Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K3/00—Materials not provided for elsewhere
  • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
  • C09K3/1006—Materials in mouldable or extrudable form for sealing or packing joints or covers characterised by the chemical nature of one of its constituents
• • 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
  • C08K3/34—Silicon-containing compounds
  • C08K3/36—Silica
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • C08L33/04—Homopolymers or copolymers of esters
  • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
  • C08L33/062—Copolymers with monomers not covered by C08L33/06
  • C08L33/064—Copolymers with monomers not covered by C08L33/06 containing anhydride, COOH or COOM groups, with M being metal or onium-cation
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/02—Sealings between relatively-stationary surfaces
  • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
  • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
  • F16J15/102—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by material
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/16—Sealings between relatively-moving surfaces
  • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
  • F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L11/00—Hoses, i.e. flexible pipes
  • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/10—Esters
  • C08F220/12—Esters of monohydric alcohols or phenols
  • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
  • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
  • C08F220/1802—C2-(meth)acrylate, e.g. ethyl (meth)acrylate
• • 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
  • C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
  • C08G77/26—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen nitrogen-containing groups
• • 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
  • C08K2201/006—Additives being defined by their surface area
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
  • C09K2200/02—Inorganic compounds
  • C09K2200/0243—Silica-rich compounds, e.g. silicates, cement, glass
  • C09K2200/0247—Silica
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
  • C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
  • C09K2200/0615—Macromolecular organic compounds, e.g. prepolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C09K2200/0625—Polyacrylic esters or derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
  • C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
  • C09K2200/068—Containing also other elements than carbon, oxygen or nitrogen in the polymer main chain
  • C09K2200/0685—Containing silicon

Definitions

• the present invention relates to a rubber composition and a cured product thereof.
• Cured products of rubber compositions containing acrylic rubber have excellent physical properties such as heat resistance, oil resistance, mechanical properties, and compression set properties, so they are used as hose members in automobile engine compartments, seal members, Widely used as a material for gasket members, etc.
• these automobile parts are required to have higher reliability due to the influence of exhaust gas countermeasures and higher engine output.
• the member is required to have excellent strength, elongation, and compression set characteristics.
• Patent Document 1 discloses a rubber composition that contains a white filler and can be processed to form a cured product with good mechanical properties.
• An object of the present invention is to provide a rubber composition that can form a cured product with high strength.
• the present invention includes the following embodiments.
• Acrylic rubber that is a copolymer of monomers containing alkyl (meth)acrylate; Silica and a polyorganosiloxane having two or more amino groups per molecule; A rubber composition containing.
• the acrylic rubber is a carboxyl group-containing acrylic rubber that is a copolymer of a monomer containing an alkyl (meth)acrylate, a carboxyl group-containing monomer, and an olefin, [1] or [2] The rubber composition described in ].
• the acrylic rubber is an epoxy group-containing acrylic rubber that is a copolymer of a monomer containing an alkyl (meth)acrylate, an epoxy group-containing monomer, an olefin, and a vinyl carboxylate; [ 4].
• a rubber composition capable of forming a cured product having high strength can be provided.
• the rubber composition according to the present embodiment includes an acrylic rubber that is a copolymer of a monomer containing an alkyl (meth)acrylate, silica, and a polyorganosiloxane having two or more amino groups per molecule. .
• the polyorganosiloxane having two or more amino groups per molecule contained in the rubber composition according to the present embodiment is highly compatible with acrylic rubber, which is a copolymer of monomers containing alkyl (meth)acrylates. Therefore, it is presumed that the dispersibility of silica in the rubber composition is improved.
• the amino groups of the polyorganosiloxane bond with the acrylic rubber, and the siloxane skeleton is located near the silica, but it is believed that the strength of the resulting cured product is improved due to the high dispersibility of silica. It will be done. Moreover, this allows the cured product to have high elongation.
• the cured product has high compression set properties comparable to those of conventional rubber compositions using carbon black or cured products using silane coupling agents having amino groups or epoxy groups. can have
• the rubber composition according to the present embodiment includes an acrylic rubber that is a copolymer of a monomer containing an alkyl (meth)acrylate.
• (Meth)alkyl acrylate” refers to alkyl acrylate and alkyl methacrylate.
• alkyl (meth)acrylates include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, and n-pentyl (meth)acrylate.
• Acrylate isoamyl (meth)acrylate, n-hexyl (meth)acrylate, 2-methylpentyl (meth)acrylate, n-octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-decyl (meth)acrylate, n -dodecyl (meth)acrylate, n-octadecyl (meth)acrylate, etc. These may be used alone or in combination of two or more.
• alkyl (meth)acrylates in which the alkyl moiety of the alkyl (meth)acrylate has 1 to 4 carbon atoms are selected as alkyl (meth)acrylates. is preferred. Specifically, methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, n-butyl (meth)acrylate, and isobutyl (meth)acrylate are preferred.
• the monomer constituting the copolymer preferably contains 60 to 99% by mass of alkyl (meth)acrylate, more preferably 70 to 99% by mass, and even more preferably 80 to 98% by mass.
• the monomer further contains a carboxyl group-containing monomer or an epoxy group-containing monomer in addition to the alkyl (meth)acrylate.
• the acrylic rubber according to the present embodiment is a carboxyl group-containing acrylic rubber that is a copolymer of a monomer containing an alkyl (meth)acrylate and a monomer containing a carboxyl group, or an alkyl (meth)acrylate.
• An epoxy group-containing acrylic rubber that is a copolymer of a monomer containing an epoxy group-containing monomer and an epoxy group-containing monomer is preferable.
• the carboxyl group-containing monomer and the epoxy group-containing monomer function as a crosslinking site monomer (a monomer having a functional group constituting a crosslinking point).
• carboxyl group-containing monomers examples include acrylic acid, methacrylic acid, crotonic acid, 2-pentenoic acid, maleic acid, fumaric acid, itaconic acid, monoalkyl maleate, monoalkyl fumarate, monocyclohexyl maleate, and fumaric acid.
• Examples include monocyclohexyl and cinnamic acid.
• Examples of the epoxy group-containing monomer include glycidyl acrylate, glycidyl methacrylate, allyl glycidyl ether, and meta-allyl glycidyl ether. These may be used alone or in combination of two or more.
• the monomer constituting the copolymer contains a carboxyl group-containing monomer or an epoxy group-containing monomer
• the monomer contains a carboxyl group-containing monomer or an epoxy group-containing monomer of 0.1 to
• the content is preferably 5% by mass, more preferably 0.5 to 3% by mass, and even more preferably 1 to 2% by mass.
• the monomer preferably further contains an olefin in addition to the alkyl (meth)acrylate, the carboxyl group-containing monomer, or the epoxy group-containing monomer.
• the acrylic rubber according to the present embodiment is a carboxyl group-containing acrylic rubber that is a copolymer of a monomer containing an alkyl (meth)acrylate, a carboxyl group-containing monomer, and an olefin, or (meth)
• it is an epoxy group-containing acrylic rubber that is a copolymer of a monomer containing an alkyl acrylate, an epoxy group-containing monomer, and an olefin. Olefins can improve the mechanical properties and cold resistance of cured products.
• the olefin examples include ethylene, butadiene, and isoprene. These may be used alone or in combination of two or more. Among these, the olefin is preferably ethylene, which does not contain a double bond that causes a decrease in heat resistance after the reaction.
• the monomer constituting the copolymer contains an olefin
• the monomer preferably contains 0.1 to 5% by mass of olefin, and preferably 0.3 to 4% by mass. %, and even more preferably 0.5 to 2% by mass.
• Commercially available carboxyl group-containing acrylic rubbers which are copolymers of monomers containing alkyl (meth)acrylates, carboxyl group-containing monomers, and olefins, include Denka ER A322 (trade name, Denka Co., Ltd.). ), Denka ER A413 (trade name, manufactured by Denka Co., Ltd.), and the like.
• the monomer contains an alkyl (meth)acrylate, an epoxy group-containing monomer, and an olefin
• the monomer further contains a vinyl carboxylate.
• the acrylic rubber according to the present embodiment is an epoxy group-containing acrylic rubber that is a copolymer of monomers containing an alkyl (meth)acrylate, an epoxy group-containing monomer, an olefin, and a vinyl carboxylate. It is preferable that there be.
• Vinyl carboxylate can improve the mechanical properties of cured products.
• vinyl carboxylate examples include vinyl acetate, vinyl propionate, vinyl 2-ethylhexanoate, vinyl laurate, vinyl neodecanoate, and the like. These may be used alone or in combination of two or more. Among these, vinyl acetate is preferred as the vinyl carboxylate from the viewpoint of strength.
• the monomer constituting the copolymer contains vinyl carboxylate
• the monomer preferably contains 1 to 20% by mass of vinyl carboxylate, and preferably 3 to 17% by mass of vinyl carboxylate. %, and even more preferably 5 to 15% by mass.
• Commercially available epoxy group-containing acrylic rubbers which are copolymers of monomers containing alkyl (meth)acrylates, epoxy group-containing monomers, olefins, and vinyl carboxylates, include Denka ER 5300 (product name). (manufactured by Denka Co., Ltd.), etc.
• the acrylic rubber can be obtained by copolymerizing the monomers using known methods such as emulsion polymerization, suspension polymerization, solution polymerization, and bulk polymerization.
• the rubber composition according to this embodiment contains silica as a filler.
• silica as a filler, the dispersibility of the filler in the rubber composition according to this embodiment is improved, and the resulting cured product has high strength and elongation.
• Silica is not particularly limited, and examples thereof include wet silica, dry silica, and silica fume.
• the BET specific surface area of the silica is preferably 100 to 130 m 2 /g.
• the BET specific surface area of silica is within the range of 100 to 130 m 2 /g, agglomeration of silica can be suppressed and reinforcing properties by silica can be sufficiently exhibited. Therefore, the obtained cured product can have high strength.
• the BET specific surface area is a value measured by the BET method.
• the mass ratio of silica to acrylic rubber is preferably 0.2 to 1.0 from the viewpoint of improving the strength and elongation of the cured product. , more preferably 0.3 to 0.8, and even more preferably 0.4 to 0.6.
• the rubber composition according to this embodiment includes a polyorganosiloxane having two or more amino groups per molecule.
• a silane coupling agent having an amino group or an epoxy group has been used in combination.
• a cured product with excellent strength can be formed by using a polyorganosiloxane having two or more amino groups per molecule instead of the silane coupling agent.
• the cured product also has good elongation and compression set properties.
• the polyorganosiloxane having two or more amino groups per molecule preferably has the following structural unit (I) from the viewpoint of improving the strength of the cured product.
• [R 1 x R a SiO (4-(x+a))/2 ] (I) (In formula (I), x is 1, 2 or 3, a is 0, 1 or 2, x+a ⁇ 4, and each R is independently methyl, ethyl, propyl, phenyl or hydroxy; , R 1 are each independently a monovalent organic residue having an NH 2 group.)
• x is preferably 1. Further, a is preferably 1 or 2, and more preferably 1.
• R is preferably methyl or hydroxy, more preferably methyl.
• R 1 include -R 2 -NH 2 , -R 2 -N(R 3 )-NH 2 and -R 2 -N(R 3 )-R 4 -NH 2 .
• R 2 and R 4 are independently of each other an alkylene or alkyleneoxy group having 1 to 20 carbon atoms. Preferably it is an alkylene group having 1 to 5 carbon atoms.
• R 3 is hydrogen or an alkyl group having 1 to 5 carbon atoms.
• R 1 is preferably -R 2 -NH 2 .
• R 2 is preferably an alkylene group having 1 to 5 carbon atoms, preferably an alkylene group having 2 to 4 carbon atoms, especially an aminopropyl group.
• At least two amino groups per molecule of polyorganosiloxane are preferably located in different R 1 groups, more preferably in different structural units (I), and preferably in different structural units ID as described below. is even more preferable.
• the polyorganosiloxane according to the present embodiment can further include the following structural unit (II D ).
• R' is the same or different groups (preferably the same groups) and is a linear, branched or cyclic organic residue that can be bonded via an oxygen atom.
• R' is preferably methyl, ethyl, propyl or phenyl, particularly preferably methyl.
• the polyorganosiloxane according to the present embodiment can further include the following structural unit (III M ).
• III M [R'' 3 SiO 1/2 ]
• R'' is the same or different group and is a hydroxy, linear, branched or cyclic organic residue that can be bonded via an oxygen atom.
• R'' is preferably hydroxy, methyl, ethyl, propyl or phenyl, particularly preferably hydroxy or methyl.
• R'' can be the same group and be methyl.
• the structural unit (III M ) can be [(CH 3 ) 2 (HO)SiO 1/2 ].
• the preferred structure of the polyorganosiloxane according to this embodiment is as follows. [I D ] m [I M ] n [II D ] o [III M ] (2-n)
• m is in the range from 0 to 40 and n can be 0, 1 or 2.
• n can be 0, 1 or 2.
• m+n is at least 2
• m+n is preferably up to 20.
• o is within the range of 0 to 1000.
• m+o+2 is at least 3.
• polyorganosiloxanes having the structural unit (I) include, for example, Structol HT750, HT740, HT760 (trade name, manufactured by Structol), KF-864, KF having the structure of the following formula (A). -865, KF-868, KF-8015 (product name, Shin-Etsu Silicone Co., Ltd.), DOWSIL BY 16-213 FLUID (product name, Dow Co., Ltd.), AMS-132, AMS-152, AMS-162, AMS-163, Examples include AMS-191 and AMS-1203 (trade name, Gelest Inc.).
• the mass ratio of the polyorganosiloxane to the acrylic rubber is preferably 0.005 to 0.08, and 0.007 from the viewpoint of improving the strength and elongation of the cured product. It is more preferably from 0.07 to 0.07, and even more preferably from 0.01 to 0.06. Further, the mass ratio of the polyorganosiloxane to the silica (polyorganosiloxane/silica) is preferably 0.01 to 0.3, and 0.02 to 0.0 from the viewpoint of improving the strength and elongation of the cured product. More preferably, it is .2, and even more preferably 0.02 to 0.1.
• the rubber composition according to the present embodiment may optionally contain other components in addition to the acrylic rubber, silica, and polyorganosiloxane described above.
• other components include anti-aging agents, lubricants, vulcanizing agents, vulcanization accelerators, vulcanization retarders, plasticizers, and fillers.
• the cured product according to this embodiment is obtained by curing the rubber composition according to this embodiment. Since the cured product is a cured product of the rubber composition according to the present embodiment, it has particularly excellent strength. Therefore, the cured product can be suitably used for hoses, seals, gaskets, etc.
• the tensile strength, elongation, and compression set of the cured product were measured by the following methods.
• compression set The compression set of the cured product was measured at 175° C. for 72 hours in accordance with JIS K6262.
• a rubber composition was prepared by mixing the following components.
• ⁇ Acrylic rubber Denka ER A322 (trade name, manufactured by Denka Corporation): 100 parts by mass
• ⁇ Silica: Nip Seal ER (trade name, manufactured by Tosoh Silica Corporation, BET specific surface area: 100 m 2 /g): 50 Parts by mass -
• Polyorganosiloxane Structol HT750 (trade name, manufactured by Structol): 2 parts by mass -
• Anti-aging agent DCD (Naugard #445, manufactured by SI Group): 1 part by mass - Lubricant: Stearic acid: 1 part by mass parts, lubricant: stearylamine: 0.3 parts by mass
• vulcanizing agent hexamethylene diamine carbamate: 0.6 parts by mass
• vulcanization accelerator Rhenogran XLA-60 (trade name, manufactured by Lanxess): 1.2 parts by mass
• Denka ER A322 contains 82 parts by
• the rubber composition was kneaded using a pressure kneader and an open roll, and a crosslinking reaction was carried out in a press at 170°C for 20 minutes, and then in a gear oven at 170°C for 4 hours. Thereby, a cured product of the rubber composition was obtained.
• the cured product was measured for tensile strength, elongation, and compression set using the methods described above. The results are shown in Table 1.
• Table 1 the unit of the blending amount of each component is parts by mass, and the blending ratio of each component is shown in mass proportion. The same applies to Tables 2 to 6.
• Example 1 A rubber composition was prepared and cured in the same manner as in Example 1, except that 75 parts by mass of carbon black (SRF) (trade name: SEAST S, manufactured by Tokai Carbon Co., Ltd.) was used as a filler instead of 50 parts by mass of silica. Obtained and evaluated things. The results are shown in Table 1.
• SRF carbon black
• Example 2 A rubber composition was prepared in the same manner as in Example 1, except that 1.1 parts by mass of an amino group-containing silane coupling agent (aminopropyltrimethoxysilane) was used instead of 2 parts by mass of polyorganosiloxane, and a cured product was prepared. was evaluated. The results are shown in Table 1.
• an amino group-containing silane coupling agent aminopropyltrimethoxysilane
• Example 3 A rubber composition was prepared and cured in the same manner as in Example 1, except that 1.5 parts by mass of an epoxy group-containing silane coupling agent (glycidyloxypropyltrimethoxysilane) was used instead of 2 parts by mass of polyorganosiloxane. Obtained and evaluated things. The results are shown in Table 1.
• an epoxy group-containing silane coupling agent glycoloxypropyltrimethoxysilane
• Example 1 using the rubber composition according to the present embodiment in Comparative Example 1 using carbon black as a filler, and in Comparative Example 1 using a silane coupling agent containing an amino group or an epoxy group, The tensile strength was higher than that of Comparative Examples 2 and 3. In addition, the elongation was high, and the compression set was about the same.
• Example 2 A rubber composition was prepared in the same manner as in Example 1, except that the amount of polyorganosiloxane was changed to 1 part by mass, and a cured product was obtained and evaluated. The results are shown in Table 2.
• Example 3 A rubber composition was prepared in the same manner as in Example 1, except that the amount of polyorganosiloxane was changed to 3 parts by mass, and a cured product was obtained and evaluated. The results are shown in Table 2.
• Example 4 A rubber composition was prepared in the same manner as in Example 1, except that the amount of polyorganosiloxane was changed to 4 parts by mass, and a cured product was obtained and evaluated. The results are shown in Table 2.
• Example 5 The amount of silica was 40 parts by mass, the amount of polyorganosiloxane was 2.4 parts by mass, the amount of vulcanizing agent was 0.4 parts by mass, and the amount of vulcanization accelerator was 0.8 parts by mass.
• a rubber composition was prepared in the same manner as in Example 1 except for the following changes, and a cured product was obtained and evaluated. The results are shown in Table 3.
• Example 6 A rubber composition was prepared in the same manner as in Example 5, except that the amount of silica was changed to 50 parts by mass and the amount of polyorganosiloxane was changed to 3 parts by mass, and a cured product was obtained and evaluated. The results are shown in Table 3.
• Example 7 A rubber composition was prepared in the same manner as in Example 5, except that the amount of silica was changed to 60 parts by mass, and the amount of polyorganosiloxane was changed to 3.6 parts by mass, and a cured product was obtained and evaluated. The results are shown in Table 3.
• Example 8 As the silica, use Nip Seal ER (trade name, manufactured by Tosoh Silica Co., Ltd., BET specific surface area: 130 m 2 /g) instead of Nip Seal ER (trade name, manufactured by Tosoh Silica Co., Ltd., BET specific surface area: 100 m 2 / g).
• a rubber composition was prepared in the same manner as in Example 3, except that the amount of polyorganosiloxane was changed to 4 parts by mass, and a cured product was obtained and evaluated. The results are shown in Table 4.
• a rubber composition was prepared by mixing the following components.
• - Acrylic rubber Denka ER 5300 (trade name, manufactured by Denka Corporation): 100 parts by mass - Silica: Nip Seal ER (trade name, manufactured by Tosoh Silica Corporation, BET specific surface area: 100 m 2 /g): 50 Parts by mass - Polyorganosiloxane: Structol HT750 (trade name, manufactured by Structol): 3 parts by mass - Anti-aging agent: DCD (Naugard #445, manufactured by SI Group): 1 part by mass - Lubricant: Stearic acid: 1 part by mass ⁇ Vulcanizing agent: CN-25 (trade name, manufactured by Shikoku Kasei Co., Ltd., 1-cyanoethyl-2-methylimidazole masterbatch product) 1.4 parts by mass ⁇ Vulcanization accelerator: Ammonium benzoate: 0.3 parts by mass - Vulcanization accelerator: Sodium lauryl sulfate: 1 part
• a rubber composition was prepared in the same manner as in Example 1, except that the above rubber composition was used, and a cured product was obtained and evaluated. The results are shown in Table 5.
• Example 4 A rubber composition was prepared in the same manner as in Example 9, except that silica and polyorganosiloxane were not blended, and 75 parts by mass of carbon black (SRF) (trade name: SEAST S, manufactured by Tokai Carbon Co., Ltd.) was blended instead. A cured product was obtained and evaluated. The results are shown in Table 5.
• SRF carbon black
• a rubber composition was prepared by mixing the following components.
• ⁇ Acrylic rubber Acrylic rubber A: 100 parts by mass
• ⁇ Silica: Nip Seal ER (trade name, manufactured by Tosoh Silica Co., Ltd., BET specific surface area: 100 m 2 /g): 50 parts by mass
• ⁇ Polyorganosiloxane Structol HT750 (Product name, manufactured by Structol): 3 parts by mass / Anti-aging agent: DCD (Naugard #445 manufactured by SI Group): 1 part by mass / Lubricant: Stearic acid: 1 part by mass / Lubricant: Stearylamine: 0.3 Parts by mass / Vulcanizing agent: Hexamethylene diamine carbamate: 0.4 parts by mass / Vulcanization accelerator: Rhenogran XLA-60 (trade name, manufactured by LANXESS): 0.8 parts by mass Acrylic rubber A has a polymer composition It contains 46 parts by mass of ethyl acrylate,
• a rubber composition was prepared in the same manner as in Example 1, except that the above rubber composition was used, and a cured product was obtained and evaluated. The results are shown in Table 5.
• Example 5 A rubber composition was prepared in the same manner as in Example 10, except that silica and polyorganosiloxane were not blended, and 75 parts by mass of carbon black (SRF) (trade name: SEAST S, manufactured by Tokai Carbon Co., Ltd.) was blended instead. A cured product was obtained and evaluated. The results are shown in Table 5.
• SRF carbon black
• a rubber composition was prepared by mixing the following components.
• - Acrylic rubber Nipol AR12 (trade name, manufactured by Zeon Corporation): 100 parts by mass - Silica: Nip Seal ER (trade name, manufactured by Tosoh Silica Corporation, BET specific surface area: 100 m 2 /g): 50 Parts by mass - Polyorganosiloxane: Structol HT750 (trade name, manufactured by Structol): 3 parts by mass - Anti-aging agent: DCD (Naugard #445, manufactured by SI Group): 1 part by mass - Lubricant: Stearic acid: 1 part by mass ⁇ Lubricant: Stearylamine: 0.3 parts by mass ⁇ Vulcanizing agent: Hexamethylenediamine carbamate: 0.6 parts by mass ⁇ Vulcanization accelerator: Rhenogran XLA-60 (trade name, manufactured by Lanxess): 2.0 parts by mass Incidentally, Nipol AR12 contains 50 parts by mass of ethyl acryl
• a rubber composition was prepared in the same manner as in Example 1, except that the above rubber composition was used, and a cured product was obtained and evaluated. The results are shown in Table 6.
• Hytemp AR212XP (trade name, manufactured by Zeon Corporation): 100 parts by mass - Silica: Nip Seal ER (trade name, manufactured by Tosoh Silica Corporation, BET specific surface area: 100 m 2 /g): 50 Parts by mass - Polyorganosiloxane: Structol HT750 (trade name, manufactured by Structol): 2 parts by mass - Anti-aging agent: DCD (Naugard #445, manufactured by SI Group): 1 part by mass - Lubricant: Stearic acid: 1 part by mass ⁇ Lubricant: Stearylamine: 0.3 parts by mass ⁇ Vulcanizing agent: Hexamethylenediamine carbamate: 0.6 parts by mass ⁇ Vulcanization accelerator: Rhenogran XLA-60 (trade name, manufactured by Lanxess): 2.0 parts by mass Incidentally, Hytemp AR212XP contains, as a polymer composition,
• a rubber composition was prepared in the same manner as in Example 1, except that the above rubber composition was used, and a cured product was obtained and evaluated. The results are shown in Table 6.
• Example 7 A rubber composition was prepared in the same manner as in Example 12, except that silica and polyorganosiloxane were not blended, and 60 parts by mass of carbon black (FEF) (trade name: SEAST SO, manufactured by Tokai Carbon Co., Ltd.) was blended instead. A cured product was obtained and evaluated. The results are shown in Table 6.
• Example 13 A rubber composition was prepared by mixing the following components.
• a rubber composition was prepared in the same manner as in Example 1, except that the above rubber composition was used, and a cured product was obtained and evaluated. The results are shown in Table 6.

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