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Rubber composition

By adding a rubber composition of cobalt neodecanoate borate, phenolic resin and curing agent to diene rubber, the problem of reduced adhesion between steel cords and rubber components is solved, and the durability and adhesion performance of the tire are significantly improved. , ensuring the stability and durability of the tire under high strain conditions.

Active Publication Date: 2018-11-23
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the adhesiveness of these steel cords to the rubber member decreases with long-term use, it may be prone to failure and the durability of the tire may decrease

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] When preparing 14 kinds of rubber compositions (Examples 1 to 6, Standard Examples, and Comparative Examples 1 to 7) composed of the compounds shown in Tables 1 and 2, the components other than sulfur and vulcanization accelerators were weighed, and used A 1.7L closed-type Banbury mixer was mixed for 5 minutes, and then the masterbatch was discharged and cooled at room temperature. This masterbatch was supplied to a 1.7L closed-type Banbury internal mixer, sulfur and a vulcanization accelerator were added, and mixed to obtain a rubber composition. In Tables 1 and 2, the compounding amount of sulfur is the compounding amount of the net weight of sulfur contained in the vulcanizing agent (product) containing sulfur.

[0046] In the rubber composition obtained above, each rubber composition other than the rubber composition of Comparative Example 7 was vulcanized at 170° C. for 10 minutes in a mold of a predetermined shape to prepare a test piece, and the test was carried ...

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PUM

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Abstract

Provided is a rubber composition which has improved bondability to steel cords in comparison to conventional rubber compositions. A rubber composition which is obtained by blending cobalt borate neodecanoate, a phenolic resin and a curing agent into a diene rubber that contains a natural rubber, and which is characterized in that: the dynamic storage elastic modulus (E') at a dynamic strain of 2%at 20 DEG C is 13 MPa or more; the tangent loss (tandelta) at 60 DEG C is 0.20 or less; and the number of repetition until breaking in a constant strain fatigue test at a strain of 60% at 400 rpm is 35,000 or more.

Description

technical field [0001] The present invention relates to a rubber composition which improves the bonding properties with steel cords. Background technique [0002] Among the pneumatic tires, there is a pneumatic tire in which a tread portion is constituted by a carcass layer and a belt layer in which steel cords are coated with a coating rubber (rubber composition for coating steel cords). If the adhesiveness of these steel cords to the rubber member decreases with long-term use, failure may easily occur and tire durability may decrease. However, in recent years, the service life of tires tends to become longer, and it has become increasingly important to increase the reinforcing effect of steel cords and to maintain durability over a long period of time. [0003] Patent Document 1 proposes improving the adhesiveness of steel cords by blending a rubber composition containing an organic acid cobalt salt into a diene rubber. However, demanders have a higher level of demand fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00B60C1/00C08K5/44C08K5/55C08L9/00C08L61/06
CPCC08L7/00C08L61/06B60C1/00C08L61/12C08K5/34922C08K5/0091C08K5/47C08K5/44C08L9/00C08K5/55B60C9/0007B60C9/20B60C2001/0066B60C2009/1828
Owner THE YOKOHAMA RUBBER CO LTD