KR101481460B1 - 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 produced using the same, wherein the rubber composition for a tire tread comprises 100 parts by weight of a raw rubber and 5 to 20 parts by weight of a polyimide film which has been cut.
The rubber composition for a tire tread can improve the dispersibility of the compounding ingredients, improve the durability of the tire, and secure the initial and first half grip 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]

TECHNICAL FIELD 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 which can improve dispersibility of compounding ingredients, improve durability of a tire, Compositions and tires made therefrom.

In the case of a high-performance tire, the deterioration of the physical properties of the tread rubber rapidly deteriorates at the time of running for a long time. To improve this, a method of using a reinforcing resin or improving the durability by using a large amount of reinforcing carbon black is known. However, when the reinforcing resin is used, the endurance performance can be ensured, but the grip performance may be weak and the tire performance may be weak at the time of running. When a large amount of the reinforcing carbon black is used, .

Therefore, there is a need for research that can secure both grip performance and reinforcement performance at the same or higher level.

Korean Patent Publication No. 2003-0011356 (Published on Feb. 7, 2003)

It is an object of the present invention to provide a rubber composition for a tire tread which can improve the dispersibility of the blending components, improve the durability of the tire, and secure the initial and the front grip 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 accomplish the above object, the rubber composition for a tire tread according to an embodiment of the present invention includes 100 parts by weight of a raw rubber and 5 to 20 parts by weight of a polyimide film which has been cut.

The polyimide film may have an area of 2 to 20 mm ² and a thickness of 0.0125 to 0.1 mm.

The rubber composition for a tire tread may comprise 10 to 50 parts by weight of a master batch containing the polyimide film that is cut out with respect to 100 parts by weight of the raw rubber.

The masterbatch may include 100 parts by weight of latex, 50 to 150 parts by weight of a reinforcing filler, and 10 to 50 parts by weight of the polyimide film.

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.

A rubber composition for a tire tread according to an embodiment of the present invention comprises 100 parts by weight of a raw rubber and 5 to 20 parts by weight of a polyimide film which has been stretched.

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 includes the polyimide film which is made of the above-mentioned polyimide film, the durability of the tire can be improved and the early and the first half grip performance can be ensured.

The polyimide film is finely cut into a predetermined size so as to have a shape similar to a staple fiber. The polyimide may be prepared by condensing an aromatic tetracarboxylic acid anhydride and an aromatic diamine in the form of a film and heating the mixture at about 300 DEG C and dehydrating it. The polyimide may be an aromatic imide system or an aliphatic maleimide system.

The polyimide film may have an area of 2 to 20 mm ² and a thickness of 0.0125 to 0.1 mm. When the area of the polyimide film is less than ² mm ^2, dispersion of the polyimide film may be difficult due to bonding between the polyimide films. When the area of the polyimide film is more than 20 mm ² , bonding strength with carbon black may be weakened. When the thickness of the polyimide film is less than 0.0125 mm, dispersion of the polyimide film may be difficult due to bonding between the polyimide films. If the thickness of the polyimide film is more than 0.1 mm, the bonding strength with the carbon black may be weakened.

The content of the polyimide film may be 5 to 20 parts by weight based on 100 parts by weight of the raw rubber. When the content of the polyimide film is less than 5 parts by weight, it may be difficult to secure the target performance of the present invention. When the content of the polyimide film is more than 20 parts by weight, there may be a problem in workability.

The polyimide film may be added to the masterbatch in order to improve the dispersibility of the rubber composition for tire tread. That is, the rubber composition for a tire tread may comprise a masterbatch comprising the polyimide film. Specifically, the master batch may include 100 parts by weight of latex, 50 to 150 parts by weight of a reinforcing filler, and 10 to 50 parts by weight of the polyimide film.

The master batch comprising the polyimide film may be a wet master batch. The wet master batch is a master batch prepared by mixing components in a liquid phase, and a dry master batch is different from a solid master batch in a rubber mixing machine such as a banbury mixer. The wet master batch may be prepared by adding the reinforcing filler and the polyimide film to the emulsion of the latex and solidifying the mixture using an acid. The acid may be any one selected from the group consisting of nitric acid, hydrochloric acid, sulfuric acid, and combinations thereof, and is not particularly limited in the present invention. Further, the method may further include a step of coagulating with the acid and drying it to remove moisture.

The latex may be a latex of styrene-butadiene rubber, and the reinforcing filler may be carbon black or silica. When the content of the reinforcing filler is less than 50 parts by weight with respect to 100 parts by weight of the latex in the masterbatch, the rubber reinforcing effect may not be sufficient. When the content of the reinforcing filler is more than 150 parts by weight, It may not be suitable as a rubber composition. In addition, the content of the polyimide film in the master batch can be adjusted in accordance with the content of the polyimide film in the entire rubber composition for tire tread.

The master batch containing the polyimide film may be included in an amount of 10 to 50 parts by weight based on 100 parts by weight of the raw rubber. The content of the masterbatch can be appropriately adjusted in accordance with the content of the polyimide film in the entire rubber composition for tire tread.

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 a high performance tire for racing, but the present invention is not limited thereto. The tire may be used for a passenger car tire, an airplane tire, an agricultural tire, an off-the-road tire, Bus tires and the like. Further, the tire may be a radial tire or a bias tire, and preferably a radial tire.

INDUSTRIAL APPLICABILITY The rubber composition for a tire tread according to the present invention can improve the dispersibility of the blending components, improve the durability of the tire, and secure the initial and first half grip 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 Table 1 below. 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 Silica /
Coupling agent 75.00 /
10.00 75.00 /
10.00 75.00 /
10.00 75.00 /
10.00 75.00 /
10.00 Master batch ⁽²⁾ - 10 20 30 40 Zinc oxide / stearic acid 3.0 / 10.0 Sulfur / accelerator A / accelerator B 1.0 / 2.5 / 2

(Unit: parts by weight)

(1) Raw material rubber: styrene-butadiene rubber

(2) Master batch: A polyimide film having a thickness of 0.0125 mm was cut to a size of 1 mm in width and 5 mm in length, and then 100 parts by weight of styrene-butadiene latex, 100 parts by weight of carbon black and 30 parts by weight of the polyimide film Manufactured

[ 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 Table 2 below.

Comparative Example Example 1 Example 2 Example 3 Example 4 Horn / compounding performance 5 6 8 7.5 8 Emission performance 6 6 7.5 8 8 Road grip performance 6 6 6.5 6.5 7 300% modulus (Mpa) 42.1 54.1 57.9 60.1 62.4 Elongation (%) 650 710 712 719 721 Wear Index 100 120 132 134 139

- The horn / compounding performance was evaluated by comparing the mixing chart and the temperature condition.

* Horn / compound performance score table: 1 (very bad) ~ 10 (very good)

- Emission performance was assessed after discharge time and workability in kneader.

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

- The grip performance was determined by making the tires constituting the tread portion using the above rubber composition in the size of 240 / 640R18 F200, setting the tire to air pressure of 200 kPa, and driving the test driver in 10 cycles (2 km) The lap time was measured at every running after driving, and the initial grip performance and the sustainability of the grip performance were evaluated.

* 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 2, the horn / compounding performance and the discharge performance are excellent in the embodiment including the polyimide film as compared with the comparative example, and when the content of the polyimide film is increased, From the above, there was a problem in dischargeability, but it is not at a critical level and a level at which the work is impossible, and the physical properties are significantly improved as compared with the comparative example.

In addition, the physical properties of the above-mentioned examples show physical properties equal to or higher than those of the comparative examples. Especially, the abrasion index, which is an index required for high-speed travel, can be confirmed to be equal to or higher than that of the comparative example.

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 latex, 50 to 150 parts by weight of a reinforcing filler, and 10 to 50 parts by weight of a polyimide film which has been cut,
Wherein the polyimide film has an area of 2 to 20 mm ² , a thickness of 0.0125 to 0.1 mm,
A wet master batch prepared by adding the reinforcing filler and the polyimide film to the emulsion of the latex and solidifying the mixture using an acid. delete delete delete A tire produced using the wet master batch according to claim 1.