WO2013008798A1 - サイドウォール用ゴム組成物及び空気入りタイヤ - Google Patents
サイドウォール用ゴム組成物及び空気入りタイヤ Download PDFInfo
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- WO2013008798A1 WO2013008798A1 PCT/JP2012/067524 JP2012067524W WO2013008798A1 WO 2013008798 A1 WO2013008798 A1 WO 2013008798A1 JP 2012067524 W JP2012067524 W JP 2012067524W WO 2013008798 A1 WO2013008798 A1 WO 2013008798A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0025—Compositions of the sidewalls
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L15/00—Compositions of rubber derivatives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
-
- 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
-
- 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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T152/00—Resilient tires and wheels
- Y10T152/10—Tires, resilient
- Y10T152/10495—Pneumatic tire or inner tube
Definitions
- the present invention relates to a rubber composition for a sidewall, and a pneumatic tire using the same.
- filler such as silica and carbon black
- tan ⁇ can be reduced and fuel economy can be further improved.
- the complex elastic modulus E * is also reduced, so that steering stability, The breaking resistance and the breaking elongation tend to be reduced.
- E * As a method of enhancing E *, it is known to use microfibers such as polyethylene terephthalate, powdered paper fibers, aramid fibers, etc., but the microfibers are not bonded to the rubber matrix, so they are notched or broken. It may be a starting point, and there is a problem in crack growth resistance. E * can also be increased by using a high viscosity, high cis butadiene rubber, but in this case, the filler is less likely to be dispersed, and the fuel economy tends to be deteriorated. When the amount of the filler is reduced, the kneading torque is reduced, and thus it tends to be more difficult to disperse the filler well.
- Patent Document 1 proposes a method of improving low fuel consumption, crack growth resistance, etc. by using butadiene rubber containing 1, 2-syndiotactic polybutadiene crystals, natural rubber, etc. There is still no technology which simultaneously satisfies the steering stability, the breaking resistance, the breaking elongation and the processability.
- the present invention solves the above-mentioned problems and improves the fuel economy, steering stability, breaking resistance, breaking elongation, and processability in a well-balanced manner, and can further suppress generation of spew breakage during tire demolding. It aims at providing a composition and a pneumatic tire using the same.
- the present invention provides a terminal-modified butadiene in a total content of 5 to 60% by mass of a butadiene rubber containing 1,2-syndiotactic polybutadiene crystals and a butadiene rubber synthesized using a rare earth catalyst in 100% by mass of a rubber component.
- the present invention relates to a rubber composition for a sidewall, wherein the total content of silica having a nitrogen adsorption specific surface area of 70 to 250 m 2 / g is 20 to 40 parts by mass and the content of zinc oxide is 3.6 to 16 parts by mass.
- the nitrogen adsorption specific surface area of the carbon black is preferably 25 to 45 m 2 / g, and the content of the carbon black is preferably 15 to 38 parts by mass with respect to 100 parts by mass of the rubber component.
- the content of the rubber is 25 to 50% by mass, and the content of the isoprene rubber is 30 to 60% by mass.
- the terminal-modified butadiene rubber is preferably a tin-modified butadiene rubber.
- the above rubber composition is preferably obtained by vulcanization at a vulcanization temperature of 160 to 190 ° C. from the viewpoint of achieving both production efficiency and tire performance.
- the present invention also relates to a pneumatic tire having a sidewall manufactured using the above rubber composition.
- butadiene rubber synthesized using a butadiene rubber containing 1,2-syndiotactic polybutadiene crystals and / or a rare earth catalyst, an end-modified butadiene rubber and an isoprene rubber in a specific ratio Since it is a rubber composition for a sidewall, in which a predetermined amount of carbon black and / or silica having a specific nitrogen adsorption specific surface area and zinc oxide are respectively blended with a rubber component to be contained, fuel economy and steering stability It is possible to provide a pneumatic tire having a well-balanced improvement in breaking resistance and breaking elongation. In addition, it has excellent processability, can suppress the occurrence of spew breakage at the time of demolding of the tire, and can reduce the number of times of mold maintenance, which is also excellent in productivity.
- the rubber composition of the present invention with respect to 100 parts by mass of the rubber component, the total content of silica to carbon black and a specific surface area by nitrogen adsorption 70 ⁇ 250m 2 / g of specific surface area by nitrogen adsorption 25 ⁇ 120 m 2 / g is 20 to Butadiene rubber (SPB-containing BR) containing 1,2-syndiotactic polybutadiene crystals in 40 parts by mass, containing 3.6 to 16 parts by mass of zinc oxide and containing 100% by mass of the above rubber component, and a rare earth catalyst
- the rubber composition of the present invention can improve the low fuel consumption by blending the terminal-modified BR together with reducing the total content of carbon black and silica, and at the same time, containing SPB.
- E * can be improved, good steering stability, breaking resistance, breaking elongation can be ensured, and furthermore, good processability can be obtained.
- the long-lasting spew formed by vent holes or vent pieces for venting air provided in the tire mold due to a decrease in breaking resistance and breaking elongation is at the time of tire demolding (tire When it comes out of the mold). If the spew is cut during demolding, the spew hole will be closed, so there will be no room for the trap air to flow between the green cover and the mold when the next tire is vulcanized, and heat from the mold to the green cover The conduction does not proceed efficiently, and an appearance defect called a burn-in phenomenon occurs. When the burn-in phenomenon occurs, processes such as buff correction, repainting, and burn-in repair are required, which impairs productivity.
- the rubber composition of the present invention contains SPB-containing BR and / or rare earth BR.
- SPB-containing BR general-purpose products in tire manufacturing can be used, but 1,2-syndiotactic polybutadiene crystals chemically bond with BR and are dispersed from the viewpoint that the above-mentioned performance can be obtained well.
- the alignment of 1,2-syndiotactic polybutadiene crystals in the rubber composition in the spew hole improves the hardness and strength of the rubber composition and effectively suppresses the occurrence of spew breakage during tire demolding. it can.
- the melting point of 1,2-syndiotactic polybutadiene crystals is preferably 180 ° C. or more, more preferably 190 ° C. or more, and preferably 220 ° C. or less, more preferably 210 ° C. or less. If it is less than the lower limit, there is a possibility that the improvement effect of the steering stability, the breaking resistance and the breaking elongation by the SPB-containing BR may not be sufficiently obtained, and if it exceeds the upper limit, the processability tends to be deteriorated.
- the content of 1,2-syndiotactic polybutadiene crystals is preferably 2.5% by mass or more, more preferably 10% by mass or more. If it is less than 2.5% by mass, the reinforcing effect (E *) may not be sufficient.
- the content is preferably 20% by mass or less, more preferably 18% by mass or less. If it exceeds 20% by mass, the processability tends to deteriorate.
- the rare earth BR is a butadiene rubber synthesized using a rare earth catalyst and is characterized by having a high cis content and a low vinyl content.
- As the rare earth-based BR general-purpose products in tire manufacture can be used.
- the rare earth element catalyst used for the synthesis of the rare earth BR known catalysts can be used.
- a catalyst containing a lanthanum series rare earth compound, an organic aluminum compound, an aluminoxane, a halogen containing compound, and optionally a Lewis base can be mentioned.
- an Nd-based catalyst using a neodymium (Nd) -containing compound as the lanthanum series rare earth element compound is particularly preferable.
- Examples of the lanthanum series rare earth element compounds include halides, carboxylates, alcoholates, thioalcoholates and amides of rare earth metals of atomic numbers 57 to 71.
- the use of an Nd-based catalyst is preferable in that BR having a high cis content and a low vinyl content can be obtained.
- the organic aluminum compound is represented by AlR a R b R c (wherein, R a , R b and R c are the same or different and each represents hydrogen or a hydrocarbon group having 1 to 8 carbon atoms). You can use one.
- Examples of the aluminoxane include chain aluminoxanes and cyclic aluminoxanes.
- halogen-containing compound AlX k R d 3-k (wherein, X is a halogen, R d is an alkyl group having 1 to 20 carbon atoms, an aryl group or an aralkyl group, k is 1, 1.5, 2 or 3)
- Strontium halides such as Me 3 SrCl, Me 2 SrCl 2 , MeSrHCl 2 , MeSrCl 3 and the like; and metal halides such as silicon tetrachloride, tin tetrachloride, titanium tetrachloride and the like.
- the Lewis base is used to complex a lanthanum series rare earth element compound, and acetylacetone, ketone, alcohol and the like are suitably used.
- the rare earth element-based catalyst may be used in the form of silica, magnesia, magnesium chloride or the like even when used in the state of being dissolved in an organic solvent (n-hexane, cyclohexane, n-heptane, toluene, xylene, benzene, etc.) during butadiene polymerization. It may be supported on a suitable carrier and used.
- the polymerization conditions may be either solution polymerization or bulk polymerization, the preferred polymerization temperature is ⁇ 30 to 150 ° C., and the polymerization pressure may be optionally selected depending on other conditions.
- the ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) of the rare earth based BR is preferably 1.2 or more, more preferably 1.5 or more. If it is less than 1.2, the processability tends to deteriorate.
- the Mw / Mn is preferably 5 or less, more preferably 4 or less. If it exceeds 5, there is a tendency that the improvement effect of steering stability, breaking resistance and breaking elongation tends to be reduced.
- the Mw of the rare earth-based BR is preferably 300,000 or more, more preferably 500,000 or more, and preferably 1.5 million or less, more preferably 1.2 million or less. Furthermore, Mn of the rare earth-based BR is preferably at least 100,000, more preferably at least 150,000, and preferably at most 1,000,000, more preferably at most 800,000. If the Mw or Mn is less than the lower limit, the steering stability, the breaking resistance, the breaking elongation, and the fuel economy tend to be lowered. If the upper limit is exceeded, the processability may be deteriorated.
- weight average molecular weight (Mw) and number average molecular weight (Mn) are gel permeation chromatograph (GPC) (GPC-8000 series manufactured by Tosoh Corp., detector: differential refractometer, column: It can obtain
- GPC gel permeation chromatograph
- the cis content of the rare earth BR is preferably 90% by mass or more, more preferably 93% by mass or more, and still more preferably 95% by mass or more. If the amount is less than 90% by mass, steering stability, breaking resistance, breaking elongation, and fuel economy may be reduced.
- the cis content can be measured by infrared absorption spectroscopy.
- the vinyl content of the rare earth BR is preferably 1.8% by mass or less, more preferably 1.0% by mass or less, still more preferably 0.5% by mass or less, and particularly preferably 0.3% by mass or less. If it exceeds 1.8% by mass, steering stability, breaking resistance and breaking elongation may be reduced.
- the vinyl content can be measured by infrared absorption spectroscopy.
- the content of SPB-containing BR in 100% by mass of the rubber component is preferably 5% by mass or more, more preferably 10% by mass or more, still more preferably 20% by mass. % Or more. If it is less than 5% by mass, steering stability, breaking resistance and breaking elongation may not be obtained sufficiently.
- the content is preferably 60% by mass or less, more preferably 40% by mass or less, and still more preferably 30% by mass or less. If it exceeds 60% by mass, sufficient fuel economy may not be obtained.
- the content of the rare earth BR in 100% by mass of the rubber component is preferably 5% by mass or more, more preferably 10% by mass or more, still more preferably 20% by mass. % Or more. If it is less than 5% by mass, steering stability, breaking resistance and breaking elongation may not be obtained sufficiently.
- the content is preferably 60% by mass or less, more preferably 50% by mass or less. If it exceeds 60% by mass, sufficient fuel economy may not be obtained.
- the total content of the SPB-containing BR and the rare earth based BR in 100% by mass of the rubber component is 5% by mass or more, preferably 10% by mass or more, and more preferably 20% by mass or more. If it is less than 5% by mass, steering stability, breaking resistance and breaking elongation may not be obtained sufficiently.
- the total content is 60% by mass or less, preferably 40% by mass or less, more preferably 30% by mass or less. If it exceeds 60% by mass, sufficient fuel economy may not be obtained.
- the rubber composition of the present invention contains terminal-modified BR.
- the terminal-modified BR is not particularly limited, and can be selected according to the type of filler (carbon black, silica, etc.) that can be used, but tin-modified butadiene rubber (tin-modified BR) because excellent low fuel consumption can be obtained.
- tin-modified BR tin-modified butadiene rubber
- S-modified BR modified butadiene rubber
- tin-modified BR modified with a compound represented by the following formula (1) is preferable, and tin-modified BR is more preferable.
- R 1 , R 2 and R 3 are the same or different and each represents an alkyl group, an alkoxy group, a silyloxy group, an acetal group, a carboxyl group (—COOH), a mercapto group (—SH) or these R 4 and R 5 are the same or different and each represents a hydrogen atom or an alkyl group, and n is an integer.
- the tin-modified BR is not particularly limited, but is preferably a tin-modified BR which is polymerized by a lithium initiator and has a tin atom content of 50 to 3000 ppm, a vinyl content of 5 to 50% by mass and a molecular weight distribution of 2 or less.
- the tin-modified BR is obtained by polymerizing 1,3-butadiene with a lithium initiator and then adding a tin compound, and the terminal of the tin-modified BR molecule is further bonded by a tin-carbon bond Is preferred.
- lithium initiators include lithium-based compounds such as alkyllithiums and aryllithiums.
- tin compounds include tin tetrachloride and butyltin trichloride.
- the content of tin atoms in the tin-modified BR is preferably 50 ppm or more. Below 50 ppm, tan ⁇ tends to increase. Further, the content of tin atoms is preferably 3000 ppm or less, more preferably 300 ppm or less. If it exceeds 3000 ppm, the processability of the kneaded material tends to deteriorate.
- the molecular weight distribution (Mw / Mn) of the tin-modified BR is preferably 2 or less. When Mw / Mn exceeds 2, tan ⁇ tends to increase.
- the lower limit of the molecular weight distribution is not particularly limited, but is preferably 1 or more.
- the vinyl content of the tin-modified BR is preferably 5% by mass or more. If it is less than 5% by mass, it is difficult to produce tin-modified BR.
- the vinyl content is preferably 50% by mass or less, more preferably 20% by mass or less. If it exceeds 50% by mass, the dispersibility of the carbon black is poor, and the fuel economy, breaking resistance and breaking elongation tend to be lowered.
- S-modified BR examples include those described in JP-A-2010-111753 and the like.
- an alkoxy group is preferable as R 1 , R 2 and R 3 from the viewpoint that excellent fuel economy and breaking resistance can be obtained (preferably having 1 to 8 carbon atoms, more preferably carbon). 1 to 4 alkoxy groups).
- R 4 and R 5 an alkyl group is preferable (preferably an alkyl group having 1 to 3 carbon atoms).
- n is preferably 1 to 5, more preferably 2 to 4, and further preferably 3.
- Specific examples of the compound represented by the formula (1) include 2-dimethylaminoethyltrimethoxysilane, 3-dimethylaminopropyltrimethoxysilane, 2-dimethylaminoethyltriethoxysilane, 3-dimethylaminopropyltriethoxysilane 2-diethylaminoethyltrimethoxysilane, 3-diethylaminopropyltrimethoxysilane, 2-diethylaminoethyltriethoxysilane, 3-diethylaminopropyltriethoxysilane and the like.
- 3-dimethylaminopropyltrimethoxysilane, 3-dimethylaminopropyltriethoxysilane, and 3-diethylaminopropyltrimethoxysilane are preferable in that the above-mentioned performance can be improved well. These may be used alone or in combination of two or more.
- butadiene rubber with the compound represented by the formula (1) As a method for modifying butadiene rubber with the compound represented by the formula (1), conventionally known methods such as the methods described in Japanese Patent Publication No. 6-53768 and Japanese Patent Publication No. 6-57767 can be used. For example, it can be modified by contacting butadiene rubber with the compound, and specifically, after preparation of butadiene rubber by anionic polymerization, a predetermined amount of the compound is added to the rubber solution to polymerize the terminal of butadiene rubber (activity And the like, and the like.
- the vinyl content of the S-modified BR is preferably 35% by mass or less, more preferably 30% by mass or less. If the vinyl content exceeds 35% by mass, fuel economy may be reduced.
- the lower limit of the vinyl content is not particularly limited, but is preferably 1% by mass or more, and more preferably 20% by mass or more. If the amount is less than 1% by mass, the heat resistance and the deterioration resistance may be reduced.
- the weight average molecular weight (Mw) of the S-modified BR is preferably at least 100,000, more preferably at least 400,000. If it is less than 100,000, sufficient breaking strength and bending fatigue resistance may not be obtained. Mw is preferably 2,000,000 or less, more preferably 800,000 or less. If it exceeds 2,000,000, the processability may be reduced to cause dispersion failure, and a sufficient breaking strength may not be obtained.
- the content of terminal-modified BR in 100% by mass of the rubber component is 7% by mass or more, preferably 25% by mass or more. If the amount is less than 7% by mass, sufficient fuel economy may not be obtained.
- the content is 60% by mass or less, preferably 50% by mass or less. If it exceeds 60% by mass, the processability tends to decrease.
- isoprene rubber examples include natural rubber (NR), isoprene rubber (IR), liquid isoprene rubber (L-IR), epoxidized natural rubber (ENR) and the like.
- NR natural rubber
- IR isoprene rubber
- L-IR liquid isoprene rubber
- EMR epoxidized natural rubber
- preferred is NR from the viewpoint of obtaining good elongation at break and excellent roll processability.
- NR and IR is more preferable in terms of obtaining better processability.
- the NR and IR are not particularly limited, and those generally used in the tire industry can be used.
- the content of isoprene-based rubber in 100% by mass of the rubber component is 20% by mass or more, preferably 30% by mass or more. If the amount is less than 20% by mass, the breaking elongation may not be sufficiently obtained.
- the content is 70% by mass or less, preferably 60% by mass or less. If the amount is more than 70% by mass, fuel economy may be reduced.
- the rubber composition of the present invention may use other rubber components in addition to the SPB-containing BR, the rare earth BR, the terminal modified BR and the isoprene rubber.
- a rubber component which can be used for example, diene rubber such as styrene butadiene rubber (SBR), ethylene-propylene-diene rubber (EPDM), butyl rubber (IIR), halogenated butyl rubber (X-IIR) and chloroprene rubber (CR) It can be mentioned.
- the rubber composition of the present invention contains carbon black having a nitrogen adsorption specific surface area of 25 to 120 m 2 / g and / or silica having a nitrogen adsorption specific surface area of 70 to 250 m 2 / g.
- the nitrogen adsorption specific surface area of carbon black is 25 m 2 / g or more, preferably 35 m 2 / g or more, and 120 m 2 / g or less, preferably 45 m 2 / g or less. If it is less than the lower limit, sufficient steering stability, breaking resistance, and elongation at break may not be obtained, and if it exceeds the upper limit, fuel economy tends to deteriorate.
- the carbon black N 2 SA is determined according to JIS K 6217-2: 2001.
- the nitrogen adsorption specific surface area (N 2 SA) of silica is 70 m 2 / g or more, preferably 75 m 2 / g or more, and 250 m 2 / g or less, preferably 200 m 2 / g or less. If it is less than the lower limit, sufficient steering stability, breaking resistance, and elongation at break may not be obtained, and if it exceeds the upper limit, fuel economy tends to deteriorate.
- the N 2 SA of silica is a value measured by the BET method according to ASTM D3037-81.
- the content of carbon black is preferably 10 parts by mass or more, more preferably 15 parts by mass or more, still more preferably 25 parts by mass with respect to 100 parts by mass of the rubber component. It is preferably at least 30 parts by mass, particularly preferably at least 30 parts by mass. If the amount is less than 10 parts by mass, sufficient steering stability, breaking resistance and breaking elongation may not be obtained.
- the content of carbon black is preferably 40 parts by mass or less, more preferably 38 parts by mass or less. If the amount is more than 40 parts by mass, sufficient fuel economy may not be obtained.
- the content of silica is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, with respect to 100 parts by mass of the rubber component. If the amount is less than 5 parts by mass, the effect of reducing tan ⁇ and improving the elongation at break by blending silica may not be sufficiently obtained.
- the content of silica is preferably 40 parts by mass or less, more preferably 30 parts by mass or less. If the amount is more than 40 parts by mass, it is difficult to disperse the silica, and the processability may be deteriorated. In addition, the extruded material may shrink unevenly as it cools after extrusion, and the uniformity may deteriorate.
- the total content of carbon black and silica is 20 parts by mass or more, preferably 30 parts by mass or more, with respect to 100 parts by mass of the rubber component. If the amount is less than 20 parts by mass, sufficient steering stability may not be obtained.
- the total content is 40 parts by mass or less, preferably 38 parts by mass or less. If the amount is more than 40 parts by mass, sufficient fuel economy may not be obtained.
- the rubber composition contains the above-mentioned components, good steering stability, breaking resistance and breaking elongation can be obtained even with a small amount of carbon black and silica within the above range.
- the carbon black may be used in combination of two carbon blacks (1) and (2) different in N 2 SA, which significantly improves the steering stability, the breaking resistance, the breaking elongation, and the spew breakage. Can be effectively suppressed.
- the N 2 SA of carbon black (1) is preferably 25 to 50 m 2 / g
- the N 2 SA of carbon black (2) is preferably 100 to 120 m 2 / g.
- the content of the carbon black (1) is preferably 5 to 30 parts by mass with respect to 100 parts by mass of the rubber component because the above-mentioned improvement effect is favorably obtained.
- the content of is preferably 5 to 30 parts by mass.
- Silica is preferably used in combination with a silane coupling agent.
- silane coupling agent any silane coupling agent conventionally used in combination with silica can be used in the rubber industry, and examples thereof include sulfides such as bis (3-triethoxysilylpropyl) disulfide, 3- Mercapto, such as mercaptopropyltrimethoxysilane, vinyl, such as vinyltriethoxysilane, amino, such as 3-aminopropyltriethoxysilane, glycidoxy of ⁇ -glycidoxypropyltriethoxysilane, 3-nitropropyltrimethoxy Examples thereof include nitros such as silanes and chloros such as 3-chloropropyltrimethoxysilane.
- silane coupling agent is preferably 1 to 15 parts by mass with respect to 100 parts by mass of silica.
- the rubber composition of the present invention contains zinc oxide.
- Zinc oxide has an effect of temporarily adsorbing sulfur and causing the vulcanization reaction to proceed gradually, and can suppress reversion.
- zinc oxide combines with stearic acid to form zinc stearate (unsaturated fatty acid soap), and the zinc stearate blooms on the surface of spew to improve releasability. These actions can effectively suppress the occurrence of spew breakage.
- the zinc oxide is not particularly limited, and those widely used in the tire industry can be used, and examples thereof include zinc oxide No. 1 to 3.
- the content of zinc oxide is 3.6 parts by mass or more, preferably 3.8 parts by mass or more, per 100 parts by mass of the rubber component. If the amount is less than 3.6 parts by mass, reversion can not be sufficiently suppressed, and spew breakage tends to occur easily.
- the content is 16 parts by mass or less, preferably 10 parts by mass or less. If it exceeds 16 parts by mass, sufficient breaking resistance and breaking elongation may not be ensured.
- compounding agents conventionally used in the rubber industry such as stearic acid, resin, oil, various anti-aging agents, sulfur, vulcanization accelerator, mold release agent etc. It can be blended.
- the rubber composition of the present invention preferably contains stearic acid.
- stearic acid By blending stearic acid, the vulcanization reaction can be activated, and an appropriate crosslink density, and further, high E * can be obtained. Further, as described above, by using stearic acid and zinc oxide in combination, zinc stearate can be formed to improve releasability.
- the stearic acid is not particularly limited, and those widely used in the tire industry can be used.
- the content of stearic acid is preferably 1.5 parts by mass or more, more preferably 2.0 parts by mass or more, based on 100 parts by mass of the rubber component. If the amount is less than 1.5 parts by mass, the amount of zinc stearate produced is small, and there is a possibility that the releasability can not be sufficiently improved.
- the content is preferably 4.0 parts by mass or less, more preferably 3.0 parts by mass or less. If it exceeds 4.0 parts by mass, reversion may easily occur.
- the rubber composition of the present invention preferably contains a release agent.
- the spew can be slippery in the spew hole, and spew breakage can be further suppressed.
- a mold release agent a mixture of a fatty acid metal salt and a fatty acid amide or zinc stearate can be suitably used.
- the content of the release agent is preferably 1 to 5 parts by mass with respect to 100 parts by mass of the rubber component.
- the rubber composition of the present invention preferably contains a resin.
- the resin is not particularly limited, but a C5 petroleum resin is preferable because the effects of the present invention can be favorably obtained.
- the C5 petroleum resin is an aliphatic petroleum resin mainly composed of olefins and diolefins in a C5 fraction obtained by naphtha decomposition.
- the softening point of the above-mentioned resin is preferably 50 ° C. or more, more preferably 80 ° C. or more, preferably 150 ° C. or less, more preferably 120 ° C. or less.
- the softening point is a temperature at which the softening point defined in JIS K 6220: 2001 is measured by a ring and ball type softening point measuring device and the sphere is lowered.
- the content of the resin is preferably 0.5 parts by mass or more, and more preferably 1.5 parts by mass or more, with respect to 100 parts by mass of the rubber component. If the amount is less than 0.5 parts by mass, the effect of compounding the resin may not be sufficiently obtained. Further, the content is preferably 5 parts by mass or less, more preferably 2.5 parts by mass or less. If it exceeds 5 parts by mass, sufficient fuel economy tends not to be obtained.
- the rubber composition of the present invention preferably contains a vulcanization accelerator.
- the vulcanization accelerator is not particularly limited, and those widely used in the tire industry can be used, for example, N-tert-butyl-2-benzothiazolylsulfenamide (TBBS), N-cyclohexyl-2-benzo-z Thiazolylsulfenamide (CBS), N, N'-dicyclohexyl-2-benzothiazolylsulfenamide (DZ), mercaptobenzothiazole (MBT), dibenzothiazolyl disulfide (MBTS), diphenyl guanidine (DPG), etc.
- TBBS can be preferably used.
- the content of the vulcanization accelerator is preferably 0.1 to 1.8 parts by mass, and more preferably 0.5 to 1.8 parts by mass with respect to 100 parts by mass of the rubber component, from the viewpoint that the effects of the present invention can be favorably obtained. It is 1.2 parts by mass.
- the above-mentioned components are kneaded using a rubber kneading apparatus such as an open roll or a Banbury mixer and then vulcanized. It can be manufactured.
- a rubber kneading apparatus such as an open roll or a Banbury mixer
- spew breakage due to reversion tends to occur.
- the vulcanization temperature is as low as about 160 ° C., spew breakage hardly occurs, but the production efficiency tends to be significantly reduced.
- the rubber composition of the present invention can suppress the occurrence of spew breakage, it is difficult for the spew breakage to occur even when the vulcanizing temperature is set to 160 to 190 ° C. under conditions where reversion easily occurs. Can ensure good productivity.
- the pneumatic tire of the present invention can be produced by the usual method using the above rubber composition. That is, the rubber composition is extruded at the unvulcanized stage according to the shape of the sidewall, molded by a usual method on a tire molding machine, and bonded together with other tire members to obtain an unvulcanized tire. Form.
- the unvulcanized tire can be heated and pressurized in a vulcanizer to produce a tire.
- NR TSR20 IR: IR 2200 manufactured by JSR Corporation End-modified BR1: BR 1250H manufactured by Nippon Zeon Co., Ltd.
- End-modified BR2 (Tin-modified BR polymerized using a lithium initiator, vinyl content: 10 to 13% by mass, Mw / Mn: 1.5, tin atom content: 250 ppm)
- End-modified BR2 N103 manufactured by Asahi Kasei Chemicals Corporation (modified BR polymerized using a lithium initiator, vinyl content: 12% by mass, Mw / Mn: 1.19, Mw: 550,000)
- End-modified BR3 Modified butadiene rubber manufactured by Sumitomo Chemical Co., Ltd.
- BR2 BUNA-CB22 (BR synthesized using an Nd-based catalyst, cis content: 97% by mass, vinyl content: 0.6% by mass, ML 1 + 4 (100 ° C.): 63, Mw / Mn: 1 made by LANXESS Corporation .60, Mw: 590,000, Mn: 370,000)
- BR3 VCR 617 (SPB-containing BR, SPB content: 17% by mass, SPB melting point: 200 ° C., boiling n-hexane insoluble matter content: 15 to 18% by mass) manufactured by Ube Industries, Ltd.
- Carbon black 1 Show black N220 (N 2 SA: 114 m 2 / g) manufactured by Cabot Japan Ltd.
- Carbon black 2 Show black N 550 (N 2 SA: 40 m 2 / g) manufactured by Cabot Japan Ltd.
- Silica 1 EVonic Degussa VN 3 (N 2 SA: 175 m 2 / g)
- Silica 2 Rhodia Z1085 Gr (N 2 SA: 90 m 2 / g)
- Oil VivaTec 500 (TDAE oil) manufactured by H & R Ltd.
- Zinc oxide Zinc flower 2 type stearic acid manufactured by Mitsui Mining & Smelting Co., Ltd .: Release agent manufactured by NOF Corporation 1: WB16 (fatty acid metal salt (fatty acid metal salt (fatty acid calcium)) and fatty acid amide blend)
- Release agent 2 Zinc stearate wax manufactured by NOF Corporation: Ozo Ace 0355 manufactured by Nippon Seiwa Co., Ltd.
- Antiaging agent 6PPD Antigen 6C (N-phenyl-N '-(1,3-dimethylbutyl) -p-phenylenediamine) manufactured by Sumitomo Chemical Co., Ltd. 10% oil-containing insoluble sulfur: Seimisulfur (insoluble sulfur 60% or more of insoluble matter due to carbon disulfide, oil content: 10% by mass) (manufactured by Nippon Denryo Kogyo Co., Ltd.) (values in Tables 1 and 2 are pure sulfur content) Show) Vulcanization accelerator TBBS: Noccellar NS (N-tert-butyl-2-benzothiazolylsulfenamide) manufactured by Ouchi Shinko Chemical Co., Ltd.
- the smoothest edge is the best in the edge state, and with regard to the degree of burning of the rubber, in a 2 mm sheet of 15 cm square cut out from the above-mentioned molded article, a state without unevenness due to pits burned rubber lumps With respect to the flatness, the state in which the sheet was flat and in close contact with the flat plate was evaluated as good.
- carbon black and / or silica having a specific nitrogen adsorption specific surface area and a predetermined amount of zinc oxide are respectively blended with the rubber component contained, fuel economy, steering stability, breaking resistance, elongation at break
- the processability was improved in a well-balanced manner, and the occurrence of spew was also suppressed.
- Example 1 using tin-modified BR as the terminal-modified BR was significantly improved in fuel economy as compared with Examples 19 and 20 using other terminal-modified BR.
- the comparative example was inferior in performance as compared with the example because any component was out of the specific range. In addition, there was a performance that did not reach the target value, and the balance of performance was bad.
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Abstract
Description
なお、本明細書において、重量平均分子量(Mw)、数平均分子量(Mn)は、ゲルパーミエーションクロマトグラフ(GPC)(東ソー(株)製GPC-8000シリーズ、検出器:示差屈折計、カラム:東ソー(株)製のTSKGEL SUPERMULTIPORE HZ-M)による測定値を基に標準ポリスチレン換算により求めることができる。
なお、シス含量は、赤外吸収スペクトル分析法によって測定できる。
なお、ビニル含量は、赤外吸収スペクトル分析法によって測定できる。
(式(1)中、R1、R2及びR3は、同一若しくは異なって、アルキル基、アルコキシ基、シリルオキシ基、アセタール基、カルボキシル基(-COOH)、メルカプト基(-SH)又はこれらの誘導体を表す。R4及びR5は、同一若しくは異なって、水素原子又はアルキル基を表す。nは整数を表す。)
なお、カーボンブラックのN2SAは、JIS K 6217-2:2001によって求められる。
なお、シリカのN2SAは、ASTM D3037-81に準じてBET法で測定される値である。
なお、上記ゴム組成物は、前述の成分を含有するため、上記範囲内のような少量のカーボンブラック及びシリカであっても、良好な操縦安定性、破断抗力、破断伸びが得られる。
シランカップリング剤としては、ゴム工業において、従来からシリカと併用される任意のシランカップリング剤を使用することができ、例えば、ビス(3-トリエトキシシリルプロピル)ジスルフィドなどのスルフィド系、3-メルカプトプロピルトリメトキシシランなどのメルカプト系、ビニルトリエトキシシランなどのビニル系、3-アミノプロピルトリエトキシシランなどのアミノ系、γ-グリシドキシプロピルトリエトキシシランのグリシドキシ系、3-ニトロプロピルトリメトキシシランなどのニトロ系、3-クロロプロピルトリメトキシシランなどのクロロ系などが挙げられる。中でも、スルフィド系が好ましく、ビス(3-トリエトキシシリルプロピル)ジスルフィドがより好ましい。シランカップリング剤の含有量は、シリカ100質量部に対して、好ましくは1~15質量部である。上記範囲内であると、低燃費性、操縦安定性及び加工性をバランス良く改善できる。
なお、本明細書において、軟化点とは、JIS K6220:2001に規定される軟化点を環球式軟化点測定装置で測定し、球が降下した温度である。
NR:TSR20
IR:JSR(株)製のIR2200
末端変性BR1:日本ゼオン(株)製のBR1250H(リチウム開始剤を用いて重合したスズ変性BR、ビニル含量:10~13質量%、Mw/Mn:1.5、スズ原子の含有量:250ppm)
末端変性BR2:旭化成ケミカルズ(株)製のN103(リチウム開始剤を用いて重合した変性BR、ビニル含量:12質量%、Mw/Mn:1.19、Mw:55万)
末端変性BR3:住友化学(株)製の変性ブタジエンゴム(リチウム開始剤を用いて重合したS変性BR、ビニル含量:26質量%、Mw/Mn:1.34、Mw:67万)(R1、R2及びR3=-OCH3、R4及びR5=-CH2CH3、n=3)
BR1:宇部興産(株)製のBR150B(ハイシスBR)
BR2:ランクセス社製のBUNA-CB22(Nd系触媒を用いて合成したBR、シス含量:97質量%、ビニル含量:0.6質量%、ML1+4(100℃):63、Mw/Mn:1.60、Mw:59万、Mn:37万)
BR3:宇部興産(株)製のVCR617(SPB含有BR、SPBの含有量:17質量%、SPBの融点:200℃、沸騰n-ヘキサン不溶物の含有量:15~18質量%)
カーボンブラック1:キャボットジャパン(株)製のショウブラックN220(N2SA:114m2/g)
カーボンブラック2:キャボットジャパン(株)製のショウブラックN550(N2SA:40m2/g)
シリカ1:エボニックデグッサ社製のVN3(N2SA:175m2/g)
シリカ2:ローディア社製のZ1085Gr(N2SA:90m2/g)
シランカップリング剤:エボニックデグッサ社製のSi75(ビス(3-トリエトキシシリルプロピル)ジスルフィド)
レジン:丸善石油化学(株)製のマルカレッツT-100AS(C5系石油樹脂:ナフサ分解によって得られるC5留分中のオレフィン、ジオレフィン類を主原料とする脂肪族系石油樹脂)(軟化点:100℃)
オイル:H&R(株)製のVivaTec500(TDAEオイル)
酸化亜鉛:三井金属鉱業(株)製の亜鉛華2種
ステアリン酸:日油(株)製の椿
離型剤1:ストラクトール社製のWB16(脂肪酸金属塩(脂肪酸カルシウム)と脂肪酸アミドとの混合物)
離型剤2:日油(株)製のステアリン酸亜鉛
ワックス:日本精蝋(株)製のオゾエース0355
老化防止剤6PPD:住友化学(株)製のアンチゲン6C(N-フェニル-N’-(1,3-ジメチルブチル)-p-フェニレンジアミン)
10%オイル含有不溶性硫黄:日本乾溜工業(株)製のセイミサルファー(二硫化炭素による不溶物60%以上の不溶性硫黄、オイル分:10質量%)(表1、2の値は、純硫黄分量を示す)
加硫促進剤TBBS:大内新興化学工業(株)製のノクセラーNS(N-tert-ブチル-2-ベンゾチアゾリルスルフェンアミド)
表1、2に示す配合に従って、1.7Lバンバリーミキサーを用いて、硫黄及び加硫促進剤以外の薬品を混練りした。次に、オープンロールを用いて、得られた混練り物に硫黄及び加硫促進剤を添加して練り込み、未加硫ゴム組成物を得た。
得られた未加硫ゴム組成物をプレス加硫し、加硫ゴム組成物を得た。
得られた未加硫ゴム組成物をサイドウォールに用いて未加硫タイヤを作製し、加硫することで、試験用タイヤ(サイズ:245/40R18)を作製した。
なお、加硫温度(タイヤ金型設定温度)は表1、2に示す条件とした。
(株)岩本製作所製の粘弾性スペクトロメータVESを用いて、温度70℃、周波数10Hz、初期伸縮歪10%及び動歪2%の条件下で、上記加硫ゴム組成物の複素弾性率E*(MPa)及び損失正接tanδを測定した。E*が大きいほど剛性が高く、操縦安定性に優れることを示し、tanδが小さいほど発熱が少なく、低燃費性に優れることを示す。
上記加硫ゴム組成物からなる3号ダンベル型試験片を用いて、JIS K 6251:2010「加硫ゴム及び熱可塑性ゴム-引張特性の求め方」に準じて、常温にて引張試験を実施し、破断伸びEB(%)及び破断抗力TB(MPa)を測定した。
上記試験用タイヤのデモールド時にサイドウォールに発生したスピュー切れの数をタイヤ本数100本以上についてカウントし、以下の計算式により、各配合のスピュー切れの発生数を指数表示した。指数が大きいほど、スピュー切れが発生しにくいことを示す。
(スピュー切れ発生指数)=(実施例13のスピュー切れ発生数)/(各配合のスピュー切れ発生数)×100
各未加硫ゴム組成物について、押出し後の各未加硫ゴム組成物を所定のサイドウォールの形状に成形した成形品のエッジ状態、ゴムの焼け度合い、ゴム同士の粘着度合い、平坦さを目視、触覚により評価し、実施例13を100として指数表示した。数値が大きいほど、加工性(押出し加工性)が優れることを示している。
なお、エッジ状態については、最もエッジが真っ直ぐで滑らかな状態を良好とし、ゴムの焼け度合いについては、上記成形品から切り出した15cm角の2mmシートにおいて、ピッツ焼けゴム塊による凹凸がない状態を良好とし、平坦さについては、該シートが平坦で平面板に密着する状態を良好として評価した。
転がり抵抗試験機を用い、JIS標準中心リム、内圧(230kPa)、荷重(3.43kN)、速度(80km/h)で、JIS D 4234:2009に従い、上記試験用タイヤの転がり抵抗を測定し、以下の計算式から転がり抵抗の改善率(転がり抵抗の低下率)を算出した。
転がり抵抗の改善率=(比較例1の転がり抵抗-各配合の転がり抵抗)/(比較例1の転がり抵抗)×100
Claims (6)
- ゴム成分100質量%中、1,2-シンジオタクチックポリブタジエン結晶を含むブタジエンゴム及び希土類系触媒を用いて合成されたブタジエンゴムの合計含有量が5~60質量%、末端変性ブタジエンゴムの含有量が7~60質量%、イソプレン系ゴムの含有量が20~70質量%であり、
前記ゴム成分100質量部に対して、窒素吸着比表面積25~120m2/gのカーボンブラック及び窒素吸着比表面積70~250m2/gのシリカの合計含有量が20~40質量部、酸化亜鉛の含有量が3.6~16質量部であるサイドウォール用ゴム組成物。 - 前記カーボンブラックの窒素吸着比表面積が25~45m2/gであり、
前記ゴム成分100質量部に対して、前記カーボンブラックの含有量が15~38質量部である請求項1記載のサイドウォール用ゴム組成物。 - 前記ゴム成分100質量%中、前記1,2-シンジオタクチックポリブタジエン結晶を含むブタジエンゴム及び前記希土類系触媒を用いて合成されたブタジエンゴムの合計含有量が10~40質量%、前記末端変性ブタジエンゴムの含有量が25~50質量%、前記イソプレン系ゴムの含有量が30~60質量%である請求項1又は2記載のサイドウォール用ゴム組成物。
- 前記末端変性ブタジエンゴムがスズ変性ブタジエンゴムである請求項1~3のいずれかに記載のサイドウォール用ゴム組成物。
- 160~190℃の加硫温度で加硫して得られる請求項1~4のいずれかに記載のサイドウォール用ゴム組成物。
- 請求項1~5のいずれかに記載のゴム組成物を用いて作製したサイドウォールを有する空気入りタイヤ。
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CN113788992B (zh) * | 2021-07-27 | 2023-03-31 | 中策橡胶集团股份有限公司 | 一种白炭黑补强的胎侧胶料及其混炼方法和轮胎 |
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EP2905305A1 (en) * | 2014-01-08 | 2015-08-12 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
CN109890627A (zh) * | 2016-10-31 | 2019-06-14 | 米其林集团总公司 | 包含特定增强填料的橡胶组合物 |
US11161962B2 (en) | 2016-10-31 | 2021-11-02 | Compagnie Generale Des Etablissements Michelin | Rubber composition comprising a specific reinforcing filler |
CN109890627B (zh) * | 2016-10-31 | 2021-12-17 | 米其林集团总公司 | 包含特定增强填料的橡胶组合物 |
JPWO2018168313A1 (ja) * | 2017-03-15 | 2020-01-16 | 住友ゴム工業株式会社 | サイドウォール用ゴム組成物及び空気入りタイヤ |
JP7156026B2 (ja) | 2017-03-15 | 2022-10-19 | 住友ゴム工業株式会社 | サイドウォール用ゴム組成物及び空気入りタイヤ |
US11453184B2 (en) | 2017-05-26 | 2022-09-27 | The Yokohama Rubber Co., Ltd. | Puncture repair kit container |
WO2018221595A1 (ja) * | 2017-06-01 | 2018-12-06 | 横浜ゴム株式会社 | ゴム組成物および空気入りタイヤ |
JPWO2018221595A1 (ja) * | 2017-06-01 | 2020-02-27 | 横浜ゴム株式会社 | ゴム組成物および空気入りタイヤ |
US11339276B2 (en) | 2017-06-01 | 2022-05-24 | The Yokohama Rubber Co., Ltd. | Rubber composition and pneumatic tire |
Also Published As
Publication number | Publication date |
---|---|
EP2733169A4 (en) | 2015-05-06 |
EP2733169A1 (en) | 2014-05-21 |
JP2013018868A (ja) | 2013-01-31 |
CN103649201A (zh) | 2014-03-19 |
EP2733169B1 (en) | 2016-09-14 |
KR20140041521A (ko) | 2014-04-04 |
US20140090764A1 (en) | 2014-04-03 |
US9273197B2 (en) | 2016-03-01 |
JP5503598B2 (ja) | 2014-05-28 |
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