Conjugated-diene-based polymer, composition of conjugated-diene-based polymer, crosslinked rubber object, and tire
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Solution Overview
Problem
Conjugated diene-based polymers used in tire production offer improved fuel efficiency but suffer from insufficient processability, necessitating a solution that enhances both fuel efficiency and processing characteristics.
Innovation Solution
A conjugated diene-based polymer with controlled shrinkage factors and adsorption degrees on silica, specifically within the ranges of 0.4 to 0.8 for high molecular weight molecules and 40 to 100% for medium molecular weight molecules, along with a method involving polymerization steps and coupling reactions to achieve a cross-linked rubber with improved processability and fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conjugated diene-based polymer is used to improve fuel efficiency, then fuel efficiency is improved, but processability becomes insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the shrinkage factor of high molecular weight molecules (0.4 to 0.8) and the degree of adsorption onto silica (75% or less for high molecular weight, 40 to 100% for medium molecular weight). These parameter optimizations enable the polymer to simultaneously achieve high fuel efficiency and improved processability, resolving the technical contradiction between the two properties.
2Ease of manufacture
If the shrinkage factor of high molecular weight molecules is reduced to improve processability, then processability is improved, but fuel efficiency may be compromised
Solution Approach 1:
The patent identifies the shrinkage factor as a critical parameter and optimizes it to a specific range (0.4 to 0.8). This parameter optimization ensures that high molecular weight molecules have sufficient compactness to improve processability while maintaining the structural characteristics necessary for fuel efficiency, thus resolving the contradiction between these two properties.
Solution Approach 2:
The patent applies local quality by differentiating the properties of high molecular weight molecules from medium molecular weight molecules. Specifically, it controls the shrinkage factor of high molecular weight molecules (0.4 to 0.8) while allowing medium molecular weight molecules to have a shrinkage factor of 0.8 to 1.2. This localized optimization enables each molecular weight range to contribute differently to both processability and fuel efficiency.
3Use of energy by moving object
If the degree of adsorption onto silica is increased to improve fuel efficiency, then fuel efficiency is improved, but processability deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the adsorption behavior of high molecular weight molecules from medium molecular weight molecules. It controls the degree of adsorption of high molecular weight molecules onto silica to be 75% or less (preferably 10 to 70%), while controlling the degree of adsorption of medium molecular weight molecules to be 40 to 100%. This differentiated control allows the polymer to achieve high fuel efficiency through selective adsorption while maintaining good processability.
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 solution provides a conjugated diene-based polymer that enhances both the processability and fuel efficiency of cross-linked rubber, suitable for tire applications, by optimizing molecular weight distributions and adsorption properties on silica.
Implementation Method 1
a second step of partially converting the polymer chains having an active terminal prepared in the first step into coupled polymer chains by a coupling reaction
Implementation Method 2
a degree of adsorption of high molecular weight molecules onto silica of 75% or less, and a degree of adsorption of medium molecular weight molecules onto silica of 40 to 100%
Data Source
AI summary
A conjugated diene-based polymer including at least conjugated diene monomer units, and having a shrinkage factor of high molecular weight molecules of 0.4 to 0.8, a degree of adsorption of high molecular weight molecules onto silica of 75% or less, and a degree of adsorption of medium molecular weight molecules of 40 to 100%.