Pneumatic Tire Tread Composition High-Temperature Grip
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Solution Overview
Problem
Tires face a decline in grip performance at high temperatures due to the decrease in hysteresis loss of rubber compositions, which affects their ability to maintain traction on hot road surfaces.
Innovation Solution
A pneumatic tire tread composition is developed using a blend of diene rubber, carbon black, silica, a specific silane coupling agent with bonding units I and II, and a crosslinking aid, optimizing the molecular structure to enhance polymer bonding strength and abrasion resistance while controlling high-temperature tan δ.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of resin having a high softening point is added to increase hysteresis loss, then grip performance on high-temperature road surfaces is improved, but abrasion resistance deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the rubber compound by incorporating a specific silane coupling agent (Formula 1) with thiol groups and a crosslinking auxiliary (Formula 3), replacing or supplementing conventional resin additives. This chemical parameter change achieves the desired hysteresis loss improvement without the adverse effects of large amounts of high-softening-point resin, thereby maintaining abrasion resistance while improving high-temperature grip performance.
Solution Approach 2:
The invention creates a composite material system combining diene rubber, silica, carbon black, and specifically the silane coupling agent with thiol groups plus crosslinking auxiliary. This composite approach allows synergistic interaction between components where the silane coupling agent strengthens silica-rubber bonding and the crosslinking auxiliary optimizes the network structure, achieving both improved grip performance and maintained abrasion resistance that cannot be achieved with single additives.
2Reliability
If the softener is changed from oil to liquid polymer to improve grip performance, then hysteresis loss increases, but the overall performance balance deteriorates
Solution Approach 1:
The invention changes the additive system from conventional softeners (oil or liquid polymer) to a specifically designed silane coupling agent system with thiol groups combined with crosslinking auxiliary. This parameter change in chemical composition achieves the desired increase in hysteresis loss for improved grip performance while maintaining better overall performance balance across multiple properties including abrasion resistance, compared to the trade-offs associated with softener substitution.
3Reliability
If resin amount is increased to improve high-temperature grip, then hysteresis loss increases, but processing complexity and cost increase
Solution Approach 1:
The invention changes the formulation parameters by using a silane coupling agent with thiol groups combined with a crosslinking auxiliary, replacing the need to increase resin content. This parameter change achieves the desired high-temperature grip performance improvement without the increased processing complexity and costs associated with handling and processing larger amounts of resin materials.
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 solution provides improved high-temperature grip performance, abrasion resistance, steering stability, and chip-cutting resistance, effectively addressing the decline in grip performance at elevated temperatures.
Implementation Method 1
by using a compound comprising the bonding unit I represented by the Formula (1) and the bonding unit II represented by the Formula (2) as the silane coupling agent, the silica-polymer bonding force can be strengthened
Implementation Method 2
hysteresis loss (tan δ), which contributes greatly to grip performance, tends to decrease the higher the temperature is
Data Source
AI summary
A pneumatic tire having excellent high-temperature grip performance and abrasion resistance is provided. The pneumatic tire is a tire having a tread composed of a predetermined rubber composition comprising a diene rubber comprising isoprene rubber, carbon black, silica, a compound comprising a predetermined bonding unit I and a bonding unit II, and a compound represented by a predetermined formula.