Functionalized SBR Rubber Mixture for Tire Tread
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Solution Overview
Problem
Existing rubber mixtures for pneumatic vehicle tires, belts, and hoses face challenges in balancing abrasion behavior, rolling resistance, and dry braking performance, with improvements in one area often leading to deterioration in others.
Innovation Solution
A rubber mixture composition comprising 40-95 phr of fully or partially functionalized styrene-butadiene rubber, 5-60 phr of another polar or non-polar rubber, 0.01-35 phr of carbon black, 10-250 phr of silica with a specific surface area, and 0.1-100 phr of a liquid polymer with a low average molecular weight and low glass transition temperature, which maintains or improves rolling resistance and dry braking while significantly enhancing abrasion behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silica is used to replace carbon black in rubber mixtures to improve wet grip and dry braking, then braking performance is improved, but rolling resistance deteriorates
Solution Approach 1:
The patent changes the surface area parameter of silica from conventional high values (200-400 m²/g) to a specific range (300-400 m²/g) and controls the silica content within 10-250 phr. This parameter optimization allows achieving improved braking performance while minimizing the negative impact on rolling resistance through precise control of silica characteristics and dosage.
Solution Approach 2:
The patent creates a composite rubber mixture containing both carbon black (0.01-35 phr) and silica (10-250 phr) in specific proportions, along with functionalized styrene-butadiene rubber (40-95 phr) and other polar or non-polar rubber (5-60 phr). This composite approach leverages the complementary properties of different fillers and rubber types to balance braking performance and rolling resistance.
2Strength
If silica is increased to improve abrasion behavior, then abrasion resistance is improved, but rolling resistance and dry braking deteriorate
Solution Approach 1:
The patent optimizes the silica surface area parameter to a specific range (300-400 m²/g) rather than using maximum surface area values. This controlled parameter change enables achieving adequate abrasion resistance while preventing excessive rolling resistance, demonstrating that optimal rather than maximum filler surface area is beneficial.
Solution Approach 2:
The patent applies different filler types and concentrations to different functional requirements: carbon black (0.01-35 phr) and silica (10-250 phr) are used in specific proportions to provide localized reinforcement for abrasion resistance, while the functionalized styrene-butadiene rubber (40-95 phr) provides localized improvement in wet grip and rolling resistance characteristics.
3Reliability
If functionalized styrene-butadiene rubber is used to improve wet grip and winter properties, then winter performance is improved, but rolling resistance and dry braking worsen
Solution Approach 1:
The patent uses functionalized styrene-butadiene rubber with specific functional group content and controls it within 40-95 phr of the total rubber composition. This parameter control ensures sufficient winter performance and wet grip improvement while limiting the negative impact on rolling resistance and dry braking that would occur with higher concentrations.
Solution Approach 2:
The patent creates a multi-component composite system combining functionalized styrene-butadiene rubber (40-95 phr), other polar or non-polar rubber (5-60 phr), carbon black (0.01-35 phr), and silica (10-250 phr). This composite approach distributes the functional requirements across different components, allowing winter performance improvement without excessive penalty in rolling resistance.
Data Source
AI summary
The invention relates to a rubber compound, in particular for vehicle tires, belts, straps and hoses. The rubber compound is characterized by the following composition: - 40 to 95 phr of at least one fully or partially functionalized styrene-butadiene rubber and - 5 to 60 phr of at least one further polar or non-polar rubber and - 0.01 to 35 phr of at least one carbon black and - 10 to 250 phr of at least one silica with a CTAB surface area according to ASTM D 3765 between 170 and 400 m²/g and - 0.1 to 100 phr of at least one liquid polymer with a mean molecular weight Mw between 150 and 1500 g/mol and a glass transition temperature Tg less than or equal to -30°C and - further additives.