KR100219941B1 - A rubber composition for tire tread - Google Patents

A rubber composition for tire tread Download PDF

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KR100219941B1
KR100219941B1 KR1019970020828A KR19970020828A KR100219941B1 KR 100219941 B1 KR100219941 B1 KR 100219941B1 KR 1019970020828 A KR1019970020828 A KR 1019970020828A KR 19970020828 A KR19970020828 A KR 19970020828A KR 100219941 B1 KR100219941 B1 KR 100219941B1
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weight
parts
rubber
rubber composition
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KR1019970020828A
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KR19980084904A (en
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김형윤
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홍건희
한국타이어주식회사
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/06Copolymers with styrene
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES TYRE INFLATION; TYRE CHANGING OR REPAIRING; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C1/00Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
    • B60C1/0016Compositions of the tread
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/02Elements
    • C08K3/04Carbon
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00Use of organic ingredients
    • C08K5/01Hydrocarbons
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/002Physical properties
    • C08K2201/006Additives being defined by their surface area
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/02Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025Polymer 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

Abstract

본 발명은 타이어 트레드용 고무 조성물에 관한 것으로, 스티렌 결합량이 22 내지 25몰%인 유화중합 스티렌-부타디엔 공중합 고무 10 내지 30 중량부, 스티렌 결합량이 35 내지 45몰%인 유화중합 스티렌-부타디엔 공중합 고무 40 내지 70 중량부, 시스 함량이 92 내지 98몰%인 부타디엔 고무 10 내지 40 중량부로 이루어지는 전체 고무 성분 100 중량부에 대하여, 질소흡착 비표면적이 110 내지 160㎡/g이고, DBP 흡유량이 100 내지 140㎖/100g인 카본 블랙 50 내지 80 중량부, 방향족 오일 30 내지 45 중량부 및 통상의 타이어 트레드용 고무 조성물에 사용되는 첨가제를 함유하는 타이어 트레드용 고무 조성물인 것이다.The present invention relates to a rubber tread rubber composition, 10 to 30 parts by weight of an emulsion-polymerized styrene-butadiene copolymer rubber having a styrene bond amount of 22 to 25 mol%, and an emulsion-polymerized styrene-butadiene copolymer rubber having an styrene bond amount of 35 to 45 mol%. Nitrogen adsorption specific surface area is 110-160 m <2> / g, DBP oil absorption amount is 100-200 weight part with respect to 100 weight part of total rubber components which consists of 40-70 weight part and 10-40 weight part of butadiene rubber with a sheath content of 92-98 mol%. It is a rubber composition for tire treads which contains 50-80 weight part of carbon blacks which are 140 ml / 100g, 30-45 weight part of aromatic oils, and the additive used for the conventional rubber tread rubber composition.
본 발명에 따르면, 고무의 보강성과 동적손실계수를 동시에 높여 타이어의 내마모 성능 및 젖은 노면에서의 제동 성능이 개선되어 균형을 이룬 타이어 트레드용 고무 조성물을 제조할 수 있다.According to the present invention, the rubber composition for tire treads can be manufactured by improving the reinforcement of the rubber and the dynamic loss coefficient at the same time to improve the wear resistance of the tire and the braking performance on the wet road surface.

Description

타이어 트레드용 고무 조성물Rubber composition for tire tread
본 발명은 타이어 트레드용 고무 조성물에 관한 것으로, 더욱 상세하게는 유화중합 스티렌-부타디엔 공중합 고무, 시스-부타디엔의 함량이 높은 부타디엔 고무, 카본 블랙 및 방향족 오일을 사용함으로써 내마모성과 제동 성능이 개선되어 균형을 이룬 타이어 트레드용 고무 조성물에 관한 것이다.The present invention relates to a rubber tread rubber composition, and more particularly, by using emulsion-polymerized styrene-butadiene copolymer rubber, butadiene rubber having a high content of cis-butadiene, carbon black and aromatic oils to improve abrasion resistance and brake performance. It relates to a rubber tread rubber composition.
일반적으로, 타이어에 필요한 성능으로는 제동 성능, 연비 성능, 내마모 성능 등을 들 수 있는데, 이들은 약간씩 상반되는 성질을 가지고 있다. 특히, 제동 성능과 내마모 성능의 경우에, 대체로 내마모 성능이 좋은 고무는 제동 성능이 떨어지고, 반대로 제동 성능이 좋은 고무는 내마모 성능이 떨어져 두 성능간의 균형을 유지하기가 상당히 어렵다.In general, the performance required for tires include braking performance, fuel economy performance, abrasion resistance, and the like, which have slightly opposite properties. In particular, in the case of braking performance and abrasion resistance, a rubber having good abrasion resistance generally has a low braking performance, whereas a rubber having a good braking performance has a poor abrasion resistance, making it difficult to balance the two performances.
보통, 타이어의 내마모 성능을 향상시키기 위하여는 천연고무에 부타디엔 고무를 첨가하거나, 가공유 첨가량을 줄이거나 혹은 카본 블랙의 첨가량을 증가시키는 방법이 있으나, 이러한 방법은 타이어의 내마모 성능을 어느 정도 향상시킬 수는 있으나 제동 성능에는 불리한 영향을 줄 수 있다.In general, in order to improve abrasion resistance of a tire, there are methods of adding butadiene rubber to natural rubber, reducing the amount of processing oil, or increasing the amount of carbon black, but this method improves abrasion resistance of the tire to some extent. Although this can be done, it can adversely affect braking performance.
따라서, 상기한 제동 성능과 내마모 성능을 모두 만족하는 타이어 트레드용 고무 조성물이 요구되었는데, 이러한 상반되는 2가지 성능을 동시에 만족시키기 위한 연구가 진행되고 있다.Accordingly, there has been a demand for a rubber tread rubber composition that satisfies both the braking performance and the abrasion resistance described above, and studies to satisfy these two opposing performances at the same time are underway.
본 발명자는 제동 성능, 특히 젖은 노면에서의 제동 성능과 내마모 성능이 모두 개선되어 균형을 이룬 타이어 트레드용 고무 조성물을 제조하기 위해 예의 연구한 결과, 스티렌 결합량이 22 내지 25몰%인 유화중합 스티렌-부타디엔 공중합 고무, 스티렌 결합량이 35 내지 45몰%인 유화중합 스티렌-부타디엔 공중합 고무, 시스-부타디엔의 함량이 높은 부타디엔 고무, 카본 블랙 및 방향족 오일을 사용함으로써 내마모성과 제동 성능이 동시에 향상된 타이어 트레드용 고무 조성물을 제조할 수 있다는 것을 알게 되어 본 발명에 이르게 되었다.The inventors of the present invention have conducted intensive studies to produce a rubber tread rubber composition in which the braking performance, in particular, the braking performance and the abrasion resistance on the wet road are improved, and thus, the amount of styrene bond is 22 to 25 mol%, and the emulsion polymerization styrene Butadiene copolymer rubber, emulsified polymerized styrene-butadiene rubber with 35 to 45 mol% styrene bond, butadiene rubber with high cis-butadiene content, carbon black and aromatic oils for tire treads with improved wear and braking performance It has been found that the rubber composition can be prepared, thus leading to the present invention.
이에 본 발명의 목적은 고무의 보강성과 동적손실계수를 동시에 높여 타이어의 내마모 성능 및 젖은 노면에서의 제동 성능이 개선되어 균형을 이룬 타이어 트레드용 고무 조성물을 제공하는 것이다.Accordingly, it is an object of the present invention to provide a rubber composition for a tire tread by improving the reinforcement of the rubber and the dynamic loss coefficient at the same time to improve the wear resistance of the tire and the braking performance on the wet road surface.
본 발명은 스티렌 결합량이 22 내지 25몰%인 유화중합 스티렌-부타디엔 공중합 고무 10 내지 30 중량부, 스티렌 결합량이 35 내지 45몰%인 유화중합 스티렌-부타디엔 공중합 고무 40 내지 70 중량부, 시스 함량이 92 내지 98몰%인 부타디엔 고무 10 내지 40 중량부로 이루어지는 전체 고무 성분 100 중량부에 대하여, 질소흡착 비표면적이 110 내지 160㎡/g이고, DBP 흡유량이 100 내지 140㎖/100g인 카본 블랙 50 내지 80 중량부, 방향족 오일 30 내지 45 중량부 및 통상의 타이어 트레드용 고무 조성물에 사용되는 첨가제를 함유하는 것을 특징으로 하는 타이어 트레드용 고무 조성물인 것이다.The present invention is 10 to 30 parts by weight of the emulsion-polymerized styrene-butadiene copolymer rubber having a styrene bond amount of 22 to 25 mol%, 40 to 70 parts by weight of the emulsion-polymerized styrene-butadiene copolymer rubber having a styrene bond amount of 35 to 45 mol%, Nitrogen adsorption specific surface area is 110-160 m <2> / g, and DBP oil absorption amount is 100-140 ml / 100g with respect to 100 weight part of whole rubber components which consists of 10-40 weight part of butadiene rubber which is 92-98 mol%, It is a rubber composition for tire treads containing 80 weight part, aromatic oil 30-45 weight part, and the additive used for the conventional rubber tread rubber composition.
이하, 본 발명을 더욱 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in more detail.
본 발명에 있어서, 고무 성분은 스티렌 결합량이 22 내지 25몰%인 유화중합 스티렌-부타디엔 공중합 고무(이하, SBR(1)이라 함) 10 내지 30 중량부, 스티렌 결합량이 35 내지 45몰%인 유화중합 스티렌-부타디엔 공중합 고무(이하, SBR(2)라 함) 40 내지 70 중량부 및 시스 함량이 92 내지 98몰%인 부타디엔 고무 10 내지 40 중량부로 이루어져서 전체 100 중량부가 된다.In the present invention, the rubber component is emulsified with 10 to 30 parts by weight of an emulsion-polymerized styrene-butadiene copolymer rubber (hereinafter referred to as SBR (1)) having a styrene bond amount of 22 to 25 mol%, and an styrene bond amount of 35 to 45 mol%. 40 to 70 parts by weight of the polymerized styrene-butadiene copolymer rubber (hereinafter referred to as SBR (2)) and 10 to 40 parts by weight of butadiene rubber having a cis content of 92 to 98 mol% to 100 parts by weight in total.
SBR(1)과 SBR(2)를 상기 범위내에서 사용할 경우, 고무의 일반적 물성인 점탄성 특성 중에서 0℃에서의 동적손실계수(0℃ tanδ)가 커져서 젖은 노면에서의 제동거리가 감소하여 제동 성능이 향상된다. 만족할 만한 제동 성능을 얻기 위해서는 최소한 이 범위로 사용하여야 하며, 상기 범위 이상으로 사용할 경우, 제동 성능은 더욱 향상되나 내마모 성능은 크게 저하될 수 있다.When SBR (1) and SBR (2) are used within the above ranges, the dynamic loss coefficient (0 ° C tanδ) at 0 ° C becomes larger among the viscoelastic properties, which are the general physical properties of rubber, and the braking performance is reduced by reducing the braking distance on the wet road surface. This is improved. In order to obtain satisfactory braking performance, it should be used at least in this range. If it is used in the above range, the braking performance is further improved, but the wear resistance may be greatly reduced.
SBR(1) 및 SBR(2)는 유화중합으로 제조된 스티렌과 부타디엔의 공중합 고무로서 상기와 같은 스티렌 결합량을 가지며, 본 발명에서는 제조시 고무내에 가공유로서 방향족 오일을 일정량 첨가시켜 상품화한 것을 사용할 수 있다.SBR (1) and SBR (2) are copolymerized rubbers of styrene and butadiene prepared by emulsion polymerization, and have a styrene bond as described above, and in the present invention, those prepared by adding a certain amount of aromatic oil as processed oil in the rubber during manufacture are used. Can be.
본 발명에서는 내마모 성능을 향상시키기 위해서, 시스-부타디엔 함량이 92 내지 98몰%인 부타디엔 고무(이하, BR이라 함) 10 내지 40 중량부를 사용하였다. 상기 BR을 40중량부 이상으로 사용하면 젖은 노면에서의 제동 성능이 현저히 감소하게 된다. 또한 BR이 10중량부 이하로 첨가되면 내마모 성능의 효과가 적어진다.In the present invention, 10 to 40 parts by weight of butadiene rubber (hereinafter referred to as BR) having a cis-butadiene content of 92 to 98 mol% was used to improve the wear resistance. When the BR is used in an amount of 40 parts by weight or more, braking performance on a wet road surface is significantly reduced. In addition, when BR is added in an amount of 10 parts by weight or less, the effect of wear resistance becomes less.
카본 블랙으로는 질소흡착 비표면적이 110 내지 160㎡/g이고, DBP 흡유량이 100 내지 140㎖/100g인 것을 사용한다. 또한, 사용량은 50 내지 80 중량부인 것이 바람직하다. 상기 카본 블랙은 종래의 카본 블랙보다 표면적이 큰 것으로, 상기 범위내에서 사용할 경우, 고무의 보강성과 동적손실계수를 동시에 높일 수 있게 된다.As carbon black, the nitrogen adsorption specific surface area is 110-160 m <2> / g, and DBP oil absorption amount is 100-140 ml / 100g. Moreover, it is preferable that the usage-amount is 50-80 weight part. The carbon black has a larger surface area than the conventional carbon black, and when used within the above range, it is possible to simultaneously increase the reinforcement and dynamic loss coefficient of the rubber.
본 발명에서는 가공유로서 방향족 오일을 30 내지 45 중량부 첨가하였다. 방향족 오일의 첨가량을 증가시키면 젖은 노면에서의 제동 성능을 향상시킬 수 있으나, 45 중량부 이상의 가공유를 첨가하면 내마모 성능이 저하되고 30 중량부 이하로 첨가하면 제동 성능이 불리해진다.In this invention, 30-45 weight part of aromatic oils were added as process oil. Increasing the amount of aromatic oil can improve the braking performance on wet roads, but adding 45 wt. Parts or more of processing oil lowers the wear resistance, and adding 30 wt. Or less of the braking performance is disadvantageous.
상기와 같은 본 발명의 방법에 의한 타이어 트레드용 고무 조성물은 종래의 타이어 트레드용 고무 조성물과 비교하여 타이어의 내마모 성능 및 젖은 노면에서의 제동 성능을 모두 개선시키게 된다.The rubber composition for tire treads according to the method of the present invention as described above improves both the wear resistance of the tire and the braking performance on the wet road surface as compared with the conventional rubber tread composition.
실시예Example
이하, 본 발명을 실시예에 의거하여 더욱 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in more detail with reference to Examples.
이하의 실시예와 비교예에서 실시된 타이어 성능 평가시험은 다음과 같은 방법으로 실시하였다.Tire performance evaluation test carried out in the following Examples and Comparative Examples was carried out by the following method.
동적손실계수(0℃ tanδ) 측정방법How to measure the dynamic loss factor (0 ℃ tanδ)
Temperature sweep으로 torsion type의 점탄성 시험기를 사용하여 0.5% 스트레인으로 10Hz의 주파수로 측정하였다.Using a torsion type viscoelastic tester as a temperature sweep was measured at a frequency of 10Hz with 0.5% strain.
동적손실계수(0℃ tanδ)는 젖은노면에서의 제동거리에 미치는 영향에 대한 실험적 데이터를 근거로 이 값이 클수록 젖은 노면에서의 제동거리가 감소하여 제동 성능이 향상된다.The dynamic loss factor (0 ° C tanδ) is based on experimental data on the effect of braking distance on wet roads. The larger this value, the lower the braking distance on wet roads.
실차 웨트 제동거리Actual vehicle wet braking distance
젖은 노면에서 60km/h 속도에서 제동시 측정되는 제동거리로서, 수치가 작을수록 제동 성능이 우수하다.The braking distance measured during braking at wet speed of 60km / h. The smaller the value, the better the braking performance.
실차 마모지수Actual vehicle wear index
타이어를 실제 차량에 취부하여 15000km 주행후 타이어의 마모 결과를 지수로 환산한 값으로, 100을 기준으로 지수가 클수록 내마모 성능이 우수하다(제조 타이어 사이즈 : P195/70 R 14T)The tires are mounted on an actual vehicle, and the tire wear results are converted into an index after 15,000 km. The larger the index is, the better the wear resistance is. (Manufacturing tire size: P195 / 70 R 14T)
실시예 1Example 1
SBR(1) 27.5중량부, SBR(2) 68.75중량부, 부타디엔 고무 30중량부, 질소흡착 비표면적이 155㎡/g이며, DBP 흡유량이 130㎖/100g인 카본 블랙(이하, C/B(2)라 함) 80중량부, 방향족 오일 8중량부, 활성제 4중량부, 스테아린산 2중량부, 노화 방지제 5중량부, 유황 2.3중량부, 가류 촉진제 1.5중량부를 혼합하여 고무 조성물을 제조하였다.27.5 parts by weight of SBR (1), 68.75 parts by weight of SBR (2), butadiene rubber 30 parts by weight, nitrogen adsorption specific surface area of 155 m 2 / g, and carbon black having a DBP oil absorption of 130 ml / 100 g (hereinafter referred to as C / B ( 2)) 80 parts by weight, 8 parts by weight of aromatic oil, 4 parts by weight of active agent, 2 parts by weight of stearic acid, 5 parts by weight of antioxidant, 2.3 parts by weight of sulfur, 1.5 parts by weight of vulcanization accelerator were mixed to prepare a rubber composition.
제조된 고무 조성물을 시험 시편으로 제조하여 동적손실계수(0℃ tanδ), 실차 웨트 제동거리를 측정하고 타이어를 실제 차량에 취부하여 실차 마모지수를 측정하였다. 측정결과를 다음 표 1에 기재하였다.The rubber composition was prepared as a test specimen to measure the dynamic loss factor (0 ° C. tanδ), the actual vehicle wet braking distance, and the tire to be mounted on an actual vehicle to measure the actual vehicle wear index. The measurement results are shown in Table 1 below.
실시예 2Example 2
SBR(1) 27.5중량부, SBR(2) 55중량부, 부타디엔 고무 40중량부, 질소흡착 비표면적이 155㎡/g이며, DBP 흡유량이 130㎖/100g인 카본 블랙 80중량부, 방향족 오일 8중량부, 활성제 4중량부, 스테아린산 2중량부, 노화 방지제 5중량부, 유황 2.3중량부, 가류 촉진제 1.5중량부를 혼합하여 고무 조성물을 제조하였다.SBR (1) 27.5 parts by weight, SBR (2) 55 parts by weight, butadiene rubber 40 parts by weight, nitrogen adsorption specific surface area of 155 m2 / g, 80 parts by weight of carbon black having a DBP oil absorption of 130 ml / 100 g, aromatic oil 8 A rubber composition was prepared by mixing parts by weight, 4 parts by weight of active agent, 2 parts by weight of stearic acid, 5 parts by weight of anti-aging agent, 2.3 parts by weight of sulfur, and 1.5 parts by weight of vulcanization accelerator.
제조된 고무 조성물을 시험 시편으로 제조하여 동적손실계수(0℃ tanδ), 실차 웨트 제동거리를 측정하고 타이어를 실제 차량에 취부하여 실차 마모지수를 측정하였다. 측정결과를 다음 표 1에 기재하였다.The rubber composition was prepared as a test specimen to measure the dynamic loss factor (0 ° C. tanδ), the actual vehicle wet braking distance, and the tire to be mounted on an actual vehicle to measure the actual vehicle wear index. The measurement results are shown in Table 1 below.
비교예 1Comparative Example 1
SBR(1) 96.25중량부, 부타디엔 고무 30중량부, 질소흡착 비표면적이 94㎡/g이며, DBP 흡유량이 120㎖/100g인 카본 블랙(이하, C/B(1)이라 함) 80중량부, 방향족 오일 10중량부, 활성제 4중량부, 스테아린산 2중량부, 노화 방지제 5중량부, 유황 2.3중량부, 가류 촉진제 1.5중량부를 혼합하여 고무 조성물을 제조하였다.SBR (1) 96.25 parts by weight, butadiene rubber 30 parts by weight, nitrogen adsorption specific surface area of 94 m 2 / g, 80 parts by weight of carbon black (hereinafter referred to as C / B (1)) of DBP oil absorption of 120ml / 100g A rubber composition was prepared by mixing 10 parts by weight of aromatic oil, 4 parts by weight of active agent, 2 parts by weight of stearic acid, 5 parts by weight of anti-aging agent, 2.3 parts by weight of sulfur, and 1.5 parts by weight of vulcanization accelerator.
제조된 고무 조성물을 시험 시편으로 제조하여 동적손실계수(0℃ tanδ), 실차 웨트 제동거리를 측정하고 타이어를 실제 차량에 취부하여 실차 마모지수를 측정하였다. 측정결과를 다음 표 1에 기재하였다.The rubber composition was prepared as a test specimen to measure the dynamic loss factor (0 ° C. tanδ), the actual vehicle wet braking distance, and the tire to be mounted on an actual vehicle to measure the actual vehicle wear index. The measurement results are shown in Table 1 below.
비교예 2Comparative Example 2
SBR(1) 137.5중량부, 질소흡착 비표면적이 94㎡/g이며, DBP 흡유량이 120㎖/100g인 카본 블랙 90중량부, 방향족 오일 10중량부, 활성제 4중량부, 스테아린산 2중량부, 노화 방지제 5중량부, 유황 2.3중량부, 가류 촉진제 1.5중량부를 혼합하여 고무 조성물을 제조하였다.SBR (1) 137.5 parts by weight, nitrogen adsorption specific surface area of 94 m 2 / g, 90 parts by weight of carbon black with DBP oil absorption 120ml / 100g, 10 parts by weight of aromatic oil, 4 parts by weight of active agent, 2 parts by weight of stearic acid, aging A rubber composition was prepared by mixing 5 parts by weight of the inhibitor, 2.3 parts by weight of sulfur, and 1.5 parts by weight of vulcanization accelerator.
제조된 고무 조성물을 시험 시편으로 제조하여 동적손실계수(0℃ tanδ), 실차 웨트 제동거리를 측정하고 타이어를 실제 차량에 취부하여 실차 마모지수를 측정하였다. 측정결과를 다음 표 1에 기재하였다.The rubber composition was prepared as a test specimen to measure the dynamic loss factor (0 ° C. tanδ), the actual vehicle wet braking distance, and the tire to be mounted on an actual vehicle to measure the actual vehicle wear index. The measurement results are shown in Table 1 below.
비교예 3Comparative Example 3
SBR(1) 27.5중량부, SBR(2) 41.25중량부, 부타디엔 고무 50중량부, 질소흡착 비표면적이 155㎡/g이며, DBP 흡유량이 130㎖/100g인 카본 블랙 80중량부, 방향족 오일 8중량부, 활성제 4중량부, 스테아린산 2중량부, 노화 방지제 5중량부, 유황 2.3중량부, 가류 촉진제 1.5중량부를 혼합하여 고무 조성물을 제조하였다.SBR (1) 27.5 parts by weight, SBR (2) 41.25 parts by weight, butadiene rubber 50 parts by weight, nitrogen adsorption specific surface area of 155 m2 / g, 80 parts by weight of carbon black having a DBP oil absorption of 130 ml / 100 g, aromatic oil 8 A rubber composition was prepared by mixing parts by weight, 4 parts by weight of active agent, 2 parts by weight of stearic acid, 5 parts by weight of anti-aging agent, 2.3 parts by weight of sulfur, and 1.5 parts by weight of vulcanization accelerator.
제조된 고무 조성물을 시험 시편으로 제조하여 동적손실계수(0℃ tanδ), 실차 웨트 제동거리를 측정하고 타이어를 실제 차량에 취부하여 실차 마모지수를 측정하였다. 측정결과를 다음 표 1에 기재하였다.The rubber composition was prepared as a test specimen to measure the dynamic loss factor (0 ° C. tanδ), the actual vehicle wet braking distance, and the tire to be mounted on an actual vehicle to measure the actual vehicle wear index. The measurement results are shown in Table 1 below.
비교예 4Comparative Example 4
SBR(1) 27.5중량부, SBR(2) 82.5중량부, 부타디엔 고무 20중량부, 질소흡착 비표면적이 155㎡/g이며, DBP 흡유량이 130㎖/100g인 카본 블랙 80중량부, 방향족 오일 8중량부, 활성제 4중량부, 스테아린산 2중량부, 노화 방지제 5중량부, 유황 2.3중량부, 가류 촉진제 1.5중량부를 혼합하여 고무 조성물을 제조하였다.SBR (1) 27.5 parts by weight, SBR (2) 82.5 parts by weight, butadiene rubber 20 parts by weight, nitrogen adsorption specific surface area of 155 m2 / g, 80 parts by weight of carbon black having a DBP oil absorption of 130 ml / 100 g, aromatic oil 8 A rubber composition was prepared by mixing parts by weight, 4 parts by weight of active agent, 2 parts by weight of stearic acid, 5 parts by weight of anti-aging agent, 2.3 parts by weight of sulfur, and 1.5 parts by weight of vulcanization accelerator.
제조된 고무 조성물을 시험 시편으로 제조하여 동적손실계수(0℃ tanδ), 실차 웨트 제동거리를 측정하고 타이어를 실제 차량에 취부하여 실차 마모지수를 측정하였다. 측정결과를 다음 표 1에 기재하였다.The rubber composition was prepared as a test specimen to measure the dynamic loss factor (0 ° C. tanδ), the actual vehicle wet braking distance, and the tire to be mounted on an actual vehicle to measure the actual vehicle wear index. The measurement results are shown in Table 1 below.
비교예 5Comparative Example 5
SBR(1) 27.5중량부, SBR(2) 96.25중량부, 부타디엔 고무 10중량부, 질소흡착 비표면적이 155㎡/g이며, DBP 흡유량이 130㎖/100g인 카본 블랙 80중량부, 방향족 오일 8중량부, 활성제 4중량부, 스테아린산 2중량부, 노화 방지제 5중량부, 유황 2.3중량부, 가류 촉진제 1.5중량부를 혼합하여 고무 조성물을 제조하였다.SBR (1) 27.5 parts by weight, SBR (2) 96.25 parts by weight, butadiene rubber 10 parts by weight, nitrogen adsorption specific surface area of 155 m2 / g, 80 parts by weight of carbon black having a DBP oil absorption of 130 ml / 100 g, aromatic oil 8 A rubber composition was prepared by mixing parts by weight, 4 parts by weight of active agent, 2 parts by weight of stearic acid, 5 parts by weight of anti-aging agent, 2.3 parts by weight of sulfur, and 1.5 parts by weight of vulcanization accelerator.
제조된 고무 조성물을 시험 시편으로 제조하여 동적손실계수(0℃ tanδ), 실차 웨트 제동거리를 측정하고 타이어를 실제 차량에 취부하여 실차 마모지수를 측정하였다. 측정결과를 다음 표 1에 기재하였다.The rubber composition was prepared as a test specimen to measure the dynamic loss factor (0 ° C. tanδ), the actual vehicle wet braking distance, and the tire to be mounted on an actual vehicle to measure the actual vehicle wear index. The measurement results are shown in Table 1 below.
[표 1]TABLE 1
(단위 : 중량부)(Unit: parts by weight)
Figure kpo00001
Figure kpo00001
1SBR(1)과 SBR(2)의 가공방법은 다음과 같다. 1 Processing method of SBR (1) and SBR (2) is as follows.
[표 2]TABLE 2
Figure kpo00002
Figure kpo00002
* 순고무 100중량부에 대한 가공유 중량부, 방향족 오일을 사용함.* Processed oil parts by weight and aromatic oil are used based on 100 parts by weight of pure rubber.
2 시스-부타디엔이 92 내지 98몰% 함유됨.Contains 92-98 mole% of 2 cis-butadiene.
3 방향족 오일로 A#2 오일을 사용함.3 Use A # 2 oil as aromatic oil.
비교예 3에서 보는 바와 같이, BR의 첨가량이 너무 높으면(40 중량부 이상) 젖은 노면에서의 제동 성능이 현저히 감소되고, 비교예 5에서 보는 바와 같이 BR 첨가량이 적어지면 내마모 성능의 효과를 보기가 어려워진다. 또한, 비교예 2에서 보는 바와 같이 너무 많은 양의 가공유를 첨가하면(45 중량부 이상) 내마모 성능이 저하되고, 비교예 3에서 보는 바와 같이 가공유가 너무 적으면 제동 성능이 저하된다.As shown in Comparative Example 3, when the amount of BR added is too high (40 parts by weight or more), the braking performance on the wet road surface is significantly reduced, and as shown in Comparative Example 5, the amount of BR added decreases the effect of wear resistance. Becomes difficult. In addition, as shown in Comparative Example 2, when too much amount of the processed oil is added (45 parts by weight or more), the wear resistance is lowered. As shown in Comparative Example 3, when the process oil is too small, the braking performance is lowered.
본 발명에 따라 내마모 성능을 향상시키기 위해 시스 함량이 높은 부타디엔 고무 및 표면적이 큰 카본 블랙을 사용하고, 젖은 노면에서의 제동성 향상을 위해 스티렌 결합량이 높은 스티렌-부타디엔 공중합 고무를 적절히 혼용하여 고무의 보강성과 동적손실계수를 동시에 높여 타이어의 내마모 성능 및 젖은 노면에서의 제동 성능이 개선되어 균형을 이룬 타이어 트레드용 고무 조성물을 제조할 수 있다.According to the present invention, butadiene rubber having a high cis content and carbon black having a large surface area are used to improve abrasion resistance, and a styrene-butadiene copolymer rubber having a high styrene bonding amount is mixed in order to improve braking property on wet road surfaces. The rubber composition for tire treads can be manufactured by improving the wear resistance of the tire and the braking performance on the wet road surface by simultaneously improving the reinforcement and dynamic loss coefficient of the tire.

Claims (1)

  1. 스티렌 결합량이 22 내지 25몰%인 유화중합 스티렌-부타디엔 공중합 고무 10 내지 30 중량부, 스티렌 결합량이 35 내지 45몰%인 유화중합 스티렌-부타디엔 공중합 고무 40 내지 70 중량부, 시스 함량이 92 내지 98몰%인 부타디엔 고무 10 내지 40 중량부로 이루어지는 전체 고무 성분 100 중량부에 대하여, 질소흡착 비표면적이 110 내지 160㎡/g이고, DBP 흡유량이 100 내지 140㎖/100g인 카본 블랙 50 내지 80 중량부, 방향족 오일 30 내지 45 중량부 및 통상의 타이어 트레드용 고무 조성물에 사용되는 첨가제를 함유하는 것을 특징으로 하는 타이어 트레드용 고무 조성물.10 to 30 parts by weight of emulsion-polymerized styrene-butadiene copolymer rubber having 22 to 25 mol% styrene bond, 40 to 70 parts by weight of emulsion-polymerized styrene-butadiene copolymer rubber having 35 to 45 mol% styrene bond, and 92 to 98 50 to 80 parts by weight of carbon black having a nitrogen adsorption specific surface area of 110 to 160 m 2 / g and a DBP oil absorption of 100 to 140 ml / 100 g based on 100 parts by weight of the total rubber component consisting of 10 to 40 parts by weight of butadiene rubber in mol%. And 30 to 45 parts by weight of aromatic oil and an additive used in a conventional rubber tread rubber composition.
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