KR20160002457A - Tire tread rubber composition and tire comprising the same - Google Patents

Tire tread rubber composition and tire comprising the same Download PDF

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Publication number
KR20160002457A
KR20160002457A KR1020140080622A KR20140080622A KR20160002457A KR 20160002457 A KR20160002457 A KR 20160002457A KR 1020140080622 A KR1020140080622 A KR 1020140080622A KR 20140080622 A KR20140080622 A KR 20140080622A KR 20160002457 A KR20160002457 A KR 20160002457A
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KR
South Korea
Prior art keywords
weight
rubber
parts
tire
rubber composition
Prior art date
Application number
KR1020140080622A
Other languages
Korean (ko)
Inventor
김지원
Original Assignee
금호타이어 주식회사
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Application filed by 금호타이어 주식회사 filed Critical 금호타이어 주식회사
Priority to KR1020140080622A priority Critical patent/KR20160002457A/en
Publication of KR20160002457A publication Critical patent/KR20160002457A/en

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Classifications

    • 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
    • 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
    • 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
    • C08L15/00—Compositions of rubber derivatives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L45/00—Compositions of homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic ring system; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L7/00—Compositions of natural rubber
    • 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

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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)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)

Abstract

The present invention relates to a rubber composition for a tire tread capable of improving wear performance, rotational resistance performance, and traction performance, in particular, wet traction and ice sheet braking characteristics on wet road surfaces such as snow, ice sheets and water.

Description

TECHNICAL FIELD [0001] The present invention relates to a rubber composition for a tire tread,

The present invention relates to a rubber composition for a tire tread and a tire using the rubber composition. More particularly, the present invention relates to a rubber composition for a tire tread and a tire using the rubber composition for a tire tread. A rubber composition for a tire tread, and a tire using the rubber composition.

Recently, global warming and energy depletion problems have been raised in various countries, and the automobile industry is also developing a low fuel consumption vehicle to which environmentally friendly technology is applied in such a circumstance. In the process of developing such environmentally friendly technologies, the development of fuel efficiency and braking performance of vehicles is also intensifying with each manufacturer. As the number of consumers looking for high-performance vehicles increases with good fuel economy, tires made of silica as a filler are being produced to meet these performance. In addition, by applying silica as a filler to tires, The braking performance and the low rotational resistance performance are improved.

The high abrasion performance reduces the tire replacement cycle and the low rolling resistance performance reduces the fuel consumption of the vehicle, which is economical for the consumer. In the case of a braking performance, a tire having a good wet traction on a wet tire increases the safety of an accident when the vehicle suddenly stops, and it is possible to easily control the movement of the vehicle on the snow, the comb, and the ice sheet surface.

Among the characteristics of the tire tread as described above, the braking force characteristics must be good in terms of safety of the driver and ease of driving the vehicle. Therefore, much research has been conducted to improve such characteristics.

In the case of the conventional technology, a rubber composition having a low temperature glass transition temperature is generally prepared by using rubber of 10 to 20 parts by weight of natural rubber and 30 to 50 parts by weight of butadiene rubber. However, Due to its low temperature dynamic viscoelastic properties, there are disadvantages in terms of low temperature handling characteristics and water film sliding resistance wear coefficients.

As a prior art related to the present invention, Korean Patent Laid-Open Publication No. 2010-0118501 discloses a tungsten or cemented carbide having a particle size of 0.01 to 5 mm with respect to 100 parts by weight of a rubber base material, artificial diamond, cbn, corundum, And 5 to 90 parts by weight of an anti-slip particles composed of one of the anti-slip particles are mixed to improve the anti-slip performance.

In addition, Korean Patent Laid-Open Publication No. 2010-0099517 discloses a rubber composition for a tire tread, which includes a tube-shaped nano clay, and has a wet surface due to the spike effect and the capillary effect of the tube- To improve wet traction and rotational resistance characteristics on wet road surfaces such as snow, ice sheets, and / or water.

However, when the above-described prior arts are applied, there is a problem that the compatibility of the particles in the rubber composition with the rubber is lowered, and thus there is a limitation in improving the tire performance.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a motor vehicle capable of improving wet traction and ice sheet braking, wear and rotation resistance characteristics on a wet road surface such as an eye, A rubber composition for a tire tread, and a tire using the same.

The rubber composition for a tire tread according to the present invention is a modified styrene butadiene rubber having a weight average molecular weight (Mw) of 1,000,000 to 1,500,000, a styrene content of 35 to 50% by weight and a vinyl content of 45 to 65% by weight 10 to 40 parts by weight of a styrene-butadiene rubber (hereinafter also referred to as rubber A) having a weight average molecular weight (Mw) of 200,000 to 300,000, a styrene content of 10 to 20% by weight and a vinyl content of 25 to 35% (Hereinafter also referred to as rubber B) of 50 to 70 parts by weight of silica and 1 to 10 parts by weight of carbon black with respect to 100 parts by weight of a raw rubber comprising 40 to 60 parts by weight of a natural rubber and 5 to 50 parts by weight of a natural rubber.

The rubber composition for a tire tread according to the present invention preferably has a weight average molecular weight (Mw) of 1,000,000 to 1,500,000, a styrene content of 35 to 50% by weight and a vinyl content of 45 to 65% When the molecular weight (Mw) is within the above range, the dispersibility of the filler is improved when the filler is mixed with silica, and the effect of improving the abrasion performance when the tire is traveled is preferable. When the content of styrene and vinyl is within the above range, It is preferable because it has excellent gripping force.

The rubber composition for a tire tread according to the present invention preferably has a weight average molecular weight (Mw) of 200,000 to 300,000, a styrene content of 10 to 20% by weight and a vinyl content of 25 to 35% (Mw) within the above-mentioned range, it is preferable that an appropriate abrasion performance is exhibited. If the content of styrene and vinyl is within the above range, excellent low-temperature characteristics are preferable.

In the rubber composition for a tire tread according to the present invention, it is preferable that the raw material rubber is composed of 10 to 40 parts by weight of the raw rubber A, 40 to 60 parts by weight of the raw rubber B and 5 to 50 parts by weight of the natural rubber, When the content of the raw rubber A is lower than the above range, the grounding ability of the road is lowered, and when the content is high, the styrene content is high, which lowers the uniformity of the rubber compound and increases the glass transition temperature.

In the rubber composition for a tire tread according to the present invention, the silica may have a BET surface area of 90 to 140 m 2 / g and a CTAB surface area of 90 to 100 m 2 / g, and the silica content may be 100 parts by weight But if it is less than 50 parts by weight, the thermal hysteresis deteriorates and it is not preferable to improve the folding power. If it exceeds 70 parts by weight, the abrasion performance is deteriorated beyond the proper abrasion level, which is not preferable.

In the rubber composition for a tire tread according to the present invention, it is preferable that the content of the carbon black is 1 to 10 parts by weight based on 100 parts by weight of the raw rubber. If it is less than 1 part by weight, , The modulus suddenly increases, which lowers the grounding force on the snow and ice sheet road surface, which is undesirable.

The glass transition temperature of the rubber composition for a tire tread according to the present invention is preferably from -40 to -25 DEG C, and if it is within the above range, a microscopic partial crystallization transition state occurs in the tread portion of the tire due to the effect of high styrene and vinyl structure , And the spike effect of the rubber itself enhances power on wet road surfaces such as snow, ice, and water.

The rubber composition of the present invention may further contain conventional additives added to general tread rubber compositions such as conventional silane coupling agents, zinc oxide, stearic acid, antioxidants, vulcanizing agents and vulcanization accelerators.

The tire according to the present invention has a tread portion made of the rubber composition for a tire tread according to the present invention.

According to the present invention, it is possible to provide a rubber composition for a tire tread and a tire having an effect of improving wear performance, traction performance, and snow performance.

When the rubber composition for a tire tread according to the present invention is applied to the tread area of a four-season tire, it is possible to improve the handling performance of the slip during the winter driving and the handling of the ice sheet road. In the case of snow tires, Driving stability and maneuverability can be improved.

Hereinafter, the present invention will be described in more detail with reference to the following examples and comparative examples. The following examples are only illustrative of the present invention and do not limit the scope of protection of the present invention.

< Example  1>

30 parts by weight of a modified styrene butadiene rubber (raw material rubber A) having a weight average molecular weight (Mw) of 1,015,000, a styrene content of 40% by weight and a vinyl content of 65% by weight and a weight average molecular weight ) Of 250,000, a styrene content of 15% by weight, a vinyl styrene content of 30% by weight, 55 parts by weight of a modified styrene butadiene rubber (raw material rubber B) and 15 parts by weight of natural rubber, , 4.3 parts by weight of a silane coupling agent, 8 parts by weight of carbon black, 3 parts by weight of zinc oxide, 2 parts by weight of stearic acid, and N- (1,3-dimethylbutyl) -N'- Were weighed into a Banbury mixer and blended to obtain a rubber blend. 1.4 parts by weight of sulfur as a vulcanizing agent and 2 parts by weight of N-cyclohexyl-2-benzothiazole-sulfenamide as a vulcanization accelerator were added to the rubber compound and vulcanized at 160 DEG C for 15 minutes to prepare a rubber specimen.

< Example  2>

A rubber specimen was prepared using the same composition and method as in Example 1, except that 25 parts by weight of raw material rubber A, 60 parts by weight of raw material rubber B and 15 parts by weight of natural rubber were used.

< Comparative Example  1>

50 parts by weight of a modified styrene butadiene rubber having a weight average molecular weight (Mw) of 1,250,000, a styrene content of 25% by weight and a vinyl content of 67% by weight (hereinafter also referred to as raw material rubber C), 15 parts by weight of natural rubber, A rubber specimen was prepared using the same composition and method as in Example 1, except that 100 parts by weight of a raw rubber composed of butadiene rubber having a content of 96% (hereinafter also referred to as raw rubber D) 35 parts by weight was used .

< Comparative Example  2>

Rubber specimens were prepared using the same composition and method as in Example 1, except that 45 parts by weight of the raw material C, 20 parts by weight of the natural rubber and 35 parts by weight of the raw rubber D were used.

< Comparative Example  3>

In Example 1, styrene butadiene rubber (hereinafter also referred to as raw material rubber E) having a weight average molecular weight of 850,000, a styrene content of 21% by weight and a vinyl content of 35% by weight was used in place of the raw rubber B , A rubber specimen was prepared using the same composition and method as in Example 1. [

                                                          (Unit: parts by weight) Item Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Raw material rubber A 30 25 - - 30 Raw rubber B 55 60 - - - Natural rubber 15 15 15 20 15 Raw material rubber C - - 50 45 - Raw material rubber D - - 35 35 - Raw material rubber E - - - - 55 Silica 65 65 65 65 65 Silane coupling agent 4.3 4.3 4.3 4.3 4.3 Carbon black 8 8 8 8 8 Zinc oxide 3 3 3 3 3 Antioxidant 2.75 2.75 2.75 2.75 2.75 Stearic acid 2 2 2 2 2

< Test Example >

Tensile properties such as hardness, 300% modulus, tensile strength, elongation, crack resistance and abrasion were measured according to the ASTM regulations for each of the rubber specimens prepared according to Examples 1 and 2 and Comparative Examples 1 to 3 . Also, the tangent of 0 ° C and the tangent of 70 ° C, which is an indicator of the tire dynamic index, which is the index of the glass transition temperature and the wet road surface contact force, were measured, and the results are shown in Table 2 below.

Item Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Hardness 64 63 66 66 64 300% modulus (kgf / cm2) 124 121 112 111 124 Tensile strength (kgf / cm2) 200 178 170 182 189 Elongation (%) 422 390 417 407 398 Crack resistance (mm) 5.9 6.0 4.2 5.9 6.0 Wear (g) 0.08 0.09 0.08 0.08 0.08 Glass transition temperature (캜) -30 -25 -33 -33 -23 Tangent 0 ℃ 0.41 0.38 0.24 0.24 0.30 Tangent 70 ℃ 0.08 0.07 0.11 0.11 0.09 Low temperature handling characteristics (E "-20 ℃) 78 74 20 23 20

As shown in the above Table 1, Examples 1 and 2 show higher low temperature handling characteristics than Comparative Examples 1 to 3 and exhibit equivalent hardness, 300% modulus, tensile strength, elongation, crack resistance and abrasion performance Able to know. In Examples 1 and 2, glass transition temperatures suitable for the properties of snow tires are exhibited. This is because the crystallization is carried out under low-temperature running conditions (0 ° C to minus 40 ° C) And it is possible to increase the grip between the tire and the road surface.

Claims (3)

10 to 40 parts by weight of a modified styrene butadiene rubber having a weight average molecular weight of 1,000,000 to 1,500,000, a styrene content of 35 to 50% by weight and a vinyl content of 45 to 65% by weight, a weight average molecular weight of 200,000 to 300,000, 50 to 70 parts by weight of silica with respect to 100 parts by weight of a raw rubber composed of 40 to 60 parts by weight of a modified styrene butadiene rubber having a vinyl content of 25 to 35% by weight, and 5 to 50 parts by weight of a natural rubber, And 1 to 10 parts by weight of carbon black. The rubber composition for a tire tread according to claim 1, wherein the rubber composition for a tire tread has a glass transition temperature of -40 to -25 占 폚. A tire having a tread portion comprising the rubber composition for a tire tread according to any one of claims 1 to 3.
KR1020140080622A 2014-06-30 2014-06-30 Tire tread rubber composition and tire comprising the same KR20160002457A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020140080622A KR20160002457A (en) 2014-06-30 2014-06-30 Tire tread rubber composition and tire comprising the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020140080622A KR20160002457A (en) 2014-06-30 2014-06-30 Tire tread rubber composition and tire comprising the same

Publications (1)

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KR20160002457A true KR20160002457A (en) 2016-01-08

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