Tread Rubber Composition Balancing Rolling Resistance and Grip
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tire tread rubber compositions struggle to balance fuel economy, handling stability, and abrasion resistance, with conventional methods either compromising on stiffness or providing insufficient reinforcement.
Innovation Solution
A tread rubber composition comprising styrene-butadiene rubber, polybutadiene rubber, silica, and carbon black, with specific ratios of M200, E*, and tan δ that satisfy the relationship M200 × E*/tan δ ≥ 400, enhancing fuel economy, handling stability, and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional rubber compositions are used to improve fuel economy, then rolling resistance decreases, but handling stability and abrasion resistance deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight distribution (Mw/Mn ratio between 1.5-3.0) and composition ratios of SBR and polybutadiene rubber, along with optimizing filler content (75-150 parts silica per 100 parts rubber). These parameter adjustments achieve the optimal balance where M200 × E*/tanδ ≥ 400, simultaneously improving fuel economy while maintaining handling stability and abrasion resistance
Solution Approach 2:
The patent uses composite materials by combining SBR with polybutadiene rubber in specific ratios (60-95 wt% SBR, 5-40 wt% polybutadiene), and incorporating multiple fillers (silica and carbon black) with coupling agents. This composite structure creates synergistic effects that improve overall performance, achieving low rolling resistance while maintaining high handling stability and abrasion resistance
2Reliability
If rubber composition is modified to improve handling stability, then stiffness increases, but fuel economy and abrasion resistance worsen
Solution Approach 1:
The patent controls the M200 and E* parameters within specific ranges (M200: 5-15 MPa, E*: 0.5-2.0 MPa) while maintaining the relationship M200 × E*/tanδ ≥ 400. This parameter optimization ensures adequate stiffness for handling stability while preventing excessive energy loss, achieving both fuel economy and handling performance
3Reliability
If filler content is increased to improve abrasion resistance, then durability increases, but rolling resistance and fuel economy worsen
Solution Approach 1:
The patent optimizes filler content within specific ranges (silica: 75-150 parts, carbon black: 0-50 parts per 100 parts rubber) and controls the Mw/Mn ratio (1.5-3.0) to balance reinforcement and energy loss. The coupling agent content is also optimized (3-20 parts per 100 parts silica) to ensure good dispersion and reduce hysteresis, achieving high abrasion resistance while maintaining fuel economy
Solution Approach 2:
The patent creates a composite material system combining silica, carbon black, and coupling agents with specific rubber components. This composite structure provides synergistic reinforcement that improves abrasion resistance without the excessive filler loading that would cause high rolling resistance and poor fuel economy
Data Source
AI summary
Provided are tread rubber compositions and pneumatic tires which are excellent in fuel economy, handling stability, and abrasion resistance. Included are tread rubber compositions having a M200 at 25°C, a E* at 30°C, and a tan δ at 30°C which satisfy the following relationship: M200 × E*/tan δ ≥ 400.