Sulfur-Curable Tire Rubber Composition for Aging Crack Resistance
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Solution Overview
Problem
Existing sulfur-curing rubber compounds for vehicle tires, belts, and hoses fail to meet current requirements for wet grip, rolling resistance, abrasion, durability, crack, and cut resistance, particularly after aging.
Innovation Solution
A sulfur-curable rubber compound comprising 40 to 80 phr of polyisoprene, 10 to 40 phr of amino-functionalized butadiene rubber with less than 80% cis content, and 10 to 50 phr of functionalized SBR rubber, preferably SSBR, is used to enhance interaction with carbon black, reducing silica and resin content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sulfur-curing rubber compounds are used, then basic rubber properties are maintained, but crack and cut resistance deteriorates after aging
Solution Approach 1:
The patent uses a triblend composite of three specific rubbers (polyisoprene, amino-functionalized butadiene rubber with low cis content, and functionalized SBR) to achieve superior crack and cut resistance after aging. This composite material combines the advantages of each rubber type: polyisoprene provides good aging resistance, amino-functionalized butadiene rubber enhances crack resistance through specific chemical interactions, and functionalized SBR contributes to overall durability. The synergistic effect of this composite formulation resolves the contradiction between maintaining basic properties and improving long-term crack/cut resistance.
Solution Approach 2:
The patent specifies precise parameter ranges for each rubber component (40-80 phr polyisoprene, 10-40 phr amino-functionalized butadiene rubber with cis content <80%, 10-50 phr functionalized SBR) to optimize the balance between immediate crack resistance and long-term durability after aging. By controlling the cis content of butadiene rubber below 80% and specifying exact proportion ranges, the formulation achieves parameter optimization that simultaneously improves both short-term and long-term crack and cut resistance.
2Reliability
If triblend rubber compounds are used, then some durability properties are improved, but wet grip and rolling resistance deteriorate
Solution Approach 1:
The patent carefully adjusts the parameter ranges of each rubber component to balance durability improvement with wet grip and rolling resistance. The specific cis content limitation (<80%) for butadiene rubber and the defined proportion ranges (40-80 phr polyisoprene, 10-40 phr amino-functionalized butadiene, 10-50 phr functionalized SBR) are optimized to ensure that durability enhancement does not come at the cost of wet grip and rolling resistance performance.
Solution Approach 2:
The patent applies local quality by selecting rubbers with specific functional characteristics for specific performance requirements: polyisoprene for aging resistance, amino-functionalized butadiene for crack resistance, and functionalized SBR for overall durability, while maintaining the right balance to preserve wet grip and rolling resistance properties.
3Ease of manufacture
If amino-functionalized butadiene rubber with high cis content is used, then processability is improved, but crack resistance deteriorates
Solution Approach 1:
The patent identifies and controls the critical parameter of cis content in amino-functionalized butadiene rubber, specifying it must be less than 80%. This parameter change optimizes the balance between processability and crack resistance. The formulation uses this constrained cis content range to achieve both adequate processability and superior crack resistance, resolving the contradiction between these two properties.
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 compound achieves improved crack and cut resistance, maintains high abrasion and wet grip, and enhances rolling resistance, with significant improvements after aging, making it suitable for vehicle tires and other rubber products.
Implementation Method 1
enhance interaction with carbon black
Implementation Method 2
sulfur-crosslinkable rubber compound
Data Source
AI summary
The present invention relates to a sulfur-crosslinkable rubber mixture comprising 40 to 80 phr of at least one polyisoprene, 10 to 40 phr of at least one butadiene rubber which is amino-functionalized and has a cis content of less than 80%, and 10 to 50 phr of at least one functionalized SBR rubber, a vulcanizate, a component and a corresponding vehicle tire.