KR20200021131A - 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 having improved abrasion performance and rolling resistance at the same time; and a tire manufactured by using the same. Specifically, a rubber composition for a tire tread according to the present invention comprises: 100 parts by weight of raw rubber; 3 to 20 parts by weight of soybean oil; 1 to 10 parts by weight of a pure-monomer-based resin having 8 to 10 carbon atoms; and 50 to 60 parts by weight of carbon black.

Description

RUBBER COMPOSITION FOR TIRE TREAD AND TIRE MANUFACTURED BY USING THE SAME

The present invention relates to a rubber composition for tire treads having improved wear performance and rolling resistance at the same time, and a tire manufactured using the same.

Tires use various kinds of additives to improve or reinforce the physical properties required for the tire, in addition to the rubber component, which is the main material.

Among these additives, process oil is used to improve the mixing load when mixing rubber and various additives. Process oil is used as a softener to reduce the mixing energy loss required in the formulation of tire rubber compositions and to improve the dispersion and compatibility between rubber and rubber, rubber, chemicals and fillers used in the rubber composition. Used. In addition, process oil is used to improve grip strength, wear resistance, and cutting resistance performance of the rubber tread rubber composition on wet roads.

As the process oil, oils derived from petroleum have mainly used highly aromatic substances such as DAE (distillate aromatic extracts) oil. However, when the content of polycyclic aromatic hydrocarbons (hereinafter referred to as "PAHs") contained in these aromatic oils is 3% by weight or more, it is known to cause cancer, and polycyclic aromatic oils (Poly Cyclic Aromatic) As it is known that oil (PCA oil) components may be released into the atmosphere together with dust when tire wear occurs, the effort to replace the DAE oil with a non-aromatic type oil continues.

To solve this problem, MES (medium extracted solvates) or TDAE (treated distillate aromatic extracts) characterized in that the polyaromatic content is very low as a non-aromatic oil. Although it has been used, it has not been applied to the process oil to completely remove the PAHs, which is a hazardous substance, and also has a problem that the process oil with a lower aromatic component is lower than the conventional rubber compound properties, efficiency, and economics.

In addition, the replacement of DAE aromatic oils with MES or TDAE oils in the rubber composition for tire treads leads to a decrease in the wear resistance and the cutting resistance of the tire treads, and is particularly vulnerable to the chipping problem of the tire treads. There is a problem.

In order to solve this problem, in an effort to replace a part of the oil with another specific softener, an oil extracted from an orange peel was applied to a rubber composition for a tire, but in the case of the orange oil, a complex process of extracting and purifying from the peel Due to the fact that it is poor in terms of profitability, and other oils are expensive, it is urgent to develop alternative materials.

It is an object of the present invention to provide a rubber composition for tire treads with improved wear performance and rolling resistance at the same time.

Another object of the present invention is to provide a rubber composition for an eco-friendly tire tread from which the toxic substances PAHs (Polycyclic Aromatic Hydrocarbons) are completely removed.

Still another object of the present invention is to provide a truck-bus tire manufactured using the rubber tread rubber composition.

In order to solve the above problems, the present invention provides a tire comprising 100 parts by weight of raw material rubber, 3 to 20 parts by weight of soybean oil, 1 to 10 parts by weight of 8 to 10 carbon-based pure-monomer resins, and 50 to 60 parts by weight of carbon black. Provide a rubber composition.

The soybean oil may include 40 to 60% by weight of linoleic acid, 10 to 30% by weight of oleic acid, and the balance of fatty acids other than the two based on the total weight of the soybean oil.

The pure C-monomer resin having 8 to 10 carbon atoms is vinyltoluene resin (Vinyltoluenes), dicyclopentadiene resin (Dicyclopentadiene), indene resin (Indene), methyl styrene resin (Methylstyrene), styrene resin (Styrene), methyl Indene resin (Methyl indenes) and may be any one selected from the group consisting of a combination thereof.

The rubber composition for tire tread is 1.5 to 2.5 parts by weight of vulcanizing agent, 0.5 to 2.5 parts by weight of vulcanization accelerator, 1 to 5 parts by weight of zinc oxide, 0.5 to 3 parts by weight of stearic acid and anti-aging agent based on 100 parts by weight of the raw material rubber. It may be to include more 1 to 10 parts by weight.

The present invention also provides a tire manufactured using the rubber composition for tire tread.

The present invention can improve the wear performance and rolling resistance at the same time, it is possible to provide a rubber composition for an eco-friendly tire tread is completely removed from the toxic substances PAHs (Polycyclic Aromatic Hydrocarbons).

The present invention can also provide a truck-bus tire manufactured using the rubber tread rubber composition.

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

The rubber composition for tire treads according to the present invention includes 100 parts by weight of raw rubber, 3 to 20 parts by weight of soybean oil, 1 to 10 parts by weight of 8 to 10 carbon-based pure-monomer resins, and 50 to 60 parts by weight of carbon black.

In the rubber composition for tire treads, the raw rubber may be any one selected from the group consisting of natural rubber, synthetic rubber, and combinations thereof.

The natural rubber has excellent tensile strength and friction resistance, and can be used without particular limitation as long as it is generally used in tire rubber compositions. Specifically, the natural rubber may be general natural rubber or modified natural rubber.

The natural rubber contains cis-1,4-polyisoprene as a main agent, but may also include trans-1,4-polyisoprene depending on the required properties. Therefore, the natural rubber includes, in addition to the natural rubber containing cis-1,4-polyisoprene as a main agent, for example, a natural containing trans-1,4-isoprene as a main agent such as a balata, which is a kind of rubber of South American sapotagua. Rubber may also be included.

Moreover, the said modified natural rubber means what modified | denatured or refined the said general natural rubber. For example, the modified natural rubber may include deproteinized natural rubber (DPNR), hydrogenated natural rubber, and the like.

In addition, the synthetic rubber is styrene butadiene rubber (SBR), modified styrene butadiene rubber, butadiene rubber (BR), modified butadiene rubber, polyisoprene rubber, butyl rubber (BR), chloro sulfonated polyethylene rubber, epichlorohydrin rubber, Fluorine rubber, silicone rubber, nitrile rubber, hydrogenated nitrile rubber, nitrile butadiene rubber (NBR), modified nitrile butadiene rubber, cloned 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, bromomethyl styrene butyl rubber, maleic acid styrene butadiene rubber, carboxylic acid styrene butadiene rubber, epoxy Isoprene Rubber, Maleic Acid Ethylene Propylene High It may be a p-methyl styrene (brominated polyisobutyl isoprene-co-paramethyl styrene, BIMS), and one selected from the group consisting of -, carboxylic acid nitrile-butadiene rubber, polyisobutylene isoprene bromo mineyi lactide-co.

Among these, butyl rubber may be more preferable because it has low gas permeability, shows excellent crack resistance and adhesion, and in particular, air permeability is superior to other rubbers.

The butyl rubber is a copolymer of isobutylene and isoprene, also referred to as isobutylene-isoprene rubber. Specifically, the butyl rubber is butyl rubber (IIR); Or halogenated butyl rubber such as brominated butyl rubber (Br-IIR) or chlorinated butyl rubber (Cl-IIR), and the like, and butyl rubber may be more preferred.

The present invention may further add soybean oil to give plasticity to rubber to facilitate processing and to improve tire wear performance. Soybean oil, which is a natural oil, has a higher molecular weight and contains unsaturated fatty acids compared to general TDAE (Treated Distillate Aromatic Extract) process oil. The greater the number of double bonds of these unsaturated fatty acids, the greater the plasticization effect, which can be said to be advantageous for compound dispersion even in small amounts. However, when the same amount is used to replace the same amount, it is preferable to use soybean oil within 20 parts by weight with respect to 100 parts by weight of the raw material rubber because the stiffness of the rubber composition may be rather reduced due to excessive mixing.

Specifically, the soybean oil may include 40 to 60% by weight of linoleic acid, 10 to 30% by weight of oleic acid, and the balance of fatty acids other than the two based on the total weight of the soybean oil.

When the ratio of the oleic acid is less than 10% by weight, the braking performance and the abrasion resistance on the snow surface are excellent, but the trade-off problem of the braking performance and the rolling resistance on the wet road surface is large, and when it exceeds 30% by weight, On the contrary, the trade-offs of braking performance and rolling resistance on wet roads are insignificant, but the effects of braking and abrasion resistance on snowy roads are also negligible.

The soybean oil may have a specific gravity of 0.90 to 0.93, an iodine value of 124 to 139 g / 100g, and a saponification value of 188 to 195 mgKOH / g.

The soybean oil may have a weight average molecular weight of 850 to 900 g / mol. The soybean oil may provide an environmentally friendly tire with a total content of PAHs of 3% by weight or less and a kinematic viscosity of 95 or more (210 ° F. SUS) based on the whole oil, and the rubber tread rubber composition including the soybean oil has a low temperature. In addition to excellent properties and fuel efficiency, PAHs also have favorable properties for environmental factors such as cancer.

The soybean oil may be to extract an oil component using a soybean compression method or a solvent extraction method.

First, the compression method may be prepared by a washing step, a drying step, a milking step, a aging step, and a precipitation step. The drying step may be to wash for 2 to 3 hours by washing the selected soybeans by inhalation ventilation drying method with a low heat of 50 to 70 ℃ degree. The milking step may be to extract the oil from the dried soybean with a conventional presser or Xperer machine between 80 to 90 ℃. In the aging and precipitation step, the oil extracted through the milking process may be aged at room temperature for 7 to 10 days, and at the same time, the foreign matter may be precipitated to remove the precipitate to separate only the clear oil.

Next, the solvent extraction method may be to use an organic solvent such as hexane, alcohol, acetone, benzene, chloromethane, ether. Soybean may be immersed in the organic solvent to extract the oil component and to separate only the oil.

The present invention is characterized in that it further comprises a pure carbon-based resin having 8 to 10 carbon atoms in order to improve the rolling resistance performance of the tire, and to prevent a trade-off phenomenon occurring when soybean oil is added.

The pure-monomer resin may have 8 to 10 carbon atoms, and most preferably, C9-based pure-monomer carbon atoms having 9 carbon atoms.

In addition, the C8-C10 pure-monomer-based resin additionally improves the tack performance between the rubber and the rubber, and improves the physical properties of the rubber by improving the mixing, dispersibility and processability of other additives such as fillers. It can serve as an adhesive contributing to improvement.

The 8 to 10 carbon-based pure-monomer resin is specifically vinyltoluene resin (Vinyltoluenes), dicyclopentadiene resin (Dicyclopentadiene), indene resin (Indene), methyl styrene resin (Methylstyrene), styrene resin (Styrene) , Methyl indenes (Methyl indenes) and may be an aromatic resin having 8 to 10 carbon atoms selected from the group consisting of these.

The following chemical formulas each represent a monomer of a pure-monomer resin having 8 to 10 carbon atoms, wherein Formula 1 is a vinyltoluene resin, Formula 2 is dicyclopentadiene, Formula 3 is indene, Formula 4 is methylstyrene, and Formula 5 is styrene Lene, formula 6, represents methylindene.

<Formula 1>

<Formula 2>

<Formula 3>

<Formula 4>

<Formula 5>

<Formula 6>

The 8 to 10 carbon-based pure-monomer resin may be included in an amount of 1 to 10 parts by weight based on 100 parts by weight of the raw material rubber. When the content of the pressure-sensitive adhesive is less than 1 part by weight based on 100 parts by weight of the raw material rubber, tire wear resistance may be detrimental, and when it exceeds 10 parts by weight, rolling resistance properties may be lowered.

The tire tread portion is a thick rubber layer that is in direct contact with the road surface, and uses abrasion resistant rubber that is resistant to impact to protect the carcass, the belt layer, and the like that are inside the tire. The tire tread rubber composition includes process oil for processing and dispersing the material. However, existing process oils contain a large amount of polycyclic aromatic hydrocarbons (PAHs), which are toxic substances causing cancer, and have a problem of low compounding properties and efficiency.

On the other hand, when the process oil is replaced with soybean oil, which is a natural oil, to improve processability and dispersibility, wear resistance is improved, but rolling resistance is deteriorated.

In the present invention, in order to solve the above problems it may be to use a mixture of soybean oil, which is a natural oil and a pure-monomer resin having 8 to 10 carbon atoms. The rubber composition for tire treads comprising the soybean oil and the C8-C10 pure-monomer-based resin can improve the processability and dispersibility of the material, thereby minimizing the force applied to the rubber composition device, and making the manufacturing process smooth. have. In addition, there is an advantage that can improve the wear resistance and rolling resistance properties, which are physical properties of the rubber composition, and secure a price competitiveness.

The present invention may also further comprise carbon black as a reinforcing agent.

The carbon black may have a nitrogen adsorption specific surface area (N2SA) of 30 to 300 m 2 / g and a DBP (n-dibutyl phthalate) oil absorption of 60 to 180 cc / 100 g, but the present invention It is not limited to this.

When 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 detrimental, and when less than 30 m 2 / g, reinforcing performance by the carbon black filler may be detrimental. In addition, when the DBP oil absorption of the carbon black exceeds 180 cc / 100g, the workability of the rubber composition may be lowered. If the DBP oil absorption of the carbon black is less than 60 cc / 100g, the reinforcing performance of the carbon black as a filler may be disadvantageous.

Representative examples of the carbon black are N110, N121, N134, N220, N231, N234, N242, N293, N299, S315, N326, N330, N332, N339, N343, N347, N351, N358, N375, N539, N550, N582 , N630, N642, N650, N683, N754, N762, N765, N774, N787, N907, N908, N990 or N991.

The carbon black may be included in an amount of 50 to 60 parts by weight based on 100 parts by weight of the raw material rubber. When the content of the carbon black is less than 50 parts by weight, the reinforcing performance by the carbon black as a filler may be reduced, and when the content is more than 60 parts by weight, the processability of the rubber composition may be deteriorated.

The tire tread rubber composition may optionally further include various additives such as additional vulcanizing agents, vulcanization accelerators, vulcanization accelerators, anti-aging agents and the like. The various additives can be used as long as it is commonly used in the field of the present invention, the content thereof is not particularly limited, depending on the compounding ratio used in the conventional tire tread rubber composition.

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

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

The vulcanizing agent is preferably included in an amount of 1.5 to 2.5 parts by weight based on 100 parts by weight of the raw material rubber, in that the raw material rubber is less sensitive to heat and chemically stable.

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

The vulcanization accelerators include sulfenamides, thiazoles, thiurams, thioureas, guanidines, dithiocarbamic acids, aldehydes-amines, aldehydes-ammonias, imidazolines, xanthates and the like. Any one selected from the group consisting of a combination can be used.

Examples of the sulfenamide-based 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 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.

The thiourea-based vulcanization accelerator, for example, thiacarbamide, diethylthiourea, dibutylthiourea, trimethylthiourea, diorthotolylthiourea, and any one selected from the group consisting of a combination thereof 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.

Examples of the aldehyde-amine-based or aldehyde-ammonia-based vulcanization accelerators include aldehyde selected from the group consisting of acetaldehyde-aniline reactants, butylaldehyde-aniline condensates, hexamethylenetetramine, acetaldehyde-ammonia reactants, 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 2.5 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, and may be any one selected from the group consisting of inorganic vulcanization accelerators, organic vulcanization accelerators, and combinations thereof. .

The inorganic vulcanization accelerator may be any one selected from the group consisting of zinc oxide (ZnO), zinc carbonate, magnesium oxide (MgO), lead oxide, potassium hydroxide, and combinations thereof. 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.

In particular, the zinc oxide and the stearic acid may be used together as the vulcanization accelerator, in which case the zinc oxide is dissolved in the stearic acid to form an effective complex with the vulcanization accelerator, thereby releasing advantageous sulfur during the vulcanization reaction. It facilitates the crosslinking reaction of the rubber.

When using the zinc oxide and the stearic acid together may be used in 1 to 5 parts by weight and 0.5 to 3 parts by weight with respect to 100 parts by weight of the raw material rubber, respectively, to serve as a suitable vulcanization accelerator. When the content of zinc oxide and the stearic acid is less than the above range, the vulcanization rate may be low, and productivity may be lowered. When the zinc oxide and the stearic acid are below the above range, a scorch phenomenon may occur and the physical properties may be reduced.

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 amine-based, phenol-based, quinoline-based, imidazole-based, carbamic acid metal salts, waxes, and combinations thereof may be appropriately selected.

Examples of the amine antioxidant include N-phenyl-N '-(1,3-dimethyl) -p-phenylenediamine, N- (1,3-dimethylbutyl) -N'-phenyl-p-phenylenediamine, N-phenyl-N'-isopropyl-p-phenylenediamine, N, N'-diphenyl-p-phenylenediamine, N, N'-diaryl-p-phenylenediamine, N-phenyl-N ' Any one selected from the group consisting of -cyclohexyl p-phenylenediamine, N-phenyl-N'-octyl-p-phenylenediamine, and combinations thereof can be used. Examples of the phenolic anti-aging agent include phenolic 2,2'-methylene-bis (4-methyl-6-tert-butylphenol), 2,2'-isobutylidene-bis (4,6-dimethylphenol) and 2 Any one selected from the group consisting of, 6-di-t-butyl-p-cresol and combinations thereof can be used. As the quinoline-based antioxidant, 2,2,4-trimethyl-1,2-dihydroquinoline and its derivatives may be used, and specifically 6-ethoxy-2,2,4-trimethyl-1,2-di Consisting of hydroquinoline, 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. Wax hydrocarbons may be preferably used as the wax.

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 tire tread rubber composition may be prepared 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. (called “non-production” step) and the crosslinking system are mixed, Typically produced in a suitable mixer using a second step (called a "production" step) of mechanical treatment at low temperatures of less than 110 ° C., for example 40-100 ° C., but the 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. The 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 used in the manufacture of tires in the related art, and thus detailed description thereof will be omitted.

The tires are most preferred as truck-bus tires because of excellent wear resistance and rolling resistance, and are used for passenger car tires, racing tires, airplane tires, agricultural machinery tires, off-the-road tires, truck tires, or the like. Bus tires and the like. The tire may also be used as a radial tire or a bias tire.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

Preparation Example: Preparation of Rubber Composition

A rubber composition for tire treads according to the following examples and comparative examples was prepared using the composition shown in Table 1 below. The preparation of the rubber composition was in accordance with a conventional method for producing a rubber composition.

Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 Raw material rubber (1) 80 80 80 80 80 Raw Material Rubber (2) 20 20 20 20 20 Carbon black (3) 60 60 60 60 60 Process Oil (4) 10 0 0 0 0 Natural Oils (5) 0 5 10 5 5 Resin 1 (6) 0 0 0 5 0 Resin 2 (7) 0 0 0 0 5 Zinc oxide 3 3 3 3 3 Stearic acid 2 2 2 2 2 brimstone 1.5 1.5 1.5 1.5 1.5 Accelerators (8) One One One One One Retardant 0.3 0.3 0.3 0.3 0.3

(1) natural rubber

(2) Synthetic rubber: Butadiene rubber using Gosis neodymium catalyst (97%)

(3) Carbon black: Carbon black with iodine adsorption value of 140 mg / g and OAN oil absorption of 125 cc / 100 g

(4) Process oil: TDAE (Treated Distiallate Aromatic Extract) oil

(5) Natural oil: Soybean oil containing 7% by weight of linoleic acid, 22.6% by weight of oleic acid and the balance of other fatty acids.

(6) Resin 1: Pure-monomer resin having 9 carbon atoms (Indene resin)

(7) resin 2: pure-monomer resin having 9 carbon atoms (vinyl toluene resin)

(8) Accelerator: CBS (N-cyclohexyl-2-benzothiazylsulfenamide)

Experimental Example: Measurement of Physical Properties of Prepared Rubber Composition

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

Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 Mooney viscosity 76 75 76 76 76 Tmax 32 31 31 30 30 Shore A 71 71 70 70 71 300% modulus 179 174 170 166 168 Elongation (%) 425 381 433 442 436 Rolling resistance (Index) 100 95 93 98 99 Wear Resistance (Index) 100 105 115 115 112

(1) Mooney viscosity (ML1 + 4 (100 degreeC)) was measured by ASTM specification D1646. Mooney viscosity is a value which represents the viscosity of an unvulcanized rubber, and it shows that it is excellent in workability of an unvulcanized rubber, so that a numerical value is low.

(2) Tmax was measured by MDR measuring equipment. The Tmax value represents the highest point of the vulcanization curve of the rubber. The Tmax value and the entire curve can be used to identify the revision and marching phenomenon.

(3) The hardness (Shore A) was measured by DIN 53505. Hardness represents adjustment stability, and the higher the value, the better the adjustment stability.

(4) 300% Modulus was measured by ISO 37 standard. 300% modulus indicates that the higher the value, the better the tensile property.

(5) The elongation rate means the elongation at break, and the method of expressing the strain value in% until the test piece is cut in the tensile tester was measured. The higher the elongation rate, the better the tensile properties.

(6) The rolling resistance was measured by using a DMTS measuring instrument (Dynamic mechanical thermal spectrometry; GABO, EPLEXOR 500N) and measured tan δ under 0.5% strain condition at 60 ° C. and 10 Hz frequency and then indexed based on Comparative Example 1. The rolling resistance is tanδ measured at 60˚. The lower the rolling resistance, the lower the physical resistance.

(7) The abrasion resistance index is expressed by using a rambon abrasion tester as an index based on Comparative Example 1. The higher the wear resistance index, the better the wear performance.

Referring to Table 2, Comparative Examples 2 and 3 using soybean oil instead of process oil showed a slight decrease in Tmax and tensile properties compared to Comparative Example 1 containing 10 parts by weight of process oil. When the process oil is replaced with natural oil, it was confirmed that the deterioration of physical properties occurred. In addition, in Comparative Example 3, it was confirmed that the excellent wear resistance was improved, but it was confirmed that the trade-off phenomenon in which the rolling resistance value was decreased compared to the conventional one.

On the contrary, in Examples 1 and 2 in which the process oil was replaced with a mixture of soybean oil and 8 to 10 carbon-based pure-monomer resins, equivalent rolling resistance indexes were confirmed along with improved wear resistance. This suggests that the wear resistance can be secured while preventing the rolling resistance characteristics that are reduced when the whole amount of oil is replaced.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (5)

100 parts by weight of raw rubber,
3 to 20 parts by weight of soybean oil,
1 to 10 parts by weight of the pure-monomer resin having 8 to 10 carbon atoms, and
50 to 60 parts by weight of carbon black
Rubber composition for a tire comprising a. The method of claim 1,
The soybean oil is a rubber composition for tire treads comprising 40 to 60% by weight of linoleic acid, 10 to 30% by weight of oleic acid and the remainder of fatty acids other than the two soybean oil. The method of claim 1,
The pure C-monomer resin having 8 to 10 carbon atoms is vinyltoluene resin (Vinyltoluenes), dicyclopentadiene resin (Dicyclopentadiene), indene resin (Indene), methyl styrene resin (Methylstyrene), styrene resin (Styrene), methyl Rubber composition for a tire tread which is any one selected from the group consisting of indenes (Methyl indenes) and combinations thereof. The method of claim 1,
The tire tread rubber composition is based on 100 parts by weight of the raw material rubber, 1.5 to 2.5 parts by weight of vulcanizing agent, 0.5 to 2.5 parts by weight of vulcanization accelerator, 1 to 5 parts by weight of zinc oxide, 0.5 to 3 parts by weight of stearic acid and anti-aging agent The rubber composition for a tire tread further comprising 1 to 10 parts by weight. A tire manufactured using the rubber composition for tire tread according to any one of claims 1 to 4.