Amine-Modified Diene Polymer for Tire Heat Build-Up Resistance
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Solution Overview
Problem
Current rubber compositions for vehicle tires lack improved heat build-up resistance, high tensile strength, wear resistance, and wet skid resistance, which are essential for enhanced durability, stability, and fuel economy.
Innovation Solution
A modified conjugated diene-based polymer is developed using an anionic polymerization initiator, specifically through polymerizing a conjugated diene monomer and an aromatic vinyl monomer in the presence of a hydrocarbon solvent, followed by modification with an amine-containing compound, resulting in a polymer with improved compatibility and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rubber compositions are used for vehicle tires, then basic tire functionality is maintained, but heat build-up resistance, tensile strength, wear resistance, and wet skid resistance are insufficient
Solution Approach 1:
The patent modifies the chemical structure of conjugated diene-based polymers by introducing specific functional groups (amino, carboxyl, hydroxyl groups) at the polymer chain ends through controlled anionic polymerization. This chemical parameter change enables the polymer to exhibit improved heat build-up resistance, tensile strength, and wear resistance while maintaining good processability during tire manufacturing
Solution Approach 2:
The invention creates a composite polymer structure by combining conjugated diene-based polymer chains with functional end groups (amino, carboxyl, or hydroxyl groups). This composite structure integrates the elasticity of the diene polymer with the reactive properties of the functional groups, achieving both improved mechanical properties and compatibility with tire additives
2Strength
If conventional rubber compositions are used for vehicle tires, then basic tire functionality is maintained, but tensile strength and wear resistance are insufficient
Solution Approach 1:
The patent applies local quality modification by introducing functional groups only at the end positions of the polymer chains rather than throughout the entire polymer structure. This localized modification (at the chain ends) provides enhanced tensile strength and wear resistance while keeping the bulk polymer structure simple and maintaining good processing characteristics
3Reliability
If conventional rubber compositions are used for vehicle tires, then basic tire functionality is maintained, but wet skid resistance is insufficient
Solution Approach 1:
The patent changes the surface chemical parameters of the polymer by introducing polar functional groups (amino, carboxyl, hydroxyl) at the chain ends. This parameter change improves wet skid resistance through enhanced adhesion to road surfaces while the controlled amount of functional groups (0.1-10 mmol/kg polymer) ensures that processability during manufacturing is not significantly compromised
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 modified polymer composition exhibits enhanced heat build-up resistance, high tensile strength, wear resistance, and wet skid resistance, leading to improved tire performance with reduced rolling resistance and superior fuel economy.
Implementation Method 1
polymerizing a conjugated diene monomer or a conjugated diene monomer and an aromatic vinyl monomer using a hydrocarbon solvent in the presence of a compound represented by Chemical Formula 4 below, thus forming an active polymer having an alkali metal end
Implementation Method 2
modifying the active polymer having the alkali metal end with a compound represented by Chemical Formula 5, 6 or 7 below: in Chemical Formula 5, R 1 in Chemical Formula 6, R 1 in Chemical Formula 7, A is an amine-containing functional group
Data Source
AI summary
Disclosed are an anionic polymerization initiator, which is an organo-alkali metal compound having an anionic end including an amine group, a method of preparing a modified conjugated diene-based polymer using the same, and a rubber composition including the modified conjugated diene-based polymer prepared thereby.