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Rubber combination for heavy-load tire tread and heavy-load inflating tyre employing combination on the tire tread

A technology of rubber composition and tire tread, which is applied in the direction of tire tread/tread pattern, tire parts, special tires, etc., can solve the problems of inability to improve aging resistance and decrease in hardness, and achieve improved crack resistance, Effect of improving fracture properties

Inactive Publication Date: 2008-01-30
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, methods of reducing the amount of reinforcing agents such as vulcanization accelerators, sulfur, and carbon black are used. Although any method can increase the elongation at break, it will lead to a decrease in hardness, and there are still problems such as not being able to improve aging resistance.

Method used

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  • Rubber combination for heavy-load tire tread and heavy-load inflating tyre employing combination on the tire tread

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5 and comparative example 1～4

[0019] sample preparation

[0020] According to the compounding shown in Table I, the ingredients except the vulcanization accelerator and sulfur were mixed in a 1.8-liter closed mixer for 3 to 5 minutes, and when it reached 165±5°C, it was taken out to obtain a masterbatch. The vulcanization accelerator and sulfur shown in Table I were kneaded with this masterbatch in an open roll to obtain a rubber composition.

[0021] Then, the obtained rubber composition was vulcanized in a mold of 15×15×0.2 cm at 150° C. for 30 minutes to prepare a vulcanized rubber sheet, and the physical properties of the vulcanized rubber were measured by the following test methods. The results are shown in Table I.

[0022] Rubber physical property evaluation test method

[0023] Elongation at break (EB): Measured in accordance with JIS K6251, the value of Comparative Example 1 was 100, and the elongation at break was expressed as an index. The larger the value, the better.

[0024] Hardness:...

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PUM

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Abstract

The invention aims at providing a rubber composition used on a face of a heavy load tyre with increased fracture physical properties and improved chipping resistance during the whole moving period from an initial stage to a long term period. The invention solves the problem by providing the rubber composition, namely the rubber composition used on the face of the heavy load tyre, and is characterized in that the invention comprises substances which are: (by weight) 100 portions of rubber that can be vulcanized and natural rubber and / or compound polyisoprene rubber is taken as the main part, 30-80 portions of carbon black and / or silicon dioxide with nitrogen adsorption specific surface area of over 70m2 / g and less than 1.0 proportion of organic acid cobalt salt that is counted basing on cobalt element.

Description

technical field [0001] The present invention relates to a rubber composition for heavy-duty tire treads and a heavy-duty pneumatic tire using the rubber composition for heavy-duty tire treads in the tire tread portion, and more specifically, to a rubber composition for heavy-duty tire treads with improved fracture resistance A rubber composition for heavy-duty tire treads with excellent performance, and a heavy-duty pneumatic tire using the rubber composition in the tire tread portion. Background technique [0002] For heavy-duty tires used for running on unfavorable roads such as unrepaired roads, such as the tread surface and the tread bottom surface, in order to improve the chipping resistance, it is required to improve the fracture properties, especially It is required to improve the fracture properties throughout the period from the initial stage of running to long-term running. At present, methods of reducing the amount of reinforcing agents such as vulcanization acce...

Claims

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Application Information

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IPC IPC(8): C08L7/00C08L47/00C08K5/09B60C1/00B60C11/00C08K3/36C08K3/04
Inventor 井上芳久中山晃彦斋藤宏之
Owner YOKOHAMA RUBBER CO LTD
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