KR101140248B1 - Tread rubber composition and tire manufactured by using the same - Google Patents

Abstract

The present invention relates to a rubber composition for a tire tread and a tire manufactured using the same, wherein the solution-polymerized styrene butadiene rubber having a styrene content of 20 to 30% by weight and a vinyl content of butadiene is 50 to 60% by weight (S- SBR) 100 parts by weight of the raw material rubber including 70 to 90 parts by weight and 10 to 30 parts by weight of butadiene rubber (BR), and 60 to 90 parts by weight of silica, wherein the solution-polymerized styrene butadiene rubber is alkoxy silane ( Alkoxy Silane) and molecules are coupled to each other by silicon (Si).

The rubber composition for tire tread maximizes low fuel efficiency by reducing hysteresis, and also has excellent braking performance that can be reduced due to maximization of low fuel efficiency, so that the workability in the unvulcanized state, the braking performance in a vulcanized state, abrasion performance and rotational resistance are excellent. The characteristics can all be improved.

Tire, Tread, Styrene Butadiene Rubber, SBR, Butadiene Rubber, BR, Coupling, Silicon, Modified, Hysteresis, Low Fuel Efficiency, Braking Performance, Workability, Wear Performance, Rolling Resistance

Description

Rubber composition for tire treads and tires manufactured using the same {TREAD RUBBER COMPOSITION AND TIRE MANUFACTURED BY USING THE SAME}

The present invention relates to a rubber composition for a tire tread and a tire manufactured using the same, more particularly, a rubber composition for a tire tread that has excellent processability in an unvulcanized state, and improves braking performance, wear performance, and low fuel consumption performance. It relates to a tire manufactured using the same.

Recently, due to the high performance of passenger cars, consumers are demanding high performance of tires, and in particular, the demand for tires that combines abrasion resistance, handling performance, ride performance, wet braking performance and low fuel consumption. Applications are being actively reviewed. In order to develop a tire having the abrasion resistance, the handling performance, the ride performance, the wet braking property and the low fuel consumption at the same time, a lot of research has been made especially in the field of materials.

In general, hysteresis losses are reduced by reducing the amount of reinforcing filler used to reduce rolling resistance, which is related to the fuel economy performance of the tire, thereby reducing the interaction between the reinforcing agent and the reinforcing agent.

However, this technique has the disadvantage that as the content of the reinforcing filler is reduced, the braking performance and the adjustment stability performance, which are important characteristics of the tire tread, are reduced.

As such, when tire wear performance and fuel efficiency are improved in the current tire material development technology, the braking performance may be deteriorated, and when the tire braking performance is improved, fuel economy performance is deteriorated or wear performance is deteriorated. Occurs. Thus, each performance of a tire shows that when one performance is improved, the other performance is degraded. Therefore, the development of a technology capable of improving one performance while minimizing the other performance degradation or further improving both performances at the same time. This is necessary.

It is an object of the present invention to provide a rubber composition for tire treads which is excellent in processability in an unvulcanized state and which improves braking performance, wear performance and low fuel consumption performance.

Another object of the present invention is to provide a tire manufactured using the rubber tread rubber composition.

In order to achieve the above object, the rubber composition for a tire tread according to an embodiment of the present invention has a styrene content of 20 to 30% by weight, butadiene solution containing 50 to 60% by weight of vinyl polymer solution styrene butadiene rubber ( S-SBR) 100 parts by weight of the raw material rubber including 70 to 90 parts by weight and 10 to 30 parts by weight of butadiene rubber (BR), and 60 to 90 parts by weight of silica, wherein the solution-polymerized styrene butadiene rubber is alkoxy It is denatured to silane (Alkoxy Silane), and the molecules are coupled to each other by silicon (Si).

The silica may have a nitrogen adsorption specific surface area of 150 to 185 m 2 / g and a CTAB (cetyltrimethyl ammonium bromide) adsorption specific surface area of 150 to 170 m 2 / g.

According to another embodiment of the present invention provides a tire manufactured using the rubber tread rubber composition.

Hereinafter, the present invention will be described in more detail.

The tire tread rubber composition includes styrene butadiene rubber and raw rubber including butadiene rubber, and silica.

The styrene butadiene rubber is preferably used in an amount of 70 to 90 parts by weight for optimum rotational resistance performance. When the content of the styrene butadiene rubber is more than 90 parts by weight, the wear performance may be reduced, and the rotation is less than 70 parts by weight. Resistance characteristics and braking performance may be degraded.

The styrene butadiene rubber includes a solution-polymerized styrene butadiene rubber having a styrene content of 20 to 30% by weight and a vinyl content of 50 to 60% by weight of butadiene. When using the styrene butadiene rubber having a styrene content of 20 to 30% by weight, the low fuel efficiency is excellent due to the microstructure advantageous for rotational resistance.

The styrene butadiene rubber includes emulsion-polymerized styrene-butadiene rubber (Emulsion-polymerized Styrene Butadiene Rubber, E-SBR), solution-polymerized styrene-butadiene rubber (S-SBR).

The solution polymerized styrene butadiene rubber (S-SBR) is generally prepared by a continuous method and a batch method. The solution polymerized styrene butadiene rubber may in particular be prepared by a batch method. The solution-polymerized styrene butadiene rubber prepared by the continuous method has a slightly better processability than the solution-polymerized styrene butadiene rubber prepared by the batch method, but due to the large amount of low molecular weight material, hysteresis loss is generated, resulting in low fuel efficiency. It is disadvantageous. On the other hand, the solution-polymerized styrene butadiene rubber prepared by the batch method has a molecular weight distribution (MWD) of 1.3 to 1.5, which shows a narrower molecular weight distribution than the continuous styrene butadiene rubber, which is advantageous in rotational resistance performance and low fuel consumption performance.

The solution-polymerized styrene butadiene rubber may be one in which the ends of molecules are modified with alkoxy silane, and the molecules are coupled to each other by silicon (Si).

The solution-polymerized styrene butadiene rubber modified at the end of the alkoxy silane improves the dispersibility of silica to increase the interaction between silica and rubber, thereby improving the low fuel efficiency of the rubber, and connecting each molecule through silicon coupling to hysteresis. By reducing the number of ends of the molecules that cause the can maximize the fuel economy performance. Moreover, it is excellent in workability and low fuel consumption performance.

The alkoxy silane means a silane compound containing an alkoxy group. The terminal alkoxy silane modified at the end of the solution-polymerized styrene butadiene rubber modified with the alkoxy silane may be represented by the following formula (1).

[Formula 1]

In Chemical Formula 1,

R ₁ and R ₃ are each independently hydrogen, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a heteroalkyl group having 1 to 15 carbon atoms, a cycloalkyl group having 3 to 15 carbon atoms, a heterocycloalkyl group having 3 to 15 carbon atoms, and 1 to C carbon atoms Any one selected from the group consisting of 15 alkoxy groups and combinations thereof, preferably hydrogen, a halogen element, an alkyl group having 1 to 10 carbon atoms, a heteroalkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, and Any one made in the group consisting of a combination.

R ₂ is selected from hydrogen, a halogen atom, an alkyl group having 1 to 15 carbon atoms, a heteroalkyl group having 1 to 15 carbon atoms, a cycloalkyl group having 3 to 15 carbon atoms, a heterocycloalkyl group having 3 to 15 carbon atoms, and a combination thereof One, preferably hydrogen, a halogen element, an alkyl group having 1 to 10 carbon atoms, a heteroalkyl group having 1 to 10 carbon atoms, and a combination thereof.

The heteroalkyl group means that the carbon atom in the alkyl group is substituted with one to three heteroatoms selected from the group consisting of N, O, S and P, wherein the heterocycloalkyl group is a carbon atom in the cycloalkyl group is N, O, Mean substituted by 1 to 3 hetero atoms selected from the group consisting of S and P. The halogen atom means any one selected from the group consisting of fluorine, chlorine, bromine and iodine.

Specifically, the solution-polymerized styrene butadiene rubber terminal-modified with the alkoxy silane is propyltrimethoxysilane, propyltriethoxysilane, N-hexyltrimethoxysilane, methyldimethoxysilane, phenyltrimethoxysilane, vinylbenzyl The terminal may be modified with an alkoxy silane compound, which is any one selected from the group consisting of -aminomethyl-aminopropyl-triethoxysilane, mercaptotrimethoxysilane, and a combination thereof.

The solution-polymerized styrene butadiene rubber terminally modified with the alkoxy silane may be prepared by polymerizing butadiene monomer, vinyl monomer and alkoxy silane under an inert solvent.

As the butadiene monomer, 1,3-butadiene is representative, but not limited thereto, and the vinyl monomer is styrene but is not limited thereto. The inert solvent may be any one selected from the group consisting of benzene, toluene, xylene, pentane, hexane, heptane, isooxane, cyclohexane, and combinations thereof, but is not limited thereto. Any inert solvent may be used.

A polymerization initiator may be used to prepare a solution-polymerized styrene butadiene rubber terminal-modified with the alkoxy silane, and the polymerization initiator may be an alkali metal, an alkaline earth metal, or the like, and may be selected from the group consisting of lithium, barium, and combinations thereof. Any one selected may be used, but the present invention is not limited thereto.

The polymerization can be carried out continuously or discontinuously at 20 to 120 ℃.

The solution-polymerized styrene butadiene rubber terminally modified with the alkoxy silane may be molecules coupled to each other by silicon.

The method of coupling the solution-polymerized styrene butadiene rubber terminally modified with the alkoxy silane by silicon may be performed by a method known in the art, but is not limited to the specific method in the present invention.

In the method of coupling the solution-modified styrene butadiene rubber terminal-modified with alkoxy silane by silicon, a polymerization initiator in the form of a double anion is added to a mixed solution of styrene and butadiene, followed by polymerization while stirring and then a chlorinated coupling agent as a terminator. Further agitation by adding tin may be a method in which radicals reactive at the ends of the styrene-butadiene polymer react with tin chloride to couple each polymer through tin.

The butadiene rubber can be used as long as butadiene rubber used in the rubber composition for tires. The butadiene rubber may be included in an amount of 10 to 30 parts by weight. When the butadiene rubber is used in an amount of more than 30 parts by weight, the braking performance may be reduced because the ratio of butadiene rubber, which is relatively weak in rubber strength, may be lowered, and less than 10 parts by weight. If used as, there may be a problem that the wear performance is reduced.

The butadiene rubber may preferably be used butadiene rubber containing no oil. When the butadiene rubber does not contain oil, there is an advantageous effect in low fuel efficiency and workability.

The tire tread rubber composition comprises silica as a reinforcing filler.

The silica has a nitrogen adsorption specific surface area of 150 to 185 m 2 / g, CTAB (cetyltrimethyl ammonium bromide) adsorption specific surface area of 150 to 170 m 2 / g in order to obtain a tread rubber composition suitable for the purpose of the present invention It is more preferable to use silica having a nitrogen adsorption specific surface area of 160 to 185 m 2 / g and a CTAB (cetyltrimethyl ammonium bromide) adsorption specific surface area of 155 to 165 m 2 / g.

The silica may be used in an amount of 60 to 90 parts by weight based on 100 parts by weight of the raw material rubber, and when the content of the silica exceeds 90 parts by weight, the rotational resistance may be reduced. Can be.

The silica may be any of those produced by a wet method or a dry method, and commercially available products may include ultrasil VN2 (manufactured by Degussa), ultrasil VN3 (manufactured by Degussa) and the like, but the present invention is not limited thereto.

The tire tread rubber composition may further include a coupling agent to improve dispersibility of the silica.

Examples of the coupling agent include sulfide coupling agents, mercapto coupling agents, vinyl coupling agents, amino coupling agents, glycidoxy clock coupling agents, nitro coupling agents, chloro coupling agents, methacryl coupling agents, and combinations thereof. It may be any one selected from the group consisting of.

The sulfide coupling agent is bis (3-triethoxysilylpropyl) tetrasulfide, bis (2-triethoxysilylethyl) tetrasulfide, bis (4-triethoxysilylbutyl) tetrasulfide, bis (3-tri Methoxysilylpropyl) tetrasulfide, bis (2-trimethoxysilylethyl) tetrasulfide, bis (4-trimethoxysilylbutyl) tetrasulfide, bis (3-triethoxysilylpropyl) trisulfide, bis (2 -Triethoxysilylethyl) trisulfide, bis (4-triethoxysilylbutyl) trisulfide, bis (3-trimethoxysilylpropyl) trisulfide, bis (2-trimethoxysilylethyl) trisulfide, Bis (4-trimethoxysilylbutyl) trisulfide, bis (3-triethoxysilylpropyl) disulfide, bis (2-triethoxysilylethyl) disulfide, bis (4-triethoxysilylbutyl) disulfide, bis (3-trimethoxysilylpropyl) disulfide, bis (2-trimethoxy Silylethyl) disulfide, bis (4-trimethoxysilylbutyl) disulfide, 3-trimethoxysilylpropyl-N, N-dimethylthiocarbamoyltetrasulfide, 3-triethoxysilylpropyl-N, N-dimethylthio Carbamoyl tetrasulfide, 2-triethoxysilylethyl-N, N-dimethylthiocarbamoyl tetrasulfide, 2-trimethoxysilylethyl-N, N-dimethylthiocarbamoyl tetrasulfide, 3-trimethoxysilylpropyl Benzothiazolyl tetrasulfide, 3-triethoxysilylpropylbenzothiazole tetrasulfide, 3-trimethoxysilylpropyl methacrylate monosulfide, 3-trimethoxysilylpropyl methacrylate monosulfide and combinations thereof It may be any one selected from the group.

The mercapto-based coupling agent is 3-mercaptopropyltrimethoxysilane, 3-mercaptotopropyltriethoxysilane, 2-mercaptoethyltrimethoxysilane, 2-mercaptotoethyltriethoxysilane and combinations thereof It may be any one selected from the group consisting of. The vinyl coupling agent may be any one selected from the group consisting of ethoxysilane, vinyltrimethoxysilane, and combinations thereof. The amino-based coupling agent is 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3- (2-aminoethyl) aminopropyltriethoxysilane, 3- (2-aminoethyl) aminopropyltri It may be any one selected from the group consisting of methoxysilane and combinations thereof.

The glycidoxy clock coupling agent γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropylmethyldimethoxysilane And combinations thereof may be any one selected from the group consisting of. The nitro-based coupling agent may be any one selected from the group consisting of 3-nitropropyltrimethoxysilane, 3-nitropropyltriethoxysilane, and combinations thereof. The chloro-based coupling agent is selected from the group consisting of 3-chloropropyltrimethoxysilane, 3-chloropropyltriethoxysilane, 2-chloroethyltrimethoxysilane, 2-chloroethyltriethoxysilane and combinations thereof It can be any one.

The methacrylic silane compound is any one selected from the group consisting of γ-methacryloxypropyl trimethoxysilane, γ-methacryloxypropyl methyldimethoxysilane, γ-methacryloxypropyl dimethyl methoxysilane, and combinations thereof Can be.

The coupling agent may be included in an amount of 4.8 to 7.2 parts by weight based on 100 parts by weight of the raw material rubber. When the content of the coupling agent is less than 4.8 parts by weight, the reaction with silica may be insufficient, resulting in deterioration of the processability of the rubber or low fuel consumption performance. When the content of the coupling agent exceeds 7.2 parts by weight, the interaction between silica and rubber may be so strong that the low fuel consumption performance may be reduced. It can be excellent but the braking performance can be very poor.

The tire tread rubber composition may optionally further include various additives such as additional vulcanizing agents, vulcanization accelerators, vulcanization accelerators, anti-aging agents and softeners. The various additives can be used as long as it is commonly used in the field of the present invention, the content thereof is not particularly limited, depending on the compounding ratio used in the conventional tire tread rubber composition.

As the vulcanizing agent, metal oxides such as sulfur vulcanizing agents, organic peroxides, resin vulcanizing agents, and magnesium oxide can be used.

The sulfur-based vulcanizing agents include inorganic vulcanizing agents such as powdered sulfur (S), insoluble sulfur (S), precipitated sulfur (S) and colloidal sulfur, tetramethylthiuram disulfide (TMTD) and tetraethyl. Organic vulcanizing agents such as tetraethyltriuram disulfide (TETD) and dithiodimorpholine can be used. Specifically, as the sulfur vulcanizing agent, a vulcanizing agent which produces elemental sulfur or sulfur, for example, amine disulfide, polymer sulfur, or the like can be used.

The organic peroxide may be benzoyl peroxide, dicumyl peroxide, di-t-butyl peroxide, t-butyl cumyl peroxide, methyl ethyl ketone peroxide, cumene hydroperoxide, 2,5-dimethyl-2,5-di ( t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 1,3- Bis (t-butylperoxypropyl) benzene, di-t-butylperoxy-diisopropylbenzene, t-butylperoxybenzene, 2,4-dichlorobenzoyl peroxide, 1,1-dibutylperoxy-3 Any one selected from the group consisting of, 3,5-trimethylsiloxane, n-butyl-4,4-di-t-butylperoxyvalerate and combinations thereof can be used.

The vulcanizing agent is preferably included in an amount of 0.5 to 2.5 parts by weight based on 100 parts by weight of the raw material rubber, in that the raw material rubber is less sensitive to heat and chemically stable.

The vulcanization accelerator refers to an accelerator that promotes the rate of vulcanization or promotes delay in the initial vulcanization stage.

The vulcanization accelerators include sulfenamide, thiazole, thiuram, thiourea, guanidine, dithiocarbamic acid, aldehyde-amine, aldehyde-ammonia, imidazoline, xanthate and their Any one selected from the group consisting of a combination can be used.

Examples of the sulfenamide vulcanization accelerators include N-cyclohexyl-2-benzothiazylsulfenamide (CBS), N-tert-butyl-2-benzothiazylsulfenamide (TBBS), and N, N-dicyclohexyl. Any selected from the group consisting of -2-benzothiazylsulfenamide, N-oxydiethylene-2-benzothiazylsulfenamide, N, N-diisopropyl-2-benzothiazolesulfenamide and combinations thereof The sulfenamide type compound of can be used.

Examples of the thiazole vulcanization accelerators include 2-mercaptobenzothiazole (MBT), dibenzothiazyl disulfide (MBTS), sodium salt of 2-mercaptobenzothiazole and zinc salt of 2-mercaptobenzothiazole. , Copper salt of 2-mercaptobenzothiazole, cyclohexylamine salt of 2-mercaptobenzothiazole, 2- (2,4-dinitrophenyl) mercaptobenzothiazole, 2- (2,6-di Any thiazole compound selected from the group consisting of ethyl 4-morpholinothio) benzothiazole and combinations thereof can be used.

Examples of the thiuram-based vulcanization accelerators include tetramethyl thiuram disulfide (TMTD), tetraethyl thiuram disulfide, tetramethyl thiuram monosulfide, dipentamethylene thiuram disulfide, dipentamethylene thiuram monosulfide and dipentamethylene. Thiuram-based compounds selected from the group consisting of thiuram tetrasulfide, dipentamethylenethiuram hexasulfide, tetrabutylthiuram disulfide, pentamethylenethiuram tetrasulfide, and combinations thereof can be used.

As the thiourea vulcanization accelerator, for example, thiocarbamide, diethylthiourea, dibutylthiourea, trimethylthiourea, diorthotolylthiourea, and any combination thereof is selected from the group of thiourea Compounds can be used.

As the guanidine-based vulcanization accelerator, for example, any one guanidine-based compound selected from the group consisting of diphenylguanidine, diorthotolylguanidine, triphenylguanidine, orthotolylbiguanide, diphenylguanidine phthalate, and combinations thereof can be used. Can be.

Examples of the dithiocarbamic acid-based vulcanization accelerators include ethylphenyldithiocarbamate zinc, butylphenyldithiocarbamate zinc, sodium dimethyldithiocarbamate, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, Zinc dibutyldithiocarbamate, zinc diamyldithiocarbamate, zinc dipropyldithiocarbamate, zinc salt of pentamethylenedithiocarbamate and piperidine, hexadecylisopropyldithiocarbamate zinc, octadecyl Isopropyldithiocarbamate zinc dibenzyldithiocarbamate zinc, sodium diethyldithiocarbamate, pentamethylenedithiocarbamate piperidine, dimethyldithiocarbamate selenium, diethyldithiocarbamate tellurium, dia One dithiocarbamic acid compound selected from the group consisting of cadmium didicarbamate and combinations thereof can be used.

The aldehyde-amine-based or aldehyde-ammonia-based vulcanization accelerators include, for example, an aldehyde selected from the group consisting of acetaldehyde-aniline reactants, butylaldehyde-aniline condensates, hexamethylenetetramine, acetaldehyde-ammonia reactants, and combinations thereof. -Amine based or aldehyde-ammonia based compounds can be used.

As said imidazoline type vulcanization accelerator, imidazoline type compounds, such as 2-mercaptoimidazoline, can be used, for example, As said xanthate type vulcanization accelerator, xanthate type, such as zinc dibutyl xanthogenate Compounds can be used.

The vulcanization accelerator may be included in an amount of 0.5 to 4.0 parts by weight based on 100 parts by weight of the raw material rubber in order to maximize productivity and rubber properties by promoting the vulcanization rate.

The vulcanization accelerator is a compounding agent used in combination with the vulcanization accelerator to complete its promoting effect. Any one selected from the group consisting of inorganic vulcanization accelerators, organic vulcanization accelerators and combinations thereof can be used. .

As the inorganic vulcanization accelerating aid, any one selected from the group consisting of zinc oxide (ZnO), zinc carbonate, magnesium oxide (MgO), lead oxide, potassium hydroxide and combinations thereof may be used have. The organic vulcanization accelerator is selected from the group consisting of stearic acid, zinc stearate, palmitic acid, linoleic acid, oleic acid, lauric acid, dibutyl ammonium oleate, derivatives thereof, and combinations thereof. You can use either one.

In particular, the zinc oxide and the stearic acid may be used together as the vulcanization accelerator, in which case the zinc oxide is dissolved in the stearic acid to form an effective complex with the vulcanization accelerator, thereby releasing advantageous sulfur during the vulcanization reaction. It facilitates the crosslinking reaction of the rubber.

When using the zinc oxide and the stearic acid together may be used in 1 to 5 parts by weight and 0.5 to 3 parts by weight with respect to 100 parts by weight of the raw material rubber for the role as a suitable vulcanization accelerator.

The tire tread rubber composition may be excellent in workability and may not include a softener during rubber compounding, but may also include a softener that is commonly used in rubber for tires.

The softener may be added to the rubber composition to impart plasticity to the rubber to facilitate processing or to lower the hardness of the vulcanized rubber. The softener may be any one selected from the group consisting of process oil, vegetable oil, and combinations thereof, but the present invention is not limited thereto.

As the processing oil, any one selected from the group consisting of paraffin processing oil, naphthenic processing oil, aromatic processing oil, and combinations thereof may be used.

However, it is known that cancer is more likely to occur when the content of polycyclic aromatic hydrocarbons (hereinafter referred to as "PAHs") contained in the aromatic process oil is 3% by weight or more with the recent increase of environmental awareness. The processed oil used as the softener has a total content of PAHs component of 3% by weight or less, a kinematic viscosity of 95 ° C or more (210 ° F SUS), an aromatic component of 15-25% by weight, nap It is preferable to use 27-37 weight% of tenth component, and 38-58 weight% of paraffinic component.

The processing oil has excellent properties in terms of environmental factors such as the possibility of causing cancer of PAHs while improving the low temperature characteristics and fuel efficiency of the tire tread including the processing oil.

The plant oils include castor oil, cottonseed oil, linseed oil, canola oil, soybean oil, palm oil, palm oil, peanut oil, pine oil, pine tar, tall oil, corn oil, rice bran oil, safflower oil, sesame oil, olive oil, sunflower oil, palm kernel oil, camellia oil It may be used any one selected from the group consisting of jojoba oil, macadamia nut oil, saflower flower oil, tung oil and combinations thereof.

The softener is preferably used in an amount of 20 to 40 parts by weight based on 100 parts by weight of the raw material rubber, in terms of improving the processability of the raw material rubber.

The anti-aging agent is an additive used to stop the chain reaction in which the tire is automatically oxidized by oxygen. As the anti-aging agent, any one selected from the group consisting of amines, phenols, imidazoles, carbamic acid metal salts, and combinations thereof may be appropriately selected and used.

The anti-aging agent may be N- (1,3-dimethylbutyl) -N-phenyl-p-phenylenediamine (N- (1,3-Dimethybutyl) -N-phenyl-p-phenylenediamine, 6PPD), N-phenyl N-phenyl-n-isopropyl-p-phenylenediamine (3PPD), poly (2,2,4-trimethyl-1,2-dihydroquinoline (Poly (2,2) , 4-trimethyl-1,2-dihydroquinoline, RD) and a combination thereof can be preferably used.

The anti-aging agent has a high solubility in rubber in addition to the anti-aging action, is low in volatility, inert to rubber, and does not inhibit vulcanization. It may be included in parts by weight.

The tire tread rubber composition may be used for four seasons, but may be preferably used for summer. The rubber tread rubber composition enhances low fuel efficiency and at the same time maintains braking performance and steering performance, such as fuel economy, wet road braking, A summer tire tread rubber composition optimized for steering performance at high speeds has an advantageous effect.

A tire according to another embodiment of the present invention is manufactured using the rubber tread rubber composition. The method of manufacturing a tire using the tire tread rubber composition may be applied to any method conventionally used for the production of tires, and thus, detailed description thereof will be omitted.

The rubber composition for tire tread of the present invention maximizes low fuel efficiency by reducing hysteresis, and also has excellent braking performance that can be reduced due to maximization of low fuel efficiency, so that workability in unvulcanized state, braking performance in vulcanized state, wear performance and Both rotation resistance characteristics can be improved.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

[ Manufacturing example : tire For tread  Preparation of Rubber Composition]

( Example And Comparative example )

To prepare a tire tread rubber composition according to the following Examples and Comparative Examples using the composition shown in Table 1. The preparation of the tire tread rubber composition was in accordance with a conventional method for producing tire tread rubber.

Table 1

Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 E-SBR ⁽¹⁾ 80 - - - - S-SBR ⁽²⁾ - 60 - 80 80 S-SBR ⁽³⁾ - - 80 - - BR ⁽⁴⁾ 20 40 20 20 20 Silica ⁽⁵⁾ 80 80 80 80 - Silica ⁽⁶⁾ - - - - 80 Coupling Agents ⁽⁷⁾ 6.4 6.4 6.4 6.4 6.4 Zinc oxide 3 3 3 3 3 Stearic acid One One One One One brimstone 1.75 1.75 1.75 1.75 1.75 Accelerators ⁽⁸⁾ One One One One One Accelerators ⁽⁹⁾ 2 2 2 2 2

(Unit: weight part)

(1) E-SBR: SBR1502 with emulsion polymerization styrene butadiene rubber.

(2) S-SBR: prepared by a batch method in which the styrene content is 20 to 30% by weight and the vinyl content in the butadiene is 50 to 60% by weight, the terminal is modified with an alkoxy silane, and the molecules are Si-couple Ring solution polymerized styrene butadiene rubber (SBR).

(3) S-SBR: A solution-polymerized styrene butadiene rubber prepared by a batch method having a styrene content of 20 to 30% by weight and a vinyl content of butadiene containing 50 to 60% by weight, the terminal of which is modified with an alkoxy silane ( SBR).

(4) BR: butadiene rubber

(5) Silica: Precipitated silica having a nitrogen adsorption value of 170 m 2 / g and a CTAB value of 160 m 2 / g

(6) Silica: precipitated silica having a nitrogen adsorption value of 153 m 2 / g and a CTAB value of 154 m 2 / g

(7) Coupling Agent: Si69, Degussa

(8) Accelerator: CBS (N-cyclohexyl-2-benzothiazylsulfenamide)

(9) Accelerator: DPG (diphenylguanidine)

[ Experimental Example : Manufactured tire For tread  Measurement of rubber properties]

Physical properties were measured using the rubber for tire treads prepared in Comparative Examples 1 to 3 and Examples 1 and 2, and the results are shown in Table 2 below.

[Table 2]

Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 Mooney viscosity (125 ℃) 67 69 68 65 67 Hardness (shore A) 66 65 64 65 64 300% Modulus (Mpa) 12.6 13.2 12.4 15.0 12.0 Elongation (%) 385 402 314 356 364 Wear resistance (Index) 100 105 99 106 97 0 ℃ tan δ 0.304 0.284 0.299 0.342 0.354 60 ℃ tan δ 0.116 0.105 0.102 0.076 0.105

Mooney viscosity (ML1 + 4 (125 ° C.)) was measured according to ASTM standard D1646.

Hardness was measured according to DIN 53505

300% modulus and elongation were measured according to ISO 37 standard.

-Elongation rate refers to the elongation at break, which was measured by the method of expressing the strain value in% until the test piece was broken in the tensile tester.

Wear resistance is Lambbourn abrasion tester. It was shown by indexing based on the comparative example 1.

-Viscoelasticity was measured in tanδ from 60 ° to 80 ° C with 10% frequency at 0.1% strain using RDS meter.

Mooney viscosity in Table 2 is a value indicating the viscosity of the unvulcanized rubber, the lower the value indicates that the excellent workability of the unvulcanized rubber. The higher the value, the better the braking performance. The lower the value, the better the performance. Hardness represents adjustment stability, and the higher the value, the better the adjustment stability. 300% modulus and elongation indicate that the higher the value, the better the tensile properties, and the higher the wear resistance, the better the wear resistance.

Referring to Table 2, in the case of Comparative Example 2 using the S-SBR of the present invention outside the content range, the braking performance was lower than that of Examples 1 and 2, and in the case of Comparative Example 3 in Examples 1 and 2 The elongation rate and braking performance were lower than those of the present invention. The rubbers of Examples 1 and 2 are excellent in braking performance and relatively excellent in wear performance, rotational resistance characteristics while maintaining adjustment stability compared to Comparative Examples 1 to 3, which are conventional tread rubber compositions. Able to know.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (3)

70 to 90 parts by weight of solution-polymerized styrene butadiene rubber (S-SBR) and 20 to 30 parts by weight of butadiene rubber (BR) having a styrene content of 20 to 30% by weight and a vinyl content of 50 to 60% by weight of butadiene. 100 parts by weight of raw rubber, and Nitrogen adsorption specific surface area of 160 to 185 m 2 / g, CTAB (cetyltrimethyl ammonium bromide) comprises a 60 to 90 parts by weight of silica having a specific surface area of 160 to 170 m 2 / g, The solution polymerized styrene butadiene rubber is a terminal of the molecule is modified with alkoxy silane (Alkoxy Silane), the molecule is a tire tread rubber composition is coupled to each other by silicon (Si). delete A tire manufactured using the rubber composition for tire tread according to claim 1.