KR101791889B1 - Rubber composition for protecting a sidewall of tire against ozone and tire manufacturing by using the same - Google Patents
Rubber composition for protecting a sidewall of tire against ozone and tire manufacturing by using the same Download PDFInfo
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- KR101791889B1 KR101791889B1 KR1020150169826A KR20150169826A KR101791889B1 KR 101791889 B1 KR101791889 B1 KR 101791889B1 KR 1020150169826 A KR1020150169826 A KR 1020150169826A KR 20150169826 A KR20150169826 A KR 20150169826A KR 101791889 B1 KR101791889 B1 KR 101791889B1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
- C08K5/18—Amines; Quaternary ammonium compounds with aromatically bound amino groups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L21/00—Compositions of unspecified rubbers
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- Polymers & Plastics (AREA)
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Abstract
The present invention relates to a rubber composition capable of protecting a tire sidewall from ozone and a tire made using the rubber composition. More particularly, the present invention relates to an anti-aging rubber sheet between a sidewall and a carcass, Is produced by using a rubber composition comprising 100 parts by weight of raw rubber, 20 to 60 parts by weight of carbon black, and 2 to 5 parts by weight of an amine-based antioxidant.
In the case of a tire produced by using the rubber composition according to the present invention, the blackness of the appearance is not changed and the ozone resistance is remarkably improved.
Description
The present invention relates to a rubber composition capable of protecting a tire sidewall from ozone and a tire produced using the rubber composition. More particularly, the present invention relates to a rubber composition which is excellent in ozone resistance against aging phenomenon generated from ozone or ultraviolet rays, The present invention relates to a rubber composition capable of protecting a sidewall from ozone by being disposed in a sheet form between a wall and a carcass portion, and a tire made using the rubber composition.
The sidewall area of the tire contains various information about the tire, and unlike the tread contacting with the ground, it should have the characteristics of extreme environmental factors such as sunlight, temperature, ozone, oxygen, and weather resistance.
Since the side walls of a tire are required to receive light from the sun, frequently perform bending movements, and emit heat generated from the tire to the outside, weather resistance, aging resistance, flexural resistance, heat resistance, heat resistance and ozone resistance are required. Various additives are used to obtain the necessary properties for the sidewall. As a commonly used material, a rubber composition comprising a large amount of an amine-based anti-aging agent or wax in a diene rubber component is widely used.
However, such an amine-based antioxidant has a disadvantage in that the rubber is discolored due to precipitation on the rubber surface over time, and in order to prevent discoloration of the appearance, an antioxidant is added to the rubber component in a very small amount, Instead of such an antioxidant, a method of blending a large amount of wax was also used.
In the case of the rubber composition using a large amount of the wax, the ozone resistance in the static state was maintained, and deterioration of the appearance caused by the amine type antioxidant was prevented to some extent.
However, it has not been possible to solve the problems of heat resistance, ozone resistance in a dynamic state, and weather resistance, which are other physical properties required for a side wall rubber.
Ultimately, in order to solve such a problem, amine-based antioxidants or waxes should not be used. However, if amine-based antioxidants or waxes are not blended, problems such as weather resistance, ozone resistance and heat resistance, Can occur.
Therefore, a new antioxidant capable of minimizing discoloration of the outer appearance of the tire, maximizing the weatherability, ozone resistance and heat resistance of the tire sidewall portion, or minimizing discoloration can be developed, It is necessary to make efforts such as changing the structure of the side walls.
An object of the present invention is to provide a tire in which a seat including a rubber composition for protecting the tire side wall portion from ozone is placed between the side wall portion and the carcass portion.
According to a preferred embodiment of the present invention, there is provided an anti-aging rubber sheet between a sidewall and a carcass, wherein the anti-aging rubber sheet comprises 100 parts by weight of raw rubber, 20 to 60 parts by weight of carbon black, And 2 to 5 parts by weight of the rubber composition.
The amine type antioxidant may be at least one selected from the group consisting of N-phenyl-N '- (1,3-dimethyl) -p-phenylenediamine, N- (1,3-dimethylbutyl) -N'- -Phenylenediamine, N, N'-diphenyl-p-phenylenediamine, N, N'-diaryl-p-phenylenediamine, N-phenyl- Cyclohexyl-p-phenylenediamine, N-phenyl-N'-octyl-p-phenylenediamine, and combinations thereof.
The sidewall may include 100 parts by weight of raw rubber and 0 to 2 parts by weight of an amine-based anti-aging agent.
The rubber composition may further comprise 1 to 3 parts by weight of any one of antioxidants selected from the group consisting of phenol, quinoline, imidazole, carbamic acid metal salt, wax, and combinations thereof.
The rubber composition may further comprise 1 to 3 parts by weight of 2,2,4-trimethyl-1,2-dihydroquinoline.
The tire produced by using the rubber composition for protecting the tire sidewall according to the present invention from ozone has the effect of not changing the blackness of the appearance and significantly improving the ozone resistance.
1 is a sectional view of a side wall portion of a tire according to an embodiment of the present invention.
2 is an enlarged cross-sectional view of a side wall portion of a tire according to an embodiment of the present invention.
3 is a schematic view of a tire cross-sectional layer in which a rubber composition for protecting a tire sidewall from ozone is disposed between a sidewall and a carcass according to an embodiment of the present invention.
Hereinafter, embodiments of the present invention will be described in more detail to enable those skilled in the art to 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.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It should be understood that the terms " comprises " or " having ", and the like in the description of the present invention are intended to specify the presence of stated features, integers, But do not preclude the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.
Fig. 1 is a schematic view of a cross section of a sidewall portion of a tire, Fig. 2 is an enlarged schematic view of a sidewall portion, and Fig. 3 is a cross sectional view of a rubber composition according to an embodiment of the present invention, which is located between a sidewall portion and a carcass portion And the structure of the sheet is shown.
According to an embodiment of the present invention, there is provided a tire comprising an anti-aging rubber sheet between a side wall portion and a carcass portion, wherein the anti-aging rubber sheet may include a rubber composition to which an amine antioxidant is added.
The anti-aging rubber sheet is intended to improve the weather resistance, ozone resistance and heat resistance of the sidewall portion by the transition of the amine-based antioxidant to the sidewall portion with the lapse of time. At the same time, the amount of the amine antioxidant in the sidewall portion is minimized to prevent discoloration of the initial sidewall portion.
As shown in Figs. 1 and 2, the sidewall portion of the tire comprises a
The
The
In the anti-aging rubber sheet (3) of the present invention, at least one rubber selected from natural rubber, modified natural rubber and synthetic rubber may be used as the raw rubber.
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 in the natural rubber, natural rubber containing trans-1,4-isoprene as a main component, such as balata, Rubber may also be included.
The modified natural rubber means that the natural rubber is denatured or purified. Examples of the modified natural rubber include epoxidized natural rubber (ENR), deproteinized natural rubber (DPNR), hydrogenated natural rubber, and the like.
Examples of the synthetic rubber include synthetic rubber such as styrene butadiene rubber (SBR), modified styrene butadiene rubber, butadiene rubber (BR), modified butadiene rubber, isoprene rubber, neoprene rubber, chlorosulfonated polyethylene rubber, epichlorohydrin rubber, Butadiene rubber (NBR), modified nitrile butadiene rubber, chlorinated polyethylene rubber, styrene ethylene butylene styrene (SEBS) rubber, ethylene propylene rubber, ethylene propylene diene (EPDM) Butadiene rubber, maleic acid styrene butadiene rubber, carboxylic acid styrene butadiene rubber, epoxy isoprene rubber, acrylonitrile-butadiene rubber, acrylonitrile-butadiene rubber, acrylonitrile-butadiene rubber, , Maleic ethylene propylene rubber, carboxylic acid nitrile butadiene Rubber, BIMS (brominated polyisobutyl isoprene-co-paramethyl styrene), and may be a one selected from the group consisting of mixtures thereof, but is not limited to this.
Particularly, as the synthetic rubber, butadiene rubber can be preferably used, and a high-cis butadiene rubber can be more preferably used. The high-sheath butadiene rubber may have a cis-1,4 content of 96% by weight or more and a glass transition temperature (Tg) of -104 to -107 ° C. The high-cis butadiene rubber has an effect that the low-temperature property and rebound resilience are advantageous within the range of the cis-1,4 content and the glass transition temperature.
The raw rubber may be a natural rubber or a mixed rubber in which a modified natural rubber and a synthetic rubber are mixed to improve appearance, prevent tearing, and maintain fatigue resistance. In this case, natural rubber or modified natural rubber and synthetic rubber may be used in a ratio of 1: 9: 1. ≪ / RTI > When the natural rubber or the modified natural rubber is contained in an amount of less than 1 part by weight, the performance to the inner layer may be deteriorated and the appearance may be deteriorated. When the synthetic rubber is contained in an amount of less than 1 part by weight, .
In the anti-aging rubber sheet (3) of the present invention, the amine-based antioxidant may be at least one selected from the group consisting of N-phenyl-N '- (1, 3-dimethyl) -p-phenylenediamine (6PPD) Phenylphenylenediamine (IPPD), N, N'-diphenyl-p-phenylenediamine, N, N'- -Diaryl-p-phenylenediamine, N-phenyl-N'-cyclohexyl-p-phenylenediamine, N-phenyl-N'-octyl-p-phenylenediamine and combinations thereof Any one of them may be used in an amount of 2 to 5 parts by weight per 100 parts by weight of the raw rubber. More preferably, the amine-based antioxidant may be 6PPD or IPPD having both excellent heat aging resistance and ozone resistance. If the amine-based antioxidant is used in an amount of less than 2 parts by weight, the effect of preventing aging is insufficient. If the amine-based antioxidant is used in an amount of more than 5 parts by weight, migration of the amine-based antioxidant may increase and discoloration may occur.
The carbon black contained in the
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 used in an amount of 20 to 60 parts by weight per 100 parts by weight of the raw rubber. When the carbon black is used in an amount of less than 20 parts by weight, the rubber durability of the tire tends to be low due to insufficient rubber sheet reinforcement. If it exceeds 60 parts by weight, hysteresis of the rubber sheet increases, have.
The anti-aging rubber sheet (3) of the present invention may further comprise an anti-aging agent in addition to the amine-based anti-aging agent. The antioxidant is an additive used for stopping a chain reaction in which a tire is autoxidized by oxygen, and is selected from the group consisting of phenol, quinoline, imidazole, carbamic acid metal salt, wax, and combinations thereof Can be appropriately selected and used.
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 such conditions that the solubility of the antioxidant other than the amine-based antioxidant is required to be high in solubility in rubber, low in volatility, inactive with respect to rubber, and not inhibited by vulcanization, 1 to 3 parts by weight based on the total weight of the composition.
More preferably, the anti-aging rubber sheet (3) of the present invention may further comprise 1 to 3 parts by weight of 2,2,4-trimethyl-1,2-dihydroquinoline (RD) per 100 parts by weight of the raw rubber . RD is less disadvantageous in ozone resistance than 6PPD or IPPD, but is inexpensive and advantageous in physical properties such as heat aging resistance and endothelial property. As the content of RD increases, migration of the amine-based antioxidant to the side-wall rubber increases, thereby improving ozone resistance.
When the RD is contained in an amount of less than 1 part by weight, migration of the amine-based anti-aging agent in the anti-aging rubber sheet may be restricted, thereby preventing aging of the side wall portion. Migration of the amine-based antioxidant may be promoted too much, resulting in discoloration of the side wall of the amine-based antioxidant. In addition, the use of excessive RD may lower the adhesive strength between the anti-aging rubber sheet and the side wall rubber or the carcass rubber, resulting in deterioration of tire durability performance.
The
As the vulcanizing agent, a sulfur vulcanizing agent can be preferably used. The sulfur vulcanizing agent may be selected from inorganic vulcanizing agents such as powder sulfur (S), insoluble sulfur, precipitated sulfur, colloid sulfur, elemental sulfur and polymer sulfur, and vulcanizing agents for producing sulfur such as amine sulfide organic vulcanizing agents such as disulfide, tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide (TETD), and dithiodimorpholine can be used.
It is preferable that the vulcanizing agent is included in an amount of 1.5 to 2.5 parts by weight based on 100 parts by weight of the raw material rubber, since the raw rubber 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 may be used.
Examples of the thiuram-based vulcanization accelerator include tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide, tetramethylthiuram monosulfide, dipentamethylthiuram disulfide, dipentemethylthiuram 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 thiourea vulcanization accelerators 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.
As the guanidine-based vulcanization accelerator, any one of guanidine compounds selected from the group consisting of diphenyl guanidine, diorthotolyl guanidine, triphenyl guanidine, orthotolyl guanidine, diphenyl guanidine phthalate, and combinations thereof can be used have.
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 Zinc diisopropyldithiocarbamate, zinc dibenzyldithiocarbamate, sodium diethyldithiocarbamate, pentamethylenedithiocarbamate, sodium selenium dimethyldithiocarbamate, diethyldithiocarbamate, sodium diethyldithiocarbamate, Cadmium diethyldithiocarbamate, and a combination thereof. The dithiocarbamic acid-based compound may be used alone or in combination of two or more thereof.
Examples of the aldehyde-amine-based or aldehyde-ammonia-based vulcanization accelerator include aldehyde selected from the group consisting of acetaldehyde-aniline reactant, butylaldehyde-aniline inclusion, hexamethylenetetramine, acetaldehyde- -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. As the xanthate vulcanization accelerator, for example, xanthate such as zinc dibutylxanthogenate Compounds may be used.
The vulcanization accelerator may be included in an amount of 0.6 to 1.2 parts by weight with respect to 100 parts by weight of the raw 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 accelerator, any one selected from the group consisting of zinc oxide (ZnO), zinc carbonate (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 zinc oxide and stearic acid are used together, 2.0 to 4.0 parts by weight may be used for 100 parts by weight of the raw material rubber, respectively, in order to serve as a proper vulcanization accelerator. If the contents of zinc oxide and stearic acid are less than the above ranges, 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 softening agent is added to the rubber composition in order to impart plasticity to the rubber to facilitate processing or to reduce the hardness of the vulcanized rubber, and means oil or other materials used for rubber compounding or rubber production. The softening agent refers to oils contained in process oil or 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 softener preferably has a total content of PAHs components of 3% by weight or less, a kinematic viscosity of 95 or more (210 o F SUS), an aromatic component of 15 to 25% by weight in the softener, A TDAE oil having 27 to 37% by weight of a component and 38 to 58% by weight of a paraffin component can be preferably used.
The TDAE oil has favorable characteristics for environmental factors such as low temperature characteristic of tire side wall including TDAE oil and possibility of cancer induction of PAHs while improving fuel efficiency 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 2.0 to 6.0 parts by weight based on 100 parts by weight of the raw material rubber, because it improves the workability of the raw rubber.
The side wall rubber composition (1) of the present invention can prevent the discoloration of the sidewall portion by using no amine-based antioxidant or using less than 1 part by weight. In addition, by applying the
The
The anti-aging rubber sheet and the sidewall rubber composition are not limited to the side walls, but may be included in various rubber components constituting the tire. Examples of the rubber component include a tread, an apex, a chafer, a wire coat or an inner liner.
The tire according to another embodiment of the present invention can provide the above-mentioned
The tire according to another embodiment of the present invention may be a tire for a passenger car, a race tire, an airplane tire, an agricultural tire, an off-the road tire, a truck tire or a bus tire. The tire may be a radial tire or a bias tire, and more preferably a radial tire.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. However, the following embodiments are intended to illustrate the invention, but the present invention is not limited thereto.
[ Manufacturing example : Preparation of rubber composition]
The rubber compositions of Production Examples 1 to 3 were prepared using the compositions shown in Table 1 below. The rubber composition of Production Example 1 is a rubber composition for a side wall, and the rubber composition of Production Examples 2 and 3 is a rubber composition for protecting a sidewall from ozone. The production of the rubber composition is in accordance with a conventional method for producing a rubber composition, and is not particularly limited.
(Unit: parts by weight)
1) Natural rubber: TSR20 Grade
2) Butadiene rubber (BR): A butadiene rubber (BR1208 manufactured by LG Chemical) having a Tg (glass transition temperature) of -106 ° C,
3) Carbon black: N330
4) 6PPD: N-phenyl-N '- (1,3-dimethyl) -p-phenylenediamine (Kumanox-
5) RD: 2,2,4-trimethyl-1,2-dihydroquinoline (Vulkanox HS / LG by Lanxess)
6) WAX: Paraffin wax
7) Process oil: softener which is Treated Distillate Aromatic Extract (TDAE) oil
8) Vulcanization accelerator: TBBS (N-isobutyl-2-benzothiazyl sulfenamide)
[ Comparative Example ]
In the production of tires, the sidewall portions were manufactured using the rubber composition prepared in Production Example 1, and the carcass portion was manufactured using the rubber composition for carcass which was conventionally used.
[ Example One]
A rubber composition for protecting the tire sidewall prepared in Preparation Example 2 from ozone was added in a sheet form between a side wall portion containing the rubber composition prepared in Preparation Example 1 and a carcass portion to prepare a tire.
[ Example 2]
Between the side wall portion and the carcass portion including the rubber composition prepared in Preparation Example 1, a rubber composition for protecting the tire side wall produced in Production Example 3 from ozone was added in the form of a sheet to prepare a tire.
[ Experimental Example : tire Side part Ozone resistance evaluation]
Only the side portions of the tires of the comparative examples and the examples were cut to observe the degree of ozone cracking after aging at an ozone concentration of 50 pphm at a temperature of 40 ° C. The results are shown in Table 2 and compared.
Number of cracks: A <B <C
Crack size: 1 <2 <3 <4 <5
Blackness rating: 1st grade - little change in blackness
Grade 2 - slightly less black
Class 3 - Blackness changes noticeably
As in the results of Table 2, ozone resistance was significantly improved in Examples 1 and 2 in which an anti-aging rubber sheet containing an amine-type anti-aging agent was applied, as compared with Comparative Example in which only the side wall rubber composition was not applied And the degree of discoloration by the amine-based anti-aging agent remained at a level similar to that of the comparative example without the amine-based anti-aging agent.
As can be seen from Example 2, it was confirmed that when the content of RD is increased in the anti-aging rubber sheet, static ozone resistance is improved owing to the effect of increasing the migration of the amine antioxidant to the side wall rubber.
On the basis of the above results, it was confirmed that the content of the amine-type antioxidant causing discoloration in the side wall rubber composition was less than 2 parts by weight, Preferably 1 part by weight or less.
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, It belongs to the scope of right.
1: sidewall
2: Carcass
3: anti-aging rubber sheet
Claims (5)
Wherein the anti-aging rubber sheet comprises a rubber composition comprising 100 parts by weight of raw rubber, 20 to 60 parts by weight of carbon black, 2 to 5 parts by weight of an amine-based anti-aging agent and 2 to 3 parts by weight of a quinoline-
The sidewall does not include an amine-based antioxidant,
The amine antioxidant is N-phenyl-N '- (1,3-dimethyl) -p-phenylenediamine,
Wherein the quinoline antioxidant is 2,2,4-trimethyl-1,2-dihydroquinoline.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020150169826A KR101791889B1 (en) | 2015-12-01 | 2015-12-01 | Rubber composition for protecting a sidewall of tire against ozone and tire manufacturing by using the same |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020150169826A KR101791889B1 (en) | 2015-12-01 | 2015-12-01 | Rubber composition for protecting a sidewall of tire against ozone and tire manufacturing by using the same |
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| KR20170064267A KR20170064267A (en) | 2017-06-09 |
| KR101791889B1 true KR101791889B1 (en) | 2017-11-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190052923A (en) | 2017-11-09 | 2019-05-17 | 금호타이어 주식회사 | Tire Rubber Composition with Improved anti-Aging and anti-Stink Properties |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100333412B1 (en) | 2000-06-21 | 2002-04-25 | 조충환 | Tires having rubber layer enhanced anti-ozone crack at tread shoulder part |
| JP2006089028A (en) * | 2004-09-23 | 2006-04-06 | Goodyear Tire & Rubber Co:The | Tire having blowoutproof side wall |
| KR101392733B1 (en) * | 2012-11-29 | 2014-05-12 | 한국타이어 주식회사 | Rubber composition for tire sidewall and tire manufactured by using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100333412B1 (en) | 2000-06-21 | 2002-04-25 | 조충환 | Tires having rubber layer enhanced anti-ozone crack at tread shoulder part |
| JP2006089028A (en) * | 2004-09-23 | 2006-04-06 | Goodyear Tire & Rubber Co:The | Tire having blowoutproof side wall |
| KR101392733B1 (en) * | 2012-11-29 | 2014-05-12 | 한국타이어 주식회사 | Rubber composition for tire sidewall and tire manufactured by using the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190052923A (en) | 2017-11-09 | 2019-05-17 | 금호타이어 주식회사 | Tire Rubber Composition with Improved anti-Aging and anti-Stink Properties |
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| Publication number | Publication date |
|---|---|
| KR20170064267A (en) | 2017-06-09 |
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