KR101470350B1 - Rubber composition for tire tread and tire manufactured by using the same - Google Patents

Abstract

TECHNICAL FIELD The present invention relates to a rubber composition for a tire tread and a tire made using the same, and includes polyvinylpyrrolidone.
The rubber composition for a tire tread can prevent environmental pollution while ensuring physical properties equal to or higher than that of the tire tread, and improve running performance.

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. The rubber composition for a tire tread of the present invention can prevent environmental pollution while ensuring physical properties equal to or higher than that of the rubber composition, .

A rubber composition for a tire tread, and a tire made using the same.

The role of petroleum resin in the racing tire is to move the tire to the road surface when the resin contained in the tread reaches a certain softening point by the friction with the road surface, thereby improving the adhesion with the road surface and raising the grip. However, the chemicals left on the road after the race are absorbed by the road surface in case of rain, causing environmental pollution problems. Therefore, it is necessary to develop an alternative resin that is harmless to the human body while exhibiting an equivalent level of grip performance.

Korean Laid-Open Publication No. 2009-0056855 (Published on June 3, 2009)

An object of the present invention is to provide a rubber composition for a tire tread which can prevent environmental pollution while securing physical properties equal to or higher than that of the tire, and improve running performance.

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 includes polyvinylpyrrolidone.

The rubber composition for a tire tread may include 100 parts by weight of raw rubber and 1 to 50 parts by weight of the polyvinylpyrrolidone.

The polyvinylpyrrolidone may be concentrated to 20 to 70% by weight.

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 a tire tread according to an embodiment of the present invention includes polyvinylpyrrolidone. The rubber composition for a tire tread uses the polyvinyl pyrrolidone in place of a petroleum resin.

Even if the petroleum resin is replaced with the polyvinylpyrrolidone, it is possible to secure physical properties equal to or higher than that of the petroleum resin, and the running performance can be improved. In addition, the polyvinylpyrrolidone is non-toxic and can improve the environmental friendliness of the rubber composition for a tire tread.

The rubber composition for a tire tread may include 100 parts by weight of raw rubber and 1 to 50 parts by weight of the polyvinylpyrrolidone.

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.

Particularly, the raw material rubber of the rubber composition for a tire tread is selected from the group consisting of polyisoprene rubber, polybutadiene rubber, conjugated diene aromatic vinyl copolymer, nitrile conjugated diene copolymer, hydrogenated NBR, hydrogenated NBR, olefin rubber, Any one selected from the group consisting of propylene rubber, butyl rubber, copolymer of isobutylene and aromatic vinyl or diene monomer, acrylic rubber, ionomer, halogenated rubber, chloroprene rubber, and combinations thereof may be used.

The polyvinylpyrrolidone is non-toxic polyvinylpyrrolidone, and a stationary paste readily available on the market can be used. The stationary paste may be polyvinylpyrrolidone having a polyvinylpyrrolidone concentration of 20 to 70% by weight and a softening point of 100 to 110 ° C. When polyvinylpyrrolidone contained in the stationary paste is used, the processability of the rubber composition for a tire tread can be improved. Polyvinylpyrrolidone having a softening point within the above range has a softening point similar to that of a conventional petroleum resin, By having an average molecular weight, the rubber composition for tire tread has physical properties equal to or higher than that of the rubber composition for tire tread. In addition, the polyvinyl pyrrolidone is excellent in workability because it does not cause dust during mixing of the horn, and it can be used as a substitute for a petroleum resin to improve dischargeability, ensure uniform physical properties, prevent environmental pollution, and improve running performance .

When the content of the polyvinylpyrrolidone is in the range of 1 to 50 parts by weight, the environment-friendliness can be improved without lowering the physical properties of the rubber composition for a tire tread by replacing the existing petroleum resin.

The rubber composition for a tire tread may further include various additives such as an additional vulcanizing agent, a vulcanization accelerator, a vulcanization accelerator, a filler, a coupling agent, an anti-aging agent or a softening agent. 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 may be an inorganic vulcanizing agent such as powdered sulfur (S), insoluble sulfur (S), precipitated sulfur (S), or colloid sulfur. 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 antioxidant is an additive used to stop the chain reaction in which the tire is autoxidized 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.

Considering the conditions that the solubility of the antioxidant in addition to the anti-aging action is high, the solubility in the rubber is small, the volatility is small, the solubility should be inactive to the rubber, and the vulcanization should not be inhibited, 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 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 can be suitably applied to a racing tire, but it can also be used for a passenger car tire, a racing tire, an airplane tire, an agricultural machine tire, an off-the-road tire, a truck tire or a bus tire.

The rubber composition for a tire tread according to the present invention can prevent environmental pollution while ensuring physical properties equal to or higher than that of the tire, and improve running performance.

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]

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

Comparative Example 1 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 Oil ⁽³⁾ 11.20 11.20 11.20 11.20 11.20 Petroleum resin ⁽⁴⁾ 13 - - - - Polyvinyl pyrrolidone ⁽⁵⁾ - 6.5 13 26 39 Zinc oxide 3.0 Stearic acid 1.0 brimstone 1.0 accelerant 2.5 Accelerator (DPG) 2

(Unit: parts by weight)

(1) Styrene-butadiene rubber (oil: 90.75 parts by weight)

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

(3) Oil: TDAE oil

(4) Petroleum resin: P-90

(5) Polyvinylpyrrolidone (Non-toxic PVP): Stationary paste (Amos product)

Comparative Example 2 Example 5 Example 6 Example 7 Example 8 Rubber raw material ⁽¹⁾ 190.75 190.75 190.75 190.75 190.75 Silica /
Coupling agent 65.00
10.00 75.00
10.00 75.00
10.00 75.00
10.00 75.00
10.00 Oil ⁽²⁾ 11.20 11.20 11.20 11.20 11.20 Petroleum resin ⁽³⁾ 13 - - - - Polyvinyl pyrrolidone ⁽⁴⁾ - 6.5 13 26 39 Zinc oxide 3.0 Stearic acid 1.0 brimstone 1.0 accelerant 2.5 Accelerator (DPG) 2

(Unit: parts by weight)

(1) Styrene-butadiene rubber (oil: 90.75 parts by weight)

(2) Oil: TDAE oil

(3) Petroleum resin: P-90

(4) Polyvinylpyrrolidone (non-toxic PVP): Stationary paste (Amos products)

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

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

Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Horn / compounding performance ⁽¹⁾ 5 9 9 9 9 Emission performance ⁽²⁾ 6 8 8 8 9 Initial grip performance ⁽³⁾ 6 10 9 8 8 Second-half grip performance ⁽³⁾ 2 10 8 7 6 300% modulus (Mpa) ⁽⁴⁾ 62.1 64.1 61.9 49.1 39.4 Elongation percentage (%) ⁽⁴⁾ 700 710 720 701 621 Wear Index ⁽⁵⁾ 100 120 132 134 139

Comparative Example 2 Example 5 Example 6 Example 7 Example 8 Horn / compounding performance ⁽¹⁾ 5 6 6 6 7 Emission performance ⁽²⁾ 5 7 7 8 8 Initial grip performance ⁽³⁾ 6 10 8 7 6 Second-half grip performance ⁽³⁾ 2 10 6 5 4 300% modulus (Mpa) ⁽⁴⁾ 72.1 81.3 74.2 63.1 59.4 Elongation percentage (%) ⁽⁴⁾ 800 820 767 752 744 Wear Index ⁽⁵⁾ 100 120 123 121 125

(1) The horn / compounding performance was evaluated by comparing the mixing chart and the temperature condition between the comparative example and the example.

- Horn / compounding performance score table: 1 (very poor) to 10 (very good)

(2) The discharge performance was evaluated by the time and the workability of the kneader after mixing.

- Emission performance score table: 1 (very poor) to 10 (very good)

(3) The grip performance was determined by using a tire (size: 280 / 640R18 F200) including a tread portion manufactured using the above rubber composition, with an air pressure of 200 kPa and a test driver driving the circuit course (2 km) The lap time was measured at each subsequent run to evaluate the initial grip performance and the sustainability of the grip performance.

- Grip Performance Score Table: 1 (very poor) to 10 (very good)

(4) 300% modulus and elongation were measured according to ISO 37 standard.

(5) The abrasion resistance was measured according to JIS K6264.

As shown in Tables 3 and 4, when polyvinylpyrrolidone is used in place of a petroleum resin, the horn / compounding performance and the exhausting performance are excellent, and the index necessary for high- It was confirmed that the wear resistance was improved significantly.

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 the raw rubber,
1 to 50 parts by weight of polyvinylpyrrolidone having a softening point of 100 to 110 DEG C and
30 to 80 parts by weight of carbon black having a nitrogen adsorption specific surface area (N ₂ SA) of 30 to 300 m ² / g and an oil absorption amount of dibutyl phthalate (DBP) of 60 to 180 cc / 100 g,
A rubber composition for a tire tread not containing a petroleum resin.
And a rubber composition for a tire tread. delete The method according to claim 1,
Wherein the polyvinylpyrrolidone is concentrated to 20 to 70% by weight. delete A tire produced by using the rubber composition for a tire tread according to claim 1.