Tire Rubber Composition for Low Heat and Crack Resistance
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Solution Overview
Problem
Existing tire rubber compositions fail to achieve a balance between low heat generation and crack resistance, as increasing carbon black content or reducing particle diameter to enhance crack resistance contradicts the low heat generation property.
Innovation Solution
A tire rubber composition containing a rubber component, specific compounds with polar groups, a thiuram-based vulcanization accelerator, and a filler like carbon black or silica, which enhances chemical interaction and dispersibility, thereby improving both low heat generation and crack resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the amount of carbon black is increased to enhance crack resistance, then the fracture resistance improves, but the heat generation property deteriorates
Solution Approach 1:
The patent changes the particle size parameter of carbon black from conventional larger sizes to fine particles with specific surface area of 100-200 m²/g. This parameter change allows achieving crack resistance without the need for high carbon black content, thus avoiding excessive heat generation while maintaining fracture resistance
Solution Approach 2:
The patent creates a composite rubber composition combining natural rubber with specific fine carbon black and sulfur compounds. This composite structure optimizes the interaction between components to achieve both crack resistance and low heat generation properties simultaneously
2Strength
If the particle diameter of carbon black is decreased to enhance crack resistance, then the fracture resistance improves, but the heat generation property deteriorates
Solution Approach 1:
The patent specifically controls the particle diameter of carbon black to achieve a fine particle size corresponding to specific surface area of 100-200 m²/g. This optimized particle size parameter provides sufficient crack resistance while minimizing heat generation, resolving the contradiction between strength and energy loss
3Strength
If the amount of carbon black is increased to improve fracture resistance, then the crack propagation resistance improves, but the low heat generation property is impaired
Solution Approach 1:
The patent changes the concentration parameter by using fine carbon black particles that provide high fracture resistance at lower concentrations. The specific surface area of 100-200 m²/g allows achieving the required fracture resistance with optimized carbon black content, preventing excessive heat generation while maintaining crack propagation resistance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition achieves a balance between low heat generation and crack resistance, suitable for heavy load tires by enhancing chemical interaction and reinforcing capabilities, leading to improved tire performance.
Implementation Method 1
at least one compound (B) selected from the group consisting of a compound represented by the following formula (I) and a compound represented by the following formula (II)... enhancing chemical interaction and dispersibility
Data Source
Figure 1
AI summary
To provide a tire rubber composition that is capable of producing a tire that is excellent in balance between the low heat generation property and the crack resistance. The tire rubber composition contains a rubber component (A), at least one compound (B) selected from the group consisting of a compound represented by the formula (I) and a compound represented by the formula (II), a vulcanization accelerator (C) containing two or more kinds of vulcanization accelerators including a thiuram-based vulcanization accelerator, and a filler (D).