Modified Diene Polymer Silane Coupling Filler Dispersion
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Solution Overview
Problem
Existing methods for modifying conjugated diene-based polymers to improve filler dispersion and physical properties in rubber compositions, such as abrasion resistance and processability, are insufficient due to weak catalyst activity and low modification rates, particularly when using lanthanide series rare earth element compounds.
Innovation Solution
A method for preparing a modified conjugated diene-based polymer using a cyclized tertiary amine derivative as a modifier, which enhances filler affinity and prevents agglomeration, thereby improving mixing properties and mechanical properties of the rubber composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a modified conjugated diene-based polymer modified by conventional methods (tin-based compound, amino group introduction, alkoxysilane derivative) is used, then low exothermic properties are secured, but effects of improving physical properties such as abrasion resistance and processability are insufficient
Solution Approach 1:
The patent uses a silane coupling agent as an intermediary substance that modifies the conjugated diene-based polymer to create a bridge between the organic polymer and inorganic filler. The silane group reacts with the polymer while the alkoxy group interacts with the inorganic filler surface, achieving simultaneous improvement in both exothermic properties and physical properties through this mediating compound
Solution Approach 2:
The patent changes the chemical parameters of the polymer by introducing specific functional groups (silane and alkoxy groups) through modification. This chemical parameter change enables the polymer to interact effectively with inorganic fillers, resolving the contradiction between maintaining low exothermic properties and improving physical properties
2Reliability
If a living polymer obtained via coordination polymerization using a lanthanide series rare earth element compound catalyst is modified, then modification is achieved, but the activity of the living terminal is weak, modification rate is low, and effects of improving physical properties are insignificant
Solution Approach 1:
The patent changes the catalyst system parameters by selecting specific lanthanide compounds with higher activity and optimizing polymerization conditions. This parameter change increases the living terminal activity and modification rate while maintaining the ability to improve physical properties of the rubber composition
Solution Approach 2:
The patent introduces a silane coupling agent as an intermediary that facilitates efficient modification of the living polymer. This intermediary compound enables rapid reaction with the living terminal while simultaneously providing the functional groups needed for improved physical properties, thus resolving both the low modification rate and insufficient physical property improvement
3Loss of energy
If inorganic filler such as silica and carbon black is used in rubber composition to decrease exothermic properties, then fuel consumption ratio may be decreased, but dispersion of the inorganic filler in the rubber composition is not easy and defects of degrading physical properties are generated
Solution Approach 1:
The patent uses a silane-modified conjugated diene-based polymer as an intermediary that bridges the organic rubber matrix and inorganic filler. The silane groups on the polymer interact with the inorganic filler surface while the polymer chain maintains compatibility with the rubber matrix, achieving uniform dispersion and preventing aggregation that would degrade physical properties
Solution Approach 2:
The patent creates a composite material system where the silane-modified polymer acts as a coupling phase between the organic rubber and inorganic filler. This composite structure ensures compatible interaction between dissimilar materials, achieving both the energy-saving benefit of inorganic filler and the physical property requirements
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 achieves improved dispersibility of fillers, enhanced mechanical properties like abrasion resistance and processability, and a balanced physical property profile, including tensile strength and viscoelasticity, through optimized molecular weight distribution and mooney viscosity.
Implementation Method 1
a method for modifying a polymerization active part of a conjugated diene-based polymer which is obtained by anionic polymerization using an organolithium with a functional group which is capable of interacting with an inorganic filler
Implementation Method 2
dispersion of the inorganic filler in the rubber composition was not easy and defects of degrading the physical properties of the rubber composition such as abrasion resistance, cracking resistance and processability were rather generated
Data Source
AI summary
The present invention provides a modifier, a modified and conjugated diene-based polymer which is modified using the same, and a rubber composition including the modified and conjugated diene-based polymer, and more particularly, a modifier which includes a compound represented by Formula 1 and is capable of improving the mixing properties between a conjugated diene-based polymer and a filler, a modified and conjugated diene-based polymer which is modified using the same, and a rubber composition including the modified and conjugated diene-based polymer.