WO2022224663A1 - タイヤ用ゴム組成物 - Google Patents
タイヤ用ゴム組成物 Download PDFInfo
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- WO2022224663A1 WO2022224663A1 PCT/JP2022/012782 JP2022012782W WO2022224663A1 WO 2022224663 A1 WO2022224663 A1 WO 2022224663A1 JP 2022012782 W JP2022012782 W JP 2022012782W WO 2022224663 A1 WO2022224663 A1 WO 2022224663A1
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- mass
- rubber
- tire
- parts
- tires
- Prior art date
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 128
- 239000005060 rubber Substances 0.000 title claims abstract description 128
- 239000000203 mixture Substances 0.000 title claims abstract description 72
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000005062 Polybutadiene Substances 0.000 claims abstract description 38
- 229920002857 polybutadiene Polymers 0.000 claims abstract description 38
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 30
- 239000006229 carbon black Substances 0.000 claims abstract description 29
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims abstract description 17
- 238000001179 sorption measurement Methods 0.000 claims abstract description 17
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 12
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 12
- 229920001194 natural rubber Polymers 0.000 claims abstract description 12
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical class C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims abstract description 7
- 150000001412 amines Chemical class 0.000 claims description 35
- 239000003795 chemical substances by application Substances 0.000 claims description 31
- 230000003712 anti-aging effect Effects 0.000 claims description 26
- 239000003963 antioxidant agent Substances 0.000 claims description 16
- 230000003078 antioxidant effect Effects 0.000 claims description 15
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 238000004073 vulcanization Methods 0.000 claims description 8
- 229920003049 isoprene rubber Polymers 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 abstract description 30
- 230000000704 physical effect Effects 0.000 description 17
- 238000002156 mixing Methods 0.000 description 15
- 238000012360 testing method Methods 0.000 description 15
- 239000011324 bead Substances 0.000 description 12
- 239000000945 filler Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 9
- 238000013329 compounding Methods 0.000 description 9
- 229910052717 sulfur Inorganic materials 0.000 description 9
- 239000011593 sulfur Substances 0.000 description 9
- 239000006087 Silane Coupling Agent Substances 0.000 description 8
- 230000007423 decrease Effects 0.000 description 8
- 230000020169 heat generation Effects 0.000 description 8
- 230000003014 reinforcing effect Effects 0.000 description 8
- 239000000446 fuel Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 229920003244 diene elastomer Polymers 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 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 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 229920000459 Nitrile rubber Polymers 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 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 3
- 238000004898 kneading Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- 238000011088 calibration curve Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000004817 gas chromatography Methods 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- IABJHLPWGMWHLX-UHFFFAOYSA-N 3-(1,3-benzothiazol-2-yl)propyl-trimethoxysilane Chemical compound C1=CC=C2SC(CCC[Si](OC)(OC)OC)=NC2=C1 IABJHLPWGMWHLX-UHFFFAOYSA-N 0.000 description 1
- DCQBZYNUSLHVJC-UHFFFAOYSA-N 3-triethoxysilylpropane-1-thiol Chemical compound CCO[Si](OCC)(OCC)CCCS DCQBZYNUSLHVJC-UHFFFAOYSA-N 0.000 description 1
- UJAWGGOCYUPCPS-UHFFFAOYSA-N 4-(2-phenylpropan-2-yl)-n-[4-(2-phenylpropan-2-yl)phenyl]aniline Chemical compound C=1C=C(NC=2C=CC(=CC=2)C(C)(C)C=2C=CC=CC=2)C=CC=1C(C)(C)C1=CC=CC=C1 UJAWGGOCYUPCPS-UHFFFAOYSA-N 0.000 description 1
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 description 1
- 241001441571 Hiodontidae Species 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- UTGQNNCQYDRXCH-UHFFFAOYSA-N N,N'-diphenyl-1,4-phenylenediamine Chemical compound C=1C=C(NC=2C=CC=CC=2)C=CC=1NC1=CC=CC=C1 UTGQNNCQYDRXCH-UHFFFAOYSA-N 0.000 description 1
- OUBMGJOQLXMSNT-UHFFFAOYSA-N N-isopropyl-N'-phenyl-p-phenylenediamine Chemical compound C1=CC(NC(C)C)=CC=C1NC1=CC=CC=C1 OUBMGJOQLXMSNT-UHFFFAOYSA-N 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- JYSSGQITKNFRQE-UHFFFAOYSA-N [3-(4-anilinoanilino)-2-hydroxypropyl] 2-methylprop-2-enoate Chemical compound C1=CC(NCC(O)COC(=O)C(=C)C)=CC=C1NC1=CC=CC=C1 JYSSGQITKNFRQE-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical class C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000004615 ingredient Substances 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
- KEZPMZSDLBJCHH-UHFFFAOYSA-N n-(4-anilinophenyl)-4-methylbenzenesulfonamide Chemical compound C1=CC(C)=CC=C1S(=O)(=O)NC(C=C1)=CC=C1NC1=CC=CC=C1 KEZPMZSDLBJCHH-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 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
- JPPLPDOXWBVPCW-UHFFFAOYSA-N s-(3-triethoxysilylpropyl) octanethioate Chemical compound CCCCCCCC(=O)SCCC[Si](OCC)(OCC)OCC JPPLPDOXWBVPCW-UHFFFAOYSA-N 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- -1 triethoxysilylpropyl Chemical group 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/0041—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers
- B60C11/005—Tyre tread bands; Tread patterns; Anti-skid inserts comprising different tread rubber layers with cap and base layers
-
- 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
-
- 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
-
- 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
- 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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/005—Stabilisers against oxidation, heat, light, ozone
-
- 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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- 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 intended mainly for use in the undertread portion of tires.
- a method for reducing heat build-up of a rubber composition specifically, as a method for reducing rubber physical properties (for example, tan ⁇ at 60° C. by dynamic viscoelasticity measurement), which is an index of heat build-up, carbon black or the like is used. It is known to reduce the amount of filler compounded or to increase the particle size of carbon black. Alternatively, it is known that adding silica is also effective in reducing heat build-up. However, if these methods are used to reduce heat generation, there is a risk that sufficient rubber hardness and fatigue resistance will not be obtained, and when used in tires (especially when used in the undertread portion), cornering power will be reduced.
- An object of the present invention is to provide a rubber composition for tires that can reduce rolling resistance while maintaining and improving steering stability and durability well when used in tires.
- the rubber composition for tires of the present invention which achieves the above objects, has a CTAB adsorption specific surface area of 70 m 2 with respect to 100 parts by mass of a rubber component containing 50% by mass or more of natural rubber and 10% to 40% by mass of butadiene rubber. 35 parts by mass to 60 parts by mass of carbon black having a specific surface area of less than /g and 3 parts by mass to 30 parts by mass of silica having a CTAB adsorption specific surface area of less than 180 m 2 /g.
- the butadiene rubber has a cis-1,4 bond content of 97% or more, a Mooney viscosity ML 1+4 at 100°C of 45 or more, and a 5% by mass toluene solution viscosity Tcp at 25°C [unit: cps]. and the Mooney viscosity ML 1+4 , a ratio Tcp/ML 1+4 of 2.0 to 3.0.
- the rubber composition for a tire of the present invention uses, in addition to natural rubber, a specific butadiene rubber that satisfies the above conditions as a rubber component, and carbon black having a large particle size and silica are blended in appropriate amounts as fillers. Therefore, when used in a tire, it is possible to improve steering stability and durability while reducing rolling resistance.
- Cis-1,4 bond content refers to the cis-1,4 - percentage of binding, determined by infrared spectroscopy (Hampton method).
- Mooney viscosity ML 1+4 at 100°C was measured in accordance with JIS K6300-1:2001 using a Mooney viscometer with an L-shaped rotor, a preheating time of 1 minute, a rotor rotation time of 4 minutes, and a temperature of 100°C.
- 5% by weight toluene solution viscosity Tcp at 25°C is the viscosity of a toluene solution containing 5% by weight of the target butadiene rubber, and is measured at 25% by using a Canon Fenske viscometer. shall be measured in °C.
- the rubber component may further contain isoprene rubber or styrene-butadiene rubber.
- the hardness at 20 ° C. is 60 to 65
- the tensile stress (M100) at 100% elongation at 100 ° C. is 2.0 MPa to 4.0 MPa
- the tensile breaking strength at 100 ° C. is TB [unit: MPa].
- the product (TB ⁇ EB) with the elongation at break EB [unit: %] at 100° C. is preferably 2000 or more. Having such rubber physical properties is advantageous for improving steering stability and durability while reducing rolling resistance when used in tires.
- hardness is the hardness of a rubber composition measured at a temperature of 20°C with a durometer type A according to JIS K6253.
- Teensile stress at 100% elongation at 100°C (M100) is a value measured in accordance with JIS K6251 using a No. 3 dumbbell test piece under conditions of a tensile speed of 500 mm/min and a temperature of 100°C. .
- Teensile breaking strength TB at 100°C is a value [unit: MPa] measured at a temperature of 100°C in accordance with JIS K6251.
- Elongation at break EB at 100°C is a value [unit: %] measured at a temperature of 100°C in accordance with JIS K6251.
- the above-described rubber composition for a tire of the present invention includes a tread portion extending in the tire circumferential direction and forming an annular shape, and includes a cap tread constituting a tread surface of the tread portion and an undertread disposed on the inner peripheral side of the cap tread. It can be suitably used for the undertread in the tire having.
- a tire using the rubber composition for tires of the present invention in the undertread (hereinafter referred to as the tire of the present invention) has low rolling resistance, steering stability and durability due to the above-mentioned properties of the rubber composition for tires of the present invention. can be highly compatible with sexuality.
- the tire to which the rubber composition for tires of the present invention is applied is preferably a pneumatic tire, but may be a non-pneumatic tire.
- a pneumatic tire can be filled with air, an inert gas such as nitrogen, or other gas.
- the under-groove gauge GT of the circumferential groove formed in the tread portion is 2.5 mm or less. Further, it is preferable that the ratio G U /G C between the rubber gauge G C of the cap tread and the rubber gauge G U of the undertread below the circumferential groove is 0.3 to 0.8. With such dimensions, the balance between the tread portion, cap tread, and undertread at the bottom of the groove is well balanced, reducing rolling resistance while improving steering stability and durability (especially durability against groove cracks). to improve the
- the amine anti-aging agent in the tire of the present invention, it is preferable that 1.0 to 4.0 parts by mass of the amine anti-aging agent is blended with 100 parts by mass of the rubber component.
- the content A of the amine antioxidant in the cap tread below the groove of the circumferential groove is more than 0.8% by mass and less than 2.0% by mass
- the amine in the undertread below the groove of the circumferential groove The content B of the anti-aging agent is more than 0.7% by mass and less than 1.5% by mass, and the ratio B/A between the content A and the content B is 0.6 or more and 1.2 or less is preferred.
- the content of the amine-based anti-aging agent is a value measured in a new tire that has not been run, and for example, as shown below, it can be measured by gas chromatography in accordance with JIS K6229 and JIS K0114. can be done. That is, a new tire that has not been driven is dismantled, and the cap tread and undertread at the groove lower position of the circumferential groove are each sliced thinly, cut into test pieces of about 1 mm square and about 30 mm in length, and are cut into 8 pieces using acetone. Time extraction is carried out, and the obtained filtrate is returned to room temperature and used as a sample for gas chromatograph measurement.
- a solution (standard sample) is prepared by swinging the concentration of the amine anti-aging agent to be measured at four points in the range of 100 ppm to 1000 ppm. Then, the area of the obtained gas chromatograph measurement sample is obtained, and the content of the amine anti-aging agent in the gas chromatograph measurement sample is calculated from the calibration curve.
- the vulcanization temperature is preferably 145°C to 170°C.
- FIG. 1 is a meridional cross-sectional view of a pneumatic tire according to an embodiment of the present invention.
- the pneumatic tire of the present invention includes a tread portion 1, a pair of sidewall portions 2 arranged on both sides of the tread portion 1, and a pair of sidewall portions 2 arranged radially inward of the sidewall portions 2. and a pair of bead portions 3.
- symbol CL indicates the tire equator.
- FIG. 1 is a meridional sectional view and is not depicted, the tread portion 1, the sidewall portion 2, and the bead portion 3 each extend in the tire circumferential direction and form an annular shape, thereby forming a toroidal pneumatic tire.
- a basic structure of the shape is constructed. The following explanation using FIG. 1 is basically based on the meridian cross-sectional shape shown in the drawing, but each tire constituent member extends in the tire circumferential direction and forms an annular shape.
- a carcass layer 4 is mounted between a pair of left and right bead portions 3 .
- the carcass layer 4 includes a plurality of reinforcing cords extending in the tire radial direction, and is folded back from the vehicle inner side to the outer side around bead cores 5 arranged in the respective bead portions 3 .
- a bead filler 6 is arranged on the outer periphery of the bead core 5, and the bead filler 6 is wrapped by the main body portion and the folded portion of the carcass layer 4.
- a plurality of belt layers 7 are embedded in the outer peripheral side of the carcass layer 4 in the tread portion 1 .
- Each belt layer 7 includes a plurality of reinforcing cords inclined with respect to the tire circumferential direction, and the reinforcing cords are arranged so as to cross each other between the layers.
- the inclination angle of the reinforcing cords with respect to the tire circumferential direction is set, for example, in the range of 10° to 40°.
- a belt reinforcing layer 8 (two layers of a full cover 8a covering the entire width of the belt layer 7 and an edge cover 8b covering the edge of the belt layer 7 locally) is provided on the outer peripheral side of the belt layer 7 .
- the belt reinforcing layer 8 contains organic fiber cords oriented in the tire circumferential direction. In the belt reinforcing layer 8, the angle of the organic fiber cords with respect to the tire circumferential direction is set to 0° to 5°, for example.
- a tread rubber layer 11 is arranged on the outer peripheral side of the carcass layer 4 in the tread portion 1, a side rubber layer 12 is arranged on the outer peripheral side (outer side in the tire width direction) of the carcass layer 4 in the sidewall portion 2, and a side rubber layer 12 is arranged on the bead portion 3.
- a rim cushion rubber layer 13 is arranged on the outer peripheral side (the outer side in the tire width direction) of the carcass layer 4 .
- the tread rubber layer 11 has a structure in which two types of rubber layers having different physical properties (a cap tread 11C forming a tread surface of the tread portion 1 and an undertread 11U arranged on the inner peripheral side thereof) are laminated in the tire radial direction. .
- the rubber composition for tires of the present invention is mainly used for the undertread 11U of such tires. Therefore, in the tire to which the present invention is applied, if the tread portion 1 (tread rubber layer 11) is composed of the cap tread 11C and the undertread 11U, the basic structure of the other parts is limited to the structure described above. not a thing
- the rubber component is a diene rubber, and necessarily contains natural rubber and butadiene rubber.
- the rubber composition for tires of the present invention may optionally contain isoprene rubber and styrene-butadiene rubber. These optionally blended diene rubbers can be used alone or as an arbitrary blend.
- the natural rubber it is possible to use rubber that is commonly used in rubber compositions for tires. By blending natural rubber, it is possible to obtain sufficient rubber strength as a rubber composition for tires.
- the natural rubber content is 50% by mass or more, preferably 60% to 90% by mass, and more preferably 65% to 85% by mass, based on 100% by mass of the diene rubber as a whole.
- isoprene rubber is used as an optional component, the total content of natural rubber and isoprene rubber is preferably 60% to 90% by mass, more preferably 65% to 85% by mass. If the natural rubber content is less than 50% by mass, sufficient rubber strength cannot be ensured.
- the butadiene rubber used in the present invention is an unmodified butadiene rubber having a cis-1,4 bond content of 97% or more, a Mooney viscosity ML 1+4 at 100°C of 45 or more, and 5 mass% at 25°C. It has physical properties such that the ratio Tcp/ML 1+4 between the toluene solution viscosity Tcp [unit: cps] and the Mooney viscosity ML 1 +4 is 2.0 to 3.0.
- the cis-1,4 bond content of the butadiene rubber used in the present invention is 97% or more, preferably 98% to 100%, more preferably 99% to 100%, as described above.
- Such a high content of cis-1,4 bonds is advantageous for improving breaking strength and breaking elongation. If the cis-1,4 bond content is less than 97%, the strength at break, elongation at break and cold resistance are lowered.
- the cis-1,4 bond content of the butadiene rubber can be appropriately adjusted by a conventional method such as a catalyst.
- the Mooney viscosity ML 1+4 at 100° C. of the butadiene rubber used in the present invention is 45 or more, preferably 45-52, more preferably 45-50, as described above.
- the aforementioned ratio Tcp/ML 1+4 is 2.0 to 3.0, preferably 2.2 to 3.0, more preferably 2.4 to 2.4, as described above. 3.0. Having a specific ratio Tcp/ML 1+4 in this manner is advantageous in achieving both low heat generation, breaking strength and breaking elongation. If the ratio Tcp/ML 1+4 is less than 2.0, heat build-up will deteriorate. If the ratio Tcp/ML 1+4 exceeds 3.0, workability deteriorates.
- the value of the 5% by mass toluene solution viscosity Tcp itself at 25° C. is not particularly limited, but can be set preferably from 50 cps to 200 cps, more preferably from 80 cps to 180 cps.
- the blending amount of the above-mentioned butadiene rubber is 10% by mass to 40% by mass, preferably 10% by mass to 40% by mass, more preferably 15% by mass to 35% by mass. be.
- the amount of butadiene rubber compounded is less than 10% by mass, the fuel efficiency deteriorates. If the amount of butadiene rubber exceeds 40% by mass, the strength of the rubber decreases, making it difficult to ensure the durability of the tire.
- styrene-butadiene rubber can optionally be used in combination as the diene-based rubber of the present invention. , preferably 10% to 40% by mass, more preferably 15% to 35% by mass. When styrene-butadiene rubber is used in combination, the effect of achieving both hardness and breaking properties can be added.
- the rubber composition for tires of the present invention always contains carbon black as a filler.
- carbon black By blending carbon black, the strength of the rubber composition can be increased.
- the carbon black used in the present invention has a CTAB adsorption specific surface area of less than 70 m 2 /g, preferably 25 m 2 /g to 50 m 2 /g, more preferably 30 m 2 /g to 45 m 2 /g.
- the CTAB adsorption specific surface area of carbon black is 70 m 2 /g or more, the heat build-up deteriorates.
- the blending amount of carbon black is 35 to 60 parts by mass, preferably 35 to 55 parts by mass, and more preferably 35 to 50 parts by mass based on 100 parts by mass of the rubber component. If the blending amount of carbon black is less than 35 parts by mass, the hardness will decrease. When the blending amount of carbon black exceeds 60 parts by mass, heat build-up deteriorates.
- the rubber composition for tires of the present invention always contains silica as a filler in addition to carbon black.
- silica in addition to carbon black, it is possible to increase the strength of the rubber composition while keeping the heat build-up low.
- the silica used in the present invention has a CTAB adsorption specific surface area of less than 180 m 2 /g, preferably 90 m 2 /g to 180 m 2 /g, more preferably 160 m 2 /g to 180 m 2 /g.
- silica having such a large particle size in combination with the modified butadiene rubber described above it is possible to effectively increase rubber hardness while maintaining low heat build-up.
- the CTAB adsorption specific surface area of silica is 180 m 2 /g or more, heat buildup deteriorates.
- the amount of silica compounded is 3 parts by mass to 30 parts by mass, preferably 4 parts by mass to 28 parts by mass, and more preferably 4 parts by mass to 25 parts by mass, based on 100 parts by mass of the rubber component. If the amount of silica is less than 3 parts by mass, the amount of silica is too small and the effect due to silica cannot be sufficiently expected. If the silica content exceeds 30 parts by mass, heat build-up deteriorates.
- the total amount of filler compounded is preferably 70 parts by mass or less, more preferably 40 to 60 parts by mass. Reducing the total amount of filler compounded in this way is advantageous for improving heat build-up. If the total amount of filler compounded exceeds 75 parts by mass, there is a risk that the heat buildup will deteriorate.
- the weight ratio of silica to carbon black is preferably set to 0.03 to 0.5, more preferably 0.08 to 0.3. By setting the weight ratio in this way, the balance between carbon black and silica is improved, which is advantageous for improving rubber hardness while maintaining low heat build-up. If the weight ratio is out of the above range, the effect of increasing rubber hardness while maintaining low heat build-up cannot be obtained. In particular, when the weight ratio of silica is excessive, there is a possibility that heat build-up may deteriorate.
- the rubber composition of the present invention can contain inorganic fillers other than carbon black.
- inorganic fillers include materials commonly used in rubber compositions for tires, such as clay, talc, calcium carbonate, mica, and aluminum hydroxide.
- a silane coupling agent may be used in combination with the silica described above.
- a silane coupling agent By adding a silane coupling agent, the dispersibility of silica in the diene rubber can be improved.
- the type of silane coupling agent is not particularly limited as long as it can be used in silica-blended rubber compositions.
- Sulfur-containing silane coupling agents such as triethoxysilylpropyl)disulfide, 3-trimethoxysilylpropylbenzothiazole tetrasulfide, ⁇ -mercaptopropyltriethoxysilane, 3-octanoylthiopropyltriethoxysilane can be exemplified. .
- the amount of the silane coupling agent compounded is preferably 15% by mass or less, more preferably 3% to 12% by mass, based on the weight of silica. If the compounded amount of the silane coupling agent exceeds 15% by mass of the silica compounded amount, the silane coupling agents condense with each other, and the desired hardness and strength cannot be obtained in the rubber composition.
- the rubber composition for tires of the present invention preferably contains an amine anti-aging agent and/or wax. By blending these, crack resistance and workability can be improved.
- the amount of the amine antioxidant is preferably 1.0 to 4.0 parts by mass, more preferably 1.5 to 3.5 parts by mass, per 100 parts by mass of the rubber component.
- the amount of the wax compounded 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.
- the amine anti-aging agent and wax may be blended alone or in combination.
- the amount of the amine anti-aging agent is less than 1.0 part by mass, the effect of improving the crack resistance and workability cannot be expected, and the crack resistance in particular decreases. If the amount of the amine anti-aging agent exceeds 4.0 parts by mass, the processability will deteriorate. If the amount of wax compounded exceeds 2.0 parts by mass, the workability is lowered.
- Amine antioxidants include N-phenyl N'-(1,3-dimethylbutyl)-p-phenylenediamine, alkylated diphenylamine, 4,4'-bis( ⁇ , ⁇ -dimethylbenzyl)diphenylamine, N, N'-diphenyl-p-phenylenediamine, N-phenyl-N'-isopropyl-p-phenylenediamine, p-(p-toluenesulfonylamido)diphenylamine, N-phenyl-N'-(3-methacryloyloxy-2 -hydroxypropyl)-p-phenylenediamine, 2,2,4-trimethyl-1,2-dihydroquinoline polymers and the like, particularly N-phenyl N'-(1,3-dimethylbutyl) -p-phenylenediamine can be preferably used.
- the content A of the amine-based antioxidant in the cap tread below the circumferential groove is preferably It is more than 0.8% by mass and less than 2.0% by mass
- the content B of the amine anti-aging agent in the undertread at the groove lower position of the circumferential groove is preferably more than 0.7% by mass and less than 1.5% by mass.
- the ratio B/A between the content A and the content B is preferably 0.6 or more and 1.2 or less, more preferably 0.7 to 1.2, and still more preferably 0.8 to 1.2. 2.
- the physical properties of the undertread are improved, so it is advantageous for improving steering stability and durability (especially durability against groove cracks) while reducing rolling resistance.
- the ratio B/A is less than 0.6, the amount of anti-aging agent at the bottom of the groove is reduced, which may reduce the durability (groove crack resistance). If the ratio B/A exceeds 1.2, the water-resistant adhesiveness of the belt may deteriorate.
- an amine-ketone anti-aging agent can be used in combination as a secondary anti-aging agent.
- examples of amine-ketone anti-aging agents include 2,2,4-trimethyl-1,2-dihydroquinoline polymers.
- the amount of the amine-ketone antioxidant is preferably 0.3 parts by mass to 3 parts by mass, more preferably 0.5 parts by mass to 2 parts by mass, per 100 parts by mass of the rubber component.
- the rubber composition for tires of the present invention is mainly used for the undertread, there are no particular restrictions on the compounding of the rubber composition that constitutes the cap tread used in conjunction with the tire.
- the rubber composition constituting the cap tread contains an amine-based antioxidant, and the content B is within the above range. good.
- the rubber composition constituting the cap tread preferably contains wax together with the amine anti-aging agent, and the amount of wax compounded is based on 100 parts by mass of the rubber component in the rubber composition constituting the cap tread. On the other hand, it is preferably 1 part by mass to 4 parts by mass.
- the amount of the amine anti-aging agent compounded in the rubber composition constituting the cap tread is preferably 0.8 to 1.5 times the amount of the wax compounded. If the amount of wax compounded in the rubber composition constituting the cap tread is small, the weather resistance may be lowered, and if the amount of wax compounded is large, the appearance may deteriorate.
- sulfur is preferably 2.5 parts by mass to 5.0 parts by mass, more preferably 3.0 parts by mass to 4.5 parts by mass, relative to 100 parts by mass of the rubber component. It is preferable to mix parts by mass.
- the amount of sulfur compounded is the amount of pure sulfur excluding the amount of oil. By blending sulfur in this way, the physical properties of the rubber after vulcanization can be improved. If the sulfur content is less than 2.5 parts by mass, the desired hardness may not be obtained. If the sulfur content is more than 5.0 parts by mass, the fatigue resistance may deteriorate.
- Compounding agents other than those mentioned above can be added to the rubber composition for tires of the present invention.
- Other ingredients include reinforcing fillers other than carbon black and silica, vulcanizing or cross-linking agents, vulcanization accelerators, anti-aging agents other than amines and amine-ketones, liquid polymers, thermosetting
- Various compounding agents generally used for pneumatic tires, such as resins and thermoplastic resins can be exemplified.
- the blending amount of these compounding agents can be a conventional general blending amount as long as it does not contradict the object of the present invention.
- a kneader a general rubber kneader such as a Banbury mixer, a kneader, or a roll can be used.
- the rubber composition for tires of the present invention can be produced by a general production method using the kneader described above.
- the release temperature during kneading is preferably 120°C to 165°C, more preferably 130°C to 160°C, and still more preferably 135°C to 155°C.
- the release temperature is high, especially when an amine antioxidant is used, the amine antioxidant is deactivated by heat, and the content of the amine antioxidant in the finally obtained rubber composition decreases. It is feared that it will decrease.
- an amine anti-aging agent in order to ensure the content of the amine anti-aging agent, multiple mixing steps are performed without adding a vulcanizing agent, and in the final step, the amine anti-aging agent is added. It is preferable to mix agents.
- the tire rubber composition of the present invention When the tire rubber composition of the present invention is used for a tire, the tire can be manufactured by a general manufacturing method.
- the vulcanization temperature is preferably 145°C to 170°C, more preferably 150°C to 160°C.
- the hardness at 20°C of the rubber composition for tires of the present invention composed of such a blend is 60-65, preferably 62-65.
- the tensile stress (M100) of the rubber composition for tires of the present invention at 100° C. and 100% elongation is 2.0 MPa to 4.0 MPa, preferably 2.3 MPa to 3.5 MPa.
- the product (TB ⁇ EB) of the tensile breaking strength TB [unit: MPa] at 100° C. and the breaking elongation EB [unit: %] at 100° C. of the rubber composition for tires of the present invention is 2000 or more, preferably 2200-5500.
- the rubber composition for tires of the present invention has such physical properties, it is possible to improve steering stability and durability when made into a tire while reducing rolling resistance. If the hardness is less than 60, the steering stability of the tire will deteriorate. If the hardness exceeds 65, the rolling resistance cannot be reduced. If the tensile stress (M100) is less than 2.0 MPa, the steering stability of the tire deteriorates. If the tensile stress (M100) exceeds 4.0 MPa, rolling resistance cannot be reduced. If the product (TB ⁇ EB) is less than 2000, high-speed durability is lowered.
- the rubber composition for tires of the present invention has a loss tangent (tan ⁇ (60° C.)) at 60° C. of preferably 0.07 or less, more preferably 0.02 to 0.06.
- tan ⁇ (60° C.) a loss tangent at 60° C. of preferably 0.07 or less, more preferably 0.02 to 0.06.
- the rubber composition for tires of the present invention can improve steering stability and durability when made into a tire while reducing rolling resistance.
- a specific butadiene rubber is used in combination, and carbon black with a large particle size and silica are blended in appropriate amounts as fillers, so when used in a tire
- a specific butadiene rubber having the properties described above when low heat generation is attempted using carbon black or silica having a large particle size, the hardness of the rubber decreases, resulting in a decrease in steering stability and durability. can be prevented.
- the above-described compounding makes it easier to achieve the above-described rubber physical properties, making it possible to maintain excellent steering stability and durability. Their cooperation can improve the aforementioned performance in a balanced manner. Therefore, the rubber composition for tires of the present invention is preferably used for the undertread 11U of the tire, and the tire using the rubber composition for tires of the present invention for the undertread 11U has excellent steering stability and durability. Fuel consumption performance can be improved while maintaining.
- a tire using the rubber composition for a tire of the present invention in the undertread 11U (hereinafter referred to as the tire of the present invention) has, as shown in FIG. 20.
- the under-groove gauge under the circumferential groove 20 (the thickness of the tread rubber layer 11 radially inside the groove bottom of the circumferential groove in the tire meridian cross section, rubber gauges G U and G to be described later) C ) is G T
- the rubber gauge of the cap tread 11C under the circumferential groove (the thickness of the cap tread 11C radially inside the groove bottom of the circumferential groove in the tire meridian cross section) is G C
- the under-groove gauge G T is preferably 2.5 mm or less, more preferably 1.5 mm to 2.3 mm
- the ratio G U /G C is preferably 0.3 to 0.8, more preferably 0.4 to 0.7, still more preferably 0.5 to 0.7.
- G T , G U , and G C are the thickness of each rubber layer (each rubber) measured perpendicularly to the surface of the belt layer 7 on the tire outer peripheral side.
- the cross-sectional area of the undertread in the tire meridian cross section is preferably 0.15 of the cross-sectional area of the tread rubber layer 11 in the tire meridian cross section (the sum of the cross-sectional area of the undertread 11U and the cross-sectional area of the cap tread 11C). It is preferably 0.20 to 0.35 times, more preferably 0.20 to 0.35 times. This improves the balance between the tread rubber layer 11 and the cap tread 11C and undertread 11U, which is advantageous for improving steering stability and durability (especially durability against groove cracks) while reducing rolling resistance. become.
- the tire size is 245 / 45ZR18 and has the basic structure shown in FIG. C ), the vulcanization temperature, and the contents A, B and the ratio B/A of the amine-based antioxidant in the unrunning tire were set as shown in Tables 1 to 3 Standard Example 1, Comparative Examples 1 to 9, Tires of Examples 1-11 were produced.
- the vulcanization time was 15 minutes in common for all examples.
- the physical properties of the rubber composition include hardness, tensile stress at 100% elongation at 100°C (hereinafter referred to as "M100 (100°C)”), tensile strength at 100°C Breaking strength TB (hereinafter, “TB (100° C.)”), breaking elongation at 100° C. EB (hereinafter, “EB (100° C.)”), and product TB ⁇ EB were set.
- M100 (100°C) tensile stress at 100% elongation at 100°C
- TB (100° C.) tensile strength at 100°C Breaking strength TB
- EB (100° C.) breaking elongation at 100° C.
- product TB ⁇ EB breaking elongation at 100° C.
- the hardness was measured at a temperature of 20°C with a durometer type A in accordance with JIS K6253.
- M100 (100°C) was measured using a No.
- the contents A and B of the amine-based antioxidant in the unrunning tire are the content A of the amine-based antioxidant in the cap tread at the groove-lower position of the circumferential groove and the under-groove position of the circumferential groove. It is the content B of the amine anti-aging agent in the tread, and was measured by gas chromatography according to JIS K6229 and JIS K0114.
- the tire of each example was dismantled, and after thinly slicing the cap tread and undertread at the groove lower position of the circumferential groove, a test piece of 1 mm square and about 30 mm in length and extracted with acetone for 8 hours, the resulting filtrate was returned to room temperature and used as a gas chromatograph measurement sample, and the amine anti-aging agent to be measured was shaken at 4 points in the range of 100 ppm to 1000 ppm.
- a solution standard sample
- the area of the resulting gas chromatograph measurement sample was determined, and the content of the amine antioxidant in the gas chromatograph measurement sample was calculated from the calibration curve.
- the obtained rubber composition was evaluated for steering stability, rolling resistance, high-speed durability, and groove crack resistance by the methods shown below.
- Steering stability Mount each test tire on a wheel with a rim size of 18 x 8.5J, set the air pressure to 240 kPa, and mount it on a test vehicle with a displacement of 2000 cc. A sensory evaluation was performed. The evaluation results were evaluated on a scale of 5, with the result of Standard Example 1 being 3 points (reference). A higher score means better steering stability.
- Rolling resistance Each test tire is mounted on a 18 x 7J wheel, and an indoor drum tester (drum diameter: 1707.6 mm) is used to comply with ISO 28580 under the conditions of air pressure of 210 kPa, load of 4.82 kN, and speed of 80 km/h. to measure the rolling resistance.
- the evaluation results are shown as an index with the measured value of Standard Example 1 set to 100. A smaller index value means a lower rolling resistance.
- ⁇ NR natural rubber
- TSR20 BR1 Butadiene rubber
- Nipol BR1220 manufactured by Nippon Zeon Co., Ltd.
- cis-1,4 bond content 98%, Mooney viscosity ML 1+4 at 100°C: 43, 5 mass% toluene solution viscosity Tcp at 25°C: 60. 2 cps, ratio Tcp/ML 1+4 : 1.4
- BR2 Terminal-modified butadiene rubber, Nipol BR1250H manufactured by Nippon Zeon Co., Ltd.
- BR4 Butadiene rubber, UBEPOL BR150L manufactured by Ube Industries (cis-1,4 bond content: 98%, Mooney viscosity ML 1+4 at 100°C: 43, 5 mass% toluene solution viscosity Tcp at 25°C: 120.
- BR5 Butadiene rubber, UBEPOL BR360L manufactured by Ube Industries (cis-1,4 bond content: 98%, Mooney viscosity ML 1+4 at 100°C: 47, 5 mass% toluene solution viscosity Tcp at 25°C: 131. 6 cps, ratio Tcp/ML 1+4 : 2.8)
- IR Isoprene rubber, Nipol IR2200 manufactured by Nippon Zeon Co., Ltd.
- SBR Nipol 1502 manufactured by Nippon Zeon Co., Ltd.
- CB1 carbon black, Seast 3 manufactured by Tokai Carbon Co., Ltd. (CTAB adsorption specific surface area: 82 m 2 /g)
- CB2 Carbon black, Seast F manufactured by Tokai Carbon Co., Ltd.
- Anti-aging agent Amine-based anti-aging agent, Santoflex 6PPD manufactured by Flexis ⁇ Stearic acid: Shinnichi Rika stearic acid 50S ⁇ Sulfur: Insoluble sulfur, Myucron OT-20 manufactured by Shikoku Chemical Industry Co., Ltd. ⁇ Vulcanization accelerator: NS-G manufactured by Sanshin Chemical Industry Co., Ltd.
- the butadiene rubber compounded in the rubber composition constituting the undertread was a terminal-modified butadiene rubber, and the cis-1,4 bond content was low. groove crack resistance) deteriorated.
- the Mooney viscosity ML 1+4 of the butadiene rubber compounded in the rubber composition constituting the undertread is small and the ratio Tcp/ML 1+4 is large, so the rolling resistance can be reduced.
- the durability (groove crack resistance under low temperature conditions) deteriorated.
- the carbon black contained in the rubber composition forming the undertread had a large CTAB adsorption specific surface area, so the rolling resistance deteriorated.
- the durability (groove crack resistance under high temperature conditions and low temperature conditions) was lowered because the CTAB adsorption specific surface area of silica compounded in the rubber composition constituting the undertread was large.
- the tire of Comparative Example 6 contained a small amount of carbon black in the rubber composition constituting the undertread, the effect of improving the durability was not obtained, and the steering stability was lowered.
- the tire of Comparative Example 7 contained a large amount of carbon black in the rubber composition constituting the undertread, rolling resistance and high-speed durability were deteriorated.
- the tire of Comparative Example 8 had poor rolling resistance because the amount of butadiene rubber compounded in the rubber composition constituting the undertread was small. Since the tire of Comparative Example 9 contained a large amount of butadiene rubber in the rubber composition constituting the undertread, durability (high-speed durability, resistance to groove cracking under high and low temperature conditions) was deteriorated.
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Abstract
Description
各試験タイヤをリムサイズ18×8.5Jのホイールに組み付けて、空気圧を240kPaとし、排気量2000ccの試験車両に装着し、舗装路面からなるテストコースにて、操縦安定性についてテストドライバーによる官能評価を行った。評価結果は、標準例1の結果を3点(基準)とする5段階で評価した。この点数が大きいほど操縦安定性が優れていることを意味する。
各試験タイヤを18×7Jのホイールに組み付けて、室内ドラム試験機(ドラム径:1707.6mm)を用いて、ISO28580に準拠し、空気圧210kPa、荷重4.82kN、速度80km/hの条件で転がり抵抗を測定した。評価結果は、標準例1の測定値を100とする指数で示した。この指数値が小さいほど転がり抵抗が低いことを意味する。
各試験タイヤを18×7Jのホイールに組み付けて、空気圧を230kPaとし、室内ドラム試験機(ドラム径:1707mm)を用いて、JIS D4230に準拠して高速耐久性試験を実施した後、引き続き1時間毎に8km/hずつ速度を増加させ、タイヤに故障が生じるまでの走行距離を測定した。評価結果は、標準例1の測定値を100とする指数で示した。この指数値が大きいほど高速耐久性に優れることを意味する。
各試験タイヤを18×7Jのホイールに組み付けて、空気圧を230kPaとし、温度50℃、オゾン濃度100phmの条件で24時間の曝露試験を行い、試験後に溝底に発生したクラックの数を測定した。評価結果は、測定値の逆数を用いて、標準例1を100とする指数で示した。この指数値が大きいほどクラック数が少なく耐グルーブクラック性に優れることを意味する。
各試験タイヤを18×7Jのホイールに組み付けて、空気圧を230kPaとし、温度0℃、オゾン濃度100phmの条件で24時間の曝露試験を行い、試験後に溝底に発生したクラックの数を測定した。評価結果は、測定値の逆数を用いて、標準例1を100とする指数で示した。この指数値が大きいほどクラック数が少なく耐グルーブクラック性に優れることを意味する。
・NR:天然ゴム、TSR20
・BR1:ブタジエンゴム、日本ゼオン社製 Nipol BR1220(シス-1,4結合含有率:98%、100℃におけるムーニー粘度ML1+4:43、25℃における5質量%トルエン溶液粘度Tcp:60.2cps、比Tcp/ML1+4:1.4)
・BR2:末端変性ブタジエンゴム、日本ゼオン社製 Nipol BR1250H(シス-1,4結合含有率:35%、100℃におけるムーニー粘度ML1+4:59)
・BR3:ブタジエンゴム、宇部興産社製 UBEPOL BR230(シス-1,4結合含有率:98%、100℃におけるムーニー粘度ML1+4:38、25℃における5質量%トルエン溶液粘度Tcp:117.8cps、比Tcp/ML1+4:3.1)
・BR4:ブタジエンゴム、宇部興産社製 UBEPOL BR150L(シス-1,4結合含有率:98%、100℃におけるムーニー粘度ML1+4:43、25℃における5質量%トルエン溶液粘度Tcp:120.4cps、比Tcp/ML1+4:2.8)
・BR5:ブタジエンゴム、宇部興産社製 UBEPOL BR360L(シス-1,4結合含有率:98%、100℃におけるムーニー粘度ML1+4:47、25℃における5質量%トルエン溶液粘度Tcp:131.6cps、比Tcp/ML1+4:2.8)
・IR:イソプレンゴム、日本ゼオン社製 Nipol IR2200
・SBR:日本ゼオン社製 Nipol 1502
・CB1:カーボンブラック、東海カーボン社製 シースト3(CTAB吸着比表面積:82m2/g)
・CB2:カーボンブラック、東海カーボン社製 シーストF(CTAB吸着比表面積:47m2/g)
・シリカ1:Evonick Japan社製 Ultrasil VN3(CTAB吸着比表面積:175m2/g)
・シリカ2:Solvay Japan社製 Zeosil premium 200MP(CTAB吸着比表面積:200m2/g)
・シランカップリング剤:Evonick Japan社製 Si69
・タッキファイヤー:日立化成社製 ヒタノール1502Z
・酸化亜鉛:正同化学工業社製 酸化亜鉛3種
・老化防止剤:アミン系老化防止剤、フレキシス社製 サントフレックス6PPD
・ステアリン酸:新日理化社製 ステアリン酸50S
・硫黄:不溶性硫黄、四国化成工業社製 ミュークロンOT‐20
・加硫促進剤:三新化学工業社製 NS‐G
2 サイドウォール部
3 ビード部
4 カーカス層
5 ビードコア
6 ビードフィラー
7 ベルト層
8 ベルト補強層
11 トレッドゴム層
11C キャップトレッド
11U アンダートレッド
12 サイドゴム層
13 リムクッションゴム層
20 周方向溝
CL タイヤ赤道
Claims (9)
- 天然ゴム50質量%以上とブタジエンゴム10質量%~40質量%とを含むゴム成分100質量部に対して、CTAB吸着比表面積が70m2/g未満であるカーボンブラック35質量部~60質量部と、CTAB吸着比表面積が180m2/g未満であるシリカ3質量部~30質量部とが配合されたタイヤ用ゴム組成物であって、
前記ブタジエンゴムは、シス-1,4結合含有率が97%以上であり、100℃におけるムーニー粘度ML1+4が45以上であり、25℃における5質量%トルエン溶液粘度Tcp〔単位:cps〕と前記ムーニー粘度ML1+4との比Tcp/ML1+4が2.0~3.0である未変性のブタジエンゴムであることを特徴とするタイヤ用ゴム組成物。 - 前記ゴム成分が更にイソプレンゴムまたはスチレンブタジエンゴムを含むことを特徴とする請求項1に記載のタイヤ用ゴム組成物。
- 20℃における硬度が60~65、100℃における100%伸長時の引張応力(M100)が2.0MPa~4.0MPa、100℃における引張破断強さTB〔単位:MPa〕と100℃における破断伸びEB〔単位:%〕との積(TB×EB)が2000以上であることを特徴とする請求項1または2に記載のタイヤ用ゴム組成物。
- タイヤ周方向に延在して環状をなすトレッド部を備え、前記トレッド部の踏面を構成するキャップトレッドとその内周側に配置されるアンダートレッドとを有するタイヤであって、前記アンダートレッドが請求項1~3のいずれかに記載のタイヤ用ゴム組成物で構成されたことを特徴とするタイヤ。
- 前記トレッド部に形成された周方向溝の溝下における溝下ゲージGTが2.5mm以下であることを特徴とする請求項4に記載のタイヤ。
- 前記周方向溝の溝下における前記キャップトレッドのゴムゲージGCと前記アンダートレッドのゴムゲージGUとの比GU/GCが0.3~0.8であることを特徴とする請求項5に記載のタイヤ。
- 前記ゴム成分100質量部に対してアミン系老化防止剤が1.0質量部~4.0質量部配合されたことを特徴とする請求項4~6のいずれかに記載のタイヤ。
- 前記周方向溝の溝下位置の前記キャップトレッドにおける前記アミン系老化防止剤の含有量Aが0.8質量%超2.0質量%未満であり、前記周方向溝の溝下位置の前記アンダートレッドにおける前記アミン系老化防止剤の含有量Bが0.7質量%超1.5質量%未満であり、且つ、前記含有量Aと前記含有量Bとの比B/Aが0.6以上1.2以下であることを特徴とする請求項7に記載のタイヤ。
- 請求項4~8のいずれかに記載のタイヤの製造方法であって、加硫温度が145℃~170℃であることを特徴とするタイヤの製造方法。
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JPH1036559A (ja) * | 1996-04-22 | 1998-02-10 | Sumitomo Rubber Ind Ltd | タイヤサイドウォール用ゴム組成物およびタイヤ |
JP2014084312A (ja) * | 2012-10-25 | 2014-05-12 | Sumitomo Chemical Co Ltd | 加硫ゴムの粘弾性特性を改善するための化合物及び該化合物を含んでなるゴム組成物 |
WO2019012945A1 (ja) * | 2017-07-14 | 2019-01-17 | 株式会社ブリヂストン | ゴム組成物及びタイヤ |
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JP5445638B2 (ja) * | 2012-08-02 | 2014-03-19 | 横浜ゴム株式会社 | タイヤリムクッションまたはガムフィニッシング用ゴム組成物およびそれを用いた空気入りタイヤ |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH1036559A (ja) * | 1996-04-22 | 1998-02-10 | Sumitomo Rubber Ind Ltd | タイヤサイドウォール用ゴム組成物およびタイヤ |
JP2014084312A (ja) * | 2012-10-25 | 2014-05-12 | Sumitomo Chemical Co Ltd | 加硫ゴムの粘弾性特性を改善するための化合物及び該化合物を含んでなるゴム組成物 |
WO2019012945A1 (ja) * | 2017-07-14 | 2019-01-17 | 株式会社ブリヂストン | ゴム組成物及びタイヤ |
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