Ionic Liquid Catalyzed Silylation for Silica Rubber Composites
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Solution Overview
Problem
Current methods for silylation reactions in tread rubber manufacturing are inefficient, requiring high amounts of sulfur-containing silane, leading to increased costs and poor controllability of the interfacial structure, which affects the performance and dynamic properties of high-performance tires.
Innovation Solution
The use of ionic liquids to catalyze the silylation reaction in situ, activating silanol groups on silica fillers and enhancing the condensation between siloxane and silanol groups, thereby reducing the amount of silane needed and improving the interfacial interaction and dispersion of fillers in the rubber composite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high amount of sulfur-containing silane is used for silylation treatment, then the interfacial property between silica and rubber is improved, but the manufacturing cost increases and the controllability of interfacial structure deteriorates
Solution Approach 1:
The patent introduces ionic liquid as a catalyst to mediate the silylation reaction between silane and silica. The ionic liquid facilitates the reaction process, enabling effective silylation treatment with reduced silane dosage. This intermediary substance resolves the contradiction by improving interfacial properties while minimizing the quantity of silane required.
Solution Approach 2:
The patent changes the reaction conditions by introducing ionic liquid catalyst, which alters the reaction mechanism and kinetics. This parameter change enables the silylation reaction to proceed efficiently with lower silane content, thus improving interfacial properties without requiring high amounts of silane.
2Reliability
If a high amount of sulfur-containing silane is used for silylation treatment, then the interfacial property between silica and rubber is improved, but the manufacturing cost increases
Solution Approach 1:
The ionic liquid acts as a catalyst that enables the silylation reaction to proceed efficiently with reduced silane dosage. This intermediary substance resolves the contradiction by improving interfacial properties while minimizing the quantity of silane required, thereby reducing manufacturing costs.
Solution Approach 2:
The patent employs ionic liquid as a catalytic agent that can be used in small amounts to achieve effective silylation. This approach replaces the need for large quantities of expensive silane, making the manufacturing process more cost-effective while maintaining product quality.
3Device complexity
If the silylation reaction is performed without catalyst, then the reaction process is simple, but the silylation efficiency is very low
Solution Approach 1:
The ionic liquid serves as a catalyst that mediates the silylation reaction, significantly improving reaction efficiency. This intermediary substance enables the reaction to proceed rapidly and completely, resolving the contradiction between process simplicity and reaction efficiency.
Solution Approach 2:
The patent introduces a catalytic agent that changes the reaction kinetics and mechanism. This parameter change transforms the slow, inefficient uncatalyzed reaction into a fast, efficient catalyzed process, thereby improving silylation efficiency while maintaining relative process simplicity.
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
This method significantly enhances the dynamic mechanical performance of tread rubber, reduces rolling resistance, and improves modulus, while minimizing the use of silane, making it more cost-effective and efficient for high-performance tire production.
Implementation Method 1
the silylation reaction between the siloxane and the filler can be significantly catalyzed by the ionic liquids
Implementation Method 2
Onium ions of the ionic liquid which are adsorbed to the surface of silica can activate the silanol groups through a charge effect, i.e. generating silanolate anions
Implementation Method 3
Owing to an interaction between polar groups of the ionic liquid and surface hydroxyl groups of silica (such as hydrogen-bond interaction), the cations of the ionic liquid can be adsorbed to the surface of silica
Implementation Method 4
condensation reactions between alkoxy groups and surface hydroxyl groups (such as silanol groups) of the filler
Data Source
AI summary
The present invention discloses a method for preparing high-performance tread rubber through a filler silylation reaction catalyzed in situ by an ionic liquid. The method is as follow: adding a gum rubber, a filler, a silane and an ionic liquid successively into an open mill or an internal mixer for mixing to obtain a rubber compound; high-temperature remilling the rubber compound; adding a vulcanizing package and an anti-aging agent into the remilled rubber compound at room temperature; and vulcanizing the rubber compound to obtain a vulcanized rubber. The method uses the ionic liquid as a catalyst for the silylation of filler surfaces, which effectively promotes the dispersion of a light-colored filler such as silica in the rubber, and improves the rubber-filler interfacial performance. Therefore, this method can substantially reduce an amount of the silane and improve dynamic mechanical performance of a tread rubber material, including reduced rolling resistance and heat build-up. This method has advantages such as simple technology and no additional processing equipment or step is needed, having an important prospect in preparation of the high-performance tire.