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Rubber composition for coating steel cord and tire using the same

A technology of rubber composition and steel cord, which is applied to special tires, tire parts, reinforcement layers of pneumatic tires, etc., and can solve the problems of rubber strength decline, processability deterioration, and cost increase

Inactive Publication Date: 2009-04-22
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to achieve these required properties, it is conceivable to mix silica into the rubber composition for covering steel cords, but there is a problem that the rubber strength is lowered even though the rolling resistance is lowered.
It is also considered to reduce the amount of carbon black mixed in the rubber composition for covering steel cords, but in this case, the rolling resistance is reduced, but the rubber strength is reduced.
[0004] On the other hand, Japanese Patent Application Laid-Open No. 2005-75888 discloses a rubber composition for steel wire coating, which contains a rubber component, carbon black, organic acid cobalt, and a specified silane coupling agent. and sulfur, but because of the use of a specific silane coupling agent containing sulfur, there are problems of increased cost and poor processability

Method used

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  • Rubber composition for coating steel cord and tire using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3 and comparative example 1～3

[0044] According to the formula shown in Table 1, use a 1.7L Banbury internal mixer manufactured by Kobe Steel Co., Ltd. to mix the medicines except sulfur and vulcanization accelerator for more than 5 minutes under the condition of 140°C. to obtain a kneaded product. Next, sulfur and a vulcanization accelerator were added to the obtained kneaded product, and kneaded at 100° C. or lower for 3 minutes using an open mill to produce an unvulcanized rubber sheet. Furthermore, the unvulcanized rubber sheet was vulcanized flat for 10 minutes under the condition of 175°C to prepare the vulcanized rubber compositions of Examples 1-3 and Comparative Examples 1-3.

[0045] (Stretching test)

[0046] A vulcanized rubber test piece of No. 3 dumbbell was produced from the above-mentioned vulcanized rubber composition, and a tensile test was carried out in accordance with JIS K 6251 "Vulcanized rubber and thermoplastic rubber-Determination of tensile properties", and the breaking strength (T...

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Abstract

Provided is a rubber composition for steel cord coating which can improve both rubber strength and rolling resistance characteristics; and a tire made with the composition. The rubber composition for steel cord coating comprises 100 parts by mass of a diene rubber, 30-100 parts by mass of a reinforcement, and 5-40 parts by mass of an organic vulcanizing agent represented by the general formula -(R-SX)n- (wherein R is (CH2-CH2-O)m-CH2-CH2; x is an integer of 3-6; n is an integer of 10-400; and m is an integer of 2-5), and contains a cobalt salt of an organic acid. The tire has steel cords coated with the composition.

Description

technical field [0001] The present invention relates to a rubber composition for covering a steel cord and a tire using the rubber composition for covering a steel cord. Background technique [0002] Conventionally, tire cords have been provided in tires for reinforcing tires. Steel wires, organic fibers, etc. are used for this tire cord, and it is mainly provided in the carcass layer or belt layer of a tire. In particular, when steel cords are used, it is necessary to improve the adhesion between the steel cords and rubber. For this reason, the steel cords are generally covered with a rubber composition (coating rubber) for covering the steel cords. Such rubber compositions require not only durability (rubber strength), but also low fuel consumption (low rolling resistance) in consideration of environmental issues and economic efficiency. [0003] In order to achieve these required performances, it is conceivable to mix silica into the rubber composition for covering stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/00B60C1/00C08K5/098C08L81/04
CPCC08K5/098B60C2009/0021B60C1/00C08K5/372C09D181/04Y10T428/296Y02T10/86C08L21/00
Inventor 国泽铁也
Owner SUMITOMO RUBBER IND LTD