Modified Conjugated Diene Polymer for Wet Grip and Low Hysteresis
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Solution Overview
Problem
Conventional conjugated diene-based polymers used in tire rubber face challenges with low wet skid resistance and high hysteresis loss, limiting their effectiveness in reducing fuel consumption and improving tire performance.
Innovation Solution
A modified conjugated diene-based polymer is developed with a first chain derived from a conjugated diene-based monomer and a second chain derived from a compound represented by Formula 1 or Formula 2, coupled by an alkoxysilane-based modifier, enhancing filler affinity and introducing functional groups like amine groups separately from the modifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional conjugated diene-based polymers are used to reduce rotation resistance and hysteresis loss, then fuel consumption is reduced, but wet skid resistance deteriorates
Solution Approach 1:
The patent creates a composite polymer structure by coupling a conjugated diene-based polymer chain with an aminoalkoxysilane modifier chain through a silane bridge. This composite structure combines the low hysteresis loss characteristics of conjugated diene polymers with the wet skid resistance properties provided by the aminoalkoxysilane component, resolving the contradiction between fuel efficiency and wet grip performance
Solution Approach 2:
The silane group in the aminoalkoxysilane modifier acts as an intermediary that couples the conjugated diene polymer chain with filler particles (such as silica). This intermediary structure enhances the polymer-filler interaction, improving wet skid resistance while maintaining the low hysteresis loss of the base polymer, thus resolving the contradiction between fuel consumption and wet grip
2Reliability
If the number of amine groups in the modifier increases to maximize filler dispersibility and reactivity, then filler affinity is improved, but solubility in hydrocarbon solvent decreases and modification reaction becomes difficult
Solution Approach 1:
The patent introduces amine groups at specific local positions on the polymer chain through the aminoalkoxysilane modifier rather than throughout the entire polymer structure. This localized placement of functional groups provides sufficient filler affinity and dispersibility while maintaining the overall solubility and processability of the polymer, resolving the contradiction between filler interaction and manufacturing ease
Solution Approach 2:
The patent optimizes the parameters of the aminoalkoxysilane modifier, including the number and position of amine groups, the structure of the alkoxysilane group, and the molecular weight of the modifier chain. By carefully adjusting these parameters, the patent achieves a balance between filler affinity (through adequate amine group content) and solubility/reactivity (through controlled modifier structure), enabling successful modification reactions while maintaining good filler interaction
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 exhibits excellent tensile properties, viscoelasticity, and processability, maintaining stability and performance over time, while improving tire rubber composition properties.
Implementation Method 1
a modified conjugated diene-based polymer including a first chain including a repeating unit derived from a conjugated diene-based monomer, a second chain including a repeating unit derived from a compound represented by Formula 1 or Formula 2, and a derived unit from an alkoxysilane-based modifier, wherein the first chain and the second chain are coupled by the derived unit of the modifier
Data Source
AI summary
The present invention relates to a modified conjugated diene-based polymer having excellent processability and good tensile strength and viscoelasticity, and a rubber composition including the same, and provides a modified conjugated diene-based polymer including a first chain including a repeating unit derived from a conjugated diene-based monomer; a second chain including a repeating unit derived from a compound represented by Formula 1 or Formula 2; and a derived unit from an alkoxysilane-based modifier, wherein the first chain and the second chain are coupled by the derived unit from the modifier.