KR20100064660A - Rubber composition for tire tread - Google Patents

Abstract

PURPOSE: A rubber composition for a tire tread is provided to secure the environment-friendly property of the composition, to reduce the weight of a tire, and to maintain the matter property of the composition while driving in a high speed. CONSTITUTION: A rubber composition for a tire tread contains 0.1~40 parts of sodium acetate by weight for 100 parts of raw rubber by weight. The sodium acetate generates the heat while changing its phase from gel to solid by the friction with a tire and the ground. The raw rubber is selected from the group consisting of polyisoprene rubber, polybutadiene rubber, a conjugated diene aromatic vinyl copolymer, a nitrile-conjugated diene copolymer, hydrogenation NBR, hydrogenation SBR, olefin rubber, maleic acid ethylene-propylene rubber, butyl rubber, an isobutylene and aromatic vinyl diene monomer copolymer, acryl rubber, ionomer, halogenated rubber, chloroprene rubber, or their mixture.

Description

Rubber composition for tire treads {RUBBER COMPOSITION FOR TIRE TREAD}

The present invention relates to a rubber tread rubber composition, and more particularly, to an environmentally friendly rubber composition having the advantage of preventing the reduction of physical properties of the rubber composition at high speeds and improving the weight of the tire.

Conventionally, the most widely used method for tread rubber compositions to obtain improved braking performance includes the use of styrene-rich steadiene butadiene rubber, the use of smaller particle diameters of carbon black as a reinforcing filler, and oil or Tire tread raw rubber with high resin content is used.

However, tires designed and mentioned in the above use a large amount of oil or resin compared to 100 parts by weight of raw rubber, and due to high heat generation at high speeds, the physical properties of the rubber composition are drastically reduced and adversely affect the environment. have.

As described above, the market compensates for the problem that the physical properties of the rubber composition are deteriorated even at high speeds such as automobile racing, and there is an urgent need for technology development related to environmentally friendly tire performance improvement.

Accordingly, an object of the present invention is to provide a rubber composition for tire treads, which is environmentally friendly and has the advantage of preventing the reduction of physical properties of the rubber composition at high speeds and improving the weight reduction of the tire.

However, technical problems to be achieved by the present invention are not limited to the above-mentioned problems, and other technical problems will be clearly understood by the average technician from the following description.

In order to achieve the above object, the present invention comprises 0.1 to 40 parts by weight of sodium acetate with respect to 100 parts by weight of the raw material rubber, wherein the sodium acetate causes a phase change from the gel state to the solid state by friction between the tire and the ground Provided is a rubber composition for tire treads that generates heat.

The rubber composition for tire treads according to the present invention easily causes a phase change from a gel state to a solid state by a constant impact between the tire and the ground, induces rapid heat generation, thereby reducing the preheating time of the tire, thereby reducing physical properties of the tread portion rubber composition. It is possible to improve the performance by preventing it, and to reduce the weight of the reinforcing fillers and oils and resins added to the rubber composition, it is possible to reduce the weight of the racing tire and environmentally friendly effect.

The rubber composition for tire treads of the present invention applies sodium acetate to the rubber composition which induces rapid rapid heat generation due to a phase change from a gel state to a solid state, even in a weak impact, thereby preventing deterioration of physical properties of the rubber composition at high speeds. In addition, the weight reduction of the tire is improved and environmentally friendly, it is very suitable for the rubber composition for trucks, LTRs, passenger cars and tire treads for racing.

Hereinafter, the present invention will be described in more detail.

The present invention raw material rubber; And it provides a rubber composition for tire tread comprising sodium acetate.

The raw material rubbers include polyisoprene rubber, polybutadiene rubber, conjugated diene aromatic vinyl copolymer, nitrile conjugated diene copolymer, hydrogenated NBR, hydrogenated SBR, olefin rubber, ethylene-propylene rubber modified with maleic acid, butyl rubber, iso Copolymers of butylene and aromatic vinyl or diene monomers, acrylic rubbers, ionomers, halogenated rubbers, chloroprene rubbers and the like.

The sodium acetate is included in 0.1 to 40 parts by weight based on 100 parts by weight of the raw material rubber. If the content of sodium acetate is less than 0.1 parts by weight, there is a problem that heat generation does not occur, and if it exceeds 40 parts by weight to induce rubber property deterioration There is a problem.

The sodium acetate can be used in various ways depending on the water content, it may also affect the degree of heat generated by the impact depending on the water content.

Sodium acetate has been used as a product for hand stoves and generates heat when the phase changes slowly from gel to solid state. That is, sodium acetate forms crystals when it is momentarily impacted in a gel state, and generates heat at this time.

The present invention is to apply the sodium acetate to the rubber composition in order to obtain the initial high temperature heat in the tire tread portion to increase the temperature of the rubber composition of the tread portion to improve the braking performance of the tire, and to run the track for a long time to preheat the tire By reducing the time required to reduce the amount of wear of the tire, it is possible to obtain the effect of delaying the time taken to reduce the physical properties of the rubber composition generated during high-speed running.

In addition, by increasing the content of sodium acetate, the present invention can reduce the content of fillers, oils, and resins to reduce the weight and cost of the tires and also an environmentally friendly effect.

Tires made of a rubber composition for tire treads containing sodium acetate according to the present invention are applicable to tires mounted on trucks, LTRs, passenger cars and racing vehicles.

That is, when sodium acetate usable in the present invention is mixed with the tire tread portion and applied to the tire, phase change is easily performed from a gel state to a solid state by a constant impact, thereby quickly generating heat.

Specifically, sodium acetate causes a phase change due to friction between the ground and the tire tread portion, inducing a temperature increase by 0.8 ° C per second, and thus, the conventional time required for preheating the tire (85 to 90 ° C) is about 90 seconds. By shortening the time taken to reduce the physical properties of the tread rubber composition can improve the performance, and the weight reduction of reinforcing fillers, oil, and resin according to the reduction of weight of the racing tire and harmless advantages in terms of environment It is.

On the other hand, the rubber composition for a tire according to the present invention may further include a conventional rubber compounding agent. The rubber compounding agent includes process oils, reinforcing agents, additives and the like.

The additives include carbon black, silica, zinc oxide, stearic acid, sulfur, accelerators, anti-aging agents, pressure-sensitive adhesives, vulcanization accelerators, and the like, which are commonly added to rubber compositions for tires.

The content of the rubber compounding agent can be easily adjusted arbitrarily according to the desired physical properties.

Hereinafter, preferred examples and comparative examples of the present invention are described. However, the following examples are only preferred embodiments of the present invention and the present invention is not limited to the following examples.

[Examples 1-3 and Comparative Example 1]

To prepare a tire rubber composition according to Examples 1 to 3 and Comparative Example 1 using the composition shown in Table 1. The tire rubber composition was produced by a conventional tire manufacturing method.

Item Example 1 Example 2 Example 3 Comparative Example 1 Raw material rubber (1) 152 152 152 152 Sodium acetate 0.05 0.1 40 - Silica 21 21 21 21 Coupling Agent (2) 3 3 3 3 Softener (3) 14 14 14 14 Zinc oxide 3 3 3 3 Stearic acid 2 2 2 2 Antioxidant (4) 0.5 0.5 0.5 0.5 brimstone One One One One Accelerators (5) 0.3 0.3 0.3 0.3

 (Unit: parts by weight)

Corporation

(1): styrene-butadiene rubber

(2): X-50S (Evonik Degussa)

(3): A # 2 Oil (Bumwoo)

(4): Sasolwax 8820 (Sasolwax GmbH)

(5): Tetramethyl Thiuram Disulfide (TMTD) (Zhenjiang Zhenbang Chemical Industry)

The physical properties were tested for the prepared specimens, and the results are shown in Table 2 below.

Item Example 1 Example 2 Example 3 Comparative Example 1 ML1 + 4 (125 ° C) 58 61 61 59 Shore A 72 76 77 71 300% Modulus (Mpa) 130 211 215 110 Elongation (%) 424 511 512 437 0 ℃ tanδ 0.1467 0.27184 0.27209 0.13998 60 ℃ tanδ 0.09981 0.19126 0.19094 0.09118

Corporation

Pattern viscosity (ML1 + 4 (125 ° C.)) was measured according to ASTM standard D1646.

Hardness was measured according to DIN 53505

300% modulus, elongation was measured according to ISO 37 standard.

-Viscoelasticity was measured at δ-60 ℃ to 80 ℃ under 10Hz frequency at 0.1% strain using RDS meter.

As shown in Table 2, the rubber of Examples 1 to 3 produced by the tread rubber composition of the present invention was 60 times tanδ value increased by about 2 times compared to the rubber specimen of Comparative Example 1 which is a conventional tread rubber composition Able to know.

All simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims (3)

0.1 to 40 parts by weight of sodium acetate based on 100 parts by weight of the raw material rubber, The sodium acetate is a rubber tread rubber composition, characterized in that for generating heat while causing a phase change from a gel state to a solid state by friction between the tire and the ground. According to claim 1, wherein the raw material rubber is polyisoprene rubber, polybutadiene rubber, conjugated diene aromatic vinyl copolymer, nitrile conjugated diene copolymer, hydrogenated NBR, hydrogenated SBR, olefin rubber, ethylene-propylene rubber modified with maleic acid , Butyl rubber, copolymer of isobutylene and aromatic vinyl or diene monomer, acrylic rubber, ionomer, halogenated rubber, chloroprene rubber, and at least one selected from the group consisting of a combination thereof. . A tire made of a rubber composition according to any one of claims 1 or 2 is a tire tread rubber composition, characterized in that the tire is mounted on trucks, LTRs, passenger cars and racing vehicles.