Rubber composition for tire tread

专利摘要:
The present invention provides a rubber composition for tire treads that can improve braking performance and fuel economy performance by appropriately blending polymer blends and appropriately using reinforcing fillers such as carbon black, silica and silane. It is to provide. The present invention is a rubber component consisting of 20 to 30 parts by weight of natural rubber, 40 to 55 parts by weight of styrene butadiene rubber of emulsion type, 10 to 20 parts by weight of solution styrene butadiene rubber and 10 to 15 parts by weight of polybutadiene rubber, and carbon A rubber composition for tire treads comprising 40 to 50 parts by weight of black, 10 to 20 parts by weight of silica, 1.3 to 1.5 parts by weight of accelerator, and silane as 8% by weight of silica.
公开号:KR20020000185A
申请号:KR1020000034480
申请日:2000-06-22
公开日:2002-01-05
发明作者:정철오
申请人:조충환；한국타이어 주식회사；
IPC主号:

专利说明:

Rubber composition for tire treads {RUBBER COMPOSITION FOR TIRE TREAD}
[1] The present invention relates to a rubber composition for tire treads.
[2] As the classification of light trucks is newly established in the types of vehicles classified as passengers and trucks, the use of vehicles used only for cargo is gradually becoming a weight-lifting means of transportation. Changed.
[3] As light trucks are diversified into general vans, sports vans, and general purpose vans, they have been used for the same purposes as general passenger vehicles.
[4] As a result, the performance demanded by the vehicle company for light truck tires and the performance demanded by ordinary users are gradually increased.
[5] In other words, the wear and durability performance was the top priority, from the level of passenger tires required to ride comfort, braking performance, fuel economy reduction.
[6] Unlike trucks, light trucks are divided into places where road conditions are good (for on-road), places that use a road along with roads (for on & off roads), and places that use roads mainly for roads (for off-roads). In order to use it, it is necessary to use a different formulation according to the conditions of use.In addition to using a separate formulation, a compound that can cover various road conditions is used. There has been a significant increase in the need for improved braking power.
[7] Likewise, in the era of high oil prices, fuel economy has become an important requirement for automobile companies to consider in developing new vehicles.
[8] This necessitates the development of new formulations that can improve braking power, especially wet traction and reduce fuel consumption, without compromising basic wear performance.
[9] Conventional polymers used for light truck cap tread formulations have high tensile strength in consideration of wear performance in chipping, chipping and chunking. SBR (styrene butadiene rubber) considering wear performance and braking force in relatively favorable conditions and BR (butadiene rubber) with particularly good wear performance are used in combination at an appropriate ratio to satisfy the performance required as a cap tread rubber for light trucks. I tried to get it.
[10] However, the use of the above general rubber did not satisfy three performances desired by the consumer, such as braking force, abrasion performance, and fuel economy, even when other carbon reinforcing fillers such as rubber reinforcing fillers were changed.
[11] Korean Unexamined Patent Publication No. 1996-37318 relates to a tire having a tread having a cap / base structure, and based on 100 parts by weight of rubber, about 20 to 50 phr of cis 1,4-polyisoprene natural rubber, styrene / butadiene prepared by emulsion polymerization. Copolymer and Solution Polymerization Tread consisting of at least one selected styrene / butadiene copolymer of styrene / butadiene copolymer elastomer comprising about 25 to about 80 phr and cis 1,4-polybutadiene elastomer liquid 0 to about 50 phr Described for the cap. However, due to the large amount of polymer used, it also failed to satisfy braking force, wear performance, and fuel economy.
[12] Therefore, the present invention is formulated with SBR produced by the solution manufacturing method, rather than manufactured in general emulsion type, which has a large impact on the braking force, in particular by applying a silica, a reinforcing filler having a great influence on braking force, fuel efficiency performance, It is a technical problem to manufacture a rubber tread rubber composition capable of satisfying wear performance and fuel economy.
[13] The present invention provides a rubber composition for tire treads that can improve braking performance and fuel economy performance by appropriately blending polymer blends and appropriately using reinforcing fillers such as carbon black, silica and silane. The purpose is to provide.
[14] The present invention is a rubber component consisting of 20 to 30 parts by weight of natural rubber, 40 to 55 parts by weight of styrene butadiene rubber of emulsion type, 10 to 20 parts by weight of solution styrene butadiene rubber and 10 to 15 parts by weight of polybutadiene rubber, and carbon And 40 to 50 parts by weight of black, 10 to 20 parts by weight of silica, 1.3 to 1.5 parts by weight of accelerator, and silane of 8% by weight of silica.
[15] In the present invention, it is preferable to use 20 to 30 parts by weight of natural rubber, but if it is used below 20 parts by weight, the tensile strength of the rubber is lowered, which is not suitable for the use of tires of light trucks, and also has a disadvantage in fuel efficiency. Will be shown. On the contrary, when it is used in an amount exceeding 30 parts by weight, the fuel economy performance is advantageous, but the tire braking performance is disadvantageous.
[16] The styrene butadiene rubber of the emulsion type has a styrene content of 40%, a vinyl content of 18% and a polymer Tg of -60 to -50 ° C, preferably 40 to 55 parts by weight. If the styrene content is high and the addition amount exceeds the above range, the hardness of the rubber increases, resulting in a decrease in vulcanization productivity, and on the contrary, the braking performance decreases when added below the above range.
[17] The styrene butadiene rubber of the solution type has a styrene content of 20 to 25%, a vinyl content of 60% and a polymer Tg of -40 to -35 ° C, preferably 10 to 20 parts by weight. If it is used in less than the above range, the fuel economy performance is lowered, on the contrary, when used in the above range, mixing processability and the tensile strength of the rubber is lowered.
[18] The polybutadiene rubber has a sheath content of 90% or more, preferably 10 to 15 parts by weight. If the vehicle is less than the above range, the weight of the vehicle is heavier than that of the passenger, and it is difficult to maintain the wear performance due to the high use severity. On the contrary, if the vehicle is used beyond the above range, the braking performance and the fuel efficiency are adversely affected.
[19] On the other hand, carbon black, which affects rubber reinforcement, is filled in rubber and affects not only the toughness of the rubber but also the fuel efficiency. As described above, the iodine adsorption amount is 100 to 120 mg / g and the DBP is 130 to 140 cm 3/100 g. It is preferable to use 40-50 weight part of phosphorus carbon black. If it is used in excess of 50 parts by weight, the tensile strength of the rubber is excessively increased, which not only adversely affects the wear performance but also adversely affects the fuel efficiency performance.
[20] In addition, as an accelerator, N-cyclohexyl-2-benzothiazyl-sulfenamide is selected in order to maintain an appropriate cure time because of high styrene gkaid of the polymers used in the present invention, and the amount thereof is preferably 1.3 to 1.5 parts by weight. . If it is out of the above range, excessive hardness increases, which adversely affects braking performance.
[21] Silica is used in order to improve the fuel efficiency of a tire, and it is preferable that nitrogen adsorption surface area is 160-180 m <2> / g, DBP is 230-240 cm <3> / g, and the use amount is 10-20 weight part. If used out of the above range will cause a sharp decrease in wear performance.
[22] In the case of silane, it may vary depending on the amount of silica used, and most preferably, 8% by weight of silica is used.
[23] Hereinafter, the present invention will be described in more detail with reference to the following examples.
[24] Examples 1 and 2
[25] To prepare a rubber composition by combining the components shown in Table 1. The measurement results of the physical properties of the prepared rubber compositions are shown in Tables 2 and 3, respectively.
[26] Compounding agentExample 1Example 2Comparative Example 1Comparative Example 2 Natural rubber20203535 Synthetic Rubber 1 65Synthetic Rubber 26555 55 Synthetic Rubber 3515 10 Synthetic Rubber 41010 Carbon black50406540 Silica1020 10 Silane0.91.8 0.9 Zincification3333 Stearic acid1.51.51.51.5 Accelerator 1 1.1Accelerator 21.11.5 1.6 brimstone1.51.51.41.5
[27] Synthetic rubber 1: emulsion styrene butadiene (styrene content 23%)
[28] Synthetic rubber 2: emulsion styrene butadiene (styrene content 40%)
[29] Synthetic Rubber 3: Solution Styrene Butadiene
[30] Synthetic Rubber 4: Polybutadiene
[31] Carbon black: Carbon black with iodine adsorption amount of 100 to 120 mg / g and DBP of 130 to 140 cm 3/100 g
[32] Silica: Silica with nitrogen adsorption surface area of 160 to 180 m 2 / g and DBP of 230 to 240 cm 3 / g
[33] Accelerator 1: N-tert-butyl-2-benzothiazyl-sulfenamide
[34] Accelerator 2: N-cyclohexyl-2-benzothiazyl-sulfenamide
[35] Sulfur: Insoluble sulfur (20% oil treatment)
[36] PropertiesExample 1Example 2Comparative Example 1Comparative Example 2 Hardness66626358 Modulus (300%)13510610292 Viscoelastic 0 ° C tanδ 60 ° C tanδ0.22160.15110.29640.13940.15390.16040.21640.1421 Lamborgan Wear (Index)8610010078
[37] Table 3 shows the result of comparing the property evaluation results of Table 2 with Comparative Example 1.
[38] PropertiesExample 1Example 2Comparative Example 2 Hardness5% ↑2% ↓8% ↓ Modulus (300%)32% ↑4% ↑10% ↓ Viscoelastic 0 ° C tanδ 60 ° C tanδ44% ↑ 6% ↑92% ↑ 15% ↑41% ↑ 13% ↑ Lamborgan Wear (Index)14% ↓equal22% ↓
[39] According to the composition of the present invention, in the case of the tread compound, the polymer blend is properly blended, and when the reinforcing filler carbon black, silica, and silane are properly used, the braking performance and the fuel efficiency are improved in a range that does not reduce the wear performance. have.

权利要求:
Claims (3)
[1" claim-type="Currently amended] Natural rubber 20-30 parts by weight, emulsion type styrene butadiene rubber 40 to 55 parts by weight, solution styrene butadiene rubber 10 to 20 parts by weight and polybutadiene rubber 10 to 15 parts by weight, carbon black 40 to A tire tread rubber comprising 50 parts by weight, 10 to 20 parts by weight of silica, 1.3 to 1.5 parts by weight of N-cyclohexyl-2-benzothiazyl-sulfenamide as an accelerator, and 8% by weight of silane as silica. Composition.
[2" claim-type="Currently amended] The styrene butadiene rubber of the emulsion type has a styrene content of 40%, a vinyl content of 18%, a polymer Tg of -60 to -50 ° C, and the styrene butadiene rubber of the solution type has a styrene content of 20-25%, the vinyl content is 60%, the polymer Tg is -40 to -35 ℃, the polybutadiene rubber is used for the tire tread characterized in that the sheath content is 90% or more.
[3" claim-type="Currently amended] The method of claim 1, wherein the carbon black has an iodine adsorption amount of 100 to 120 mg / g, DBP 130 to 140 cm 3 / 100g, the silica has a nitrogen adsorption surface area of 160 to 180 m 2 / g, DBP 230 to 240 cm 3 The rubber composition for tire treads characterized by using what is / g.

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同族专利:

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公开号 | 公开日

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KR100384643B1|2003-05-22|

引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2000-06-22|Application filed by 조충환, 한국타이어 주식회사

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2000-06-22|Priority to KR10-2000-0034480A

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2002-01-05|Publication of KR20020000185A

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2003-05-22|Application granted

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2003-05-22|Publication of KR100384643B1

优先权:

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申请号 | 申请日 | 专利标题

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KR10-2000-0034480A|KR100384643B1|2000-06-22|2000-06-22|Rubber composition for tire tread|