Perfluoropolyether Silane UV Resistance Surface Treatment
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Solution Overview
Problem
Conventional perfluoropolyether group-containing silane compounds used for surface treatments deteriorate due to exposure to ultraviolet (UV) light, particularly in outdoor applications such as eyeglasses and touch panels, leading to a loss of water-repellency, oil-repellency, and antifouling properties.
Innovation Solution
A novel perfluoro(poly)ether group-containing silane compound with a specific structure, represented by formulas (A1), (A2), (B1), and (B2), which enhances UV resistance and maintains water-repellency, oil-repellency, and antifouling properties by incorporating specific alkyl and perfluoropolyether groups, forming a stable surface-treating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional perfluoropolyether group-containing silane compounds are used for surface treatment, then water-repellency, oil-repellency, and antifouling properties are achieved, but UV resistance is poor leading to deterioration under ultraviolet exposure
Solution Approach 1:
The patent modifies the molecular structure parameters of the silane compound by introducing specific structural features (formula A with R23/R24 groups or formula B with R73/R74 groups) to enhance UV resistance while preserving the perfluoropolyether functionality for water and oil repellency
Solution Approach 2:
The invention creates a composite molecular structure combining perfluoropolyether chains with specific silane structural units (R23/R24 or R73/R74 groups) that work synergistically to provide both the desired surface properties and improved UV stability
2Reliability
If perfluoropolyether group-containing silane compound is applied as a thin film, then light permeability and transparency are achieved suitable for optical members, but durability under UV exposure is reduced
Solution Approach 1:
The patent optimizes the molecular weight and structural parameters of the silane compound (using specific formulas with controlled chain lengths and terminal groups) to achieve a balance between forming effective thin films for optical applications and providing sufficient UV resistance for long-term outdoor 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 novel silane compound forms a surface-treating layer with enhanced UV resistance, ensuring the durability of water-repellency, oil-repellency, and antifouling properties, even under outdoor exposure to UV light.
Implementation Method 1
having a hydrolyzable group bound to a Si atom
Implementation Method 2
A layer obtained from a surface-treating agent including a fluorine-containing silane compound
Implementation Method 3
enhancement in UV resistance of a surface-treating layer
Data Source
AI summary
A perfluoro(poly)ether group-containing silane compound represented by formula (A1), (A2), (B1) or (B2), wherein the symbols are as defined in the description. Also disclosed is a surface-treating agent including the silane compound, a pellet including the surface-treating agent and an article including a base material and a layer formed from the silane compound or surface-treating agent.(Rf-PFPE)α′-X1—(SiRakRblRcm)α (A1)(RcmRblRakSi)α—X1-PFPE-X1—(SiRakRblRcm)α (A2)(Rf-PFPE)γ′-X2—(CRdk2Rel2Rfm2Rgn2)γ (B1)(Rgn2Rfm2Rel2Rdk2C)γ—X2-PFPE-X2—(CRdk2Rel2Rfm2Rgn2)γ (B2)