Fluorosilane-Aminosilane Condensation for Stable Protective Coatings
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Solution Overview
Problem
Existing fluorinated silane compositions for building protection face challenges such as instability in high dielectric solvent systems and the release of perfluoro-octanoic acid (PFOA), which is toxic and bioaccumulates, leading to cancer concerns.
Innovation Solution
A non-aqueous reactive composition comprising a fluorosilane and an aminosilane with specific structural features, combined in a solvent system with a high dielectric constant, forming a stable and non-toxic surface protective agent that avoids PFOA release and achieves excellent water- and oil-repellence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorinated silanes are used to achieve water- and oil-repellence, then protective performance is improved, but stability in high dielectric solvent systems deteriorates
Solution Approach 1:
The patent changes the chemical structure parameters of the fluorinated silane by introducing specific molecular architectures (Formula I and II with defined Rf groups and chain lengths) that modify the dielectric interaction properties, enabling stability in high dielectric constant solvents while maintaining water- and oil-repellent performance
Solution Approach 2:
The patent creates a composite system by combining fluorinated silane with specific co-solvents and additives that form a synergistic mixture, where the composite composition achieves both stability in high dielectric solvents and effective protective performance on substrates
2Reliability
If long-chain perfluorinated silanes are used to enhance water- and oil-repellence, then protective performance is improved, but toxicity and bioaccumulation worsen due to PFOA release
Solution Approach 1:
The patent extracts and removes the problematic PFOA moiety from the molecular structure by using alternative fluorinated silane structures that do not contain the perfluoro-octanoic acid chain, thereby eliminating the source of bioaccumulation and toxicity while preserving the water- and oil-repellent functionality
Solution Approach 2:
The patent converts the harmful long perfluorinated chain into a beneficial short-chain or cyclic fluorinated structure that provides equivalent or superior protective performance without the toxic side effects, turning a harmful chemical feature into a safe and effective one
3Stability of the object's composition
If aqueous compositions with high water content are used to improve stability, then shelf stability is improved, but water- and oil-repellence performance deteriorates
Solution Approach 1:
The patent changes the solvent composition parameters by using non-aqueous or low-water-content systems with carefully selected co-solvents that maintain molecular mobility and reaction activity without diluting the fluorinated silane's hydrophobic and oleophobic properties, thereby achieving both stability and performance
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 provides a stable and non-toxic surface protective agent with enhanced shelf-life and hydrophobicity, effectively repelling water and oil without releasing PFOA, suitable for use on various substrates like stone and wood, with improved stability and safety compared to aqueous systems.
Implementation Method 1
a condensation product of said fluorosilane and said aminosilane
Implementation Method 2
simultaneous water-repellence and oil-repellence
Implementation Method 3
simultaneous water-repellence and oil-repellence
Data Source
AI summary
The present invention relates to a composition comprising at least one fluorosilane and at least one aminosilane, a condensation product of said fluorosilane and said aminosilane, and a surface protective agent made thereof.