Modified Conjugated Diene Polymer Silane Coupling
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Solution Overview
Problem
Conventional rubber materials for tires face challenges in achieving excellent wet skid resistance and abrasion resistance while maintaining good processability and tensile strength, particularly when interacting with inorganic fillers like silica, due to poor dispersibility and affinity issues.
Innovation Solution
A modified conjugated diene-based polymer is developed, incorporating a functional group derived from a specific modifier compound that enhances interaction with inorganic fillers, achieved through polymerization in a hydrocarbon solvent with an organometal compound and a modification initiator, resulting in improved tensile strength, abrasion resistance, and wet skid resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silica is used as reinforcing filler, then low hysteresis loss and wet skid resistance are improved, but dispersibility deteriorates due to poor affinity with rubber
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance that chemically bonds to both the silica filler and the rubber polymer. The silane coupling agent contains reactive groups that form chemical bonds with silica surfaces and other groups that bond with rubber, thereby improving dispersibility and affinity between the hydrophilic silica and hydrophobic rubber without compromising wet skid resistance
Solution Approach 2:
The patent modifies the surface properties of silica filler by treating it with silane coupling agents, changing its chemical and physical parameters. This treatment reduces the hydrophilicity of silica surface and improves its compatibility with hydrophobic rubber, thereby enhancing dispersibility while maintaining the low hysteresis loss and wet skid resistance properties
2Loss of energy
If natural rubber or polyisoprene is used, then low hysteresis loss is achieved, but wet skid resistance deteriorates
Solution Approach 1:
The patent creates a composite rubber material by combining natural rubber or polyisoprene with modified conjugated diene-based polymers that have been treated with silane coupling agents. This composite structure allows the base rubber to provide low hysteresis loss while the modified polymer component enhances wet skid resistance through improved filler-rubber interaction and surface properties
3Manufacturing precision
If solution polymerization is used, then molecular weight and physical properties can be controlled, but processability may deteriorate due to high molecular weight
Solution Approach 1:
The patent segments the polymer structure by introducing functional groups at specific positions along the polymer chain through controlled polymerization. This segmentation allows the polymer to maintain high molecular weight for mechanical strength while the functional groups provide sites for further modification and filler interaction, improving processability without sacrificing molecular weight control
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 enhanced processability, tensile strength, abrasion resistance, and wet skid resistance, with improved dispersibility and mechanical properties, effectively addressing the limitations of existing rubber materials.
Implementation Method 1
polymerizing conjugated diene-based monomers, or an aromatic vinyl-based monomer and a conjugated diene-based monomer, in a hydrocarbon solvent which comprises an organometal compound, to prepare an active polymer which is coupled with an organometal
Implementation Method 2
reacting the active polymer and a modifier which is a compound represented by the following Formula 1
Data Source
AI summary
The present invention relates to a modified conjugated diene-based polymer, and more particularly, provides a modified conjugated diene-based polymer including a functional group derived from a modifier including a compound represented by Formula 1, and a method for preparing the same.