KR20140022311A - Rubber composition for tire tread and tire manufactured by using thesame - Google Patents

Abstract

The present invention relates to a rubber composition for a tire tread and a tire manufactured using the same. The tire tread rubber composition according to the present invention comprises 100 parts by weight of crude rubber and 5-40 parts by weight of cellulosic nanofibers. The tire tread rubber composition is able to maximize the abrasion resistance of a tire with excellent mechanical properties by exceeding the limit of the abrasion resistance improvement degree of the tire according to the use of general fillers and is able to entirely improve the physical properties of the tire.

Description

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

The present invention relates to a rubber composition for a tire tread and a tire produced using the same. More particularly, the present invention relates to a rubber composition for a tire tread, which improves not only the abrasion resistance of the tire tread but also the physical properties of the tire, The present invention relates to a tire manufactured by the method.

Performance requirements for tires vary widely, and the required performance of tires varies somewhat from tire to tire.

It is difficult to adjust the rolling resistance, the abrasion resistance and the wet tackiness of the tire tread properties at the same time. That is, when a physical property is improved, a phenomenon that other physical properties are deteriorated exists between these three physical properties, and adjustment of these three physical properties is an important issue in tire manufacturing technology.

The abrasion of the tire is a phenomenon that the surface of the tread rubber contacting with the ground is worn out due to the frictional force generated between the tread and the road surface of the tire. The abrasion of the tire greatly affects the life and braking performance of the tire, In terms of economy, the tire tread should have excellent abrasion resistance.

Among the raw materials used in the rubber composition for a tire tread, polymers and reinforcing agents are used as the most important raw materials that determine the physical properties of tires. This reinforcing agent has a filling effect at the same time, and can be roughly divided into silica, which is an inorganic filler, and carbon black, which is an organic filler. The stronger the bond between the reinforcing agent and the polymer is, the better the physical properties are, and the tire functions. In addition to the method of increasing the content of the filler, there is a method of controlling the composition ratio of the tire tread rubber composition, using a filler having a good reinforcing property, and reducing the content of the process aid.

However, when the content of the filler is increased to improve the abrasion resistance, heat generation may become worse, or problems may arise in the manufacture of the tire process, and the tire may not be comfortable to ride.

According to the related literature, Patent Document 1 (10-2010-0041401 A) uses neodymium butadiene rubber to improve abrasion resistance and resistance to ignition. However, according to the invention disclosed in Patent Document 1, wear resistance is improved in a certain range, and there is a limit to maximizing abrasion resistance.

Patent Document 2 discloses that a natural rubber, which is a 100% diene rubber, is improved in abrasion resistance by using raw rubber and carbon black containing 30% by weight or less of butadiene rubber. However, according to the invention disclosed in Patent Document 2, there is a problem that the degree of improvement in wear resistance is small.

KR 1020100041401 A KR 1020000001556 A

It is an object of the present invention to provide a rubber composition for a tire tread that maximizes the abrasion resistance of the tire and improves the physical properties of the tire in general with a superior mechanical property beyond the limit of improvement in abrasion resistance upon use of a filler.

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

In order to attain the above object, the rubber composition for tire tread according to one embodiment of the present invention comprises 100 parts by weight of raw rubber and 5 to 40 parts by weight of nanocellulose fiber.

The rubber composition for a tire tread may have an average diameter of the nanocellulose fibers of 5 to 100 nm.

The rubber composition for a tire tread may be such that the formulation of the nanocellulose fiber is a powder.

The rubber composition for a tire tread may have a coefficient of linear expansion of less than 1 ppm / K of the nanocellulose fiber.

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

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

The rubber composition for tire tread according to one embodiment of the present invention comprises 100 parts by weight of raw rubber and 5 to 40 parts by weight of nanocellulose fiber.

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

The natural rubber may be a general natural rubber or a modified natural rubber.

The above-mentioned general natural rubber may be used as long as it is known as natural rubber, and the country of origin and the like are not limited. The natural rubber includes cis-1,4-polyisoprene as a main component, but may also include trans-1,4-polyisoprene depending on required characteristics. Therefore, in addition to natural rubber containing cis-1,4-polyisoprene as a main component, natural rubber including trans-1,4-isoprene as a main component, such as balata, Rubber may also be included.

The modified natural rubber means that the general natural rubber is modified or purified. 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 nanocellulose fibers are meant to include all of the cellulosic fibers having a diameter of less than 1000 nm.

Generally, wood is an organic complex composed of three main components of cellulose, hemicellulose and lignin. Among these, cellulose is a biopolymer composed of a long chain of glucose having unique structural characteristics, also called fibrin (fiber). The cellulose is found in the cell wall of a plant and corresponds to a kind of skeleton that plays a role of supporting the plant. The cellulose is extremely strong in tension and can undergo chemical deformation in a variety of ways, so its properties also change accordingly.

The nanocellulose fiber can be obtained by separating from wood pulp or the like. Since the nanocellulose fiber has a very large surface area as compared with general cellulose fibers, a stronger physico-chemical reaction with the raw rubber occurs, thereby maximizing the reinforcing effect of the tire tread portion and improving the mechanical properties of the tire have.

The nanocellulose fiber refers to a cellulosic fiber having an average diameter of less than 1000 nm. The nanocellulose can be prepared by preparing cellulose as a suspension and intensely stirring at high pressure.

Since the nanocellulose fibers have a larger specific surface area than the general cellulose fibers and have a relatively large contact area between the nanofiber particles, they form a three-dimensional network by forming a large amount of hydrogen bonds between the fibers. Therefore, not only the bondability with the raw material rubber is greatly improved, but also the reinforcement effect of the tire can be doubled even in a small amount.

The nanocellulose fiber may be contained in an amount of 5 to 44 parts by weight, preferably 8 to 42 parts by weight, based on 100 parts by weight of the raw rubber. If it is contained in an amount of less than 5 parts by weight, the reinforcement effect of the tire is hardly obtained. If the amount of the nano-cellulose is more than 44 parts by weight, the nano-cellulose which does not bond with the raw rubber tends to aggregate and act as an impurity, to be.

The rubber composition for a tire tread may have an average diameter of the nanocellulose fibers of 5 to 100 nm, preferably 10 to 70 nm, more preferably 18 to 62 nm, and most preferably 18 to 42 nm . When the average diameter of the nanocellulose fibers falls within the above range, the reinforcing effect on the raw rubber is most excellent. When the diameter is less than 5 nm, the nanocellulose does not form a three-dimensional network having excellent bonding strength with the raw rubber, and when the diameter exceeds 100 nm, the contact area between the nanofibers is relatively narrow.

The rubber composition for a tire tread may be such that the formulation of the nanocellulose fiber is a powder.

Examples of one embodiment for obtaining the nanocellulose fiber in powder form include treating the cellulose fiber with an aqueous electrolyte-containing solution in which amphoteric carboxymethylcellulose is at a pH of 1.5 to 4.5 and the electrolyte has a cation at a concentration of 0.0001 to 0.5M , Adjusting the pH after the treatment step to 5 to 13, and pulverizing the cellulose with the adjusted pH.

When general cellulose is dried in a suspension state, a mass is formed due to bonding between the cellulose, and the mechanical strength of the cellulose is rapidly lowered. Further, the cellulose in which the suspension is dried has a problem in that the mass acts as a foreign substance in the tire tread part composition to lower the reinforcing property of the tire. However, since the nanocellulose having the powdery formulations does not entangle with each other, the mechanical strength is maintained as it is, and not only the workability is excellent, but also the reinforcement effect of the tire can be doubled by the excellent bonding force with the raw rubber.

The rubber composition for a tire tread may have a coefficient of linear expansion of less than 1 ppm / K of the nanocellulose fiber.

When the coefficient of linear expansion exceeds 1 ppm / K, the nanocellulose fibers contained in the tire may expand or shrink as the temperature of the tire changes during traveling, thereby causing cracks in the tire or lowering the reinforcing effect .

The rubber composition for a tire tread may further include various additives such as additional vulcanizing agents, vulcanization accelerators, vulcanization accelerators, anti-aging agents, softening agents and the like. The various additives can be used as long as they are commonly used in the field to which the present invention belongs. The content thereof is not particularly limited as long as it depends on a compounding ratio used in a rubber composition for a tire tread.

As the vulcanizing agent, a sulfur vulcanizing agent can be preferably used. The sulfur vulcanizing agent may be an inorganic vulcanizing agent such as powdered sulfur (S), insoluble sulfur (S), precipitated sulfur (S), or colloid sulfur. As the sulfur vulcanizing agent, a vulcanizing agent which produces elemental sulfur or sulfur, for example, amine disulfide, polymer sulfur and the like can be used.

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

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

Examples of the vulcanization accelerator include sulfenamide, thiazole, thiuram, thiourea, guanidine, dithiocarbamate, aldehyde-amine, aldehyde-ammonia, imidazoline, Or a combination thereof.

Examples of the sulfenamide type vulcanization accelerator include N-cyclohexyl-2-benzothiazyl sulfenamide (CBS), N-tert-butyl-2-benzothiazyl sulfenamide (TBBS), N, N-dicyclohexyl -2-benzothiazyl sulfenamide, N-oxydiethylene-2-benzothiazyl sulfenamide, N, N-diisopropyl-2-benzothiazole sulfenamide, and combinations thereof Based compound can be used.

Examples of the thiol-based vulcanization accelerator include 2-mercaptobenzothiazole (MBT), dibenzothiazyl disulfide (MBTS), sodium salt of 2-mercaptobenzothiazole, zinc salt of 2-mercaptobenzothiazole , A copper salt of 2-mercaptobenzothiazole, a cyclohexylamine salt of 2-mercaptobenzothiazole, 2- (2,4-dinitrophenyl) mercaptobenzothiazole, 2- Ethyl 4-morpholinothio) benzothiazole, and combinations thereof. The thiazole-based compound may be used alone or in combination of two or more thereof.

Examples of the thiuram-based vulcanization accelerator include tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide, tetramethylthiuram monosulfide, dipentamethylthiuram disulfide, dipentamethylthiuram monosulfide, dipentamethylene Any one of thiuram-based compounds selected from the group consisting of thiuram tetrasulfide, dipentamethylenethiuram hexasulfide, tetrabutylthiuram disulfide, pentamethylenethiuram tetrasulfide, and combinations thereof can be used.

Examples of the thiourea vulcanization accelerator include thiourea compounds selected from the group consisting of thiacarbamide, diethyl thiourea, dibutyl thiourea, trimethyl thiourea, diorthotolyl thiourea, and combinations thereof. Compounds may be used.

Examples of the guanidine-based vulcanization accelerator include guanidine-based compounds selected from the group consisting of diphenyl guanidine, diorthotolyl guanidine, triphenyl guanidine, orthotolyl biguanide, diphenyl guanidine phthalate, and combinations thereof .

Examples of the 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 type or aldehyde-ammonia type vulcanization accelerator include aldehyde selected from the group consisting of acetaldehyde-aniline reactant, butylaldehyde-aniline condensate, hexamethylenetetramine, acetaldehyde-ammonia reactant, -Amine-based or aldehyde-ammonia-based compounds may be used.

As the imidazoline-based vulcanization accelerator, for example, an imidazoline-based compound such as 2-mercaptoimidazoline can be used. Examples of the xanthate vulcanization accelerator include xanthates such as zinc dibutylxanthogenate Compounds may be used.

The vulcanization accelerator may be included in an amount of 0.5 to 4.0 parts by weight based on 100 parts by weight of the raw material rubber in order to maximize productivity improvement and rubber property enhancement through vulcanization speed promotion.

The vulcanization accelerating assistant may be any one selected from the group consisting of an inorganic vulcanization accelerator aid, an organic vulcanization accelerator aid, and a combination thereof, which is used in combination with the vulcanization accelerator to complete the promoting effect thereof .

As the inorganic vulcanization accelerating aid, any one selected from the group consisting of zinc oxide (ZnO), zinc carbonate, magnesium oxide (MgO), lead oxide, potassium hydroxide and combinations thereof may be used have. As the organic vulcanization accelerating auxiliary, there may be selected from the group consisting of stearic acid, zinc stearate, palmitic acid, linoleic acid, oleic acid, lauric acid, dibutyl ammonium oleate, derivatives thereof, Can be used.

In particular, the zinc oxide and the stearic acid may be used together as the vulcanization accelerating assistant. In this case, the zinc oxide is dissolved in the stearic acid to form an effective complex with the vulcanization accelerator, Thereby facilitating the crosslinking reaction of the rubber.

When the zinc oxide and the stearic acid are used together, they may be used in an amount of 1 to 5 parts by weight and 0.5 to 3 parts by weight, respectively, based on 100 parts by weight of the raw rubber to serve as a proper vulcanization accelerator. If the content of the zinc oxide and the stearic acid is less than the above range, the vulcanization rate may be slow and the productivity may be deteriorated. If the content exceeds the above range, the scorch phenomenon may occur and the physical properties may be deteriorated.

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

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

If the nitrogen adsorption specific surface area of the carbon black exceeds 300 m ² / g, the workability of the rubber composition for a tire may be deteriorated. If it is less than 30 m ² / g, the reinforcing performance by carbon black as a filler may be deteriorated. If the DBP oil absorption of the carbon black exceeds 180 cc / 100 g, the workability of the rubber composition may be deteriorated. If it is less than 60 cc / 100 g, the reinforcing performance by carbon black as a filler may be deteriorated.

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

The carbon black may be included in an amount of 30 to 80 parts by weight based on 100 parts by weight of the raw material rubber, preferably 45 to 65 parts by weight, and more preferably 53 to 57 parts by weight. When the content of the carbon black is less than 30 parts by weight, the reinforcing performance by the carbon black as a filler may decrease, and when the content of the carbon black exceeds 80 parts by weight, the processability of the rubber composition may be deteriorated.

The softening agent is added to the rubber composition in order to impart plasticity to the rubber to facilitate processing or to decrease the hardness of the vulcanized rubber, and means an oil or other material used in rubber compounding or rubber production. The softening agent means an oil contained in a process oil or other rubber composition. The softener may be selected from the group consisting of petroleum oils, vegetable oils, and combinations thereof, but the present invention is not limited thereto.

The petroleum-based oil may be selected from the group consisting of paraffinic oil, naphthenic oil, aromatic oil, and combinations thereof.

Examples of the paraffin oil include P-1, P-2, P-3, P-4, P-5 and P-6 of Mychang Oil Co., N-1, N-2 and N-3 of Kokai Co., Ltd., and representative examples of the aromatic oils include A-2 and A-3 of Mingchang Oil Co.,

However, recently, when the content of the polycyclic aromatic hydrocarbons (hereinafter referred to as PAHs) contained in the aromatic oil is higher than 3 wt% together with the increase of the environmental consciousness, treated distillate aromatic extract oil, mild extraction solvate (MES) oil, residual aromatic extract (RAE) oil or heavy naphthenic oil.

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

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

Examples of the vegetable oils include vegetable oils such as castor oil, cottonseed oil, linseed oil, canola oil, soybean oil, palm oil, palm oil, peanut oil, pine oil, pine tar, tall oil, cone oil, rice bran oil, safflower oil, sesame oil, , Jojoba oil, macadamia nut oil, four flower oil, tung oil, and combinations thereof.

It is preferable that the softening agent is used in an amount of 1 to 150 parts by weight based on 100 parts by weight of the raw material rubber in order to improve the workability of the raw rubber.

The antioxidant is an additive used to stop the chain reaction in which the tire is autoxidized by oxygen. As the anti-aging agent, any one selected from the group consisting of an amine type, a phenol type, a quinoline type, an imidazole type, a carbamic acid metal salt, a wax and a combination thereof can be appropriately selected and used.

Examples of the amine type antioxidant include N-phenyl-N '- (1,3-dimethyl) -p-phenylenediamine, N- (1,3-dimethylbutyl) -N'- Phenyl-N'-isopropyl-p-phenylenediamine, N, N'-diphenyl-p-phenylenediamine, -Cyclohexyl p-phenylenediamine, N-phenyl-N'-octyl-p-phenylenediamine, and combinations thereof. Examples of the phenolic antioxidant include phenol-based 2,2'-methylene-bis (4-methyl-6-tert-butylphenol), 2,2'- isobutylidene- Di-t-butyl-p-cresol, and combinations thereof. As the quinoline antioxidant, 2,2,4-trimethyl-1,2-dihydroquinoline and its derivatives can be used. Specifically, 6-ethoxy-2,2,4-trimethyl- Dihydroquinoline, 6-anilino-2,2,4-trimethyl-1,2-dihydroquinoline, 6-dodecyl-2,2,4-trimethyl-1,2-dihydroquinoline and combinations thereof Any one selected from the group can be used. As the wax, waxy hydrocarbons can be preferably used.

Considering the conditions that the solubility of the antioxidant in addition to the anti-aging action is high, the solubility in the rubber is small, the volatility is small, the solubility should be inactive to the rubber, and the vulcanization should not be inhibited, By weight.

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

The tires may be automobile tires, racing tires, airplane tires, agricultural tires, off-the-road tires, truck tires or bus tires. Further, the tire may be a radial tire or a bias tire, and preferably a radial tire.

When the tire tread rubber composition according to the present invention is used, the abrasion resistance of the tire can be maximized, and the physical properties of the tire can be generally improved, by exceeding the limit of the degree of improvement of the wear resistance of the tire due to the use of a general filler.

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

[ Manufacturing example : Preparation of rubber composition]

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

Item Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Raw rubber 100 100 100 100 100 100 100 100 100 100 Carbon black 55 55 55 55 55 55 55 55 55 55 Fiber 1 - 10 - - - - - - - - Fiber 2 - - 4 45 5 10 15 40 - - Fiber 3 - - - - - - - - 10 - Fiber 4 - - - - - - - - - 10 Process oil 8 8 8 8 8 8 8 8 8 8 Zinc oxide 3 3 3 3 3 3 3 3 3 3 Stearic acid One One One One One One One One One One brimstone 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 2.8 Vulcanization accelerator One One One One One One One One One One

Fiber 1: General cellulose fiber, Contec SNC, Ultra fiber 500.

Fiber 2: nanocellulose fiber 1, average diameter 20 to 40 nm, powder form.

Fiber 3: Nanocellulose fiber 2, average diameter 20 to 60 nm, powder form.

Fiber 4: Nano-cellulose fiber 3, an aqueous suspension of nanocellulose having an average diameter of 20 to 40 nm, dried as it is.

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

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

The hardness was measured by DIN 53505

The 300% modulus is the tensile strength at 300% elongation measured according to the ISO 37 standard, and the higher the value, the better the strength.

The tensile strength was measured by the method of ASTM D 790, and the higher the value, the better the strength.

The abrasion resistance was measured by estimating the loss of abraded rubber by rotating at a room temperature of 50% slip ratio and a load of 1.5 Kg. The larger the index, the better the abrasion resistance.

The degree of dispersion was measured according to the method of representing the degree of dispersion of the stiffener in a certain area of the vulcanized rubber based on 100% dispersion by the Image Analyzer analysis method. The values obtained by indexing the measurement results indicate that the larger the index, the better the dispersion.

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Tensile properties Hardness 70 72 73 75 72 74 76 76 74 73 300% modulus 110 120 130 151 131 140 147 149 135 138 Elongation (%) 410 430 440 420 450 468 472 478 465 464 The tensile strength
(kgf / cm ² ) 152 155 162 177 165 170 173 180 168 167 Abrasion resistance index 85 100 107 118 108 111 115 120 109 110 Dispersivity (%) 88 87 88 85 88 90 95 95 88 85

As shown in the above Table 2, it can be confirmed that when the nanofibers are contained (Examples 1 to 6) in comparison with the ordinary fibers (Comparative Example 2), the nanofibers are generally excellent in 300% modulus, Was contained in the form of a powder in the form of a suspension (Example 6), it was confirmed that the phenomenon of entanglement was reduced and the dispersibility, hardness and abrasion resistance were excellent. This is because the reinforcing effect is increased because the reinforcing material is uniformly dispersed in the tire rubber composition and the bonding force with the raw rubber is improved.

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 right.

Claims (5)

100 parts by weight of raw rubber, and
5 to 40 parts by weight of nano cellulose fibers
≪ / RTI > The method of claim 1,
Wherein the average diameter of the nanocellulose fibers is 5 to 100 nm. The method of claim 1,
The rubber composition for tire tread, wherein the formulation of the nano cellulose fibers is a powder. The method of claim 1,
Wherein the nanocellulose fiber has a coefficient of linear expansion of less than 1 ppm / K. A tire manufactured using the rubber composition for tire tread according to any one of claims 1 to 4.