KR20140126489A - Rubber composition for tire tread and tire manufactured by using the same - Google Patents

Abstract

The present invention relates to a rubber composition for tire treads and to a tire manufactured by using the rubber composition. The rubber composition for tire treads comprises 100 parts by weight of source rubber and 1.0-25.0 parts by weight of metallic oxide coated with a tannin-based adhesive and cobalt-boron. The rubber composition for tire treads has enhanced dispersibility of additives in a mixing process, excellent initial grip performance and grip persistence during a drive, and enhanced wear resistance.

Description

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

The present invention relates to a rubber composition for a tire tread and a tire produced using the same, and more particularly, to a rubber composition for a tire tread having improved dispersibility of an additive at the time of compounding, excellent initial grip performance during running and grip sustainability, And a tire manufactured using the same.

In recent years, due to the high performance of passenger cars, consumers are demanding high performance of tires. In particular, the demand for tires having both abrasion resistance, handling and ride performance, wet braking performance and low fuel consumption, Application of material is being actively examined.

In addition, tire technology that combines abrasion resistance, braking performance, handling and ride performance and low fuel consumption of such tires has been developed particularly in the field of materials.

In addition, the processability of the compound deteriorates in the process of improving the performance. In order to mass-produce the compound, it is necessary to improve the processability of the compound.

In general, reducing the amount of reinforcing filler by reducing the rolling resistance, which is related to the fuel efficiency of the tire, reduces the interaction between the reinforcing agent and the reinforcing agent, thereby reducing the hysteresis loss and reducing the rolling resistance.

However, this technique is disadvantageous in that it reduces braking performance and adjustment stability performance on wet road surface, which is an important characteristic of tire tread, as the amount of reinforcing filler is reduced.

As described above, improvement of the fuel efficiency of the tire in the current tire material development technology generally causes a decrease in the braking performance on the wet road surface, and when the braking performance is improved on the wet road surface of the tire, A case occurs.

In this way, each performance of the tire shows a phenomenon that when one performance is improved, the other performance is lowered. Therefore, a technology capable of improving one performance while minimizing another performance degradation or improving both performance at the same time Development of compound processing technology for mass production and technology for improving processability of compound itself are required.

On the other hand, a technique of using a metal oxide such as magnesium oxide to improve grip performance of a tire tread has been known. However, when a small amount of the magnesium oxide alone is used, it is difficult to secure physical properties, and when the magnesium oxide is used in a large amount, it is very disadvantageous in dispersion during mixing. In particular, when other metal oxides other than the above-mentioned magnesium oxide are used, they may act as a foreign substance to deteriorate the physical properties of the tread.

Korean Patent Publication No. 2011-0071607 (Publication date: June 29, 2011) Korean Patent Publication No. 2011-0073061 (Publication date: June 29, 2011)

An object of the present invention is to provide a rubber composition for a tire tread having improved dispersibility of an additive at the time of mixing of the horn, excellent initial grip performance at the time of running and grip continuity, and improved abrasion resistance.

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

In order to achieve the above object, a rubber composition for a tire tread according to an embodiment of the present invention comprises 100 parts by weight of a raw rubber, a tannin-based adhesive, and a metal coated with cobalt-boron 1.0 to 25.0 parts by weight of an oxide.

The metal oxide may be a short fiber which is cut to a length of 0.1 to 10 mm.

The metal oxide may be an oxide of any one metal selected from the group consisting of iron, magnesium, nickel, copper and tungsten.

The coated metal oxide may include 5 to 20 parts by weight of the tannin-based adhesive and 5 to 20 parts by weight of the cobalt-boron based on 100 parts by weight of the metal oxide.

A tire according to another embodiment of the present invention is manufactured using the rubber composition for a tire tread.

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

The rubber composition for tire tread according to one embodiment of the present invention includes 100 parts by weight of raw rubber and 1.0 to 25.0 parts by weight of tannin-based adhesives and metal oxides coated with cobalt-boron do.

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 includes cis-1,4-polyisoprene as a main component, but may also include trans-1,4-polyisoprene depending on required characteristics. 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. Examples of the modified natural rubber include epoxidized natural rubber (ENR), deproteinized natural rubber (DPNR), hydrogenated natural rubber and the like.

The synthetic rubber may be at least one selected from the group consisting of styrene butadiene rubber (SBR), modified styrene butadiene rubber, butadiene rubber (BR), modified butadiene rubber, chlorosulfonated polyethylene rubber, epichlorohydrin rubber, fluorine rubber, silicone rubber, Butadiene rubber, 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, Ethylene vinyl acetate rubber, acrylic rubber, hydrin rubber, vinyl benzyl chloride styrene butadiene rubber, bromomethyl styrene butyl rubber, maleic styrene butadiene rubber, carboxylic styrene butadiene rubber, epoxy isoprene rubber, ethylene propylene rubber maleic acid, Nitrile butadiene rubber 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.

Since the rubber composition for a tire tread contains the metal oxide, the initial grip performance at the time of running is improved due to an increase in the thermal history in the rubber, the rubber tread composition has excellent durability, and at the same time, the abrasion resistance is improved. Further, the metal oxide is coated with the tannin-based adhesive and the cobalt-boron to improve the dispersibility of the metal oxide in the rubber composition.

When the content of the coated metal oxide is less than 1.0 based on 100 parts by weight of the raw material rubber, it may be difficult to exhibit the target performance of the present invention. When the amount exceeds 25.0 parts by weight, the coating metal oxide is repeatedly added It can be a starting point of cracking during exercise.

The metal oxide may be an oxide of any one metal selected from the group consisting of iron, magnesium, copper, nickel, and tungsten. Preferably, when an oxide of iron or an oxide of magnesium is used, Can be improved.

In addition, the metal oxide may be a short fiber which is cut to a length of 0.1 to 10 mm. When the metal oxide has a short fiber shape, the grip performance and durability of the tire can be further improved. If the length of the metal oxide is less than 0.1 mm, the target performance of the present invention may be difficult to manifest, and if it is more than 10 mm, cracks may occur during repetitive motion in the rubber.

Specifically, the metal oxide may be used by cutting a surface-dipped steel wire, which is conventionally added to a compound for belt topping, to a length of 0.1 to 10 mm. The steel wire may be made of iron oxide.

The tannin-based adhesive is an eco-friendly wood resin adhesive containing tannin extracted from wood bark, and is widely used as an adhesive for woody composite materials. The tannin contained in the tannin-based adhesive is a condensed tannin, and a double-pine tannin having a high viscosity can be used.

When the metal oxide is coated with only the cobalt-boron, there is a problem that the adhesion is poor and the dispersibility is deteriorated. The problem can be solved by coating with the tannin-based adhesive.

The coated metal oxide may be coated with 5 to 20 parts by weight of the tannin-based adhesive and 5 to 20 parts by weight of the cobalt-boron based on 100 parts by weight of the metal oxide. If the content of the tannin-based adhesive is less than 5 parts by weight based on 100 parts by weight of the metal oxide, mutual aggregation may occur. If the content of the tannin-based adhesive exceeds 20 parts by weight, dispersion may be difficult. If the content of cobalt-boron is less than 5 parts by weight based on 100 parts by weight of the metal oxide, mutual coagulation may occur. If the content of cobalt-boron exceeds 20 parts by weight, dispersion may be difficult.

The method of coating the tannin-based adhesive and the cobalt-boron on the surface of the metal oxide is not particularly limited in the present invention, but a dipping method can be easily applied.

The rubber composition for a tire tread may further include various additives such as additional vulcanizing agents, vulcanization accelerators, vulcanization accelerators, fillers, coupling agents, anti-aging agents, softening agents or pressure-sensitive adhesives. The various additives can be used as long as they are commonly used in the field to which the present invention belongs. The content thereof is not particularly limited as long as it depends on a compounding ratio used in a rubber composition for a tire tread.

As the vulcanizing agent, a sulfur vulcanizing agent can be preferably used. The sulfur vulcanizing agent is an inorganic vulcanizing agent such as powder sulfur (S), insoluble sulfur (S), precipitated sulfur (S), colloid sulfur, etc., tetramethylthiuram disulfide (TMTD) Organic vulcanizing agents such as tetraethyltriuram disulfide (TETD) and dithiodimorpholine can be used. As the sulfur vulcanizing agent, a vulcanizing agent which produces elemental sulfur or sulfur, for example, amine disulfide, polymer sulfur and the like can be used.

It is preferable that the vulcanizing agent is contained in an amount of 0.5 to 4.0 parts by weight based on 100 parts by weight of the raw material rubber in view of providing a vulcanization effect that is less sensitive to heat and chemically stable.

The vulcanization accelerator refers to an accelerator that promotes the vulcanization rate or accelerates the retardation in the initial vulcanization step.

Examples of the vulcanization accelerator include sulfenamide, thiazole, thiuram, thiourea, guanidine, dithiocarbamate, aldehyde-amine, aldehyde-ammonia, imidazoline, Or a combination thereof.

Examples of the sulfenamide type vulcanization accelerator include N-cyclohexyl-2-benzothiazyl sulfenamide (CBS), N-tert-butyl-2-benzothiazyl sulfenamide (TBBS), N, N-dicyclohexyl -2-benzothiazyl sulfenamide, N-oxydiethylene-2-benzothiazyl sulfenamide, N, N-diisopropyl-2-benzothiazole sulfenamide, and combinations thereof Based compound can be used.

Examples of the thiol-based vulcanization accelerator include 2-mercaptobenzothiazole (MBT), dibenzothiazyl disulfide (MBTS), sodium salt of 2-mercaptobenzothiazole, zinc salt of 2-mercaptobenzothiazole , A copper salt of 2-mercaptobenzothiazole, a cyclohexylamine salt of 2-mercaptobenzothiazole, 2- (2,4-dinitrophenyl) mercaptobenzothiazole, 2- Ethyl 4-morpholinothio) benzothiazole, and combinations thereof. The thiazole-based compound may be used alone or in combination of two or more thereof.

Examples of the thiuram-based vulcanization accelerator include tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide, tetramethylthiuram monosulfide, dipentamethylthiuram disulfide, dipentamethylthiuram monosulfide, dipentamethylene Any one of thiuram-based compounds selected from the group consisting of thiuram tetrasulfide, dipentamethylenethiuram hexasulfide, tetrabutylthiuram disulfide, pentamethylenethiuram tetrasulfide, and combinations thereof can be used.

Examples of the thiourea vulcanization accelerator include thiourea compounds selected from the group consisting of thiacarbamide, diethyl thiourea, dibutyl thiourea, trimethyl thiourea, diorthotolyl thiourea, and combinations thereof. Compounds may be used.

Examples of the guanidine-based vulcanization accelerator include guanidine-based compounds selected from the group consisting of diphenyl guanidine, diorthotolyl guanidine, triphenyl guanidine, orthotolyl biguanide, diphenyl guanidine phthalate, and combinations thereof .

Examples of the dithiocarbamate-based vulcanization accelerator include zinc ethylphenyldithiocarbamate, zinc butylphenyldithiocarbamate, sodium dimethyldithiocarbamate, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, Zinc dibutyldithiocarbamate, zinc diamidithiocarbamate, zinc dipropyldithiocarbamate, complexation of zinc with piperidinedithiocarbamate and piperidine, zinc hexadecylisopropyldithiocarbamate, octadecyl Isopropyl dithiocarbamic acid zinc zinc dibenzyldithiocarbamate, sodium diethyldithiocarbamate, penta methylenedithiocarbamate, sodium selenium dimethyldithiocarbamate, diethyldithiocarbamate, sodium diethyldithiocarbamate, Cadmium dithiocarbamate, and combinations thereof. The dithiocarbamic acid-based compound may be used alone or in combination of two or more thereof.

Examples of the aldehyde-amine type or aldehyde-ammonia type vulcanization accelerator include aldehyde selected from the group consisting of acetaldehyde-aniline reactant, butylaldehyde-aniline condensate, hexamethylenetetramine, acetaldehyde-ammonia reactant, -Amine-based or aldehyde-ammonia-based compounds may be used.

As the imidazoline-based vulcanization accelerator, for example, an imidazoline-based compound such as 2-mercaptoimidazoline can be used. Examples of the xanthate vulcanization accelerator include xanthates such as zinc dibutylxanthogenate Compounds may 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 improvement and rubber property enhancement through vulcanization speed promotion.

The vulcanization accelerating assistant may be any one selected from the group consisting of an inorganic vulcanization accelerator aid, an organic vulcanization accelerator aid, and a combination thereof, which is used in combination with the vulcanization accelerator to complete the promoting effect thereof .

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. As the organic vulcanization accelerating auxiliary, there may be selected from the group consisting of stearic acid, zinc stearate, palmitic acid, linoleic acid, oleic acid, lauric acid, dibutyl ammonium oleate, derivatives thereof, Can be used.

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. If the content of the zinc oxide and the stearic acid is less than the above range, the vulcanization rate may be slow and the productivity may be deteriorated. If the content exceeds the above range, the scorch phenomenon may occur and the physical properties may be deteriorated.

The rubber composition for a tire tread may further include a filler. The filler may be any one selected from the group consisting of carbon black, silica, calcium carbonate, clay (hydrated aluminum silicate), aluminum hydroxide, lignin, silicate, talc, and combinations thereof.

The carbon black may have a nitrogen surface area per gram (N ₂ SA) of 30 to 300 m ² / g and an oil absorption amount of DBP (n-dibutyl phthalate) of 60 to 180 cc / 100 g, But is not limited thereto.

If the nitrogen adsorption specific surface area of the carbon black exceeds 300 m ² / g, the workability of the rubber composition for a tire may be deteriorated. If it is less than 30 m ² / g, the reinforcing performance by carbon black as a filler may be deteriorated. If the DBP oil absorption of the carbon black exceeds 180 cc / 100 g, the workability of the rubber composition may be deteriorated. If it is less than 60 cc / 100 g, the reinforcing performance by carbon black as a filler may be deteriorated.

Examples of the carbon black include N110, N121, N134, N220, N231, N234, N242, N293, N299, S315, N326, N330, N332, N339, N343, N347, N351, N358, N375, N539, , N630, N642, N650, N683, N754, N762, N765, N774, N787, N907, N908, N990 or N991.

The carbon black may be contained in an amount of 30 to 80 parts by weight based on 100 parts by weight of the raw rubber, more preferably 45 to 65 parts by weight, and still more preferably 53 to 57 parts by weight. When the content of the carbon black is less than 30 parts by weight, the reinforcing performance by the carbon black as the filler may be deteriorated. If the content is more than 80 parts by weight, the workability of the rubber composition may be deteriorated.

The silica may have a nitrogen surface area per gram (N ₂ SA) of 100 to 180 m ₂ / g and a cetyl trimethyl ammonium bromide (CTAB) adsorption specific surface area of 110 to 170 m 2 / g. But is not limited thereto.

If the nitrogen adsorption specific surface area of the silica is less than 100 m < 2 > / g, the reinforcing performance by the silica as the filler may be deteriorated. If it exceeds 180 m2 / g, the workability of the rubber composition may be deteriorated. If the CTAB adsorption specific surface area of the silica is less than 110 m < 2 > / g, the reinforcing performance by silica as a filler may be deteriorated.

Ultrasil VN2 (manufactured by Degussa AG), Ultrasil VN3 (manufactured by Degussa AG), Z1165MP (manufactured by Rhodia) or Z165GR (manufactured by Rhodia) can be used as the commercially available products. .

The silica may be contained in an amount of 20 to 90 parts by weight based on 100 parts by weight of the raw rubber, more preferably 30 to 70 parts by weight, and further preferably 40 to 60 parts by weight. If the content of the silica is less than 20 parts by weight, the strength of the rubber may not be improved and the braking performance of the tire may be deteriorated. If the content of the silica exceeds 90 parts by weight, the wear performance may be deteriorated.

Examples of the coupling agent include a sulfide-based silane compound, a mercapto-based silane compound, a vinyl-based silane compound, an amino-based silane compound, a glycidoxine clock silane compound, a nitro- based silane compound, a chlorosilicate compound, a methacrylic silane compound, May be used, and a sulfide-based silane compound may be preferably used.

The sulfide-based silane compound is preferably selected from the group consisting of bis (3-triethoxysilylpropyl) tetrasulfide, bis (2-triethoxysilylethyl) tetrasulfide, bis (2-trimethoxysilylethyl) tetrasulfide, bis (4-trimethoxysilylbutyl) tetrasulfide, bis (3-triethoxysilylpropyl) trisulfide, bis Bis (3-trimethoxysilylethyl) trisulfide, bis (4-triethoxysilylethyl) trisulfide, bis (4-trimethoxysilylbutyl) trisulfide, bis (3-triethoxysilylbutyl) disulfide, bis (4-triethoxysilylbutyl) disulfide, bis 3-trimethoxysilylpropyl) disulfide, bis (2-trimethoxy Triethoxysilylbutyl) disulfide, 3-trimethoxysilylpropyl-N, N-dimethylthiocarbamoyltetrasulfide, 3-triethoxysilylpropyl-N, N-dimethyl 2-triethoxysilylethyl-N, N-dimethylthiocarbamoyltetrasulfide, 2-trimethoxysilylethyl-N, N-dimethylthiocarbamoyltetrasulfide, 3-trimethoxysilyl 3-trimethoxysilylpropylmethacrylate monosulfide, 3-trimethoxysilylpropylmethacrylate monosulfide, and combinations thereof may be used in combination with at least one compound selected from the group consisting of benzothiazolyl tetrasulfide, 3-triethoxysilylpropylbenzothiazole tetrasulfide, 3-trimethoxysilylpropylmethacrylate monosulfide, And the like.

The mercaptosilane compound may be at least one selected from the group consisting of 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 2-mercaptoethyltrimethoxysilane, 2-mercaptoethyltriethoxysilane, May be any one selected from the group consisting of The vinyl-based silane compound may be any one selected from the group consisting of ethoxysilane, vinyltrimethoxysilane, and combinations thereof. The amino-based silane compound is preferably selected from the group consisting of 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3- (2-aminoethyl) aminopropyltriethoxysilane, 3- Methoxysilane, and a combination thereof.

The glycidoxime silane compound is preferably selected from the group consisting of? -Glycidoxypropyltriethoxysilane,? -Glycidoxypropyltrimethoxysilane,? -Glycidoxypropylmethyldiethoxysilane,? -Glycidoxypropylmethyldimethoxysilane And a combination thereof. The nitro-based silane compound may be any one selected from the group consisting of 3-nitropropyltrimethoxysilane, 3-nitropropyltriethoxysilane, and combinations thereof. The chloro-based silane compound is selected from the group consisting of 3-chloropropyltrimethoxysilane, 3-chloropropyltriethoxysilane, 2-chloroethyltrimethoxysilane, 2-chloroethyltriethoxysilane, and combinations thereof Lt; / RTI >

The methacrylic silane compound may be any one selected from the group consisting of? -Methacryloxypropyltrimethoxysilane,? -Methacryloxypropylmethyldimethoxysilane,? -Methacryloxypropyldimethylmethoxysilane, and combinations thereof Lt; / RTI >

The coupling agent may be included in an amount of 1 to 20 parts by weight based on 100 parts by weight of the raw rubber for improving dispersibility of the silica. If the content of the coupling agent is less than 1 part by weight, improvement in dispersibility of silica may be insufficient, resulting in deterioration of rubber workability and lowering of fuel consumption performance. When the amount exceeds 20 parts by weight, interaction between silica and rubber is too strong, May be excellent, but the braking performance may be very poor.

The softening agent is added to the rubber composition in order to impart plasticity to the rubber to facilitate processing or to decrease the hardness of the vulcanized rubber, and means an oil or other material used in rubber compounding or rubber production. The softening agent means an oil contained in a process oil or other rubber composition. The softener may be selected from the group consisting of petroleum oils, vegetable oils, and combinations thereof, but the present invention is not limited thereto.

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

Examples of the paraffin oil include P-1, P-2, P-3, P-4, P-5 and P-6 of Mychang Oil Co., N-1, N-2 and N-3 of Kokai Co., Ltd., and representative examples of the aromatic oils include A-2 and A-3 of Mingchang Oil Co.,

However, recently, when the content of the polycyclic aromatic hydrocarbons (hereinafter referred to as PAHs) contained in the aromatic oil is higher than 3 wt% together with the increase of the environmental consciousness, treated distillate aromatic extract oil, mild extraction solvate (MES) oil, residual aromatic extract (RAE) oil or heavy naphthenic oil.

Particularly, the oil used as the softening agent preferably has a total content of PAHs components of not more than 3 wt%, a kinematic viscosity of not less than 95 (210 S SUS), an aromatic component of 15 to 25 wt%, a naphthene component Of 27 to 37% by weight and a paraffinic component of 38 to 58% by weight can be preferably used.

The TDAE oil is advantageous for environmental factors such as the low temperature characteristics of the tire tread including the TDAE oil and the possibility of the cancer induction of PAHs while improving the fuel consumption performance.

Examples of the vegetable oils include vegetable oils such as castor oil, cottonseed oil, linseed oil, canola oil, soybean oil, palm oil, palm oil, peanut oil, pine oil, pine tar, tall oil, cone oil, rice bran oil, safflower oil, sesame oil, , Jojoba oil, macadamia nut oil, four flower oil, tung oil, and combinations thereof.

It is preferable that the softening agent is used in an amount of 0 to 150 parts by weight based on 100 parts by weight of the raw material rubber in order to improve workability of the raw material rubber.

The rubber composition for a tire tread can be produced through a conventional two-step continuous manufacturing process. That is, during the finishing step in which the first stage of thermomechanical treatment or kneading and the crosslinking system are mixed at a maximum temperature of 110 to 190 占 폚, preferably at a high temperature of 130 to 180 占 폚, typically less than 110 占 폚, And a second step of mechanical treatment at a low temperature of 40 to 100 DEG C in a suitable mixer, but the present invention is not limited thereto.

The rubber composition for a tire tread is not limited to a tread (a tread cap and a tread base) but may be included in various rubber components constituting the tire. Said rubber components include sidewalls, sidewall inserts, apex, chafer, wire coat or inner liner.

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

The tire may be, but is not limited to, a tire for an automobile, an airplane tire, an agricultural machine tire, an off-the-road tire, a truck tire, a bus tire, or the like . Further, the tire may be a radial tire or a bias tire, and preferably a radial tire.

The rubber composition for a tire tread according to the present invention improves the dispersibility of the additive at the time of mixing with the rubber composition, has excellent initial grip performance at the time of running and grip persistence, and improves wear resistance.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out 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 : Preparation of rubber composition]

Using the compositions shown in Tables 1 and 2, rubber compositions for tire treads according to the following Examples and Comparative Examples were prepared. The production of the rubber composition was in accordance with the usual production method of the rubber composition.

Comparative Example Example 1 Example 2 Example 3 Example 4 Rubber raw material ⁽¹⁾ 190.75 190.75 190.75 190.75 190.75 Carbon black ⁽²⁾ 65.00 65.00 65.00 65.00 65.00 TDAE oil 11.20 11.20 11.20 11.20 11.20 Oxide ^of metal ⁽³⁾ - 1.0 5.0 10.0 25.0 Zinc oxide 3.0 3.0 3.0 3.0 3.0 Stearic acid 1.0 1.0 1.0 1.0 1.0 brimstone 1.0 1.0 1.0 1.0 1.0 accelerant 2.5 2.5 2.5 2.5 2.5 Accelerator (DPG) 2 2 2 2 2

(Unit: parts by weight)

Example 5 Example 6 Example 7 Example 8 Rubber raw material ⁽¹⁾ 190.75 190.75 190.75 190.75 Carbon black ⁽²⁾ 65.00 65.00 65.00 65.00 TDAE oil 11.20 11.20 11.20 11.20 Oxide ^of metal ⁽⁴⁾
(The sedan length of the metal oxide) 1.0
(1.0 mm) 1.0
(0.2 mm) 1.0
(0.5 mm) 1.0
(10.0 mm) Zinc oxide 3.0 3.0 3.0 3.0 Stearic acid 1.0 1.0 1.0 1.0 brimstone 1.0 1.0 1.0 1.0 accelerant 2.5 2.5 2.5 2.5 Accelerator (DPG) 2 2 2 2

(Unit: parts by weight)

(1) Raw material rubber: styrene-butadiene rubber

(2) Carbon black: ultrafine carbon black (DBP absorption 360 m2 / g, Surface Area Bet 800 m2 / l)

(3) Metal oxide: 5 parts by weight of a tannin-based adhesive and 100 parts by weight of nickel oxide (length: 1.0 mm) coated with 10 parts by weight of cobalt-

(4) Metal oxide: 10 parts by weight of a tannin-based adhesive and 20 parts by weight of cobalt-boron based on 100 parts by weight of a metal oxide were coated with nickel oxide

[ Experimental Example : Measurement of physical properties of the prepared rubber composition]

The physical properties of the rubber specimens prepared in Examples and Comparative Examples were measured and the results are shown in Tables 3 and 4 below.

Comparative Example Example 1 Example 2 Example 3 Example 4 Initial grip performance 6 10 9 8 8 Late grip performance 2 10 8 7 6 300% modulus (Mpa) 72.1 72.2 68.9 69.1 69.4 Elongation (%) 800 810 799 791 801 Wear Index 100 140 131 124 119

Example 5 Example 6 Example 7 Example 8 Initial grip performance 10 8 7 6 Late grip performance 10 6 5 4 300% modulus (Mpa) 72.2 67.9 66.2 66.4 Elongation (%) 810 789 762 774 Wear Index 140 133 120 115

- The grip performance was measured by making the tire size 280 / 640R18 F200 constituting the tread portion using the rubber composition. The prepared tire was driven at an air pressure of 200 kPa, and the test driver measured the lap time at every running after 10 consecutive circuit courses (2 km) under dry conditions to evaluate the initial grip performance and the sustainability of the grip performance.

* Grip Performance Score Table: 1 (very bad) ~ 10 (very good)

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

- The abrasion resistance was measured by JIS K6264.

As shown in Table 3, the grip performance and wear resistance of the embodiment using the coated metal oxide were higher than those of the comparative example. As shown in Table 4, as the length of the metal oxide increases, Performance and wear reduction. Further, it can be confirmed that the coated metal oxide does not significantly affect other physical properties.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

Claims (5)

100 parts by weight of raw rubber, and
1.0 to 25.0 parts by weight of a metal oxide coated with tannin-based adhesives and cobalt-boron
And a rubber composition for a tire tread. The method according to claim 1,
Wherein the metal oxide is a short fiber which is truncated to a length of 0.1 to 10 mm. The method according to claim 1,
Wherein the metal oxide is an oxide of any one metal selected from the group consisting of iron, magnesium, nickel, copper and tungsten. The method according to claim 1,
Wherein the coated metal oxide comprises 5 to 20 parts by weight of the tannin-based adhesive and 5 to 20 parts by weight of the cobalt-boron based on 100 parts by weight of the metal oxide. A tire produced by using the rubber composition for a tire tread according to claim 1.