Modified Polymerization Initiator for Conjugated Diene Polymers
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Solution Overview
Problem
Conventional conjugated diene-based polymers used in tire rubber materials face limitations in reducing hysteresis loss and improving abrasion resistance, while also compromising processability and wet traction.
Innovation Solution
A modified polyfunctional polymerization initiator represented by Formula 1 is developed, which includes specific cyclic saturated hydrocarbon groups and functional groups, allowing for improved reactivity and the formation of polymers with enhanced tensile strength, abrasion resistance, and wet traction when used in conjunction with silica fillers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conjugated diene-based polymers are used, then processability is maintained, but hysteresis loss reduction and abrasion resistance improvement are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of the polymer through controlled anionic polymerization. By adjusting polymerization conditions and using specific initiators, the vinyl content and molecular weight distribution are optimized to achieve both improved abrasion resistance and maintained processability. The controlled architecture of the polymer chains allows enhancement of mechanical properties without sacrificing processing characteristics.
2Loss of energy
If natural rubber is used to decrease hysteresis loss, then running resistance decreases, but wet traction is poor
Solution Approach 1:
The patent employs composite material principles by creating a conjugated diene-based polymer with specific architectural features that combine the low hysteresis loss characteristic of natural rubber with the wet traction properties needed for tire performance. The controlled polymer structure, including vinyl content and molecular weight distribution, creates a composite-like material that integrates the advantages of different rubber types while eliminating their individual disadvantages.
3Manufacturing precision
If solution polymerization SBR is prepared using anion polymerization initiator, then polymer structure control is improved, but abrasion resistance and processability improvement are insufficient
Solution Approach 1:
The patent applies local quality principles by creating polymers with specific local structural features through controlled anionic polymerization. By controlling the polymerization process to achieve specific vinyl content distributions and molecular weight patterns along the polymer chains, the invention enhances abrasion resistance while maintaining the manufacturing precision and structure control advantages of anionic polymerization.
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 polymerization initiator enables the production of conjugated diene-based polymers with improved physical properties, including increased tensile strength, abrasion resistance, and wet traction, while maintaining good processability, thereby addressing the limitations of existing technologies.
Implementation Method 1
a solution polymerization SBR is prepared using an anion polymerization initiator, and in this case, an alkyl lithium is mainly used as the anion polymerization initiator
Data Source
AI summary
The present invention relates to a polymerization initiator represented by Formula 1, a modified conjugated diene-based polymer, methods for preparing them, a rubber composition comprising the modified conjugated diene-based polymer, and a tire prepared from the rubber composition.(In Formula 1, the definition of each substituent is the same as defined in the description.)