KR101737022B1 - Rubber composition having improved grip for high speed tire tread - Google Patents
Rubber composition having improved grip for high speed tire tread Download PDFInfo
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- KR101737022B1 KR101737022B1 KR1020150163088A KR20150163088A KR101737022B1 KR 101737022 B1 KR101737022 B1 KR 101737022B1 KR 1020150163088 A KR1020150163088 A KR 1020150163088A KR 20150163088 A KR20150163088 A KR 20150163088A KR 101737022 B1 KR101737022 B1 KR 101737022B1
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- rubber
- rubber composition
- weight
- tire
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Classifications
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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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- 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
- B60C1/0016—Compositions of the tread
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- C08L23/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
Abstract
Description
[0001] The present invention relates to a rubber composition for a high-speed running tire tread having improved grip properties, and more particularly, to a rubber composition for a high-speed running tire tread having improved gripability and a liquid phase polybutene which does not react with carbon black during vulcanization, To a rubber composition for a high-speed running tire tread capable of maintaining a high-molecular-weight chain length during a process to maintain a heat-generating performance and to improve grip performance of a tire, thereby enabling high-speed traveling.
Tires combine compound semifinished products of various properties to fulfill the unique role required for each part. Among them, the tread portion contacting with the road surface must have the elastic property to absorb and mitigate the impact generated according to the road surface shape, and the wear due to the friction with the road surface due to traction, driving, and braking must be minimized.
Further, the high-speed driving tire can evaluate its performance with a high gripping force for exerting an excellent steering limiting performance on a combed road and a dry road surface.
The tire curing process is the final step for the manufacture of tires. The curing process is a process of obtaining the physical properties and shape of a desired tire through a cross-linking reaction between a rubber and a sulfur, which occurs when a molded green case is heated in a vulcanizer It is the process of putting out.
In the vulcanizer, heat transfer occurs through a heated metal mold attached to the outside of the tire and a rubber bladder attached to the inside of the tire by the high-temperature pressurized fluid. In this process, The time-temperature curve of the product is a key factor determining the state of cure and productivity that are directly related to product quality.
Because the physical properties of the rubber are not permanent properties, things like sunlight, oxygen, ozone, heat, high humidity, radiation, etc., take away the initial good properties of rubber compounds.
Other factors that degrade rubber products are exposure to fluids such as various fuels, oils, solvents, refrigerants, acids, alkalis, and the like. Therefore, the reaction to the factors affecting deterioration greatly varies depending on the type of raw material rubber and the compounding agent.
In the related art, a tire tread rubber composition comprising a raw rubber, a rubber compounding agent, and a highly reactive polybutene whose position of a carbon-carbon double bond is mainly located at the end (Japanese Patent Application Laid-Open No. 10-2011-0072253) Lt; / RTI >
In addition, Japanese Laid-Open Patent Publication No. 10-2012-0038235 discloses a tire inner liner rubber composition comprising a raw rubber and liquid polybutene (Patent Publication No. 10-2012-0038235).
However, in the above-mentioned prior arts, the external vibration applied on the road surface causes friction between the bulky group of the polymer and the other non-bonding group, thereby causing the heating of the tire tread. When the reaction occurs between the carbon black and the polymer, the polymer chain is broken and the heat generating performance may be deteriorated.
Accordingly, there is a desperate need to develop a high-speed running tire tread rubber composition comprising a rubber material resistant to a specific reaction, because the rubber may become unusable in a very short time under the bad condition of a vulcanization process.
SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the prior art as described above, and it is an object of the present invention to provide a vulcanizable rubber composition which is capable of reducing the gripping force of a rubber composition due to a decrease in exothermic performance caused by a chemical reaction between a carbon black and a polymer in a compound composition And a rubber composition for a high-speed running tire tread.
In order to achieve the above object, the present invention provides an improved tire tread rubber composition comprising 5 to 10 parts by weight of liquid polybutene per 100 parts by weight of raw rubber.
Further, the present invention provides a tire comprising a rubber composed of the rubber composition having improved grip.
According to the present invention, the heat generation performance and the grip performance of the rubber composition for a tire tread can be improved by reducing the chemical reaction occurring between the carbon black and the polymer in the vulcanization process.
The present invention relates to a tire tread rubber composition comprising 5 to 10 parts by weight of liquid polybutene per 100 parts by weight of a raw rubber.
In the rubber composition for a tire of the present invention, if the amount of the liquid polybutene is less than 5 parts by weight based on 100 parts by weight of the raw material rubber, the improvement in grip property may not be exhibited. If the amount is more than 10 parts by weight, The cost burden can be increased without increasing the effect.
In the tire tread rubber composition of the present invention, the weight average molecular weight of the liquid polybutene may be 2100 to 2500.
In the tire tread rubber composition of the present invention, the liquid polybutene serves to lower the viscosity of the rubber compound, to increase the adhesive strength, to act as a process oil, but to act as a rubber after vulcanization to strengthen the mechanical properties . Therefore, the liquid polybutene can be applied to a high-strength rubber design which is difficult to use a process oil.
In the tire tread rubber composition of the present invention, the glass transition temperature of the rubber composition may be -2.5 ° C to -2 ° C.
In the tire tread rubber composition of the present invention, the 22 ° C tan value of the rubber composition may be 0.345 to 0.350.
In the tire tread rubber composition of the present invention, the 0 DEG C tan value of the rubber composition may be 0.575 to 0.590.
In the rubber composition for a tire of the present invention, the starting rubber may be at least one selected from the group consisting of natural rubber and synthetic rubber, but synthetic rubber is preferable.
In the rubber composition for a tire of the present invention, the kind of the synthetic rubber is not particularly limited, and examples thereof include styrene butadiene rubber, butadiene rubber, butyl rubber, emulsion polymerized styrene butadiene rubber (E-SBR) (S-SBR), epichlorohydrin rubber, nitrile rubber, hydrogenated nitrile rubber, brominated polyisobutyl isoprene-co-paramethyl styrene (BIMS) rubber, urethane There may be mentioned rubber, fluorine rubber, silicone rubber, styrene ethylene butadiene styrene copolymer rubber, ethylene propylene rubber, ethylene propylene diene monomer rubber, hyaluron rubber, chloroprene rubber, ethylene vinyl acetate rubber and acrylic rubber.
The rubber composition for a tire of the present invention may further comprise 100 to 150 parts by weight of carbon black per 100 parts by weight of the raw rubber.
In the rubber composition for a tire of the present invention, if the content of the carbon black is less than 100 parts by weight, the reinforcing performance by the carbon black as a filler may be deteriorated, and if it exceeds 150 parts by weight, the workability of the rubber composition may be deteriorated.
In the rubber composition for a tire of the present invention, the carbon black preferably has a rating of 500 to 600 in terms of heat generation performance. Typical examples thereof include N110, N121, N134, N220, N231, N234, N242, N293, N299, N357, N539, N550, N582, N630, N642, N650, N660, N683, N754, N762, N765, N774, N787, N907, N908, N990, N991, and the like, but the present invention is not limited thereto.
In the rubber composition for a tire of the present invention, the silica has a specific surface area (BET) of 100 to 200 m 2 / g, preferably 110 to 150 m 2 / g, more preferably 110 to 120 m 2, / g. < / RTI >
In the rubber composition for a tire of the present invention, the silica is used as a reinforcing material for a tire rubber composition and may have a specific surface area of 100 to 200 m 2 / g. When it is less than 100 m 2 / g, , The process efficiency may be poor and the abrasion performance may be deteriorated. On the other hand, when it exceeds 200 m < 2 > / g, the specific surface area increases and the viscosity of the rubber compound increases, It can cause problems.
In the rubber composition for a tire of the present invention, the silane coupling agent is not particularly limited, and examples thereof include bis- (3-triethoxysilylpropyl) -tetrasulfane; TESPT ), Bis- (3-ethoxysilylpropyl) disulfane (ESPD), N- [2 (vinylbenzylamino) -3-aminopropyltrimethoxysilane (N- [ 2 (vinylbenzylamino) -aminopropyltrimethoxysilane), and the like.
In the rubber composition for a tire of the present invention, the tire may be referred to as a pneumatic tire. Specifically, the tire may be a passenger car, an SUV, a bus, a truck, and the like, but is not particularly limited.
The rubber composition for a tire of the present invention may contain conventional additives for rubber compositions such as an antioxidant, zinc oxide, stearic acid, a vulcanizing agent, a vulcanization accelerator, an activator and the like, but is not limited thereto.
In the rubber composition for a tire of the present invention, as the vulcanizing agent, it is possible to use an organic peroxide or a sulfur vulcanizing agent. Examples of the organic peroxide include benzoyl peroxide, dicumyl peroxide, di- Dimethyl-2,5-di (t-butylperoxy) hexane, 2,5-dimethyl-2,5- Di (t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) Butyl peroxybenzene, 2,4-dichlorobenzoyl peroxide, 1,1-di-t-butylperoxy-3,3,5-trimethylsiloxane, n-butyl- , 4-di-t-butylperoxy valerate, and the like.
Of these, dicumyl peroxide, t-butylperoxybenzene and di-t-butylperoxy-diisopropylbenzene are preferable. As the sulfur vulcanizing agent, for example, sulfur, morpholine disulfide and the like can be used. Of these, sulfur is preferable. These vulcanizing agents may be used alone or in combination of two or more.
In the rubber composition for a tire of the present invention, the vulcanization accelerator may be a vulcanization accelerator such as a sulfenamide type, a thiazole type, a thiuram type, a thiourea type, a guanidine type, a dithiocarbamate type, an aldehyde-amine type or an aldehyde- Or a xanthate vulcanization accelerator may be used as the vulcanization accelerator.
Examples of the sulfenamide system include CBS (N-cyclohexyl-2-benzothiazylsulfenamide), TBBS (N-tert-butyl-2-benzothiazylsulfenamide), N, N-dicyclohexyl- Sulfinamide compounds such as benzothiazyl sulfenamide, N-oxydiethylene-2-benzothiazyl sulfenamide and N, N-diisopropyl-2-benzothiazole sulfenamide.
Examples of the thiazole system include MBT (2-mercaptobenzothiazole), MBTS (dibenzothiazyl disulfide), sodium salt of 2-mercaptobenzothiazole, zinc salt, copper salt, cyclohexylamine salt, 2- Thiazole-based compounds such as (2,4-dinitrophenyl) mercaptobenzothiazole and 2- (2,6-diethyl-4-morpholinothio) benzothiazole.
As the thiuram series, there may be mentioned, for example, TMTD (tetramethylthiuram disulfide), tetraethylthiuram disulfide, tetramethylthiuram monosulfide, dipentamethylenethiuram disulfide, dipentamethylenethiuram monosulfide, dipentamethylenethiuramtetra Thiuram-based compounds such as sulfide, dipentamethylenethiuram hexasulfide, tetrabutylthiuram disulfide, and pentamethylenethiuram tetrasulfide can be used.
Examples of the thiourea compound include thiourea compounds such as thiacarbamide, diethyl thiourea, dibutyl thiourea, trimethyl thiourea, and diorthotolyl thiourea.
Examples of the guanidine system include guanidine compounds such as diphenyl guanidine, diorthotolyl guanidine, triphenyl guanidine, orthotolyl biguanide, and diphenyl guanidine phthalate.
Examples of the dithiocarbamic acid system include zinc ethylphenyldithiocarbamate, zinc butylphenyldithiocarbamate, sodium dimethyldithiocarbamate, zinc dimethyldithiocarbamate, diethyldithiocarbamate Zinc, zinc dibutyldithiocarbamate, zinc diamidithiocarbamate, zinc dipropyldithiocarbamate, complex salt of zinc and piperidine dicarboxylate, hexadecyl (or octadecyl ) Zinc isopropyldithiocarbamate, zinc dibenzyldithiocarbamate, sodium diethyldithiocarbamate, piperidine pentamethylene dithiocarbamate, selenium dimethyldithiocarbamate, diethyldithiocarbamate, Dithiocarbamate-based compounds such as tellurium oxcarbamate and cadmium diadimethyldithiocarbamate, and the like can be used.
Examples of the aldehyde-amine type or aldehyde-ammonia type include aldehyde-amine type or aldehyde-ammonia type compounds such as acetaldehyde-aniline reactant, butylaldehyde-aniline condensate, hexamethylenetetramine and acetaldehyde- Can be used.
As the imidazoline-based compound, for example, an imidazoline-based compound such as 2-mercaptoimidazoline can be used. As the xanthate-based compound, for example, a xanthate-based compound such as zinc dibutylxanthogenate can be used .
As the vulcanization accelerating assistant, for example, zinc oxide, stearic acid and the like can be used.
These vulcanization accelerators may be used alone or in combination of two or more.
The rubber composition for a tire according to the present invention may be prepared by mixing the raw rubber and additives such as silica and silane coupling agent in a Banbury mixer at a temperature of 145 to 165 캜 and then heating the mixture at a temperature of 145 to 160 캜 For 25 minutes to 40 minutes, so that detailed description of the production method will be omitted.
The present invention also relates to a tire comprising the rubber composition. The tires of the present invention can be produced by a usual method, as the above-described rubber composition for a tire can be used to produce a tire, as long as it is a conventional method for producing a tire within the range of using the rubber composition .
Hereinafter, the present invention will be described in more detail with reference to the following examples and comparative examples. The following examples are merely examples for carrying out the present invention and are not intended to limit the scope of protection of the present invention.
≪ Example 1 >
, 120 parts by weight of carbon black, 5 parts by weight of liquid polybutene, 5 parts by weight of a polyolefin-based resin, and 100 parts by weight of a raw rubber composed of 30 parts by weight of an emulsion-polymerized styrene butadiene rubber (E-SBR) and 70 parts by weight of a solution- 6 parts by weight of zinc, 2 parts by weight of stearic acid and 2 parts by weight of an antioxidant (N- (1,3-dimethylbutyl) -N'-phenyl-p-phenylenediamine (Kumanox-13)) were added to a Banbury mixer And the mixture was blended at 140 DEG C for 3 minutes to obtain a blend.
1.5 parts by weight of sulfur as a vulcanizing agent was added to the above mixture, and vulcanized at 160 DEG C for 15 minutes to prepare a rubber specimen. Table 1 below summarizes the above rubber compositions.
≪ Example 2 >
A rubber specimen was prepared in the same manner as in Example 1 except that 10 parts by weight of liquid polybutene was used.
≪ Comparative Example 1 &
120 parts by weight of carbon black, 6 parts by weight of zinc oxide, 2 parts by weight of stearic acid 2 (S-SBR) were added to 100 parts by weight of raw rubber composed of 30 parts by weight of emulsion polymerized styrene butadiene rubber (E-SBR) and 70 parts by weight of solution- And 2 parts by weight of an antioxidant (N- (1,3-dimethylbutyl) -N'-phenyl-p-phenylenediamine (Kumanox-13)) were added to a Banbury mixer, Min to obtain a blend.
1.5 parts by weight of sulfur as a vulcanizing agent was added to the above mixture, and vulcanized at 160 DEG C for 15 minutes to prepare a rubber specimen. Table 1 below summarizes the above rubber compositions.
≪ Comparative Example 2 &
Rubber specimens were prepared in the same manner as in Comparative Example 1 except that 5 parts by weight of liquid styrene butadiene rubber (liquid SBR) was further added to 100 parts by weight of the raw rubber.
≪ Comparative Example 3 &
Rubber specimens were prepared in the same manner as in Comparative Example 1 except that 10 parts by weight of the liquid styrene-butadiene rubber was further added to 100 parts by weight of the raw rubber.
1) Liquid polybutene: Daelim Industrial, HR-2300
2) Liquid SBR: Kuraray, L-SBR-841
<Test Example>
The rubber specimens of Examples 1 to 2 and Comparative Examples 1 to 3 were measured for glass transition temperature (Tg), dry grip on wet road surface and wet grip on dry road surface according to ASTM standard The physical properties were measured, and the results are shown in Table 2 below.
In the following Table 2, Tg is a glass transition temperature, and when the Tg is high, it is easy to exhibit the grip performance at a normal driving environment temperature.
In addition, 22 deg. Tan < RTI ID = 0.0 > tan < / RTI > is a measure of the grip performance on a dry road surface.
In addition, 0 deg. Tan delta is a measure of wet grip on a wet road surface, meaning that the higher the value, the better.
As shown in the results of Table 2, the rubber specimens of Examples 1 and 2, in which the liquid polybutene of the present invention was added, were compared with those of Comparative Example 1 in which liquid polybutene was not added, It can be seen that Tg is increased in comparison with the rubber specimens of Examples 2 and 3.
As shown in the results of Table 2, the rubber specimens of Examples 1 to 2, in which the liquid polybutene of the present invention was added, were different from those of Comparative Example 1 in which liquid polybutene was not added, The grip performance on the wet road surface and the grip performance on the dry road surface are superior to those of the rubber specimens of Comparative Examples 2 and 3,
The tire tread rubber composition according to the present invention can improve the heating performance and the grip performance of the rubber composition for tire tread by reducing the chemical reaction occurring between the carbon black and the polymer in the vulcanization process, And it is industrially applicable.
Claims (5)
Wherein the rubber composition has a glass transition temperature of -2.5 캜 to -2 캜.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150163088A KR101737022B1 (en) | 2015-11-20 | 2015-11-20 | Rubber composition having improved grip for high speed tire tread |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150163088A KR101737022B1 (en) | 2015-11-20 | 2015-11-20 | Rubber composition having improved grip for high speed tire tread |
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| KR101737022B1 true KR101737022B1 (en) | 2017-05-17 |
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| KR1020150163088A KR101737022B1 (en) | 2015-11-20 | 2015-11-20 | Rubber composition having improved grip for high speed tire tread |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021132822A1 (en) * | 2019-12-24 | 2021-07-01 | 한화토탈 주식회사 | Method for preparing rubber composition, rubber composition prepared thereby, and tire manufactured using same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008255168A (en) * | 2007-04-02 | 2008-10-23 | Sumitomo Rubber Ind Ltd | Rubber composition for tire tread and pneumatic tire having tread produced by using the same |
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2015
- 2015-11-20 KR KR1020150163088A patent/KR101737022B1/en active IP Right Grant
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008255168A (en) * | 2007-04-02 | 2008-10-23 | Sumitomo Rubber Ind Ltd | Rubber composition for tire tread and pneumatic tire having tread produced by using the same |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021132822A1 (en) * | 2019-12-24 | 2021-07-01 | 한화토탈 주식회사 | Method for preparing rubber composition, rubber composition prepared thereby, and tire manufactured using same |
| CN114829460A (en) * | 2019-12-24 | 2022-07-29 | 韩华道达尔有限公司 | Method for preparing rubber composition, rubber composition prepared by the method and tire manufactured by the method |
| JP7422878B2 (en) | 2019-12-24 | 2024-01-26 | ハンファ トタルエナジーズ ペトロケミカル カンパニー リミテッド | A method for producing a rubber composition, a rubber composition produced by the method, and a tire produced using the same |
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