WO2021260279A1 - Compositions silicones thermoconductrices - Google Patents
Compositions silicones thermoconductrices Download PDFInfo
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- WO2021260279A1 WO2021260279A1 PCT/FR2021/000066 FR2021000066W WO2021260279A1 WO 2021260279 A1 WO2021260279 A1 WO 2021260279A1 FR 2021000066 W FR2021000066 W FR 2021000066W WO 2021260279 A1 WO2021260279 A1 WO 2021260279A1
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- thermally conductive
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- organopolysiloxane
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- 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
- C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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- C—CHEMISTRY; METALLURGY
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- 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
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08K3/02—Elements
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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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
- 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
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/04—Compounds of zinc
- C09C1/043—Zinc oxide
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/28—Compounds of silicon
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/40—Compounds of aluminium
- C09C1/407—Aluminium oxides or hydroxides
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/12—Treatment with organosilicon compounds
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/51—Particles with a specific particle size distribution
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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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
- C08J2383/07—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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K2003/023—Silicon
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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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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- 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
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to novel organopolysiloxane compositions crosslinking by polyaddition, intended to produce thermally conductive elements in particular for the automotive field, in particular for the field of electric vehicles.
- Thermally conductive silicone elastomers are well known for their remarkable properties of heat transfer, thermal resistance to hot and cold, and electrical insulation. They are used in particular in electrical and electronic applications, and in the automotive industry. In particular in the automotive field, thermally conductive silicone elastomers are used in the batteries of electric vehicles and hybrid vehicles (“EV” and “HEV” according to English terminology) to remove heat from the cells of battery packs and of on-board electronics.
- EV electric vehicles and hybrid vehicles
- Thermally conductive silicone formulations have been described in the prior art. As early as 1981, US Pat. No. 4,292,223 described thermally conductive elastomers comprising organopolysiloxanes, a particulate filler and a viscosity modifier.
- the particulate filler comprises silica and a thermally conductive metal powder.
- the content by weight of metal powder is however only from 0.5: 1 to 2.5: 1, in powder / polymer mass ratio, and the maximum thermal conductivity obtained is only 11.7.10 4 cal / s. .cm. ° C, or 0.5 W / mK, which is not sufficient for the desired applications.
- metal oxide powders have been employed to improve the thermal conductivity of elastomers, for example aluminum trihydrate (ATH), aluminum oxide and / or magnesium oxide (see for example the application US Patent 2019/0161666).
- elastomers for example aluminum trihydrate (ATH), aluminum oxide and / or magnesium oxide.
- ATH aluminum trihydrate
- aluminum oxide aluminum oxide
- magnesium oxide see for example the application US Patent 2019/0161666
- thermally conductive fillers at very high concentration is responsible for increasing the density of the elastomer.
- the density of the elastomeric material is a very important property.
- thermally conductive elastomer material the density of which is preferably less than 4 g / cm 3 , more preferably less than 3 g / cm 3 , more preferably less than 2.5 g / cm 3 , and even more preferably less than 2 g / cm 3 .
- Patent application JP 2000-063670 describes a thermally conductive silicone elastomer containing metallic silicon as thermally conductive filler.
- Patent EP 1,788,031 also describes the use of metallic silicon powder in silicone elastomers as a thermally conductive filler in order to obtain high thermal conductivity and good storage stability.
- the maximum thermal conductivity obtained in this document is between 0.6 W / mK and 1.0 W / mK
- the patent application JP 2007-311628 describes a thermally conductive elastomer film in which a silicon powder metallic is used as a thermally conductive filler and electrical insulator.
- said metallic silicon powder has a particle size of less than 20 ⁇ m.
- Patent application KR 20120086249 describes a method of preparing a thermally conductive silicone elastomer containing a thermally conductive powder filler and a hollow filler made of organic resin. According to this document, use will preferably be made of a thermally conductive powder having particles with a diameter of between 3 and 15 ⁇ m. It is specified that the silicone elastomer obtained can have a thermoconductivity of between 0.15 W / mK and 3.0 W / m. K. However, in the examples, the thermal conductivity does not exceed 0.41 W / mK
- patent JP524573 describes thermally conductive heat-sealing rolls and bands using a silicone elastomer layer comprising a metallic silicon powder.
- the thermal conductivity obtained is 2 W / m.K.
- thermally conductive silicone elastomer having both a high thermal conductivity, preferably greater than 2.0 W / mK or 3.0 W / mK, and a low density, preferably less than 3 g /. cm 3 or 2 g / cm 3 .
- this silicone elastomer it is necessary for this silicone elastomer to have a consistency allowing its implementation and its use in the desired technical fields. Indeed, the inventors have observed that the composition could become powdery if the fillers were poorly chosen, and the preparation of the elastomer then became impossible.
- the object of the present invention is to provide a novel thermally conductive organopolysiloxane composition, solving the above-mentioned problems, and having both high thermal conductivity, low density, and good processability.
- the present invention relates to an organopolysiloxane composition X comprising:
- organopolysiloxane A having, per molecule, at least two C2-C6 alkenyl groups bonded to silicon
- organopolysiloxane B having, per molecule, at least two SiH units
- thermally conductive filler D comprises at least 40% by weight of metallic silicon, said thermally conductive filler D comprises between 3% and 22% of particles having a diameter less than or equal to 2 ⁇ m, and the particle size distribution is such that the d90 / d10 ratio of said filler is greater than or equal to 20.
- Another subject of the present invention relates to a two-component system P precursor of the organopoly siloxane composition X as defined above and comprising the constituents A, B, C, and D as defined above, said two-component system.
- component P being characterized in that it is presented in two distinct parts PI and P2 intended to be mixed to form said organopolysiloxane composition X, and in that one of the parts PI or P2 comprises catalyst C and does not include l organopolysiloxane B, while the other part PI or P2 comprises organopolysiloxane B and does not include catalyst C.
- Another subject of the present invention relates to a silicone elastomer capable of being obtained by crosslinking and / or curing of the organopolysiloxane composition X as defined above, as well as the use of the silicone elastomer as a thermally conductive coating material. or filling, in particular for the automotive field, in particular for the field of electric vehicles.
- At least one organopolysiloxane A having, per molecule, at least two C2-C6 alkenyl groups bonded to silicon
- thermally conductive filler D comprises at least 40% by weight of metallic silicon, said thermally conductive filler D comprises between 3% and 22% of particles having a diameter less than or equal to 2 mhi, and the size distribution of the particles is such that the d90 / d10 ratio of said filler is greater than or equal to 20.
- organopolysiloxane composition X comprising at least the following components A, B, C, and D:
- organopolysiloxane A having, per molecule, at least two C 1 -G alkenyl groups, bonded to silicon
- organopolysiloxane B having, per molecule, at least two SiH units
- the organopolysiloxane A having, per molecule, at least two C2-C6 alkenyl groups bonded to silicon, can in particular be formed:
- R 1 c SiO ( 4- C ) / 2 in which R 1 has the same meaning as above and c 0, 1, 2 or 3.
- terminal "M” units mention may be made of trimethylsiloxy, dimethylphenylsiloxy, dimethylvinylsiloxy or dimethylhexenylsiloxy groups.
- organopolysiloxane A contains terminal dimethylvinylsilyl units and even more preferably organopolysiloxane A is a poly (dimethylsiloxane) with dimethylvinylsilyl ends.
- Silicone oil generally has a viscosity of between 1 mPa.s and 2,000,000 mPa.s.
- said organopolysiloxanes A are oils with a dynamic viscosity of between 20 mPa.s and 100,000 mPa.s, preferably between 20 mPa.s and 80,000 mPa.s at 25 ° C, and more preferably between 100 mPa.s and 50,000 mPa.s.
- the organopolysiloxanes A can also contain “T” siloxyl units (R'SiCLi) and / or “Q” siloxyl units (S1O4 / 2).
- the R 1 symbols are as described above.
- the organopolysiloxanes A then exhibit a branched structure. Examples of branched organopolysiloxanes which may be organopolysiloxanes A according to the invention are:
- the organopolysiloxane composition X does not comprise branched organopolysiloxanes or resins comprising C2-C6 alkenyl units.
- the organopolysiloxane compound A has a content by mass of alkenyl unit of between 0.001% and 30%, preferably between 0.01% and 10%, preferably between 0.02 and 5%.
- the organopolysiloxane composition X preferably comprises from 5% to 30% of organopolysiloxane A, more preferably from 8% to 15% by weight of organopolysiloxane A, relative to the total weight of the organopolysiloxane composition X.
- the organopolysiloxane composition X can comprise a single organopolysiloxane A or a mixture of several organopolysiloxanes A having, for example, different viscosities and / or different structures.
- Organopolysiloxane B is an organohydrogenpolysiloxane compound comprising per molecule at least two, and preferably at least three, hydrogenosilyl functions or Si — H units.
- the organopolysiloxane composition X can comprise a single organohydrogenpolysiloxane B or a mixture of several organohydrogenpolysiloxanes B having, for example, different viscosities and / or different structures.
- the organohydrogenpolysiloxane B can advantageously be an organopolysiloxane comprising at least two, preferably at least three, siloxyl units of the following formula: in which :
- R 2 radicals which are identical or different, represent a monovalent radical having 1 to 12 carbon atoms
- R 2 f SiO ( 4-f> / 2 in which R 2 has the same meaning as above, and f 0, 1, 2, or 3.
- R 2 can represent a monovalent radical chosen from the group consisting of alkyl groups having 1 to 8 carbon atoms, optionally substituted by at least one halogen atom such as chlorine or fluorine, cycloalkyl groups having from 3 to 8 carbon atoms and aryl groups having 6 to 12 carbon atoms.
- R 2 can advantageously be chosen from the group consisting of methyl, ethyl, propyl, 3,3,3-trifluoropropyl, xylyl, tolyl and phenyl.
- the organohydrogenpolysiloxane B can have a linear, branched or cyclic structure.
- the degree of polymerization is preferably greater than or equal to 2. Generally, it is less than 5000.
- linear polymers they consist essentially of siloxyl units chosen from the units of the following formulas D: R 2 2 Si0 2/2 or D ': R 2 HSi0 2/2 , and of siloxyl units terminals chosen from the units of the following formulas M: R 2 3SiOi / 2 or M ': R 2 2HSiOi / 2 where R 2 has the same meaning as above.
- organohydrogenpolysiloxanes which may be organopolysiloxanes B according to the invention comprising at least two hydrogen atoms bonded to a silicon atom are:
- organohydrogenpolysiloxane B has a branched structure
- it is preferably chosen from the group consisting of the silicone resins of the following formulas:
- T siloxyl unit of formula R 2 3 SiOi / 2
- Q siloxyl unit of formula S1O4 / 2 where R 2 has the same meaning as above.
- the organohydrogenpolysiloxane compound B has a mass content of hydrogenosilyl Si — H functions of between 0.2% and 91%, more preferably between 3% and 80%, and even more preferably between 15% and 70%.
- the molar ratio of the hydrogenosilyl Si-H functions to the alkenes functions can advantageously be between 0.2 and 20, preferably between 0.5 and 15, more preferably between 0.5 and 10, and even more preferably between 0.5 and 5.
- the viscosity of the organohydrogenpolysiloxane B is between 1 mPa.s and 5000 mPa.s, more preferably between 1 mPa.s and 2000 mPa.s and even more preferably between 5 mPa.s and 1000 mPa.s.
- the organopolysiloxane composition X preferably comprises from 0.1% to 10% of organohydrogenopolysiloxane B, and more preferably from 0.5% to 5% by weight, relative to the total weight of the organopolysiloxane composition X.
- the hydrosilylation catalyst C can in particular be chosen from platinum and rhodium compounds but also from silicon compounds such as those described in patent applications WO 2015/004396 and WO 2015/004397, germanium compounds such as those described. in patent applications WO 2016/075414 or complexes of nickel, cobalt or iron such as those described in patent applications WO 2016/071651, WO 2016/071652 and WO 2016/071654.
- Catalyst C is preferably a compound derived from at least one metal belonging to the platinum group. These catalysts are well known.
- catalyst C is a compound derived from platinum.
- the quantity by weight of catalyst C, calculated by weight of platinum metal is generally between 2 ppm and 400 ppm by weight, preferably between 5 ppm and 200 ppm by weight, based on the total weight of composition X.
- catalyst C is a Karstedt platinum.
- the organopolysiloxane composition X according to the present invention is characterized in that it comprises a thermally conductive filler D.
- a thermally conductive filler D This can consist of a single filler or of a mixture of fillers having a different chemical nature and / or a structure different and / or different grain size.
- the thermally conductive filler D consists of a mixture of at least two fillers or at least three fillers having a different chemical nature and / or particle size.
- the thermally conductive filler D consists of a single filler.
- the total weight of the thermally conductive filler D in the organopolysiloxane composition X is preferably greater than 70%, more preferably greater than 75%, and even more preferably between 80% and 95%, by weight relative to the weight total composition organopolysiloxane X. According to a particularly advantageous embodiment of the present invention, the total weight of the thermally conductive filler D in the organopolysiloxane composition X is greater than or equal to 85%. This particularly high content of thermally conductive filler makes it possible to achieve very high thermal conductivities.
- Said thermally conductive filler D comprises at least 40% by weight of metallic silicon, preferably at least 50% by weight, more preferably at least 60% by weight, more preferably at least 70% by weight, and most preferably at least 60% by weight. even more preferred at least 80% by weight.
- the thermally conductive filler D comprises between 60% and 99.99% by weight of metallic silicon, preferably between 65% and 99.95% by weight, more preferably between 70% and 99, 9% by weight, more preferably between 70% and 99% by weight, more preferably between 75% and 97% by weight, more preferably between 80% and 95% by weight.
- the thermally conductive filler D may contain one or more other fillers of a different nature known to those skilled in the art for their thermally conductive properties, in particular from metals, alloys, metal oxides, metal hydroxides, metal nitrides. , metallic carbides, metallic silicides, carbon, soft magnetic alloys and ferrites.
- the thermally conductive filler D may comprise, in addition to metallic silicon, a thermally conductive filler chosen from the group consisting of an alumina filler, an aluminum trihydrate (ATH) filler, an aluminum filler, a filler. silica, zinc oxide filler, aluminum nitride filler, boron nitride filler, and mixtures thereof.
- the thermally conductive filler D can comprise, in addition to metallic silicon, in addition to metallic silicon, a thermally conductive filler chosen from the group consisting of an alumina filler, an aluminum trihydrate (ATH) filler. , a zinc oxide filler, a silica filler, and mixtures thereof.
- the thermally conductive filler D can comprise between 0.01% and 60% by weight of thermally conductive filler which is not metallic silicon, preferably between 0.05% and 50% by weight, more preferably between 0, 1% and 40% by weight, more preferably between 1% and 30% by weight, more preferably between 3% and 25% by weight, more preferably between 5% and 20% by weight.
- the organopolysiloxane composition X does not contain aluminum trihydrate (ATH), and / or
- the thermally conductive filler D according to the invention has certain particle size characteristics.
- R 1 is a linear or branched alkyl radical, or a phenyl radical
- R 2 is a hydrogen atom, a linear or branched alkyl radical, or a phenyl radical,
- Said alcohols are preferably chosen from those having a boiling point greater than 250 ° C. Mention may be made, by way of examples, of the following products which are commercially available: 1-ethynyl-l-cyclohexanol, methyl-3-dodécyne-l-ol-3, trimethyl-3,7,1 l-dodécyne -1-ol-3, diphenyl-1, 1-propyne-2-ol-1, ethyl-3-ethyl-6-nonyne-1-ol-3 and methyl-3-pentadecyne-1-ol-3.
- the crosslinking inhibitor F is 1-ethynyl-1-cyclohexanol.
- the organopolysiloxane composition X according to the invention comprises:
- organopolysiloxane A having, per molecule, at least two C2-C6 alkenyl groups bonded to silicon
- organopolysiloxane B having, per molecule, at least two SiH units
- a subject of the present invention is also the silicone elastomer obtained or capable of being obtained by crosslinking and / or curing of the organopolysiloxane composition X such as defined above, the process for obtaining said elastomer, as well as the intermediate compositions used during this process for obtaining.
- the present invention also relates to a two-component system P precursor of the organopolysiloxane composition X as defined above, comprising at least the components A, B, C, and D, said two-component system P being characterized in that it is in two distinct PI and P2 parts intended to be mixed to form said organopolysiloxane composition X, and in that one of the PI or P2 parts comprises catalyst C and does not include organopolysiloxane B , while the other PI or P2 part comprises the organopolysiloxane B and does not include the catalyst C.
- Another object of the present invention consists of a process for preparing a silicone elastomer comprising the following steps: a) providing a two-component system P comprising all the components of the organopolysiloxane composition X as defined above; b) mixing the two parts of said two-component system P to obtain the organopolysiloxane composition X; and c) allowing said organopolysiloxane composition X to crosslink and / or harden to obtain said silicone elastomer.
- organopolysiloxane A having, per molecule, at least two C2-C6 alkenyl groups bonded to silicon
- part P2 optionally the treatment agent for the thermally conductive load E, and part P2 includes:
- organopolysiloxane A having, per molecule, at least two C2-C6 alkenyl groups bonded to silicon
- the thermally conductive filler D can be present in part PI, in part P2 or in both parts PI and P2, with identical or different contents between parts PI and P2.
- the thermally conductive filler D can be present in part PI and in part P2, in an identical content.
- the total content of thermally conductive filler D remains invariable in the organopolysiloxane composition X regardless of the rate of mixing of the parts PI and P2.
- the PI part, the P2 part or the two PI and P2 parts can be obtained from an intermediate composition comprising all or part of the organopolysiloxane A and all or part of the thermally conductive filler D, as well as optionally the treatment agent for the thermally conductive filler E.
- a subject of the present invention is also an intermediate composition comprising:
- At least one organopolysiloxane A having, per molecule, at least two C2-C6 alkenyl groups bonded to silicon
- the total weight of the thermally conductive filler D in the intermediate composition is greater than 70%, more preferably greater than 75%, and more preferably greater than 80%, and even more preferably between 85% and 98% by weight relative to the total weight of the intermediate composition.
- This intermediate composition particularly rich in thermally conductive filler D, makes it possible, after dilution with other components, to easily obtain the organopolysiloxane composition X or precursor parts PI and / or P2.
- the intermediate composition according to the present invention can be obtained by mixing at least the organopolysiloxane A and the thermally conductive filler D by means of a device known to those skilled in the art, for example a Z-arm mixer or a butterfly mixer. .
- the organopolysiloxane composition X as well as the parts PI and P2 of the two-component system P precursor of the organopolysiloxane composition X, have good processability. Indeed, despite the presence of a very high thermally conductive filler content, said compositions are advantageously pasty and non-powdery, which makes them easy to handle, in particular extrudable. It is to the credit of the inventors to have succeeded in determining the good characteristics of the thermally conductive filler allowing this technical result to be achieved.
- the silicone elastomer which is the subject of the present invention, obtained or capable of being obtained by crosslinking and / or curing of the organopolysiloxane composition X advantageously exhibits a thermal conduction greater than or equal to 1 W / mK, preferably greater than or equal to 1.5 W / mK, more preferably greater than or equal to 2 W / mK, more preferably greater than or equal to 3 W / mK, and even more preferably between 3 W / mK and 7 W / mK
- said silicone elastomer advantageously has a density of less than or equal to 4 g / cm 3 , preferably less than or equal to 3 g / cm 3 , more preferably less than 2 g / cm 3 .
- the silicone elastomer according to the present invention can easily be recycled after use.
- this elastomer preferably contains a very high silicon element content, in particular when the thermally conductive filler itself contains a very high metallic silicon content.
- the used silicone elastomer can advantageously be recycled using combustion furnaces.
- Said silicone elastomer can advantageously be used as a thermally conductive material in various technical fields, in particular in the field of electronics, in electrical applications, and in the automotive field.
- Said silicone elastomer can advantageously be used as a thermally conductive coating material (ie “potting” according to English terminology) or filling (ie “gap-filler” according to English terminology. Anglo-Saxon), in particular for batteries, for example the batteries of electric vehicles and hybrid vehicles, but also stationary batteries.
- the silicone elastomer according to the invention can advantageously be used as a thermally conductive material in 5G devices.
- the particle size distribution of the fillers is measured by a laser diffraction method:
- - "d10" corresponds to the characteristic diameter corresponding to 10% of the cumulative frequency by volume of the particle size distribution of the filler.
- - "d90" corresponds to the characteristic diameter corresponding to 90% of the cumulative frequency by volume of the particle size distribution of the filler.
- - "d100" corresponds to the characteristic diameter corresponding to 100% of the cumulative frequency by volume of the particle size distribution of the filler.
- the content of particles having a diameter less than or equal to 2 ⁇ m is a volume content, obtained by summing the volume of all the particles having a diameter measured by laser diffraction less than or equal to 2 ⁇ m.
- Silicone compositions corresponding to parts PI and P2 were prepared according to the following protocol:
- thermally conductive filler D the silicone oil A and the catalyst C were mixed in a Speed Mixer at 1800 rpm according to the concentration indicated in Table 1 below.
- concentration of thermally conductive fillers is 85%.
- thermally conductive filler D silicone oil A, silicone oils B 1 and B2, and G 1-ethynyl-l-cyclohexanol F were mixed in a Speed Mixer at 1800 rpm depending on the concentration shown in Table 1 below.
- concentration of thermally conductive fillers is 85%.
- Examples 18 to 22 were carried out by mixing with the Speed Mixer (stirring for 2 times 2 minutes at 1800 revolutions per minute) 85% of thermally conductive fillers D with 15% of silicone oil A, by varying the thermally conductive load D as described. in Table 4 below.
- the processability of the compositions obtained was visually evaluated as described above.
- the thermal conductivity and the density of an elastomeric material which could be obtained from the exemplified compositions were estimated by calculation.
- Step 1 Manufacture of an intermediate composition 89% of thermally conductive fillers D, 9% of silicone oil A and 2% of octyltrimethoxysilane
- Step 2 Manufacture of the PI and P2 parts
- For part P2 Dilution of the mash obtained in step 1 with silicone oil A, silicone oils B1 and B2, and G 1-ethynyl-l-cyclohexanol F. according to the concentration indicated in the table 5 below.
- the concentration of thermally conductive fillers is 85%. Said dilutions are obtained by mixing in a Speed Mixer at 1800 revolutions per minute. The PI and P2 parts had very good processability.
- Step 3 Manufacture of the thermally conductive silicone composition and of the thermally conductive silicone elastomer
- step 2 The PI and P2 parts obtained in step 2 were mixed in a ratio of 1: 1 with the Speed Mixer. The resulting mixture was degassed in vacuo, then poured into a mold. The mixture contained in the mold was then placed in a heating press, at a pressure of 2 bars, at 100 ° C., for 30 minutes.
- the thermal conductivity of the elastomer was measured according to the transient plane source method (TPS method for "transient place source”) as described in standard ISO 22007-2 ("Determination of thermal conductivity and effusivity thermal. Part 2: Transient planar source (hot disk) method ”) using a Hot Disc TPS 2200 device.
- TPS method transient plane source method
- the thermal conductivity of the elastomer was equal to 3.42 W / mK
- the density of l elastomer was 1.94 g / cm 3 .
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Abstract
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Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP21740116.5A EP4172276A1 (fr) | 2020-06-25 | 2021-06-24 | Compositions silicones thermoconductrices |
| KR1020237002650A KR20230029862A (ko) | 2020-06-25 | 2021-06-24 | 열 전도성 실리콘 조성물 |
| CN202180055532.3A CN116209720B (zh) | 2020-06-25 | 2021-06-24 | 导热有机硅组合物 |
| JP2022580193A JP7524367B2 (ja) | 2020-06-25 | 2021-06-24 | 熱伝導性シリコーン組成物 |
| US18/003,206 US12466952B2 (en) | 2020-06-25 | 2021-06-24 | Thermally conductive silicone compositions |
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| FR2006652 | 2020-06-25 | ||
| FRFR2006652 | 2020-06-25 |
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| WO2021260279A1 true WO2021260279A1 (fr) | 2021-12-30 |
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| PCT/FR2021/000066 Ceased WO2021260279A1 (fr) | 2020-06-25 | 2021-06-24 | Compositions silicones thermoconductrices |
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| Country | Link |
|---|---|
| US (1) | US12466952B2 (fr) |
| EP (1) | EP4172276A1 (fr) |
| JP (1) | JP7524367B2 (fr) |
| KR (1) | KR20230029862A (fr) |
| CN (1) | CN116209720B (fr) |
| WO (1) | WO2021260279A1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025133479A1 (fr) | 2023-12-22 | 2025-06-26 | Elkem Silicones France Sas | Composition silicone réticulable par polyaddition pour la préparation d'élastomère silicone thermoconducteur |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022161634A1 (fr) * | 2021-01-29 | 2022-08-04 | Wacker Chemie Ag | Pâtes thermoconductrices contenant du silicium |
| WO2025129422A1 (fr) * | 2023-12-19 | 2025-06-26 | Henkel Ag & Co. Kgaa | Compositions d'empotage de silicone thermoconductrices, et articles et ensembles associés |
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- 2021-06-24 JP JP2022580193A patent/JP7524367B2/ja active Active
- 2021-06-24 US US18/003,206 patent/US12466952B2/en active Active
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025133479A1 (fr) | 2023-12-22 | 2025-06-26 | Elkem Silicones France Sas | Composition silicone réticulable par polyaddition pour la préparation d'élastomère silicone thermoconducteur |
| WO2025133480A1 (fr) | 2023-12-22 | 2025-06-26 | Elkem Silicones France Sas | Composition silicone réticulable par polyaddition pour la préparation d'élastomère silicone thermoconducteur |
Also Published As
| Publication number | Publication date |
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| US12466952B2 (en) | 2025-11-11 |
| CN116209720A (zh) | 2023-06-02 |
| JP7524367B2 (ja) | 2024-07-29 |
| JP2023533466A (ja) | 2023-08-03 |
| US20230250283A1 (en) | 2023-08-10 |
| EP4172276A1 (fr) | 2023-05-03 |
| KR20230029862A (ko) | 2023-03-03 |
| CN116209720B (zh) | 2025-06-24 |
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