WO2018038173A1 - Pneumatique - Google Patents

Pneumatique Download PDF

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Publication number
WO2018038173A1
WO2018038173A1 PCT/JP2017/030176 JP2017030176W WO2018038173A1 WO 2018038173 A1 WO2018038173 A1 WO 2018038173A1 JP 2017030176 W JP2017030176 W JP 2017030176W WO 2018038173 A1 WO2018038173 A1 WO 2018038173A1
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WIPO (PCT)
Prior art keywords
rubber
mass
parts
pneumatic tire
rubber composition
Prior art date
Application number
PCT/JP2017/030176
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English (en)
Japanese (ja)
Inventor
聖一 田原
Original Assignee
株式会社ブリヂストン
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Priority claimed from JP2016166162A external-priority patent/JP2018030548A/ja
Priority claimed from JP2016166163A external-priority patent/JP2018030549A/ja
Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Publication of WO2018038173A1 publication Critical patent/WO2018038173A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • 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
    • 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
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L101/00—Compositions of unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers

Definitions

  • the present invention relates to a pneumatic tire.
  • Patent Document 1 discloses a rubber composition containing ethylene-propylene-diene rubber (EPDM) having an ethylene / propylene ratio of 70/30 to 80/20 as a rubber component.
  • EPDM ethylene-propylene-diene rubber
  • the present inventors examined a tire manufactured by laminating a rubber layer made of a rubber composition containing a non-diene rubber on the tread surface.
  • the rubber composition containing ethylene-propylene-diene rubber (EPDM) as a non-diene rubber has a high storage elastic modulus E ′, and cracks due to strain input during running (strain input crack) are likely to occur.
  • E ′ storage elastic modulus
  • strain input crack strain input crack
  • increasing the amount of ethylene-propylene-diene rubber (EPDM) as a non-diene rubber is preferable from the viewpoint of initial crack resistance (ozone crack resistance), but the problem is that adhesion to an adjacent rubber member is lowered. There is.
  • Patent Document 1 includes a natural rubber of 80% by weight or less and the balance consisting of butadiene rubber (BR), styrene-butadiene rubber (SBR), ethylene propylene rubber (EPDM), and butyl rubber (IIR).
  • BR butadiene rubber
  • SBR styrene-butadiene rubber
  • EPDM ethylene propylene rubber
  • IIR butyl rubber
  • a rubber composition for covering a cord end is disclosed in which 1.5 to 4.5 parts by weight of sulfur is blended with 100 parts by weight of a rubber component having at least one selected rubber.
  • the present inventors have excellent initial crack resistance (ozone crack resistance) on the surface of a tread that requires a reduction in load during driving and an improvement in wet resistance (that is, an improvement in friction coefficient ⁇ ).
  • the application of a rubber layer made of a rubber composition containing a diene rubber was examined. As a result, there has been a problem that the performance as a tread is deteriorated and a problem that the rubber layer is turned over due to low adhesive force.
  • SBR styrene-butadiene rubber
  • EPDM ethylene-propylene-diene rubber
  • ethylene-propylene-diene rubber (EPDM) and styrene-butadiene rubber (SBR) differ greatly in solubility parameter (SP value) and have low compatibility, so a good dispersion state cannot be obtained even when mixed.
  • the ethylene-propylene-diene rubber (EPDM) is deposited on the surface in a large segment state, or the co-curability is deteriorated due to a shift in the vulcanization speed for each segment, resulting in a decrease in adhesiveness. There is a problem of end.
  • the objective of this invention is providing the pneumatic tire which can make crack resistance and adhesive force compatible. Moreover, the objective of this invention is providing the pneumatic tire which can hold
  • crack resistance means resistance to both “initial crack (ozone crack)” and “strain input crack (that is, crack that spreads when strain is input)”.
  • the pneumatic tire of the present invention is a pneumatic tire having a vulcanized rubber layer disposed on the outer surface of the tread portion and extending in the tire circumferential direction, wherein the rubber composition in the vulcanized rubber layer is The vulcanized rubber containing a non-diene rubber and measured at a content A (mass%) of the non-diene rubber in the rubber composition, an initial strain of 2%, a dynamic strain of 1%, a frequency of 50 Hz, and 30 ° C.
  • the storage elastic modulus E ′ (MPa) of the layer satisfies the following formula (1). E ′ ⁇ 3.7 ⁇ A-13.5 (1)
  • “initial strain” does not mean “static strain (measuring dynamic storage elastic modulus with constant strain)”.
  • the pneumatic tire of the present invention is a pneumatic tire having a rubber layer disposed on the outer surface of the tread portion and extending in the tire circumferential direction, wherein the rubber composition in the rubber layer is the rubber composition.
  • the rubber component in the product is 100 parts by mass, ethylene-propylene-diene rubber (EPDM) 30 parts by mass or less, butadiene rubber (BR) 10 parts by mass to 25 parts by mass, and styrene butadiene rubber (SBR) 45 parts by mass. Part to 64 parts by mass.
  • the pneumatic tire which can make crack resistance and adhesive force compatible can be provided.
  • maintain the balance of crack resistance, wet resistance, and adhesive force at a high level can be provided.
  • FIG. 1 is a partial sectional view showing a pneumatic tire according to an embodiment of the present invention.
  • FIG. 1 is a partial sectional view showing a pneumatic tire according to an embodiment of the present invention.
  • a circumferential main groove 2 contributing to ensuring drainage
  • a central rib 3 defined by the circumferential main groove 2
  • a shoulder portion 4 are formed.
  • the lug groove does not exist in the shoulder portion 4.
  • the pneumatic tire of the present embodiment includes a vulcanized rubber layer or a rubber layer 5 disposed on the outer surface of a tread rubber 1 a disposed in the tread portion 1 and extending in the tire circumferential direction.
  • a belt 6 composed of two belt layers and a carcass ply 7 are further provided.
  • the vulcanized rubber layer or rubber layer 5 extends to the shoulder portion 4 and covers not only the central rib 3 but also the shoulder portion 4, but is not limited thereto.
  • the shoulder portion 4 may not be covered without extending to the shoulder portion 4.
  • the vulcanized rubber layer or the rubber layer 5 extends in the tire circumferential direction and is disposed over the entire circumference of the tire, but is not limited thereto, and is not necessarily limited to the entire tire. It does not need to be arranged over the circumference.
  • the rubber composition in the vulcanized rubber layer comprises at least one non-diene rubber, and if necessary, two or more diene rubbers, fillers, softeners, other components, Will be included.
  • the rubber composition in the vulcanized rubber layer preferably includes, for example, a rubber component composed of three components of one kind of non-diene rubber and two kinds of diene rubber.
  • a vulcanized rubber composition obtained by vulcanizing an unvulcanized rubber composition is a vulcanized rubber layer (vulcanized rubber layer).
  • Non-diene rubber content A (% by mass) in the rubber composition and storage modulus E ′ (MPa) of the vulcanized rubber layer measured at an initial strain of 2%, a dynamic strain of 1%, a frequency of 50 Hz, and 30 ° C. ) Satisfies the following formula (1).
  • E ′ ⁇ 3.7 ⁇ A-13.5
  • the above formula (1) is a relational expression extracted from the following technical idea. When the pneumatic tire is deformed during traveling, the vulcanized rubber layer thinner than the tread rubber is preferably deformed without deformation, so that the storage modulus is preferably small.
  • the storage elastic modulus is usually increased. From the above, it is preferable that the storage elastic modulus is small while containing non-diene rubber.
  • the above formula (1) defines such a preferable region.
  • the content A (mass%) of the non-diene rubber is not particularly limited as long as the above formula (1) is satisfied, and can be appropriately selected according to the purpose, but is 1 mass% to 17 mass%. Preferably, 5% by mass to 13% by mass is more preferable.
  • the content A (% by mass) is 1% by mass or more, the crack resistance can be improved, and when it is 17% by mass or less, the adhesive force can be improved.
  • the content A (% by mass) is 5% by mass or more, the crack resistance can be further improved, and when it is 13% by mass or less, the adhesive force can be further improved.
  • Storage elastic modulus E 'of vulcanized rubber layer is measured at an initial strain of 2%, a dynamic strain of 1%, a frequency of 50 Hz, and 30 ° C. using a spectrometer (dynamic viscoelasticity measuring tester) manufactured by Ueshima Seisakusho. .
  • the storage elastic modulus E ′ (MPa) of the vulcanized rubber layer is not particularly limited as long as the above formula (1) is satisfied, and can be appropriately selected according to the purpose. MPa) is preferred.
  • the storage elastic modulus E ′ (MPa) of the vulcanized rubber layer is 4 (MPa) or more, the fracture characteristics can be improved, and when it is 15 (MPa) or less, the initial crack property can be further improved. .
  • the thickness of the vulcanized rubber layer or the rubber layer described later in the tire radial direction is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.01 mm to 2 mm, preferably 0.1 mm to 1. 0 mm is more preferable, and 0.1 mm to 0.5 mm is particularly preferable.
  • the crack resistance can be improved, and when it is 2 mm or less, the wear resistance can be improved.
  • the thickness of the vulcanized rubber layer or the rubber layer described later is 0.1 mm or more, the crack resistance can be further improved, and when it is 1.0 mm or less, the wear resistance is further improved. be able to.
  • the thickness of the vulcanized rubber layer or the rubber layer described below is 0.5 mm or less, the wear resistance can be further improved.
  • the thickness of the vulcanized rubber layer or the rubber layer described below in the tire radial direction in the unvulcanized state can be appropriately selected according to the purpose, but is preferably 0.4 mm to 0.5 mm.
  • Non-diene rubber is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include ethylene-propylene-diene rubber (EPDM), ethylene propylene rubber (EPM), and butyl rubber. These may be used individually by 1 type and may use 2 or more types together. Among these, ethylene-propylene-diene rubber (EPDM) is preferable in terms of ozone resistance and adhesiveness.
  • EPDM ethylene-propylene-diene rubber
  • EPDM ethylene-propylene-diene rubber
  • the ethylene-propylene-diene rubber (EPDM) has a function of improving initial crack resistance (ozone crack resistance) and weather resistance.
  • the initial crack resistance ozone crack resistance
  • the initial crack resistance ozone crack resistance
  • the content of the ethylene-propylene-diene rubber (EPDM) is not particularly limited as long as it is 30 parts by mass or less with respect to 100 parts by mass of the rubber component in the rubber composition, and is appropriately selected according to the purpose. However, 15 to 25 parts by mass is preferable. Adhesive strength can be improved when the content of the ethylene-propylene-diene rubber (EPDM) is 30 parts by mass or less with respect to 100 parts by mass of the rubber component. When the content of the ethylene-propylene-diene rubber (EPDM) is 15 parts by mass or more with respect to 100 parts by mass of the rubber component, the initial crack resistance (ozone crack resistance) can be improved. If it is 25 parts by mass or less, the adhesive force can be further improved.
  • EPDM ethylene-propylene-diene rubber
  • the diene rubber is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include natural rubber, styrene butadiene rubber, butadiene rubber, and isoprene rubber. These may be used individually by 1 type and may use 2 or more types together. Among these, butadiene rubber (BR) and styrene butadiene rubber (SBR) are preferable from the viewpoint of the wearability of the tread rubber and the WET characteristics.
  • BR butadiene rubber
  • SBR styrene butadiene rubber
  • butadiene rubber (BR) has a function of improving the compatibility between the ethylene-propylene-diene rubber (EPDM) and a styrene butadiene rubber (SBR) described later. This is because the solubility parameter (SP value) of the butadiene rubber (BR) is appropriate. Adhesion can be improved by blending the butadiene rubber (BR) with the rubber composition.
  • EPDM ethylene-propylene-diene rubber
  • SBR styrene butadiene rubber
  • the content of the butadiene rubber (BR) is not particularly limited as long as it is 10 to 25 parts by mass with respect to 100 parts by mass of the rubber component, and can be appropriately selected according to the purpose. It is preferably 15 to 25 parts by mass.
  • the adhesive force can be improved, and when the content is 25 parts by mass or less, wet resistance Can be improved.
  • Adhesive force can be improved more as content of the said butadiene rubber (BR) is 15 mass parts or more with respect to 100 mass parts of said rubber components.
  • SBR Styrene Butadiene Rubber
  • the content of the styrene butadiene rubber (SBR) is not particularly limited as long as it is 45 to 64 parts by mass with respect to 100 parts by mass of the rubber component, and can be appropriately selected according to the purpose. 50 parts by mass to 60 parts by mass is preferable.
  • SBR styrene butadiene rubber
  • wet resistance can be improved, and further, 64 parts by mass or less.
  • the initial crack resistance ozone crack resistance
  • styrene butadiene rubber When the content of the styrene butadiene rubber (SBR) is 50 parts by mass or more with respect to 100 parts by mass of the rubber component, wet resistance can be further improved, and further, it is 60 parts by mass or less.
  • the initial crack resistance ozone crack resistance
  • the filler has a function of improving fracture resistance.
  • the filler may be at least one of carbon black and silica, but a mixture of carbon black and silica is preferable.
  • the content of the filler is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 30 to 80 parts by weight, more preferably 40 parts by weight with respect to 100 parts by weight of the rubber component. ⁇ 70 parts by weight are preferred.
  • the filler content is 40 parts by mass or more with respect to 100 parts by mass of the rubber component, the fracture resistance can be improved, and when it is 70 parts by mass or less, the crack resistance is improved. Can be made.
  • the softening agent has a function of softening and improving crack resistance.
  • the softening agent may be at least one of oil and resin, but a mixture of oil and resin is preferable.
  • the content of the softening agent is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 20 to 85 parts by mass with respect to 100 parts by mass of the rubber component. When the content of the softening agent is 20 parts by mass or more with respect to 100 parts by mass of the rubber component, the crack resistance can be improved, and when the content is 85 parts by mass or less, the fracture resistance is improved. Can be improved.
  • the oil in the said softener does not contain the oil component of oil extended SBR mentioned later in an Example.
  • the oil is not particularly limited and may be appropriately selected depending on the intended purpose. For example, process oil, spindle oil, aroma oil, octyl oleate, trioctyl phosphonate, soybean oil, sunflower oil, orange oil , Etc.
  • the resin is not particularly limited and may be appropriately selected depending on the intended purpose.
  • Anti-aging agent By blending the anti-aging agent, aging resistance and ozone crack resistance can be improved.
  • Specific examples of the antiaging agent are not particularly limited and may be appropriately selected depending on the purpose.
  • the amount of the anti-aging agent is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.5 to 4 parts by mass with respect to 100 parts by mass of the rubber component.
  • ⁇ Wax By blending the wax, crack resistance can be improved.
  • Specific examples of the wax are not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include paraffin wax, microcrystalline wax, and natural (carnauba wax). These may be used individually by 1 type and may use 2 or more types together.
  • the blending amount of the wax is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.5 to 2 parts by mass with respect to 100 parts by mass of the rubber component.
  • the rubber can be reinforced by reacting silica and polymer.
  • Specific examples of the silane coupling agent are not particularly limited and may be appropriately selected depending on the intended purpose.
  • the compounding amount of the silane coupling agent is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 3% by mass to 18% by mass with respect to silica.
  • Vulcanization accelerator By blending the vulcanization accelerator, vulcanization of the rubber can be accelerated. There is no restriction
  • the blending amount of the vulcanization accelerator is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 1 part by mass to 4 parts by mass with respect to 100 parts by mass of the rubber component.
  • the method for attaching the vulcanized rubber layer is not particularly limited and may be appropriately selected according to the purpose. For example, a method of wrapping a layer of an unvulcanized rubber composition around the tread surface and vulcanizing the layer. , Etc.
  • the production method is not particularly limited, and an unvulcanized rubber layer (EPDM) is attached to an unvulcanized tire and then vulcanized, or an unvulcanized rubber layer (EPDM) and other unvulcanized rubber layers
  • Various production methods are conceivable, such as vulcanizing after producing an unvulcanized tire using the laminated body as a tread, or vulcanizing after attaching a vulcanized rubber layer to the unvulcanized tire.
  • the rubber composition in the rubber layer includes at least a rubber component including three components of ethylene-propylene-diene rubber (EPDM), butadiene rubber (BR), and styrene butadiene rubber (SBR). A filler, a softener, and other components are included as necessary. Further, the rubber composition in the rubber layer may contain at least one non-diene rubber and two or more diene rubbers. A vulcanized rubber composition obtained by vulcanizing an unvulcanized rubber composition is a vulcanized rubber layer.
  • EPDM ethylene-propylene-diene rubber
  • BR butadiene rubber
  • SBR styrene butadiene rubber
  • a filler, a softener, and other components are included as necessary.
  • the rubber composition in the rubber layer may contain at least one non-diene rubber and two or more diene rubbers.
  • a vulcanized rubber composition obtained by vulcanizing an unvulcanized rubber composition is a vulcanized rubber layer.
  • Ethylene-propylene-diene rubber (EPDM)
  • the ethylene-propylene-diene rubber (EPDM) has a function of improving initial crack resistance (ozone crack resistance) and weather resistance.
  • the initial crack resistance ozone crack resistance
  • the initial crack resistance ozone crack resistance
  • the content of the ethylene-propylene-diene rubber (EPDM) is not particularly limited as long as it is 30 parts by mass or less with respect to 100 parts by mass of the rubber component in the rubber composition, and is appropriately selected according to the purpose. However, 15 to 25 parts by mass is preferable. Adhesive strength can be improved when the content of the ethylene-propylene-diene rubber (EPDM) is 30 parts by mass or less with respect to 100 parts by mass of the rubber component. When the content of the ethylene-propylene-diene rubber (EPDM) is 15 parts by mass or more with respect to 100 parts by mass of the rubber component, the initial crack resistance (ozone crack resistance) can be improved. If it is 25 parts by mass or less, the adhesive force can be further improved.
  • EPDM ethylene-propylene-diene rubber
  • butadiene rubber (BR) has a function of improving the compatibility between the ethylene-propylene-diene rubber (EPDM) and a styrene butadiene rubber (SBR) described later. As a reason, it is conjectured that the solubility parameter (SP value) of the butadiene rubber (BR) is appropriate. Adhesion can be improved by blending the butadiene rubber (BR) with the rubber composition.
  • EPDM ethylene-propylene-diene rubber
  • SBR styrene butadiene rubber
  • the content of the butadiene rubber (BR) is not particularly limited as long as it is 10 to 25 parts by mass with respect to 100 parts by mass of the rubber component, and can be appropriately selected according to the purpose. It is preferably 15 to 25 parts by mass.
  • the adhesive force can be improved, and when the content is 25 parts by mass or less, wet resistance Can be improved.
  • Adhesive force can be improved more as content of the said butadiene rubber (BR) is 15 mass parts or more with respect to 100 mass parts of said rubber components.
  • SBR Styrene Butadiene Rubber
  • the content of the styrene butadiene rubber (SBR) is not particularly limited as long as it is 45 to 64 parts by mass with respect to 100 parts by mass of the rubber component, and can be appropriately selected according to the purpose. 50 parts by mass to 60 parts by mass is preferable.
  • SBR styrene butadiene rubber
  • wet resistance can be improved, and further, 64 parts by mass or less.
  • the initial crack resistance ozone crack resistance
  • styrene butadiene rubber When the content of the styrene butadiene rubber (SBR) is 50 parts by mass or more with respect to 100 parts by mass of the rubber component, wet resistance can be further improved, and further, it is 60 parts by mass or less.
  • the initial crack resistance ozone crack resistance
  • the filler has a function of improving fracture resistance.
  • the filler may be at least one of carbon black and silica, but a mixture of carbon black and silica is preferable.
  • the content of the filler is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 40 parts by mass to 70 parts by mass with respect to 100 parts by mass of the rubber component. When the filler content is 40 parts by mass or more with respect to 100 parts by mass of the rubber component, the fracture resistance can be improved, and when it is 70 parts by mass or less, the crack resistance is improved. Can be made.
  • the softening agent has a function of softening and improving crack resistance.
  • the softening agent may be at least one of oil and resin, but a mixture of oil and resin is preferable.
  • the content of the softening agent is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 40 parts by mass to 70 parts by mass with respect to 100 parts by mass of the rubber component. When the content of the softening agent is 40 parts by mass or more with respect to 100 parts by mass of the rubber component, crack resistance can be improved, and when the content is 70 parts by mass or less, fracture resistance is improved. Can be improved.
  • the oil is not particularly limited and may be appropriately selected depending on the intended purpose. For example, process oil, spindle oil, aroma oil, octyl oleate, trioctyl phosphonate, soybean oil, sunflower oil, orange oil , Etc.
  • the resin is not particularly limited and may be appropriately selected depending on the intended purpose.
  • Anti-aging agent By blending the anti-aging agent, aging resistance and ozone crack resistance can be improved.
  • Specific examples of the antiaging agent are not particularly limited and may be appropriately selected depending on the purpose.
  • the amount of the anti-aging agent is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.5 to 4 parts by mass with respect to 100 parts by mass of the rubber component.
  • ⁇ Wax By blending the wax, crack resistance can be improved.
  • Specific examples of the wax are not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include paraffin wax, microcrystalline wax, and natural (carnauba wax). These may be used individually by 1 type and may use 2 or more types together.
  • the blending amount of the wax is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.5 to 2 parts by mass with respect to 100 parts by mass of the rubber component.
  • the rubber can be reinforced by reacting silica and polymer.
  • the silane coupling agent are not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include bis (3-triethoxysilylpropyl) tetrasulfide and bis (3-triethoxysilylpropyl). Polysulfide, ⁇ -mercaptopropyltriethoxysilane, ⁇ -aminopropyltriethoxysilane, N-phenyl- ⁇ -aminopropyltrimethoxysilane, N- ⁇ (aminoethyl) - ⁇ -aminopropyltrimethoxysilane, etc.
  • the compounding amount of the silane coupling agent is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 6% by mass to 18% by mass with respect to silica.
  • Vulcanization accelerator By blending the vulcanization accelerator, vulcanization of the rubber can be accelerated. There is no restriction
  • the blending amount of the vulcanization accelerator is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 1 part by mass to 4 parts by mass with respect to 100 parts by mass of the rubber component.
  • Rubber layer application method >> There is no restriction
  • the pneumatic tire of the present invention is a pneumatic tire having a vulcanized rubber layer disposed on the outer surface of the tread portion and extending in the tire circumferential direction, and the rubber composition in the vulcanized rubber layer.
  • the storage elastic modulus E ′ (MPa) of the rubber layer satisfies the following formula (1).
  • E ′ ⁇ 3.7 ⁇ A-13.5 (1) According to the pneumatic tire of the present invention, both crack resistance and adhesive strength can be achieved.
  • the content A of the non-diene rubber in the rubber composition is preferably 1% by mass to 17% by mass. According to this structure, crack resistance and adhesive force can be improved.
  • the non-diene rubber is preferably ethylene-propylene-diene rubber (EPDM). According to this configuration, the initial crack resistance (ozone crack resistance) can be further improved.
  • EPDM ethylene-propylene-diene rubber
  • the pneumatic tire of the present invention is a pneumatic tire having a rubber layer disposed on the outer surface of the tread portion and extending in the tire circumferential direction, wherein the rubber composition in the rubber layer is the rubber composition.
  • the rubber component in the product is 100 parts by mass, ethylene-propylene-diene rubber (EPDM) 30 parts by mass or less, butadiene rubber (BR) 10 parts by mass to 25 parts by mass, and styrene butadiene rubber (SBR) 45 parts by mass. Part to 64 parts by mass.
  • EPDM ethylene-propylene-diene rubber
  • BR butadiene rubber
  • SBR styrene butadiene rubber
  • the content of ethylene-propylene-diene rubber (EPDM) in the rubber composition is 15 to 25 parts by mass when the rubber component is 100 parts by mass. It is preferable. According to this structure, crack resistance and adhesive force can be improved.
  • EPDM ethylene-propylene-diene rubber
  • the content of butadiene rubber (BR) in the rubber composition is 15 to 25 parts by mass when the rubber component is 100 parts by mass. preferable. According to this configuration, the adhesive force can be improved.
  • the rubber composition further contains carbon black and / or silica, and the total content of the carbon black and the silica with respect to 100 parts by mass of the rubber component in the rubber composition. Is preferably 40 to 70 parts by mass. According to this structure, the performance (for example, abrasion resistance / wet resistance or fracture resistance) of the tread rubber can be improved.
  • the rubber composition further contains oil and / or resin, and the total content of the oil and the resin with respect to 100 parts by mass of the rubber component in the rubber composition, It is preferably 20 to 85 parts by mass. According to this configuration, the adhesive force can be further improved.
  • Each rubber composition was prepared based on the contents shown in Table 1-1, Table 1-2, Table 3-1, and Table 3-2.
  • the numbers in the formulations of Table 1-1, Table 1-2, Table 3-1, and Table 3-2 indicate parts by mass.
  • the following measurements and evaluations were performed for the rubber compositions described in Table 1-1, Table 1-2, Table 3-1, and Table 3-2. The results are shown in Table 1-1, Table 1-2, Table 3-1, and Table 3-2.
  • the storage elastic modulus E ′ was measured using a spectrometer (dynamic viscoelasticity measuring tester) manufactured by Ueshima Seisakusho at an initial strain of 2%, a dynamic strain of 1%, a frequency of 50 Hz, and 30 ° C.
  • the composition of the tread rubber is shown in Table 2 below.
  • the numbers in the composition of Table 2 below indicate “parts by mass” representing the mass of each compounding chemical when the mass of the rubber component is 100.
  • SBR polymer
  • ⁇ Adhesive strength evaluation> ⁇ Method for Producing Test Tire ⁇ Method for Producing Test Tire
  • a test tire precursor was prepared by a conventional method.
  • a rubber layer made of each rubber composition is attached to the surface of the tread of the test tire precursor in an unvulcanized state and vulcanized at 160 ° C. for 15 minutes to form a vulcanized rubber layer.
  • a test tire was produced.
  • Table 1-1, Table 1-2, Table 3-1, and Table 3-2 show the thickness in the tire radial direction of the vulcanized rubber layer of each Example and Comparative Example.

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  • 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)
  • Tires In General (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L'invention concerne un pneumatique pouvant offrir à la fois une résistance à la fissuration et une force adhésive. Un pneumatique a une couche de caoutchouc vulcanisé disposée sur la surface extérieure d'une section bande de roulement, et s'étendant dans la direction circonférentielle du pneumatique, le pneumatique étant caractérisé en ce que la composition de caoutchouc de la couche de caoutchouc vulcanisé contient un caoutchouc non à base de diène, et une quantité de contenu A (% en masse) du caoutchouc non à base de diène dans la composition de caoutchouc, et un module d'élasticité de stockage E' (MPa) de la couche de caoutchouc vulcanisé mesurée à une contrainte initiale de 2 %, une contrainte dynamique de 1 %, une fréquence de 50 Hz et une température de 30 °C satisfont l'équation suivante (1). E' ≦ 3,7 × A - 13,5・・・(1)
PCT/JP2017/030176 2016-08-26 2017-08-23 Pneumatique WO2018038173A1 (fr)

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JP2016166162A JP2018030548A (ja) 2016-08-26 2016-08-26 空気入りタイヤ
JP2016166163A JP2018030549A (ja) 2016-08-26 2016-08-26 空気入りタイヤ
JP2016-166162 2016-08-26
JP2016-166163 2016-08-26

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108839410A (zh) * 2018-06-25 2018-11-20 安徽快来防水防腐有限公司 一种建筑防腐防水材料及其制作工艺
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

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6348344A (ja) * 1986-08-19 1988-03-01 Bridgestone Corp 高速耐久性空気入りタイヤ
JPH01269601A (ja) * 1988-04-20 1989-10-27 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2005139352A (ja) * 2003-11-07 2005-06-02 Yokohama Rubber Co Ltd:The 応急用空気入りタイヤのトレッド部用ゴム組成物及び当該ゴム組成物がトレッド部において使用されている応急用空気入りタイヤ
JP2008201841A (ja) * 2007-02-16 2008-09-04 Yokohama Rubber Co Ltd:The 応急用空気入りタイヤ
JP2012111451A (ja) * 2010-11-26 2012-06-14 Bridgestone Corp プレキュアトレッド及びそれを用いた空気入りタイヤ
JP2013526622A (ja) * 2010-05-10 2013-06-24 コンパニー ゼネラール デ エタブリッスマン ミシュラン トレッドが熱可塑性加硫物（ｔｐｖ）エラストマーを含むタイヤ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6348344A (ja) * 1986-08-19 1988-03-01 Bridgestone Corp 高速耐久性空気入りタイヤ
JPH01269601A (ja) * 1988-04-20 1989-10-27 Yokohama Rubber Co Ltd:The 空気入りタイヤ
JP2005139352A (ja) * 2003-11-07 2005-06-02 Yokohama Rubber Co Ltd:The 応急用空気入りタイヤのトレッド部用ゴム組成物及び当該ゴム組成物がトレッド部において使用されている応急用空気入りタイヤ
JP2008201841A (ja) * 2007-02-16 2008-09-04 Yokohama Rubber Co Ltd:The 応急用空気入りタイヤ
JP2013526622A (ja) * 2010-05-10 2013-06-24 コンパニー ゼネラール デ エタブリッスマン ミシュラン トレッドが熱可塑性加硫物（ｔｐｖ）エラストマーを含むタイヤ
JP2012111451A (ja) * 2010-11-26 2012-06-14 Bridgestone Corp プレキュアトレッド及びそれを用いた空気入りタイヤ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108839410A (zh) * 2018-06-25 2018-11-20 安徽快来防水防腐有限公司 一种建筑防腐防水材料及其制作工艺
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

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