WO2012133478A1 - タイヤ用ゴム組成物及び空気入りタイヤ - Google Patents
タイヤ用ゴム組成物及び空気入りタイヤ Download PDFInfo
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- WO2012133478A1 WO2012133478A1 PCT/JP2012/058052 JP2012058052W WO2012133478A1 WO 2012133478 A1 WO2012133478 A1 WO 2012133478A1 JP 2012058052 W JP2012058052 W JP 2012058052W WO 2012133478 A1 WO2012133478 A1 WO 2012133478A1
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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
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0016—Compositions of the tread
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08C19/00—Chemical modification of rubber
- C08C19/30—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule
- C08C19/42—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule reacting with metals or metal-containing groups
- C08C19/44—Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule reacting with metals or metal-containing groups of polymers containing metal atoms exclusively at one or both ends of the skeleton
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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
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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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
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/548—Silicon-containing compounds containing sulfur
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Definitions
- the present invention relates to a rubber composition for tires and a pneumatic tire using the same.
- silica has hydrophilic silanol groups on its surface, it has lower affinity with rubber (especially natural rubber, butadiene rubber, styrene butadiene rubber, etc. often used for tires) and wear resistance compared to carbon black. And mechanical strength (tensile strength and elongation at break).
- Patent Document 1 discloses a rubber composition for tires that can significantly improve wet grip performance by containing both anhydrous silica and hydrous silica. However, there is room for improvement in terms of improving fuel economy and wear resistance as well as wet grip performance.
- An object of the present invention is to solve the above problems and provide a rubber composition for a tire that can improve fuel efficiency, wet grip performance, and wear resistance, and a pneumatic tire using the same.
- the present invention includes the following general formula: (Wherein R 0 represents hydrogen, an aliphatic hydrocarbon group having 1 to 30 carbon atoms, an alicyclic hydrocarbon group having 3 to 30 carbon atoms, or an aromatic hydrocarbon group having 5 to 30 carbon atoms. R 1 And R 2 are the same or different and are hydrogen, Or And at least one of R 1 and R 2 is not hydrogen. R 3 represents hydrogen or a hydrocarbon group having 1 to 4 carbon atoms.
- X represents a divalent saturated hydrocarbon group and may contain nitrogen, oxygen or sulfur; Or May be substituted.
- Z represents a divalent saturated hydrocarbon group and may contain nitrogen, oxygen or sulfur.
- R 4 to R 7 are the same or different and each represents hydrogen, an aliphatic hydrocarbon group having 1 to 30 carbon atoms, an alicyclic hydrocarbon group having 3 to 30 carbon atoms, or an aromatic hydrocarbon group having 5 to 30 carbon atoms. Or a heterocyclic group having 3 to 30 ring atoms.
- R 21 is —O— (R 25 —O) t —R 26 (t R 25 is the same or different and is a divalent divalent having 1 to 30 carbon atoms, which is branched or unbranched).
- R 26 represents a branched or unbranched alkyl group having 1 to 30 carbon atoms, a branched or unbranched alkenyl group having 2 to 30 carbon atoms, an aryl group having 6 to 30 carbon atoms, or 7 carbon atoms.
- R 22 and R 23 are the same or different and are the same as R 21 , branched or unbranched.
- R 27 is a hydrogen atom, a branched or unbranched alkyl group having 1 to 30 carbon atoms, a branched or unbranched alkenyl group having 2 to 30 carbon atoms, C6-C30 aryl group or C7-C30 Represents an aralkyl group.
- R 24 represents a group represented by represents a branched or unbranched alkylene group having 1 to 30 carbon atoms.
- x is an integer of 0 or more
- y is an integer of 1 or more
- R 28 is hydrogen, halogen, a branched or unbranched alkyl group having 1 to 30 carbon atoms, or
- the content of the modified styrene butadiene rubber in 100% by mass of the rubber component is preferably 5% by mass or more.
- the modified styrene butadiene rubber is preferably a polymer modified at least at one end with a modifier having a functional group containing at least one selected from the group consisting of nitrogen, oxygen and silicon. .
- the rubber composition is preferably used for a tread.
- the present invention also relates to a pneumatic tire produced using the rubber composition.
- the present invention since it is a rubber composition containing a specific modified styrene butadiene rubber, silica and a specific silane coupling agent, low fuel consumption, wet grip performance, and wear resistance can be improved.
- the rubber composition of the present invention has the following general formula: (Wherein R 0 represents hydrogen, an aliphatic hydrocarbon group having 1 to 30 carbon atoms, an alicyclic hydrocarbon group having 3 to 30 carbon atoms, or an aromatic hydrocarbon group having 5 to 30 carbon atoms. R 1 And R 2 are the same or different and are hydrogen, Or And at least one of R 1 and R 2 is not hydrogen. R 3 represents hydrogen or a hydrocarbon group having 1 to 4 carbon atoms.
- X represents a divalent saturated hydrocarbon group and may contain nitrogen, oxygen or sulfur; Or May be substituted.
- Z represents a divalent saturated hydrocarbon group and may contain nitrogen, oxygen or sulfur.
- R 4 to R 7 are the same or different and each represents hydrogen, an aliphatic hydrocarbon group having 1 to 30 carbon atoms, an alicyclic hydrocarbon group having 3 to 30 carbon atoms, or an aromatic hydrocarbon group having 5 to 30 carbon atoms. Or a heterocyclic group having 3 to 30 ring atoms.
- modified SBR modified styrene butadiene rubber
- R 21 is —O— (R 25 —O) t —R 26 (t R 25 is the same or different and is a divalent divalent having 1 to 30 carbon atoms, which is branched or unbranched).
- R 26 represents a branched or unbranched alkyl group having 1 to 30 carbon atoms, a branched or unbranched alkenyl group having 2 to 30 carbon atoms, an aryl group having 6 to 30 carbon atoms, or 7 carbon atoms.
- R 22 and R 23 are the same or different and are the same as R 21 , branched or unbranched.
- R 27 is a hydrogen atom, a branched or unbranched alkyl group having 1 to 30 carbon atoms, a branched or unbranched alkenyl group having 2 to 30 carbon atoms, C6-C30 aryl group or C7-C30 Represents an aralkyl group.
- R 24 represents a group represented by represents a branched or unbranched alkylene group having 1 to 30 carbon atoms.
- x is an integer of 0 or more
- y is an integer of 1 or more
- R 28 is hydrogen, halogen, a branched or unbranched alkyl group having 1 to 30 carbon atoms, or
- silica can be dispersed well, low fuel consumption and wear resistance can be achieved, and excellent wet grip performance can be obtained.
- the fuel economy and wear resistance are remarkably improved, and both performances are excellent, giving consideration to the environment.
- excellent handling stability can be obtained. Good dry grip performance, mechanical strength, and workability.
- modified SBR for example, those described in JP 2010-116545 A and JP 2010-116546 A can be used.
- Examples of the form in which the saturated hydrocarbon group represented by X contains nitrogen, oxygen or sulfur include (CR 10 R 11 ) m —NR 12 — (CR 13 R 14 ) n , (CR 10 R 11 ) m ⁇ . O— (CR 13 R 14 ) n , (CR 10 R 11 ) m —S— (CR 13 R 14 ) n and the like can be mentioned.
- R 10 to R 14 are the same or different and are each hydrogen, an aliphatic hydrocarbon group having 1 to 30 carbon atoms (preferably 1 to 5), or an alicyclic carbon group having 3 to 30 carbon atoms (preferably 3 to 10 carbon atoms). It represents a hydrogen group or an aromatic hydrocarbon group having 5 to 30 carbon atoms (preferably 5 to 10).
- n each represents an integer of 1 to 9 (preferably 1 to 6).
- m 2 or more
- n 2 or more
- each of the plurality of (CR 13 R 14 ) is the same. May be different.
- the saturated hydrocarbon group represented by Z contains nitrogen, oxygen or sulfur
- the same as the saturated hydrocarbon group represented by X can be mentioned.
- R 0 is preferably hydrogen or an aliphatic hydrocarbon group having 1 to 2 carbon atoms from the viewpoint that silica can be more favorably dispersed.
- R 3 is preferably hydrogen or a hydrocarbon group having 1 to 2 carbon atoms.
- R 4 to R 7 are preferably an aliphatic hydrocarbon group, an aromatic hydrocarbon group or a heterocyclic group, and more preferably an aliphatic hydrocarbon group.
- R 10 to R 14 are preferably hydrogen or an aliphatic hydrocarbon group having 1 to 2 carbon atoms.
- the modified SBR is a copolymer obtained by copolymerizing styrene, butadiene (1,3-butadiene) and a nitrogen-containing compound (monomer) represented by the above general formula, and is derived from the nitrogen-containing compound.
- the structural unit to be included is included in the main chain portion.
- the main chain part is a concept including a terminal part.
- Examples of the nitrogen-containing compound represented by the above general formula include 3- or 4- (2-azetidinoethyl) styrene, 3- or 4- (2-pyrrolidinoethyl) styrene, 3- or 4- (2-piperidinoethyl). ) Styrene, 3- or 4- (2-hexamethyleneiminoethyl) styrene, and the like. These may be used alone or in combination of two or more. Among these, 3- or 4- (2-pyrrolidinoethyl) styrene is preferable from the viewpoint that silica can be dispersed more favorably.
- At least one terminal is preferably modified with a modifying agent having a functional group containing at least one selected from the group consisting of nitrogen, oxygen, and silicon, and both terminals are the modifying agent. More preferably, it is denatured. Thereby, the improvement effect of each performance can be heightened.
- Examples of the functional group possessed by the modifier include amino group, amide group, alkoxysilyl group, isocyanate group, imino group, imidazole group, urea group, ether group, carbonyl group, carboxyl group, hydroxyl group, nitrile group, and pyridyl. Group, and the like, preferably an amino group and an alkoxysilyl group.
- Examples of the modifier include 3- (N, N-dimethylamino) propyltrimethoxysilane, 3- (N, N-diethylaminopropyl) trimethoxysilane, and 3- (N, N-dimethylamino) propyl.
- the content of the nitrogen-containing compound in the modified SBR is preferably 0.05% by mass or more, more preferably 0.1% by mass or more. If it is less than 0.05% by mass, there is a tendency that it is difficult to obtain an effect of improving fuel efficiency and wet grip performance.
- the content of the nitrogen-containing compound in the modified SBR is preferably 30% by mass or less, more preferably 20% by mass or less, and still more preferably 5% by mass or less. When it exceeds 30 mass%, there exists a tendency for the effect corresponding to the increase in cost not to be acquired.
- content of a nitrogen-containing compound is measured by the method as described in the below-mentioned Example.
- the weight average molecular weight Mw of the modified SBR is preferably 1.0 ⁇ 10 5 or more, more preferably 2.0 ⁇ 10 5 or more. If it is less than 1.0 ⁇ 10 5 , fuel economy and wear resistance tend to deteriorate.
- the Mw is preferably 2.0 ⁇ 10 6 or less, more preferably 1.5 ⁇ 10 6 or less. When it exceeds 2.0 ⁇ 10 6 , workability tends to deteriorate.
- a weight average molecular weight (Mw) is measured by the method as described in the below-mentioned Example.
- the content of the modified SBR is preferably 5% by mass or more, more preferably 10% by mass or more, and still more preferably 20% by mass or more, in 100% by mass of the rubber component. If it is less than 5% by mass, the fuel efficiency may not be improved. Although an upper limit is not specifically limited, Preferably it is 90 mass% or less, More preferably, it is 80 mass% or less, More preferably, it is 75 mass% or less. When it exceeds 90% by mass, the fracture strength tends to be extremely deteriorated.
- a diene rubber as the rubber component of the rubber composition in addition to the modified SBR.
- the diene rubber is composed of natural rubber and / or diene synthetic rubber.
- examples of the diene rubber include isoprene rubber (IR), butadiene rubber (BR), styrene butadiene rubber (SBR), and acrylonitrile butadiene rubber (NBR). ), Chloroprene rubber (CR), butyl rubber (IIR) and the like.
- IR isoprene rubber
- BR butadiene rubber
- SBR styrene butadiene rubber
- NBR acrylonitrile butadiene rubber
- CR Chloroprene rubber
- IIR butyl rubber
- NR, BR, and SBR are preferable because grip performance and wear resistance are well-balanced.
- the content of NR in 100% by mass of the rubber component is preferably 10% by mass or more, more preferably 20% by mass or more. If it is less than 10% by mass, the effect of blending NR tends to be insufficient.
- the content of NR is preferably 70% by mass or less, more preferably 50% by mass or less. If it exceeds 70% by mass, the content of the modified SBR will decrease, and the dispersibility of silica will tend to deteriorate.
- silica is blended as a reinforcing agent.
- a silica A dry process silica (anhydrous silicic acid), a wet process silica (hydrous silicic acid), etc. are mentioned, The wet process silica is preferable from the reason that there are many silanol groups.
- Silica may be used alone or in combination of two or more.
- the nitrogen adsorption specific surface area (N 2 SA) of silica is preferably 100 m 2 / g or more, more preferably 150 m 2 / g or more. If it is less than 100 m 2 / g, the reinforcing effect is small and the wear resistance tends to deteriorate. Further, N 2 SA of silica is preferably 300 m 2 / g or less, more preferably 200 m 2 / g or less. When it exceeds 300 m ⁇ 2 > / g, it will become difficult to disperse
- the content of silica is preferably 10 parts by mass or more, more preferably 20 parts by mass or more, and still more preferably 50 parts by mass or more with respect to 100 parts by mass of the rubber component. If it is less than 10 parts by mass, sufficient wet grip performance and wear resistance may not be obtained. Further, the content of silica is preferably 150 parts by mass or less, more preferably 120 parts by mass or less. When it exceeds 150 parts by mass, silica is difficult to disperse, and processability and fuel efficiency tend to deteriorate.
- the rubber composition of the present invention comprises a silane coupling agent represented by the following formula (1) and / or a silane comprising a bonding unit A represented by the following formula (2) and a bonding unit B represented by the following formula (3).
- a coupling agent represented by the following formula (1)
- R 21 is —O— (R 25 —O) t —R 26
- t R 25 is the same or different and is a divalent divalent having 1 to 30 carbon atoms, which is branched or unbranched).
- R 26 represents a branched or unbranched alkyl group having 1 to 30 carbon atoms, a branched or unbranched alkenyl group having 2 to 30 carbon atoms, an aryl group having 6 to 30 carbon atoms, or 7 carbon atoms.
- R 27 is a hydrogen atom, a branched or unbranched alkyl group having 1 to 30 carbon atoms, a branched or unbranched alkenyl group having 2 to 30 carbon atoms, C6-C30 aryl group or C7-C30 Represents an aralkyl group.
- R 24 represents a group represented by represents a branched or unbranched alkylene group having 1 to 30 carbon atoms.
- x is an integer of 0 or more
- y is an integer of 1 or more
- R 28 is hydrogen, halogen, a branched or unbranched alkyl group having 1 to 30 carbon atoms, or
- silane coupling agent represented by the above formula (1) By blending the silane coupling agent represented by the above formula (1), excellent fuel efficiency can be obtained and grip performance can be obtained well.
- R 21 in the above formula (1) is —O— (R 25 —O) t —R 26 (t R 25 s are the same or different and are branched or unbranched divalent carbon atoms having 1 to 30 carbon atoms.
- R 26 represents a branched or unbranched alkyl group having 1 to 30 carbon atoms, a branched or unbranched alkenyl group having 2 to 30 carbon atoms, an aryl group having 6 to 30 carbon atoms, or 7 to 7 carbon atoms.
- t represents an integer of 1 to 30).
- R 25 is the same or different and represents a branched or unbranched divalent hydrocarbon group having 1 to 30 carbon atoms (preferably 1 to 10 carbon atoms, more preferably 1 to 3 carbon atoms).
- the hydrocarbon group include a branched or unbranched alkylene group having 1 to 30 carbon atoms, a branched or unbranched alkenylene group having 2 to 30 carbon atoms, and a branched or unbranched alkynylene group having 2 to 30 carbon atoms.
- an arylene group having 6 to 30 carbon atoms is preferable because it easily bonds (reacts) with silica and can sufficiently improve fuel efficiency and wear resistance.
- Examples of the branched or unbranched alkylene group having 1 to 30 carbon atoms (preferably 1 to 10 carbon atoms, more preferably 1 to 3 carbon atoms) of R 25 include, for example, a methylene group, an ethylene group, a propylene group, and a butylene group. Pentylene group, hexylene group, heptylene group, octylene group, nonylene group, decylene group, undecylene group, dodecylene group, tridecylene group, tetradecylene group, pentadecylene group, hexadecylene group, heptadecylene group, octadecylene group and the like.
- Examples of the branched or unbranched C 2-30 alkenylene group of R 25 include, for example, vinylene group, 1-propenylene group, 2-propenylene group. Group, 1-butenylene group, 2-butenylene group, 1-pentenylene group, 2-pentenylene group, 1-hexenylene group, 2-hexenylene group, 1-octenylene group and the like.
- R 25 branched or unbranched alkynylene groups having 2 to 30 carbon atoms include, for example, ethynylene group, propynylene group, butynylene group and pentynylene group. Hexynylene group, heptynylene group, octynylene group, noninylene group, decynylene group, undecynylene group, dodecynylene group and the like.
- Examples of the arylene group having 6 to 30 carbon atoms (preferably 6 to 15 carbon atoms) of R 25 include a phenylene group, a tolylene group, a xylylene group, and a naphthylene group.
- T represents an integer of 1 to 30 (preferably 2 to 20, more preferably 5 to 6).
- t is 0, the bond (reaction) with silica is disadvantageous, and when t is 31 or more, the reactivity with silica is lowered, which is disadvantageous in terms of process.
- R 26 represents a branched or unbranched alkyl group having 1 to 30 carbon atoms, a branched or unbranched alkenyl group having 2 to 30 carbon atoms, an aryl group having 6 to 30 carbon atoms, or an aralkyl group having 7 to 30 carbon atoms.
- branched or unbranched alkyl groups having 1 to 30 carbon atoms are preferred because of their good reactivity with silica.
- Examples of the branched or unbranched alkyl group of 1 to 30 carbon atoms (preferably 3 to 25 carbon atoms, more preferably 10 to 15 carbon atoms) of R 26 include, for example, a methyl group, an ethyl group, an n-propyl group, Isopropyl, n-butyl, iso-butyl, sec-butyl, tert-butyl, pentyl, hexyl, heptyl, 2-ethylhexyl, octyl, nonyl, decyl, undecyl , Dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, octadecyl group and the like.
- R 26 branched or unbranched alkenyl groups having 2 to 30 carbon atoms include, for example, vinyl group, 1-propenyl group, 2-propenyl group.
- Examples of the aryl group of 6 to 30 carbon atoms (preferably 10 to 20 carbon atoms) of R 26 include a phenyl group, a tolyl group, a xylyl group, a naphthyl group, and a biphenyl group.
- Examples of the aralkyl group having 7 to 30 carbon atoms (preferably 10 to 20 carbon atoms) of R 26 include a benzyl group and a phenethyl group.
- R 21 in the above formula (1) include, for example, —O— (C 2 H 4 —O) 5 —C 11 H 23 , —O— (C 2 H 4 —O) 5 —C 12 H. 25 , —O— (C 2 H 4 —O) 5 —C 13 H 27 , —O— (C 2 H 4 —O) 5 —C 14 H 29 , —O— (C 2 H 4 —O) 5 —C 15 H 31 , —O— (C 2 H 4 —O) 3 —C 13 H 27 , —O— (C 2 H 4 —O) 4 —C 13 H 27 , —O— (C 2 H 4 -O) 6 -C 13 H 27 , -O- (C 2 H 4 -O) 7 -C 13 H 27, and the like.
- —O— (C 2 H 4 —O) 5 —C 11 H 23 , —O— (C 2 H 4 —O) 5 —C 13 H 27 , —O— (C 2 H 4 —O) 5- C 15 H 31 and -O- (C 2 H 4 -O) 6 -C 13 H 27 are preferred.
- R 22 and R 23 are the same or different and are the same as R 21 (that is, a group represented by —O— (R 25 —O) t —R 26 ), branched or unbranched carbon atoms of 1 to 12 alkyl groups or —O—R 27 (R 27 is a hydrogen atom, a branched or unbranched alkyl group having 1 to 30 carbon atoms, a branched or unbranched alkenyl group having 2 to 30 carbon atoms, or a C 6-30 group. An aryl group or an aralkyl group having 7 to 30 carbon atoms). In particular, because of its good reactivity with silica, it is represented by the same group as R 21 , —O—R 27 (when R 27 is a branched or unbranched C 1-30 alkyl group). Preferred are the groups
- Examples of the branched or unbranched alkyl group having 1 to 12 carbon atoms (preferably 1 to 10 carbon atoms, more preferably 1 to 8 carbon atoms) of R 22 and R 23 include, for example, methyl group, ethyl group, n- Propyl group, isopropyl group, n-butyl group, iso-butyl group, sec-butyl group, tert-butyl group, pentyl group, hexyl group, heptyl group, 2-ethylhexyl group, octyl group, nonyl group, etc. It is done.
- Branched or unbranched 1 to 30 carbon atoms of R 27 (preferably 1 to 10 carbon atoms, more preferably 3 1 carbon atoms)
- alkyl group for example, the number of carbon atoms of branched or unbranched the R 26
- examples thereof include the same groups as 1 to 30 alkyl groups.
- Branched or unbranched carbon atoms 2 to 30 R 27 (preferably 2 to 10 carbon atoms, more preferably 2 to 5 carbon atoms)
- alkenyl group for example, the number of carbon atoms of branched or unbranched the R 26
- examples thereof include the same groups as 2 to 30 alkenyl groups.
- Examples of the aryl group of 6 to 30 carbon atoms (preferably 6 to 12 carbon atoms) of R 27 include the same groups as the aryl groups of 6 to 30 carbon atoms of R 26 described above.
- Examples of the aralkyl group having 7 to 30 carbon atoms (preferably 7 to 13 carbon atoms) for R 27 include the same groups as the aralkyl groups having 7 to 30 carbon atoms for R 26 .
- R 22 and R 23 in the above formula (1) include, for example, —O— (C 2 H 4 —O) 5 —C 11 H 23 , —O— (C 2 H 4 —O) 5 —.
- —O— (C 2 H 4 —O) 5 —C 11 H 23 , —O— (C 2 H 4 —O) 5 —C 13 H 27 , —O— (C 2 H 4 —O) 5- C 15 H 31 , —O— (C 2 H 4 —O) 6 —C 13 H 27 , and C 2 H 5 —O— are preferable.
- silane coupling agent represented by the above formula (1) for example, Si363 manufactured by Degussa can be used. These may be used alone or in combination of two or more.
- a bis (3-triethoxysilylpropyl) is obtained by blending a silane coupling agent composed of a binding unit B represented by the above formula (3) and a coupling unit A represented by the above formula (2) as necessary. ) Low fuel consumption and wear resistance can be improved compared to conventional silane coupling agents such as tetrasulfide.
- the silane coupling agent composed of the binding unit A and the binding unit B is preferably a copolymer obtained by copolymerizing the binding unit B at a ratio of 1 to 70 mol% with respect to the total amount of the binding unit A and the binding unit B.
- the shortening of the scorch time is suppressed as compared with mercaptosilane such as 3-mercaptopropyltrimethoxysilane.
- the bond unit B has a mercaptosilane structure, but the —C 7 H 15 portion of the bond unit A covers the —SH group of the bond unit B, so that it does not easily react with the polymer and scorch is not easily generated. Conceivable.
- halogen for R 28 examples include chlorine, bromine and fluorine.
- Examples of the branched or unbranched alkyl group having 1 to 30 carbon atoms (preferably 1 to 12 carbon atoms, more preferably 1 to 5 carbon atoms) of R 28 and R 29 include, for example, the branched or unbranched groups of R 26 described above. And the same groups as the alkyl group having 1 to 30 carbon atoms.
- Examples of the branched or unbranched alkylene group having 1 to 30 carbon atoms (preferably 1 to 12 carbon atoms) of R 28 and R 29 include, for example, the branched or unbranched alkylene group having 1 to 30 carbon atoms of R 25 described above. The same group can be mentioned.
- Examples of the branched or unbranched alkenyl group having 2 to 30 carbon atoms (preferably 2 to 12 carbon atoms) of R 28 and R 29 include, for example, the branched or unbranched alkenyl group having 2 to 30 carbon atoms of R 26. The same group can be mentioned.
- Examples of the branched or unbranched alkenylene group having 2 to 30 carbon atoms (preferably 2 to 12 carbon atoms) of R 28 and R 29 include, for example, the branched or unbranched alkenylene group having 2 to 30 carbon atoms of R 25. The same group can be mentioned.
- Examples of the branched or unbranched alkynyl group having 2 to 30 carbon atoms (preferably 2 to 12 carbon atoms) of R 28 and R 29 include, for example, ethynyl group, propynyl group, butynyl group, pentynyl group, hexynyl group, heptynyl Group, octynyl group, noninyl group, decynyl group, undecynyl group, dodecynyl group and the like.
- Examples of the branched or unbranched alkynylene group having 2 to 30 carbon atoms (preferably 2 to 12 carbon atoms) of R 28 and R 29 include, for example, the branched or unbranched alkynylene group having 2 to 30 carbon atoms of R 25. The same group can be mentioned.
- the total number of repetitions (x + y) of the repeating number (x) of the bonding unit A and the repeating number (y) of the bonding unit B ranges from 3 to 300. Is preferred. Within this range and when x is 1 or more, since the mercaptosilane of the bond unit B is covered with —C 7 H 15 of the bond unit A, it is possible to prevent the scorch time from being shortened, and to use silica and rubber components. And good reactivity can be ensured.
- NXT-Z30, NXT-Z45, NXT-Z60, or NXT-Z100 manufactured by Momentive can be used as the silane coupling agent composed of the binding unit A and the binding unit B. These may be used alone or in combination of two or more.
- the content of the silane coupling agent is preferably 3 parts by mass or more, more preferably 6 parts by mass or more, and still more preferably 8 parts by mass or more with respect to 100 parts by mass of silica. If it is less than 3 mass parts, there exists a tendency for a fracture strength to fall large. Moreover, the content of the silane coupling agent is preferably 15 parts by mass or less, more preferably 10 parts by mass or less. When it exceeds 15 parts by mass, there is a tendency that effects such as an increase in fracture strength and a reduction in rolling resistance due to the addition of the silane coupling agent cannot be obtained. In addition, when using together 2 or more types of silane coupling agents, the said content means total content.
- the rubber composition of the present invention includes compounding agents generally used in the production of rubber compositions, for example, reinforcing fillers such as carbon black and clay, anti-aging agents, zinc oxide, and stearic acid. Further, processing aids such as oil, wax and polyethylene glycol, vulcanizing agents such as sulfur, vulcanization accelerators and the like can be appropriately blended.
- the nitrogen adsorption specific surface area (N 2 SA) of carbon black is preferably 30 m 2 / g or more, more preferably 90 m 2 / g or more. If it is less than 30 m ⁇ 2 > / g, there exists a tendency for sufficient reinforcement and abrasion resistance not to be obtained. Also, N 2 SA of carbon black is preferably 180 m 2 / g or less, and more preferably not more than 130m 2 / g. If it exceeds 180 m 2 / g, the dispersibility tends to deteriorate and the exothermicity tends to increase.
- the N 2 SA of carbon black is obtained according to JIS K 6217-2: 2001.
- the content of carbon black is preferably 2 parts by mass or more, more preferably 5 parts by mass or more with respect to 100 parts by mass of the rubber component. Moreover, this content becomes like this. Preferably it is 20 mass parts or less, More preferably, it is 15 mass parts or less. If it is less than 2 parts by mass, the workability tends to deteriorate. On the other hand, when it exceeds 20 parts by mass, wet grip properties and low heat build-up tend to be deteriorated.
- the total content of silica and carbon black is preferably 20 parts by mass or more, more preferably 60 parts by mass or more with respect to 100 parts by mass of the rubber component. If the amount is less than 20 parts by mass, sufficient fuel economy, wet grip performance, and wear resistance may not be obtained.
- the total content is preferably 160 parts by mass or less, more preferably 120 parts by mass or less. If it exceeds 160 parts by mass, the fuel efficiency tends to deteriorate.
- the content of silica in a total of 100% by mass of silica and carbon black is preferably 30% by mass or more, more preferably 60% by mass or more, still more preferably 80% by mass or more, and preferably 95% by mass or less. Preferably it is 90 mass% or less. If it is in the said range, the effect of this invention will be acquired suitably.
- process oil for example, process oil, vegetable oil, or a mixture thereof can be used.
- process oil for example, a paraffin process oil, an aroma process oil, a naphthenic process oil, or the like can be used.
- vegetable oils and fats castor oil, cottonseed oil, sesame oil, rapeseed oil, soybean oil, palm oil, palm oil, peanut hot water, rosin, pine oil, pineapple, tall oil, corn oil, rice bran oil, beet flower oil, sesame oil, Examples include olive oil, sunflower oil, palm kernel oil, camellia oil, jojoba oil, macadamia nut oil, and tung oil.
- the oil content is preferably 5 parts by mass or more, and more preferably 15 parts by mass or more with respect to 100 parts by mass of the rubber component. If it is less than 5 parts by mass, sufficient grip performance may not be obtained.
- the oil content is preferably 30 parts by mass or less, more preferably 25 parts by mass or less. When it exceeds 30 mass parts, there exists a possibility that low-fuel-consumption property and abrasion resistance may deteriorate.
- the rubber composition of the present invention is produced by a general method. That is, it can be produced by a method of kneading the above components with a Banbury mixer, kneader, open roll or the like and then vulcanizing.
- the rubber composition of the present invention can be used for each member of a tire, and in particular, can be suitably used for a tread (particularly a cap tread).
- the pneumatic tire of the present invention is produced by a usual method using the rubber composition. That is, by extruding the rubber composition containing the above components in accordance with the shape of a tread or the like at an unvulcanized stage, and molding it on a tire molding machine together with other tire members, Form an unvulcanized tire.
- the unvulcanized tire is heated and pressurized in a vulcanizer to obtain a tire.
- the pneumatic tire of the present invention is suitably used as a tire for passenger cars.
- the nitrogen-containing compound derivative monomer amount (monomer (1) amount) in the polymer was measured using a device of JNM-ECA series manufactured by JEOL Ltd.
- SBR E15 manufactured by Asahi Kasei Chemicals Corporation Polymer (1): Main chain modified SBR (manufactured in Production Example 2, Mw: 3.0 ⁇ 10 5 , monomer (1) amount: 1.0 mass%)
- NR RSS # 3
- Anti-aging agent (1) Antigen 6C (N- (1,3-dimethylbutyl) -N′-phenyl-p-phenylenediamine) manufactured by Sumitomo Chemical Co., Ltd.
- Anti-aging agent (2) Antigen 3C manufactured by Sumitomo Chemical Co., Ltd.
- Wax Sunnock N manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.
- Oil (1) Process X-140 manufactured by Japan Energy Co., Ltd.
- Oil (2) Diana Process Oil AH-25 manufactured by Idemitsu Kosan Co., Ltd.
- Sulfur Powder sulfur vulcanization accelerator manufactured by Karuizawa Sulfur Co., Ltd.
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- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Tires In General (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Description
本発明はまた、前記ゴム組成物を用いて作製した空気入りタイヤに関する。
なお、本明細書において、窒素含有化合物の含有量は、後述の実施例に記載の方法により測定される。
なお、本明細書において、重量平均分子量(Mw)は、後述の実施例に記載の方法により測定される。
なお、シリカのN2SAは、ASTM D3037-81に準じてBET法で測定される。
該炭化水素基としては、例えば、分岐若しくは非分岐の炭素数1~30のアルキレン基、分岐若しくは非分岐の炭素数2~30のアルケニレン基、分岐若しくは非分岐の炭素数2~30のアルキニレン基、炭素数6~30のアリーレン基などが挙げられる。なかでも、シリカと結合(反応)しやすく、低燃費性、耐摩耗性を十分に向上できるという理由から、上記アルキレン基が好ましい。
なお、2種以上のシランカップリング剤を併用する場合には、上記含有量は、合計含有量を意味する。
なお、カーボンブラックのN2SAは、JIS K 6217-2:2001によって求められる。
シクロへキサン:関東化学(株)製
ピロリジン:関東化学(株)製
ジビニルベンゼン:シグマアルドリッチ社製
1.6M n-ブチルリチウムへキサン溶液:関東化学(株)製
イソプロパノール:関東化学(株)製
十分に窒素置換した100ml容器に、シクロへキサン50ml、ピロリジン4.1ml(3.6g)、ジビニルベンゼン6.5gを加え、0℃にて1.6M n-ブチルリチウムヘキサン溶液0.7mlを加えて撹拌した。
1時間後、イソプロパノールを加えて反応を停止させ、抽出・精製を行うことでモノマー(1)を得た。
シクロヘキサン:関東化学(株)製
スチレン:関東化学(株)製
ブタジエン:高千穂化学工業(株)製
テトラメチルエチレンジアミン:関東化学(株)製
1.6M n-ブチルリチウムへキサン溶液:関東化学(株)製
末端変性剤:アヅマックス社製の3-(N,N-ジメチルアミノプロピル)トリメトキシシラン
イソプロパノール:関東化学(株)製
十分に窒素置換した1000ml耐圧製容器に、シクロヘキサン600ml、スチレン12.6ml(11.4g)、ブタジエン71.0ml(41.0g)、モノマー(1)0.29g、テトラメチルエチレンジアミン0.11mlを加え、40℃で1.6M n-ブチルリチウムヘキサン溶液0.2mlを加えて撹拌した。
3時間後、イソプロパノール3mlを加えて重合を停止させた。反応溶液に2,6-tert-ブチル-p-クレゾール1gを添加後、メタノールで再沈殿処理を行い、加熱乾燥させて重合体(1)を得た。
十分に窒素置換した1000ml耐圧製容器に、シクロヘキサン600ml、スチレン12.6ml(11.4g)、ブタジエン71.0ml(41.0g)、モノマー(1)0.29g、テトラメチルエチレンジアミン0.11mlを加え、40℃で1.6M n-ブチルリチウムヘキサン溶液0.2mlを加えて撹拌した。
3時間後、3-(N,N-ジメチルアミノプロピル)トリメトキシシラン(変性剤)を0.5ml(0.49g)加えて撹拌した。
1時間後、イソプロパノール3mlを加えて重合を停止させた。反応溶液に2,6-tert-ブチル-p-クレゾール1gを添加後、メタノールで再沈殿処理を行い、加熱乾燥させて重合体(2)を得た。
重量平均分子量Mwは、東ソー(株)製GPC-8000シリーズの装置を用い、検知器として示差屈折計を用い、分子量は標準ポリスチレンにより校正した。
重合体中の窒素含有化合物誘導体モノマー量(モノマー(1)量)は、日本電子(株)製JNM-ECAシリーズの装置を用いて測定した。
SBR:旭化成ケミカルズ(株)製のE15
重合体(1):主鎖変性SBR(製造例2にて製造、Mw:3.0×105、モノマー(1)量:1.0質量%)
重合体(2):主鎖及び末端変性SBR(製造例3にて製造、Mw:3.0×105、モノマー(1)量:1.0質量%)
NR:RSS#3
シリカ:デグッサ社製のULTRASIL VN3(N2SA:175m2/g)
カーボンブラック:三菱化学(株)製のダイアブラックN220(N2SA:114m2/g)
シランカップリング剤(1):デグッサ社製のSi69(ビス(3-トリエトキシシリルプロピル)テトラスルフィド)
シランカップリング剤(2):Momentive社製のNXT-Z45(結合単位Aと結合単位Bとの共重合体、結合単位A:55モル%、結合単位B:45モル%)
シランカップリング剤(3):デグッサ社製のSi75(ビス(3-トリエトキシシリルプロピル)ジスルフィド)
シランカップリング剤(4):デグッサ社製のSi363(下記式で表されるシランカップリング剤(上記式(1)のR21=-O-(C2H4-O)5-C13H27、R22=C2H5-O-、R23=-O-(C2H4-O)5-C13H27、R24=-C3H6-))
ステアリン酸:日油(株)製のステアリン酸「椿」
老化防止剤(1):住友化学(株)製のアンチゲン6C(N-(1,3-ジメチルブチル)-N’-フェニル-p-フェニレンジアミン)
老化防止剤(2):住友化学(株)製のアンチゲン3C
ワックス:大内新興化学工業(株)製のサンノックN
オイル(1):(株)ジャパンエナジー製のプロセスX-140
オイル(2):出光興産(株)製のダイアナプロセスオイルAH-25
硫黄:軽井沢硫黄(株)製の粉末硫黄
加硫促進剤(1):大内新興化学工業(株)製のノクセラーCZ(N-シクロへキシル-2-ベンゾチアゾリルスルフェンアミド)
加硫促進剤(2):大内新興化学工業(株)製のノクセラーD(N,N’-ジフェニルグアニジン)
加硫促進剤(3):住友化学(株)製のソクシノールCZ
加硫促進剤(4):住友化学(株)製のソクシノールD
表1、2に示す配合内容に従い、バンバリーミキサーを用いて、硫黄及び加硫促進剤以外の材料を150℃の条件下で3分間混練りし、混練り物を得た。次に、得られた混練り物に硫黄、加硫促進剤及び架橋剤を添加し、オープンロールを用いて、50℃の条件下で5分間練り込み、未加硫ゴム組成物を得た。得られた未加硫ゴム組成物をトレッドの形状に成形し、他のタイヤ部材と貼り合わせてタイヤに成形し、170℃で10分間加硫することで試験用タイヤ(タイヤサイズ:195/65R15)を製造した。
転がり抵抗試験機を用い、試験用タイヤを、リム(15×6JJ)、内圧(230kPa)、荷重(3.43kN)、速度(80km/h)で走行させたときの転がり抵抗を測定し、下記計算式により指数表示した。指数が大きいほど、転がり抵抗が低く、低燃費性に優れることを示す。
(転がり抵抗指数)=(比較例1、5の転がり抵抗)/(各配合の転がり抵抗)×100
試験用タイヤを装着した車両で湿潤アスファルト路面を走行し、初速度100km/hからの制動距離を測定し、下記計算式により指数表示した。指数が大きいほど、ウェットグリップ性能(ウェットスキッド性能)に優れることを示す。
(ウェットグリップ性能指数)=(比較例1、5の制動距離)/(各配合の制動距離)×100
試験用タイヤを装着した車両で市街地を走行し、8000km走行後の溝探さの減少量から、溝深さが1mm減少するときの走行距離を算出し、下記計算式により指数表示した。指数が大きいほど、耐摩耗性に優れることを示す。
(耐摩耗性指数)=(各配合の走行距離)/(比較例1、5の走行距離)×100
試験用タイヤを装着した普通乗用車を用いて、テストコースで官能試験(ハンドル応答性)を実施し、比較例5を5.5点として相対評価した。点数が高いほど、操縦安定性が良好であることを示す。
Claims (5)
- 下記一般式;
シリカと、
下記式(1)で表されるシランカップリング剤及び/又は下記式(2)で示される結合単位Aと下記式(3)で示される結合単位Bからなるシランカップリング剤とを含有するタイヤ用ゴム組成物。
- 前記ゴム成分100質量%中の前記変性スチレンブタジエンゴムの含有量が5質量%以上である請求項1に記載のタイヤ用ゴム組成物。
- 前記変性スチレンブタジエンゴムは更に、少なくとも一方の末端が、窒素、酸素、ケイ素からなる群より選択される少なくとも1種を含む官能基を有する変性剤で変性された重合体である請求項1又は2に記載のタイヤ用ゴム組成物。
- トレッドに使用される請求項1~3のいずれかに記載のタイヤ用ゴム組成物。
- 請求項1~4のいずれかに記載のゴム組成物を用いて作製した空気入りタイヤ。
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US13/981,026 US20130303683A1 (en) | 2011-03-29 | 2012-03-28 | Rubber composition for use in tires, and pneumatic tire |
CN201280014880.7A CN103459486B (zh) | 2011-03-29 | 2012-03-28 | 轮胎用橡胶组合物和充气轮胎 |
BR112013025255A BR112013025255A2 (pt) | 2011-03-29 | 2012-03-28 | composição de borracha para uso em pneus e pneumático |
EP12765397.0A EP2671915B1 (en) | 2011-03-29 | 2012-03-28 | Rubber composition for use in tires, and pneumatic tire |
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KR101508465B1 (ko) | 2013-10-17 | 2015-04-14 | 주식회사 엘지화학 | 말단 기능성 공액 디엔계 중합체 및 이의 제조방법 |
CN109563196B (zh) * | 2016-07-22 | 2021-07-27 | 公共型股份公司希布尔控股 | 通过阴离子溶液聚合来生产改性橡胶的方法、包含所述橡胶的橡胶组合物及其用途 |
CN107082920A (zh) * | 2017-05-15 | 2017-08-22 | 北京化工大学 | 反应性溶聚丁苯橡胶组合物及其制备方法和硫化橡胶 |
JP6957126B2 (ja) * | 2017-07-19 | 2021-11-02 | コンパニー ゼネラール デ エタブリッスマン ミシュラン | シリコーンオイルに基づくゴム組成物 |
JP2021143235A (ja) * | 2020-03-10 | 2021-09-24 | 住友ゴム工業株式会社 | タイヤトレッド用ゴム組成物、タイヤトレッドおよび乗用車用タイヤ |
US20240158615A1 (en) * | 2022-11-02 | 2024-05-16 | The Goodyear Tire & Rubber Company | Precipitated silica pretreated with a coupling agent and polyethylene glycol for a rubber composition |
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CN103459486B (zh) | 2015-11-25 |
EP2671915B1 (en) | 2016-01-06 |
JP2012207108A (ja) | 2012-10-25 |
EP2671915A4 (en) | 2014-10-15 |
US20130303683A1 (en) | 2013-11-14 |
JP5698050B2 (ja) | 2015-04-08 |
EP2671915A1 (en) | 2013-12-11 |
CN103459486A (zh) | 2013-12-18 |
BR112013025255A2 (pt) | 2017-02-07 |
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