Silane-Modified Carbon Black Rubber Mixture
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Solution Overview
Problem
Existing rubber mixtures for pneumatic vehicle tires and technical rubber items face a trade-off between improving rolling resistance and maintaining other physical properties like wet grip and elongation at break, as enhancements in one area often lead to deterioration in others.
Innovation Solution
A rubber mixture comprising synthetic diene rubber, carbon black, mercaptosilane, and a nonionic polyoxyethylene fatty acid ester surfactant, which improves carbon black dispersion and optimizes rolling resistance without negatively affecting wet grip or elongation at break.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If rolling resistance is improved, then energy efficiency increases, but wet grip and elongation at break deteriorate
Solution Approach 1:
The patent introduces a silane-modified carbon black as an intermediary substance that mediates between the conflicting requirements of low rolling resistance and good wet grip. The silane modification creates a bridging effect between the carbon black particles and the rubber matrix, enabling energy-efficient rolling while maintaining adhesion for wet grip performance.
Solution Approach 2:
The patent changes the chemical and physical parameters of carbon black through silane modification. This includes altering surface chemistry, particle structure, and interaction with rubber polymers. These parameter changes enable the carbon black to simultaneously reduce hysteresis losses (improving rolling resistance) and maintain interfacial adhesion (preserving wet grip).
2Loss of energy
If rolling resistance is improved, then energy efficiency increases, but elongation at break deteriorates
Solution Approach 1:
The silane-modified carbon black acts as a mediator that decouples the relationship between rolling resistance and elongation at break. The modification creates a flexible interface that allows polymer chains to extend and move during deformation (maintaining elongation) while still providing structural reinforcement for low rolling resistance.
Solution Approach 2:
The patent creates a composite material system where silane-modified carbon black forms a hybrid structure within the rubber matrix. This composite approach combines the reinforcement benefits of carbon black with the flexibility and adhesion enhancement provided by silane groups, achieving both low rolling resistance and high elongation at break.
3Loss of energy
If carbon black dispersion is improved, then rolling resistance decreases, but mixture complexity increases
Solution Approach 1:
The silane modification serves as an intermediary that simplifies the mixing process while improving dispersion. The silane groups act as compatibilizers that reduce agglomeration tendencies of carbon black, enabling uniform distribution without requiring complex multi-stage mixing procedures or additional dispersing agents.
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 while maintaining or enhancing other physical properties, such as elongation at break, thereby resolving the conflicting objectives between rolling resistance and wet grip.
Implementation Method 1
the amphiphilic compound is a nonionic surfactant and where the nonionic surfactant is a polyoxyethylene fatty acid ester. Surprisingly, it was found that such a rubber mixture has optimized rolling resistance behavior without negatively affecting other physical properties such as wet grip or elongation at break. The combination of at least one silane and at least one amphiphilic compound in a rubber mixture containing carbon black leads to improved dispersion of the carbon black in synthetic diene rubbers
Implementation Method 2
The combination of at least one silane and at least one amphiphilic compound in a rubber mixture containing carbon black leads to improved dispersion of the carbon black in synthetic diene rubbers, which in turn is reflected in the advantages already mentioned
Data Source
AI summary
The invention relates to a rubber mixture, in particular for vehicle pneumatic tyres, straps, belts and hoses. The rubber mixture contains the following constituents: at least one synthetic diene rubber; at least one carbon black; at least one silane; and at least one amphiphilic compound. The rubber mixture ameliorates the target conflict between rolling resistance and wet grip.