WO2015056374A1 - シリコーンゲル組成物及びシリコーンゲル硬化物 - Google Patents
シリコーンゲル組成物及びシリコーンゲル硬化物 Download PDFInfo
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/29—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the material, e.g. carbon
- H01L23/293—Organic, e.g. plastic
- H01L23/296—Organo-silicon compounds
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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
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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
- C08G77/20—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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
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- C08K3/00—Use of inorganic substances as compounding ingredients
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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
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- C08K5/56—Organo-metallic compounds, i.e. organic compounds containing a metal-to-carbon bond
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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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention relates to a silicone gel composition and a cured silicone gel obtained by curing the composition.
- the silicone gel composition contains an organohydrogenpolysiloxane having a hydrogen atom (ie, SiH group) bonded to a silicon atom, an organopolysiloxane having an alkenyl group such as a vinyl group bonded to a silicon atom, and a platinum-based catalyst. And an addition reaction curable organopolysiloxane composition obtained by adding a hydrogen atom bonded to a silicon atom to an alkenyl group to obtain a cured product.
- the silicone gel cured product cured by heating this silicone gel composition is excellent in heat resistance, weather resistance, oil resistance, cold resistance, electrical insulation, etc. It is used to protect electronic parts such as parts and consumer electronic parts.
- the silicone gel cured product having a low elastic modulus and low stress is a feature not found in other elastomer products.
- demands for heat resistance of cured silicone gels used for sealing have increased due to demands for higher reliability of in-vehicle electronic parts and consumer electronic parts.
- the hydroxyl group in the composition is 150 ppm or less (see Patent Document 1).
- a composition containing an alkoxysilane compound and an organic titanate in a specific organopolysiloxane is disclosed (see Patent Document 2).
- a composition containing a reaction product obtained by high-temperature heat treatment of a specific metal carboxylate and an organopolysiloxane is disclosed.
- the present invention has been made in view of the above circumstances, and provides a silicone gel composition that becomes a cured silicone gel having a low elastic modulus and low stress when cured and having excellent heat resistance at 230 ° C. Objective.
- Such a silicone gel composition has a low elastic modulus and low stress when cured, and becomes a cured silicone gel excellent in heat resistance at 230 ° C.
- the penetration (measure of softness) defined by JIS K 2220 (1/4 cone) when the silicone gel composition is cured is 10 to 200.
- Such a silicone gel composition will surely become a cured silicone gel having a low elastic modulus and low stress when cured.
- cured material formed by hardening
- a silicone gel cured product having a change rate of -70% or more is provided.
- the rate of change is ⁇ 70% or more means that the rate of change of the penetration does not become more negative than ⁇ 70% (that is, an increase in the hardness of the silicone gel after heating is suppressed). Mean).
- the elastic modulus and stress of the cured silicone gel can be kept low even when left for a long time at 230 ° C. after curing.
- the silicone gel composition of the present invention includes a carbon nanotube that has a low elastic modulus and low stress when cured, and imparts excellent heat resistance to the cured product, so that it can be obtained at 230 ° C. It becomes a silicone gel cured product having excellent heat resistance. Furthermore, the elastic modulus and stress of the cured silicone gel can be kept low even if the silicone gel is left for a long time at 230 ° C. after curing. Therefore, the silicone gel composition of the present invention can be suitably used for protecting electronic parts such as in-vehicle electronic parts and consumer electronic parts.
- the inventors of the present invention have a low elastic modulus and low stress when cured because the addition reaction curable organopolysiloxane composition contains carbon nanotubes. It discovered that it became a silicone gel hardened
- the present invention (A) Organopolysiloxane represented by the following general formula (1) having at least one alkenyl group bonded to a silicon atom in one molecule: 100 parts by mass R a R 1 b SiO (4-ab) / 2 (1) Wherein R is independently an alkenyl group, R 1 is independently a substituted or unsubstituted monovalent hydrocarbon group not containing an aliphatic unsaturated bond, and a is a positive number of 0.0001 to 0.2. (B is a positive number from 1.7 to 2.2, and a + b is from 1.9 to 2.4).
- R is independently an alkenyl group
- R 1 is independently a substituted or unsubstituted monovalent hydrocarbon group not containing an aliphatic unsaturated bond
- a is a positive number of 0.0001 to 0.2.
- B is a positive number from 1.7 to 2.2, and a + b is from 1.9 to 2.4).
- the silicone gel composition of the present invention comprises the above components (A) to (D) as essential components.
- cured material is a hardened
- a cured product has, for example, a penetration of 10 to 200 according to JIS K 2220 (1/4 cone). Further, this corresponds to a rubber hardness measurement according to JIS K 6301 having a measured value (rubber hardness value) of 0, which is so low that it does not show an effective rubber hardness value (ie, soft). In this respect, it is different from a so-called cured silicone rubber (rubber-like elastic body).
- a viscosity is a value in 25 degreeC.
- the component (A) of the silicone gel composition of the present invention is the main component (base polymer) of the silicone gel composition.
- This component (A) is an alkenyl group bonded to a silicon atom in one molecule represented by the following general formula (ie, average composition formula) (1) (referred to as “silicon atom-bonded alkenyl group” in the present specification). ) Is one or more organopolysiloxanes.
- R a R 1 b SiO (4-ab) / 2 (1)
- R is independently an alkenyl group
- R 1 is independently a substituted or unsubstituted monovalent hydrocarbon group not containing an aliphatic unsaturated bond
- a is a positive number of 0.0001 to 0.2.
- B is a positive number from 1.7 to 2.2, and a + b is from 1.9 to 2.4).
- R is independently an alkenyl group, and the number of carbon atoms is usually 2 to 6, preferably 2 to 4, and more preferably 2 to 3. Specific examples thereof include a vinyl group, an allyl group, a propenyl group, an isopropenyl group, a butenyl group, an isobutenyl group, and the like. Preferred R is a vinyl group.
- R 1 independently represents a substituted or unsubstituted monovalent hydrocarbon group that does not contain an aliphatic unsaturated bond, and the number of carbon atoms is usually 1 to 10, preferably 1. ⁇ 6. Specific examples thereof include methyl groups, ethyl groups, propyl groups, isopropyl groups, butyl groups, isobutyl groups, tert-butyl groups, pentyl groups, hexyl groups, cyclohexyl groups, octyl groups, decyl groups and other alkyl groups; phenyl groups An aryl group such as a tolyl group; an aralkyl group such as a benzyl group or a phenylethyl group; a chloromethyl group in which some or all of the hydrogen atoms of these groups are substituted with a halogen atom such as chlorine, bromine or fluorine; Examples include 3,3-trifluoropropyl group. Among them
- a is a positive number of 0.0001 to 0.2, preferably 0.0005 to 0.1, and more preferably 0.001 to 0.05.
- b is a positive number of 1.7 to 2.2, and preferably a positive number of 1.9 to 2.02. Further, a + b needs to satisfy the range of 1.9 to 2.4, and preferably 1.95 to 2.05.
- the component (A) must have an average of one or more silicon-bonded alkenyl groups in one molecule, preferably 2 or more, more preferably 2 to 50, and still more preferably 2 to 10 Have. What is necessary is just to select the value of said a and b so that the conditions of this silicon atom bond alkenyl group may be satisfy
- the number of silicon atoms in one molecule of the organopolysiloxane component (A) (that is, the degree of polymerization) is usually 10 to 2,000, but the handling workability of the composition and the properties of the resulting cured product (low From the viewpoint of good elasticity and low stress, the number is preferably 20 to 1,000, more preferably 50 to 500.
- the degree of polymerization can be determined, for example, as the number average degree of polymerization (or number average molecular weight) in terms of polystyrene in gel permeation chromatography (GPC) analysis using toluene or the like as a developing solvent.
- the molecular structure of the organopolysiloxane of component (A) is not particularly limited, and even if it is linear, it is branched, for example, containing RSiO 3/2 units, R 1 SiO 3/2 units, SiO 2 units, etc.
- the organopolysiloxane represented by the following general formula (1a) that is, the main chain is basically composed of repeating diorganosiloxane units, and both ends of the molecular chain are blocked with triorganosiloxy groups. It is preferably a chain diorganopolysiloxane.
- each R 5 independently represents a substituted or unsubstituted monovalent hydrocarbon group that does not contain an aliphatic unsaturated bond
- each R 6 independently represents a substituted or unsubstituted monovalent hydrocarbon group that does not contain an aliphatic unsaturated bond.
- M is an integer from 0 to 50
- n is an integer from 0 to 50
- when neither R 6 at both ends of the molecular chain is an alkenyl group, k is 40 to 1,200.
- M is an integer of 1 to 50, preferably an integer of 2 to 50, and n is an integer of 0 to 50.
- the substituted or unsubstituted monovalent hydrocarbon group not containing an aliphatic unsaturated bond other than the alkenyl group represented by R 5 is usually 1 to 10 carbon atoms, preferably 1 to 1 carbon atom. 6 things. Specific examples thereof include those exemplified for R 1 in the general formula (1). Among them, a methyl group, a phenyl group or a 3,3,3-trifluoropropyl group is preferable from the viewpoint of easy synthesis and chemical stability at high temperatures.
- the substituted or unsubstituted monovalent hydrocarbon group independently containing an aliphatic unsaturated bond represented by R 6 is usually 1 to 10 carbon atoms, preferably 1 ⁇ 6. Specific examples thereof include those exemplified for R 1 in the general formula (1). Among them, a methyl group, a phenyl group or a 3,3,3-trifluoropropyl group is preferable from the viewpoint of easy synthesis and chemical stability at high temperatures.
- the alkenyl group represented by R 6 is usually one having 2 to 6, preferably 2 to 4, more preferably 2 to 3 carbon atoms. Specific examples thereof include a vinyl group, an allyl group, a propenyl group, an isopropenyl group, a butenyl group, and an isobutenyl group, and a vinyl group is particularly preferable.
- organopolysiloxane represented by the general formula (1a) examples include a dimethylvinylsiloxy group-blocked dimethylpolysiloxane at both ends, a dimethylvinylsiloxy group-blocked dimethylsiloxane / methylvinylsiloxane copolymer at both ends, and dimethylvinyl at both ends.
- silane-blocked dimethylsiloxane / diphenylsiloxane copolymer both ends dimethylvinylsiloxy group-blocked dimethylsiloxane / methylphenylsiloxane copolymer, both ends dimethylvinylsiloxy group-blocked dimethylsiloxane / methylvinylsiloxane / diphenylsiloxane copolymer, both Terminal dimethylvinylsiloxy group-blocked methyltrifluoropropylpolysiloxane, both ends dimethylvinylsiloxy group-blocked dimethylsiloxane / methyltrifluoropropylsiloxane copolymer , Both ends dimethylvinylsiloxy group-blocked dimethylsiloxane / methyltrifluoropropylsiloxane / methylvinylsiloxane copolymer, both ends trimethylsiloxy group-blocked
- the viscosity of the organopolysiloxane of component (A) is not particularly limited, but the viscosity at 25 ° C. is 50 to 100, because the handling workability of the composition, the strength of the resulting cured product, and the fluidity are good. 000 mPa ⁇ s is preferred, and 100 to 10,000 mPa ⁇ s is more preferred.
- the viscosity can be measured with a rotational viscometer (for example, BL type, BH type, BS type, cone plate type, rheometer, etc.).
- the organopolysiloxane of component (A) may be a mixture of two or more.
- the component (B) of the silicone gel composition of the present invention reacts with the component (A) to act as a crosslinking agent (curing agent), and the molecular structure of the organohydrogenpolysiloxane is , Linear, cyclic, branched, and three-dimensional network (resin).
- This component (B) is an organohydrogenpolysiloxane having two or more hydrogen atoms (SiH groups) bonded to silicon atoms in one molecule, represented by the following general formula (ie, average composition formula) (2) It is.
- R 2 c H d SiO (4-cd) / 2 (2) (Wherein R 2 independently represents a substituted or unsubstituted monovalent hydrocarbon group not containing an aliphatic unsaturated bond, c is a positive number of 0.7 to 2.2, and d is 0.001. (It is a positive number of ⁇ 1, and c + d is 0.8 to 3.)
- the organohydrogenpolysiloxane has 2 or more silicon-bonded hydrogen atoms (SiH groups) in one molecule, preferably 3 to 500, more preferably 5 to 100, and particularly preferably 10 to 80. It is.
- This silicon-bonded hydrogen atom (SiH group) may be either bonded to the silicon atom at the end of the molecular chain or bonded to the silicon atom at the non-terminal end of the molecular chain (in the middle of the molecular chain). It may be.
- R 2 independently represents a substituted or unsubstituted monovalent hydrocarbon group that does not contain an aliphatic unsaturated bond, and the number of carbon atoms is usually 1 to 10, preferably 1 to 6. It is. Specific examples thereof include methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, tert-butyl group, pentyl group, neopentyl group, hexyl group, cyclohexyl group, octyl group, nonyl group, decyl group.
- An alkyl group such as phenyl group, tolyl group, xylyl group, naphthyl group, etc .; aralkyl group such as benzyl group, phenylethyl group, phenylpropyl group, etc .; And a 3,3,3-trifluoropropyl group substituted with a halogen atom such as bromine and fluorine.
- a halogen atom such as bromine and fluorine.
- an alkyl group, an aryl group, and a 3,3,3-trifluoropropyl group are preferable, and a methyl group, a phenyl group, and a 3,3,3-trifluoropropyl group are more preferable.
- c is a positive number of 0.7 to 2.2, and preferably a positive number of 1.0 to 2.1.
- d is a positive number of 0.001 to 1, preferably 0.005 to 0.8, more preferably 0.01 to 0.6.
- c + d is 0.8 to 3, preferably 1.0 to 2.7, more preferably 1.5 to 2.5.
- the number of silicon atoms in one molecule of the organohydrogenpolysiloxane component (B) is usually 2 to 1,000, but the handling workability of the composition and the properties of the resulting cured product From the viewpoint of good (low elastic modulus, low stress), it is preferably 4 to 500, more preferably 10 to 200, and still more preferably 20 to 100.
- the viscosity of the organohydrogenpolysiloxane of component (B) is not particularly limited, but for the same reason as above, the viscosity at 25 ° C. is 0.1 to 5,000 mPa ⁇ s, particularly 0.5 to 1,000 mPa. ⁇ S, preferably about 1 to 500 mPa ⁇ s.
- organohydrogenpolysiloxane represented by the general formula (2) examples include 1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetramethyltetracyclosiloxane, and tris (dimethyl).
- the amount of component (B) added is such that 0.6 to 3 hydrogen atoms bonded to silicon atoms per alkenyl group of component (A), preferably 0.7 to 2, More preferably, the amount is 0.8 to 1.5.
- the (B) component organohydrogenpolysiloxane may be a mixture of two or more.
- Component (C) of the silicone gel composition of the present invention is a catalyst for promoting the addition reaction between the silicon atom-bonded alkenyl group in component (A) and the silicon atom-bonded hydrogen atom in component (B). It is what is used.
- the component (C) is a platinum-based catalyst (a platinum group metal compound selected from platinum and a platinum-based compound), and a known one can be used. Specific examples thereof include alcohol-modified products such as platinum black, chloroplatinic acid, and chloroplatinic acid; complexes of chloroplatinic acid and olefins, aldehydes, vinyl siloxanes, acetylene alcohols, and the like.
- the compounding amount of the component (C) may be an effective amount and can be appropriately increased or decreased depending on the desired curing rate, but is usually the mass of the platinum atom with respect to the total amount of the component (A) and the component (B), Usually, it is in the range of 0.1 to 1,000 ppm, preferably 1 to 300 ppm. If the amount is too large, the heat resistance of the resulting cured product may decrease.
- the component (D) of the silicone gel composition of the present invention is a component for imparting excellent heat resistance to the cured product of the silicone gel composition, and is a carbon nanotube.
- a carbon nanotube is a substance in which a six-membered ring network (graphene sheet) made of carbon is a single-layer (single wall) or multi-wall (multi-wall) coaxial tube, and has a diameter of several nanometers to several hundred nanometers. It is known as a structure consisting of
- the carbon nanotube used for the component (D) of the present invention preferably has a length of 0.1 to 30 ⁇ m, more preferably 0.1 to 15 ⁇ m. When the length is 0.1 ⁇ m or more, uniform dispersion is easy, and when the length is 30 ⁇ m or less, precipitation is difficult.
- Carbon nanotubes are not limited in size as long as they have a diameter of 0.5 to 100 nm.
- the carbon nanotube is not particularly limited to the production method, but for example, the carbon nanotube synthesized by plasma CVD (chemical vapor deposition) method, thermal CVD method, surface decomposition method, fluidized gas phase synthesis method, arc discharge method, etc. preferable.
- the carbon nanotube a single wall nanotube (SWNT), a multi wall nanotube (MWNT), a double wall nanotube (DWNT), and the like are known depending on the structure, and any of these can be used.
- commercially available carbon nanotubes can also be used as appropriate.
- Component (D) is added in an amount of 0.01 to 3 parts by weight, preferably 0.02 to 2 parts by weight, more preferably 0.03 to 1 part by weight per 100 parts by weight of component (A). It is. If it is less than 0.01 part by mass, heat resistance cannot be obtained, and if it exceeds 3 parts by mass, no further effect is exhibited.
- optional ingredients can be blended in the composition of the present invention as necessary.
- this optional component include reaction inhibitors, inorganic fillers, organopolysiloxanes that do not contain silicon-bonded hydrogen atoms and silicon-bonded alkenyl groups, flame retardant agents, thixotropic agents, pigments, and dyes. Can be mentioned.
- the reaction inhibitor is a component for suppressing the reaction of the composition, and specifically includes, for example, acetylene-based, amine-based, carboxylic acid ester-based, phosphite-based reaction inhibitor, and the like. It is done.
- inorganic fillers examples include fumed silica, crystalline silica, precipitated silica, hollow filler, silsesquioxane, fumed titanium dioxide, magnesium oxide, zinc oxide, iron oxide, aluminum hydroxide, magnesium carbonate, and calcium carbonate.
- inorganic fillers such as zinc carbonate, layered mica, carbon black, diatomaceous earth, and glass fiber; these fillers can be organic silicon compounds such as organoalkoxysilane compounds, organochlorosilane compounds, organosilazane compounds, and low molecular weight siloxane compounds. Examples thereof include a surface hydrophobized filler. Silicone rubber powder, silicone resin powder, and the like may also be blended.
- organopolysiloxanes that do not contain silicon-bonded hydrogen atoms and silicon-bonded alkenyl groups, flame retardant imparting agents, thixotropic imparting agents, pigments, dyes and the like are not particularly limited, and known ones can be used. .
- the composition of the present invention can be prepared by mixing the above components (A) to (D) (including optional components when optional components are blended) according to a conventional method. Thereafter, the silicone gel cured product is obtained by curing the composition of the present invention under normal temperature or a temperature condition according to the application.
- the silicone gel composition of the present invention contains a carbon nanotube that has a low elastic modulus and low stress when cured, and imparts excellent heat resistance to the cured product, so The cured silicone gel is excellent in heat resistance.
- the penetration of the silicone gel cured product as defined by JIS K 2220 (1/4 cone) is preferably 10 to 200. With such penetration, a cured silicone gel having a low elastic modulus and low stress is more surely obtained.
- the rate of change of penetration (measure of softness) after heating the cured silicone gel at 230 ° C. for 1,000 hours is ⁇ 70% or more.
- “change rate is ⁇ 70% or more” in the present invention means that the penetration value after heating is 30% or more of the penetration value before heating. This means that the rate of change in the degree of penetration does not become larger than minus 70% (that is, the increase in the hardness of the silicone gel after heating is suppressed).
- the silicone gel composition of the present invention is a cured silicone gel having a low elastic modulus and low stress when cured and excellent heat resistance at 230 ° C. Furthermore, the elastic modulus and stress of the cured silicone gel can be kept low even if the silicone gel is left for a long time at 230 ° C. after curing. Therefore, the silicone gel composition of the present invention can be suitably used for protecting electronic parts such as in-vehicle electronic parts and consumer electronic parts.
- Vi represents “vinyl group”.
- a viscosity shows the measured value with a rotational viscometer in 25 degreeC.
- Example 1 Of the two monofunctional siloxy units at both ends of the molecular chain, an average of 0.58 was blocked with a dimethylvinylsiloxy group, and the remaining 1.42 was blocked with a trimethylsiloxy group, and the viscosity was 800 mPa ⁇ s.
- Example 2 A composition B was prepared in the same manner as in Example 1 except that 0.06 parts by mass of carbon nanotubes were used. When the obtained composition B was heat-cured at 120 ° C. for 30 minutes, a cured product B having a penetration of 66 was obtained.
- Example 3 In Example 1, Composition C was prepared in the same manner except that 0.09 parts by mass of carbon nanotubes were used. When the obtained composition C was heated and cured at 120 ° C. for 30 minutes, a cured product C having a penetration of 67 was obtained.
- composition D was prepared in the same manner as in Example 1 except that no carbon nanotube was used. When the obtained composition D was heat-cured at 120 ° C. for 30 minutes, a cured product D having a penetration of 65 was obtained.
- the cured silicone gel before the heat resistance test has a low elastic modulus and low stress, and the needle after the heat resistance test.
- the rate of change in the input is -60% to + 9%, and the silicone gel cured product retains its softness even when it is placed at a high temperature of 230 ° C for a long time, and the elastic modulus and stress are kept low. I was able to. Further, the penetration was not changed even after the cold resistance test, and the cold resistance was equivalent to that of Comparative Example 1.
- Comparative Example 1 containing no carbon nanotube the cured product before the heat resistance test had a low elastic modulus and low stress, but the rate of change in the penetration after the heat resistance test was ⁇ 98%, which was 230 ° C.
- the cured silicone gel was hardened by being placed under a high temperature condition for a long time, and the elastic modulus and stress increased.
- the silicone gel composition of the present invention is a cured silicone gel having a low elastic modulus and low stress when cured and excellent heat resistance at 230 ° C. Furthermore, it was clarified that the cured silicone gel retains its softness even when it is placed at a high temperature of 230 ° C. for a long time after curing, and the elastic modulus and stress can be kept low.
- the present invention is not limited to the above embodiment.
- the above-described embodiment is an exemplification, and the present invention has any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and that exhibits the same effects. Are included in the technical scope.
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Abstract
Description
(A)下記一般式(1)で表される、一分子中にケイ素原子に結合したアルケニル基を1個以上有するオルガノポリシロキサン:100質量部、
RaR1 bSiO(4-a-b)/2 (1)
(式中、Rは独立にアルケニル基であり、R1は独立に脂肪族不飽和結合を含まない置換又は非置換の1価炭化水素基であり、aは0.0001~0.2の正数であり、bは1.7~2.2の正数であり、a+bは1.9~2.4である。)
(B)下記一般式(2)で表される、一分子中にケイ素原子に結合した水素原子を2個以上有するオルガノハイドロジェンポリシロキサン:前記(A)成分中のケイ素原子に結合したアルケニル基1個あたり前記ケイ素原子に結合した水素原子が0.6~3個となる量、
R2 cHdSiO(4-c-d)/2 (2)
(式中、R2は独立に脂肪族不飽和結合を含まない置換又は非置換の1価炭化水素基であり、cは0.7~2.2の正数であり、dは0.001~1の正数であり、c+dは0.8~3である。)
(C)白金系触媒:有効量、及び
(D)カーボンナノチューブ:0.01~3質量部、
を含有するシリコーンゲル組成物を提供する。
従って、このような本発明のシリコーンゲル組成物は、車載電子部品、民生用電子部品等の電子部品の保護に好適に用いることができる。
(A)下記一般式(1)で表される、一分子中にケイ素原子に結合したアルケニル基を1個以上有するオルガノポリシロキサン:100質量部、
RaR1 bSiO(4-a-b)/2 (1)
(式中、Rは独立にアルケニル基であり、R1は独立に脂肪族不飽和結合を含まない置換又は非置換の1価炭化水素基であり、aは0.0001~0.2の正数であり、bは1.7~2.2の正数であり、a+bは1.9~2.4である。)
(B)下記一般式(2)で表される、一分子中にケイ素原子に結合した水素原子を2個以上有するオルガノハイドロジェンポリシロキサン:前記(A)成分中のケイ素原子に結合したアルケニル基1個あたり前記ケイ素原子に結合した水素原子が0.6~3個となる量、
R2 cHdSiO(4-c-d)/2 (2)
(式中、R2は独立に脂肪族不飽和結合を含まない置換又は非置換の1価炭化水素基であり、cは0.7~2.2の正数であり、dは0.001~1の正数であり、c+dは0.8~3である。)
(C)白金系触媒:有効量、及び
(D)カーボンナノチューブ:0.01~3質量部、
を含有するシリコーンゲル組成物である。
なお、本明細書において、粘度は25℃における値である。
本発明のシリコーンゲル組成物の(A)成分は、シリコーンゲル組成物の主剤(ベースポリマー)である。この(A)成分は、下記一般式(即ち、平均組成式)(1)で表される、一分子中にケイ素原子に結合したアルケニル基(本明細書中において「ケイ素原子結合アルケニル基」という)を1個以上有するオルガノポリシロキサンである。
RaR1 bSiO(4-a-b)/2 (1)
(式中、Rは独立にアルケニル基であり、R1は独立に脂肪族不飽和結合を含まない置換又は非置換の1価炭化水素基であり、aは0.0001~0.2の正数であり、bは1.7~2.2の正数であり、a+bは1.9~2.4である。)
また、(A)成分のオルガノポリシロキサンは2種以上の混合物であってもよい。
次に、本発明のシリコーンゲル組成物の(B)成分は、上記(A)成分と反応し、架橋剤(硬化剤)として作用するものであって、該オルガノハイドロジェンポリシロキサンの分子構造は、直鎖状、環状、分岐鎖状、三次元網状(レジン状)のいずれであってもよい。この(B)成分は、下記一般式(即ち、平均組成式)(2)で表される、一分子中にケイ素原子に結合した水素原子(SiH基)を2個以上有するオルガノハイドロジェンポリシロキサンである。
R2 cHdSiO(4-c-d)/2 (2)
(式中、R2は独立に脂肪族不飽和結合を含まない置換又は非置換の1価炭化水素基であり、cは0.7~2.2の正数であり、dは0.001~1の正数であり、c+dは0.8~3である。)
(B)成分のオルガノハイドロジェンポリシロキサンの粘度は、特に限定されないが、上記と同様の理由で、25℃における粘度が0.1~5,000mPa・s、特には0.5~1,000mPa・s、とりわけ1~500mPa・s程度であることが好ましい。
(B)成分のオルガノハイドロジェンポリシロキサンは2種以上の混合物であってもよい。
本発明のシリコーンゲル組成物の(C)成分は、上記(A)成分中のケイ素原子結合アルケニル基と上記(B)成分中のケイ素原子結合水素原子との付加反応を促進させるための触媒として使用されるものである。この(C)成分は白金系触媒(白金及び白金系化合物から選ばれる白金族金属化合物)であり、公知のものを使用することができる。その具体例としては、白金ブラック、塩化白金酸、塩化白金酸等のアルコール変性物;塩化白金酸とオレフィン、アルデヒド、ビニルシロキサン又はアセチレンアルコール類等との錯体等が例示される。
本発明のシリコーンゲル組成物の(D)成分は、シリコーンゲル組成物の硬化物に優れた耐熱性を付与するための成分で、カーボンナノチューブである。カーボンナノチューブは、炭素によって作られる六員環ネットワーク(グラフェンシート)が単層(シングルウォール)あるいは多層(マルチウォール)の同軸管状になった物質であり、直径数nm~数百nm程度の炭素原子からなる構造体として知られている。本発明の(D)成分に用いられるカーボンナノチューブとしては、長さが0.1~30μmのものが好ましく、0.1~15μmのものがより好ましい。長さが0.1μm以上であれば均一分散しやすく、30μm以下であれば沈降しにくい。また、カーボンナノチューブは、直径が0.5~100nmのものならその大きさには限定されない。
また、本発明においては、市販品のカーボンナノチューブを適宜使用することもできる。
本発明の組成物には、上記(A)~(D)成分以外にも、必要に応じて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、反応抑制剤、無機質充填剤、ケイ素原子結合水素原子及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、難燃性付与剤、チクソ性付与剤、顔料、染料等が挙げられる。
本発明の組成物は、上記(A)~(D)成分(任意成分が配合される場合には、任意成分も含む)を常法に準じて混合することにより調製することができる。その後、本発明の組成物を常温もしくは用途に応じた温度条件下で硬化させることによりシリコーンゲル硬化物が得られる。
このような針入度であれば、より確実に低弾性率かつ低応力のシリコーンゲル硬化物となる。
変化率={(加熱後の針入度-加熱前の針入度)/(加熱前の針入度)}×100(%)
として計算することができる。この式からも判るように、本発明でいう「変化率が-70%以上」とは、加熱後の針入度値が加熱前の針入度値の30%以上を保持しており、針入度の変化率が-70%よりもマイナス側に大きくならない(即ち、加熱後のシリコーンゲルの硬度の増大が抑制されている)ことを意味している。
このようなシリコーンゲル硬化物であれば、硬化後230℃の高温条件下に長時間置かれても針入度が低下しすぎない。即ち、シリコーンゲル硬化物の弾性率や応力を低く保つことができる。
従って、このような本発明のシリコーンゲル組成物は、車載電子部品、民生用電子部品等の電子部品の保護に好適に用いることができる。
分子鎖両末端の単官能性シロキシ単位2個のうち平均0.58個がジメチルビニルシロキシ基で封鎖され、かつ、残り平均1.42個がトリメチルシロキシ基で封鎖された、粘度が800mPa・sの直鎖状ジメチルポリシロキサン100質量部、粘度が100mPa・sである分子鎖両末端トリメチルシロキシ基封鎖ジメチルシロキサン・メチルハイドロジェンシロキサン共重合体(ケイ素原子結合水素原子の含有量=0.57質量%)0.88質量部((A)成分中のケイ素原子結合ビニル基に対する(B)成分中のケイ素原子結合水素原子のモル比:SiH/SiVi=1.13)、エチニルシクロヘキサノール0.05質量部、直径9.5nm、長さ1.5μmのカーボンナノチューブ(マルチウォールタイプ)0.03質量部、及び塩化白金酸/1,3-ジビニルテトラメチルジシロキサン錯体を白金原子含有量として1質量%含有するジメチルポリシロキサン溶液0.05質量部、を混合して組成物Aを調製した。得られた組成物Aを120℃で30分間加熱硬化したところ、針入度65の硬化物Aを得た。
実施例1において、カーボンナノチューブを0.06質量部用いる以外は同様にして、組成物Bを調製した。得られた組成物Bを120℃で30分間加熱硬化したところ、針入度66の硬化物Bを得た。
実施例1において、カーボンナノチューブを0.09質量部用いる以外は同様にして、組成物Cを調製した。得られた組成物Cを120℃で30分間加熱硬化したところ、針入度67の硬化物Cを得た。
実施例1において、カーボンナノチューブを用いなかった以外は同様にして、組成物Dを調製した。得られた組成物Dを120℃で30分間加熱硬化したところ、針入度65の硬化物Dを得た。
上記実施例1~3及び比較例1で得られた組成物A~Dを硬化した硬化物A~Dについて、初期(耐熱性試験前)、及び230℃で1,000時間加熱する耐熱性試験後のJIS K 2220(1/4コーン)で規定される針入度を評価した。結果を表1に示す。
(耐寒性の評価)
上記実施例1~3及び比較例1で得られた組成物A~Dを硬化した硬化物A~Dについて、-40℃24時間放置した後、すぐにJIS K 2220(1/4コーン)で規定される針入度を評価した。結果を表1に示す。
一方、カーボンナノチューブを含まない比較例1では、耐熱性試験前の硬化物は低弾性率及び低応力であるものの、耐熱性試験後の針入度の変化率が-98%であり、230℃の高温条件下に長時間置かれることでシリコーンゲル硬化物が硬くなり、弾性率や応力が高くなった。
Claims (3)
- (A)下記一般式(1)で表される、一分子中にケイ素原子に結合したアルケニル基を1個以上有するオルガノポリシロキサン:100質量部、
RaR1 bSiO(4-a-b)/2 (1)
(式中、Rは独立にアルケニル基であり、R1は独立に脂肪族不飽和結合を含まない置換又は非置換の1価炭化水素基であり、aは0.0001~0.2の正数であり、bは1.7~2.2の正数であり、a+bは1.9~2.4である。)
(B)下記一般式(2)で表される、一分子中にケイ素原子に結合した水素原子を2個以上有するオルガノハイドロジェンポリシロキサン:前記(A)成分中のケイ素原子に結合したアルケニル基1個あたり前記ケイ素原子に結合した水素原子が0.6~3個となる量、
R2 cHdSiO(4-c-d)/2 (2)
(式中、R2は独立に脂肪族不飽和結合を含まない置換又は非置換の1価炭化水素基であり、cは0.7~2.2の正数であり、dは0.001~1の正数であり、c+dは0.8~3である。)
(C)白金系触媒:有効量、及び
(D)カーボンナノチューブ:0.01~3質量部、
を含有するものであることを特徴とするシリコーンゲル組成物。 - 前記シリコーンゲル組成物を硬化した際のJIS K 2220(1/4コーン)で規定される針入度が、10~200のものであることを特徴とする請求項1に記載のシリコーンゲル組成物。
- 請求項1又は請求項2に記載のシリコーンゲル組成物を硬化してなるシリコーンゲル硬化物であって、該シリコーンゲル硬化物を230℃で1,000時間加熱した後の針入度の加熱前からの変化率が-70%以上のものであることを特徴とするシリコーンゲル硬化物。
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JPWO2015056374A1 (ja) | 2017-03-09 |
JP6023894B2 (ja) | 2016-11-09 |
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