Ultrasonic Silica Surface Modification for Stable Rubber Masterbatch
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Solution Overview
Problem
Silica is hydrophilic and does not easily disperse in hydrocarbon solvents, making it challenging to produce stable solutions of silica in hydrocarbon solvents for applications such as surface-modified silica and silica-rubber masterbatches.
Innovation Solution
The use of an ultrasonic vibration system to promote a silanization reaction between silica and a silane in a hydrocarbon solvent, resulting in a stable solution that can be directly dried to produce surface-modified silica or mixed with a polymer cement to generate a silica/polymer masterbatch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional mixing methods are used to disperse silica in hydrocarbon solvents, then the mixing process is simple, but silica does not disperse and stable solutions cannot be obtained
Solution Approach 1:
The patent applies ultrasonic vibration to promote the silanization reaction between silica and silane in hydrocarbon solvent. The ultrasonic energy facilitates the chemical reaction and enables stable dispersion of silica in the hydrocarbon medium, resolving the contradiction between solution stability and process simplicity.
Solution Approach 2:
The patent changes the chemical parameters by introducing silane as a modifying agent and controlling the silanization reaction conditions (ultrasonic treatment, temperature, time). This chemical modification transforms the hydrophilic silica surface to be compatible with hydrocarbon solvents, achieving stable solutions without complex multi-step processes.
2Stability of the object's composition
If ultrasonic vibration is used to promote silanization reaction, then stable silica solutions are obtained, but the process requires additional equipment and time
Solution Approach 1:
Ultrasonic vibration is applied to promote the silanization reaction between silica and silane in hydrocarbon solvent, enabling stable dispersion and chemical modification. The ultrasonic energy facilitates both the chemical reaction and the uniform distribution of modified silica in the solvent.
Solution Approach 2:
Silane acts as an intermediary substance that bridges the hydrophilic silica and hydrophobic hydrocarbon solvent. The silane forms a chemical bond with silica surface and provides hydrocarbon-compatible groups, enabling stable dispersion without requiring complex stabilization systems.
3Reliability
If ultrasonic mixing is performed for extended periods, then more complete silanization reaction occurs, but production time increases
Solution Approach 1:
Ultrasonic vibration provides intense energy input that accelerates the silanization reaction kinetics. The cavitation and mechanical effects of ultrasonic treatment create favorable conditions for rapid and complete reaction, reducing the required processing time while ensuring high reaction completeness.
Solution Approach 2:
The ultrasonic treatment can be applied in periodic cycles rather than continuous operation, allowing the reaction to proceed in intervals. This periodic ultrasonic activation maintains high reaction efficiency while reducing total processing time and energy consumption.
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 enables the production of stable silica solutions in hydrocarbon solvents, allowing for the creation of surface-modified silica and silica-rubber masterbatches, which can be effectively incorporated into various rubber compositions, including tires.
Implementation Method 1
The use of an ultrasonic vibration system to promote a silanization reaction between silica and a silane in a hydrocarbon solvent
Implementation Method 2
Ultrasonic mixing may be performed for a time period of from 1 to 40 minutes (e.g., from 10 to 40 minutes) and/or at room temperature
Data Source
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AI summary
A process for preparing a masterbatch is disclosed. The process comprises (i) ultrasonically mixing silica and a silane in a hydrocarbon solvent to form a solution, and mixing the solution and a polymer cement to form a mixture; or (ii) mixing a solution comprising a surface-modified silane in a hydrocarbon solvent with a polymer cement to form a mixture. The process further comprises drying the mixture to form the masterbatch.