KR101299943B1 - Rubber composition for tire tread 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, and includes ultra-fine carbon black surface-treated with amino benzoic acid.
The tire tread rubber composition induces early heat generation of the tire tread at high speed, thereby improving the grip performance, and increasing the time taken to reduce the physical properties of the rubber composition, thereby improving the performance, thereby reducing the durability and wear resistance performance time. It can also be greatly increased, so it can be used very advantageously for high speed endurance competition.

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 composition for a tire tread and a tire manufactured using the same, and may be used in a tread rubber composition of a high performance passenger car tire or a racing tire.

Conventionally, the rubber composition for tire treads increases the amount of carbon black packed or uses styrene butadiene rubber with high styrene content in order to further improve the grip performance of the tire tread portion.

However, when a large amount of carbon black is filled, there is a problem that the weight of the tire is increased and heat resistance and wear resistance are lowered. In particular, since the finer carbon black is used for the purpose of high-speed driving, there are many problems in terms of cost and continuous productivity.

In addition, when the content of the styrene butadiene rubber exceeds a certain level, the grip performance of the tire tread portion is greatly reduced, thereby causing a problem that the durability and wear resistance performance is also greatly reduced.

Accordingly, while significantly reducing the carbon black content, it is possible to improve the grip performance of the tire tread portion at high speed, and to develop a tire tread rubber composition that can improve the performance by increasing the time taken for deterioration of durability and wear resistance performance. .

An object of the present invention is to induce early rapid heat generation of the tire tread at high speed, improve grip performance, increase the time taken to reduce the physical properties of the rubber composition to improve the performance, and thus the time required to reduce the durability and wear resistance performance significantly It is possible to provide a rubber composition for a tire tread that can be stretched and can be very advantageously used for high speed endurance.

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, the rubber composition for tire treads according to one embodiment of the present invention includes ultra-fine carbon black surface-treated with amino benzoic acid.

The ultrafine carbon black may be carbon nanotubes.

The carbon nanotubes may have an average length of 1 to 100 μm and an average diameter of 30 to 300 nm.

The carbon nanotubes surface-treated with the amino benzoic acid may be surface-treated with 5 to 90 parts by weight of amino benzoic acid based on 100 parts by weight of the carbon nanotubes.

The tire tread rubber composition may include 100 parts by weight of raw material rubber, 5 to 100 parts by weight of carbon black, and 5 to 50 parts by weight of ultrafine carbon black surface-treated with the amino benzoic acid.

The carbon black may have a DBP oil absorption of 360 to 495 m 2 / g and a BET specific surface area of 100 to 1000 m 2 / l.

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 tire tread rubber composition comprises ultra fine carbon black surface-treated with amino benzoic acid. The ultrafine carbon black may be preferably carbon nanotubes.

Carbon black, which is conventionally used to improve the grip performance of tire treads, is not desirable in terms of environment, which is the biggest problem in the tire industry in recent years in that it is difficult to continuously supply, expensive, and fill a large amount. .

Thus, the rubber composition for the tire tread may exhibit the same level of physical properties as the case of adding a large amount of the existing carbon black while including a small amount of the ultra-fine carbon black.

In addition, the ultrafine carbon black is modified using amino benzoic acid having a carboxyl group for affinity with rubber. Accordingly, the ultra-fine carbon black surface-treated with the amino benzoic acid can be used in a small amount, while maintaining the same physical properties as in the prior art, it may be a good way in terms of preparation and weight reduction due to exhaustion of petroleum resources.

The carbon nanotubes may have an average length of 1 to 100 μm and an average diameter of 30 to 300 nm. When using ultra fine carbon black finer than the carbon nanotubes, the physical properties of the rubber may be reduced.

The carbon nanotubes surface-treated with the amino benzoic acid may be surface-treated with 5 to 90 parts by weight of amino benzoic acid based on 100 parts by weight of the carbon nanotubes. When the surface treatment content of the amino benzoic acid is less than 5 parts by weight, it may be difficult to secure the dispersibility of the carbon nanotubes, and when it exceeds 90 parts by weight, the effect of improving the physical properties of the rubber composition through the addition of carbon nanotubes may be insignificant.

The tire tread rubber composition may include 100 parts by weight of raw rubber, 5 to 100 parts by weight of general carbon black, and 5 to 50 parts by weight of ultrafine carbon black surface-treated with the amino benzoic acid.

When the content of the ultrafine carbon black surface-treated with the amino benzoic acid is within the above range, the carbon black content may be reduced to about 1/20 of the content of the existing carbon black while securing equivalent physical properties or higher, and tires at high speeds. Induces early heat generation of the tread to improve grip performance and prevent degradation of properties of durability and wear resistance. In addition, it can be expected to improve the performance by increasing the time taken to decrease the physical properties of the rubber composition through this, it can also be expected to improve the braking performance in wet road conditions, it can also be expected to reduce the weight of the tire.

The general carbon black may be a conventional carbon black used in the rubber tread rubber composition, but preferably a DBP oil absorption of 360 to 495 m 2 / g, and a BET specific surface area of 100 to 1000 m 2 / l, More preferably, the DBP oil absorption amount is 360 to 440 m 2 / g, and a BET specific surface area of 500 to 900 m 2 / l can be used.

When the DBP oil absorption amount is 360 to 495 m 2 / g and the carbon black having a BET specific surface area of 100 to 1000 m 2 / l is used together with the ultra-fine particle carbon black, it is preferable in that fast grip performance can be exhibited.

The carbon black may be included in an amount of 5 to 100 parts by weight based on 100 parts by weight of the raw material rubber. When the content of the carbon black is less than 5 parts by weight based on 100 parts by weight of the raw material rubber, the reinforcing performance of the carbon black, which is a reinforcing filler, may be deteriorated. When the content of the carbon black exceeds 100 parts by weight, the processability of the tread rubber composition may be deteriorated. have.

In addition, the rubber composition for the tire tread may be prepared in the form of a master batch to further improve the dispersibility in the rubber matrix. For example, the master batch may be prepared by mixing the ultrafine carbon black, SBR latex, and oil, the surface of which is modified with amino benzoic acid, in a predetermined ratio, and then drying. Through this, it is possible to further improve the dispersibility of the ultrafine carbon black in the blending process.

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. 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, bromo methyl 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 rubbers include polyisoprene rubber, polybutadiene rubber, conjugated diene aromatic vinyl copolymer, nitrile conjugated diene copolymer, hydrogenated NBR, hydrogenated SBR, olefin rubber, ethylene-propylene rubber modified with maleic acid, butyl rubber Any one selected from the group consisting of a copolymer of isobutylene and an aromatic vinyl or diene monomer, an acrylic rubber, a halogenated rubber, a chloroprene rubber, and a combination thereof can be preferably used.

The tire tread rubber composition may optionally further include various additives such as additional vulcanizing agents, vulcanization accelerators, vulcanization accelerators, fillers, coupling agents, anti-aging agents, softeners or pressure-sensitive adhesives. 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 4.0 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. 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 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 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 tire tread rubber composition may further include a filler. The filler may be selected from the group consisting of silica, calcium carbonate, clay (hydrated aluminum silicate), aluminum hydroxide, lignin, silicate, talc, and combinations thereof.

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 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 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 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 refers to oils included in process oil, extender oil, and other rubber compositions. 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.

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, it is known that cancer is more likely to cause cancer when the content of polycyclic aromatic hydrocarbons (hereinafter referred to as "PAH") included in the aromatic oil is 3% by weight or more with increasing environmental awareness. , TDAE (treated distillate aromatic extract) oil, mild extraction solvate (MES) oil, residual aromatic extract (RAE) oil or heavy naphthenic oil can be preferably used.

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.

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 softening agent 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 the processability of the raw material rubber. The content of the softener is the sum of the amount of extender oil used in the raw material rubber, the content of the processed oil and the oils used in other rubber compositions.

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 an amine type, a phenol type, a quinoline type, an imidazole type, a carbamic acid metal salt, a wax and a combination thereof can be appropriately selected and used.

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, waxy hydrocarbons 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 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 a first step (referred to as a "non-production" step) of thermomechanical treatment or kneading at a maximum temperature of 110-190 ° C, preferably 130-180 ° C, and a crosslinking system are mixed, Can be prepared in a suitable mixer using a second stage (referred to as the "production" step) of mechanically treating at a low temperature, typically below 110 ° C, for example 40-100 ° C, but the invention is not so limited .

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. 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, a racing tire, an airplane tire, a farm tire, an off-the-road tire, a truck tire or a bus tire. In addition, the tire may be a radial tire or a bias tire, and is preferably a radial tire.

The rubber composition for a tire tread according to an embodiment of the present invention induces early heat generation of the tire tread at high speed, thereby improving grip performance and increasing the time taken to decrease the physical properties of the rubber composition, thereby improving durability. In addition, the time required for degradation of wear resistance and performance can be greatly increased, which can be very advantageously used for high-speed endurance.

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.

[Production Example: Production of Rubber Composition]

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

Comparative Example Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Rubber raw material ⁽¹⁾ 125.5 125.5 125.5 125.5 125.5 125.5 125.5 Carbon Black ⁽²⁾ 73.7 23.7 23.7 23.7 23.7 23.7 23.7 Ultrafine Carbon Black ⁽³⁾ - 0.1 0.5 1.0 10.0 25.0 50.0 Zinc oxide 3.0 Stearic acid 1.0 brimstone 1.0 accelerant 2.5 Accelerator (DPG) 2

(Unit: parts by weight)

(1) Raw material rubber: Styrene-butadiene rubber (including 25.5 parts by weight of oil).

(2) Carbon black: Carbon black having a DBP oil absorption of 360 m 2 / g and a BET surface area of 800 m 2 / l.

(3) Ultrafine carbon black: carbon nanotubes whose surface is modified with amino benzoic acid (MWNT, carbon nanotubes have an average length of 60 μm and an average diameter of 100 nm, and surface by 20 parts by weight of amino benzoic acid with respect to 100 parts by weight of carbon nanotubes). Processed).

Experimental Example: Measurement of Physical Properties of Prepared Rubber Composition

The physical properties of the rubber specimens prepared in Examples and Comparative Examples were measured, and the results are shown in Table 2 below.

In Table 2 below, the Mooney viscosity (ML1 + 4 (125 ° C)) was measured by ASTM specification D1646. ML1 + 4 represents the viscosity of the unvulcanized rubber, and the lower the value, the better the workability of the unvulcanized rubber.

Hardness was measured according to DIN 53505. Hardness indicates steering stability. The higher the value, the better the steering stability.

The 300% modulus is the tensile strength at 300% elongation measured according to the ISO 37 standard, and the higher the value, the better the strength.

Elongation was measured by the method of expressing the strain value (%) until the test piece breaks in a tensile tester.

Viscoelasticity was measured from -60 ° C. to 80 ° C. at 10 Hz frequency at 0.1% strain using Rheometrics Dynamic Spectrometer (RDS). At this time, the higher the 0 ° C tanδ value, the better the braking performance on the wet road surface, and the lower the 60 ° C tanδ value, the lower the rolling resistance.

Comparative Example Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Mooney Viscosity (ML1 + 4 (125 ℃)) 71 73 75 78 81 85 88 Hardness (Shore A) 82 67 72 75 77 83 90 300% Modulus (Mpa) 53.5 48.4 53.5 54.7 59.3 73.5 75.4 Elongation (%) 684.3 735.5 684.3 707.5 668.9 638.5 591.4 0 ℃ tanδ 0.2868 0.3031 0.3308 0.3269 0.3463 0.3558 0.4057 60 ℃ tanδ 0.2504 0.2554 0.2644 0.2638 0.2641 0.2649 0.2748

Referring to Table 2, it can be seen that the rubber composition of the embodiment has an overall increase in the 0 ℃ tan δ and 60 ℃ tan δ values compared to the rubber sample of the comparative rubber composition for the conventional tread. In addition, by applying the ultra-fine carbon black with the surface modified, it can be seen that it exhibits very advantageous properties in terms of durability and heat generation characteristics and braking performance on wet road surface by inducing early heat generation at high speed.

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 right.

Claims (7)

100 parts by weight of raw rubber,
5 to 100 parts by weight of carbon black, and
25 to 50 parts by weight of ultrafine carbon black, surface-treated with amino benzoic acid
Including;
The ultrafine carbon black is a carbon nanotube having an average length of 1 to 100μm and an average diameter of 30 to 300nm,
The carbon black has a DBP oil absorption of 360 to 495 m 2 / g, the BET specific surface area of 100 to 1000 m 2 / l rubber composition for tire tread. delete delete The method of claim 1,
The carbon nanotubes surface-treated with the amino benzoic acid are surface-treated with 5 to 90 parts by weight of amino benzoic acid based on 100 parts by weight of the carbon nanotubes. delete delete A tire manufactured using the rubber composition for tire tread according to any one of claims 1 and 4.