Fluoropolymer Aqueous Polymerization Non-Fluorinated Emulsifier
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Solution Overview
Problem
Existing methods for producing fluoropolymers rely on expensive and environmentally harmful fluorinated surfactants, which are difficult to completely remove, leading to stability and contamination issues in polymerization processes.
Innovation Solution
The use of non-fluorinated, non-ionic emulsifiers containing blocks of polyethylene glycol, polypropylene glycol, and/or polytetramethylene glycol to polymerize fluoromonomers in an aqueous medium without fluorinated surfactants, resulting in stable and clean fluoropolymer dispersions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorinated surfactants are used to stabilize fluoropolymer emulsion, then stable particle and high molecular weight are achieved, but high cost and environmental harm are incurred
Solution Approach 1:
The patent replaces expensive, persistent fluorinated surfactants with cheaper, biodegradable non-fluorinated surfactants. The non-ionic surfactants (such as alkyl phenol ethoxylates, alkyl amine ethoxylates, and fatty acid ethoxylates) are less persistent in the environment and can be more easily degraded, thus reducing environmental harm while maintaining emulsion stability functionality
Solution Approach 2:
The patent changes the chemical composition parameters of the surfactant from fluorinated to non-fluorinated types. By selecting surfactants with specific HLB values (10-18) and using non-ionic character, the patent achieves emulsion stability without the environmental persistence associated with fluorinated compounds
2Reliability
If fluorinated surfactants are used to achieve stable dispersion, then high molecular weight fluoropolymer is produced, but difficulty in complete removal leads to contamination issues
Solution Approach 1:
The patent employs non-fluorinated surfactants that are more easily removed or degraded compared to fluorinated surfactants. The selected surfactants (alkyl phenol ethoxylates, alkyl amine ethoxylates, fatty acid ethoxylates) can be more completely removed during washing processes, reducing contamination in the final polymer product
Solution Approach 2:
The patent facilitates the extraction and removal of surfactant residues from the polymer product. By using non-fluorinated surfactants with specific chemical properties (non-ionic character, specific HLB ranges), the surfactants can be more effectively separated from the polymer during post-processing, achieving lower contamination levels
3Productivity
If conventional emulsifiers are used, then polymerization proceeds, but discoloration occurs at elevated temperatures
Solution Approach 1:
The patent uses non-fluorinated surfactants that do not contain chromophoric groups prone to thermal degradation and discoloration. The selected surfactants (alkyl phenol ethoxylates, alkyl amine ethoxylates, fatty acid ethoxylates) are thermally more stable and less prone to causing polymer discoloration at elevated processing temperatures compared to conventional surfactants
Solution Approach 2:
The patent changes the thermal stability parameters of the surfactant system by selecting compounds with higher thermal decomposition temperatures and lower tendency to cause polymer yellowing. The non-ionic surfactants with specific molecular structures provide better thermal stability during polymerization and processing
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 approach produces thermally stable, light-colored fluoropolymers with improved latex stability and shelf-life, free from fluorinated surfactants, reducing environmental concerns and contamination, while maintaining high molecular weight and purity.
Implementation Method 1
non-fluorinated non-ionic emulsifier
Implementation Method 2
aqueous dispersion process, which provides a suitable heat sink for controlling the heat of polymerization
Implementation Method 3
free radical initiators
Data Source
AI summary
A novel aqueous polymerization process for making fluoropolymer dispersions is disclosed in which non-ionic non-fluorinated emulsifier is used to produce fluoropolymer emulsions. The emulsifiers contain blocks of polyethylene glycol, polypropylene glycol and/or polytetramethylene glycol. The process and fluoropolymer produced contain no fluorinated surfactant. The fluoropolymers have excellent resistance to discoloration.