Perfluoropolyether Surface-Treating Agent for UV-Resistant Coatings
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Solution Overview
Problem
The existing surface-treating layers formed using fluorine-containing silane compounds lack durability, particularly when exposed to ultraviolet rays, leading to insufficient performance over time.
Innovation Solution
A surface-treating agent comprising a perfluoro(poly)ether group-containing silane compound and a perfluoro(poly)ether group-containing compound, which forms a layer with enhanced friction durability and UV resistance, utilizing specific molecular structures and ratios to maintain physical properties after UV irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluorine-containing silane compound is used for surface treatment, then water-repellency and oil-repellency are improved, but durability under UV exposure deteriorates
Solution Approach 1:
The patent combines a fluorine-containing silane compound (formula 1) with a perfluoropolyether compound (formula 2) to create a composite surface treatment system. The silane compound provides covalent bonding to the substrate and water-repellency, while the perfluoropolyether compound adds UV resistance and oil-repellency, achieving synergistic durability enhancement that neither component could provide alone.
Solution Approach 2:
The patent optimizes specific parameters including the molecular structure of the silane compound (with Rf2 being fluorinated alkyl groups), the perfluoropolyether chain length (a+b+c+d+e+f≥1), and the mass ratio between components (0.01-10 parts per 100 parts silane compound). These parameter adjustments maximize both UV resistance and water-repellency while ensuring durability.
2Reliability
If a surface-treating layer is formed to provide water-repellency, then hydrophobicity is improved, but friction durability deteriorates
Solution Approach 1:
The patent creates a composite system where the fluorine-containing silane compound (providing strong substrate bonding through hydrolyzable groups) combines with the perfluoropolyether compound (providing low-friction surface properties). This composite approach achieves both high water-repellency and improved friction durability by leveraging the complementary strengths of each material.
Solution Approach 2:
The patent applies different functional groups at different locations: the silane compound's hydrolyzable groups (R23) bond covalently to the substrate for anchoring strength, while the perfluorinated groups (Rf2 and PFPE) orient toward the surface to provide water-repellency and low friction. This spatial differentiation of functions resolves the contradiction between adhesion and surface properties.
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 proposed surface-treating agent effectively forms a layer with improved UV resistance and friction durability, maintaining physical properties such as contact angle and friction durability before and after UV exposure.
Implementation Method 1
a layer having high light stability, particularly high ultraviolet resistance can be formed
Implementation Method 2
a perfluoropolyether group-containing silane compound having a perfluoropolyether group in the molecular backbone and a hydrolyzable group that binds to an Si atom at its molecular terminal or terminal portion
Data Source
AI summary
A surface-treating agent including a perfluoro(poly)ether group-containing silane compound and a perfluoro(poly)ether group-containing compound. The perfluoro(poly)ether group-containing compound contains a radical capturing group or a UV absorbing group in the molecule.