WO2015182078A1 - Pneumatique pour chargement lourd - Google Patents

Pneumatique pour chargement lourd Download PDF

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Publication number
WO2015182078A1
WO2015182078A1 PCT/JP2015/002542 JP2015002542W WO2015182078A1 WO 2015182078 A1 WO2015182078 A1 WO 2015182078A1 JP 2015002542 W JP2015002542 W JP 2015002542W WO 2015182078 A1 WO2015182078 A1 WO 2015182078A1
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WIPO (PCT)
Prior art keywords
rubber
mass
parts
pneumatic tire
mpa
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PCT/JP2015/002542
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English (en)
Japanese (ja)
Inventor
雄介 多鹿
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株式会社ブリヂストン
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Priority to CN201580004124.XA priority Critical patent/CN105899375B/zh
Priority to JP2016523128A priority patent/JP6620089B2/ja
Publication of WO2015182078A1 publication Critical patent/WO2015182078A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/10—Esters; Ether-esters
    • C08K5/101—Esters; Ether-esters of monocarboxylic acids
    • C08K5/103—Esters; Ether-esters of monocarboxylic acids with polyalcohols
    • 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
    • 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
    • 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
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/34—Heterocyclic compounds having nitrogen in the ring
    • C08K5/3442—Heterocyclic compounds having nitrogen in the ring having two nitrogen atoms in the ring
    • C08K5/3445—Five-membered rings
    • C08K5/3447—Five-membered rings condensed with carbocyclic rings
    • 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
    • C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
    • C08K5/37—Thiols
    • C08K5/378—Thiols containing heterocyclic rings
    • 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
    • B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
    • B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
    • B60C2011/0016—Physical properties or dimensions
    • B60C2011/0025—Modulus or tan delta
    • 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
    • B60C11/0008—Tyre tread bands; Tread patterns; Anti-skid inserts characterised by the tread rubber
    • B60C2011/0016—Physical properties or dimensions
    • B60C2011/0033—Thickness of the tread
    • 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
    • B60C2200/00—Tyres specially adapted for particular applications
    • B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles

Definitions

  • the present invention relates to a heavy duty pneumatic tire.
  • Patent Document 1 includes a tread rubber in which a boundary surface between a cap rubber layer and a base rubber layer is disposed radially outward from the bottom of the main groove, and the base rubber layer has a specific blending amount of natural rubber or butadiene rubber. It has been reported that a heavy-duty pneumatic tire containing a rubber component consisting of: and containing carbon black and silica at a specific compounding ratio is excellent in low rolling resistance and the like.
  • Patent Document 2 includes a tread rubber in which a boundary surface between a cap rubber layer and a base rubber layer is disposed radially outward from the bottom of the main groove, and each of the cap rubber layer and the base rubber layer has a specific blending amount. It has been reported that heavy duty pneumatic tires that contain fillers (carbon black, silica) and the amount of silica in the base rubber layer is greater than the amount of silica in the cap rubber layer are excellent in heat generation durability. ing.
  • fillers carbon black, silica
  • an object of the present invention is to provide a heavy duty pneumatic tire that achieves both low rolling resistance and crack resistance at a high level.
  • the present inventor has intensively studied to achieve the above object.
  • the inventor includes a tread rubber composed of a cap rubber and a base rubber, and a tread undercushion rubber, and the ratio of the storage elastic modulus at 2% strain at 25 ° C. between the cap rubber and the base rubber is within a specific range.
  • Pneumatic tires with a difference between the storage elastic modulus at 0.1% strain at 25 ° C. and the storage elastic modulus at 2% strain ( ⁇ E ′) within a specific range are low.
  • the inventors have newly found that rolling resistance and crack resistance can be achieved at a high level, and have completed the present invention.
  • the present invention aims to advantageously solve the above-mentioned problems, and the heavy-duty pneumatic tire of the present invention comprises a base rubber and a cap rubber positioned on the outer side in the tire radial direction of the base rubber.
  • E b2% '/ E c2% ' is 1.1 or more and 1.7 or less, and
  • the base rubber preferably includes natural rubber. This is because if the base rubber includes natural rubber, the crack resistance of the heavy duty pneumatic tire can be sufficiently improved.
  • the base rubber contains carbon black in an amount of 20 parts by mass or more and 60 parts by mass or less per 100 parts by mass of the rubber component, and silica is contained in 5 parts by mass of the rubber component. It is preferable to contain not less than 50 parts by mass. This is because if the base rubber contains carbon black and silica in a content within the above range, the low rolling resistance and crack resistance of the heavy duty pneumatic tire can be sufficiently improved.
  • the base rubber contains a compound having a guanidine structure and a functional group that reacts with a diene rubber in an amount of 0.3 parts by mass or more per 100 parts by mass of the rubber component. It is preferable to contain 0.0 part by mass or less. If the base rubber contains a compound having a guanidine structure with a content within the above range and a functional group that reacts with a diene rubber, the low rolling resistance of a heavy duty pneumatic tire can be sufficiently improved. Because it can.
  • the base rubber preferably contains glycerin fatty acid ester in an amount of 0.3 parts by mass or more and 3.0 parts by mass or less per 100 parts by mass of the rubber component. If the base rubber contains a glycerin fatty acid ester in a content within the above range, the base rubber has an appropriate viscosity when unvulcanized while maintaining the low rolling resistance of the heavy-duty pneumatic tire. This is because workability at the time of producing rubber and tires can be improved.
  • the tread rubber gauge at the tire center portion is preferably 11 mm or more, and the base rubber ratio in the tread rubber gauge is preferably 1% or more and 70% or less. If the tread rubber gauge is equal to or greater than the above lower limit and the base rubber ratio is within the above range, the progress of cracks in the belt layer can be sufficiently suppressed, and the strain suppression effect of the tread rubber is improved, and heavy load air It is because the crack resistance of the entering tire can be improved.
  • 1 is a cross-sectional view in the width direction of a typical heavy duty pneumatic tire according to the present invention. 1 is a sectional view in the tire width direction of a tread rubber of a typical heavy duty pneumatic tire according to the present invention (near a tire center portion).
  • FIG. 1 schematically shows a cross-sectional structure in the tire width direction of a pneumatic tire according to the present invention.
  • a heavy-duty pneumatic tire 11 includes a tread rubber 1 comprising a base rubber 2 and a cap rubber 3 positioned on the outer side in the tire radial direction of the base rubber 2 (not shown in FIG. 1). ) In the tread portion 6, and further includes a tread undercushion rubber 10 positioned inside the tread rubber 1 in the tire radial direction.
  • a single layer extending in a toroid shape extends across the pair of bead portions 4, the pair of sidewall portions 5 and the tread portion 6 in which the bead core 7 is embedded.
  • a carcass 8 made of a carcass ply (one layer in FIG. 1, but one or more may be sufficient), a tire radial direction outer side of the crown portion of the carcass 8, and a tire radial direction inner side of the tread undercushion rubber.
  • a belt 9 (three layers in FIG. 1, but one or more layers may be sufficient).
  • the tread rubber gauge (tread rubber thickness) at the tire center C is preferably 11 mm or more, more preferably 15 mm or more. Preferably it is 20 mm or more.
  • the upper limit of the tread rubber gauge at the tire center is not particularly limited, but is usually 100 mm or less.
  • the ratio of the base rubber gauge (base rubber thickness) in the tread rubber gauge in the tire center portion is preferably 1% or more, more preferably 3% or more, particularly Preferably it is 5% or more, preferably 70% or less, more preferably 65% or less, and particularly preferably 60% or less.
  • the ratio (E b2% '/ E c2% ') to c2% '(MPa) is 1.1 or more and 1.7 or less
  • the storage elastic modulus E of the base rubber at 0.1% strain at 25 ° C is E
  • the difference ⁇ E ′ between the b0.1% ′ (MPa) and the storage elastic modulus E b2% ′ (MPa) at 2% strain is 0.30 MPa or more and 18.0 MPa or less.
  • the base rubber and the cap rubber have the above-mentioned properties, so that the heavy duty pneumatic tire of the present invention is excellent. In addition, low rolling resistance and crack resistance can be achieved.
  • E b2% '/ E c2% ' is required to be 1.1 or more, preferably 1.2 or more and 1.7 or less. Preferably 1.5 or less. If E b2% '/ E c2% ' is less than 1.1, the crack resistance of the heavy duty pneumatic tire deteriorates, and if it exceeds 1.7, the crack resistance similarly deteriorates.
  • E b2% '/ E c2% ' of the base rubber can be calculated by the method described in the examples of the present specification.
  • the base rubber E b2% ′ and the cap rubber E c2% ′ are, for example, carbon black content, nitrogen adsorption specific surface area, silica content, BET specific surface area, silane coupling agent content, and It can be adjusted as appropriate by changing the amount of compound A (compound having a guanidine structure and having a functional group that reacts with a diene rubber).
  • the above ⁇ E ′ (MPa) needs to be 0.30 MPa or more, preferably 0.70 MPa or more, more preferably 1.0 MPa or more,
  • the pressure is particularly preferably 1.3 MPa or more and 18.0 MPa or less, preferably 10.0 MPa or less, more preferably 6.0 MPa or less, and particularly preferably 4.0 MPa or less.
  • ⁇ E ′ of the base rubber is less than 0.30 MPa, the crack resistance of the heavy duty pneumatic tire is deteriorated.
  • ⁇ E ′ of the base rubber is larger than 18.0 MPa, the low rolling resistance of the heavy duty pneumatic tire cannot be ensured.
  • the ⁇ E ′ of the base rubber can be calculated by the method described in the examples of this specification.
  • ⁇ E ′ of the base rubber is, for example, carbon black content, nitrogen adsorption specific surface area, silica content, BET specific surface area, silane coupling agent content, and compound A (having a guanidine structure and It can adjust suitably by changing the compounding quantity of the compound which has a functional group which reacts with a diene rubber.
  • the rubber component contained in the base rubber is not particularly limited, but it is preferable to contain a diene rubber.
  • the diene rubber include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene butadiene rubber (SBR), chloroprene rubber (CR), acrylonitrile butadiene rubber (NBR), and the like.
  • the base rubber preferably contains natural rubber. When the base rubber contains natural rubber, the crack resistance of the heavy duty pneumatic tire can be improved.
  • the content ratio of the natural rubber in the rubber component in the base rubber is preferably 50% by mass or more, more preferably 80% by mass or more, and particularly preferably 100% by mass.
  • the crack resistance of the heavy duty pneumatic tire can be improved.
  • the base rubber preferably contains a filler such as carbon black or silica.
  • the carbon black used for the base rubber has a nitrogen adsorption specific surface area (measured in accordance with N 2 SA, JIS K 6217-2: 2001), preferably 40 m 2 / g or more, more preferably 60 m 2 / g or more. It is preferably 150 m 2 / g or less, more preferably 130 m 2 / g or less.
  • the nitrogen adsorption specific surface area of carbon black is 40 m 2 / g or more, the crack resistance of heavy duty pneumatic tires can be improved, and when it is 150 m 2 / g or less, the dispersibility of carbon black can be improved. Can be secured.
  • the silica used for the base rubber preferably has a BET specific surface area (measured in accordance with ISO 5794/1) of preferably 150 m 2 / g or more, more preferably 200 m 2 / g or more, and preferably 250 m 2. / G or less, more preferably 300 m 2 / g or less.
  • a BET specific surface area measured in accordance with ISO 5794/1
  • the nitrogen adsorption specific surface area of silica is 150 m 2 / g or more, the crack resistance of heavy duty pneumatic tires can be improved, and when it is 300 m 2 / g or less, the dispersibility of silica is ensured. be able to.
  • the base rubber contains silica, preferably 5 parts by mass or more, more preferably 10 parts by mass or more, preferably 50 parts by mass or less, more preferably 30 parts by mass or less, per 100 parts by mass of the rubber component.
  • silica preferably 5 parts by mass or more, more preferably 10 parts by mass or more, preferably 50 parts by mass or less, more preferably 30 parts by mass or less, per 100 parts by mass of the rubber component.
  • the base rubber preferably contains both carbon black and silica.
  • carbon black and silica By using carbon black and silica in combination, it is possible to achieve both excellent crack resistance and low rolling resistance.
  • the total amount of the base rubber filler is preferably larger than the total amount of the cap rubber filler. Thereby, excellent crack resistance can be obtained.
  • the base rubber preferably contains a compound having a guanidine structure represented by the following formula (I) and having a functional group that reacts with the diene rubber (hereinafter referred to as “compound A” as appropriate).
  • the guanidine structure represented by the above formula (I) effectively reacts with the filler, and in cooperation with the functional group that reacts with the diene rubber, enhances the chemical interaction between the filler and the rubber component,
  • the storage elastic modulus of the base rubber can be increased, and the crack resistance of the heavy duty pneumatic tire can be improved.
  • This guanidine structure preferably forms a heterocyclic ring represented by the following formula (II-1) or (II-2).
  • the guanidine structure has aromaticity by forming the heterocyclic ring represented by the above formula (II-1) or (II-2), the affinity with the carbon black skeleton is increased, and particularly the compound A and The chemical interaction with carbon black is higher. Thereby, the storage elastic modulus of the base rubber can be increased, and the crack resistance of the heavy duty pneumatic tire can be improved.
  • an aromatic ring may be condensed with the guanidine structure of the above formula (II-1) or (II-2) to form a polycyclic structure.
  • examples of the aromatic ring include 4- to 7-membered rings, and 5-membered and 6-membered rings are preferable.
  • the guanidine structure in Compound A preferably has an amide structure represented by the following formula (III), in which a carbonyl group is directly bonded to a nitrogen atom in the guanidine structure.
  • Compound A has a functional group that reacts with the diene rubber together with the above guanidine structure.
  • the functional group that reacts with the diene rubber is at least one selected from the group consisting of a polysulfide group, a thiol group (also referred to as a mercapto group), a hydrazide group, and a hydrazone group. It is preferable from the viewpoint of reacting in a reactive manner and improving the crack resistance of the base rubber.
  • Compound A includes N, N′-di- (1H-benzoimidazol-2-yl) -2,2′-disulfanediylethanamine, N, N′-di- (1H-benzimidazol-2- Yl) -3,3′-disulfanediyldipropanamide, bis [3- (2-amino-1H-benzoimidazol-1-yl) -3-oxopropyl] disulfane, bis [6- (2-amino) -1H-benzimidazol-1-yl) -6-oxohexyl] disulfane, bis [2- (2,3-diphenylguanidino) ethyl] disulfane, 2-[(1H-benzimidazol-2-yl) amino] aceto Hydrazide, and 2- (2-amino-1H-benzimidazol-1-yl) acetohydrazide, and these may be used alone or in
  • N, N′-di- (1H-benzimidazol-2-yl) -2,2′-disulfanediylethanamine is represented by the following formula (IV).
  • N, N′-di- (1H-benzoimidazol-2-yl) -3,3′-disulfanediyldipropanamide is represented by the following formula (V).
  • 2- (2-amino-1H-benzoimidazol-1-yl) acetohydrazide is represented by the following formula (X).
  • the base rubber preferably contains Compound A per 100 parts by mass of the rubber component, preferably 0.3 parts by mass or more, more preferably 0.5 parts by mass or more, particularly preferably 1.0 parts by mass or more, preferably 3. 0 parts by mass or less, more preferably 2.0 parts by mass or less, and particularly preferably 1.5 parts by mass or less.
  • the base rubber contains a diene rubber and a filler, and the compound A is contained in an amount within the above range, the low rolling resistance of the heavy duty pneumatic tire can be ensured.
  • the base rubber preferably contains a glycerin fatty acid ester.
  • the base rubber contains a glycerin fatty acid ester, the workability of the production of the base rubber and the production of the tire can be improved.
  • the glycerin fatty acid ester include glyceryl monomyristate, glyceryl monostearate, glyceryl monooleate, glyceryl monoisostearate, glyceryl dioleate, and glyceryl palmitate.
  • the base rubber contains glycerin fatty acid ester per 100 parts by mass of the rubber component, preferably 0.3 parts by mass or more, more preferably 0.5 parts by mass or more, particularly preferably 1.0 parts by mass or more, preferably It is 3.0 parts by mass or less, more preferably 2.0 parts by mass or less, and particularly preferably 1.5 parts by mass or less.
  • the base rubber contains the glycerin fatty acid ester within the above range, the base rubber has an appropriate viscosity when not vulcanized while maintaining the low rolling resistance of the heavy duty pneumatic tire. This is because workability at the time of rubber production and tire production can be improved.
  • the base rubber may contain other components other than the rubber component, filler, compound A and glycerin fatty acid ester.
  • examples of other components include sulfur vulcanizing agents, silane coupling agents, stearic acid, anti-aging agents, zinc white, vulcanization accelerators, and hydrazide compounds described in JP-A-10-330549. It is done.
  • the base rubber Ingredients that can be used can be used.
  • the cap rubber preferably contains 20 parts by mass or more, more preferably 30 parts by mass or more, preferably 60 parts by mass or less, more preferably 50 parts by mass of a filler such as carbon black per 100 parts by mass of the rubber component. Contains up to parts by mass.
  • a method for producing a tread rubber made of a base rubber and a cap rubber is not particularly limited, and can be produced by a conventional method.
  • a tread undercushion rubber is disposed on the inner side of the obtained tread rubber in the tire radial direction to provide a heavy duty pneumatic tire of the present invention.
  • the heavy-duty pneumatic tires of Examples 1 to 6 and Comparative Examples 1 to 4 have a tire size of 11R22.5, the structure shown in FIG. 1, the tread rubber gauge of the tire center portion is 22 mm, and the tire center portion The base rubber ratio in the tread rubber gauge was 33%.
  • blending shown in Table 1 and Table 2, respectively was applied to the base rubber and cap rubber which comprise a tread by the combination shown in Table 3 by a conventional method. Tan ⁇ , ⁇ E ′, E b2% ′ / E c2% ′, viscosity, rolling resistance, and crack resistance were measured or calculated by the following methods.
  • ⁇ Tan ⁇ > Loss tangent to vulcanized rubber obtained by vulcanizing rubber composition at a frequency of 52 Hz, initial strain rate of 2%, measurement temperature of 25 ° C. (room temperature), strain of 1% using a spectrometer manufactured by Toyo Seiki Co., Ltd. (Tan ⁇ ) was measured.
  • ⁇ E '> For a vulcanized rubber (base rubber) obtained by vulcanizing the rubber composition, using a spectrometer manufactured by Toyo Seiki Co., Ltd., frequency 52 Hz, initial distortion 2%, measurement temperature 25 ° C.
  • the storage elastic modulus (E b0.1% ', E b2% ') was measured at 1% and 2%, and the difference ( ⁇ E ') was calculated.
  • ⁇ E b2% '/ E c2% '> For a vulcanized rubber (base rubber, cap rubber) obtained by vulcanizing the rubber composition, using a spectrometer manufactured by Toyo Seiki Co., Ltd., frequency 52 Hz, initial distortion 2%, measurement temperature 25 ° C. (room temperature) The storage elastic modulus (E b2% ', E c2% ') was measured at a strain of 2%, and the ratio (E b2% '/ E c2% ') was calculated.
  • ⁇ Viscosity> According to JIS K6300-1994, the Mooney viscosity [ML 1 + 4/130 ° C.] of an unvulcanized rubber composition was measured at 130 ° C.
  • ⁇ Rolling resistance> The rolling resistance during running of the drum at 80 km / h was measured for the molded and vulcanized test tires under normal load and internal pressure, and the value of Comparative Example 1 was set to 100 and displayed as an index in Table 1. It shows that rolling resistance is so small that an index value is small and it is excellent in low rolling resistance.
  • N, N′-di- (1H-benzimidazol-2-yl) -2,2′-disulfanediylethanamine used as Compound A was produced by the following method. To 10.3 g of 2- (2-hydroxyethylamino) benzimidazole was added 80 mL of chloroform and 13.8 g of thionyl chloride, and the mixture was heated to reflux for 6 hours. Distillation under reduced pressure was performed to dryness to obtain 17.3 g of a chloroethyl compound. 60 mL of water and 8.7 g of thiourea were added to 15.1 g of the obtained chloroethyl compound, and the mixture was heated to 90 ° C. and reacted for 1 day.
  • the wet masterbatch of natural rubber and carbon black 2 used for the rubber composition Bf for the base rubber was prepared by mixing the carbon black 2 slurry with the natural rubber latex and then coagulating and drying.
  • the content of carbon black 2 per 100 parts by mass of natural rubber (rubber component) in the wet masterbatch is 35 parts by mass.

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Abstract

La présente invention concerne un pneumatique pour chargement lourd (11) qui est pourvu : d'un caoutchouc de bande de roulement (1) qui se compose d'un caoutchouc de base (2) et d'un caoutchouc de chapeau (3) qui est positionné à l'extérieur du caoutchouc de base dans la direction radiale du pneu; et d'un caoutchouc de bande de roulement sous-coussin (10) qui est positionnée à l'intérieur du caoutchouc de bande de roulement dans la direction radiale du pneumatique. Le rapport module élastique de stockage du caoutchouc de base (2) à une contrainte de 2 % à 25 °C (Eb2%' (MPa)) sur module élastique de stockage du caoutchouc de chapeau (3) à une contrainte de 2 % à 25 °C (Ec2%' (MPa)), à savoir Eb2%'/Ec2% est compris entre 1,1 et 1,7 (inclus), et la différence (∆ E') entre le module élastique de stockage à une contrainte de 0,1 % à 25 °C (Eb0.1%' (MPa)) et le module élastique de stockage à une contrainte de 2 % à 25 °C (Eb2%' (MPa)) du caoutchouc de base (2) est compris entre 0,30 MPa et 18,0 MPa (inclus).
PCT/JP2015/002542 2014-05-27 2015-05-20 Pneumatique pour chargement lourd WO2015182078A1 (fr)

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CN201580004124.XA CN105899375B (zh) 2014-05-27 2015-05-20 重型载重用充气轮胎
JP2016523128A JP6620089B2 (ja) 2014-05-27 2015-05-20 重荷重用空気入りタイヤ

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JP2014-109223 2014-05-27
JP2014109223 2014-05-27

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WO2015182078A1 true WO2015182078A1 (fr) 2015-12-03

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019001864A (ja) * 2017-06-13 2019-01-10 株式会社ブリヂストン タイヤ
WO2019058084A1 (fr) * 2017-09-25 2019-03-28 Compagnie Generale Des Etablissements Michelin Pneu pour vehicule hors-la-route ayant une endurance amelioree
JP2020164689A (ja) * 2019-03-29 2020-10-08 住友ゴム工業株式会社 タイヤ用ゴム組成物及びタイヤ
WO2020255450A1 (fr) * 2019-06-20 2020-12-24 株式会社ブリヂストン Composition de caoutchouc pour bande de roulement de base, et pneumatique
JP2021035802A (ja) * 2019-08-30 2021-03-04 横浜ゴム株式会社 重荷重用空気入りタイヤ
WO2021124811A1 (fr) * 2019-12-18 2021-06-24 株式会社ブリヂストン Composition de caoutchouc, et pneumatique
US20220234388A1 (en) * 2021-01-27 2022-07-28 Sumitomo Rubber Industries, Ltd. Pneumatic tire for heavy load
FR3135223A1 (fr) * 2022-05-09 2023-11-10 Compagnie Generale Des Etablissements Michelin Architecture optimisée de pneumatique de génie civil

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CN110494481B (zh) * 2017-03-31 2021-11-30 米其林集团总公司 包括胎面的轮胎
CN109384971B (zh) * 2018-09-20 2020-01-17 华南农业大学 一种通过酯交换制备的不饱和酯改性的天然乳胶及其制备和应用
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WO2019058084A1 (fr) * 2017-09-25 2019-03-28 Compagnie Generale Des Etablissements Michelin Pneu pour vehicule hors-la-route ayant une endurance amelioree
US11884106B2 (en) 2017-09-25 2024-01-30 Compagnie Generale Des Etablissements Michelin Tire for off-road vehicle having improved endurance
JP2020164689A (ja) * 2019-03-29 2020-10-08 住友ゴム工業株式会社 タイヤ用ゴム組成物及びタイヤ
JP7287063B2 (ja) 2019-03-29 2023-06-06 住友ゴム工業株式会社 タイヤ用ゴム組成物及びタイヤ
CN114007874A (zh) * 2019-06-20 2022-02-01 株式会社普利司通 胎面基部用橡胶组合物和轮胎
WO2020255450A1 (fr) * 2019-06-20 2020-12-24 株式会社ブリヂストン Composition de caoutchouc pour bande de roulement de base, et pneumatique
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JP7364873B2 (ja) 2019-08-30 2023-10-19 横浜ゴム株式会社 重荷重用空気入りタイヤ
WO2021124811A1 (fr) * 2019-12-18 2021-06-24 株式会社ブリヂストン Composition de caoutchouc, et pneumatique
US20220234388A1 (en) * 2021-01-27 2022-07-28 Sumitomo Rubber Industries, Ltd. Pneumatic tire for heavy load
US11807042B2 (en) * 2021-01-27 2023-11-07 Sumitomo Rubber Industries, Ltd. Pneumatic tire for heavy load
FR3135223A1 (fr) * 2022-05-09 2023-11-10 Compagnie Generale Des Etablissements Michelin Architecture optimisée de pneumatique de génie civil
WO2023217622A1 (fr) * 2022-05-09 2023-11-16 Compagnie Generale Des Etablissements Michelin Architecture optimisée de pneumatique de génie civil

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