Perfluoropolyether Silane Coating for Friction Durability
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Solution Overview
Problem
Conventional surface-treating agents containing fluorine-containing silane compounds fail to provide sufficient friction durability for optical members and touch panels, which require long-term functionality and light permeability.
Innovation Solution
A surface-treating agent comprising a perfluoro(poly)ether group containing silane compound with a high number of repeating units of polyethylene chains attached to a Si atom in its side chain, specifically ≥ 2, and ≥80 mol% of the compound, forming a layer with enhanced water-repellency, oil-repellency, antifouling properties, and friction durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fluorine-containing silane compound is used to form a surface-treating layer, then water-repellency and oil-repellency are achieved, but friction durability is insufficient
Solution Approach 1:
The patent changes the molecular structure parameters of the fluorine-containing silane compound by increasing the number of repeating units in the polyethylene chain (g ≥ 2) and adjusting the ratio of polyethylene chains to perfluoropolyether units. This structural parameter change enhances the flexibility and durability of the surface-treating layer while maintaining its water- and oil-repellent properties, thereby improving friction durability for long-term functionality.
2Illumination intensity
If the surface-treating layer is made thinner to maintain light permeability, then transparency is improved, but friction durability decreases
Solution Approach 1:
The patent achieves high friction durability in thin films by changing the molecular structure parameters of the fluorine-containing silane compound. Specifically, increasing the number of repeating units (g ≥ 2) and optimizing the ratio of polyethylene chains to perfluoropolyether units enhances the mechanical strength and flexibility of the layer, enabling it to maintain high friction durability even at thicknesses suitable for optical applications requiring 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 effectively forms a layer with improved friction durability, water-repellency, oil-repellency, and antifouling properties, suitable for use as an antifouling or waterproof coating, enhancing the performance of optical members and touch panels.
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 number of repeating units of a polyethylene chain having a Si atom in its side chain is ≥ 2
Implementation Method 3
excellent water-repellency, oil-repellency and antifouling property
Data Source
AI summary
The present invention relates to a surface-treating agent comprising at least one perfluoro(poly)ether group containing silane compound of the formula (1): wherein each of symbols is as defined in the description, wherein a number average molecular weight of the perfluoro(poly)ether group containing silane compound is 3000 or more and 6000 or less, and 80 mol% or more of the perfluoro (poly) ether group containing silane compound contained in the surface-treating agent is a compound wherein g is 2 or more.