Modified Polybutadiene Rubber Composition for Low Hysteresis and Wet Grip
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Solution Overview
Problem
Conventional rubber compositions for tires face challenges in achieving a balance between low rolling resistance and high wet skid resistance, with existing methods for measuring the modification ratio of conjugated diene-based polymers being inaccurate due to reliance on separate standard materials in gel permeation chromatography.
Innovation Solution
A rubber composition incorporating a modified conjugated diene-based polymer with a high modification ratio, controlled by the purity of the modifier, which satisfies the equation Y=A*0.6854*X+93.955, where X is the modification ratio and Y is the dynamic viscoelasticity loss coefficient at 60°C, allowing for prediction and optimization of tensile and viscoelastic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If natural rubbers, polyisoprene rubbers, or polybutadiene rubbers are used to reduce hysteresis loss, then low rolling resistance is achieved, but wet skid resistance deteriorates
Solution Approach 1:
The patent uses a composite rubber composition combining polybutadiene rubber (for low hysteresis loss) with styrene-butadiene rubber grafted with silane (for improved wet skid resistance). The silane-grafted SBR provides silica coupling capability that enhances wet grip while the polybutadiene maintains low rolling resistance through reduced hysteresis.
2Manufacturing precision
If solution polymerization is used to prepare conjugated diene-based polymers, then molecular weight and physical properties can be controlled, but measurement accuracy of modification ratio deteriorates
Solution Approach 1:
The patent replaces the conventional GPC measurement system with a 1H-NMR spectroscopy system for measuring modification ratio. This substitution provides accurate quantification of vinyl group content and modification degree without requiring separate standard materials, thereby improving measurement precision while maintaining the benefits of solution polymerization for molecular weight control.
Data Source
AI summary
The present invention relates to a rubber composition having excellent tensile properties and viscoelasticity properties and including a conjugated diene-based polymer. The rubber composition may include a modified conjugated diene-based polymer which is selected considering target tensile properties and viscoelasticity properties, by predicting in advance the correlation between the modification ratio of the modified conjugated diene-based polymer and the dynamic viscoelasticity loss coefficient at 60° C. of the rubber composition through Mathematical Formula 1 and Mathematical Formula 2. Therefore, excellent compounding properties may be shown.