Functionalized SBR Rubber Mixture for Tire Rolling Resistance
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Solution Overview
Problem
Existing rubber mixtures for pneumatic vehicle tires, belts, and hoses face challenges in balancing improved rolling resistance with other critical properties like wet grip, dry braking, and wear behavior, particularly under high mechanical loads.
Innovation Solution
A rubber compound comprising 60 to 100 phr of fully or partially functionalized styrene butadiene rubber, 0 to 40 phr of another polar or non-polar rubber, 0.01 to 20 phr of carbon black, 30 to 300 phr of silica, 0.1 to 40 phr of mercaptosilane, and 0.1 to 10 phr of a substance with partially passivating ligands, such as propanediol or metal-free fatty acid amides, to enhance rolling resistance and abrasion behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silica is used to replace carbon black in rubber mixtures, then wet grip and dry braking are improved, but rolling resistance deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the silica-to-carbon black ratio, silica surface treatment, and compound composition to optimize the balance between wet grip and rolling resistance. Specific parameters such as silica particle size, surface area, and organic modifier content are adjusted to achieve desired performance characteristics.
Solution Approach 2:
The patent uses composite materials by combining silica and carbon black in specific ratios, along with organic modifiers and other additives, to create a synergistic rubber compound that achieves both improved wet grip and acceptable rolling resistance characteristics.
2Reliability
If silica is used to replace carbon black in rubber mixtures, then wet grip is improved, but wear behavior deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the silica particle characteristics (size, surface area, distribution) and compound formulation to achieve a balance between wet grip enhancement and wear resistance maintenance.
Solution Approach 2:
The patent uses composite materials by combining silica with carbon black and organic modifiers in specific proportions to create a rubber compound that provides both improved wet grip and adequate wear resistance through synergistic interactions between components.
3Use of energy by moving object
If plasticizers are added to rubber mixtures to improve flow properties, then processing energy is reduced, but physical properties of the mixture may deteriorate
Solution Approach 1:
The patent applies parameter changes by carefully controlling the type and amount of plasticizer added to the rubber compound, optimizing the balance between processing ease and final product physical properties. Specific parameters such as plasticizer molecular weight, polarity, and concentration are adjusted to achieve desired outcomes.
Solution Approach 2:
The patent uses intermediary substances such as organic modifiers and coupling agents that mediate between the plasticizer and rubber matrix, allowing improved processing properties while minimizing negative impacts on physical performance through intermediate chemical interactions.
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 described rubber mixture significantly improves rolling resistance and abrasion behavior while maintaining other essential properties, as demonstrated by comparative test specimens showing enhanced normalized abrasion values and loss factor tan δ.
Implementation Method 1
0.01 to 20 phr of at least one carbon black and 30 to 300 phr of at least one silica
Implementation Method 2
attempts have been made to influence the vulcanizate properties by modifying the preparation of the mixture
Implementation Method 3
0.1 to 40 phr of at least one mercaptosilane
Implementation Method 4
at least one mercaptosilane and 0.1 to 10 phr of at least one substance A which contains partially passivating ligands which affect the reactivity of the functional groups of the styrene-butadiene rubber
Implementation Method 5
0.1 to 10 phr of at least one substance A which contains partially passivating ligands which affect the reactivity of the functional groups of the styrene-butadiene rubber
Implementation Method 6
the rubber composition of the tread determines to a large extent the driving properties of a tire
Implementation Method 7
attempts have been made to influence the vulcanizate properties by modifying the preparation of the mixture
Data Source
AI summary
The invention relates to a rubber compound, in particular for vehicle tires, belts and straps. The rubber compound is characterized by the following composition: - 60 to 100 phr of at least one fully or partially functionalized styrene-butadiene rubber and - 0 to 40 phr of at least one further polar or non-polar rubber and - 0.01 to 20 phr of at least one carbon black and - 1 to 300 phr of at least one silica and - 0.1 to 40 phr of at least one mercaptosilane and - 0.1 to 10 phr of at least one substance A containing partially passivating ligands that influence the reactivity of the functional groups of the styrene-butadiene rubber, and - further additives.