Peroxidic Fluoropolyether Carboxylate Microemulsion for Stable Polymerization
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Solution Overview
Problem
Conventional surfactants like perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) in microemulsions result in large particle sizes and instability during polymerization reactions, leading to unsafe explosive polymerization, especially in tetrafluoroethylene polymerization processes.
Innovation Solution
A microemulsion using peroxidic fluoropolyether carboxylate as an emulsifier, with a specific molecular structure and weight ratio of water to oil, is developed, allowing for the formation of stable microemulsions with smaller particle sizes and improved stability, suitable for polymerization reactions such as dispersion and emulsion polymerization of fluoropolymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional surfactants (PFOS, PFOA, fluoropolyether) are used in microemulsion, then the microemulsion can be formed, but the particle size becomes large (150-300 nm) and the microemulsion becomes unstable during polymerization
Solution Approach 1:
The patent changes the chemical structure parameters of the surfactant by introducing peroxidic groups and specific fluoropolyether chains with controlled molecular weight (300-5000), which fundamentally alters the micelle formation and stabilizes the microemulsion at smaller particle sizes (30-150 nm) during polymerization
Solution Approach 2:
The patent uses a composite surfactant system combining peroxidic groups with fluoropolyether chains, creating a synergistic effect that provides both steric stabilization and controlled micelle formation, resulting in stable microemulsions with uniform small particles suitable for polymerization
2Ease of manufacture
If conventional surfactants are used, then microemulsion can be formed, but violent stirring destroys the micelles and causes unsafe explosive polymerization
Solution Approach 1:
The peroxidic fluoropolyether carboxylate surfactant provides beforehand cushioning by forming a protective interface that prevents violent stirring from destroying micelles, thereby preventing unsafe explosive polymerization before it can occur
Solution Approach 2:
The patent employs a surfactant with specific peroxidic and ether linkages that can be easily decomposed or replaced, providing a safe alternative that prevents explosive polymerization without requiring complex stabilization mechanisms
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 microemulsion achieves particle sizes of 30-150 nm, enhancing the stability and purity of polytetrafluoroethylene and fluoro-rubber products, reducing viscosity, and improving processing properties like film-forming and moulding operations.
Implementation Method 1
a microemulsion using peroxidic fluoropolyether carboxylate as emulsifier... the formation of a microemulsion mainly depends on the matching of each component in the system. The factors determining the stability of a microemulsion mainly are the kinds of the surfactants
Data Source
AI summary
A microemulsion consisting of water, peroxidic fluoropolyether carboxylate and oil is provided. When the microemulsion is used in homopolymerization, binary copolymerization or multi-component copolymerization of fluorine-containing olefin monomers, an emulsion with a low viscosity and a particle diameter of 30-200 nm can be obtained.