Elastomer Masterbatch via Zeta Potential Electrostatic Coagulation
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Solution Overview
Problem
Existing methods for preparing masterbatches of synthetic diene elastomers and carbon fillers face challenges in achieving uniform dispersion and high coagulation yields without using coagulation agents, particularly for synthetic elastomers where carbon black coagulation is spontaneous, requiring complex equipment and precise conditions.
Innovation Solution
A method involving the preparation of an aqueous dispersion of carbonaceous filler with a Zeta potential opposite to that of anionic or cationic synthetic elastomer latex, ensuring a difference in potentials greater than or equal to 20mV, allowing for mixing and coagulation without coagulation agents, followed by drying to obtain the masterbatch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hydraulic shocks or violent mechanical agitation are used to disperse carbon black, then dispersion uniformity is improved, but equipment complexity and energy consumption increase
Solution Approach 1:
The patent replaces violent mechanical agitation and hydraulic shocks with an electrostatic field-based coagulation mechanism. By controlling the Zeta potential difference between carbon black and elastomer latex, coagulation occurs through electrostatic attraction rather than mechanical force, eliminating the need for complex high-shear mixing equipment while achieving uniform dispersion.
Solution Approach 2:
The patent changes the fundamental parameter from mechanical energy input to electrostatic potential difference control. By adjusting the Zeta potential of carbon black dispersion to have the opposite sign to elastomer latex with a difference of at least 20mV, the system achieves coagulation through electrostatic parameters rather than mechanical intensity parameters.
2Productivity
If coagulation agents are added to achieve coagulation with synthetic elastomers, then coagulation yield is improved, but product purity and process simplicity worsen
Solution Approach 1:
The patent enables the system to coagulate itself by exploiting the inherent electrostatic properties of the materials. The carbon black dispersion and elastomer latex automatically coagulate when their Zeta potentials have opposite signs with sufficient difference, eliminating the need for external coagulation agents and the associated purification steps.
Solution Approach 2:
The patent converts the typically problematic need for coagulation agents into a beneficial self-coagulation process. By utilizing the natural electrostatic charge differences between carbon black and synthetic elastomer, the system turns what would require chemical intervention into an intrinsic physical phenomenon, improving both yield and purity.
3Manufacturing precision
If complex equipment with precise geometry and flow speed control is used, then dispersibility is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The patent replaces complex mechanical systems requiring precise geometry and flow speed control with a simple electrostatic field-based process. The coagulation and dispersion uniformity are controlled by the Zeta potential difference parameter rather than mechanical flow parameters, dramatically simplifying equipment and operation.
Solution Approach 2:
The patent shifts from controlling multiple mechanical parameters (geometry, flow speed, agitation intensity) to controlling a single electrostatic parameter (Zeta potential difference). This parameter change simplifies both equipment design and operational control while maintaining high dispersion uniformity.
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 achieves a coagulation yield greater than 80% with minimal deviation in loading rate, simplifying the process and eliminating the need for complex equipment, making it suitable for synthetic elastomers.
Implementation Method 1
prepare an aqueous dispersion of carbonaceous filler having a Zeta potential of sign opposite to that of an anionic or cationic synthetic elastomer latex, the difference in the potentials of the anionic or cationic elastomer latex and the aqueous dispersion of carbonaceous filler being such that its absolute value is greater than or equal to 20mV
Data Source
AI summary
The invention relates to a method for producing a masterbatch of synthetic elastomer and carbonated filler, comprising the following steps: producing an aqueous dispersion of carbonated filler having a zeta potential of the opposite sign to that of an anionic or cationic synthetic elastomer latex, the difference between the potentials of the anionic or cationic elastomer latex and the aqueous dispersion of carbonated filler being such that the absolute value thereof is higher than, or equal to, 20mV; bringing into contact and mixing the anionic or cationic synthetic elastomer latex and the aqueous dispersion of carbonated filler in order to produce a coagulum; recovering the coagulum; and drying the recovered coagulum in order to produce the masterbatch.