Benzoxazine Rubber Composition for Stiff Tire Apexes With Low Hysteresis
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Solution Overview
Problem
Current rubber compositions for tire apex and chafer applications face challenges in achieving high stiffness without increasing hysteresis or compromising tear strength, which affects fuel efficiency and performance.
Innovation Solution
Incorporating benzoxazine resins into rubber compositions to enhance stiffness while maintaining low hysteresis and tear strength, allowing for their use in tire components like apexes, chafers, and high-stiffness tread blocks without compromising fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rubber compositions are used to achieve high stiffness, then the tire component structural rigidity is improved, but hysteresis increases which reduces fuel efficiency
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating 5-50 phr of aromatic polyamide fiber and 5-50 phr of polyester fiber into the rubber composition, along with specific ratios of cis-1,4-polyisoprene (30-70 parts) and cis-1,4-polybutadiene (20-50 parts). This multi-parameter composition adjustment achieves high stiffness while maintaining low hysteresis, resolving the contradiction between structural rigidity and fuel efficiency.
Solution Approach 2:
The patent creates a composite rubber material combining multiple rubber types (cis-1,4-polyisoprene and cis-1,4-polybutadiene) with two types of reinforcement fibers (aromatic polyamide fiber and polyester fiber). This composite structure provides both the required stiffness for tire apex and chafer components and low hysteresis properties for fuel efficiency, simultaneously addressing both contradictory requirements.
Data Source
AI summary
This invention is based upon the discovery that benzoxazine resins can be incorporated into certain rubber compositions to increase the stiffness thereof without increasing hysteresis or reducing tear strength. Such benzoxazine resin reinforced rubber formulations can accordingly be used beneficially in components of rubber products where high stiffness is desirable. Since these benzoxazine resin reinforced rubbers do not increase levels of hysteresis, they can be used in tires components, such as apexes, chaffers, and high stiffness tread blocks without compromising fuel efficiency. This invention more specifically reveals a radial tire having an apex, a chaffer, or a hard tread block segment which is comprised of a rubbery polymer and a benzoxazine resin.