KR20110073058A - Tread rubber composition for truck tire using on road and off-road, and truck tire manufactured by using the same - Google Patents

Abstract

PURPOSE: A tread rubber composition for truck tire is provided to improve abrasion resistance and durability and to ensure excellent chipping resistance and cutting resistance while not using a coupling agent. CONSTITUTION: A tread rubber composition for truck tire comprises 100 parts by weight of a base rubber, 30-60 parts by weight of carbon black, 5-25 parts by weight of silica, 2-8 parts by weight of a phenol-free novolac resin as a reinforcing resin, and 2-6 parts by weight of a methylene donating material. The sum of carbon black and silica is 65 parts by weight or less. The base rubber includes 10-30 parts by weight of a styrene butadiene rubber and 70-90 parts by weight of a natural rubber.

Description

Tread rubber compound for tire and rough road truck tire tread rubber composition and tires manufactured using the same, and tires manufactured using the same. (TREAD RUBBER COMPOSITION FOR TRUCK TIRE USING ON ROAD AND OFF-ROAD, AND TRUCK TIRE MANUFACTURED BY USING THE SAME)

The present invention relates to a truck tire tread rubber composition and a tire manufactured using the same for both road and rough roads, and the physical properties of other rubbers while improving the abrasion resistance and durability required for the old road and the chipping resistance and cutting resistance required for the rough road. The present invention relates to a tire tread rubber composition and a tire manufactured by using the same for both old and bad roads.

In the case of a dual-use road and a rough road truck tire, durability and abrasion resistance are required in consideration of the use in the road, and at the same time, cutting resistance and chipping resistance are also required in consideration of the use in the road. Therefore, in general, as a raw material rubber, natural rubber having excellent low heat generation performance and tearing performance is used, and a method of applying silica and a reinforcing resin to increase the tear strength of rubber is used.

However, in this case, in order to increase the insufficient durability, the carbon black should be lowered while using carbon black having a large particle size and a developed structure. However, when such carbon black is used, wear resistance is deteriorated. In order to improve the wear resistance, the use of carbon black having a small particle size and excellent reinforcement performance should be increased to the optimum content. At this time, the heat generation of the tire is increased due to friction between the carbon blacks, resulting in poor heat resistance and durability. Will be lost.

In addition, when silica and a reinforcing resin are used in order to increase cutting resistance and chipping resistance, there is a disadvantage in that the modulus of the rubber is lowered to lower the wear resistance. In order to compensate for this, a coupling agent may be used together. In this case, the hardness of the rubber is increased due to the bonding between the silica and the coupling agent, thereby improving durability and abrasion resistance, but the chipping resistance is deteriorated.

As such, rubber compositions mixed with various additives have limited performance with each other according to the use of each composition, so that both trucks and rough road trucks can satisfy both chipping resistance and cutting resistance while maintaining wear resistance and durability. The composition ratio of the rubber composition for tire tread is very difficult.

Application No. 10-2003-0014084 discloses 1 to 1 maleic unhydride polybutadiene rubber reacted by adding 5 to 20 parts by weight of silica to 100 parts by weight of raw rubber and adding polybutadiene resin to maleic unhydride. A tread rubber composition of truck and bus tires is disclosed as containing 5 parts by weight.

It is common to use a coupling agent at the same time as using silica to improve the tear resistance, but when the coupling agent is not used while using silica or an excessive amount of a reinforcing resin is used, the modulus of the rubber is reduced and thus the wear resistance Deterioration and deterioration of durability occur. Therefore, there is a limit to improving the tear resistance without degrading other performances, and to provide a tread rubber composition of a truck tire of a good performance and a rough road, a technique for overcoming this is required.

It is an object of the present invention to improve the abrasion resistance and durability required for nursing homes without the use of a coupling agent, and to improve the chipping resistance and cutting resistance required for the rough roads, and to reduce the physical properties of other rubbers. It is to provide a tread rubber composition.

It is another object of the present invention to provide an aged and rough road truck tire manufactured using the tread rubber composition.

In order to achieve the above object, the tire tread rubber composition for both aged and rough road truck according to an embodiment of the present invention comprises 10 to 30 parts by weight of styrene butadiene rubber (SBR) and 70 to 90 parts by weight of natural rubber (NR) 100 parts by weight of raw material rubber, 30 to 60 parts by weight of carbon black (CB), 5 to 25 parts by weight of silica, 2 to 8 parts by weight of phenol-free novolak resin, which is a reinforcing resin, and 2 to 6 parts by weight of methylene donor, The sum of the contents of the carbon black and the silica is 65 parts by weight or less.

The styrene butadiene rubber may be a vinyl content of butadiene 20 to 50% by weight and a styrene content of 30 to 50% by weight.

The carbon black may have a nitrogen adsorption specific surface area of 138 to 144 mg / g, a DBP (n-dibutyl phthalate) oil absorption amount of 129 to 141 cc / 100 g, and a tint (TINT) value of 113 to 125%.

The silica may have a BET surface area of 163 to 173 m ² / g, a CTAB (cetyl trimethyl ammonium bromide) adsorption specific surface area of 152 to 162 m ² / g, and a DBP oil absorption of 187 to 197 ml / 100 g.

The phenol free novolak resin may have a softening point of 105 to 120 ° C. and a pre-phenol content of less than 1.0 wt%.

The methylene donor is any one selected from the group consisting of hexamethoxymethylmelamine, hexamethylenetetramine, 2-nitro-2-methyl propanol, and combinations thereof It may be

It is another object of the present invention to provide a dividing line and a rough road truck tire manufactured using the tire tread rubber composition for the dividing line and the rough road truck.

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

The tire tread rubber composition for dual-use and rough road trucks includes raw material rubber, carbon black, silica, reinforcing resin, and methylene donor.

The raw rubber includes 10 to 30 parts by weight of styrene butadiene rubber (SBR) and 70 to 90 parts by weight of natural rubber (NR).

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

The general natural rubber may be used as long as it is known as a natural rubber, the country of origin and the like are not limited. The natural rubber contains cis-1,4-polyisoprene as the main, but may also comprise trans-1,4-polyisoprene depending on the required properties. Accordingly, the natural rubber includes, in addition to natural rubber containing cis-1,4-polyisoprene as a main agent, for example, natural containing trans-1,4-isoprene as a main agent such as balata, which is a kind of rubber of South American sapotaceae. Rubber may also be included. The modified natural rubber means a modified or refined general natural rubber. For example, the modified natural rubber may include epoxidized natural rubber (ENR), deproteinized natural rubber (DPNR), hydrogenated natural rubber, and the like.

Preferably, the natural rubber may be high linearity natural rubber. By using the high linearity natural rubber there is an advantage to increase the durability and heat resistance of the tire through the reduction of the rubber cysteresis.

The styrene butadiene rubber (SBR) may be an emulsion-polymerized styrene butadiene rubber (E-SBR), a solution-polymerized styrene butadiene rubber (S-SBR), and a combination thereof. . The styrene butadiene rubber may be produced continuously or may be produced batchwise. In addition, it may or may not contain oil.

When the styrene butadiene rubber is used, styrene butadiene rubber having high friction energy and high hysteresis may be used to prevent cutting of tire treads by sharp stones in the rough road.

The styrene butadiene rubber may have a styrene content of 30 to 50 wt% and a vinyl content of butadiene at 20 to 50 wt%. When the styrene content is 30 to 50% by weight, and the styrene butadiene rubber having 20 to 50% by weight of vinyl contained in butadiene, the styrene content is high, and thus the braking performance may be greatly improved.

In addition, the raw material rubber may be composed of 10 to 30 parts by weight of styrene butadiene rubber and 70 to 90 parts by weight of natural rubber. When the styrene butadiene rubber is used in less than 10 parts by weight, it is difficult to expect the improvement of the braking performance and the adjustment stability performance, when used in excess of 30 parts by weight may reduce the durability performance. In addition, when the content of the natural rubber is in the above range can be effectively improved the durability of the tire tread rubber composition for the combine and rough road truck.

The carbon black may be a carbon black having a colloidal feature to improve chipping resistance, cutting resistance, and abrasion resistance.

The carbon black may have a nitrogen adsorption specific surface area (N ₂ SA, nitrogen surface area per gram) of 138 to 144 m ² / g. When N ₂ SA of the carbon black exceeds 144m ² / g, there is an advantageous surface for the reinforcement of cutting resistance and chipping performance, but the processability of the rubber composition for tires may be detrimental, and the carbon filler is less than 138m ² / g. Reinforcement by black may fall.

The carbon black may have a DBP (n-dibutyl phthalate) oil absorption amount of 129 to 141 cc / 100 g. If the DBP oil absorption of the carbon black exceeds 141cc / 100g, the workability of the tread rubber composition may be lowered. If the DBP oil absorption of the carbon black is less than 129cc / 100g, the reinforcing performance of the carbon black as a filler may be detrimental.

The carbon black may have a tint (TINT) of 113 to 125%. When the tint value of the carbon black is within the above range, the dispersion degree of the carbon black may be improved, thereby improving the reinforcement of the tire tread rubber composition for the dual-use and rough road truck.

The carbon black may be included in 30 to 60 parts by weight based on 100 parts by weight of the raw material rubber, preferably the carbon black may be included in 40 to 50 parts by weight based on 100 parts by weight of the raw material rubber. When the content of the carbon black is less than 30 parts by weight based on 100 parts by weight of the raw material rubber, the wear resistance may be reduced, and when the content of the carbon black exceeds 60 parts by weight, the heat resistance may be reduced.

The silica may have a BET surface area of 163 to 173 m ² / g, a CTAB (cetyl trimethyl ammonium bromide) adsorption specific surface area of 152 to 162 m ² / g, and a DBP oil absorption of 187 to 197 ml / 100 g. When the BET surface area, CTAB adsorption specific surface area and DBP oil absorption amount of the silica is less than the above range, the reinforcing performance by silica as a filler may be detrimental. The processability of the rubber composition can be disadvantageous.

The silica may be included in 5 to 25 parts by weight based on 100 parts by weight of the raw material rubber, preferably 10 to 20 parts by weight. When the content of the silica is less than 5 parts by weight based on 100 parts by weight of the raw material rubber, the cutting resistance and chipping resistance may be lowered. When the content of the silica exceeds 25 parts by weight, the hysteresis of the rubber may be increased, thereby reducing durability and heat resistance. Can be.

The sum of the contents of the carbon black and the silica is preferably 65 parts by weight or less, more preferably 1 to 60 parts by weight, based on 100 parts by weight of the raw material rubber. The tire tread rubber composition for both the aged and the rough road trucks has a coupling agent generally used in the case of using silica by adding the carbon black and the silica content to 65 parts by weight or less based on 100 parts by weight of the raw material rubber. It can improve durability and abrasion resistance, preventing the chipping resistance fall without using.

That is, the tire tread rubber composition for both the aged and the rough road trucks does not use a coupling agent commonly used when it contains silica. Thereby, the fall of the chipping resistance which arises by using a coupling agent is prevented.

As the reinforcing resin, a novolak resin, which is a waste-lough resin, may be used. The novolak resin means that phenols are reacted with an aldehyde under an acid catalyst. Examples of the phenols include phenol, cresol, and resorcinol, and examples of the aldehydes include formaldehyde, paraformaldehyde, benzaldehyde, and the like. The acid catalyst is oxalic acid, hydrochloric acid, sulfuric acid, and p. Toluenesulfonic acid and the like can be exemplified, but the present invention is not limited thereto.

The novolac resin may be unmodified or may be modified by oil. In the case of a novolak resin modified by oil, for example, the modified by cashew nut oil, but the present invention is not limited thereto.

As said reinforcing resin, phenol free novolak resin can be used preferably. Phenol free novolak resin refers to a phenol-formaldehyde novolak resin having a low prephenol content by removing residual phenols of the novolak resin.

The phenol free novolak resin may have a prephenol content of less than 1.0% by weight, and a softening point of 105 to 120 ° C. When the phenol free novolak resin has a prephenol content of less than 1.0% by weight and a softening point of 105 to 120 ° C., the dispersibility of silica is sufficient even when silica is used as a reinforcing filler and a coupling agent is not used. The improvement can improve the durability and wear resistance of the rubber composition.

The methylene donor means that it can react with the reinforcing resin to form a network. The methylene donor may be hexamethylenetetramine, hexaethoxymethylmelamine, hexamethoxymethylmelamine, lauryloxymethylpyridinium chloride, oxymethylpyridinium chloride, trioxane hexamethoxymethylmelamine, 2-nitro-2- Any one selected from the group consisting of methylpropanol and combinations thereof can be used. Preferably the methylene donor is selected from the group consisting of hexamethoxymethylmelamine, hexamethylenetetramine, 2-nitro-2-methyl propanol, and combinations thereof Either one can be used.

The phenol-free novolak resin as the reinforcing resin may be used in an amount of 2 to 8 parts by weight based on 100 parts by weight of the raw material rubber, and the methylene donor may be used in an amount of 2 to 6 parts by weight based on 100 parts by weight of the raw material rubber.

When the reinforcing resin and the methylene donor are used in an amount less than 2 parts by weight, sufficient chipping resistance and an improvement in cutting resistance cannot be obtained. The reinforcing resin is used in an amount of more than 8 parts by weight, and the methylene donor In the case of using more than 6 parts by weight, workability may decrease.

When the styrene butadiene rubber is used as the raw material rubber and a reinforcing resin and a methylene donor are used together, the hardness of the rubber is increased due to the reaction between the reinforcing resin and the methylene donor, thereby improving chipping and cutting resistance. At the same time, the tires can be improved by reducing block deformation of the tread and reducing heat generation.

The tire composition for tire treads for both elderly and rough road trucks may optionally further include various additives such as additional vulcanizing agents, vulcanization accelerators, vulcanization accelerators, anti-aging agents and softeners. 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), tetra Organic vulcanizing agents, such as ethylethyluram disulfide (TEET) and dithiodimorpholine, can be used. Specifically, as the sulfur vulcanizing agent, a vulcanizing agent which produces elemental sulfur or sulfur, for example, amine disulfide, polymer sulfur, or the like can be used.

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.

As the vulcanizing agent, sulfur corresponding to powdered sulfur and insoluble sulfur may be preferably used. The vulcanizing agent is preferably included in an amount of 0.5 to 3.5 parts by weight with respect to 100 parts by weight of the raw rubber, in that the raw 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.

Examples of the vulcanization accelerator include sulfenamide, thiazole, thiuram, thiourea, old anidine, dithiocarbamic acid, aldehyde-amine, aldehyde-ammonia, imidazoline, xanthate and these Any one selected from the group consisting of can be used.

Examples of the sulfenamide vulcanization accelerators include N-cyclohexyl-2-benzothiazylsulfenamide (CBS), N-tert-butyl-2-benzothiazylsulfenamide (TBBS), and N, N-dicyclohexyl. Any selected from the group consisting of -2-benzothiazylsulfenamide, N-oxydiethylene-2-benzothiazylsulfenamide, N, N-diisopropyl-2-benzothiazolesulfenamide and combinations thereof The sulfenamide type compound of can be used.

Examples of the thiazole vulcanization accelerators include 2-mercaptobenzothiazole (MBT), dibenzothiazyl disulfide (MBTS), sodium salt of 2-mercaptobenzothiazole, and zinc salt of 2-mercaptobenzothiazole. , Copper salt of 2-mercaptobenzothiazole, cyclohexylamine salt of 2-mercaptobenzothiazole, 2- (2,4-dinitrophenyl) mercaptobenzothiazole, 2- (2,6-di Any thiazole compound selected from the group consisting of ethyl 4-morpholinothio) benzothiazole and combinations thereof can be used.

Examples of the thiuram-based vulcanization accelerators include tetramethyl thiuram disulfide (TMTD), tetraethyl thiuram disulfide, tetramethyl thiuram monosulfide, dipentamethylene thiuram disulfide, dipentamethylene thiuram monosulfide and dipentamethylene. Any thiuram-based compound selected from the group consisting of thiuram tetrasulfide, dipentamethylene thiuram hexasulfide, tetrabutyl thiuram disulfide, pentamethylene thiuram tetrasulfide, and combinations thereof can be used.

As the thiourea vulcanization accelerator, for example, thiocarbamide, diethylthiourea, dibutylthiourea, trimethylthiourea, diorthotolylthiourea, and any combination thereof is selected from the group of thiourea Compounds can be used.

As the guanidine-based vulcanization accelerator, for example, any one guanidine-based compound selected from the group consisting of diphenylguanidine, diorthotolylguanidine, triphenylguanidine, orthotolylbiguanide, diphenylguanidine phthalate, and combinations thereof can be used. Can be.

Examples of the dithiocarbamic acid-based vulcanization accelerators include ethylphenyldithiocarbamate zinc, butylphenyldithiocarbamate zinc, sodium dimethyldithiocarbamate, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, Zinc dibutyldithiocarbamate, zinc diamyldithiocarbamate, zinc dipropyldithiocarbamate, zinc salt of pentamethylenedithiocarbamate and piperidine, hexadecylisopropyldithiocarbamate zinc, octadecyl Isopropyldithiocarbamate zinc dibenzyldithiocarbamate zinc, sodium diethyldithiocarbamate, pentamethylenedithiocarbamate piperidine, dimethyldithiocarbamate selenium, diethyldithiocarbamate tellurium, dia One dithiocarbamic acid compound selected from the group consisting of cadmium didicarbamate and combinations thereof can be used.

The aldehyde-amine-based or aldehyde-ammonia-based vulcanization accelerators include, for example, an 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 5.0 parts by weight with respect to 100 parts by weight of the raw rubber in order to maximize productivity and rubber properties by promoting the vulcanization rate.

The vulcanization accelerator is a compounding agent used in combination with the vulcanization accelerator to complete its promoting effect. Any one selected from the group consisting of inorganic vulcanization accelerators, organic vulcanization accelerators and combinations thereof can be used. .

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 one.

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 rubber, respectively, to serve as a suitable vulcanization accelerator.

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, it is known that cancer is more likely to occur when the content of polycyclic aromatic hydrocarbons (hereinafter referred to as "PAHs") included in the aromatic oils is 3% by weight or more with the recent increase of environmental awareness. , TDAE (treated distillate aromatic extract) oil, mild extraction solvate (MES) oil, residual aromatic extract (RAE) oil or heavy naphthenic oil can be preferably used.

In particular, the oil used as the softener has a total content of PAHs component of 3% by weight or less, a kinematic viscosity of 95 ° C or more (210 ° F SUS), 15-25% by weight of an aromatic component in the softener, and a naphthene-based oil. TDAE oils with 27 to 37% by weight and 38 to 58% by weight of paraffinic components can be preferably used.

The TDAE oil is advantageous in terms of environmental factors such as the low temperature characteristics of the tire tread including the TDAE oil, fuel efficiency, and the likelihood of causing cancer of PAHs.

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

The softening agent is preferably used in an amount of 0 to 150 parts by weight based on 100 parts by weight of the raw material rubber. However, the softener may be suitably adjusted in accordance with the raw material rubber, the blending ratio of various additives, and the physical properties of the rubber composition. have.

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.

The phenolic anti-aging agent is phenolic 2,2'-methylene-bis (4-methyl-6-tert-butylphenol), 2,2'-isobutylidene-bis (4,6-dimethylphenol), 2 Any one selected from the group consisting of, 6-di-t-butyl-p-cresol and combinations thereof can be used.

As the quinoline anti-aging agent, 2,2,4-trimethyl-1,2-dihydroquinoline and derivatives thereof may be used, and specifically 6-ethoxy-2,2,4-trimethyl-1,2-di 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 hydrocarbon may be preferably used as the wax.

The anti-aging agent may be N- (1,3-dimethylbutyl) -N-phenyl-p-phenylenediamine (N- (1,3-Dimethybutyl) -N-phenyl-p-phenylenediamine, 6PPD), N-phenyl n-isopropyl-p-phenylenediamine (3PPD) and poly (2,2,4-trimethyl-1,2-dihydroquinoline (Poly (2,2) , 4-trimethyl-1,2-dihydroquinoline, RD) and a combination thereof can be preferably used.

The anti-aging agent has a high solubility in rubber in addition to the anti-aging action, is low in volatility, inert to rubber, and does not inhibit vulcanization. It may be included in parts by weight.

The tire tread rubber composition for both aged and rough road trucks may be manufactured 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 can be prepared in a suitable mixer using a second step (called "production" step) of mechanical treatment at a low temperature of less than 110 ° C, for example 40 to 100 ° C, but the invention is not limited thereto. .

The dividing line and rough road truck tire according to another embodiment of the present invention is manufactured using the rubber composition for the tire tread. The method for manufacturing a tire and rough road combine truck 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 tire tread rubber composition for both elderly and off road trucks provides a rubber composition which is not required for the reduction of physical properties of other rubbers while improving the wear resistance and durability required for the elderly road, and the chipping resistance and cutting resistance required for the rough roads. .

In addition, since the tire tread rubber composition for both the aged and the rough road trucks does not use the coupling agent generally used when using silica, the durability and wear resistance are prevented while preventing the chipping resistance that may occur using the coupling agent. There is no effect of deterioration.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice 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.

Preparation Example: Preparation of Rubber Composition

To prepare a tire tread rubber composition according to the following Examples and Comparative Examples using the composition shown in Table 1. The preparation of the tire tread rubber composition was in accordance with a conventional method for producing tire tread rubber.

[Table 1] (Unit: parts by weight)

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Example Natural rubber 100 100 100 100 70 70 Styrene Butadiene Rubber ¹⁾ - - - - 30 30 Carbon black ²⁾ 40 50 40 40 40 40 Silica ³⁾ 10 10 20 10 10 20 Reinforcement resin ⁴⁾ 5 5 5 5 5 5 Methylene donor ⁵⁾ - - - 3 - 3 Zinc oxide 4.0 4.0 4.0 4.0 4.0 4.0 Stearic acid 1.5 1.5 1.5 1.5 1.5 1.5 brimstone 1.3 1.3 1.3 1.3 1.3 1.3 Vulcanization accelerator 1.2 1.2 1.2 1.2 1.2 1.2

1) Styrene butadiene rubber: Styrene butadiene rubber having 20 to 50 wt% vinyl content and 30 to 50 wt% styrene content in butadiene.

2) Carbon Black: Carbon black having a nitrogen adsorption specific surface area of 138 to 144 mg / g, a DBP oil absorption of 129 to 141 cc / 100 g, and a tint value of 113 to 125%.

3) Silica: Silica having a BET surface area of 163 to 173 m ² / g, CTAB adsorption specific surface area of 152 to 162 m ² / g, and a DBP oil absorption of 187 to 197 ml / 100 g.

4) Reinforcement resin: A phenol free novolak resin having a softening point of 105 to 120 ° C and a pre-phenol content of less than 1.0%.

5) Methylene donor: hexamethoxymethylmelamine (HMMM)

Using a rubber composition having a compounding ratio of Table 1 was used to manufacture a road tire and rough road combined truck tire (12R22.5 standard), and was mounted on the actual dump vehicle to evaluate the wear resistance performance along with the chipping resistance cutting performance, indoor Heat resistance was evaluated using the durability tester. The result is represented by the index in Table 2 below.

 TABLE 2

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Example Hardness 63 66 65 68 65 70 100% modulus
(kgf / cm2) 29 34 32 32 30 33 300% modulus
(kgf / cm2) 166 190 181 168 170 165 The tensile strength
(kgf / cm2) 280 288 296 290 319 331 Toughness 597 601 615 613 680 692 Hysteresis Index 100 92 90 115 90 105 Fever Resistance Index 100 89 93 113 90 109 Internal chipping cutting index 100 103 130 93 112 120 Abrasion Resistance Index 100 111 99 102 103 105

Hysteresis, heat generation resistance, chipping cutting index, and abrasion resistance index are shown as an index (Index) based on Comparative Example 1. The higher the index, the better the performance.

The heat resistance index indicates the endurance test evaluation result on the tread portion fever.

The chipping resistance index and the abrasion resistance index were evaluated by mounting a tire for the rear wheel of a dump truck.

As can be seen from the results of Table 2, it can be seen that the Examples are excellent in the numerical value of the hysteresis index, the heat resistance index, the chipping resistance index and the wear resistance index as compared with the results of Comparative Examples 1 to 5.

In addition, the examples show excellent results in hardness, toughness and tensile strength compared to the results of Comparative Examples 1 to 5, but also 100% modulus and 300% modulus also show the numerical value within the appropriate range.

In particular, in Comparative Example 2, the 300% modulus showed an excellent value, but the hysteresis index and the fever resistance index decreased, whereas in Comparative Example 3, the chipping resistance index was relatively excellent, but the hysteresis index and the wear resistance index decreased. . In the case of Comparative Example 4, especially, the chipping resistance index was bad, and thus it was difficult to use it as a rough road tire. In Comparative Example 5, the hysteresis performance and the heat resistance were not good.

Example compared with Comparative Examples 1 to 5, the heat resistance, chipping resistance and abrasion resistance overall improved. In addition, it can be seen that the hysteresis of the rubber is low and the heat resistance is excellent, but the modulus in the high elongation region is also lowered, so that the chipping performance is excellent. This is thought to be the result of using an appropriate amount of reinforcing resin with lower carbon black usage and higher silica usage.

In addition, the embodiment uses the reinforcing resin and the methylene donor in an appropriate amount to improve the cutting performance due to high hardness and modulus in the low elongation region, and lower heat generation due to the tread part deformation, thereby improving durability and improving both durable and rough roads. Excellent truck tires were confirmed.

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 (7)

100 parts by weight of raw rubber, including 10 to 30 parts by weight of styrene butadiene rubber (SBR) and 70 to 90 parts by weight of natural rubber (NR), 30 to 60 parts by weight of carbon black (CB), 5 to 25 parts by weight of silica, 2 to 8 parts by weight of a phenol free novolak resin, which is a reinforcing resin, and 2 to 6 parts by weight of methylene donor Including; The sum of the contents of the carbon black and the silica is 65 parts by weight or less in the tire tread rubber composition for trucks and roads in combination with roughness. The method of claim 1, Wherein the styrene butadiene rubber is 20 to 50% by weight of the butadiene vinyl content and styrene content of 30 to 50% by weight of the tire tread rubber composition for trucks and roads combine. The method of claim 1, The carbon black has a nitrogen adsorption specific surface area of 138 to 144 mg / g, n-dibutyl phthalate (DBP) oil absorption of 129 to 141 cc / 100 g, and a tint (TINT) value of 113 to 125%. Tire tread rubber composition. The method of claim 1, The silica has a BET surface area of 163 to 173 m ² / g, CTAB (cetyl trimethyl ammonium bromide) adsorption specific surface area of 152 to 162 m ² / g, DBP oil absorption amount of 187 to 197 ml / 100g for both aged and rough road trucks Tire tread rubber composition. The method of claim 1, The phenol-free novolak resin has a softening point of 105 to 120 ℃, the pre-phenol content is less than 1.0% by weight tire tread rubber composition for trucks and roads. The method of claim 1, The methylene donor is any one selected from the group consisting of hexamethoxymethylmelamine, hexamethylenetetramine, 2-nitro-2-methyl propanol, and combinations thereof A tire tread rubber composition for a nursing home and rough road combined truck. A tire and a rough road truck tire manufactured using the tire tread rubber composition for the old and rough road truck according to any one of claims 1 to 6.