Ester-Functional 1,3-Dipolar Rubber Composition for Low Hysteresis
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Solution Overview
Problem
Rubber compositions for tire treads face challenges in achieving a balance between cohesion, rigidity, and hysteresis, as increasing reinforcing fillers or reducing plasticizers to enhance these properties leads to increased viscosity and manufacturing issues.
Innovation Solution
A rubber composition based on diene elastomers, a reinforcing inorganic filler, and a 1,3-dipolar compound such as nitrile oxides, nitrile imines, or nitrones, characterized by a specific chemical structure, which optimizes the balance between cohesion, rigidity, and hysteresis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If relatively high levels of reinforcing fillers are introduced into the rubber compound to achieve good cohesion and stiffness, then cohesion and rigidity are improved, but hysteresis increases and manufacturing becomes more difficult due to increased viscosity
Solution Approach 1:
The invention changes the chemical structure of the 1,3-dipolar compound by introducing ester functions with specific carbon groups containing heteroatoms. This structural modification alters the interaction between the compound and rubber molecules, achieving lower hysteresis while maintaining cohesion through optimized molecular parameters rather than simply increasing filler content
Solution Approach 2:
The invention creates a composite system combining diene elastomer with specifically modified 1,3-dipolar compounds containing ester functions. This composite approach allows the ester-functionalized compound to act as both a cohesive enhancer and a hysteresis reducer, resolving the contradiction between strength and energy loss
2Stress or pressure
If relatively high levels of reinforcing fillers are introduced into the rubber compound to achieve good cohesion and stiffness, then cohesion and rigidity are improved, but manufacturing becomes more difficult due to increased viscosity
Solution Approach 1:
The invention modifies the 1,3-dipolar compound with ester functions that optimize the balance between rigidity enhancement and processability. The specific carbon groups containing heteroatoms in the ester functionality tune the compound's interaction with rubber, providing sufficient rigidity while preventing excessive viscosity increase that would hinder manufacturing
Solution Approach 2:
The ester-functionalized 1,3-dipolar compound acts as an intermediary substance between the rubber matrix and reinforcing fillers. It mediates the interaction by providing both cohesive enhancement and viscosity control, facilitating easier manufacturing while achieving the desired rigidity
3Strength
If the amount of plasticizer in the rubber compound is reduced to achieve good cohesion and stiffness, then cohesion and rigidity are improved, but hysteresis increases and manufacturing becomes more difficult
Solution Approach 1:
The invention changes the chemical parameters of the 1,3-dipolar compound by incorporating ester functions with specific carbon groups. This modification allows the compound to maintain cohesion at lower plasticizer levels while preserving processability, as the ester functionality provides optimal molecular interactions without excessive viscosity or hysteresis
Data Source
AI summary
The invention relates to a 1,3-dipolar compound comprising an ester function of carboxylic acid, and to a dienic rubber composition reinforced by an inorganic charge. Such a composition has an improved compromise of rigidity, cohesion and hysteresis properties.