Fluoropolyether Polymer Coating for Eraser Abrasion Resistance
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Solution Overview
Problem
Existing fluoropolyether-containing polymers used for forming coatings on touch panels and other displays suffer from poor abrasion durability, particularly when subjected to eraser abrasion, despite exhibiting high water/oil repellency and initial anti-fouling performance.
Innovation Solution
A fluoropolyether-containing polymer with a hydroxy-containing silyl group or hydrolyzable silyl group, represented by a specific general formula, is used to create a surface treating agent that forms a cured coating with improved water/oil repellency and eraser abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoropolyether-containing compounds are used to form water/oil repellent layers, then water/oil repellency and easy stain wipe-off are improved, but adhesion to substrate deteriorates
Solution Approach 1:
The patent uses composite materials by combining fluoropolyether-containing polymer with silane coupling agents. The silane component forms chemical bonds with the substrate surface while the fluoropolyether component provides water/oil repellency. This composite approach allows both adhesion and repellency functions to coexist in a single coating system.
Solution Approach 2:
The silane coupling agent acts as an intermediary between the fluoropolyether polymer and the substrate. It contains reactive silyl groups that bond to the substrate and organic functional groups that interact with the fluoropolyether, mediating the interface between the repellent coating and the substrate to achieve both adhesion and repellency.
2Strength
If silane coupling agents are used to improve substrate adhesion, then adhesion strength is improved, but abrasion durability against eraser deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the silane coupling agent by selecting specific organic functional groups (such as epoxy, carboxyl, or isocyanate groups) that provide both adhesion and abrasion resistance. It also optimizes the molecular weight and structure of the fluoropolyether polymer to achieve balanced performance in both adhesion and abrasion durability.
3Strength
If fluoropolyether-containing polymer with hydrolyzable silyl group is used, then substrate adhesion is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-introducing hydrolyzable silyl groups into the fluoropolyether-containing polymer during polymerization. This preliminary modification allows the polymer to self-adhere to the substrate through moisture-cured silane reactions after coating, eliminating the need for separate adhesion promotion steps and simplifying the overall manufacturing process.
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 solution enhances substrate adhesion and wettability, resulting in coatings that maintain excellent water/oil repellency and exhibit improved abrasion resistance, specifically against eraser abrasion, compared to previous technologies.
Implementation Method 1
In the presence of airborne moisture or the like, the hydrolyzable silyl groups undergo self-condensation reaction to form a coating. The hydrolyzable silyl groups form chemical and physical bonds with the surface of glass or metal
Implementation Method 2
the hydrolyzable silyl groups undergo self-condensation reaction
Implementation Method 3
The hydrolyzable silyl groups form chemical and physical bonds with the surface of glass or metal, whereby the coating becomes a tough coating having durability
Data Source
AI summary
In the present invention, a surface treatment agent that includes a fluoropolyether group-containing polymer represented by formula (1) and/or a partial (hydrolysis) condensate of the polymer can form a cured coating film having excellent water/oil repellency and excellent abrasion resistance. (Rf is a monovalent or divalent fluoroxyalkylene group-containing polymer residue; L is a divalent hetero atom; L' is a single-bonded or divalent hetero atom; Y is a divalent to hexavalent group; R is an alkyl group or a phenyl group; X is a hydroxyl group, a hydrolyzable group or a group represented by formula (2); n is 1-3 for each Si; m is 1-5; X' is a hydroxyl group or a hydrolyzable group; V is a single-bonded or divalent to hexavalent group; E is a monovalent polyether group; o is 1-5; and α is 1 or 2.)