Silane-Modified Rubber Compound for Filler Affinity and Wet Grip
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Solution Overview
Problem
Existing rubber materials for tires, such as conjugated diene-based polymers, face challenges in achieving high affinity with fillers, which affects their performance in terms of wet skid resistance and steering stability.
Innovation Solution
A novel compound represented by Formula 1 is introduced, which modifies rubber by providing a high modification rate and increased affinity with fillers through a reaction with a compound represented by Formula 2 and Formula 3 under basic conditions, forming strong covalent bonds with the filler.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional rubber materials (natural rubber, polyisoprene rubber, polybutadiene rubber) are used to achieve low hysteresis loss, then low running resistance is improved, but wet skid resistance deteriorates due to low affinity with fillers
Solution Approach 1:
The invention changes the chemical structure parameters of the rubber compound by introducing a specific silane-modified polybutadiene component with controlled vinyl content (10-40%) and silane grafting degree. This parameter modification enables the rubber to achieve both low hysteresis loss and high filler affinity, simultaneously improving running resistance and wet skid resistance
Solution Approach 2:
The invention creates a composite rubber compound by combining silane-modified polybutadiene with conventional fillers (silica, carbon black) and other rubber components. The silane-modified polybutadiene acts as a bridge between the rubber matrix and fillers, forming a composite structure that enhances filler affinity while maintaining low hysteresis loss characteristics
2Reliability
If solution polymerized SBR is used to control vinyl structure content and styrene content, then rubber properties and molecular weight are improved, but the complexity of polymerization process increases
Solution Approach 1:
The invention performs preliminary modification of polybutadiene by grafting silane groups before the main polymerization process. This preliminary action creates a pre-modified polymer that can be directly used in subsequent compounding and vulcanization, eliminating the need for complex in-situ modification steps and simplifying the overall process while achieving desired rubber properties
3Strength
If chain terminal modification is performed to reduce chain terminal movement, then bonding strength with fillers is improved, but the number of processing steps increases
Solution Approach 1:
The invention merges the chain terminal modification step with the filler mixing and vulcanization process. The silane-modified polybutadiene is directly compounded with fillers and other ingredients, and the silane groups react with fillers during vulcanization. This merging of steps achieves strong filler bonding without requiring separate modification operations, reducing processing complexity while maintaining high bonding strength
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 rubber exhibits enhanced affinity with fillers, resulting in improved wet skid resistance and steering stability, with a high modification rate and strong bond formation.
Implementation Method 1
forming strong covalent bonds with the filler
Data Source
AI summary
The present invention provides a novel compound which is a modifier material useful for modifying rubber, specifically, a polymer including a repeating unit derived from a conjugated diene-based monomer, and a method for preparing the same.