KR100871279B1 - Rubber compositions for tire tread - Google Patents

Rubber compositions for tire tread Download PDF

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Publication number
KR100871279B1
KR100871279B1 KR1020070094891A KR20070094891A KR100871279B1 KR 100871279 B1 KR100871279 B1 KR 100871279B1 KR 1020070094891 A KR1020070094891 A KR 1020070094891A KR 20070094891 A KR20070094891 A KR 20070094891A KR 100871279 B1 KR100871279 B1 KR 100871279B1
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South Korea
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weight
parts
butadiene rubber
styrene
rubber
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KR1020070094891A
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Korean (ko)
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이광석
강성일
장민영
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금호타이어 주식회사
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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
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/06—Copolymers with styrene
    • 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
    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

Abstract

A rubber composition for a tire tread is provided to improve traction capacity, rotation resistance and wear performance by comprising a solution polymerization styrene butadiene rubber having a styrene content of a medium level and a vinyl content of a high level and a butadiene rubber having a cis structure of a high level. A rubber composition for a tire tread comprises 30-60 weight% of solution polymerization styrene butadiene rubber which has a styrene content of 20~40 weight%, vinyl content of 50~80 weight%, and Tg of -25 ~ -50 deg.C; 10~50 parts by weight of butadiene rubber having a cis structure more than 94%; 30~60 parts by weight of isobutylene bromide-co-oara-methyl styrene; 10~30 parts by weight of carbon black; and 30~100 parts by weight of silica.

Description

타이어 트레드용 고무조성물{Rubber compositions for tire tread} Rubber compositions for tire treads

본 발명은 타이어 트레드용 고무조성물에 관한 것으로서, 좀더 상세하게는 중간 수준의 스티렌 함량과, 고수준의 비닐 함량을 갖는 용액중합 스티렌부타디엔고무, 고수준의 시스구조를 갖는 부타디엔고무, 브롬화 이소부틸렌-코-오아라-메틸스티렌 및 실리카를 포함하여 이루어지므로써 트랙션, 마모 및 회전저항 성능이 향상된 타이어 트레드용 고무조성물에 관한 것이다.The present invention relates to a rubber composition for a tire tread, and more particularly, a solution-polymerized styrene butadiene rubber having a medium styrene content and a high vinyl content, butadiene rubber having a high level cis structure, isobutylene bromide It relates to a rubber composition for tire treads, comprising oara-methylstyrene and silica, thereby improving traction, wear and rolling resistance.

최근 차량에 대한 평가중 차량의 제동거리가 주요 성능 평가 항목으로 대두되고 있다. 또한 소비자 역시 차량의 사고에 대한 정보를 자주 접하게 됨에 따라 안전에 대한 인식이 높아서 차량의 제동성능에 대해 많은 관심을 보이고 있다. 이전에는 스노우 타이어의 제동성능만 크게 인식되어 왔고, 일반 타이어에서는 제동성능에 대한 인식이 스노우 타이어만 못했으나, 상기의 이유로 모든 차종의 신차 개발시 제동거리에 대해 정부기관에서 평가가 이루어지기 때문에, 실제 타이어에서 노면과 접촉하는 트레드 컴파운드 개발시 제동거리를 고려한 컴파운드 설계가 필수적이다. Recently, the braking distance of the vehicle has emerged as a major performance evaluation item. In addition, as consumers frequently encounter information about vehicle accidents, they are showing much interest in the braking performance of vehicles due to high awareness of safety. Previously, only the braking performance of snow tires has been greatly recognized, and the braking performance of ordinary tires has not been recognized only by snow tires, but for the above reasons, the braking distance is evaluated by the government agencies when developing new models of all vehicles. When developing a tread compound that is in contact with a road surface in a real tire, a compound design considering the braking distance is essential.

타이어의 트레드는 노면과 직접 접촉하면서 접지 고속 회전운동을 하기 때문 에, 벨트에 고착해 있는 트레드 고무 내측면은 일정한 속도로 회전을 계속하지만, 표면은 노면과의 접촉으로 인해 회전이 늦어서, 트레드 고무가 인열변형과 함께 차체의 하중의 작용에 따라 압축 변형한다. 이러한 변형은 트레드 고무의 표면과 이면과의 사이에 위상차이를 나타내고, 표면 부분은 슬립되어 구동하고, 더욱 회전하여 접지로부터 해방되어 원래의 형상으로 복원된다. 이들의 변형은 중첩이 되풀이되고, 히스테리시스 손실의 원인으로 된다. Since the tread of the tire is in contact with the road surface and makes a high-speed rotational movement, the inner surface of the tread rubber stuck to the belt continues to rotate at a constant speed, but the surface is slow to rotate due to the contact with the road surface. Along with tear deformation, compressive deformation is performed according to the action of the load on the vehicle body. This deformation exhibits a phase difference between the surface and the backside of the tread rubber, the surface portion slips to drive, and further rotates to be released from ground and restored to its original shape. These deformations are repeated and cause hysteresis loss.

일반적으로 타이어 제동성능을 향상시키기 위해서는 스티렌 함량이 높은 미세구조를 갖는 스티렌-부타디엔고무를 사용하지만, 이와 같은 타이어 트레드 고무조성물은 반발탄성이 낮고, 발열이 높아서 회전저항이 하락하여 바람직하지 않다.In general, styrene-butadiene rubber having a fine structure having a high styrene content is used to improve tire braking performance. However, such a tire tread rubber composition has low rebound elasticity and high heat generation, which is not preferable because of low rolling resistance.

본 발명의 목적은 상기와 같은 문제점을 해결하여, 트랙션 성능을 탁월히 개선시키면서, 회전저항성능과 마모성능을 동등 이상으로 갖는 타이어 트레드용 고무조성물을 제공하는 것이다.An object of the present invention is to solve the above problems, to provide a rubber composition for tire tread having a rotation resistance performance and abrasion performance equally or more while improving the traction performance.

본 발명의 타이어 트레드용 고무조성물은 스티렌 함량이 20~40중량%이고, 비닐 함량이 50~80중량%이고, Tg가 -25℃~-50℃인 용액중합 스티렌부타디엔고무 30~60중량부, 94% 이상의 시스구조를 갖는 부타디엔고무 10~50중량부, 브롬화 이소부틸렌-코-오아라-메틸스티렌(brominated isobutylene-co-oara-methylstyrene:BIMS) 30~60중량부, 카본블랙 10~30중량부 및 실리카 30~100중량부를 포함하여 이루어지는 것을 특징으로 한다.The rubber composition for tire treads of the present invention has a styrene content of 20 to 40% by weight, a vinyl content of 50 to 80% by weight, and a solution polymerization styrene butadiene rubber of 30 to 60 parts by weight of Tg of -25 ° C to -50 ° C, 10-50 parts by weight of butadiene rubber having a cis structure of 94% or more, 30-60 parts by weight of brominated isobutylene-co-oara-methylstyrene (BIMS), carbon black 10-30 It comprises a weight part and 30-100 weight part of silica.

본 발명에서 사용되는 용액중합 스티렌부타디엔고무는 스티렌 함량이 20~40중량%, 비닐함량이 50~80중량%이고, Tg가 -25℃~-50℃인 것이 바람직하고, 그 사용량은 30~60중량부인 것이 바람직하다. 상기 용액중합 스티렌부타디엔고무의 스티렌 함량이 20중량% 미만인 경우에는 트랙션 성능이 하락하여 바람직하지 않고, 40중량%를 초과하는 경우에는 회전저항성능과 마모성능이 하락하여 바람직하지 않으며, 상기 비닐 함량이 50중량% 미만인 경우에는 트랙션 성능이 하락하여 바람직하지 않고, 80중량%를 초과하는 경우에는 마모성능이 하락하여 바람직하지 않다. 또한, Tg가 -25℃ 미만인 경우에는 스노우 성능이 하락하여 바람직하지 않고, -50℃를 초과 하는 경우에는 트랙션 성능이 하락하여 바람직하지 않으며, 사용량이 30중량부 미만인 경우에는 트랙션 성능이 개선되지 않아 바람직하지 않고, 60중량부를 초과하는 경우에는 회전저항성능이 급격하게 하락하여 바람직하지 않다.The solution-polymerized styrene-butadiene rubber used in the present invention has a styrene content of 20 to 40% by weight, a vinyl content of 50 to 80% by weight, preferably a Tg of -25 ° C to -50 ° C, and the amount of use thereof is 30 to 60 It is preferable that it is a weight part. When the styrene content of the solution-polymerized styrene-butadiene rubber is less than 20% by weight, the traction performance is not preferable, and when it exceeds 40% by weight, the rotational resistance performance and the wear performance are not preferable, and the vinyl content is If it is less than 50% by weight, the traction performance decreases, which is not preferable. If it exceeds 80% by weight, the wear performance is lowered, which is not preferable. In addition, when the Tg is less than -25 ℃ snow performance is not preferable to drop, and if it exceeds -50 ℃, the traction performance is not preferable, and if the amount is less than 30 parts by weight, the traction performance is not improved. It is not preferable, and when it exceeds 60 parts by weight, the rolling resistance performance is drastically decreased, which is not preferable.

본 발명에서 사용되는 94% 이상의 시스구조를 갖는 부타디엔고무의 사용량은 10~30중량부인 것이 바람직한데, 사용량이 10중량부 미만인 경우에는 마모특성이 하락하여 바람직하지 않고, 30중량부를 초과하는 경우에는 마모특성은 좋지만 핸들링 특성이 하락하여 바람직하지 않다.The amount of butadiene rubber having a cis structure of 94% or more used in the present invention is preferably 10 to 30 parts by weight, but when the amount is less than 10 parts by weight, the wear property is not preferable, and when it exceeds 30 parts by weight. Wear characteristics are good but handling characteristics are deteriorated, which is undesirable.

본 발명에서 사용되는 브롬화 이소부틸렌-코-오아라-메틸스티렌의 사용량은 30~60중량부인 것이 바람직한데, 사용량이 30중량부 미만인 경우에는 트랙션 성능이 개선되지 않아 바람직하지 않고, 60중량부를 초과하는 경우에는 인장물성이 하락하여 마모특성이 하락하여 바람직하지 않다. The amount of isobutylene-co-oara-methyl styrene used in the present invention is preferably 30 to 60 parts by weight, but when the amount is less than 30 parts by weight, the traction performance is not improved. If exceeded, the tensile property is lowered and the wear characteristics are lowered, which is not preferable.

본 발명에서 사용되는 카본블랙의 사용량은 10~30중량부인 것이 바람직한데, 사용량이 10중량부 미만인 경우에는 타이어의 흑도가 떨어져서 바람직하지 않고, 30중량부를 초과하는 경우에는 실리카의 사용량을 줄여야 하기 때문에 트랙션 성능과 회전저항 특성의 향상을 얻을 수가 없어서 바람직하지 않다.The use amount of carbon black used in the present invention is preferably 10 to 30 parts by weight, but if the amount is less than 10 parts by weight, the blackness of the tire is not preferable, and if the amount is more than 30 parts by weight, the amount of silica to be used is reduced. It is not preferable because an improvement in traction performance and rolling resistance characteristics cannot be obtained.

본 발명에서 사용되는 실리카의 사용량은 30~100중량부인 것이 바람직한데, 사용량이 30중량부 미만인 경우에는 충전제로서 실리카를 사용함으로써 얻어지는 트랙션 성능과 회전저항 특성의 향상이 얻어지지 않고, 100중량부를 초과하는 경우에는 인장물성이 하락하여 바람직하지 않다.The amount of silica used in the present invention is preferably 30 to 100 parts by weight, but when the amount is less than 30 parts by weight, the improvement in traction performance and rolling resistance characteristics obtained by using silica as a filler is not obtained, but exceeds 100 parts by weight. In this case, the tensile property is lowered, which is not preferable.

본 발명의 고무조성물에는 통상적인 고무조성물용 첨가제들, 예로서 커플링 제, 아로마틱오일, 노화방지제, 산화아연, 스테아린산, 황, 촉진제, 활성제 등의 첨가제들을 적절히 선택하여 첨가할 수 있으며, 이러한 첨가제들의 선택 및 사용량은 당 분야에서는 공지이다.To the rubber composition of the present invention, additives for conventional rubber compositions, such as coupling agents, aromatic oils, anti-aging agents, zinc oxide, stearic acid, sulfur, accelerators, activators and the like can be appropriately selected and added. The selection and usage of these are known in the art.

본 발명의 타이어 트레드용 고무조성물은 마모성능과 회전저항성능의 하락 없이, 트랙션 성능을 탁월하게 개선시킬 수 있다.The rubber composition for tire tread of the present invention can improve the traction performance without a drop in wear performance and rotational resistance performance.

이하, 본 발명을 하기 실시예 및 비교예에 의하여 보다 구체적으로 설명한다. 하기의 실시예는 본 발명을 실시하기 위한 예에 지나지 않으며, 본 발명의 보호범위를 제한하고자 하는 것은 아니다.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 protection scope of the present invention.

실시예Example 및  And 비교예Comparative example

표 1에 나타낸 시험고무 조성물의 배합사양에 따라 고무조성물을 제조하고, 그 동적특성 및 마모특성을 측정하여 표 1에 나타내었다.A rubber composition was prepared according to the blending specifications of the test rubber composition shown in Table 1, and the dynamic and wear characteristics thereof were measured and shown in Table 1 below.

(단위:중량부)                                             (Unit: weight part) 구분division 비교예Comparative example 실시예Example 용액중합-스티렌부타디엔고무1 ) 용액중합-스티렌부타디엔고무2 ) BIMS3 ) 부타디엔 고무4 ) Solution Polymerization-Styrene-Butadiene Rubber 1 ) Solution Polymerization-Styrene-Butadiene Rubber 2 ) BIMS 3 ) Butadiene Rubber 4 ) 40 0 0 2040 0 0 20 0 40 40 200 40 40 20 카본블랙 실리카 커플링제Carbon Black Silica Coupling Agent 32.4 30 2.432.4 30 2.4 10 70 4.210 70 4.2 인장물성Tensile Properties 경도 300%-모듈러스 (kg/㎠) 인장강도(kg/㎠) 신율(%)Hardness 300%-Modulus (kg / ㎠) Tensile Strength (kg / ㎠) Elongation (%) 62 118 210 48962 118 210 489 70 143 234 47370 143 234 473 동적 점탄성Dynamic viscoelasticity Tg 0℃ Tanδ 70℃ Tanδ 복합 모듈러스Tg 0 ℃ Tanδ 70 ℃ Tanδ Composite Modulus -15 0.480 0.129 42-15 0.480 0.129 42 -5℃ 0.736 0.128 155-5 ° C 0.736 0.128 155 마모성능Wear performance DIN 마모DIN wear 0.1320.132 0.1310.131

주)week)

1) 스티렌부타디엔고무 : 스티렌 함량 35.5중량%, 비닐 함량 33중량%, Tg = -34℃1) Styrenebutadiene rubber: Styrene content 35.5 wt%, Vinyl content 33 wt%, Tg = -34 ℃

2) 스티렌부타디엔고무 : 스티렌 함량 34중량%, 비닐 함량 58중량%, Tg = -28℃2) Styrenebutadiene rubber: styrene content 34% by weight, vinyl content 58% by weight, Tg = -28 ℃

3) BIMS : 브롬화 이소부틸렌-코-오아라-메틸스티렌(BIMS;Brominated isobutylene-co-oara-methylstyrene)3) BIMS: Brominated isobutylene-co-oara-methylstyrene (BIMS)

4) 부타디엔 고무 : 시스 함량이 94% 이상, Tg = -103℃4) Butadiene rubber: Sheath content is over 94%, Tg = -103 ℃

상기 표 2의 결과로부터 알 수 있는 바와 같이, 본 발명에 따라 제조된 고무는 마모성능과 회전저항성능의 하락 없이, 트랙션 성능을 탁월하게 개선시킬 수 있다.As can be seen from the results of Table 2, the rubber produced according to the present invention can excellently improve the traction performance, without a decrease in wear performance and rotational resistance performance.

Claims (1)

스티렌 함량이 20~40중량%이고, 비닐 함량이 50~80중량%이고, Tg가 -25℃~-50℃인 용액중합 스티렌부타디엔고무 30~60중량부, 94% 이상의 시스구조를 갖는 부타디엔고무 10~50중량부, 브롬화 이소부틸렌-코-오아라-메틸스티렌 30~60중량부, 카본블랙 10~30중량부 및 실리카 30~100중량부를 포함하여 이루어지는 것을 특징으로 하는 타이어 트레드용 고무조성물.30 to 60 parts by weight of a solution-polymerized styrene-butadiene rubber having a styrene content of 20 to 40% by weight, a vinyl content of 50 to 80% by weight, and a Tg of -25 ° C to -50 ° C, butadiene rubber having a cis structure of 94% or more 10 to 50 parts by weight, brominated isobutylene-co- oara-methylstyrene, 30 to 60 parts by weight, carbon black 10 to 30 parts by weight and silica composition comprising a rubber composition for tire treads .
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100195663B1 (en) * 1990-06-08 1999-06-15 에인혼 해롤드 Composition for tire treads
KR19990079640A (en) 1998-04-08 1999-11-05 홍건희 Rubber composition for tire tread
KR20010032104A (en) 1997-12-15 2001-04-16 엑손 케미칼 패턴츠 인코포레이티드 Transparent and colorable elastomeric compositions
KR20030087645A (en) 2001-03-19 2003-11-14 엑손모빌 케미칼 패턴츠 인코포레이티드 High traction and wear resistant elastomeric compositions

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100195663B1 (en) * 1990-06-08 1999-06-15 에인혼 해롤드 Composition for tire treads
KR20010032104A (en) 1997-12-15 2001-04-16 엑손 케미칼 패턴츠 인코포레이티드 Transparent and colorable elastomeric compositions
KR19990079640A (en) 1998-04-08 1999-11-05 홍건희 Rubber composition for tire tread
KR20030087645A (en) 2001-03-19 2003-11-14 엑손모빌 케미칼 패턴츠 인코포레이티드 High traction and wear resistant elastomeric compositions

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