KR20130078118A - Rubber composition for tire tread and tire manufactured by using the same - Google Patents

Abstract

PURPOSE: A rubber composition for a tire thread is provided to make a high quality colored tire due to facilitating color expressioni and possible reproducibility, and an excellent reinforcement and rotating resistancy. CONSTITUTION: A rubber composition for a tire thread comprises polymer clay. The polymer clay has the average particle diameter of 1-500nm, the average particle diameter of aggregate is 10-1000nm, and nitrogen surface area per gram is 100-500m^2/g. The polymer is any selected one of the polyvinyl chloride, polyethylene terephthalate, and combination of those. The rubber composition for the tire tread includes additional crude rubber and filler.

Description

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

The present invention relates to a rubber composition for a tire tread and a tire manufactured using the same, and more particularly, to a rubber composition for a tire tread having excellent wear resistance and low fuel consumption performance, and a tire manufactured using the same.

In general, the tread rubber composition of the pneumatic tire is a blend of various rubbers, it is possible to increase the reinforcement by using carbon black and silica, respectively, or by mixing them in a constant ratio. In order to provide excellent wear resistance of the tire, a high surface area reinforcing carbon black is used. In this case, there is a problem in that the fuel efficiency is lowered, thereby improving the wear resistance and low fuel efficiency, which are opposite characteristics of the tire rubber. Development is required.

In addition, although the demand for color tires is increasing recently, it is difficult to implement color tires by carbon black used to increase the durability of the tires, and when silica is used, manufacturing processes are difficult. Therefore, there is a demand for development of high-performance color tires with improved low fuel efficiency without deterioration of durability.

KR 1020050029390 A1 KR 10069193 B1

An object of the present invention is to provide a rubber tread rubber composition excellent in both wear resistance and low fuel consumption characteristics.

In addition, another object of the present invention is to provide a tire which is manufactured from the rubber composition for tire treads and has improved wear resistance and low fuel consumption performance at the same time.

In order to achieve the above object, the rubber composition for a tire tread according to an embodiment of the present invention includes a polymer clay.

The polymer clay may have an average particle diameter of 1 to 500 nm, an average particle diameter of the aggregate of 10 to 1,000 nm, a nitrogen adsorption specific surface area of 100 to 500 m 2 / g, and the polymer may be polyvinyl chloride or polyethylene tere. It may be one selected from the group consisting of phthalate (polyethylene terephthalate) and combinations thereof.

The tire tread rubber composition may further include a raw material rubber and a filler.

The filler may be any one selected from the group consisting of carbon black, silica, and combinations thereof.

The tire composition may include 5 to 60 parts by weight of the filler, and 5 to 25 parts by weight of the polymer clay, based on 100 parts by weight of the rubber material for the tire tread.

The carbon black may have a nitrogen adsorption specific surface area (N ₂ SA) of 80 to 100 m 2 / g.

Tire according to another embodiment of the present invention is manufactured by using the rubber composition for the tread.

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

The rubber composition for tire treads according to this embodiment of the present invention includes polymer clay.

The polymer clay refers to a composite in which clay minerals having a layered structure are dispersed in a polymer matrix. When the polymer clay is classified based on the interval between clay layers, there are an intercalated structure and an exfoliated structure. The intercalated structure means that the interlayer space is increased as a result of the insertion of polymer chains into the clay interlayer space, while the intercalated structure is maintained.The exfoliated structure loses the interlayer regularity in the polymer matrix and exists as each layer. It means a structure that can not confirm the X-ray diffraction pattern is shown by the interlayer spacing regularity, in the present invention can be used without being limited to the structure of the polymer clay. When the polymer tread rubber composition is included in the tire tread, the tensile strength can be increased without reducing the toughness, thereby improving the abrasion resistance and the rotational resistance of the tire tread rubber and recycling the clay of the polymer clay. Therefore, an environmentally friendly rubber composition for tire treads can be produced.

The polymer refers to a polymer compound, for example, polyacrylonitrile, polyaniline, polypyrrole, polyimide, polystyrene, nylon, polypropylene, polypropylene , Polyethylene oxide, polycarbonate, polyethylene terephthalate, polyacrylamide, polythiophene, polydiacetylene, poly-p-phenylene vinyl Poly-p-phenylenevinylene, polybutylacrylate, polydially dimethyl ammonium chloride, poly-N-vinylcarbazole, polyethylene imine ), Polyvinylpyrrolidone, polyacrylic acid, polyphosphazene, poly-l-lact ide, polyvinyl chloride, polyvinyl pyridine, cellulose, polyethylene glycol, polyvinyl alcohol, polyethylene, rubber, elastomer (elastomer), epoxy (epoxy), polyurethane (polyurethane), unsaturated polyester (unsaturated polyester), phenolic resin (phenolic resin) or polybenzoxazine (polybenzoxazine) and the like, but is not limited thereto. The polymer may be preferably any one selected from the group consisting of polyvinyl chloride, polyethylene terephthalate, and combinations thereof, and polyvinyl chloride may be most preferably used. have.

The clay refers to fine earth particles mainly composed of silicon, aluminum and water and having a layered structure. When the clay having the layered structure is used for the polymer clay, the contact area with the polymer is widened, and the filling effect is more excellent. Examples of the clay include kaolin, palygorskite, smectite, and the like, and the kaolin may be preferably used for the rubber tread rubber composition.

The kaolin is a white hexagonal plate-like structure consisting of a tetrahedral sheet (tetrahedral sheet, Si-O) and an octahedral sheet (Al-O) ratio of 1: 1, and kaolinite, kaolin, and white peach. It is also called Toe or Goryeong.

The palygorskite or attapulgite is a clay composed of hydrated magnesium silicate (tetrahedral sheet (Si-O) and octahedral sheet (octahedral sheet, Al-O) ratio of 2: A substantial amount of aluminum in the 1-octahedral plate is replaced by magnesium or iron, and has a moderate surface charge.

The smectite-based clay is generally called bentonite and means that most of the rock components are smectite. The structure of smectite consists of a 2: 1 ratio of tetrahedral sheets (Si-O) and octahedral sheets (Al-O), and alumina (silica) is present on tetrahedral plates. Is partially substituted with iron and magnesium is partially substituted with aluminum present in an octahedral sheet. Examples of the smectite include nontronite, saponite, bedellite, and montmorillonite.

The polymer clay may have an average particle diameter of 1 to 500 nm, an average particle diameter of the aggregate of 10 to 1,000 nm, and a nitrogen surface area per gram (N ₂ SA) of 100 to 500 m 2 / g. Preferably, the average particle diameter is 20 to 100 nm, the average particle diameter of the aggregate is 50 to 1,000 nm, the nitrogen surface area per gram (N ₂ SA) is 120 to 300 m 2 / g, more preferably Preferably, the average particle diameter is 30 to 40 nm, the aggregate has an average particle diameter of 100 to 1,000 nm, and a nitrogen surface area per gram (N ₂ SA) may be 150 to 200 m 2 / g. When the average particle diameter of the polymer clay is less than 1 nm, the particles are too small to be processed, and when it exceeds 500 nm, the physical properties of the aggregates adversely affect the tire properties due to the binding force of the strong powder residue. In addition, when the average particle diameter of the polymer clay aggregate is less than 10 nm, the workability is not preferable, and when the average particle diameter exceeds 1,000 nm, the bonding force is too strong, which is detrimental to the physical properties of the tire. In addition, when the nitrogen adsorption specific surface area of the polymer clay is less than 100 m 2 / g, the workability of the tire is lowered, and when it exceeds 500 m 2 / g, the dispersing force of the polymer clay is poor, leading to a deterioration in the properties of the tire rubber, which is not preferable.

The polymer clay may be a surface modified.

The surface modification means changing the chemical structure or the physical structure of the particle surface, wherein the polymer clay is all or part of the substituents of the polymer or the silica (si) or aluminum (Al) of the clay and a halogen atom, a hydroxyl group, a carboxyl group. , Cyano group, nitro group, amino group, thio group, methyl thio group, alkoxy group, nitrile group, aldehyde group, epoxy group, ether group, ester group, ester group, carbonyl group, acetal group, ketone group, alkyl group, cycloalkyl group, hetero It may be replaced with any one selected from the group consisting of a cycloalkyl group, benzyl group, aryl group, heteroaryl group, pofluoroalkali group, derivatives thereof and combinations thereof.

When the rubber composition for the tire tread includes the polymer clay, the elastic force of the tire tread rubber is increased, so that the rotational resistance is excellent, and thus the low fuel consumption performance is improved, and the clay has a recyclability and can be used as an environmentally friendly material. It is easy to add color to the polymer clay, so that the rubber composition can be applied to make color tires. The tire tread rubber composition may include the polymer clay in an amount of 5 to 25 parts by weight, and preferably 10 to 20 parts by weight based on 100 parts by weight of the raw material rubber. If the content of the polymer clay is less than 5 parts by weight, the effect of including the polymer clay is insignificant, and if it exceeds 25 parts by weight, the physical properties of the tire rubber, such as excessively high modulus due to the excessive addition of the polymer clay may be lowered.

The tire tread rubber composition may further include a raw material rubber and a filler.

The raw material rubber may be any one selected from the group consisting of natural rubber, synthetic rubber, and combinations thereof, preferably natural rubber.

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.

The filler may be any one selected from the group consisting of carbon black, silica, and combinations thereof, and carbon black may be preferably used in that the filler may improve wear resistance of the tire.

The carbon black may have a nitrogen surface area per gram (N ₂ SA) of 60 to 200 m 2 / g, preferably 70 to 110 m 2 / g or 120 to 150 m 2 / g. It is possible to use, most preferably 80 to 100 m 2 / g. In addition, the carbon black may have a DBP (n-dibutyl phthalate) oil absorption of 80 to 150 cc / 100g, preferably 90 to 120 cc / 100g, but the present invention is not limited thereto.

When the nitrogen adsorption specific surface area of the carbon black exceeds 200 m 2 / g, the workability of the rubber composition for a tire may be detrimental, and when less than 60 m 2 / g, reinforcing performance by the carbon black filler may be detrimental. In particular, when the carbon adsorption of the nitrogen adsorption specific surface area of 80 to 100 m 2 / g is more excellent in the elasticity and rolling resistance of the tire rubber. In addition, when the DBP oil absorption amount of the carbon black is less than 80 cc / 100g, the reinforcement of the tire rubber may be lowered, and if it exceeds 150 cc / 100g, the processability of the tire rubber composition 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 has a nitrogen adsorption specific surface area (N ₂ SA) of 50 to 500 m 2 / g and a CTAB (cetyl trimethyl ammonium bromide) adsorption specific surface area of 50 to 500 M 2 / g, but the present invention is not limited thereto.

When the nitrogen adsorption specific surface area of the silica is less than 50 m 2 / g, reinforcing performance by silica as a filler may be detrimental, and when it exceeds 500 m 2 / g, the workability of the rubber composition may be detrimental. In addition, when the CTAB adsorption specific surface area of the silica is less than 50 m 2 / g, reinforcing performance by the filler silica may be disadvantageous, and when it exceeds 500 m 2 / g, the workability of the rubber composition may be disadvantageous.

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 filler may be included in 5 to 60 parts by weight based on 100 parts by weight of the raw material rubber, preferably 10 to 40 parts by weight. When the content of the filler is less than 5 parts by weight, it is disadvantageous to reinforcement of the tire rubber, and when it exceeds 60 parts by weight, wear performance may be reduced.

According to one embodiment of the invention, the rubber composition for the tire tread may further include one or more compounding agents selected from the group consisting of vulcanizing agents, vulcanization accelerators, softeners, anti-aging agents and adhesives.

As the vulcanizing agent, metal oxides such as sulfur vulcanizing agents, organic peroxides, resin vulcanizing agents, and magnesium oxide can be used.

The sulfur-based vulcanizing agents include inorganic vulcanizing agents such as powdered sulfur (S), insoluble sulfur (S), precipitated sulfur (S) and colloidal sulfur, tetramethylthiuram disulfide (TMTD) and tetraethyl. Organic vulcanizing agents such as tetraethyltriuram disulfide (TETD) and dithiodimorpholine can be used. 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.

The organic peroxide may be benzoyl peroxide, dicumyl peroxide, di-t-butyl peroxide, t-butyl cumyl peroxide, methyl ethyl ketone peroxide, cumene hydroperoxide, 2,5-dimethyl-2,5-di ( t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 1,3- Bis (t-butylperoxypropyl) benzene, di-t-butylperoxy-diisopropylbenzene, t-butylperoxybenzene, 2,4-dichlorobenzoyl peroxide, 1,1-dibutylperoxy-3 Any one selected from the group consisting of, 3,5-trimethylsiloxane, n-butyl-4,4-di-t-butylperoxyvalerate and combinations thereof can be used.

It is preferable that the vulcanizing agent is included in an amount of 0.5 to 5.0 parts by weight based on 100 parts by weight of the raw material rubber from the viewpoint that the raw rubber is less sensitive to heat and chemically stable.

The vulcanization accelerator means an accelerator that promotes the rate of vulcanization or promotes delay in the initial vulcanization stage.

The vulcanization accelerators include sulfenamide, thiazole, thiuram, thiourea, guanidine, dithiocarbamic acid, aldehyde-amine, aldehyde-ammonia, imidazoline, xanthate and their Any one selected from the group consisting of combinations may be used, and sulfenamide-based may be preferably 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 Sulfenamide-based compounds may be used, and N-tert-butyl-2-benzothiazylsulfenamide (TBBS) can be preferably 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 0.1 to 10 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 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 10 parts by weight based on 100 parts by weight of the raw material rubber, respectively, in order to serve as a proper vulcanization accelerating auxiliary.

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 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, with the recent increase in environmental awareness, when the content of the polycyclic aromatic hydrocarbons (Polycyclic Aromatic Hydrocarbons (hereinafter referred to as 'PAHs') contained in the aromatic oil is more than 3% by weight, it is known that cancer is likely to cause, Treated distillate aromatic extract (TDAE) oil, mild extraction solvate (MES) oil, residual aromatic extract (RAE) oil or heavy naphthenic oil can be preferably used.

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

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

The plant oils include castor oil, cottonseed oil, linseed oil, canola oil, soybean oil, palm oil, palm oil, peanut oil, pine oil, pine tar, tall oil, corn oil, rice bran oil, safflower oil, sesame oil, olive oil, sunflower oil, palm kernel oil, camellia oil It may be used any one selected from the group consisting of jojoba oil, macadamia nut oil, saflower flower oil, tung oil and combinations thereof.

It is preferable that the softening agent is used in an amount of 1 to 50 parts by weight based on 100 parts by weight of the raw material rubber in order to improve the workability 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.

In addition to the anti-aging action, the anti-aging agent should have a high solubility in rubber, low volatility, inert to rubber, and should 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 and the p-tert-alkylphenol formaldehyde resin may be a p-tert-butyl-phenol formaldehyde resin, p-tert- And a combination thereof.

The pressure-sensitive adhesive may be included in an amount of 0.5 to 10 parts by weight based on 100 parts by weight of the raw material rubber. If the amount of the pressure-sensitive adhesive is less than 0.5 parts by weight based on 100 parts by weight of the raw material rubber, the adhesion performance is poor. If the amount is more than 10 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 tire treads according to an embodiment of the present invention includes polymer clay, which increases elastic force and rotational resistance, and is recyclable, which can be used as an environment-friendly material. Tires can be manufactured.

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.

Compounding agent (unit: weight part) Example 1 Example 2 Example 3 Comparative Example 1 Natural rubber 100 100 100 100 Carbon Black A ¹⁾ 50 30 - 50 Carbon Black B ²⁾ - - 30 - Polymer clay ^{3 )} 10 20 20 - Zinc oxide 4 4 4 4 Stearic acid 2.5 2.5 2.5 2.5 Antioxidant ^{4 )} 1.5 1.5 1.5 1.5 brimstone 1.5 1.5 1.5 1.5 Curing accelerator ^{5 )} 1.0 1.0 1.0 1.0

1) Carbon Black A: Nitrogen adsorption specific surface area of 130 to 140 m 2 / g, DBP oil absorption of 100 to 120 cc / 100 g

2) Carbon Black B: Nitrogen adsorption specific surface area of 80-100 m 2 / g, DBP oil absorption 90-110 cc / 100 g

3) Polymer clay: average particle diameter of 30 to 40 nm, aggregate average particle diameter of 100 to 1,000 nm, nitrogen adsorption specific surface area of 150 to 200 m 2 / g

4) Anti-aging Agent: N-1,3-dimethylbuthyl-N-phenyl-p-phenylenediamine

5) vulcanization accelerator: N-tert-butylbenzothiazole-2-sulfenamide

[ Test Example : Evaluation of physical properties of rubber]

The rubber composition was blended using a half-barrier mixer to prepare a rubber sheet, and the vulcanized physical properties of the modulus and the viscoelasticity were measured by vulcanization for 30 minutes in an unvulcanized physical property and a 150 ° C. vulcanization press. The measuring method is as follows, and the result is as shown in following Table 2.

1) Melt Viscosity and Scorch Stability were measured on MV2000.

2) The hardness of the manufactured rubber specimens was measured after 1 hour standing in a temperature-controlled combustion chamber by ASTM shore-A hardness test method.

3) The 300% modulus uses a 100mm long, 25mm wide and 5mm wide dumbbell. As a method of stress, the elongation at break indicates the strain value in% until the specimen breaks in the tensile tester. The tensile strength is tested according to ASTM D790.

4) tanδ RDS was measured using Rheo dynamic spectroscopy, and was calculated by the formula of tanδ = (G ″ / G ′), where G ′ is Viscous Modulus and G ″ is an ElasticModulus value.

Properties Example 1 Example 2 Example 3 Comparative Example 1 Uncured Property Mooney viscosity (125 ° C) 96 94 90 84 Scotch Stability (min) 36.6 38.4 38.2 40.2 Vulcanization
Properties Hardness 73 67 69 70 300% modulus (kgf / ㎠) 213 196 190 203 Elongation at Break (%) 380 420 448 402 Tensile strength (kgf / cm2) 280 292 295 285 Tan∂ (60 ℃) 0.130 0.120 0.118 0.138

As shown in the results of Table 2, in the case of the tire tread rubber containing a polymer clay, it was confirmed that the overall tensile strength is excellent and the rotation resistance performance is excellent but the hardness is not lowered. Particularly, when carbon black having a nitrogen adsorption specific surface area of 80 to 100 m 2 / g together with polymer clay was used, it was confirmed that tensile properties and rotational resistance were excellent. It can be seen that it is possible to provide a tire having both excellent rolling resistance and rolling resistance.

Claims (8)

A rubber composition for tire treads comprising polymer clay. The method of claim 1,
The polymer clay has an average particle diameter of 1 to 500 nm, an average particle diameter of the aggregate of 10 to 1,000 nm, a nitrogen adsorption specific surface area of 100 to 500 m 2 / g, the rubber composition for tire treads. The method of claim 1,
The polymer is any one selected from the group consisting of polyvinyl chloride, polyethylene terephthalate, and combinations thereof. The method of claim 1,
The tire tread rubber composition further comprises a raw material rubber and a filler. 5. The method of claim 4,
The filler is any one selected from the group consisting of carbon black, silica, and combinations thereof. The method of claim 5,
The carbon black has a nitrogen adsorption specific surface area (Ntrogen surface area per gram, N ₂ SA) is 80 to 100 m 2 / g rubber composition for tire tread. 5. The method of claim 4,
The tire tread rubber composition comprises 5 to 60 parts by weight of the filler based on 100 parts by weight of the raw material rubber,
5 to 25 parts by weight of the polymer clay rubber composition for a tire tread. A tire using the tire tread rubber composition according to any one of claims 1 to 7.