Functionalized SBR Rubber Mixture for Tire Rolling Resistance
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Solution Overview
Problem
Existing rubber mixtures for vehicle tires, straps, belts, and hoses face challenges in optimizing rolling resistance and wear behavior while maintaining other tire properties such as wet grip, tear resistance, and winter performance, as improvements in one property often lead to deterioration in others.
Innovation Solution
A rubber mixture comprising 5 to 95 phr of styrene-butadiene rubber functionalized with phthalocyanine, hydroxy, or silane sulfide groups, combined with 20 to 300 phr of silica, which improves rolling resistance and wear behavior without compromising other properties, and can include additional rubbers and fillers to enhance overall performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the glass transition temperature of the rubber mixture is reduced to improve rolling resistance, then rolling resistance behavior is improved, but wet grip behavior and tear properties deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the glass transition temperature within a specific range (−50° C. to −105° C.) and styrene content (0.1 wt % to 12 wt %) to optimize the balance between rolling resistance and wet grip behavior, avoiding the extremes that cause property deterioration
Solution Approach 2:
The patent uses composite materials by combining styrene-butadiene rubber with specific functional groups (phthalocyanine, hydroxy, epoxy, or silane sulfide groups) and silica filler to achieve improved rolling resistance while maintaining wet grip and tear properties through synergistic interactions between components
2Loss of energy
If the glass transition temperature of the rubber mixture is reduced to improve rolling resistance, then rolling resistance behavior is improved, but wear properties and tear properties deteriorate
Solution Approach 1:
The patent optimizes the glass transition temperature range (−50° C. to −105° C.) and styrene content (0.1 wt % to 12 wt %) to achieve improved rolling resistance while preventing the deterioration of wear and tear properties that occurs at lower temperatures
Solution Approach 2:
The patent employs composite materials consisting of functionalized styrene-butadiene rubber and silica filler that work synergistically to provide low rolling resistance while simultaneously maintaining high wear and tear resistance
3Reliability
If silica is used to replace carbon black to improve road properties, then wet grip and dry braking are improved, but rolling resistance and wear behavior deteriorate
Solution Approach 1:
The patent creates a composite material system where functionalized styrene-butadiene rubber and silica filler work together to achieve the beneficial effects of silica (improved wet grip) while compensating for its detrimental effects (increased rolling resistance) through the specific functional groups on the rubber
Solution Approach 2:
The patent adjusts the glass transition temperature and styrene content parameters of the styrene-butadiene rubber to optimize the balance between wet grip improvement from silica and rolling resistance minimization
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 rubber mixture achieves improved rolling resistance and wear behavior while maintaining or enhancing wet grip, tear, and winter properties, providing a balanced set of tire characteristics.
Implementation Method 1
The invention relates to a sulfur-crosslinkable rubber mixture
Data Source
AI summary
A sulfur-crosslinkable rubber mixture, in particular for pneumatic vehicle tires, straps, belts, and hoses, is disclosed which exhibits, among other things, improved rolling resistance behavior. The rubber mixture contains at least the following constituents: 5 to 95 phr of at least one styrene-butadiene rubber, which is functionalized with phthalocyanine groups and/or hydroxy groups and/or epoxy groups and/or silane-sulfide groups and the styrene content of which is 0 to 12 wt % and which has a glass transition temperature (Tg) according to DSC of −75 to −120° C. in the unvulcanized state, 5 to 95 phr of at least one further rubber, and 20 to 300 phr of at least one silica.