Fluorinated Surfactant with Cationic Group for Solubility and Surface Activity
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Solution Overview
Problem
Existing fluorine-containing surfactants lack improved properties and are not easily accessible synthetically, with concerns regarding degradability and environmental compatibility.
Innovation Solution
A composition comprising a fluorine-containing surfactant with a cationic group, a divalent or polyvalent sulfur-containing group, and a fluorinated group, along with an anion corresponding to the cationic group, featuring an N,N-disubstituted imidazolium, benzimidazolium, or benzimidazolinium group, which allows for cost-effective production and modification of surfactant properties, enhancing hydrophobic and oleophobic effects and solubility in polar solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional fluorine-containing surfactants are used, then surfactant properties are achieved, but production cost is high and synthetic accessibility is limited
Solution Approach 1:
The patent changes the chemical structure parameters of the surfactant by introducing a cationic group (quaternary ammonium, phosphonium, or sulfonium) combined with a fluorinated alkyl group. This structural parameter change enables the surfactant to be synthesized from readily available precursors through straightforward quaternization reactions, significantly improving synthetic accessibility and reducing production costs while maintaining effective surfactant properties
Solution Approach 2:
The patent creates a composite surfactant structure by combining two functional components: a cationic group (for solubility and substrate interaction) and a fluorinated alkyl group (for hydrophobic/oleophobic effects). This composite structure integrates the benefits of both components, achieving cost-effective production through simple synthesis while maintaining superior surfactant performance
2Reliability
If fluorinated group chain length is increased to enhance hydrophobic and oleophobic effects, then surface activity is improved, but environmental friendliness deteriorates
Solution Approach 1:
The patent optimizes the fluorinated alkyl group chain length to a specific range (C3-C9, preferably C4-C6) to achieve the desired balance. This parameter optimization ensures sufficient hydrophobic and oleophobic effects for effective surface activity while keeping the molecular size limited, thereby improving degradability and reducing environmental persistence compared to longer-chain fluorinated surfactants
3Reliability
If cationic group is introduced to improve solubility in polar solvents and substrate interaction, then surface activity is enhanced, but molecular complexity increases
Solution Approach 1:
The patent introduces a cationic group (quaternary ammonium, phosphonium, or sulfonium) as a simple structural modification to the base molecule. This parameter change dramatically improves solubility in polar solvents and enhances interaction with negatively charged substrates through electrostatic attraction, while the modular nature of the cationic group keeps the overall molecular structure relatively simple and easy to synthesize
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 composition exhibits improved solubility, surface activity, and environmental friendliness, with enhanced hydrophobic and oleophobic properties, and can be used in various applications such as surface coatings, foaming agents, and polymerization processes.
Implementation Method 1
The fluorinated group has a hydrophobic and oleophobic (amphiphobic) effect
Implementation Method 2
The fluorinated group has a hydrophobic and oleophobic (amphiphobic) effect
Implementation Method 3
The cationic group allows the fluorosurfactants to be dissolved in solvents with higher polarity and increases the interaction with substrates that have at least a negative partial charge
Implementation Method 4
the cationic charge of the fluorosurfactants can also introduce specific anions, which in turn have an effect on the surface activity of the composition
Data Source
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AI summary
The invention relates to a composition comprising a fluorine-containing surfactant having a cationic group, a divalent sulfur-containing group and a fluorinated group, further comprising an anion that corresponds to the cationic group of the fluorine-containing surfactant, the cationic group being an N-alkylated heterocyclic group.