Perfluoropolyether Silane Surface Treating Agent for Friction Durability
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Solution Overview
Problem
Conventional surface-treating agents containing fluoro-containing silane compounds lack sufficient friction durability for applications requiring long-term functionality, especially in optical members and touch panels that need to maintain light permeability and transparency.
Innovation Solution
A surface-treating agent comprising a perfluoro(poly)ether group containing silane compound with 80 mol% or more of the repeating units of polyethylene chains having a Si atom in its side chain, specifically formulated to enhance friction durability while maintaining water-repellency, oil-repellency, and antifouling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional surface-treating agent containing fluoro-containing silane compound is used, then water-repellency and oil-repellency are achieved, but friction durability is insufficient
Solution Approach 1:
The invention changes the molecular structure parameters of the silane compound by specifying that g (number of repeating units of polyethylene chain having Si atom) must be 2 or more, and this structure must constitute 80 mol% or more of the total. This parameter change in molecular architecture directly improves friction durability while maintaining the duration of action
Solution Approach 2:
The invention creates a composite molecular structure combining perfluoropolyether main chain with multiple polyethylene chains containing Si atoms. This composite structure at the molecular level provides both the water/oil repellency (from fluorine) and enhanced friction durability (from multiple Si-containing chains), resolving the contradiction between initial performance and long-term durability
2Illumination intensity
If the surface-treating layer is made thin to maintain light permeability, then transparency is improved, but friction durability decreases
Solution Approach 1:
The invention changes the molecular structure parameters to achieve higher functionality per unit thickness. By specifying g≥2 and the 80 mol% composition requirement, the compound provides enhanced friction durability in a thinner film, thus maintaining light permeability while improving reliability
Solution Approach 2:
The invention concentrates the friction-resistant functionality in specific molecular regions (the polyethylene chains with Si atoms at g≥2) that constitute 80 mol% or more of the structure. This localized quality enhancement allows thin films to achieve high friction durability without compromising light permeability
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 novel surface-treating agent forms a layer with improved friction durability, water-repellency, oil-repellency, and antifouling properties, suitable for use in optical members and touch panels, ensuring long-term functionality and resistance to fouling and water infiltration.
Implementation Method 1
a perfluoro(poly)ether group containing silane compound comprising a main molecular chain having a perfluoropolyether group and a polyethylene chain having a Si atom having a hydroxyl group or a hydrolyzable group in its side chain
Implementation Method 2
The layer formed from the surface-treating agent containing the fluoro-containing silane compound
Implementation Method 3
A certain fluorine-containing silane compound is known to be able to provide excellent water-repellency, oil-repellency, antifouling property
Data Source
AI summary
The present invention provides a surface-treating agent comprising at least one perfluoro(poly)ether group containing silane compound of the formula (1): wherein the symbols have the same definition as set forth in description.