、さらに、(G)耐熱性付与剤を含有することが好ましい。なお、成分(G)は、(I)液および(II)液から選ばれるどちらか一方に配合してもよく、本組成物を3成分以上に設計した場合は、独立した1成分として添加してもよい。成分(G)として、本発明の組成物およびその硬化物に耐熱性を付与できるものならば特に限定されないが、例えば、酸化鉄、酸化チタン、酸化セリウム、酸化マグネシウム、酸化亜鉛等の金属酸化物、水酸化セリウム等の金属水酸化物、フタロシアニン化合物、セリウムシラノレ-ト、セリウム脂肪酸塩、オルガノポリシロキサンとセリウムのカルボン酸塩との反応生成物等が挙げられる。特に好適には、フタロシアニン化合物であり、例えば、特表2014-503680号公報に開示された無金属フタロシアニン化合物及び金属含有フタロシアニン化合物からなる群より選択される添加剤が好適に用いられ、金属含有フタロシアニン化合物のうち、銅フタロシアニン化合物が特に好適である。最も好適かつ非限定的な耐熱性付与剤の一例は、29H,31H-フタロシアニナト(2-)-N29,N30,N31,N32銅である。このようなフタロシアニン化合物は市販されており、例えば、PolyOne Corporation(Avon Lake,Ohio,USA)のStan-tone(商標)40SP03がある。
本発明の熱伝導性シリコーンゲル組成物は、上記した成分以外にも、本発明の目的を損なわない範囲で任意成分を配合することができる。この任意成分としては、例えば、ケイ素原子結合水素原子およびケイ素原子結合アルケニル基を含有しないオルガノポリシロキサン、耐寒性付与剤、難燃性付与剤、顔料、染料等が挙げられる。また、本発明の熱伝導性シリコーンゲル組成物は、所望により、公知の接着性付与剤、カチオン系界面活性剤、アニオン系界面活性剤、または非イオン系界面活性剤などからなる1種類以上の帯電防止剤;誘電性フィラー;電気伝導性フィラー;離型性成分;チクソ性付与剤;防カビ剤などを含むことができる。また、所望により、有機溶媒を添加してもよい。これらの添加剤は、(I)液および(II)液から選ばれるどちらか一方に配合してもよく、本組成物を3成分以上に設計した場合は、独立した1成分として添加してもよい。
本発明の熱伝導性シリコーンゲル組成物は、上記の各成分を混合することにより調製でき、例えば(I)液の場合、事前に成分(A-1)、成分(A-2)、成分(D)、成分(E)、成分(F)を混合し、成分(D)の表面を成分(E)と成分(F)で処理した後、成分(C)、必要に応じて成分(G)、並びに他の任意の成分を混合することにより調製できる。
本発明の熱伝導性シリコーンゲル組成物は、分液した多成分を使用時に混合する多成分型(多液型、特に二液型を含む)の組成物であり、個別に保存される複数の組成物を所定の比率で混合して使用することができる。なお、これらのパッケージは、後述する硬化方法や塗布手段、適用対象に応じて所望により選択することができ、特に制限されない。
本発明の熱伝導性シリコーンゲル組成物は、ヒドロシリル化反応により硬化して、熱伝導性に優れたシリコーンゲル硬化物を形成する。このヒドロシリル化反応硬化型のシリコーンゲル組成物を硬化するための温度条件は、特に限定されないが、通常20℃~150℃の範囲内であり、より好ましくは20~80℃の範囲内である。所望により、高温短時間で硬化させてもよく、室温等の低温で長時間(例えば数時間~数日)かけて硬化させてもよく、特に制限されるものではない。
こうした範囲の硬度を持つシリコーンゲル硬化物は、低弾性率および低応力といったシリコーンゲルの特徴を有するものになる。一方、硬度が70より大きい場合には、発熱部材との密着性は優れるものの、追従性が悪くなる恐れがあり、硬度が2未満の場合には追従性に優れるものの、発熱部材の固定性が悪くなる恐れがある。
本発明の熱伝導性シリコーンゲル組成物は、熱伝導性充填剤を安定的に高充填することができ、2.0W/mK以上、好適には3.5W/mK以上、より好適には4.0W/mK以上、特に好適には5.0W/mKの熱伝導率を備える。なお、本発明の熱伝導性シリコーンゲル組成物においては、4.0~7.0W/mKの組成物およびシリコーンゲル硬化物を設計可能であり、かつ、上記のギャップフィル性を実現可能である。
本発明の熱伝導性シリコーンゲル組成物は、熱伝導による発熱性部品の冷却のために、発熱性部品の熱境界面とヒートシンク又は回路基板等の放熱部材との界面に介在させる熱伝達材料(熱伝導性部材)として有用であり、これを備えた放熱構造体を形成することができる。ここで、発熱性部品の種類や大きさ、細部の構造は特に限定されるものではないが、本発明の熱伝導性シリコーンゲル組成物は、高い熱伝導性を有しながら部材へのギャップフィル性に優れ、微細な凹凸や狭いギャップ構造を有する発熱性部材に対しても密着性と追従性が高く、かつ、ゲル特有の柔軟性を併せ持つことから、電気・電子部品又はセル方式の二次電池類を含む電気・電子機器の放熱構造体に好適に適用される。
発熱性部品について、本発明の熱伝導性シリコーンゲル組成物を用いた放熱構造を形成する方法は限定されず、例えば、電気・電子部品について放熱部分に本発明の熱伝導性シリコーンゲル組成物を注ぎ、十分に間隙まで充填した後、これを加熱したり、室温で放置したりすることにより、この組成物を硬化させる方法が挙げられる。
本発明の熱伝導性シリコーンゲル組成物は、ギャップフィル性に優れ、柔軟かつ熱伝導性に優れたゲル状の熱伝導性部材を形成するので、電気・電子部品中の電極と電極、電気素子と電気素子、電気素子とパッケージ等の隙間が狭いものや、これらの構造がこのシリコーンゲルの膨張・収縮に追随しにくい構造を有するものに対しても有効であり、例えば、IC、ハイブリッドIC、LSI等の半導体素子、このような半導体素子、コンデンサ、電気抵抗器等の電気素子を実装した電気回路やモジュール、圧力センサー等の各種センサー、自動車用のイグナイターやレギュレーター、発電システム、または宇宙輸送システム等のパワーデバイス等に対しても使用することができる。
その後、ポリプロピレンシート上にポリエチレン製バッカーを用いて高さ15mm、縦100mm、横50mmの枠を作成、得られた組成物を充填し、上にテフロン(登録商標)製シートを平滑になるように押し付け、そのままの状態で25℃の雰囲気下で1日硬化させた。硬化後、テフロン(登録商標)製シートとポリエチレン製バッカーを外し、熱伝導性シリコーンゲル組成物を得た。
なお、熱伝導性シリコーン組成物の粘度、吐出量、オイル滲みだし距離、および硬化性を次のようにして測定した。
[粘度]
熱伝導性シリコーン組成物の25℃における粘度(Pa・s)を、SHIMAZU社製フローテスターCFT-500EXを用いて測定した。キャピラリーダイは直径1mm、ストローク15mm、試験荷重30kgで実施した。熱伝導性シリコーンゲル組成物はエディーワイ株式会社製25ccツインカートリッジに(I)液と(II)液を充填し、先端にスタティックミキサーMA6.3-12-Sを取り付け、ハンドガンで押し出し混合しながら試験容器内に充填した。測定時のシリンダ圧力は2.94×106(Pa)であった。
[混合ポリマー粘度]
混合ポリマーの25℃における粘度(Pa・s)を、アントンパール社製レオコンパスMCR102を用いて測定した。ジオメトリーは直径20mmのコーンプレートを用い、シェアレイト10.0(1/s)の値を測定した。
[吐出量]
熱伝導性シリコーン組成物の25℃における吐出量(cc/10min)を、SHIMAZU社製フローテスターCFT-500EXを用いて測定した。上記粘度測定と同じ条件で実施した。
[オイル滲みだし距離]
縦50mm、横50mm、厚さ1mmの片面すりガラスのすりガラス面に、同サイズにカットしたキムタオル(日本製紙クレシア株式会社)を粗い面を上にして乗せ、更にその上に縦50mm、横50mm、厚さ3mm、中央部に直径10mmの穴を開けたPTFE製の板を乗せ、両端をクリップで固定した。中央部の穴に熱伝導性シリコーンゲル組成物を隙間が無いように充填し、スパチュラで表面をかきとり、この面を上にした状態で25℃で24時間硬化させた。その後、すりガラスの裏面からオイルの滲みだし距離を縦方向と横方向で測定し、平均値を計算した。直径10mmに対して2倍(20mm)以内の滲みだし距離が理想である。それ以上の滲みだし距離の場合、スタティックミキサー内で組成物成分の分離が生じやすくなる。
[硬化性]
縦50mm、横50mmにカットした厚さ約0.1mmのPPフィルム上に0.5gの熱伝導性シリコーンゲル組成物を上記同様スタティックミキサーMA6.3-12-Sを取り付けたハンドガンから押し出して計量した。その後、上から同サイズのPPフィルムを乗せて約1mmの厚さになるように潰した。繰り返しスタティックミキサーから20ショット吐出し、20個の試験体を作成した。25℃で24時間硬化させた後、PPフィルムを剥がして硬化性を確認した。硬化した熱伝導性シリコーンゲル組成物が破損せずにPPフィルムが剥がれたものを合格とし、硬化した熱伝導性シリコーンゲル組成物が破壊したものを不合格とした。20個全て合格するのが、本発明の最終目的である。
[硬化後外観確認]
上記硬化性確認において、硬化した熱伝導性シリコーンゲル組成物の外観を確認した。(I)液と(II)液の色を変えて混合後の色の均一性を確認し、均一になっているものを合格、斑模様等が見られ、色が均一になっていないものを不合格とした。
成分(A):
以下、成分(A)であるポリシロキサンのシロキサン重合度は、NMRを用いて得られた各シロキサンの数平均分子量に基づくシロキサン単位の重合度の計算値である。
A-1-1:分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン(粘度 60mPa・s,Vi含有量 1.53質量%, 重合度96)
non-A-1-2:分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン(粘度 400mPa・s,Vi含有量 0.43質量%, 重合度206)
A-2-1:分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン(粘度10,000mPa・s,Vi含有量 0.14質量%, 重合度540)
A-2-2:分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン(粘度 42,000mPa・s,Vi含有量 0.09質量%, 重合度797)
A-2-3:分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルシロキサン(可塑度144,Vi含有量 0.01質量%, 重合度4470)
[可塑度]
可塑度は、JIS K 6249に規定される方法に準じて測定された値(25℃、4.2gの球状試料に1kgfの荷重を3分間かけたときの厚さを1/100mmまで読み、この数値を100倍したもの)で示した。
B-1:分子鎖両末端トリメチルシロキシ基封鎖メチルハイドロジェンシロキサン・ジメチルシロキサン共重合体、分子内に平均2個、分子鎖側鎖に平均2個(粘度 20mPa・s,Si-H 含有量 0.10質量%)
non-B-2:分子鎖両末端トリメチルシロキシ基封鎖メチルハイドロジェンシロキサン・ジメチルシロキサン共重合体、分子内に平均5個、分子鎖側鎖に平均5個(粘度 5mPa・s,Si-H 含有量 0.75質量%)
C-1:白金濃度が0.6重量%である白金と1,3-ジビニル-1,1,3,3-テトラメチルジシロキサンの錯体
D-1:平均粒子径0.4μmの破砕状酸化アルミニウム粉末
D-2:平均粒子径2.5μmの破砕状酸化アルミニウム粉末
D-3:平均粒子径35μmの球状溶融固化酸化アルミニウム粉末
E-1:デシルトリメトキシシラン
G-1:29H,31H-フタロシアニナト(2-)-N29,N30,N31,N32銅
成分(A-1-1)100質量部、成分(A-2-1)4.3質量部、成分(E-1)12.8質量部、成分(F-1)12.8質量部を計量し、そこに60分かけて成分(D-1)427質量部、成分(D-2)427質量部、成分(D-3)1154質量部を順次混合した。均一にしたのち、減圧下で160℃で90分加熱混合後、室温まで冷却して混合物を得た。
この混合物に、成分(C-1)0.486質量部を混合し、熱伝導性シリコーン組成物の(I)液を得た。
次に成分(F-1)100質量部、成分(E-1)4.9質量部、成分(G-1)2.96質量部を計量し、そこに60分かけて成分(D-1)493質量部、成分(D-2)493質量部、成分(D-3)1330質量部を順次混合した。均一にしたのち、減圧下で160℃で90分加熱混合後、室温まで冷却して混合物を得た。
この混合物に、成分(B-1)29.8質量部、成分(Non-B-2)0.74質量部、成分(Non-A-1-2)4.9質量部とマスターバッチ化した反応抑制剤としてフェニルブチノール 0.025質量部を均一混合し、熱伝導性シリコーン組成物の(II)液を得た。
上記熱伝導性シリコーン組成物をエディーワイ株式会社製25ccツインカートリッジに(I)液と(II)液を分けて充填した。先端にスタティックミキサーMA6.3-12-Sを取り付け、ハンドガンで押し出し混合しながらSHIMAZU社製フローテスターCFT-500EXで粘度と吐出量を測定した。続けて、オイル滲みだし距離、硬化性、硬化後の外観を確認した。
この組成物の粘度[A-1][A-2]/粘度[A-1]は1.23(混合粘度75mPa・s)であった。
実施例1の成分(A-2-1)4.3質量部を成分(A-2-2)4.3質量部に置き換えた以外は、実施例1と同様に熱伝導性シリコーン組成物の(I)液、(II)液を得た。
上記熱伝導性シリコーン組成物をエディーワイ株式会社製25ccツインカートリッジに(I)液と(II)液を分けて充填した。先端にスタティックミキサーMA6.3-12-Sを取り付け、ハンドガンで押し出し混合しながらSHIMAZU社製フローテスターCFT-500EXで粘度と吐出量を測定した。続けて、オイル滲みだし距離、硬化性、硬化後の外観を確認した。
この組成物の粘度[A-1][A-2]/粘度[A-1]は1.31(混合粘度80mPa・s)であった。
実施例1の成分(A-2-1)4.3質量部を成分(A-2-2)8.5質量部に置き換えた以外は、実施例1と同様に熱伝導性シリコーン組成物の(I)液、(II)液を得た。
上記熱伝導性シリコーン組成物をエディーワイ株式会社製25ccツインカートリッジに(I)液と(II)液を分けて充填した。先端にスタティックミキサーMA6.3-12-Sを取り付け、ハンドガンで押し出し混合しながらSHIMAZU社製フローテスターCFT-500EXで粘度と吐出量を測定した。続けて、オイル滲みだし距離、硬化性、硬化後の外観を確認した。
この組成物の粘度[A-1][A-2]/粘度[A-1]は1.67(混合粘度100mPa・s)であった。
実施例1の成分(A-2-1)4.3質量部を成分(A-2-3)1.5質量部に置き換き換えた以外は、実施例1と同様に熱伝導性シリコーン組成物の(I)液、(II)液を得た。
上記熱伝導性シリコーン組成物をエディーワイ株式会社製25ccツインカートリッジに(I)液と(II)液を分けて充填した。先端にスタティックミキサーMA6.3-12-Sを取り付け、ハンドガンで押し出し混合しながらSHIMAZU社製フローテスターCFT-500EXで粘度と吐出量を測定した。続けて、オイル滲みだし距離、硬化性、硬化後の外観を確認した。
この組成物の粘度[A-1][A-2]/粘度[A-1]は1.98(混合粘度119mPa・s)であった。
実施例1の成分(A-2-1)4.3質量部を成分(A-2-3)4.0質量部に置き換き換えた以外は、実施例1と同様に熱伝導性シリコーン組成物の(I)液、(II)液を得た。
上記熱伝導性シリコーン組成物をエディーワイ株式会社製25ccツインカートリッジに(I)液と(II)液を分けて充填した。先端にスタティックミキサーMA6.3-12-Sを取り付け、ハンドガンで押し出し混合しながらSHIMAZU社製フローテスターCFT-500EXで粘度と吐出量を測定した。続けて、オイル滲みだし距離、硬化性、硬化後の外観を確認した。
この組成物の粘度[A-1][A-2]/粘度[A-1]は5.17(混合粘度310mPa・s)であった。
実施例1から成分(A-2-1)4.3質量部を除いた以外は、実施例1と同様に熱伝導性シリコーン組成物の(I)液、(II)液を得た。
上記熱伝導性シリコーン組成物をエディーワイ株式会社製25ccツインカートリッジに(I)液と(II)液を分けて充填した。先端にスタティックミキサーMA6.3-12-Sを取り付け、ハンドガンで押し出し混合しながらSHIMAZU社製フローテスターCFT-500EXで粘度と吐出量を測定した。続けて、オイル滲みだし距離、硬化性、硬化後の外観を確認した。
この組成物は成分(A-2)を含有しておらず、粘度[A-1][A-2]/粘度[A-1]は1.00(混合粘度60mPa・s)であった。
比較例1の成分(A-1-1)100質量部を成分(non-A-1-2)100質量部に置き換えた以外は、比較例1と同様に熱伝導性シリコーン組成物の(I)液、(II)液を得た。
上記熱伝導性シリコーン組成物をエディーワイ株式会社製25ccツインカートリッジに(I)液と(II)液を分けて充填した。先端にスタティックミキサーMA6.3-12-Sを取り付け、ハンドガンで押し出し混合しながらSHIMAZU社製フローテスターCFT-500EXで粘度と吐出量を測定した。続けて、オイル滲みだし距離、硬化性、硬化後の外観を確認した。
この組成物は成分(A-1)、成分(A-2)共に含有していない。
比較例1の成分(A-1-1)100質量部を成分(A-1-1)68質量部と成分(non-A-1-2)32質量部に置き換えた以外は、比較例1と同様に熱伝導性シリコーン組成物の(I)液、(II)液を得た。
上記熱伝導性シリコーン組成物をエディーワイ株式会社製25ccツインカートリッジに(I)液と(II)液を分けて充填した。先端にスタティックミキサーMA6.3-12-Sを取り付け、ハンドガンで押し出し混合しながらSHIMAZU社製フローテスターCFT-500EXで粘度と吐出量を測定した。続けて、オイル滲みだし距離、硬化性、硬化後の外観を確認した。
この組成物は成分(A-2)を含有しておらず、粘度[A-1][A-2]/粘度[A-1]は1.00(混合粘度110mPa・s)であった。
実施例2の成分(A-2-2)4.3質量部を1.0質量部に置き換えた以外は、実施例2と同様に熱伝導性シリコーン組成物の(I)液、(II)液を得た。
上記熱伝導性シリコーン組成物をエディーワイ株式会社製25ccツインカートリッジに(I)液と(II)液を分けて充填した。先端にスタティックミキサーMA6.3-12-Sを取り付け、ハンドガンで押し出し混合しながらSHIMAZU社製フローテスターCFT-500EXで粘度と吐出量を測定した。続けて、オイル滲みだし距離、硬化性、硬化後の外観を確認した。
この組成物の粘度[A-1][A-2]/粘度[A-1]は1.07(混合粘度65mPa・s)であった。
実施例2の成分(A-2-2)4.3質量部を2.0質量部に置き換えた以外は、実施例2と同様に熱伝導性シリコーン組成物の(I)液、(II)液を得た。
上記熱伝導性シリコーン組成物をエディーワイ株式会社製25ccツインカートリッジに(I)液と(II)液を分けて充填した。先端にスタティックミキサーMA6.3-12-Sを取り付け、ハンドガンで押し出し混合しながらSHIMAZU社製フローテスターCFT-500EXで粘度と吐出量を測定した。続けて、オイル滲みだし距離、硬化性、硬化後の外観を確認した。
この組成物の粘度[A-1][A-2]/粘度[A-1]は1.14(混合粘度70mPa・s)であった。
実施例1の成分(A-2-1)4.3質量部を成分(non-A-1-2)4.3質量部に置き換えた以外は、実施例1と同様に熱伝導性シリコーン組成物の(I)液、(II)液を得た。
上記熱伝導性シリコーン組成物をエディーワイ株式会社製25ccツインカートリッジに(I)液と(II)液を分けて充填した。先端にスタティックミキサーMA6.3-12-Sを取り付け、ハンドガンで押し出し混合しながらSHIMAZU社製フローテスターCFT-500EXで粘度と吐出量を測定した。続けて、オイル滲みだし距離、硬化性、硬化後の外観を確認した。
この組成物は成分(A-2)を含有しておらず、粘度[A-1][A-2]/粘度[A-1]は1.00(混合粘度65mPa・s)であった。
実施例1~5に示すとおり、粘度[A-1][A-2]/粘度[A-1]が1.15~5.50の範囲である場合、本発明にかかる各熱伝導性シリコーンゲル組成物(熱伝導率の設計値:5.0W/mK)は、(I)液、(II)液が共に硬化前においてオイルの滲みだしが少なく、かつスタティックミキサーでの混合において良好かつ実用上十分な混合性、かつ安定した硬化性を示していた。特に、実施例1~4に示す、粘度[A-1][A-2]/粘度[A-1]が1.20~2.00の範囲であり、かつ、両者の混合粘度が150mPa・s以下である熱伝導性シリコーンゲル組成物は、上記の特性に加えて、その吐出性にも極めて優れ、取扱作業性および安定性に優れることが確認できた。
Claims (15)
- (A)以下の成分(A-1)および成分(A-2)からなるアルケニル基含有オルガノポリシロキサン
(A-1)シロキサン重合度が5~100の範囲であるアルケニル基含有オルガノポリシロキサン、
(A-2)シロキサン重合度が400以上であるアルケニル基含有オルガノポリシロキサン、
(B)オルガノハイドロジェンポリシロキサン:成分(A)に含まれるアルケニル基1モルに対して、成分(B)中のケイ素原子結合水素原子が0.2~5モルとなる量、
(C)触媒量のヒドロシリル化反応用触媒、
(D)熱伝導性充填剤、
(E)1種類以上のシランカップリング剤またはその加水分解縮合物、および
(F)分子鎖末端に加水分解性シリル基を有するオルガノポリシロキサン
を含有する(I)液および(II)液からなり、
(I)液中における成分(D)の含有量が成分(A-1)100質量部に対して、600~3,500質量部の範囲であり、
(II)液中における成分(D)の含有量が成分(A-1)100質量部に対して、600~3,500質量部の範囲であり、かつ、
成分(A-1)と成分(A-2)が同一系内に存在し、これら混合ポリマーの25℃における粘度が、成分(A-1)の25℃における粘度の1.15~5.5倍の範囲内である、多成分型熱伝導性シリコーンゲル組成物。 - 上記の成分(A-1)の25℃における粘度が10~100mPa・sの範囲であり、
上記の成分(A-2)の25℃における粘度が10,000mPa・s以上であり、かつ、
成分(A-1)と成分(A-2)が同一系内に存在し、これら混合ポリマーの25℃における粘度が成分(A-1)の1.2~2.0倍の範囲内である、請求項1に記載の多成分型熱伝導性シリコーンゲル組成物。 - 熱伝導率が2.0W/mK以上であることを特徴とする、請求項1または請求項2に記載の多成分型熱伝導性シリコーンゲル組成物。
- 成分(E)が、(E1)分子内に炭素原子数6以上のアルキル基を有するアルコキシシランを含有してなり、前記の成分(D)が、成分(E)および成分(F)により表面処理されていることを特徴とする、請求項1~請求項3のいずれか1項に記載の多成分型熱伝導性シリコーンゲル組成物。
- 成分(F)が、下記一般式(1)または一般式(2)で表されるオルガノポリシロキサン、またはそれらの混合物である、請求項1~請求項4のいずれか1項に記載の多成分型熱伝導性シリコーンゲル組成物。
(i) 一般式(1):
(式中、R1は独立に非置換または置換の一価炭化水素基であり、R2は独立に水素原子、アルキル基、アルコキシアルキル基、またはアシル基であり、aは5~250の整数であり、bは1~3の整数である。)で表され、25℃における粘度が10~10,000mPa・s未満であるオルガノポリシロキサン
(ii) 一般式(2):R4 3SiO(R4 2SiO)pR4 2Si-R5-SiR4 (3-d)(OR3)d (2)
(式中、R4は同種もしくは異種の一価炭化水素基であり、R5は酸素原子または二価炭化水素基であり、R3は前記と同様の基であり、pは100~500の整数であり、dは前記と同様の整数である。)で表されるオルガノポリシロキサン - 上記の(I)液および(II)液中の成分(D)の含有量が、各々の組成物全体の80~98質量%の範囲であり、成分(D)以外の充填剤を実質的に含まないことを特徴とする、請求項1~請求項5のいずれか1項に記載の多成分型熱伝導性シリコーンゲル組成物。
- 前記の成分(B)が、(B1)25℃における粘度が1~1,000mPa・sであり、分子内に平均して2~4個のケイ素原子結合水素原子を含有し、そのうち、少なくとも2個を分子鎖側鎖に有する直鎖状のオルガノハイドロジェンポリシロキサンを含有してなり、組成物中の成分(B1)中のケイ素原子結合水素原子([HB1])と、成分(B1)以外のオルガノハイドロジェンポリシロキサン中のケイ素原子結合水素原子の含有量([Hnon-B1])について、[Hnon-B1]/ ([HB1]+[Hnon-B1])の値が0.0~0.70の範囲となる関係が成立することを特徴とする、請求項1~請求項6のいずれか1項に記載の多成分型熱伝導性シリコーンゲル組成物。
- さらに、(G)耐熱性付与剤を含有してなる、請求項1~請求項7のいずれか1項に記載の多成分型熱伝導性シリコーンゲル組成物。
- 前記の成分(D)が、(D1)平均粒径が0.1~150μmである板状の窒化ホウ素粉末、(D2)平均粒径が0.1~500μmである顆粒状若しくは球状に成形された窒化ホウ素粉末、(D3)平均粒径が0.01~50μmである球状溶融固化及び/若しくは破砕状の酸化アルミニウム粉末、又は(D4)平均粒径が0.01~50μmであるグラファイト、或いはこれらの2種類以上の混合物である、請求項1~請求項8のいずれか1項に記載の多成分型熱伝導性シリコーンゲル組成物。
- 上記の(I)液および(II)液からなる2成分型熱伝導性シリコーンゲル組成物である、請求項1~請求項9のいずれか1項に記載の多成分型熱伝導性シリコーンゲル組成物。
- 請求項1~請求項10のいずれか1項に記載の多成分型熱伝導性シリコーンゲル組成物またはその硬化物からなる熱伝導性部材。
- 請求項11に記載の熱伝導性部材を備えた放熱構造体。
- 放熱部品または該放熱部品を搭載した回路基板に、請求項1~請求項10のいずれか1項に記載の多成分型熱伝導性シリコーンゲル組成物またはその硬化物を介して放熱部材を設けてなる放熱構造体。
- 電気・電子機器である、請求項12または請求項13に記載の放熱構造体。
- 電気・電子部品または二次電池である、請求項12または請求項13に記載の放熱構造体。
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US20220169799A1 (en) | 2022-06-02 |
JPWO2020203299A1 (ja) | 2020-10-08 |
CN113519051A (zh) | 2021-10-19 |
JP7422742B2 (ja) | 2024-01-26 |
EP3951862A1 (en) | 2022-02-09 |
TW202100663A (zh) | 2021-01-01 |
EP3951862A4 (en) | 2022-12-28 |
US12037460B2 (en) | 2024-07-16 |
KR20210148204A (ko) | 2021-12-07 |
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