KR20120059220A - Rubber composition for tire tread and tire manufactured by using the same - Google Patents
Rubber composition for tire tread and tire manufactured by using the same Download PDFInfo
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- KR20120059220A KR20120059220A KR1020100120877A KR20100120877A KR20120059220A KR 20120059220 A KR20120059220 A KR 20120059220A KR 1020100120877 A KR1020100120877 A KR 1020100120877A KR 20100120877 A KR20100120877 A KR 20100120877A KR 20120059220 A KR20120059220 A KR 20120059220A
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- rubber
- tire
- butadiene
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Classifications
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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
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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
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Abstract
Description
The present invention relates to a rubber tread rubber composition and a tire manufactured using the same, and to a tire tread rubber composition capable of improving braking performance and abrasion resistance on a wet road without deteriorating low fuel consumption performance, It's about tires.
Life cycle assessments are being introduced in all industries, reflecting the growing interest of both producers and consumers on environmental issues and their alternatives.
In addition, countries including Europe have shown the importance of eco-friendliness in the tire industry by labeling the low fuel consumption performance of tires, and classify and sell them according to their energy efficiency. Therefore, consumers in countries such as Europe and North America, which have high awareness of environmental problems and fuel economy, are expected to prefer energy-efficient tires.
However, when the tire is focused on low fuel efficiency among various required performances, there is a problem in improving wet performance of the wet road surface having a trade off relation. Therefore, in order to satisfy both the safety of the consumer and the eco-friendly viewpoint, research through various approaches is required, and various studies are currently in progress.
In general, it is easiest to increase the reinforcing filler in order to improve wet road braking property, but in this case, the low fuel consumption performance is lowered because the loss energy increases due to the coupling between the fillers.
SUMMARY OF THE INVENTION An object of the present invention is to provide a rubber composition for tire treads that can improve braking performance and wear resistance on wet road surfaces without degrading low fuel consumption performance.
Another object of the present invention is to provide a tire manufactured using the rubber tread rubber composition.
In order to achieve the above object, the rubber composition for tire tread according to an embodiment of the present invention is 50 to 70 parts by weight of the first solution-polymerized styrene-butadiene rubber containing 30 to 45 parts by weight of oil based on 100 parts by weight of the rubber component 50 to 70 parts by weight of the second solution-polymerized styrene-butadiene rubber containing 45 to 70 parts by weight of oil, and 20 to 30 parts by weight of neodymium butadiene rubber, and 100 parts by weight of high dispersibility. 90 to 110 parts by weight of silica.
Any one selected from the group consisting of the first solution-polymerized styrene-butadiene rubber, the second solution-polymerized styrene-butadiene rubber and combinations thereof has a styrene content of 30 to 50% by weight and a vinyl content of 20 to 40 in butadiene. Weight percent, a weight average molecular weight of 1,000,000 to 2,000,000 g / mol, a molecular weight distribution of 4 to 7, and a glass transition temperature of -40 to -20 ° C.
The neodymium butadiene rubber may have a glass transition temperature of −110 to −80 ° C. and a cis-1,4 butadiene content of 90 wt% or more.
The highly dispersible silica may have a nitrogen adsorption specific surface area of 160 to 180 m 2 / g and a CTAB adsorption specific surface area of 150 to 170 m 2 / g.
Tire according to another embodiment of the present invention is manufactured by using the rubber composition for the tire tread.
Hereinafter, the present invention will be described in more detail.
The rubber composition for the tire tread is 50 to 70 parts by weight of the first solution polymerized styrene-butadiene rubber including 30 to 45 parts by weight of oil based on 100 parts by weight of rubber component, and 45 to 70 parts by weight of oil based on 100 parts by weight of rubber component. 50 to 70 parts by weight of the second solution-polymerized styrene-butadiene rubber including 20 to 30 parts by weight of neodymium butadiene rubber, and 90 to 110 parts by weight of highly dispersible silica.
That is, the rubber composition for tire treads improves wet road surface braking performance by utilizing structural and physical properties of raw rubber, and maintains low fuel efficiency by reducing reinforcing fillers.
The raw material rubber includes 50 to 70 parts by weight of the first solution-polymerized styrene-butadiene rubber, 50 to 70 parts by weight of the second solution-polymerized styrene-butadiene rubber and 20 to 30 parts by weight of neodymium butadiene rubber.
In this case, the first solution-polymerized styrene-butadiene rubber contains 30 to 45 parts by weight of oil based on 100 parts by weight of rubber component, and the second solution-polymerized styrene-butadiene rubber is 45 to 70 parts by weight based on 100 parts by weight of rubber component. Contains minor oils. Since the second solution-polymerized styrene-butadiene rubber has a higher oil content than the first solution-polymerized styrene-butadiene rubber, the braking performance on wet roads is further improved, and a larger amount of silica can be filled in the rubber composition. The fall of the low fuel consumption performance by styrene butadiene rubber can be prevented.
Any one selected from the group consisting of the first solution-polymerized styrene-butadiene rubber, the second solution-polymerized styrene-butadiene rubber and combinations thereof has a styrene content of 30 to 50% by weight and a vinyl content of 20 to 40 in butadiene. Weight percent, a weight average molecular weight of 1,000,000 to 2,000,000 g / mol, a molecular weight distribution of 4 to 7, and a glass transition temperature of -40 to -20 ° C.
Solution-polymerized styrene-butadiene rubber having the above characteristics generally has a larger styrene structure than that of butadiene, so that high styrene content causes high hysteresis heat loss due to friction, thereby improving braking performance on wet road surfaces. In addition, the solution-polymerized styrene-butadiene rubber may preferably be polymerized by a continuous method, and the styrene-butadiene rubber polymerized by the continuous method is excellent in workability because of its wide molecular weight distribution.
The neodymium butadiene rubber may be preferably used without oil, the glass transition temperature is -110 to -80 ℃, the content of cis-1,4 butadiene may be 90% by weight or more. The neodymium butadiene rubber, which is made of a neodymium catalyst, has a narrower molecular weight distribution than the cobalt butadiene rubber or nickel butadiene rubber, and has a linear molecular structure, which is advantageous in rotation resistance due to low hysteresis heat loss.
The raw material rubber includes 50 to 70 parts by weight of the first solution-polymerized styrene-butadiene rubber, 50 to 70 parts by weight of the second solution-polymerized styrene-butadiene rubber and 20 to 30 parts by weight of the neodymium butadiene rubber. When the content of the first or second solution-polymerized styrene-butadiene rubber is 50 to 70 parts by weight, the wet road surface braking performance may be improved without lowering the fuel consumption performance, and when the content of the butadiene rubber exceeds 30 parts by weight, the cut-chipping The resistance may be lowered, and the wear resistance may be lowered if the butadiene rubber content is less than 20 parts by weight.
The highly dispersible silica has a nitrogen adsorption specific surface area (N 2 SA) of 160 to 180 m 2 / g and a CTAB (cetyl trimethyl ammonium bromide) adsorption specific surface area of 150 to 170 m 2 / g Can be used.
When the nitrogen adsorption specific surface area of the silica is less than 160 m 2 / g, reinforcing performance by silica as a filler may be detrimental and may not be referred to as highly dispersible silica, and when it exceeds 180 m 2 / g, processability of the rubber composition may be detrimental. . In addition, when the CTAB adsorption specific surface area of the silica is less than 150 m 2 / g, reinforcing performance by silica as a filler may be detrimental and may not be referred to as highly dispersible silica. Can be.
The silica may be included in 90 to 110 parts by weight based on 100 parts by weight of the raw material rubber. When the content of the silica is less than 90 parts by weight, the strength improvement of the rubber may be insufficient and the braking performance of the tire may be reduced. When the content of the silica exceeds 110 parts by weight, wear performance may be reduced.
The tire tread rubber composition may further include a coupling agent to improve dispersibility of silica. The coupling agent may include bis- (trialkoxy silyl propyl) polysulfide (TESPD), bis-3-triethoxy silylpropyl tetrasulfide (TESPT), and the like among the alkoxy polysulfide silane compounds. 50% by weight of black is mixed.
The coupling agent may be included in an amount of 10 to 20 parts by weight based on 100 parts by weight of the raw material rubber. When the content of the coupling agent is less than 10 parts by weight, the improvement of dispersibility of silica may be insufficient, and the workability of the rubber may be reduced or the low fuel consumption performance may be reduced. May be good but the braking performance may be very poor.
In addition, the rubber composition for the tire tread may further include a softener to impart plasticity to the rubber and to facilitate processing. As the softener, the total content of polycyclic aromatic hydrocarbons (hereinafter referred to as PAHs) is 3 wt% or less, the kinematic viscosity is 10 to 30 (at 100 ° C), and the aromatic component in the softener is 15 to 25. An environmentally friendly softener having a weight percent of 27 to 37 weight percent of the naphthenic component and 38 to 58 weight percent of the paraffinic component can be preferably used.
As the environmentally friendly softener, treated distillate aromatic extract (TDAE) oil, mild extraction solvate (MES) oil, residual aromatic extract (RAE) oil, solvent residual aromatic extract (SRAE) oil or heavy naphthenic oil may be preferably used.
In consideration of the properties of the raw material rubber, the softener can sufficiently improve the workability of the raw material rubber even when used in a small amount of 3 to 10 parts by weight based on 100 parts by weight of the raw material rubber.
In addition, the rubber composition for tire tread may use a sulfur-based vulcanizing agent as a vulcanizing agent. Examples of the sulfur-based vulcanizing agent include a vulcanizing agent for producing elemental sulfur or sulfur, for example, amine disulfide, polymer sulfur, and the like. The vulcanizing agent may be included in an amount of 0.5 to 2 parts by weight based on 100 parts by weight of the raw material rubber, thereby exhibiting an appropriate vulcanization effect, and may make the raw material rubber less sensitive to heat and chemically stable.
In addition, the rubber composition for tire tread is a vulcanization accelerator in amine (Amine), disulfide, guanidine, thio (urea), thiazole (thiazole), thiuram, sulfene amide (sulfene amide) The selected compound may further include 1 to 3 parts by weight based on 100 parts by weight of the raw material rubber.
In addition, the rubber composition for tire tread is N- (1,3-dimethylbutyl) -N'-phenyl-p-phenylenediamine (6PPD), N-phenyl-N'-isopropyl-p-phenyl as an anti-aging agent. Rendiamine (3PPD) or poly (2,2,4-trimethyl-1,2-dihydroquinoline) (RD) and the like may further comprise 5 to 10 parts by weight based on 100 parts by weight of the raw material rubber.
In addition to the above-mentioned composition, the rubber composition for tire tread may be used by selecting various additives such as zinc oxide, stearic acid or a processing aid, which are used in a general tire tread rubber composition.
The rubber composition for a tire tread can be produced through a conventional two-step continuous manufacturing process. That is, during the finishing step in which the first step of thermomechanical treatment or kneading at a maximum temperature ranging from 110 to 190 ° C., preferably from 130 to 180 ° C. and the crosslinking system is mixed, typically less than 110 ° C., for example It can be prepared in a suitable mixer using a second step of mechanical treatment at a low temperature of 40 to 100 ℃, but the present invention is not limited thereto.
The rubber composition for the tire tread is not limited to the tread (tread cap and tread base), and may be included in various rubber components constituting the tire. Such rubber components include sidewalls, sidewall inserts, apex, chafers, wire coats or innerliners, and the like.
A tire according to another embodiment of the present invention is manufactured using the rubber tread rubber composition. The method of manufacturing a tire using the tire tread rubber composition may be applied to any method conventionally used for the production of tires, and thus, detailed description thereof will be omitted.
The tire may be a passenger car tire, a racing tire, an airplane tire, a farm tire, an off-the-road tire, a truck tire or a bus tire. In addition, the tire may be a radial tire or a bias tire, and is preferably a radial tire.
The rubber composition for tire treads of the present invention can improve braking performance and wear resistance on wet road surfaces without degrading low fuel consumption performance.
Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.
[Production Example: Production of Rubber Composition]
Using a composition as shown in Table 1 below to prepare a rubber composition for tire treads according to the following examples and comparative examples. The rubber composition was prepared according to a conventional method for preparing a rubber composition.
40
40
(80)
40
40
40
40
40
40
1) S-SBR (1): A solution-polymerized styrene-butadiene rubber prepared by a continuous process having a styrene content of 25% by weight, a vinyl content of 66% by weight in butadiene and a glass transition temperature of -25 ° C. ), Including 37.5 parts by weight of TDAE oil with respect to 100 parts by weight of rubber component (the numbers in parentheses are parts by weight of rubber component excluding oil content).
2) S-SBR (2): solution-polymerized styrene-butadiene rubber (SBR) prepared by a continuous process having a styrene content of 38% by weight, a vinyl content of 24% by weight of butadiene and a glass transition temperature of -33 ° C. ), Including 37.5 parts by weight of TDAE oil with respect to 100 parts by weight of rubber component (the numbers in parentheses are parts by weight of rubber component excluding oil content).
3) S-SBR (3): solution polymerized styrene-butadiene rubber (SBR) prepared by a continuous process having a styrene content of 40% by weight, a vinyl content of 28% by weight of butadiene and a glass transition temperature of -31 ° C. ), Including 50 parts by weight of SRAE oil (numbers in parentheses are parts by weight of rubber except oil).
4) BR: Butadiene rubber having a cis-1,4 butadiene content of 96% by weight and made of a neodymium catalyst.
5) Silica: Precipitated silica having a nitrogen adsorption specific surface area of 175 m 2 / g and a CTAB adsorption specific surface area of 160 m 2 / g.
6) Coupling agent: Tetrasulfide silane.
7) Processed oil: total content of PolyCyclic Aromatic Hydocarbo (PAH) component is 3 wt% or less, kinematic viscosity 10 to 30 (at 100 ° C), 25 wt% aromatic component in oil, 32.5 wt% naphthenic component, and Oil having a paraffinic component of 47.5% by weight.
Experimental Example: Measurement of Physical Properties of Prepared Rubber Composition
The Mooney viscosity, hardness, 300% modulus, viscoelasticity, and the like of the rubber specimens prepared in Examples and Comparative Examples were measured based on ASTM-related regulations, and the results are shown in Table 2 below.
The pattern viscosity (ML1 + 4 (125 ° C.)) was measured according to ASTM standard D1646. The Mooney viscosity is a value representing the viscosity of the unvulcanized rubber, and the lower the value, the better the workability of the unvulcanized rubber.
Hardness was measured according to DIN 53505. Hardness indicates steering stability. The higher the value, the better the steering stability.
300% modulus and breaking energy were measured according to ISO 37. The breaking energy indicates the energy required when the rubber is broken. The higher the value, the higher the required energy and excellent wear performance.
-Viscoelasticity was measured by GAS, G ", tanδ from -60 ° C to 60 ° C at 10Hz frequency at 0.5% strain using ARES meter. 0 ° C tanδ was applied to dry or wet roads. The higher the value, the better the braking performance, and 60 ° C tanδ represents the rolling resistance, and the lower the value, the better the performance.
In addition, a tire of a 205 / 55R16 standard made of a tread with the rubber composition of the comparative examples and examples and including the tread rubber as a semi-finished product was prepared, and the relative ratio of the braking distance and the rolling resistance on the wet road surface for the tire was Table 3 shows.
Referring to Tables 2 and 3 above, in the case of using a solution-polymerized styrene-butadiene rubber having a high content of styrene and oil and having a wide molecular weight distribution, even when the reinforcing filler is reduced, the rotational resistance is equal to or higher than that on the wet road. It can be seen that the braking performance has improved. In addition, it can be seen that the braking performance on the wet road surface becomes disadvantageous when the reinforcing filler is reduced more than appropriate.
Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.
Claims (5)
50 to 70 parts by weight of a second solution polymerized styrene-butadiene rubber comprising 45 to 70 parts by weight of oil, based on 100 parts by weight of rubber component, and
Neodymium Butadiene Rubber 20-30 parts by weight
Raw material rubber containing 100 parts by weight, and
90 to 110 parts by weight of highly dispersible silica
Rubber composition for a tire tread comprising a.
Any one selected from the group consisting of the first solution-polymerized styrene-butadiene rubber, the second solution-polymerized styrene-butadiene rubber, and combinations thereof has a styrene content of 30 to 50% by weight, and a vinyl content of butadiene is 20 to 40 A rubber composition for tire tread, wherein the rubber composition for the tire tread is weight%, the weight average molecular weight is 1,000,000 to 2,000,000 g / mol, the molecular weight distribution is 4 to 7, and the glass transition temperature is -40 to -20 ° C.
The neodymium butadiene rubber has a glass transition temperature of -110 to -80 ℃, the content of cis-1,4 butadiene is 90% by weight or more rubber composition for tire tread.
The highly dispersible silica has a nitrogen adsorption specific surface area of 160 to 180 m 2 / g, CTAB adsorption specific surface area of 150 to 170 m 2 / g rubber composition for tire tread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100120877A KR101315118B1 (en) | 2010-11-30 | 2010-11-30 | Rubber composition for tire tread and tire manufactured by using the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100120877A KR101315118B1 (en) | 2010-11-30 | 2010-11-30 | Rubber composition for tire tread and tire manufactured by using the same |
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| Publication Number | Publication Date |
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| KR20120059220A true KR20120059220A (en) | 2012-06-08 |
| KR101315118B1 KR101315118B1 (en) | 2013-10-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101496242B1 (en) * | 2013-01-08 | 2015-02-26 | 한국타이어 주식회사 | Rubber composition for tire tread and tire manufactured by using the same |
| KR20220161763A (en) * | 2021-05-31 | 2022-12-07 | 한국타이어앤테크놀로지 주식회사 | Rubber composition for tire tread and tire manufactured by using the same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100339042B1 (en) | 1999-08-13 | 2002-05-31 | 신형인 | Tread Rubber Composition for Tire |
| KR100715718B1 (en) * | 2005-06-22 | 2007-05-08 | 금호타이어 주식회사 | Pcr tread compound for pneumatic tire |
| KR100776769B1 (en) * | 2006-12-20 | 2007-11-28 | 한국타이어 주식회사 | Rubber composition for tire tread for an automobile |
| KR20090070850A (en) * | 2007-12-27 | 2009-07-01 | 한국타이어 주식회사 | Rubber composition for tire tread |
-
2010
- 2010-11-30 KR KR1020100120877A patent/KR101315118B1/en active IP Right Grant
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101496242B1 (en) * | 2013-01-08 | 2015-02-26 | 한국타이어 주식회사 | Rubber composition for tire tread and tire manufactured by using the same |
| KR20220161763A (en) * | 2021-05-31 | 2022-12-07 | 한국타이어앤테크놀로지 주식회사 | Rubber composition for tire tread and tire manufactured by using the same |
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| Publication number | Publication date |
|---|---|
| KR101315118B1 (en) | 2013-10-07 |
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