KR20130019044A - Rubber composition for tire tread and tire manufactured by using the same - Google Patents

Abstract

PURPOSE: A tire tread rubber composition is provided to improve handling, abrasion resistance, and control stability and to improve crack resistance and chip cut resistance. CONSTITUTION: A tire tread rubber composition comprises 100.0 parts by weight of raw rubber, 48-54 parts by weight of a carbon black. The carbon black has a specific surface area(statical thickness surface area) of 130-150 m^2/g, COAN(Oil Absorption Number of Compressed sample) is 110-130 cc/100g, and Dw(average of aggregate size distribution on the basis of weight) is 80 or less. The raw rubber comprises 30-50 parts by weight of a natural rubber, 20-40 parts by weight of a butadiene rubber, 20-30 parts by weight of a styrene-butadiene rubber.

Description

TECHNICAL FIELD [0001] The present invention relates to a rubber composition for a tire tread, and a tire manufactured using the same. BACKGROUND OF THE INVENTION [0002]

The present invention relates to a rubber tread rubber composition, and more particularly, to a rubber tread rubber composition that can improve crack resistance and chip cut performance while improving wear resistance and steering stability.

Since tires of trucks and buses are mainly intended for cargo and manpower transportation and drive on the highway for a long time, abrasion resistance and durability due to high speed and long driving are most importantly required, unlike general road vehicles.

However, with the recent increase in the number of high-performance and high-end vehicles, the demand for excellent braking, maneuvering stability, and ride comfort on trucks and buses is increasing. Therefore, there is a need for a tire composition capable of satisfying properties such as braking, steering stability, and ride comfort while maintaining tire durability and wear resistance.

In the case of tires used in trucks and buses, carbon black with a small particle size is used in consideration of abrasion resistance, and high molecular weight and high elasticity characteristics in consideration of crack resistance, chip cut performance, and tire durability against rough road conditions Natural rubber with excellent heat resistance.

The chip-cut refers to an abnormal wear phenomenon in which the tread portion of the tire is cut or dropped at the end of wear, which seriously affects not only tire life but also regeneration.

When the molecular weight distribution value of such natural rubber is wide, there is a problem in that heat generation, crack resistance and chip cut performance are deteriorated. When carbon black having a small particle size and excellent reinforcement performance is used, wear resistance may be improved. There is a disadvantage in that crack resistance and chip cut resistance are disadvantageous due to an increase in heat generated by friction.

In order to overcome the above problems, a technique of using a mixture of styrene-butadiene rubber has been considered. However, when the styrene-butadiene rubber is used in an excessive amount as compared to natural rubber, crack resistance may be lowered, and a chip cut phenomenon may occur from the beginning of driving.

Therefore, it is very difficult to manufacture rubber compositions for bus or truck tire treads that can satisfy both crack resistance and chip cut performance with durability while excluding the limited performance of carbon black and maintaining wear resistance. .

As a prior art, Patent Literature 1 (Application No. 10-2001-0073743) is a maleic hydride prepared by adding polybutadiene resin to 5 to 20 parts by weight of silica and maleic hydride with respect to 100 parts by weight of raw rubber. Rubber compositions comprising 1 to 5 parts by weight of polybutadiene rubber are described. However, in this case, there is a problem that wear resistance and durability are lowered due to a decrease in modulus when the coupling agent is not used when the silica is used or when the resin is excessively applied.

Patent Document 2 (Application No. 10-2006-0102671) is to use neodymium-butadiene rubber having high molecular weight and linearity of molecular chain mixed with natural rubber in order to prevent deterioration of abrasion resistance by using silica as a reinforcing agent. . Dispersion is disadvantageous due to the polar nature of silica.

Therefore, there is a need for technology development for a tire tread rubber composition which can improve crack resistance and chip cut performance while improving wear resistance and steering stability.

KR Application No. 10-2001-0073743, published June 02, 2003. KR Application No. 10-2006-0102671, published October 4, 2007

SUMMARY OF THE INVENTION An object of the present invention is to provide a rubber tread rubber composition having improved tire chip cut performance, and more particularly, a truck or bus that can improve crack resistance and chip cut performance while improving handling, abrasion resistance, and steering stability. It is to provide a rubber composition for tire tread.

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

In order to achieve the above object, the rubber composition for a tire tread according to an embodiment of the present invention is 100 parts by weight of raw material rubber, STSA Specific Thickness Surface Area (130) of 150 to 150m ² / g, COAN (Oil Absorption Number of The compressed sample may include 110 to 130 cc / 100 g and 48 to 54 parts by weight of a high reinforcing carbon black having an average of Aggregate Size Distribution on the basis of weight (Dw) of 80 or less.

The raw material rubber may include 30 to 50 parts by weight of natural rubber, 20 to 40 parts by weight of butadiene rubber, and 20 to 30 parts by weight of styrene-butadiene rubber.

In addition, the natural rubber has a Mooney viscosity of 65 to 85, the butadiene rubber has a cis content of 95 to 97% by weight, a glass transition temperature of less than -100 ℃, the styrene-butadiene rubber has a glass transition temperature Or less than -60 ° C.

2 to 5 parts by weight of the rubber composition for tire tread any one selected from the group consisting of TDAE (treated distillate aromatic extract) oil, MES (mild extraction solvate) oil, TRAE (treated residual aromatic extract) oil and combinations thereof It may be to include.

Tire tread according to another embodiment of the present invention is prepared by using the rubber composition for the tire tread.

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

The raw material rubber may be any one selected from the group consisting of natural rubber, synthetic rubber, and combinations thereof.

The natural rubber may be a general natural rubber or a modified natural rubber. The above-mentioned general natural rubber may be used as long as it is known as natural rubber, and the country of origin and the like are not limited. The natural rubber contains cis-1,4-polyisoprene as a main agent, but may also include trans-1,4-polyisoprene depending on the required properties. Therefore, in addition to natural rubber containing cis-1,4-polyisoprene as a main component, natural rubber including trans-1,4-isoprene as a main component, such as balata, Rubber may also be included.

The modified natural rubber means that the general natural rubber is modified or purified. For example, examples of the modified natural rubber include epoxidized natural rubber (ENR), deproteinized natural rubber (DPNR), and hydrogenated natural rubber.

Synthetic rubber is styrene-butadiene rubber (SBR), modified styrene-butadiene rubber, butadiene rubber (BR), modified butadiene rubber, chloro sulfonated polyethylene rubber, epichlorohydrin rubber, fluorine rubber, silicone rubber, nitrile rubber, Hydrogenated Nitrile Rubber, Nitrile Butadiene Rubber (NBR), Modified Nitrile Butadiene Rubber, Chlorinated Polyethylene Rubber, Styrene Ethylene Butylene Styrene (SEBS) Rubber, Ethylene Propylene Rubber, Ethylene Propylene Diene (EPDM) Rubber, Hypalon Rubber, Chloroprene Rubber, ethylene vinyl acetate rubber, acrylic rubber, hydrin rubber, vinyl benzyl chloride styrene-butadiene rubber, bromomethyl styrene butyl rubber, maleic acid styrene-butadiene rubber, carboxylic acid styrene-butadiene rubber, epoxy isoprene rubber, maleic acid ethylene propylene Rubber, Carboxylic Acid Nitrile Butadiene High It may be a p-methyl styrene (brominated polyisobutyl isoprene-co-paramethyl styrene, BIMS), and one selected from the group consisting of -, bromo mineyi suited polyisobutyl isoprene-co.

In particular, the raw material rubber is polyisoprene rubber, polybutadiene rubber, conjugated diene aromatic vinyl copolymer, nitrile conjugated diene copolymer, hydrogenated nitrile butadiene rubber (NBR), hydrogenated styrene-butadiene rubber (SBR), olefin rubber, maleic acid It may be any one selected from the group consisting of ethylene-propylene rubber, butyl rubber, copolymers of isobutylene and aromatic vinyl or diene monomer, acrylic rubber, ionomer, halogenated rubber, and chloroprene rubber.

Preferably, the raw material rubber may be any one selected from the group consisting of natural rubber, butadiene rubber, styrene-butadiene rubber, and combinations thereof, and more preferably, the raw material rubber is 30 to 50 parts by weight of natural rubber, butadiene 20 to 40 parts by weight of rubber and 20 to 30 parts by weight of styrene-butadiene rubber.

If the natural rubber is used in less than 30 parts by weight, even if the carbon black reinforcement is increased, it is difficult to improve crack resistance and chip cut performance, and when it is used in excess of 50 parts by weight, wear resistance and steering stability are inferior. . In addition, when the butadiene rubber is less than 20 parts by weight, reinforcement is lowered, and when used in excess of 40 parts by weight, there is a problem that wear resistance and steering stability are lowered. In addition, when the styrene-butadiene rubber is used in less than 20 parts by weight, the steering stability, such as rotational resistance and braking resistance is lowered, and when it exceeds 30 parts by weight, abrasion resistance may be reduced.

The natural rubber has a Mooney viscosity of 65 to 85, the butadiene rubber has a cis-1,4 content of 95 to 97% by weight, a glass transition temperature of -100 ° C. or less, and the styrene-butadiene rubber has a glass transition. It is preferable that temperature is -60 degreeC or less.

This is because when the Mooney viscosity of the natural rubber is less than 65, extrusion workability is lowered, and when it exceeds 85, it is difficult to mix the butadiene rubber and the styrene-butadiene rubber with the Mooney viscosity deviation. In addition, wear resistance decreases when the glass transition temperature of butadiene rubber exceeds -100 ° C, and wear resistance decreases when the glass transition temperature of styrene-butadiene rubber exceeds -60 ° C.

Meanwhile, the STSA Specific Thickness Surface Area (130) is 150 to 150 m ² / g, COA (Oil Absorption Number of Compressed Sample) is 110 to 130cc / 100g and Dw (Average of Aggregate Size) based on 100 parts by weight of the raw material rubber. Highly reinforcing carbon black having a distribution on the basis of weight) of 80 or less may be included in an amount of 48 to 54 parts by weight.

This is because when the high reinforcing carbon black is less than 48 parts by weight, the reinforcing effect is lowered, and when it exceeds 54 parts by weight, it may be difficult to improve crack resistance and chip cut performance.

STSA Specific Thickness Surface Area is in accordance with ASTM D6556-10 for the particle surface area using statistical methods. When the STSA is less than 130m ² / g, the crack resistance and chip cut performance improvement effect is inferior, and when it is more than 150m ² / g may be less durable.

Oil Absorption Number of Compressed Sample (COAN) is a standard according to ASTM D3493-09 that provides a standard value based on the oil absorption. When the COAN is less than 110cc / 100g, durability and dispersibility are lowered, and when it exceeds 130cc / 100g, the elongation rate is reduced, which may lower the crack resistance.

Average of Aggregate Size Distribution on the basis of weight (Dw) refers to the weight average aggregate size distribution. Specifically, a uniform carbon black-containing solution is injected into a rotating disk to settle into a fixed distance ride beam while centrifuging. It is to measure the size by detecting the aggregation. Since large settlings settle quickly and small settlings settle slowly, this principle is used to measure the size and distribution of flocculations. Plotting the fraction by coagulation size shows the normal distribution (disc spec .: Disc Centrifuge Photosedimentometer (BI-DCP)). When the Dw is 80 or less, the particle size of the carbon black may be reduced, so that the chip cut resistance may be improved, and when it exceeds 80, the chip cut resistance may be reduced.

Meanwhile, the rubber composition for a tire tread according to an embodiment of the present invention may further include various additives such as additional vulcanizing agents, vulcanization accelerators, vulcanization accelerators, anti-aging agents or 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.

The additional vulcanizing agent may be a metal oxide such as sulfur-based vulcanizing agent, organic peroxide, resin vulcanizing agent, magnesium oxide.

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 may be adjusted in a range that chemically stabilizes the appropriate vulcanizing effect and the raw material rubber, and preferably may be used in the range of 1.8 to 2.2 parts by weight while considering the degree of crosslinking.

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. Any thiuram-based compound selected from the group consisting of thiuram tetrasulfide, dipentamethylene thiuram hexasulfide, tetrabutyl thiuram disulfide, pentamethylene thiuram 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 accelerator, for example, acetaldehyde-aniline reactant, butylaldehyde-aniline condensate, hexamethylenetetramine, acetaldehyde-ammonia reactant 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 5.0 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. .

The inorganic vulcanization accelerator may be any one selected from the group consisting of zinc oxide (ZnO), zinc carbonate, magnesium oxide (MgO), lead oxide, potassium hydroxide, and combinations thereof. . 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 accelerating assistant. In this case, the zinc oxide is dissolved in the stearic acid to form an effective complex with the vulcanization accelerator, Thereby facilitating the crosslinking reaction of the rubber.

When the zinc oxide and the stearic acid are used together, they may be used in an amount of 1 to 5 parts by weight and 0.5 to 3 parts by weight, respectively, based on 100 parts by weight of the raw rubber to serve as a proper vulcanization accelerator.

The softener is added to the rubber composition to impart plasticity to the rubber to facilitate processing or to lower the hardness of the vulcanized rubber, and refers to oils and other materials used in rubber compounding or rubber production.

The softener may be any one selected from the group consisting of petroleum oil, vegetable oil and combinations thereof, but the present invention is not limited thereto.

The petroleum oil may be any one selected from the group consisting of paraffinic oil, naphthenic oil, aromatic oil, and combinations thereof.

Representative examples of the paraffinic oil include P-1, P-2, P-3, P-4, P-5, and P-6 of Michang Oil, Inc. A representative example of the naphthenic oil is Michang oil. N-1, N-2, N-3, etc. of the corporation | Co., Ltd. are mentioned, As a representative example of the said aromatic oil, A-2, A-3, etc. of Michang Oil Corporation are mentioned.

However, with the recent increase in environmental awareness, when the content of the polycyclic aromatic hydrocarbons (Polycyclic Aromatic Hydrocarbons (hereinafter referred to as "PAHs") contained in the aromatic oil is more than 3% by weight, it is known that cancer is likely to cause, Treated distillate aromatic extract (TDAE) oil, mild extraction solvate (MES) oil, residual aromatic extract (RAE) oil, treated residual aromatic extract (TRAE) oil or heavy naphthenic oil can be preferably used.

In particular, the oil used as the softener has a total content of PAHs component of 3% by weight or less, a kinematic viscosity of 30 to 180 (210 ° F. SUS), an aromatic component of the softener of 15 to 25% by weight, and naphthene. TDAE oils with 27 to 37% by weight and 38 to 58% by weight of paraffinic components can be preferably used.

The TDAE oil has an advantageous property against environmental factors such as the cancer fatigue of PAHs while improving fatigue resistance and life characteristics of the tire including the TDAE 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 0 to 150 parts by weight based on 100 parts by weight of the raw material rubber in terms of improving processability of the raw material rubber, and more preferably 2 to 5 parts by weight of the oil. This is because, when used in less than 2 parts by weight, it is difficult to obtain an effect of improving the dispersibility of the highly reinforcing carbon black, and in the case of more than 5 parts by weight, durability may be reduced.

Preferably, the TDAE has a PAHs content of 3 wt% or less, a kinematic viscosity of 40 to 150 (210 ° F. SUS), and an aromatic content among hydrocarbons contained in the oil, that is, a hydrocarbon aromatic composition (Ca) of 10 wt% or more. Oil, MES oil and TRAE oil can be used. When the polycyclic aromatic hydrocarbon exceeds 3% by weight, it may adversely affect the worker's health and the work environment due to the possibility of cancer, and the kinematic viscosity range considers the optimum viscosity considering the field workability. In addition, when the composition of the carbon aromatic is less than 10% by weight, such as durability may be a problem due to affinity with the 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 amine-based, phenol-based, quinoline-based, imidazole-based, carbamic acid metal salts, waxes, and combinations thereof may be appropriately selected.

Examples of the amine type antioxidant include N-phenyl-N '- (1,3-dimethyl) -p-phenylenediamine, N- (1,3-dimethylbutyl) -N'- Phenyl-N'-isopropyl-p-phenylenediamine, N, N'-diphenyl-p-phenylenediamine, -Cyclohexyl p-phenylenediamine, N-phenyl-N'-octyl-p-phenylenediamine, and combinations thereof.

Examples of the phenolic antioxidant include phenol-based 2,2'-methylene-bis (4-methyl-6-tert-butylphenol), 2,2'- isobutylidene- Di-t-butyl-p-cresol, and combinations thereof.

As the quinoline antioxidant, 2,2,4-trimethyl-1,2-dihydroquinoline and its derivatives can be used. Specifically, 6-ethoxy-2,2,4-trimethyl- Dihydroquinoline, 6-anilino-2,2,4-trimethyl-1,2-dihydroquinoline, 6-dodecyl-2,2,4-trimethyl-1,2-dihydroquinoline and combinations thereof Any one selected from the group can be used.

As the wax, a wax generally used as an anti-aging agent for rubber may be used, and waxy hydrocarbon may be preferably used.

As the anti-aging agent, preferably, N- (1,3-dimethylbutyl) -N-phenyl-p-phenylenediamine (N- (1,3-Dimethybutyl) -N-phenylp-phenylenediamine, 6PPD), N- 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 combinations thereof may be 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 rubber composition for the tire tread is not limited to the tread (tread cap and tread base), and may be included in various rubber components constituting the tire. Such rubber components include sidewalls, sidewall inserts, apex, chafers, wire coats or innerliners, and the like.

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 tire may be a passenger car tire, an airplane tire, an agricultural machine tire, an off-the-road tire, or the like. Preferably, it can be used as a tire for trucks or buses.

The rubber composition for tire treads according to the present invention can improve crack resistance and chip cut performance while improving handling, abrasion resistance and steering stability. In particular, since the wear resistance, adjustment stability, crack resistance, and chip cut resistance are improved, the tire tread rubber composition or a tire manufactured using the tire tread may be more suitably used for driving characteristics such as a bus or a truck.

Hereinafter, the present invention will be described in detail so that those skilled in the art can easily implement 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.

Preparation Example: Preparation of Rubber Composition

A rubber composition for tire treads according to the following examples and comparative examples was prepared using the composition shown in Table 1 below. The rubber composition was prepared according to a conventional method for preparing a rubber composition.

Example 1 STSA = 130 ~ 150m ² / g, COAN = 110 ~ 130cc / 100g, Dw ≤ 100 parts by weight of the raw material rubber consisting of 25 parts by weight of butadiene rubber, 45 parts by weight of natural rubber, 30 parts by weight of styrene-butadiene rubber It was prepared to include 50 parts by weight of high reinforcement carbon black of 80nm. Comparative Example 1 used carbon black having STSA = 160 ~ 180m ² / g, COAN = 135 ~ 150cc / 100g, Dw> 80nm, and Comparative Examples 2 to 3 were natural rubber, butadiene rubber and styrene-butadiene rubber in the raw material rubber. It was prepared by varying each content of.

Example 2 was the same as in Example 1 except that no oil was added.

Item Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Natural rubber 45 45 45 100 45 Synthetic Rubber A (1) 25 25 25 - 55 Synthetic Rubber B (2) 30 30 30 - - Carbon Black A (3) 50 50 - 50 50 Carbon Black B (4) - - 50 - - Oil (5) 4 - 4 4 4 Zinc oxide 4.0 4.0 4.0 4.0 4.0 Stearic acid 1.5 1.5 1.5 1.5 1.5 brimstone 2.0 2.0 2.0 2.0 2.0 accelerant 0.9 0.9 0.9 0.9 0.9

(Unit: parts by weight)

(1) Synthetic rubber A: Butadiene rubber having a Cis-1,4 content in the range of 95 to 96.9 wt% and a glass transition temperature of -100 ° C or less.

(2) Synthetic rubber B: Styrene-butadiene rubber containing no oil and having a glass transition temperature of -60 deg.

(3) Carbon black A: STSA = 130-150 m ² / g, COAN = 110-130 cc / 100 g, Dw ≦ 80 nm.

(4) Carbon Black B: STSA = 160-180m ² / g, COAN = 135-150cc / 100g, Dw> 80nm.

(5) Oil: PAHs content up to 3% by weight, kinematic viscosity 80-100 SUS (210 ° F., TDAE oil with carbon aromatic composition 20-25% by weight).

Experimental Example: Measurement of physical properties of Examples and Comparative Examples

The durability, chip cut resistance, crack resistance, abrasion resistance, braking resistance, and steering stability of Examples 1 to 2 and Comparative Examples 1 to 3 were measured and shown in Table 2 below. This is based on Example 1 100, and was described by comparing Example 2 and Comparative Examples 1 to 3.

Item Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Durability Index (1) 100 105 105 100 100 Chip cut resistance index (2) 100 90 90 100 100 Crack Resistance Index (3) 100 90 90 100 100 Abrasion Resistance Index (4) 100 90 90 85 105 Braking Performance Index (5) 100 100 100 90 90 Steering Stability Index (6) 100 100 100 90 90

(1) Durability index: The running time until the tire was destroyed by running the tire at a constant load and a constant speed was measured.

(2) Chip cut resistance index: The difference in the weight difference between the test piece and the test piece was measured by applying a sharp blade to the rotating rubber specimen at a constant cycle and a constant force.

(3) Crack resistance index: The specimen was deformed at regular intervals and the crack growth length was measured after a certain cycle.

(4) Abrasion resistance index: A specimen of a certain size was run by rubbing at a constant speed, such as abraded stone, and the difference in weight before and after running was measured.

(5) Braking performance index: The braking distance was measured during a sudden stop while driving a vehicle equipped with tires at a constant speed.

(6) Steering stability index: A vehicle with a tire was driven at a constant speed to measure the degree of vehicle shake during lane change.

Referring to Table 2, Example 1 has a comparable or superior effect in each item for durability, chip cut resistance, crack resistance, wear resistance, braking resistance, steering stability compared to Comparative Examples 1 to 3. Specifically, Example 1 has improved chip wear resistance, crack resistance, abrasion resistance, and abrasion resistance, braking performance, steering stability, and abrasion resistance, braking performance, and steering stability compared to Comparative Example 3, compared to Comparative Example 1. Effect.

In addition, Example 1 was confirmed to exhibit improved physical properties in chip cut resistance, crack resistance and abrasion resistance compared to Example 2 due to the improved dispersibility of carbon black with the addition of oil.

Therefore, in Example 1, it was confirmed that durability, chip cut resistance, crack resistance, abrasion resistance, braking resistance, and steering stability were improved evenly without degrading a certain portion of each item.

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 (5)

100 parts by weight of raw rubber, and
Gobos with STSA Specific Thickness Surface Area of 130 to 150 m ² / g, Oil Absorption Number of Compressed Sample (COAN) 110 to 130 cc / 100 g, and Average of Aggregate Size Distribution on the basis of weight (Dw) of 80 or less 48 to 54 parts by weight of rigid carbon black
A rubber composition for tire treads to contain. The method of claim 1,
The raw material rubber is a rubber composition for tire treads comprising 30 to 50 parts by weight of natural rubber, 20 to 40 parts by weight of butadiene rubber and 20 to 30 parts by weight of styrene-butadiene rubber. The method of claim 1,
The natural rubber has a Mooney viscosity of 65 to 85,
The butadiene rubber has a cis-1,4 content of 95 to 97% by weight, a glass transition temperature of -100 ° C. or less,
The styrene-butadiene rubber is a glass transition temperature of less than -60 ℃
Rubber composition for tire tread The method of claim 1,
For tire tread comprising any one selected from the group consisting of TDAE (treated distillate aromatic extract) oil, MES (mild extraction solvate) oil, TRAE (treated residual aromatic extract) oil and combinations thereof. Rubber composition. A tire manufactured using the rubber composition for tire tread according to claim 1.