KR20130077212A - Rubber composition for tire tread and tire manufactured by using the same - Google Patents

Abstract

PURPOSE: A rubber composition for a tire tread is provided to improve physical properties by using a red clay short fiber, to reduce smells of a tire rubber by the deodorizing effect of red clay, and to have a self-humidifying function. CONSTITUTION: A rubber composition for a tire tread comprises 5-15 parts by weight of a red clay short fiber per 100.0 parts by weight of a raw rubber. The average length of the short fiber is 2.0-5.0 mm and the average particle diameter is 10-30 micron. The rubber composition includes a raw rubber including a styrene butadiene rubber and a butadiene rubber. The nitrogen surface area per gram is 30-300 m^2/g and the DBP (n-dibutyl phthalate) absorption amount is 60-180 cc/100g.

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]

TECHNICAL FIELD The present invention relates to a rubber composition for a tire tread and a tire made using the same, and can be used for a rubber composition for a tread of a tire for a passenger car.

Conventionally, various natural and synthetic staple fibers have been mixed with a tread for a tire in order to reinforce the properties of the tire tread rubber. Recently, a lot of nanoscale fibers have been developed and applied to tire rubber actively , It is still difficult to mass produce tires using such expensive new material fibers.

In recent years, awareness of the environment has been heightened and studies for manufacturing tires using eco-friendly materials along with well-being fever have been actively carried out. However, there are many difficulties in maintaining and improving the performance of tires including environmentally friendly materials.

Loess is a natural soil composed of silica and soil containing hydrous iron oxide and anhydrous iron oxide, covering 10% of the surface and is most widely distributed in semi-arid areas. In the loess, a lot of silica and feldspar are mixed, and the size of the loess particles is mainly 0.02 to 0.05 mm.

A spoonful of loess has about 200 million microorganisms, and various enzymes are known to cause circulation. It is a typical eco-friendly material that has been attracting attention due to the increase of consciousness of health enough to be used as soil without disease.

The loess contains four enzymatic components, catalase, diphenoxidase, saccharase, and protease. Each of these enzymes plays a role in toxin removal, degradation, fertilizer elements, purification, and helps to inhibit fungi and bacteria. In addition, yellow loess also absorbs moisture at high humidity, and has excellent humidity control ability to dissipate moisture when dried. It also emits a large amount of far infrared rays and shields harmful electromagnetic waves. In addition, it has deodorizing effect and has been used for various purposes such as tableware, clothes, building interior materials and exterior materials, and when it is mixed with other materials, it can manifest all the effects of each material and is widely used as a composite material.

Accordingly, development of a tread rubber composition containing an environment-friendly material has been required in accordance with the recent well-being atmosphere while improving the physical properties of the tire rubber without using an expensive material.

It is an object of the present invention to provide a rubber composition for a tire tread that is environmentally friendly and health-friendly, while improving physical properties of the tire.

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

In order to achieve the above object, the present invention provides a rubber composition for tire tread comprising 5-15 parts by weight of loess staple fibers relative to 100 parts by weight of raw rubber.

The loess staple fibers may be stained with loess, and the loess staple fibers may contain 10 to 100 parts by weight of loess relative to 100 parts by weight of the staple fibers.

The staple fibers may be nylon staple fibers, and the staple fibers may have an average length of 0.2 to 5.0 mm and an average diameter of 10 to 30 m.

The rubber composition comprises a raw rubber containing styrene butadiene (SBR) rubber and butadiene (BR) rubber, a nitrogen surface area per gram (N ₂ SA) of 30 to 300 m 2 / g, dibutyl phthalate) having an oil absorption of 60 to 180 cc / 100 g.

The present invention also provides a tire produced 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 comprises a loess short fiber.

In the present invention, the coating means changing the quality of the surface by covering the surface of the underlying material with a thin film of another component thereof. In the present invention, dyeing refers to a process of applying water to a yarn using a dye, In the invention, coating or dyeing refers to all the methods of covering the surface of a short fiber with a loam, changing the quality of the surface of the short fiber, or applying loess to a short fiber.

The raw material rubber may be any material as long as it is used in a conventional rubber composition for a tire tread, and 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.

The raw rubber preferably includes 70 to 90 parts by weight of styrene butadiene rubber (SBR) and 10 to 30 parts by weight of butadiene rubber, more preferably 70 to 85 parts by weight of styrene butadiene rubber and 15 to 30 parts by weight of butadiene rubber More preferably from 75 to 85 parts by weight of styrene butadiene rubber and from 15 to 25 parts by weight of butadiene rubber, still more preferably from 78 to 82 parts by weight of styrene butadiene rubber and from 18 to 22 parts by weight of butadiene rubber.

In order to improve the cut-chipping property of the raw material, the styrene-butadiene rubber having high mechanical rigidity may be used in an amount of 70 to 90 parts by weight, and the butadiene rubber may be used in an amount of 10 to 30 parts by weight in order to improve abrasion resistance. If the content of the butadiene rubber exceeds 30 parts by weight, the cut-chipping property may be deteriorated. If the content of the butadiene rubber is less than 10 parts by weight, abrasion resistance may be deteriorated.

The styrene-butadiene rubber is a kind of synthetic rubber obtained by copolymerization of styrene and butadiene. Specifically, the styrene content is 22 to 28 wt%, the vinyl content in butadiene is 55 to 75 wt%, and the styrene content is 24 to 26 By weight and the vinyl content in the butadiene is 65 to 70% by weight.

The butadiene rubber is preferably a gossybutadiene rubber having a cis-1,4 butadiene content of 96% by weight or more and a glass transition temperature (Tg) of -85 to -70 캜, preferably -80 to -75 캜 High Cis-Butadiene rubber). When the gossybutadiene rubber is used, there is an advantageous effect in terms of wear resistance and heat build up under dynamic stress.

The staple fibers mean that the average length of one staple is short, and preferably the average length is 2.0 to 5.0 mm. If the average length of the staple fibers is less than 2.0 mm, there may be a problem in the reinforcing property of the tire rubber. If the average length of the staple fibers exceeds 5.0 mm, an effect adversely affecting fiber dispersion may occur. Further, the staple fibers may have an average diameter of 10 to 30 mu m, preferably 13 to 18 mu m. If the average diameter of the staple fibers is less than 10 탆, the reinforcing properties of the tire may be disadvantageous. If the average diameter of the staple fibers exceeds 30 탆, the performance of the staple fibers may be deteriorated.

The short fibers may be any one selected from the group consisting of natural short fibers and synthetic short fibers. Examples of natural staple fibers include cotton or wool, and synthetic staple fibers include nylon, polyester, acrylic, vinylon, or aramid fibers. In the present invention, nylon staple fibers are preferred because they enhance the reinforcing effect of staple fibers.

The staple fiber may preferably be a loess staple fiber dyed with loess.

The loess is a natural soil composed of silica and soil containing hydrous iron oxide and anhydrous iron oxide, has a fine particle size of about 0.02 to 0.05 mm, and can be used as a dye. There is a lot of silica and feldspar mixed, and the more the iron oxide is contained, the stronger the red color appears.

The loess staple fibers can be produced by a conventional method of staining the staple fibers with loess. As an example, fine yellow loess powder sieved is mixed with water, and the mixture is stirred for several hours. Then, the process of removing impurities and water in the upper layer is repeated about 3 to 4 times while leaving only yellow soil. Sodium chloride is stirred in the gel- And the staple fiber is added to the loess dyestuff, and the staple fiber is stirred and dyed 3 to 4 times, followed by drying, so that the loess staple fiber can be produced.

The loess staple fibers may contain 10 to 100 parts by weight of loess, preferably 20 to 50 parts by weight, based on 100 parts by weight of the staple fibers. If the content of the loess in the loess staple fiber is less than 10 parts by weight, there is a problem that the staining is not good. If the content is more than 100 parts by weight, there is a problem that the coating is excessively left on the staple fibers.

In the case of a tire produced by using a rubber composition for tire tread including loess short fibers stained or coated with staple fibers with loess, the properties of the tire are excellent due to the reinforcing effect of the short fibers, It is possible to produce a health-friendly tire for a tire user who can reduce the smell of rubber, control the humidity of the tire itself, emit far-infrared rays, and improve the air quality of the car parked room Let's do it.

The loess staple fibers may be included in an amount of 5 parts by weight to 40 parts by weight, preferably 5 parts by weight to 15 parts by weight, based on 100 parts by weight of the raw rubber. When the amount of the loess staple fiber is less than 5 parts by weight, the reinforcing property of the tire becomes weak. When the content is more than 40 parts by weight, the stiffness of the tire becomes too strong, which may cause a problem of hardness.

The reinforcing filler is preferably at least one selected from the group consisting of carbon black, silica and mixtures thereof, and the content thereof is preferably 10 to 100 parts by weight based on 100 parts by weight of the raw rubber.

The carbon black may have a nitrogen surface area per gram (N ₂ SA) of 30 to 300 m 2 / g, an oil absorption of DBP (n-dibutyl phthalate) of 60 to 180 cc / 100 g, The nitrogen adsorption specific surface area can be 80 to 100 m 2 / g, the DBP oil absorption amount can be 60 to 90 cc / 100 g, and the present invention is not limited thereto.

If the nitrogen adsorption specific surface area of the carbon black exceeds 300 m < 2 > / g, the workability of the tire rubber composition 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 deteriorate. If the DBP oil absorption is less than 60 cc / 100 g, the reinforcing performance of 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 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 the silica as the filler may be deteriorated, and if it exceeds 170 m &

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 rubber composition for a tire tread may further include various additives such as a vulcanizing agent, a vulcanization accelerator, a vulcanization accelerator, a softening agent, an anti-aging agent or a pressure-sensitive adhesive. 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 said vulcanizing agent, a sulfur type vulcanizing agent can be used preferably. The sulfur-based vulcanizing agent may be inorganic vulcanizing agents such as powdered sulfur (S), insoluble sulfur (S), precipitated sulfur (S), colloidal sulfur (colloid sulfur). 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.

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

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

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

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 or 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.

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

However, 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.

In particular, the oil used as the softener has a total content of PAHs component of 3% by weight or less, a kinematic viscosity of 95 or more (210 ° F SUS), an aromatic component in the softener of 15 to 25% by weight, and a naphthenic component TDAE oils having 27 to 37% by weight and 38 to 58% by weight of the paraffinic component 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 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 pressure-sensitive adhesive further improves the tack performance between the rubber and the rubber and improves the physical properties of the rubber by improving the mixing properties, dispersibility and processability of other additives such as fillers.

As the pressure-sensitive adhesive, natural resin-based pressure-sensitive adhesives such as rosin-based resins or terpene-based resins, and synthetic resin-based pressure-sensitive adhesives such as petroleum resins, coal tar, or alkyl phenol-based resins may be used.

The rosin-based resin may be any one selected from the group consisting of rosin resin, rosin ester resin, hydrogenated rosin ester resin, derivatives thereof, and combinations thereof. The terpene-based resin may be any one selected from the group consisting of terpene resins, terpene phenol resins, and combinations thereof.

Wherein the petroleum resin is selected from the group consisting of an aliphatic resin, an acid-modified aliphatic resin, an alicyclic resin, a hydrogenated alicyclic resin, an aromatic (C9) resin, a hydrogenated aromatic resin, a C5-C9 copolymer resin, a styrene resin, And a combination thereof.

The coal tar may be a coumarone-indene resin.

The alkylphenol resin may be a p-tert-alkylphenol formaldehyde resin or resorcinol formaldehyde resin, and the p-tert-alkylphenol formaldehyde resin may be a p-tert-butyl-phenol formaldehyde resin, - octyl-phenol formaldehyde, and combinations thereof.

The pressure-sensitive adhesive may be included in an amount of 2 to 4 parts by weight based on 100 parts by weight of the raw rubber. If the amount of the pressure-sensitive adhesive is less than 2 parts by weight based on 100 parts by weight of the raw material rubber, the adhesion performance may be deteriorated. If the amount is more than 4 parts by weight, rubber properties may be deteriorated.

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 step of thermomechanical treatment or kneading at a maximum temperature ranging from 110 to 190 ° C., preferably from 130 to 180 ° C. and the crosslinking system is mixed, typically less than 110 ° C., for example It can be prepared in a suitable mixer using a second step of mechanical treatment at a low temperature of 40 to 100 ℃, but the present invention is not limited thereto.

The rubber composition for the tire tread is not limited to the tread (tread cap and tread base), and may be included in various rubber components constituting the tire. Such rubber components include sidewalls, sidewall inserts, apex, chafers, wire coats or innerliners, and the like.

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

The tire may be a passenger car tire, 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 one embodiment of the present invention is reinforced with a loess of staple fibers to improve the physical properties, as well as to mitigate the smell of the tire rubber by deodorizing effect of the loess, to control the humidity of the tire itself, To produce a health-friendly tire for a tire user who can improve the quality of the air in a parked room.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

[ Manufacturing example : Preparation of Rubber Composition]

Using 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.

The loess staple fiber was prepared as follows.

30 to 60 g of fine loess powder sieved through a sieve was added to 120 to 240 L of water, mixed well and precipitated for about 24 to 48 hours to remove only the yellow soil and remove impurities and water in the upper layer. The impurity removing operation as described above is repeated 3 to 4 times to obtain 2 to 2.5 g of sodium chloride as a yellow ocher in the gel state, followed by stirring to prepare an ocher dye. The yellow loose staple fiber was stirred with the staple fibers at room temperature for about 10 minutes and dried at about 40 캜 for 3 or more times to obtain a loess staple fiber.

Unit: parts by weight Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 Example 3 Styrene butadiene 80 80 80 80 80 80 butadiene 20 20 20 20 20 20 Carbon Black ⁽¹⁾ 55 55 55 55 55 55 Loose stones ⁽²⁾ - - - 5 10 15 Textile fibers and threads ⁽³⁾ - 10 - - - - Plain Textiles ⁽⁴⁾ - - 5 - - - Softeners ⁽⁵⁾ 8 8 8 8 8 8 Zinc oxide 3 3 3 3 3 3 Stearic acid One One One One One One Vulcanizing agent (sulfur) 2.8 2.8 2.8 2.8 2.8 2.8 Vulcanization accelerators ⁽⁶⁾ One One One One One One

(1) Styrene-butadiene: A styrene-butadiene rubber having a styrene content of 24 to 26% by weight and a vinyl content of butadiene of 66% by weight.

(2) Butadiene: Gossybutadiene rubber having a content of cis-1,4 butadiene of 96% by weight and a glass transition temperature (Tg) of -79 ° C.

(3) carbon black: N326, nitrogen surface area per gram (N ₂ SA) of 30 to 300 m ² / g, and DBP oil absorption of 67 to 77 cc / 100 g.

(4) Yellow loam staple fibers: Average length 3.0 mm, average diameter 15 mu m, loam content in short fibers 30 parts by weight.

(5) General fibers: Nylon fibers having an average length of 20 mm and an average diameter of 100 占 퐉.

(6) Normal staple fibers: Nylon staple fibers having an average length of 3.0 mm and an average diameter of 15 탆.

(7) Softener: A # 2 oil (trade name, Mychang Petroleum Industry)

(8) Vulcanization accelerator: stearic acid

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

Tensile properties of the rubber specimens obtained according to the above Comparative Examples and Examples, and far infrared rays and deodorization tests were measured as follows. The results are shown in Table 2 below.

1) The deodorization test was carried out according to the gas detection method.

2) Far-infrared test was compared with black body measurement using FT-TR Spectrometer.

3) The hardness was measured by DIN 53505. The hardness indicates the stability of the handling. The larger the value on the dry road surface and the wet road surface, the better the handling stability.

4) The modulus was measured according to ISO 37 standard, and the tensile strength at 300% elongation was measured.

5) The elongation was measured by a method in which the strain value was expressed in% until the specimen was broken in a tensile tester.

6) The tensile strength was measured by the method of ASTM D790, and the higher the value, the better the strength.

Property evaluation Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 Example 3 Deodorization test (Deodorization rate,%) 10 11 11 61.3 70.2 75.1 Far infrared ray test
(Emissivity: 5 to 20 mu m) 0.002 0.003 0.003 0.801 0.854 0.903 Seal
Properties Hardness 51 54 54 53 54 56 300% modulus 91 111 112 102 110 115 Elongation (%) 490 415 420 450 410 480 Tensile strength (kgf / cm2) 145 153 152 150 152 155

As can be seen from the results of the above Table 2, the rubber for tire tread according to Examples 1 to 3 of the present invention reinforced with loess staple fibers, as compared with the tire of Comparative Example 1, The contrast tensile property was improved, the far infrared ray emission amount was increased, and the deodorizing effect was improved.

Therefore, the tire manufactured using the rubber composition for tire tread including the loess short fibers stained or coated with staple fibers with the loess is excellent in physical properties, and the odor of the tire rubber can be alleviated by the deodorizing effect, And can be used as a health-friendly tire for a tire user by adjusting the humidity and improving the air quality of the room where the car is parked by emitting far-infrared rays.

Claims (7)

A rubber composition for tire treads comprising 5 to 15 parts by weight of ocher short fibers based on 100 parts by weight of raw rubber. The method of claim 1,
Wherein the loess staple fibers are stained with staple fibers. The method of claim 1,
The ocher short fiber is a rubber composition for a tire tread containing 10 to 100 parts by weight of ocher based on 100 parts by weight of short fiber. The method of claim 1,
Wherein the staple fibers are nylon staple fibers. The method of claim 1,
The short fiber has an average length of 2.0 to 5.0 mm, the average diameter of 10 to 30 ㎛ rubber composition for a tire tread. The method of claim 1,
The rubber composition may include a raw material rubber including styrene butadiene (SBR) rubber and butadiene (BR) rubber.
A tire tread having a nitrogen surface area per gram (N ₂ SA) of 30 to 300 m 2 / g and further comprising carbon black having a DBP (n-dibutyl phthalate) oil absorption of 60 to 180 cc / 100 g. Rubber composition for A tire manufactured using the rubber composition for tire tread according to any one of claims 1 to 6.