Tyre Tread Rubber Composition for Low Rolling Resistance in Winter
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Solution Overview
Problem
Existing tire tread compounds face a trade-off between improving rolling resistance and maintaining wet grip and snow performance, with compromises often necessary in formulations.
Innovation Solution
A cross-linkable rubber composition comprising 91-99 phr of natural or isoprene rubber and syndiotactic 1,2 polybutadiene, with a carbon black filler ratio of 1:8 to 1:3, which balances rolling resistance, snow performance, and wet grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the amount of carbon black is reduced to improve rolling resistance, then rolling resistance improves, but wet grip performance deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the rubber compound by introducing specific polybutadiene rubber with high 1,2-cis content (≥80 mol%) and controlling the carbon black type and amount. This parameter change allows achieving low rolling resistance while maintaining wet grip through the unique molecular structure and hysteresis loss characteristics of the polybutadiene rubber.
Solution Approach 2:
The invention creates a composite rubber compound by combining natural rubber or isoprene rubber with polybutadiene rubber having high 1,2-cis content, along with specific carbon black fillers. This composite material approach allows the synergistic effects of different rubber polymers to achieve both low rolling resistance and good wet grip performance simultaneously.
2Loss of energy
If the tread compound is optimized for rolling resistance, then rolling resistance improves, but snow performance deteriorates
Solution Approach 1:
The invention optimizes the glass transition temperature and molecular structure parameters of the rubber compound by using polybutadiene rubber with high 1,2-cis content. This parameter optimization allows the compound to maintain flexibility and adhesion at low temperatures for snow performance while exhibiting low hysteresis loss for reduced rolling resistance.
Solution Approach 2:
The invention applies local quality by having different rubber components contribute to different performance aspects: the polybutadiene rubber with high 1,2-cis content primarily provides low rolling resistance through its molecular structure, while the natural rubber or isoprene rubber maintains good adhesion and flexibility for snow performance.
3Reliability
If different kinds of polymers are used to optimize winter performance, then snow performance improves, but rolling resistance deteriorates
Solution Approach 1:
The invention changes the polymer composition parameters by specifically selecting polybutadiene rubber with ≥80 mol% 1,2-cis content, which has unique hysteresis loss characteristics. This parameter change allows achieving low rolling resistance while maintaining winter performance through the specific molecular configuration that reduces energy loss during deformation.
Solution Approach 2:
The invention utilizes the microstructural characteristics of polybutadiene rubber with high 1,2-cis content, which creates a specific molecular packing and free volume distribution. This microstructural feature reduces hysteresis loss and improves rolling resistance while maintaining the elasticity needed for snow performance.
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 improved rolling resistance and snow performance while maintaining wet grip and durability, suitable for all-season tires.
Implementation Method 1
the ratio of the syndiotactic 1, 2 polybutadiene to the carbon black is in the range of ≥ 1:8 to ≤ 1:3
Implementation Method 2
a cross-linkable rubber composition, the cross-linkable rubber composition comprising
Data Source
AI summary
Rubber composition for tyres with low rolling resistance and good winter properties The present invention relates to a cross-linkable rubber composition, a cross-linked rubber composition obtained by cross-linking such a rubber composition, a method of preparing a tyre and a tyre. In a cross-linkable rubber composition, the cross-linkable rubber composition comprises, per hundred parts by weight of rubber (phr): ≥ 91 to ≤ 99 phr of natural rubber or isoprene rubber or combination thereof, a syndiotactic 1,2 polybutadiene, and ≥ 1 to ≤ 100 phr of a filler comprising carbon black, wherein the ratio of the syndiotactic 1,2 polybutadiene to the carbon black is in the range of 1:8 to 1:3 and in that the ratio of the syndiotactic 1,2 polybutadiene to the carbon black is in the range of ≥ 1:8 to ≤ 1:3.