Winter Tire Tread Composition Balancing Snow Grip and Tread Wear
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Solution Overview
Problem
Snow tires face challenges in achieving a compromise between rolling resistance, grip on snow-covered and wet ground, and abrasion resistance, with existing solutions often sacrificing one property for the benefit of another.
Innovation Solution
A tire tread composition comprising an elastomeric matrix of 25-95 phr copolymer based on butadiene and styrene with a glass transition temperature less than −70° C., 5-75 phr polybutadiene, less than 15 phr isoprene elastomer, a reinforcing filler, 25-100 phr plasticizing resin with a glass transition temperature greater than 20° C., and a vulcanization system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If rubber compositions are used to manufacture semi-finished products having reduced rolling resistance, then rolling resistance is reduced, but grip performance on wet ground and snow-covered ground deteriorates
Solution Approach 1:
The invention carefully controls the glass transition temperature parameters of the elastomeric components. By selecting diene elastomers with specific Tg ranges and combining them in optimized proportions, the composition achieves a balance where the low-Tg component reduces rolling resistance through lower hysteresis losses, while the higher-Tg components ensure adequate grip performance.
Solution Approach 2:
The composite rubber composition combines elastomers with different Tg characteristics to achieve both low rolling resistance and good grip. The multi-component system allows the low-Tg diene elastomer to minimize energy losses during deformation, while the higher-Tg components maintain adhesion properties for effective gripping on various surfaces.
2Reliability
If snow or winter treads are provided with softer rubber composition to improve flexibility and grip, then grip on snow-covered ground is improved, but abrasion resistance is lowered
Solution Approach 1:
The invention creates a composite tread composition where soft diene elastomers (Tg < -70°C) provide flexibility and snow grip, while the combination with other elastomers and reinforcing fillers maintains abrasion resistance. The synergistic interaction between components allows the soft matrix to deform and adhere to snow surfaces while the overall composition resists wear through enhanced structural properties.
Solution Approach 2:
The tread composition exhibits local quality variations through its multi-component structure. The low-Tg diene elastomer provides localized softness and flexibility for grip at the contact patch, while the combined composition with higher-Tg components and fillers provides overall structural strength and abrasion resistance across the entire tread element.
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 improves grip on snow-covered ground, abrasion resistance, and maintains acceptable rolling resistance, offering a better performance compromise compared to traditional tire tread formulations.
Implementation Method 1
copolymer based on butadiene and on styrene having a glass transition temperature of less than −70° C.
Implementation Method 2
plasticizing resin having a glass transition temperature of greater than 20° C.
Implementation Method 3
an elastomeric matrix comprising from 25 to 95 phr of copolymer based on butadiene and on styrene
Data Source
AI summary
A tire exhibits an improved performance compromise, the tread of which comprises a rubber composition based on an elastomeric matrix comprising from 25 to 95 parts by weight per hundred parts by weight of elastomer, phr, of copolymer based on butadiene and on styrene having a glass transition temperature of less than −70° C., and from 5 to 75 phr of polybutadiene, the elastomeric matrix comprising less than 15 phr of isoprene elastomer; at least one reinforcing filler; from 25 to 100 phr of at least one plasticizing resin having a glass transition temperature of greater than 20° C.; and a vulcanization system.