WO2020110940A1 - Composition de caoutchouc pour pneumatique - Google Patents
Composition de caoutchouc pour pneumatique Download PDFInfo
- Publication number
- WO2020110940A1 WO2020110940A1 PCT/JP2019/045802 JP2019045802W WO2020110940A1 WO 2020110940 A1 WO2020110940 A1 WO 2020110940A1 JP 2019045802 W JP2019045802 W JP 2019045802W WO 2020110940 A1 WO2020110940 A1 WO 2020110940A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mass
- rubber
- parts
- tire
- rubber composition
- Prior art date
Links
- 229920001971 elastomer Polymers 0.000 title claims abstract description 92
- 239000005060 rubber Substances 0.000 title claims abstract description 92
- 239000000203 mixture Substances 0.000 title claims abstract description 70
- KAKZBPTYRLMSJV-UHFFFAOYSA-N butadiene group Chemical class C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000005062 Polybutadiene Substances 0.000 claims abstract description 46
- 229920002857 polybutadiene Polymers 0.000 claims abstract description 45
- 239000006229 carbon black Substances 0.000 claims abstract description 29
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 14
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 14
- 229920001194 natural rubber Polymers 0.000 claims abstract description 14
- 238000001179 sorption measurement Methods 0.000 claims abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 150000001412 amines Chemical class 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 10
- 125000000524 functional group Chemical group 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 230000003712 anti-aging effect Effects 0.000 claims description 7
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 7
- 125000003545 alkoxy group Chemical group 0.000 claims description 4
- 125000003368 amide group Chemical group 0.000 claims description 4
- 125000003277 amino group Chemical group 0.000 claims description 4
- 125000003700 epoxy group Chemical group 0.000 claims description 4
- 125000005647 linker group Chemical group 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 abstract description 15
- 239000004615 ingredient Substances 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 31
- 239000000446 fuel Substances 0.000 description 16
- 238000013329 compounding Methods 0.000 description 15
- 239000000377 silicon dioxide Substances 0.000 description 15
- 238000006116 polymerization reaction Methods 0.000 description 14
- 238000012360 testing method Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- 230000009477 glass transition Effects 0.000 description 12
- 230000020169 heat generation Effects 0.000 description 11
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 description 10
- 238000002156 mixing Methods 0.000 description 10
- 239000000945 filler Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 229920003048 styrene butadiene rubber Polymers 0.000 description 8
- 239000003963 antioxidant agent Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 7
- 229920003244 diene elastomer Polymers 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 229920000459 Nitrile rubber Polymers 0.000 description 6
- 230000003078 antioxidant effect Effects 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 5
- 238000004073 vulcanization Methods 0.000 description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 238000002788 crimping Methods 0.000 description 4
- 238000005227 gel permeation chromatography Methods 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 229920002554 vinyl polymer Polymers 0.000 description 4
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 239000011256 inorganic filler Substances 0.000 description 3
- 229910003475 inorganic filler Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- 239000002174 Styrene-butadiene Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- DLNKOYKMWOXYQA-CBAPKCEASA-N (-)-norephedrine Chemical compound C[C@H](N)[C@H](O)C1=CC=CC=C1 DLNKOYKMWOXYQA-CBAPKCEASA-N 0.000 description 1
- ZNRLMGFXSPUZNR-UHFFFAOYSA-N 2,2,4-trimethyl-1h-quinoline Chemical compound C1=CC=C2C(C)=CC(C)(C)NC2=C1 ZNRLMGFXSPUZNR-UHFFFAOYSA-N 0.000 description 1
- GAODDBNJCKQQDY-UHFFFAOYSA-N 2-methyl-4,6-bis(octylsulfanylmethyl)phenol Chemical compound CCCCCCCCSCC1=CC(C)=C(O)C(CSCCCCCCCC)=C1 GAODDBNJCKQQDY-UHFFFAOYSA-N 0.000 description 1
- ZZMVLMVFYMGSMY-UHFFFAOYSA-N 4-n-(4-methylpentan-2-yl)-1-n-phenylbenzene-1,4-diamine Chemical compound C1=CC(NC(C)CC(C)C)=CC=C1NC1=CC=CC=C1 ZZMVLMVFYMGSMY-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical group CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 125000003172 aldehyde group Chemical group 0.000 description 1
- 125000005370 alkoxysilyl group Chemical group 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 125000001841 imino group Chemical group [H]N=* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012844 infrared spectroscopy analysis Methods 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 125000005372 silanol group Chemical group 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000011191 terminal modification Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- ICJGKYTXBRDUMV-UHFFFAOYSA-N trichloro(6-trichlorosilylhexyl)silane Chemical compound Cl[Si](Cl)(Cl)CCCCCC[Si](Cl)(Cl)Cl ICJGKYTXBRDUMV-UHFFFAOYSA-N 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L15/00—Compositions of rubber derivatives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
-
- 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 mainly relates to a rubber composition for a tire intended to be used for an undertread portion of a pneumatic tire.
- tan ⁇ at 60° C. (hereinafter, referred to as “tan ⁇ (60° C.)”) measured by dynamic viscoelasticity is generally used, and tan ⁇ (60° C.) of the rubber composition is small. The lower the exothermicity, the less. Then, as a method of reducing tan ⁇ (60° C.) of the rubber composition, for example, it is possible to reduce the compounding amount of a filler such as carbon black or increase the particle size of carbon black. Alternatively, it has been proposed to blend silica (see, for example, Patent Document 1).
- the object of the present invention is a rubber composition for a tire intended mainly for use in the undertread portion of a pneumatic tire, which has low rolling resistance, and is excellent in steering stability and durability when formed into a tire. To provide a rubber composition for a tire.
- the rubber composition for a tire of the present invention which achieves the above object has a nitrogen adsorption specific surface area N with respect to 100 parts by mass of a rubber component containing 50% by mass or more of natural rubber and 35% by mass to 50% by mass of terminal-modified butadiene rubber.
- a rubber composition for a tire comprising 50 parts by mass or more of carbon black having 2 SA of 70 m 2 /g or less, having a hardness of 65 or more and a rebound resilience at 40° C. of 80% or more. To do.
- the rubber composition for a tire according to the present invention is a combination of a terminal modified butadiene rubber in addition to a natural rubber as a rubber component, and a carbon black having a large particle size is compounded as a filler, and the hardness and the impact resilience of the rubber composition. Is sufficiently increased as described above, it is possible to improve the steering stability and durability of the tire while reducing rolling resistance. In particular, since carbon black having a large particle size and terminal-modified butadiene rubber are used in combination, it is possible to increase the compounding amount of carbon black and improve the rubber hardness without deteriorating heat generation. The performance of can be improved in a balanced manner.
- the “hardness” is the hardness of the rubber composition measured by the durometer type A at a temperature of 20° C. according to JIS K6253.
- the “repulsion elastic modulus at 40° C.” is the repulsive elastic modulus of the rubber composition measured at a temperature of 40° C. by a Lupke type repulsion elasticity testing device according to JIS K6255.
- the molecular weight distribution (Mw/Mn) obtained from the weight average molecular weight (Mw) and the number average molecular weight (Mn) of the terminal-modified butadiene rubber is preferably 2.0 or less.
- the rubber physical properties become better, and it is advantageous to reduce the rolling resistance and to improve the steering stability and durability of the tire.
- the "weight average molecular weight Mw" and the "number average molecular weight Mn” are measured by gel permeation chromatography (GPC) in terms of standard polystyrene.
- the terminal functional group of the terminal-modified butadiene rubber is at least one of a hydroxyl group, an amino group, an alkoxyl group, and an epoxy group. This increases the affinity with carbon black and further improves the dispersibility of carbon black, so it is possible to more effectively increase rubber hardness and adhesiveness while maintaining low exothermicity, and balance these performances. It is advantageous to be well balanced.
- the amine anti-aging agent it is preferable to add 1.0 to 4.0 parts by mass of the amine anti-aging agent to 100 parts by mass of the rubber component. Further, it is preferable to add more than 0 parts by mass and 2.0 parts by mass or less of wax to 100 parts by mass of the rubber component. By thus blending the antioxidant and wax, the crack resistance and workability can be improved.
- the rubber composition for a tire of the present invention is preferably used in the undertread portion of a pneumatic tire, and a pneumatic tire using the rubber composition for a tire of the present invention in the undertread portion has steering stability and durability. It is possible to improve fuel efficiency while maintaining good performance.
- the rubber component is a diene rubber, which always contains natural rubber and terminal-modified butadiene rubber.
- the natural rubber a rubber normally used in a rubber composition for tires can be used. By blending natural rubber, it is possible to obtain sufficient rubber strength as a rubber composition for tires.
- the content of the natural rubber is 50% by mass or more, preferably 50% by mass to 70% by mass, more preferably 60% by mass to 65% by mass. If the content of natural rubber is less than 50% by mass, the rubber strength will decrease.
- the terminal-modified butadiene rubber is a butadiene rubber modified with an organic compound having a functional group at one or both ends of the molecular chain.
- Examples of the functional group that modifies the terminal of the molecular chain include an alkoxysilyl group, a hydroxyl group (hydroxyl group), an aldehyde group, a carboxyl group, an amino group, an amide group, an imino group, an alkoxyl group, an epoxy group, an amide group, a thiol group, Examples thereof include ether groups and siloxane bonding groups. Among them, at least one selected from a hydroxyl group (hydroxyl group), an amino group, an amide group, an alkoxyl group, an epoxy group, and a siloxane bonding group is preferable.
- the siloxane bonding group is a functional group having a —O—Si—O— structure.
- the content of the terminal-modified butadiene rubber is 35% by mass to 50% by mass, preferably 40% by mass to 50% by mass. If the compounding amount of the terminal-modified butadiene rubber is less than 35% by mass, fuel economy is deteriorated. If the compounding amount of the terminal-modified butadiene rubber exceeds 50% by mass, the rubber strength will decrease.
- the molecular weight distribution (Mw/Mn) of the terminal-modified butadiene rubber is preferably 2.0 or less, more preferably 1.1 to 1.6. In this way, by using a terminal-modified butadiene rubber with a narrow molecular weight distribution, the rubber physical properties become better, and rolling resistance is reduced while effectively improving steering stability and durability when used as a tire. can do.
- Mw/Mn molecular weight distribution of the terminal-modified butadiene rubber exceeds 2.0, the hysteresis loss becomes large, the heat generation property of the rubber becomes large, and the compression set resistance decreases.
- the glass transition temperature Tg of the terminal-modified butadiene rubber used in the present invention is preferably ⁇ 85° C. or lower, more preferably ⁇ 90° C. to ⁇ 100° C. By setting the glass transition temperature Tg in this way, heat generation can be effectively reduced. When the glass transition temperature Tg exceeds ⁇ 80° C., the effect of reducing heat generation cannot be sufficiently obtained.
- the glass transition temperature Tg of natural rubber is not particularly limited, but can be set to, for example, ⁇ 70° C. to ⁇ 80° C.
- the terminal-modified butadiene rubber used in the present invention has a vinyl content of preferably 0.1% by mass to 20% by mass, more preferably 0.1% by mass to 15% by mass.
- the vinyl content of the terminal-modified butadiene rubber is less than 0.1% by mass, the affinity with carbon black is insufficient and it becomes difficult to sufficiently reduce heat generation.
- the vinyl content of the terminal-modified butadiene rubber exceeds 20% by mass, the glass transition temperature Tg of the rubber composition rises, and rolling resistance and abrasion resistance cannot be sufficiently improved.
- the vinyl unit content of the terminal-modified butadiene rubber is to be measured by infrared spectroscopic analysis (Hampton method).
- the increase/decrease in the vinyl unit content in the terminal-modified butadiene rubber can be appropriately adjusted by a usual method such as a catalyst.
- the tire rubber composition of the present invention may contain a diene rubber other than natural rubber and terminal-modified butadiene rubber.
- diene rubbers include, for example, butadiene rubber without terminal modification, styrene butadiene rubber, isoprene rubber, acrylonitrile-butadiene rubber and the like. These diene rubbers can be used alone or as an arbitrary blend.
- the tire rubber composition of the present invention always contains carbon black as a filler.
- carbon black used in the present invention has a nitrogen adsorption specific surface area N 2 SA of 70 m 2 /g or less, preferably 35 m 2 /g to 60 m 2 /g, and more preferably 35 m 2 /g to 50 m 2 /g. is there.
- N 2 SA nitrogen adsorption specific surface area
- the nitrogen adsorption specific surface area N 2 SA of carbon black exceeds 70 m 2 /g, the exothermic property deteriorates.
- the nitrogen adsorption specific surface area N 2 SA of carbon black is measured according to JIS 6217-2.
- the blending amount of carbon black is 50 parts by mass or more, preferably 55 parts by mass to 65 parts by mass, and more preferably 57 parts by mass to 60 parts by mass with respect to 100 parts by mass of the above rubber component. If the blending amount of the filler is less than 50 parts by mass, the hardness will decrease.
- the rubber composition of the present invention may contain an inorganic filler other than carbon black.
- inorganic fillers include silica, clay, talc, calcium carbonate, mica, aluminum hydroxide and the like.
- the weight ratio of silica to carbon black is preferably 0.1 to 0.5, more preferably 0.15 to 0.3. Good to do. If the weight ratio is out of the above range, the effect of increasing the rubber hardness while maintaining the low exothermicity cannot be obtained. In particular, if the weight ratio of silica is too large, the exothermicity may deteriorate.
- the total amount of the fillers is preferably 70 parts by mass or less, more preferably 55 parts by mass to 60 parts by mass. If the total amount of the fillers is more than 75 parts by mass, heat generation may be deteriorated. From the relationship between the above blending amount and the weight ratio, when silica is used in combination, the blending amount of silica is preferably 5 parts by mass to 20 parts by mass, more preferably 5 parts by mass with respect to 100 parts by mass of the diene rubber. Parts to 10 parts by mass.
- the CTAB adsorption specific surface area of silica is preferably 100 m 2 /g to 250 m 2 /g, more preferably 135 m 2 /g to 210 m 2 /g. If the CTAB adsorption specific surface area of silica is less than 100 m 2 /g, the rubber strength will decrease. When the CTAB adsorption specific surface area of silica exceeds 250 m 2 /g, the heat generation property deteriorates. In the present invention, the CTAB adsorption specific surface area of silica shall be measured in accordance with ISO 5794.
- an amine anti-aging agent and/or wax By compounding these, crack resistance and workability can be improved.
- the compounding amount of the amine anti-aging agent is preferably 1.0 part by mass to 4.0 parts by mass, and more preferably 1.5 parts by mass to 3.5 parts by mass with respect to 100 parts by mass of the rubber component.
- the blending amount of the wax is preferably more than 0 parts by mass and 2.0 parts by mass or less, more preferably 0.1 parts by mass or more and 2.0 parts by mass or less with respect to 100 parts by mass of the rubber component, and an amine-based antioxidant and a wax. May be blended alone or in combination.
- the amount of the amine-based antioxidant is less than 1.0 part by mass, the effect of improving the crack resistance and workability cannot be expected, and especially the crack resistance is lowered. If the compounding amount of the amine anti-aging agent exceeds 4.0 parts by mass, the workability is deteriorated. If the amount of the wax compounded exceeds 2.0 parts by mass, the processability will decrease.
- compounding agents may be added to the rubber composition for tires of the present invention.
- Other compounding agents include reinforcing fillers other than carbon black and silica, vulcanization or crosslinking agents, vulcanization accelerators, antioxidants other than amines, liquid polymers, thermosetting resins, and thermoplastic resins.
- Various compounding agents generally used for pneumatic tires can be exemplified.
- the compounding amount of these compounding agents may be a conventional general compounding amount as long as the object of the present invention is not violated.
- kneading machine a usual kneading machine for rubber, for example, Banbury mixer, kneader, roll or the like can be used.
- the hardness of the rubber composition for a tire of the present invention having such a composition is 65 or more, preferably 65 to 75, more preferably 65 to 70.
- the impact resilience at 40° C. of the rubber composition for a tire of the present invention is 80% or more, preferably 80% to 85%, more preferably 82% to 85%. Since the rubber composition of the present invention has such physical properties, it is possible to improve rolling stability and durability of the tire while reducing rolling resistance. When the hardness is less than 65, the steering stability when used as a tire is deteriorated. When the impact resilience is less than 80%, heat generation is deteriorated and the rolling resistance cannot be reduced.
- the hardness and the impact resilience are not determined only by the above-mentioned composition, but are physical properties that can be adjusted by the kneading conditions and the kneading method.
- the rubber composition for a tire of the present invention can improve rolling stability and durability when being made into a tire while reducing rolling resistance due to the above-mentioned composition and physical properties.
- end-modified butadiene rubber is used in combination, and carbon black having a large particle size is blended as a filler, and carbon black having a large particle size and terminal-modified butadiene rubber are combined.
- carbon black having a large particle size is blended as a filler, and carbon black having a large particle size and terminal-modified butadiene rubber are combined.
- the hardness and impact resilience of the rubber composition are sufficiently increased as described above, it is possible to improve the steering stability and durability of the tire while reducing rolling resistance. Therefore, these performances can be improved in a well-balanced manner.
- the rubber composition for a tire of the present invention is preferably used in the undertread portion of a pneumatic tire, and the pneumatic tire using the rubber composition for a tire of the present invention in the undertread portion has steering stability and durability. Fuel economy performance can be improved while maintaining good performance.
- the hardness of the rubber composition was measured at a temperature of 20° C. by a durometer type A in accordance with JIS K6253. Further, the impact resilience of the rubber composition was measured at a temperature of 40° C. by a Lupke impact resilience tester in accordance with JIS K6255.
- the obtained rubber composition was evaluated for fuel efficiency, steering stability, durability, crack resistance, and workability by the methods shown below.
- a test tire (tire size 215/45R17) using the obtained rubber composition as an undertread was prepared and mounted on a standard rim (rim size 7JJ) to an air pressure of 230 kPa and an indoor drum tester (drum diameter). : 1707 mm) and rolling at a speed of 80 km/h while being pressed against the drum under a load equivalent to 85% of the maximum load under the air pressure described in JATMA Yearbook 2009 The resistance was measured. The evaluation result was shown by an index with the value of Standard Example 1 being 100, using the reciprocal of the measured value. The larger the index value, the smaller the rolling resistance and the better the fuel economy performance.
- a test driver conducted a sensory evaluation on the road surface responsiveness when changing the lane at the time of running and traveling 80 km/h on a test course consisting of a paved road surface. The evaluation results are shown by index values with the standard example 1 being 100. The larger this index value, the better the road surface response at the time of lane change, and the better the steering stability.
- Durability A test tire (tire size 215/45R17) in which the obtained rubber composition was used as an undertread was prepared, mounted on a standard rim (rim size 7JJ), the air pressure was set to 230 kPa, and mounted on a test vehicle of displacement 2000 cc. Then, the car was run on an 8-shaped turning test course under conditions of a turning acceleration of 0.8 G and 500 laps, and the amount of wear of the tread portion after running was measured. The evaluation results are shown by an index with the standard example 1 being 100, using the reciprocal of the measured value. The larger the index value, the smaller the amount of wear and the more excellent the durability.
- the obtained rubber composition was extruded into a sheet, and two extrudates (sample for crimping) 3 hours after the extruding were subjected to a crimping load of 0.98 N, a crimping time of 0 seconds, and a crimping speed of 50 cm/min. After press-bonding under the conditions, the film was peeled under the condition of a peeling speed of 125 cm/min, and the adhesive force at that time was measured by a PICMA type tack meter (manufactured by Toyo Seiki Seisaku-sho, Ltd.). The evaluation results are shown in AC below.
- the "tack index” used for the evaluation of A to C is an index with the measured value as standard example 1 being 100.
- Tables 1 and 2 The types of raw materials used in Tables 1 and 2 are shown below.
- -NR natural rubber
- TSR20 glass transition temperature Tg: -65°C
- SBR styrene butadiene rubber
- Nipol 1502 glass transition temperature: -60°C
- -Modified S-SBR Terminal-modified solution-polymerized styrene-butadiene rubber
- Nipol NS612 manufactured by Nippon Zeon Co., Ltd.
- BR butadiene rubber
- Nipol BR1220 manufactured by Zeon Corporation (glass transition temperature Tg: -105°C)
- -Modified BR1 end-modified butadiene rubber
- JSR BR54 glass transition temperature Tg: -107°C, functional group: silanol group, molecular weight distribution 2.5
- Modified BR2 terminal modified butadiene rubber synthesized by the following method (glass transition temperature Tg: -93°C, functional group: polyorganosiloxane group)
- BR3 end-modified butadiene rubber, Nipol BR1250H manufactured by Nippon Zeon Co., Ltd.
- CB1 Carbon black, Tokai Carbon Co., Ltd., Seast KHP (nitrogen adsorption specific surface area N 2 SA: 85 m 2 /g)
- CB2 carbon black, Niteron #GN (Nitrogen adsorption specific surface area N 2 SA: 35 m 2 /g) manufactured by Shin Nikka Carbon Co., Ltd.
- Silica Ultrasil VN3 (CTAB adsorption specific surface area: 153 m 2 /g) manufactured by Degussa ⁇ Zinc oxide: Three types of zinc oxide manufactured by Shodo Chemical Industry ⁇ Stearic acid: Lunac S-25 manufactured by Kao -Anti-aging agent 1: amine-based anti-aging agent, Santoflex 6PPD manufactured by Flexis -Anti-aging agent 2: amine-ketone type anti-aging agent, Nocrac 224 manufactured by Ouchi Shinko Chemical Industry Co., Ltd. ⁇ Wax: Ouchi Shinko Chemical Co., Ltd. Sannok Sulfur: Shikoku Kasei Co., Ltd. Mucron OT-20 ⁇ Vulcanization accelerator: Nocceller CZ manufactured by Ouchi Shinko Chemical Industry Co., Ltd.
- the maximum temperature during the polymerization reaction was 80°C. After the continuous addition was completed, the polymerization reaction was continued for another 15 minutes, and after confirming that the polymerization conversion rate was in the range of 95% to 100%, a small amount of the polymerization solution was sampled. A small amount of the sampled polymerization solution was quenched by adding excess methanol and then air-dried to obtain a polymer, which was used as a sample for gel permeation chromatography (GPC) analysis. Using the sample, the peak top molecular weight and the molecular weight distribution of the polymer (corresponding to a conjugated diene-based polymer chain having an active end) were measured and found to be "230,000" and "1.04", respectively.
- GPC gel permeation chromatography
- the styrene-butadiene rubber was blended in place of the terminal-modified butadiene rubber, so the fuel economy performance deteriorated.
- the terminal-modified solution-polymerized styrene-butadiene rubber was blended in place of the terminal-modified butadiene rubber, so the durability was deteriorated.
- the rubber composition (tire) of Comparative Example 3 was poor in durability because the compounding amount of the terminal-modified butadiene rubber was too small.
- the steering stability and durability deteriorated because the amount of carbon black blended was too small.
- the rubber composition (tire) of Comparative Example 5 contained not only natural rubber and terminal-modified butadiene rubber but also styrene-butadiene rubber, and thus the impact resilience deteriorated.
- the rubber composition (tire) of Comparative Example 7 had too low a hardness, and thus had poor steering stability.
- the rubber composition (tire) of Comparative Example 8 had a too small impact resilience, and thus the fuel efficiency was deteriorated.
- the rubber composition (tire) of Comparative Example 9 does not contain the terminal-modified butadiene rubber, it is not possible to obtain the effect of improving the fuel economy performance and the steering stability performance, and further, only the non-amine-based antioxidant is blended. Therefore, the crack resistance and durability deteriorated.
- the rubber composition (tire) of Comparative Example 10 since the terminal-modified butadiene rubber was not blended, it was not possible to obtain the effect of improving the fuel economy performance, the steering stability performance, and the durability, and further, the antioxidant content was large. Since it was too much, workability deteriorated.
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Tires In General (AREA)
Abstract
L'invention concerne une composition de caoutchouc pour pneumatiques qui est destinée principalement à être utilisée dans la production de la partie d'épaisseur sous sculpture d'un pneumatique et qui permet d'obtenir des pneumatiques ayant une faible résistance au roulement et d'excellentes propriétés en termes de stabilité de direction et de durabilité. Du noir de carbone ayant une surface spécifique déterminée par adsorption d'azote N2SA égale ou inférieure à 70 m2/g est incorporé dans une quantité d'au moins 50 parties en masse dans 100 parties en masse d'un ingrédient de caoutchouc comprenant au moins 50 % en masse de caoutchouc naturel et 35 à 50 % en masse de caoutchouc de butadiène modifié par un groupe terminal, et la composition de caoutchouc est conçue pour avoir une dureté égale ou supérieure à 65 et une résilience à 40 °C égale ou supérieure à 80 %.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2020513955A JP7457252B2 (ja) | 2018-11-30 | 2019-11-22 | タイヤ用ゴム組成物 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018225399 | 2018-11-30 | ||
JP2018-225399 | 2018-11-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2020110940A1 true WO2020110940A1 (fr) | 2020-06-04 |
Family
ID=70852304
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2019/045802 WO2020110940A1 (fr) | 2018-11-30 | 2019-11-22 | Composition de caoutchouc pour pneumatique |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP7457252B2 (fr) |
WO (1) | WO2020110940A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115181342A (zh) * | 2022-08-22 | 2022-10-14 | 四川远星橡胶有限责任公司 | 一种高回弹性高模量低生热胎唇护胶及其制备方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009084285A1 (fr) * | 2007-12-28 | 2009-07-09 | Sumitomo Rubber Industries, Ltd. | Composition de caoutchouc pour pneu |
WO2010041737A1 (fr) * | 2008-10-09 | 2010-04-15 | 株式会社ブリヂストン | Compositions de caoutchouc, leur procédé de fabrication et pneus les utilisant |
JP2011178848A (ja) * | 2010-02-26 | 2011-09-15 | Sumitomo Rubber Ind Ltd | タイヤ用ゴム組成物及び空気入りタイヤ |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5820357B2 (ja) * | 2012-11-08 | 2015-11-24 | 住友ゴム工業株式会社 | サイドウォール、ウイング、ベーストレッド、サイドウォールパッキン、ブレーカークッション又はタイガム用ゴム組成物及び空気入りタイヤ |
-
2019
- 2019-11-22 WO PCT/JP2019/045802 patent/WO2020110940A1/fr active Application Filing
- 2019-11-22 JP JP2020513955A patent/JP7457252B2/ja active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009084285A1 (fr) * | 2007-12-28 | 2009-07-09 | Sumitomo Rubber Industries, Ltd. | Composition de caoutchouc pour pneu |
WO2010041737A1 (fr) * | 2008-10-09 | 2010-04-15 | 株式会社ブリヂストン | Compositions de caoutchouc, leur procédé de fabrication et pneus les utilisant |
JP2011178848A (ja) * | 2010-02-26 | 2011-09-15 | Sumitomo Rubber Ind Ltd | タイヤ用ゴム組成物及び空気入りタイヤ |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115181342A (zh) * | 2022-08-22 | 2022-10-14 | 四川远星橡胶有限责任公司 | 一种高回弹性高模量低生热胎唇护胶及其制备方法 |
CN115181342B (zh) * | 2022-08-22 | 2023-09-26 | 四川远星橡胶有限责任公司 | 一种高回弹性高模量低生热胎唇护胶及其制备方法 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2020110940A1 (ja) | 2021-10-14 |
JP7457252B2 (ja) | 2024-03-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9080042B2 (en) | Rubber blend with improved rolling resistance behavior | |
JP7331332B2 (ja) | タイヤ用ゴム組成物およびタイヤ | |
JP5569655B2 (ja) | タイヤ用ゴム組成物、空気入りタイヤ | |
JP2015229701A (ja) | タイヤトレッド用ゴム組成物 | |
US10533083B2 (en) | Rubber composition and tire | |
JP2017149897A (ja) | タイヤ、及びその製造方法 | |
JP7024712B2 (ja) | タイヤ用ゴム組成物及び空気入りタイヤ | |
WO2020162304A1 (fr) | Composition de caoutchouc, et pneumatique | |
JP7103434B2 (ja) | 空気入りタイヤ | |
JP7159566B2 (ja) | タイヤ用ゴム組成物 | |
JP6521611B2 (ja) | 加硫ゴム組成物およびそれを用いたタイヤ | |
JP6824813B2 (ja) | 空気入りタイヤ | |
JP7315814B2 (ja) | リムクッション用ゴム組成物 | |
JP2021181530A (ja) | タイヤ用ゴム組成物 | |
JP7457252B2 (ja) | タイヤ用ゴム組成物 | |
JP7003570B2 (ja) | スタッドレスタイヤ用ゴム組成物 | |
JP6790707B2 (ja) | 加硫ゴム組成物およびそれを用いたタイヤ | |
JP7188117B2 (ja) | タイヤ用ゴム組成物 | |
JP7271961B2 (ja) | 空気入りタイヤ | |
JP2020117664A (ja) | タイヤ用ゴム組成物 | |
WO2021024667A1 (fr) | Composition de caoutchouc pour pneu et pneu | |
JP2021080405A (ja) | タイヤ用ゴム組成物及びタイヤ | |
JP7473825B2 (ja) | タイヤ用ゴム組成物 | |
JP7103458B2 (ja) | タイヤ用ゴム組成物及びタイヤ | |
JP2020117601A (ja) | タイヤ用ゴム組成物 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 2020513955 Country of ref document: JP Kind code of ref document: A |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 19888718 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 19888718 Country of ref document: EP Kind code of ref document: A1 |