Perfluoropolyether Silane for Friction-Durable Coatings
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Solution Overview
Problem
Conventional perfluoropolyether group containing silane compounds do not provide sufficient friction durability for surface-treating layers, which are required for applications such as optical members and touch panels that need to maintain water-repellency, oil-repellency, and antifouling properties over time.
Innovation Solution
A perfluoro(poly)ether group containing silane compound with multiple Si atoms and hydrolyzable groups is developed, specifically formulated to enhance friction durability by forming a surface-treating layer with improved water-repellency, oil-repellency, and antifouling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional perfluoropolyether group containing silane compound is used to form a surface-treating layer, then water-repellency, oil-repellency and antifouling property are provided, but friction durability is insufficient
Solution Approach 1:
The invention changes the chemical structure parameters of the silane compound by introducing multiple Si atoms with hydrolyzable groups into the molecular chain. This structural parameter change enables the formation of a crosslinked network structure in the surface-treating layer, which significantly improves friction durability while maintaining water-repellency, oil-repellency and antifouling properties.
Solution Approach 2:
The invention creates a composite structure by incorporating multiple functional groups (perfluoropolyether groups, hydrolyzable groups, and crosslinking structures) within a single silane compound molecule. This composite molecular design allows the surface-treating layer to exhibit both the desired surface properties and enhanced mechanical durability simultaneously.
2Illumination intensity
If the surface-treating layer is made thinner to maintain light permeability for optical members, then transparency is preserved, but friction durability deteriorates
Solution Approach 1:
The invention changes the structural parameters of the surface-treating layer by creating a crosslinked network through multiple Si atoms with hydrolyzable groups. This network structure provides mechanical reinforcement that allows the layer to maintain both thinness (for light permeability) and high friction durability simultaneously.
Solution Approach 2:
The invention applies local quality enhancement by concentrating the crosslinking structure at the interface between the surface-treating layer and the base material, while maintaining the perfluoropolyether groups on the surface for optical properties. This localized structural optimization allows thin film thickness without sacrificing friction durability.
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 new silane compound effectively forms a surface-treating layer with enhanced friction durability, maintaining desired properties over time, particularly suitable for optical members and touch panels.
Implementation Method 1
a perfluoropolyether group containing silane compound having a plurality of Si atom having a hydrolyzable group
Data Source
AI summary
A perfluoro(poly)ether group containing silane compound of formula (1a) or (1b):(Rf-PFPE)β-X—(CRakRblRcm)α (1a)(RcmRblRakC)α—X-PFPE-X—(CRakRblRcm)α (1b)wherein the symbols are as defined herein.