Fluoroalkylsilane Coating Composition Storage Stability
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Solution Overview
Problem
Existing easy-to-clean coatings based on fluoroorgano-functional silanes and siloxanes have short storage stability, low abrasion resistance, and lose their oleophobic effect quickly, with a need for improved weathering stability and durability.
Innovation Solution
A coating composition comprising hydrolyzable fluoroalkylsilane, HCl, water, isopropanol, and a solvent or diluent, with a silane:water molar ratio of 1:4.5 to 1:9, undergoes controlled hydrolysis and condensation, providing a stable, abrasion-resistant, and weathering-stable easy-to-clean coating for inorganic surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing fluoroorgano-functional silane coating systems are used, then easy-clean properties are achieved, but storage stability is short and abrasion resistance is low
Solution Approach 1:
The patent changes the chemical composition parameters by introducing specific fluoroalkylsilane compounds with controlled hydrolyzable groups (chlorine, methoxy, ethoxy, isopropoxy, or n-propoxy) and adjusting the silane-to-water molar ratio to 1:4.5 to 1:9. This parameter optimization enables the coating to maintain storage stability of at least one year while achieving excellent abrasion resistance and weathering stability.
2Ease of operation
If fluoroalkylsilane coatings are applied, then oleophobic effect is provided, but the effect is lost after short time
Solution Approach 1:
The patent creates a composite coating system combining fluoroalkylsilane components with specific solvents (isopropanol and other solvents/diluents) and controlled water content. This composite formulation maintains the oleophobic and hydrophobic properties while significantly extending the duration of the easy-clean effect through optimized molecular structure and composition.
3Reliability
If weathering stability is improved, then outdoor application suitability increases, but formulation complexity increases
Solution Approach 1:
The patent applies local quality by selectively introducing fluoroalkyl groups with specific chain lengths (n=3-9) and terminal CF3 groups at targeted positions in the molecular structure. This localized modification of the silane molecule provides enhanced weathering stability and outdoor durability without requiring complex multi-component formulations or additional processing steps.
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 achieves outstanding storage stability, excellent abrasion resistance, and high weathering and chemical resistance, maintaining easy-clean properties for over a year, suitable for outdoor applications on smooth inorganic surfaces.
Implementation Method 1
a storage-stable, easy-to-clean coating composition based on components a) at least one hydrolyzable fluoroalkylsilane of the formula (I)... c) water... undergoes controlled hydrolysis and condensation
Implementation Method 2
a storage-stable, easy-to-clean coating composition based on components a) at least one hydrolyzable fluoroalkylsilane of the formula (I)... undergoes controlled hydrolysis and condensation
Data Source
AI summary
The present invention relates to a special coating composition based on components a) at least one hydrolysable fluoroalkylsilane of the formula (I) CF3(CF2)n(CH2)2Si(CH3)yX3-y, in which X is a group from the series chlorine, methoxy, ethoxy, isopropoxy, and n-propoxy and n is a number from the series 3, 4, 5, 6, 7, 8, and 9, and y is 0 or 1, b) HCl, c) water, d) isopropanol, and e) at least one further solvent and/or diluent from the series of the alcohols, glycols, glycol ethers, ethers, esters, ketones, and aliphatic and aromatic hydrocarbons, wherein the silane component (a):water molar ratio of 1:4.5 to 1:9. The invention further relates to a process for preparing such a composition and also to its use for providing smooth, inorganic substrate surfaces with an abrasion-resistant and weathering-stable easy-to-clean coating.