Fluorochemical Coating Composition for Haze-Free Sliding
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Solution Overview
Problem
Existing fluorochemical coating compositions for touch panels and displays face issues with haze formation when diluted and spray-coated, compromising the visibility and sliding properties of the substrate.
Innovation Solution
A fluorochemical coating composition comprising a hydrolyzable group-containing silane modified with a fluorooxyalkylene-containing polymer and a fluorooxyalkylene-containing polymer with a lower average molecular weight, applied in a specific weight ratio to prevent haze increase and enhance sliding and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluorooxyalkylene-containing silane with terminal groups bound to substrate is used, then water/oil repellency is improved, but sliding properties and flaw resistance become insufficient
Solution Approach 1:
The coating composition is segmented into two functional components: a fluorooxyalkylene-containing silane that bonds to the substrate for water/oil repellency, and a nonfunctional fluorooxyalkylene-containing polymer that provides sliding properties. This segmentation allows each component to perform its specific function without compromising the other.
Solution Approach 2:
The invention uses a composite coating system combining fluorooxyalkylene-containing silane and nonfunctional fluorooxyalkylene-containing polymer. The silane component provides substrate bonding and water/oil repellency, while the polymer component contributes sliding properties and chemical resistance, creating a synergistic composite material.
2Reliability
If nonfunctional oil is added to treating agents for improving durability and sliding properties, then these properties are improved, but haze increases
Solution Approach 1:
The invention changes the molecular weight parameter of the fluorooxyalkylene-containing polymer to optimize performance. By selecting a polymer with molecular weight of 1,000 to 10,000, the composition achieves improved durability and sliding properties while minimizing haze formation, as this molecular weight range provides optimal balance between film-forming ability and optical clarity.
Solution Approach 2:
The nonfunctional fluorooxyalkylene-containing polymer is specifically positioned at the coating surface to provide sliding properties and durability, while the fluorooxyalkylene-containing silane bonds to the substrate. This spatial arrangement ensures that the polymer's lubricity benefits are maximized at the surface while minimizing its impact on substrate optical properties.
3Ease of operation
If fluorooxyalkylene-containing polymer with higher average molecular weight is used, then sliding properties are improved, but compatibility with silane decreases leading to haze increase
Solution Approach 1:
The invention optimizes the molecular weight parameter of the fluorooxyalkylene-containing polymer within the range of 1,000 to 10,000. This parameter optimization ensures sufficient sliding properties while maintaining good compatibility with the fluorooxyalkylene-containing silane, preventing phase separation and haze formation.
Solution Approach 2:
The coating composition is designed to form a homogeneous mixture by selecting a fluorooxyalkylene-containing polymer with appropriate molecular weight that is fully compatible with the fluorooxyalkylene-containing silane. This homogeneity prevents phase separation during application and curing, ensuring uniform coating performance and optical clarity.
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 composition forms a water/oil repellent layer with improved sliding and abrasion resistance without increasing haze, maintaining the substrate's visibility and optical properties.
Implementation Method 1
The alkoxysilyl groups undergo hydrolysis in the presence of airborne moisture or the like. As the alkoxysilyl groups form chemical and physical bonds with the surface of glass or metal, the coating becomes a tough coating having durability.
Data Source
AI summary
A fluorochemical coating composition is provided comprising (A) a hydrolyzable group-containing silane modified with a fluorooxyalkylene-containing polymer and (B) a fluorooxyalkylene-containing polymer having an average molecular weight not higher than the average molecular weight of component (A) in a weight ratio (A)/(B) of 40/60 to 95/5. The composition forms on a substrate a water/oil repellent layer which does not detract from the visibility of the substrate.