KR100738677B1 - Tire tread composition - Google Patents

Abstract

Provided is a tire tread composition for vehicles, which is excellent in tensile properties, snow performances, and wear resistance characteristics by adding a silane coupling agent-treated natural zeolite to improve dispersibility of a reinforcing filler. The tire tread composition comprises 2-10 parts by weight of a natural zeolite treated with a silane coupling agent based on 100 parts by weight of raw material rubbers. The natural zeolite treated with a silane coupling agent consists of 60-90wt% of a natural zeolite and 10-40wt% of a silane coupling agent, and has a specific gravity of 1.51±0.5 and a porosity of 0.25±0.15. The natural zeolite is at least any one selected from clinoptilolite, analcime, modernite, erionite, or ferrierite.

Description

Tread rubber composition for passenger car tires {Tire tread composition}

The present invention relates to a tread rubber composition for a passenger car tire, and more particularly, to improve the dispersibility of the reinforcing filler by adding a natural zeolite treated with a silane coupling agent to improve snow performance and wear resistance characteristics including tensile properties. The present invention relates to a tread rubber composition.

In the configuration of a tire, the tread is one of the important components that express the required characteristics of the tire, the tread of the tire varies depending on the pattern formed on the surface of the tread, the composition of the tread rubber.

Tread rubber of tires uses hard carbon black because it is particularly important for abrasion resistance because the wear occurs because it is in direct contact with the ground when the vehicle moves. In recent years, the performance required for tire driving is also advanced, and it is particularly important to have high wear resistance and low heat generation. Carbon black has a high specific surface area and structure, but wear resistance is high, whereas heat generation is high, so there is a trade-off between the two properties. Therefore, it is very difficult to simultaneously provide high wear resistance and low heat generation to the tread rubber composition.

In order to solve this problem, a single or heterogeneous reinforcing filler may be used to provide a rubber composition that satisfies the conditions of use and required characteristics, but it may include durability, ride comfort, noise, vibration, steering stability, There is a difficult problem in controlling different characteristics such as wear resistance.

 In order to solve this problem, a method of treating a silane coupling agent with a selected filler to improve dispersibility in raw rubber of heterogeneous fillers has been proposed. In this case, the dispersibility of how well the reinforcing fillers are dispersed in the rubber is the main issue. When the dispersion of the reinforcing fillers is lowered to a certain level, there is a problem that the overall physical properties such as tensile and wear resistance of the compounded rubber decrease. have.

It is proposed to solve the problems of the prior art as described above, an object of the present invention by adding a natural zeolite treated with a silane coupling agent to improve the dispersibility of the reinforcing filler, snow performance and wear resistance characteristics including tensile properties An excellent tread rubber composition for passenger car tires is provided.

In order to achieve the above object, the present invention is a passenger car tire, comprising: 2 to 10 parts by weight of a natural zeolite treated with a silane coupling agent in a known tread rubber composition for passenger car tires. For a tread rubber composition.

The natural zeolite treated with the silane coupling agent is characterized in that 60 to 90 wt% natural zeolite and 10 to 40wt% silane coupling agent.

Natural zeolite treated with the silane coupling agent is characterized in that the specific gravity is 1.51 ± 0.5, the porosity is 0.25 ± 0.15.

In the above, the natural zeolite may be selected from at least one selected from clinoptilolite, Analyme, Modernite, Erionite or Ferrierite.

In the above, the silane coupling agent may be selected from any one or more of mercapto silane, glycidyl silane, amino silane.

Hereinafter, the present invention will be described in detail.

The tread rubber composition for passenger car tires having improved snow performance according to the present invention includes, in the known tread rubber composition for passenger car tires, including 2 to 10 parts by weight of zeolite treated with a silane coupling agent based on 100 parts by weight of raw material rubber, including tensile properties. Snow performance and wear resistance can be improved.

In the above, the raw rubber may be used alone or mixed with natural rubber or synthetic rubber. Synthetic rubber may be any one or more selected from styrene-butadiene rubber, butadiene rubber, butyl rubber, epichlorohydrin rubber, nitrile rubber, hydrogenated nitrile rubber, urethane rubber, fluorine rubber, silicone rubber, acrylic rubber.

The natural zeolite treated with the silane coupling agent in the present invention may improve the dispersibility of carbon black and silica, which are reinforcing fillers, and improve snow performance and wear resistance, including tensile properties. In the present invention, the natural zeolite treated with such a silane coupling agent is used in less than 2 parts by weight based on 100 parts by weight of the raw material rubber, but the physical properties are maintained, but there is no improvement in snow performance and wear resistance. In addition, when the content is more than 10 parts by weight, the dispersibility is poor at the time of compounding, the physical properties are reduced, there is a fear that snow performance, wear resistance characteristics are reduced.

In the present invention, the natural zeolite treated with the silane coupling agent is preferably composed of 60 to 90 wt% of the natural zeolite and 10 to 40 wt% of the silane coupling agent.

The natural zeolite may be any one or more selected from clinoptilolite, analimme, modernite, erionite, ferrierite, and natural zeolite. It is preferable to use a specific gravity of 1.51 ± 0.5 and a porosity of 0.25 ± 0.15.

In the present invention, the silane coupling agent may use any one or more selected from mercapto silane, glycidyl silane, and amino silane.

The present invention may include various additives including an active agent, a process oil, an antioxidant, a vulcanizing agent, and a vulcanization accelerator, which are used in rubber snow tread rubber compositions for conventional passenger car tires in addition to the natural zeolite and reinforcing filler mentioned above.

The present invention includes a tire for a passenger car containing the tread rubber produced by a conventional method using the tread rubber composition mentioned above.

According to a preferred embodiment of the present invention, the added tread rubber composition of the natural zeolite treated with the silane coupling agent improves the dispersibility of the filler so that various properties such as tensile properties, snow performance (wet skid resistance), and abrasion resistance characteristics (PICO Wear) can be seen.

Hereinafter, the present invention will be described by the following comparative examples and examples. However, these are only presented to understand the content of the present invention, but the scope of the present invention is not limited to these comparative examples and examples.

Comparative Example

Tread rubber for passenger car tires was prepared using the composition shown in Table 1 below.

50 parts by weight of carbon black, 30 parts by weight of silica, 3 parts by weight of silane coupling agent, process oil with respect to 100 parts by weight of raw material rubber consisting of 50 parts by weight of natural rubber, 20 parts by weight of styrene-butadiene rubber and 30 parts by weight of butadiene rubber as raw material rubber A rubber specimen was prepared by vulcanizing 40 parts by weight, 2 parts by weight of stearic acid, 2 parts by weight of antioxidant, 3 parts by weight of zinc, 3 parts by weight of vulcanizing agent, and 2.0 parts by weight of vulcanization accelerator at 160 ° C. for 20 minutes.

Example 1

Tread rubber for passenger car tires was prepared using the composition shown in Table 1 below.

50 parts by weight of carbon black, 30 parts by weight of silica, 3 parts by weight of silane coupling agent, process oil with respect to 100 parts by weight of raw material rubber consisting of 50 parts by weight of natural rubber, 20 parts by weight of styrene-butadiene rubber and 30 parts by weight of butadiene rubber as raw material rubber 40 parts by weight, 2 parts by weight of stearic acid, 2 parts by weight of anti-aging agent, 3 parts by weight of zinc, 2 parts by weight of natural zeolite treated with silane coupling agent, 2.0 parts by weight of vulcanizing agent, 2.0 parts by weight of vulcanization accelerator for 20 minutes Rubber specimens were prepared.

The natural zeolite treated with the silane coupling agent has a specific gravity of 1.51, and is composed of 80 wt% of the natural zeolite and 20 wt% of the silane coupling agent.

The natural zeolite has a specific gravity of 1.51 and a porosity of 0.25 as clinoptilolite, and a mercapto silane was used as the silane coupling agent.

Example 2

Specimens were prepared using the same composition and method as in Example 1, except that 5 parts by weight of the natural zeolite treated with the silane coupling agent was used.

<Example 3>

Specimens were prepared using the same composition and method as in Example 1, except that 10 parts by weight of the natural zeolite treated with the silane coupling agent was used.

Table 1. Compositions of Comparative Examples and Examples

Item Comparative example Example 1 Example 2 Example 3 Natural rubber 50 50 50 50 Styrene-butadiene rubber 20 20 20 20 Butadiene rubber 30 30 30 30 Carbon black 50 50 50 50 Silica 30 30 30 30 Coupling agent 3 3 3 3 Process oil 40 40 40 40 Stearic acid 2 2 2 2 Anti-aging 2 2 2 2 Zincification 3 3 3 3 Silane Treatment Natural Zeolite - 2 5 10 Vulcanizing agent 2.0 2.0 2.0 2.0 Vulcanization accelerator 2.0 2.0 2.0 2.0

   Rubber specimens prepared in Comparative Examples and Examples were measured for hardness, 300% modulus, tensile strength, elongation rate, rebound, heat generation, PICO wear, wet skid resistance, and dispersibility according to ASTM-related regulations. 2 is shown.

       Table 2. Property measurement result

Item Comparative example Example 1 Example 2 Example 3 Hardness 61 61 62 62 300% modulus 85 85 88 90 The tensile strength 190 195 195 205 Elongation (%) 500 500 500 490 rebound(%) 30 29 28 27 Fever 28 28 29 30 PICO wear 38 36 35 32 Wet skid resistance 58 60 62 65 Dispersibility (%) 80 82 88 92

As shown in Table 2, as the amount of the natural zeolite treated with the silane coupling agent is increased in the tread rubber composition of the present invention, the dispersibility of the filler is improved, so that various properties including the tensile property and snow performance (wet skid resistance) and wear resistance characteristics It can be seen that (PICO wear) is improved.

As described above, the tread rubber composition of the present invention is improved by the addition of natural zeolite treated with a silane coupling agent, thereby improving the dispersibility of the filler, including various properties such as tensile properties, snow performance (wet skid resistance), and wear resistance (PICO). Wear) can be improved.

Claims (5)

A tread rubber composition for a passenger car tire, comprising 2 to 10 parts by weight of a natural zeolite treated with a silane coupling agent based on 100 parts by weight of a raw material rubber. The tread rubber composition according to claim 1, wherein the natural zeolite treated with the silane coupling agent is 60 to 90 wt% of the natural zeolite and 10 to 40 wt% of the silane coupling agent. The tread rubber composition according to claim 1, wherein the natural zeolite treated with the silane coupling agent has a specific gravity of 1.51 ± 0.5 and a porosity of 0.25 ± 0.15. The method of claim 2, wherein the natural zeolite is any one or more selected from Clinoptilolite (Clinoptilolite), Analyme, Modernite (Ernionite), Erionite or Ferrierite (Ferrierite) Tread rubber composition. The tread rubber composition according to claim 2, wherein the silane coupling agent is at least one selected from mercapto silane, glycidyl silane, and amino silane.