Vulcanized Rubber Composition Using Guanidine Compounds
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Solution Overview
Problem
Conventional rubber compositions used in tires face challenges in enhancing both wet grip performance and reducing rolling resistance, as they require specific adjustments to loss tangent values at 0°C and 60°C.
Innovation Solution
A method for producing a vulcanized rubber composition involving a kneading process with natural or synthetic rubber, an inorganic filler, and a sulfur-containing silane coupling agent, where specific compounds represented by formulae (1), (2), and (3) are added to control the glass transition temperature within a specific range, thereby adjusting the loss tangent values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional rubber compositions are used with inorganic filler and silane coupling agent, then basic tire requirements are met, but both rolling resistance and wet grip performance cannot be simultaneously optimized
Solution Approach 1:
The invention changes the chemical composition parameters by introducing specific guanidine compounds (aminoguanidine, 1,3-diaminoguanidine, or their salts) into the rubber composition. This chemical parameter change modifies the rubber's viscoelastic properties, enabling simultaneous optimization of wet grip (higher loss tangent at 0°C) and rolling resistance (lower loss tangent at 60°C) through controlled glass transition temperature adjustment
Solution Approach 2:
The invention creates a composite rubber composition system combining rubber components, inorganic fillers, silane coupling agents, and guanidine compounds. This multi-component composite approach allows synergistic effects where the guanidine compounds interact with both the rubber matrix and filler-silane system to achieve optimized performance at multiple temperature points
2Adaptability or versatility
If loss tangent at 0°C is enhanced to improve wet grip, then wet grip performance improves, but loss tangent at 60°C increases leading to higher rolling resistance
Solution Approach 1:
The invention achieves independent control of loss tangent at different temperatures by adjusting the glass transition temperature through guanidine compound addition. The specific chemical structure and concentration of guanidine compounds allow precise tuning of the rubber's viscoelastic response, creating a non-monotonic relationship between temperature and loss tangent that optimizes both wet grip and rolling resistance
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 method effectively enhances the loss tangent at 0°C while reducing it at 60°C, improving wet grip performance and reducing rolling resistance, thus enhancing the tire's performance.
Implementation Method 1
wherein X is an acid that forms a salt together with a guanidine moiety
Implementation Method 2
a vulcanization step of vulcanizing the unvulcanized rubber composition to thereby obtain a vulcanized rubber composition
Data Source
AI summary
Provided is a method for producing a vulcanized rubber composition, including: a first kneading step of obtaining a kneaded mixture comprising a rubber component comprising at least one selected from the group consisting of natural rubbers and synthetic rubbers, a filler comprising an inorganic filler, and a sulfur-containing silane coupling agent; a second kneading step of adding sulfur and a vulcanization accelerator to the kneaded mixture, followed by kneading, to thereby obtain an unvulcanized rubber composition; and a vulcanization step of vulcanizing the unvulcanized rubber composition to thereby obtain a vulcanized rubber composition having a glass transition temperature of -30°C to 0°C by; wherein specific aminoguanidines are added, followed by kneading, in the first kneading step.