Modified Conjugated Diene Polymer Silica Carbon Black Affinity
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Solution Overview
Problem
Conjugated diene-based polymers for tires face limitations in achieving high affinity with both silica and carbon black fillers, leading to inadequate wet skid resistance and limited application range, with existing modifiers showing insufficient effectiveness in improving filler dispersibility and modifying ratios.
Innovation Solution
A compound represented by Formula 1, which includes a functional group with high anionic reactivity and affinity for silica and carbon black, is used to modify conjugated diene-based polymers, enhancing their interaction with fillers and solubility, thereby improving physical properties and modification ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silica is used as reinforcing filler to improve wet skid resistance and reduce hysteresis loss, then wet skid resistance is improved, but dispersibility deteriorates due to low affinity between hydrophilic silica surface and hydrophobic rubber
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance that chemically bonds to both the silica surface (through silanol groups) and the rubber polymer (through organofunctional groups). This mediator resolves the affinity mismatch between hydrophilic silica and hydrophobic rubber, enabling improved wet skid resistance while maintaining good dispersibility.
Solution Approach 2:
The patent modifies the surface properties of silica by controlling the hydrolysis and condensation of silane coupling agents under specific conditions (temperature, moisture content, catalyst). By changing these parameters, the coupling agent forms a gradient structure that transitions from hydrophilic near silica to hydrophobic toward rubber, optimizing both dispersibility and wet skid resistance.
2Stability of the object's composition
If a silane coupling agent is used to improve dispersibility and coupling between silica and rubber, then dispersibility is improved, but the affinity with carbon black is relatively degraded, limiting application range
Solution Approach 1:
The patent designs a multi-functional silane coupling agent containing both alkoxy groups (for silica coupling) and organofunctional groups (for rubber coupling). This universal coupling agent can simultaneously or alternatively bond with different fillers (silica, carbon black, etc.), enabling the same polymer composition to be applied to various filler systems without degrading performance, thus expanding application range.
3Reliability
If existing modifiers are used to introduce functional groups at polymer terminals to improve affinity with silica, then affinity with silica is improved, but modification ratio remains insufficient
Solution Approach 1:
The patent optimizes the modification process by controlling key parameters including silane coupling agent concentration (0.1-5 parts by weight), reaction temperature (60-120°C), moisture content (1-20%), and catalyst amount (0.01-1 part by weight). These parameter optimizations enable high modification ratios (80-95%) while maintaining strong silica affinity, resolving the insufficient modification issue of existing approaches.
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 polymers exhibit improved affinity with both silica and carbon black, leading to enhanced dispersibility, abrasion resistance, and processability, along with increased modification ratios, effectively addressing the limitations of existing polymers.
Implementation Method 1
A compound represented by Formula 1, which includes a functional group with high anionic reactivity and affinity for silica and carbon black, is used to modify conjugated diene-based polymers
Implementation Method 2
enhancing their interaction with fillers and solubility, thereby improving physical properties and modification ratios
Data Source
AI summary
The present invention provides a compound represented by Formula 1, a modified and conjugated diene-based polymer with a high modification ratio, which includes a functional group derived from the compound, a method for preparing the polymer, a rubber composition including the polymer, and a tire manufactured from the rubber composition.