Tire Tread Elastomer Composition for Crack Resistance
Solution Overview
Problem
Tire treads experience crack propagation due to mechanical stress and contact with the ground, leading to reduced tread life, and existing solutions like natural rubber do not fully address the issue of crack resistance without compromising other performance metrics.
Innovation Solution
A tire tread composition featuring a polyisoprene-based elastomer matrix with a modified diene elastomer containing alkoxysilane groups and nitrogen-functional species, combined with a reinforcing filler like carbon black, to enhance crack resistance without deteriorating wear and rolling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural rubber is used in the tread to improve crack propagation resistance, then crack resistance is improved, but other performance metrics such as wear and rolling resistance may deteriorate
Solution Approach 1:
The patent uses a composite elastomer system combining polyisoprene (natural rubber) with a modified diene elastomer containing specific functional groups (silane and nitrogen-containing). This composite approach allows the tread to achieve superior crack propagation resistance while maintaining acceptable wear and rolling resistance properties, as the synergistic interaction between the two elastomers provides both durability and performance characteristics that neither material alone could achieve.
2Reliability
If the tread composition is modified to improve crack resistance, then crack propagation resistance is improved, but the complexity of the composition increases
Solution Approach 1:
The patent modifies the diene elastomer by introducing specific functional groups (silane groups and nitrogen-containing groups) at controlled levels. This parameter change approach allows improvement of crack propagation resistance through chemical modification rather than complete composition replacement, thereby managing complexity while achieving the desired performance enhancement.
3Ease of manufacture
If existing elastomer compositions are used, then manufacturing is simpler, but crack propagation resistance is insufficient
Solution Approach 1:
The patent incorporates silane-modified polyisoprene as a pre-modified elastomer component, where the silane modification is performed during polymerization. This preliminary action ensures that the elastomer already possesses enhanced crack resistance properties before being compounded into the tread, simplifying the overall manufacturing process while achieving superior reliability compared to post-modification approaches.
Data Source
AI summary
The invention concerns a tyre tread that comprises a composition made from at least: - an elastomer matrix comprising a polyisoprene and a modified diene elastomer, said modified diene elastomer comprising, in the structure of same, at least one alkoxysilane group bonded to the elastomer by the silicon atom, and at least one function comprising a nitrogen atom, and - a reinforcing filler comprising carbon black as the main filler. Integrated into a tyre, such a tread helps improve crack propagation resistance.