KR20160123781A - Rubber compositions for tire tread - Google Patents

Rubber compositions for tire tread Download PDF

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Publication number
KR20160123781A
KR20160123781A KR1020150054383A KR20150054383A KR20160123781A KR 20160123781 A KR20160123781 A KR 20160123781A KR 1020150054383 A KR1020150054383 A KR 1020150054383A KR 20150054383 A KR20150054383 A KR 20150054383A KR 20160123781 A KR20160123781 A KR 20160123781A
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KR
South Korea
Prior art keywords
weight
performance
parts
tire
tire tread
Prior art date
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KR1020150054383A
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Korean (ko)
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KR101777682B1 (en
Inventor
강현철
Original Assignee
금호타이어 주식회사
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Priority to KR1020150054383A priority Critical patent/KR101777682B1/en
Publication of KR20160123781A publication Critical patent/KR20160123781A/en
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Publication of KR101777682B1 publication Critical patent/KR101777682B1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • C08L25/08—Copolymers of styrene
    • C08L25/10—Copolymers of styrene with conjugated dienes
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2380/00—Tyres

Abstract

The present invention relates to a rubber composition for a tire tread and, more specifically, to a rubber composition for a tire tread comprising a liquid aliphatic resin instead of processing oil. A tire produced by the composition of the present invention has an improved brake performance and wear resistance performance on snow or ice on the road surface.

Description

Technical Field [0001] The present invention relates to a rubber composition for a tire tread,

The present invention relates to rubber compositions for tire treads and, more particularly, to replacing process oils in tire tread rubber compositions to include liquid aliphatic resins.

The tire made of the composition of the present invention relates to a rubber composition for a tire tread capable of improving braking performance and abrasion resistance on a snow or ice surface.

The rubber is deformed or recovered depending on the presence or absence of the receiving force, and is utilized in various products such as a tire, a conveyor belt, and a shoe by taking advantage of the properties of the rubber.

Among the product groups using the rubber, tires are a means for supporting and moving the vehicle, and particularly have a close influence on the driving condition of the vehicle and safety of the driver when the vehicle is in operation.

The main constituent parts of the tire include a tread portion which is externally contacted with the ground, a sidewall portion which holds the tire, and a body ply, a belt, , Beads (Bead), and Apex (Apex).

Since the tire tread portion is a portion in direct contact with the ground during the support and running of the tire, it is important every week to support and move the vehicle among the main constituent parts of the tire.

In particular, since the tire tread often needs to be stopped suddenly by a safety factor when moving the vehicle, it is required not only to have excellent braking force but also to provide excellent wet road surface braking force such as snow, ice sheet, Should be.

On the other hand, in order to improve the driving ease of the vehicle and the fuel efficiency of the vehicle, the rotation resistance between the tire tread and the ground must be low, and the wear resistance of the tire tread should be excellent in terms of economy.

In general, it is known that using a rubber having a low glass transition temperature (Tg) improves the abrasion performance and fuel consumption performance of a tire, but it is recognized that the braking performance is rather lowered. In order to compensate for the lowering of the braking performance of such tires, a solution-polymerized styrene-butadiene rubber which can adjust the microstructure of the rubber is used instead of the emulsion-polymerized styrene-butadiene rubber. However, if the content of styrene and the content of vinyl are increased, the braking performance is improved, but the wear performance and fuel consumption performance are deteriorated.

In this way, each performance of a tire shows a phenomenon that one performance is degraded when the other performance is lowered. Therefore, the technology development that can improve one performance while minimizing the other performance degradation or improve the performance at the same time Is required.

When the tire wear performance and fuel consumption performance are improved, the braking performance is deteriorated, and when the braking performance of the tire is improved, the fuel consumption may be deteriorated or the wear performance may be deteriorated. Each performance improvement of a tire has a characteristic that it is hard to satisfy at the same time because it has a compensation characteristic. Accordingly, patents relating to the development of a technology capable of minimizing other performance degradation and at the same time satisfying the two performance enhancements when one performance is improved according to the environment change are disclosed. Korean Patent Registration No. 542284 Korean Patent Registration No. 1187248 Korean Patent Registration No. 1132791

SUMMARY OF THE INVENTION An object of the present invention is to provide a rubber composition for a tire tread capable of improving braking performance and abrasion resistance at the snow and ice surface of a tire by solving the above problems.

The rubber composition for a tire tread of the present invention comprises 30 to 80 parts by weight of a solution-polymerized styrene butadiene rubber having a low styrene content, 30 to 50 parts by weight of an emulsion-polymerized styrene butadiene rubber, 20 to 50 parts by weight of a polybutadiene rubber, 5 to 50 parts by weight of carbon black, and 5 to 30 parts by weight of a solution aromatic resin.

The solution-polymerized styrene-butadiene rubber having a low styrene content used in the present invention has a styrene content of 10 to 25% by weight, a vinyl content of 50 to 70% by weight, a Tg of -20 to -60 ° C, Is preferably used. If the styrene content of the solution-polymerized styrene-butadiene rubber is less than 10% by weight, the traction performance may deteriorate. If the styrene content exceeds 25% by weight, the rolling resistance and abrasion performance may deteriorate. If it is less than 10% by weight, the traction performance is deteriorated, and if it is more than 70% by weight, the abrasion performance and the rotational resistance performance are deteriorated. When the Tg is less than -60 ° C, the traction performance is deteriorated. If the Tg is more than -20 ° C, the snow performance is lowered, and when the amount of the solution-polymerized styrene-butadiene rubber is less than 30 parts by weight It is undesirable because the rolling resistance property is lowered. If it exceeds 80 parts by weight, the tensile properties are lowered and the wear characteristics are lowered.

The emulsion-polymerized styrene-butadiene rubber used in the present invention preferably has a styrene content of 20 to 45% by weight and a Tg of -20 to -60 캜 in an amount of 30 to 50 parts by weight. If the styrene content of the emulsion-polymerized styrene-butadiene rubber is less than 20% by weight, the traction performance is undesirably deteriorated. If the styrene content is more than 45% by weight, the rotational resistance performance and the abrasion performance are deteriorated. When the amount of the emulsion-polymerized styrene-butadiene rubber is less than 30 parts by weight, the traction performance is lowered, and when the amount is more than 50 parts by weight, the abrasion performance and the rotational resistance performance are lowered. If the Tg is less than -60 ° C, the traction performance is deteriorated, and if it is more than -20 ° C, the snow performance is deteriorated.

The amount of polybutadiene to be used in the present invention is preferably 10 to 50 parts by weight. When the amount is less than 10 parts by weight, the abrasion performance is lowered, and when the amount is more than 50 parts by weight, Is undesirable.

The amount of silica to be used as a filler in the present invention is preferably 40 to 100 parts by weight. When the amount of silica to be used is less than 40 parts by weight, traction performance and rotational resistance characteristics on a wet road surface obtained by using silica as a filler are not improved, If the amount is more than 100 parts by weight, the traction performance on the dry road surface deteriorates and the tensile properties are deteriorated, which deteriorates the abrasion performance. The carbon black used as the other filler is preferably used in an amount of 5 to 50 parts by weight. When the amount of the carbon black used is less than 5 parts by weight, the blackness of the tire is undesirably lowered. When the amount is more than 50 parts by weight Is not preferable because the rotational resistance characteristic is lowered.

The liquid aromatic resin used in the present invention is preferably (D) 1,3-butadiene, homopolymer having a molecular weight of 1000 to 4000 g / mol and a glass transition temperature of -60 to -90 ° C in an amount of 5 to 30 parts by weight Do. When the molecular weight of the liquid aromatic resin is less than 1,000 g / mol, the tensile properties of the liquid aromatic resin are undesirable. When the molecular weight is more than 4000 g / mol, the viscosity of the liquid aromatic resin is undesirably low due to high viscosity. When the glass transition temperature is lower than -60 ° C, the snow performance deteriorates, and when the glass transition temperature is higher than -90 ° C, the traction performance deteriorates, and when the use amount is less than 5 parts by weight, If it exceeds 30 parts by weight, the tensile property decreases, which is not preferable.

Additives such as coupling agents, zincation, stearic acid, antioxidants, waxes, process oils, sulfur, accelerators and the like can be appropriately selected and added to the rubber composition of the present invention. And the amount used are well known in the art.

The tire according to the present invention is characterized by having a tread portion made of the tire tread rubber composition of the present invention as described above.

The rubber composition for a tire tread of the present invention is to provide a rubber composition for a tire tread having improved braking force and wear resistance on snow and ice road surfaces of the tire.

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.

≪ Examples and Comparative Examples &

The rubber composition was prepared according to the compounding specifications of the test rubber composition shown in Table 1, and its dynamic characteristics were measured by the ASTM D6382 / D6382M method and the wear characteristics by the ASTM D5963 method using the DIN abrasion tester. , And styrene content, vinyl content, and Tg of the styrene-butadiene rubber used are shown in Table 2 below.

Figure pat00001

Item Styrene vinyl Tg Solution polymerization styrene butadiene rubber 25 wt% 55 wt% -26 ℃ Emulsion polymerized styrene butadiene rubber 1
Emulsion polymerized styrene butadiene rubber 2 23.5 wt%
40.5 wt% 13 wt%
16 wt% -55 ° C
-28 ℃ Polybutadiene rubber Kumho Petrochemical KBR-01

As can be seen from the results of the comparative examples and the examples in Table 1, the rubber produced according to the present invention improves the braking performance on the snowy road surface and the ice road surface without degrading the dry road surface and rotational resistance performance, .

Claims (3)

30 to 80 parts by weight of a solution-polymerized styrene butadiene rubber having a styrene content of 10 to 25% by weight, 30 to 50 parts by weight of an emulsion-polymerized styrene butadiene rubber, 10 to 50 parts by weight of a polybutadiene, 40 to 100 parts by weight of a silica, And 10 to 30 parts by weight of a liquid aromatic resin. The rubber composition for a tire tread according to claim 1, wherein the liquid aromatic resin has a molecular weight of 1000 to 4000 g / mol and a glass transition temperature of -60 to -90 캜. A tire having a tread portion made of the tire tread rubber composition according to claim 1 or 2.
KR1020150054383A 2015-04-17 2015-04-17 Rubber compositions for tire tread KR101777682B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150054383A KR101777682B1 (en) 2015-04-17 2015-04-17 Rubber compositions for tire tread

Applications Claiming Priority (1)

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KR1020150054383A KR101777682B1 (en) 2015-04-17 2015-04-17 Rubber compositions for tire tread

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KR101777682B1 KR101777682B1 (en) 2017-09-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200058210A (en) * 2018-11-19 2020-05-27 한국타이어앤테크놀로지 주식회사 Rubber composition for tire tread and tire manufactured by using the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100542284B1 (en) 2003-09-15 2006-01-11 금호타이어 주식회사 Tread Compound for Motorcar
KR101132791B1 (en) 2009-12-21 2012-04-02 한국타이어 주식회사 Rubber composition for tire tread and tire manufactured by using the same
KR101187248B1 (en) 2010-08-09 2012-10-02 한국타이어 주식회사 Tread rubber composition and tire manufactured by using the same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5382495B2 (en) * 2008-08-29 2014-01-08 住友ゴム工業株式会社 Rubber composition and pneumatic tire using the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100542284B1 (en) 2003-09-15 2006-01-11 금호타이어 주식회사 Tread Compound for Motorcar
KR101132791B1 (en) 2009-12-21 2012-04-02 한국타이어 주식회사 Rubber composition for tire tread and tire manufactured by using the same
KR101187248B1 (en) 2010-08-09 2012-10-02 한국타이어 주식회사 Tread rubber composition and tire manufactured by using the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
타이어는 마모 성능 및 연비 성능을 향상시키면, 제동 성능이 저하되고, 타이어의 제동 성능을 향상시키면 연비가 나빠지게 되거나 마모 성능이 저하되는 경우가 발생한다. 타이어의 각 성능 향상은 보상적 성격을 가지고 있기 때문에 동시에 만족하기가 어려운 특징을 가지고 있다. 따라서 환경변화에 따라서 한가지 성능을 향상시키면, 다른 성능 저하를 최소화시키거나 동시에 두 가지 성능향상을 만족시킬 수 있는 기술 개발에 관한 특허들이 개시되고 있다.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200058210A (en) * 2018-11-19 2020-05-27 한국타이어앤테크놀로지 주식회사 Rubber composition for tire tread and tire manufactured by using the same

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