Aminosilane End-Modified Conjugated Diene Polymer for Tire Rubber
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Solution Overview
Problem
Conjugated diene-based polymers in rubber compositions for vehicle tires lack sufficient processability and mechanical strength, including wear resistance, which are crucial for durability and fuel economy.
Innovation Solution
An end-modified conjugated diene-based polymer is developed by coupling a conjugated diene-based polymer with an aminosilane-based end modifier, represented by Chemical Formula 1, which includes a tertiary amine group and a silica-compatible or hexane-compatible group, enhancing dispersion, wear resistance, and processability, and incorporating two carbonyl groups to prevent viscosity increase during storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional conjugated diene-based polymers are used in rubber compositions, then basic rubber properties are maintained, but processability and mechanical strength including wear resistance are insufficient
Solution Approach 1:
The patent modifies the end groups of conjugated diene-based polymers by introducing specific functional groups (amine, carboxyl, hydroxyl, or isocyanate groups) through chemical reactions. This changes the chemical parameters of the polymer ends, enabling better interaction with silica and other reinforcing agents, thereby improving both mechanical strength and processability simultaneously
Solution Approach 2:
The patent creates a composite structure by combining modified conjugated diene-based polymer end groups with silica and other reinforcing agents. The functionalized end groups form a composite interface that enhances both the mechanical properties and processability of the rubber composition through synergistic interactions
2Reliability
If various reinforcing agents are added to conjugated diene-based rubber compositions to increase performance, then mechanical strength and wear resistance improve, but processability may be affected
Solution Approach 1:
The patent introduces functional groups at the polymer ends that act as intermediaries between the polymer chains and reinforcing agents like silica. These end functional groups facilitate compatible interactions, allowing reinforcing agents to be effectively incorporated without compromising processability, thus improving reliability while maintaining ease of operation
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 end-modified polymer exhibits improved mechanical properties, fuel economy, and wear resistance, with increased Mooney viscosity and selective reaction capabilities, leading to superior tire performance.
Implementation Method 1
an end-modified conjugated diene-based polymer configured such that the end of a conjugated diene-based polymer is coupled with an aminosilane-based end modifier
Implementation Method 2
The tertiary amine group can prevent aggregation due to hydrogen bonding between hydroxyl groups on the surface of the silica
Implementation Method 3
two carbonyl groups having high reactivity are introduced to the anionic end, thereby preventing Mooney viscosity from increasing due to hydrolysis and condensation
Data Source
AI summary
Disclosed are an end-modified conjugated diene-based polymer configured such that the end of a conjugated diene-based polymer is coupled with an aminosilane-based end modifier, and a method of preparing the same.