KR101425549B1 - Carcass topping composition and tire manufactured by using the same - Google Patents

Abstract

The present invention relates to a carcass topping rubber composition and a tire produced therefrom. More particularly, the present invention relates to a carcass topping rubber composition comprising 1 to 20 parts by weight of an air permeation preventing resin per 100 parts by weight of a raw rubber, And a tire made using the same.
By using the carcass topping rubber composition according to the present invention, the inner liner and / or the air permeation preventing layer of the tire are omitted, and the thickness of the tie rubber layer is made thin, thereby reducing the hysteresis loss and improving the fuel consumption. It is possible to obtain a reduction effect in terms of material cost.

Description

TECHNICAL FIELD [0001] The present invention relates to a carcass topping rubber composition and a tire produced using the same. BACKGROUND ART [0002]

TECHNICAL FIELD The present invention relates to a carcass topping rubber composition and a tire produced using the same, wherein an inner liner and / or an air permeation preventive layer of a tire are omitted and a thickness of a tie rubber layer is reduced to reduce hysteresis loss, The present invention relates to a carcass topping rubber composition capable of reducing the weight of a tire as well as reducing a material cost, and a tire manufactured using the same.

In order to have air retention in the pneumatic tire, a structure made of rubber having good air permeability, such as an inner liner, is placed inside the tire to hold air.

In the case of bias type tires, a separate tube for air retention functions, and in recent radial tires, an inner liner, which acts as a tube, is attached to the inside of the tire so that air retention can be imparted without using a separate tube .

Although halobutyl rubber having a low air permeability is used as a raw rubber for air-retaining rubber, halobutyl is not compatible with other diene rubbers and is disadvantageous in cracking at low temperatures. Therefore, when used as an inner liner of a tire, There is a drawback that cracks can easily occur in one region.

Since the halobutyl rubber has a large loss of hysteresis, when used as an inner liner, a rubber sheet called a tie rubber having a small hysteresis loss is inserted to bond the carcass layer and the inner liner layer. In this case, the tie rubber sheet for joining increases the weight of the tire as the total thickness of the tire layer exceeds 1 mm (1,000 袖 m), which adversely affects the fuel efficiency.

In the prior art, there is a technique of omitting the inner liner structure or the tie rubber by coating an air permeation preventive layer of 0.001 to 0.05 mm in order to solve the above problem.

Korean Patent No. 10-1085033 discloses a structure in which a carcass rubber layer is bonded to the inner and outer surfaces of an inner liner which is an unstretched film of a polymer composition composed of 60 to 90% by weight of a thermoplastic resin and 10 to 40% by weight of an elastomer, Korean Patent Laid-Open Publication No. 2005-0096280 discloses a rubber composition comprising a polyvinylidene chloride-based resin in a rubber layer selected from an inner liner inner circumferential surface, a carcass rubber inner circumferential surface, an inner liner and other rubber layers, and between carcass rubber and other rubber layers, An anti-airtight layer formed by coating a coating solution having a thickness of 0.001 to 0.05 mm by dissolving a polyvinylidene chloride resin selected from polyisocyanates, ketones, and tetrahydrofuran in a co-solvent capable of swelling a rubber component, And rubber or tie rubber can be omitted.

However, in manufacturing a general tire, the inner liner portion is expanded by expanding the inner portion of the tire to the inner side of the tire, so that the coating layer may be damaged by the brother and it can not be a fundamental measure to effectively prevent air permeation due to a very small thickness.

On the other hand, the carcass is the most important part of the skeleton in a tire, and it must be able to withstand the air pressure, the load and the impact inside the tire. Various studies have been conducted on the carcass cord and the topping rubber layer.

The rubber layer of carcass topping is mainly composed of natural or synthetic rubber. Recently, attempts have been made to introduce various compositions to change physical properties.

Korean Patent Laid-Open No. 2010-0002754 discloses a carcass rubber composition comprising 100 parts by weight of a raw rubber as a vulcanization accelerator, N-cyclohexyl-2-2-benzothiazyl and 0.5 to 1.5 parts by weight of sulfenamide as a vulcanization accelerator.

Korean Patent Publication No. 2010-0002746 discloses a rubber composition comprising 40 to 60 parts by weight of carbon black and 100 parts by weight of 2,3-bis (phenylamino) cyclohexa-2,5-diene-1,4-dione (2, 2 to 4 parts by weight of a combination of 3-bis (phenylamino) cyclohexa-2,5-diene-1,4-dione (BCDD).

As described above, there has been a research aiming at the improvement of the physical properties in relation to the conventional carcass topping rubber layer, but no patent has been proposed to obtain the air permeation preventing effect on the topping rubber layer itself.

Korean Patent No. 10-1085033 Korean Patent Publication No. 2005-0096280 Korea Patent Publication No. 2010-0002754 Korean Patent Publication No. 2010-0002746

Accordingly, an object of the present invention is to provide a topping rubber composition having a high air permeation preventing effect.

Another object of the present invention is to provide a pneumatic tire including the topping rubber composition, wherein the inner liner and / or the air permeation preventive layer are omitted.

In order to achieve the above object, a carcass topping rubber composition according to an embodiment of the present invention comprises 100 parts by weight of a raw rubber and 1 to 20 parts by weight of an air permeation preventing resin.

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

The raw material rubber may contain 1 to 60 parts by weight of halobutyl rubber.

Wherein the halobutyl raw rubber is selected from the group consisting of polyvinylidene chloride, vinylidene chloride copolymer (vinylidene chloride-vinyl chloride copolymer, vinylidene chloride-acrylic ester copolymer, vinylidene chloride-acrylic ester-vinyl chloride terpolymer) And a combination of these.

The air permeation preventing resin may include one selected from the group consisting of polyvinyl alcohol, ethylene vinyl alcohol, and combinations thereof.

According to another aspect of the present invention, there is provided a tire comprising a tread, a sidewall, and a bead portion, the tire including a carcass bonded to a tie rubber sheet, wherein the carcass cord is arranged at regular intervals, And a topping rubber layer surrounding the carcass cord, wherein the topping rubber layer is manufactured using the carcass topping rubber composition.

The tire may not have an inner liner inside.

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

The tire according to an embodiment of the present invention is characterized in that the tire is manufactured using a carcass topping rubber composition containing 1 to 20 parts by weight of an air permeation preventing resin with respect to 100 parts by weight of raw rubber.

A pneumatic tire for an automobile, comprising: a carcass cord composed of a tread, a side wall, and a bead portion and having a carcass joined to a tie rubber sheet therein, the carcass cord being arranged at regular intervals, The topping rubber layer has a structure surrounding it.

Particularly, the composition of the new composition according to the present invention can be introduced into the topping rubber layer, thereby replacing the inner liner which previously served as an air bearing in the conventional tire.

Specifically, the topping rubber layer contains 1 to 20 parts by weight of an air permeation preventing resin so as to replace the inner liner with respect to 100 parts by weight of the raw rubber.

By forming a high air barrier layer through the air permeation preventing resin, it can replace the role of the conventional inner liner. Such a resin is selected from the group consisting of polyvinyl alcohol, ethylene vinyl alcohol and a combination thereof, preferably polyvinyl alcohol.

When the content of the resin exceeds 20 parts by weight, there is a problem that the mechanical properties such as a decrease in the modulus and elongation are decreased. On the contrary, if the content is less than 1 part by weight, the above- none.

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. Examples of the modified natural rubber include epoxidized natural rubber (ENR), deproteinized natural rubber (DPNR), hydrogenated natural rubber and the like.

The synthetic rubber may be at least one selected from the group consisting of styrene butadiene rubber (SBR), modified styrene butadiene rubber, butadiene rubber (BR), modified butadiene rubber, chlorosulfonated polyethylene rubber, epichlorohydrin rubber, fluorine rubber, silicone rubber, Butadiene rubber, 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, Ethylene vinyl acetate rubber, acrylic rubber, hydrin rubber, vinyl benzyl chloride styrene butadiene rubber, bromomethyl styrene butyl rubber, maleic styrene butadiene rubber, carboxylic styrene butadiene rubber, epoxy isoprene rubber, ethylene propylene rubber maleic acid, Nitrile butadiene rubber 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.

Preferably, the raw material rubber includes 1 to 60 parts by weight of a halobutyl raw material rubber in the composition. Such a halobutyl raw rubber may be a copolymer of a polyvinylidene chloride, a vinylidene chloride copolymer (a vinylidene chloride-vinyl chloride copolymer, a vinylidene chloride-acrylic ester copolymer, a vinylidene chloride-acrylic ester-vinyl chloride terpolymer) And a combination thereof.

If the content of the halobutyl raw rubber exceeds the above range, the adhesion between the carcass cord and the tie rubber sheet is deteriorated. On the other hand, if the content is less than the above range, sufficient air permeation preventing effect can not be secured.

In addition, the carcass-topping rubber composition may contain conventional additives such as silica or carbon black as a reinforcing filler, process oil as a softening agent, sulfur as a vulcanizing agent, CBS as a vulcanization accelerator, 1,3-diphenylguanidine (DPG) Zinc stearate, stearic acid, a coupling agent for improving dispersibility, and an antioxidant, which are commonly used in carcass-topping rubber compositions.

The silica to be used as a reinforcing filler in the present invention is not particularly limited in its kind, but preferably has a surface area of 175 ± 20 m 2 / g, a water content of 8.0 wt% or less and a silicon dioxide (SiO ₂ ) content of 90 wt% Do. Ultrasil VN2 (manufactured by Degussa AG), Ultrasil VN3 (manufactured by Degussa AG), Z1165MP (manufactured by Rhodia) or Z165GR (manufactured by Rhodia) can be used as the commercially available products. .

The silica may be contained in an amount of 20 to 90 parts by weight based on 100 parts by weight of the raw rubber, more preferably 30 to 70 parts by weight, and further preferably 40 to 60 parts by weight. When the content of the silica is less than 20 parts by weight, improvement of the strength of the rubber is insufficient, and dispersion of the silica in which the content of the silica is 90 parts by weight may be a problem.

The carbon black used in the present invention is not particularly limited in its kind, but it is preferable that the carbon black has a BET (Brunauer, Emmett, Teller) specific surface area of 70 to 100 m 2 / g and a Di-n-bibutyl Phthalate (DBP) / 100 g, and the iodine adsorption value is preferably in the range of 90 to 120 mg / g. If the nitrogen adsorption specific surface area of the carbon black exceeds the above range, the workability of the rubber composition for a tire may be deteriorated. If the nitrogen adsorption specific surface area is less than the above range, the reinforcing performance by the carbon black as a filler may be deteriorated. If the adsorption value of the carbon black exceeds the above range, the workability of the rubber composition may be deteriorated. If it is less than this range, the reinforcing performance by the carbon black as the 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 is preferably used in an amount of 40 to 100 parts by weight based on 100 parts by weight of the raw rubber. If the amount is less than 40 parts by weight, sufficient reinforcing effect is not exhibited. If the amount is more than 100 parts by weight,

The carcass topping rubber composition may further comprise other fillers. The other filler may be any one selected from the group consisting of calcium carbonate, clay (hydrated aluminum silicate), aluminum hydroxide, lignin, silicate, talc, and combinations thereof.

The softening agent represented by the process oil 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. it means. The softening agent refers to oil contained in process oil and other rubber compositions. 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 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 5 to 25 wt%, a naphthalene content 25 to 45% by weight and a paraffinic content of 35 to 65% by weight can be preferably used.

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, konyu, 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 0 to 150 parts by weight based on 100 parts by weight of the raw material rubber in order to improve workability of the raw material rubber.

The carcass topping rubber composition may further include various additives such as additional vulcanizing agents, vulcanization accelerators, vulcanization accelerators, anti-aging agents, softening agents or pressure-sensitive adhesives. 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, metal oxides such as sulfur vulcanizing agents, organic peroxides, resin vulcanizing agents, and magnesium oxide can be used.

The sulfur vulcanizing agent is an inorganic vulcanizing agent such as powder sulfur (S), insoluble sulfur (S), precipitated sulfur (S), colloid sulfur, etc., tetramethylthiuram disulfide (TMTD) Organic vulcanizing agents such as tetraethyltriuram disulfide (TETD) and dithiodimorpholine can be used. As the sulfur vulcanizing agent, a vulcanizing agent which produces elemental sulfur or sulfur, for example, amine disulfide, polymer sulfur and the like can be used.

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

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.

Further, the vulcanization accelerator refers to an accelerator that accelerates the vulcanization rate or accelerates the retardation at the initial vulcanization stage.

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 dithiocarbamate-based vulcanization accelerator include zinc ethylphenyldithiocarbamate, zinc butylphenyldithiocarbamate, sodium dimethyldithiocarbamate, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, Zinc dibutyldithiocarbamate, zinc diamidithiocarbamate, zinc dipropyldithiocarbamate, complexation of zinc with piperidinedithiocarbamate and piperidine, zinc hexadecylisopropyldithiocarbamate, octadecyl Isopropyl dithiocarbamic acid zinc zinc dibenzyldithiocarbamate, sodium diethyldithiocarbamate, penta methylenedithiocarbamate, sodium selenium dimethyldithiocarbamate, diethyldithiocarbamate, sodium diethyldithiocarbamate, Cadmium dithiocarbamate, and combinations thereof. The dithiocarbamic acid-based compound may be used alone or in combination of two or more thereof.

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.

Examples of the coupling agent include a sulfide-based silane compound, a mercapto-based silane compound, a vinyl-based silane compound, an amino-based silane compound, a glycidoxine clock silane compound, a nitro- based silane compound, a chlorosilicate compound, a methacrylic silane compound, , And a sulfide-based silane compound can be preferably used.

The sulfide-based silane compound is preferably selected from the group consisting of bis (3-triethoxysilylpropyl) tetrasulfide, bis (2-triethoxysilylethyl) tetrasulfide, bis (2-trimethoxysilylethyl) tetrasulfide, bis (4-trimethoxysilylbutyl) tetrasulfide, bis (3-triethoxysilylpropyl) trisulfide, bis Bis (3-trimethoxysilylethyl) trisulfide, bis (4-triethoxysilylethyl) trisulfide, bis (4-trimethoxysilylbutyl) trisulfide, bis (3-triethoxysilylbutyl) disulfide, bis (4-triethoxysilylbutyl) disulfide, bis 3-trimethoxysilylpropyl) disulfide, bis (2-trimethoxy Triethoxysilylbutyl) disulfide, 3-trimethoxysilylpropyl-N, N-dimethylthiocarbamoyltetrasulfide, 3-triethoxysilylpropyl-N, N-dimethyl 2-triethoxysilylethyl-N, N-dimethylthiocarbamoyltetrasulfide, 2-trimethoxysilylethyl-N, N-dimethylthiocarbamoyltetrasulfide, 3-trimethoxysilyl 3-trimethoxysilylpropylmethacrylate monosulfide, 3-trimethoxysilylpropylmethacrylate monosulfide, and combinations thereof may be used in combination with at least one compound selected from the group consisting of benzothiazolyl tetrasulfide, 3-triethoxysilylpropylbenzothiazole tetrasulfide, 3-trimethoxysilylpropylmethacrylate monosulfide, And the like.

The mercaptosilane compound may be at least one selected from the group consisting of 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 2-mercaptoethyltrimethoxysilane, 2-mercaptoethyltriethoxysilane, May be any one selected from the group consisting of The vinyl-based silane compound may be any one selected from the group consisting of ethoxysilane, vinyltrimethoxysilane, and combinations thereof. The amino-based silane compound is preferably selected from the group consisting of 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3- (2-aminoethyl) aminopropyltriethoxysilane, 3- Methoxysilane, and a combination thereof.

The glycidoxime silane compound is preferably selected from the group consisting of? -Glycidoxypropyltriethoxysilane,? -Glycidoxypropyltrimethoxysilane,? -Glycidoxypropylmethyldiethoxysilane,? -Glycidoxypropylmethyldimethoxysilane And a combination thereof. The nitro-based silane compound may be any one selected from the group consisting of 3-nitropropyltrimethoxysilane, 3-nitropropyltriethoxysilane, and combinations thereof. The chloro-based silane compound is selected from the group consisting of 3-chloropropyltrimethoxysilane, 3-chloropropyltriethoxysilane, 2-chloroethyltrimethoxysilane, 2-chloroethyltriethoxysilane, and combinations thereof Lt; / RTI >

The methacrylic silane compound may be any one selected from the group consisting of? -Methacryloxypropyltrimethoxysilane,? -Methacryloxypropylmethyldimethoxysilane,? -Methacryloxypropyldimethylmethoxysilane, and combinations thereof Lt; / RTI >

The coupling agent may be included in an amount of 1 to 20 parts by weight based on 100 parts by weight of the raw rubber for improving dispersibility of the silica. If the content of the coupling agent is less than 1 part by weight, improvement in dispersibility of silica may be insufficient, resulting in deterioration of rubber workability and lowering of fuel consumption performance. When the amount exceeds 20 parts by weight, the interaction between silica and rubber is too strong, May occur.

In addition, the antioxidant is an additive used for stopping 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.

The pressure-sensitive adhesive further improves the tack performance between the rubber and the rubber and improves the physical properties of the rubber by improving the mixing properties, dispersibility and processability of other additives such as fillers.

As the pressure-sensitive adhesive, a natural resin-based pressure-sensitive adhesive such as a rosin-based resin or a terpene-based resin and a synthetic resin-based pressure-sensitive adhesive such as a petroleum resin, a coal tar, or an alkylphenolic resin can be used.

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

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

The coal tar may be a coumarone-indene resin.

The alkylphenol resin may be a p-tert-alkylphenol formaldehyde resin and the p-tert-alkylphenol formaldehyde resin may be a p-tert-butyl-phenol formaldehyde resin, p-tert- And a combination thereof.

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

On the other hand, the carcass-topping rubber composition according to the present invention is manufactured through a conventional manufacturing process, and carcass parts are formed by enclosing the carcass cord. The tread, sidewall, bead, tie rubber sheet, and carcass cord may be made of any known materials and shapes, and are not particularly limited in the present invention.

Particularly, in the present invention, the inner liner and / or the air permeation preventive layer can be omitted by using the carcass-topping rubber composition, which is advantageous in that the hysteresis loss can be reduced and the fuel consumption can be improved. In addition, by omitting the inner liner, the tie rubber layer is formed thinly to a thickness of 0.5 mm or less, thereby reducing the weight of the tire and reducing the cost.

A tire according to another embodiment of the present invention is manufactured using the carcass topping rubber composition. The method of manufacturing a tire using the carcass topping rubber composition can be applied to 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.

By using the carcass topping rubber composition according to the present invention, the inner liner and / or the air permeation preventing layer of the tire are omitted, and the thickness of the tie rubber layer is made thin, thereby reducing the hysteresis loss and improving the fuel consumption. It is possible to obtain a reduction effect in terms of material cost.

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.

[ Example ]

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.

[ Example  And Comparative Example ] Preparation of rubber composition

Carcass topping rubber compositions according to Examples and Comparative Examples were prepared using the compositions shown in Tables 1 and 2 below. Specifically, each composition was mixed in a Banbury mixer to prepare a masterbatch, followed by vulcanization at 170 DEG C for 15 minutes to prepare a rubber specimen having a thickness of 1.0 mm.

Composition (parts by weight) Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Natural rubber 70 70 70 70 70 70 70 Synthetic rubber 30 30 30 30 30 30 30 Resin for air permeation prevention ⁽¹⁾ 1.0 5.0 10.0 20.0 - 0.5 22 Carbon black 60 60 60 60 60 60 60 Phenolic resin 2.0 2.0 2.0 2.0 2.0 2.0 2.0 Zinc oxide 2.0 2.0 2.0 2.0 2.0 2.0 2.0 Stearic acid 1.0 1.0 1.0 1.0 1.0 1.0 1.0 DM 0.8 0.8 0.8 0.8 0.8 0.8 0.8 Diphenylguanidine 0.8 0.8 0.8 0.8 0.8 0.8 0.8 brimstone 2.2 2.2 2.2 2.2 2.2 2.2 2.2 Paraffin oil 10 10 10 10 10 10 10

Note) (1) Air permeation Resin: Polyvinyl alcohol

[ Experimental Example  One]

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

(1) 300% modulus and elongation

The 300% modulus and elongation percentage indicate higher tensile properties as the numerical value increases, and the higher the value of the wear resistance, the better the abrasion resistance performance, measured according to the ISO 37 standard. The elongation at break refers to the elongation at break, which is measured by a method in which the strain value until the test piece is broken in a tensile tester is expressed as a percentage.

(2) Air permeability

Was measured using an oxygen permeability analyzer (Model 8000, manufactured by Illinois Instruments) in accordance with ASTM D-3895, as an indicator of the air permeation preventive performance evaluation.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 300% modulus
(kgf / cm ² ) 152 148 142 131 150 151 125 Elongation (%) 341 356 371 385 342 338 401 Air permeability
(fm / Pa s) 37.2 32.3 27.7 22.8 51.2 49.6 19.2

With reference to Table 2, the rubber compositions of Examples 1 to 4, in which the air permeation preventing resin was put in accordance with the present invention, had a modulus of 300% slightly smaller and a tendency to increase elongation, While the permeability of air was increased.

In addition, the rubber composition of Comparative Example 2 in which a small amount of the air permeation preventing resin was used had a low air permeability, while the rubber composition of Comparative Example 3, which was excessively used, exhibited excellent air permeability, but significantly decreased elongation and modulus .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

Claims (7)

100 parts by weight of raw rubber and
1 to 20 parts by weight of an air permeation preventing resin,
Wherein the raw material rubber comprises 1 to 60 parts by weight of a halobutyl rubber,
The halobutyl rubber may be selected from the group consisting of polyvinylidene chloride, vinylidene chloride copolymer (vinylidene chloride-vinyl chloride copolymer, vinylidene chloride-acrylic ester copolymer, vinylidene chloride-acrylic ester-vinyl chloride terpolymer) And a combination thereof. The carcass-topping rubber composition according to claim 1, The method according to claim 1,
Wherein the raw material rubber comprises one kind selected from the group consisting of natural rubber, synthetic rubber, and combinations thereof. delete delete The method according to claim 1,
Wherein the air permeation preventing resin comprises one selected from the group consisting of polyvinyl alcohol, ethylene vinyl alcohol, and combinations thereof. A carcass cord comprising a tread, a side wall and a bead portion and having a carcass joined to a tie rubber sheet therein, wherein the carcass is arranged at regular intervals, and a carcass cords In a tire,
Wherein the topping rubber layer is made using the carcass-topping rubber composition of claim 1. The tire according to claim 6, wherein the tire does not have an inner liner inside.