Tire Rubber Composition With Hydrazide-Carbon Black Coupling
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Solution Overview
Problem
Current rubber compositions that aim to reduce heat generation in tires for fuel-efficient vehicles often compromise on wear resistance and processability, as techniques like increasing carbon black particle diameter or decreasing its blending quantity lead to deteriorated tread rubber properties.
Innovation Solution
Incorporating a hydrazide or hydrazone compound with a specific structure and fatty acid metal salts into the rubber composition to enhance the interaction between the rubber component and carbon black, thereby improving low heat generation properties, wear resistance, and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If carbon black particle diameter is increased to reduce heat generation, then low heat generating properties are improved, but wear resistance deteriorates
Solution Approach 1:
The patent uses a hydrazide compound with specific chemical structure (formula I) that changes the chemical interaction parameters between rubber and carbon black. This compound contains aryl group A with polar groups (hydroxyl, amino, or nitro) that form strong chemical bonds with carbon black surface, enhancing the effectiveness of smaller carbon black particles for wear resistance while maintaining low heat generation through optimized tanδ control.
Solution Approach 2:
The patent creates a composite system by blending rubber components (natural rubber, synthetic rubber) with carbon black and the hydrazide coupling compound. This composite approach allows the hydrazide to act as a bridge, enabling the rubber matrix to effectively utilize carbon black for both wear resistance and heat generation control simultaneously.
2Temperature
If blending quantity of carbon black is decreased to reduce heat generation, then low heat generating properties are improved, but fracture resistance deteriorates
Solution Approach 1:
The hydrazide compound changes the chemical bonding parameters at the rubber-carbon black interface, creating strong covalent bonds that compensate for reduced carbon black quantity. The polar groups in aryl group A form efficient stress transfer pathways, maintaining fracture resistance with lower carbon black loading while achieving lower heat generation.
3Temperature
If chemical interaction between rubber and carbon black is increased to improve low heat generating properties, then tanδ is reduced, but polymer gel is formed and processability deteriorates
Solution Approach 1:
The patent optimizes the chemical interaction parameters by controlling the type and amount of hydrazide compound used. The specific structure (formula I) with adjustable polar groups allows tuning the interaction strength to achieve low tanδ without excessive gel formation. The compound reacts with carbon black surface to form a controlled interface layer that reduces hysteresis loss while maintaining processability.
Solution Approach 2:
The hydrazide compound creates localized chemical interaction zones at the carbon black surface rather than uniform reaction throughout the rubber matrix. The aryl group with polar groups binds to carbon black, creating localized bonding sites that reduce heat generation at the interface without causing widespread gelation in the bulk rubber, thus preserving processability.
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 proposed rubber composition achieves excellent low heat generation, wear resistance, and processability, making it suitable for tire applications while maintaining the desired properties without compromising on strength or ease of processing.
Implementation Method 1
the interaction between the rubber component and carbon black can be improved
Implementation Method 2
the processability can be improved
Data Source
AI summary
Provided is a rubber composition having excellent low heat generating properties, wear resistance and processability. The disclosed rubber composition contains a rubber component containing diene rubber, a filler, at least one of compounds represented by the following formulas (I) and (II), and a plurality of fatty acid metal salts each having a different type of metal.