Studless Winter Tire Tread Compound for Ice Grip and Bloom Control
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Solution Overview
Problem
Existing studless winter tires face challenges in achieving a balanced improvement of performance on ice and wet grip performance across a wide temperature range while minimizing chemical blooming and maintaining sufficient strength and abrasion resistance.
Innovation Solution
A tread rubber composition for studless winter tires comprising isoprene-based rubber, polybutadiene rubber, styrene butadiene rubber, a water-soluble fine particle, and a liquid plasticizer, with specific ratios and formulations to enhance flexibility, water drainage, and rigidity, ensuring performance on ice and wet grip across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polybutadiene rubber content is increased to improve ice performance, then grip on ice is enhanced, but chemical blooming occurs and abrasion resistance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by introducing styrene butadiene rubber (1-10 parts by mass) alongside polybutadiene rubber (20-60 parts by mass), and adjusts the plasticizer content to more than 30 parts by mass per 100 parts by mass of rubber component. This parameter adjustment allows achieving ice grip performance while suppressing chemical blooming through the synergistic effect of SBR and controlled plasticizer content.
Solution Approach 2:
The patent uses a composite rubber system combining polybutadiene rubber, styrene butadiene rubber, and isoprene-based rubber in specific proportions. This composite material approach allows the benefits of polybutadiene (ice grip) to be realized while the SBR component suppresses chemical blooming and improves abrasion resistance, creating a synergistic effect that resolves the contradiction.
2Reliability
If polybutadiene rubber content is increased to improve ice performance, then grip on ice is enhanced, but abrasion resistance deteriorates
Solution Approach 1:
The patent employs a composite rubber formulation where styrene butadiene rubber (1-10 parts by mass) and isoprene-based rubber (10-50 parts by mass) are combined with polybutadiene rubber. This composite structure provides ice grip through polybutadiene while SBR and isoprene rubber components maintain abrasion resistance and overall strength.
Solution Approach 2:
The patent optimizes the ratio of rubber components and plasticizer content (more than 30 parts by mass per 100 parts by mass of rubber component) to achieve a balance between ice performance and abrasion resistance. The specific parameter ranges ensure sufficient natural rubber content is maintained for strength while polybutadiene provides ice grip.
3Temperature
If softener content is increased to enhance softening effect, then low-temperature flexibility is improved, but chemical blooming occurs
Solution Approach 1:
The patent specifies liquid plasticizer content at more than 30 parts by mass per 100 parts by mass of rubber component, which provides sufficient softening effect for low-temperature flexibility. The combination with SBR (1-10 parts by mass) controls chemical blooming while maintaining the required softness and flexibility at low temperatures.
Data Source
AI summary
The present invention provides a rubber composition for studless winter tires that provides a balanced improvement of performance on ice and wet grip performance, regardless of temperature, and a studless winter tire including the rubber composition. The present invention relates to a tread rubber composition for studless winter tires, containing: a rubber component including an isoprene-based rubber, a polybutadiene rubber, and a styrene butadiene rubber; a water-soluble fine particle; and a liquid plasticizer, the styrene butadiene rubber being present in an amount of 1 to 10% by mass based on 100% by mass of the rubber component, the liquid plasticizer being present in an amount of more than 30 parts by mass per 100 parts by mass of the rubber component.