UV-Curable Antireflective Coating with Metal Fluoride and Chelating Agent
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Solution Overview
Problem
Existing antireflective coating films face challenges with mechanical strength, adhesion to substrates, high curing temperatures, and dust attachment issues, particularly when using metal fluoride particles with a refractive index of 1.40 or less, which are often coated using wet methods that result in low mechanical strength and poor adhesion.
Innovation Solution
A UV-curable antireflective coating composition incorporating a photopolymerizable acrylate monomer, metal fluoride particles with a refractive index of 1.40 or less, and a dispersion-enhancing chelating agent to improve compatibility, mechanical strength, adhesion, and prevent dust attachment, while allowing for low-temperature UV curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If wet coating method is used to coat metal fluoride particles, then low refractive index film is formed, but mechanical strength and adhesion to substrate are deteriorated
Solution Approach 1:
The patent uses a composite coating liquid containing both metal fluoride particles (for low refractive index) and UV-curable resin components (for mechanical strength and adhesion). The resin forms a binding matrix that holds the metal fluoride particles together, creating a composite structure that achieves both optical performance and mechanical durability.
Solution Approach 2:
The UV-curable resin acts as an intermediary substance that facilitates the attachment of metal fluoride particles to the substrate. The resin forms an adhesive layer that bonds the particles to the substrate while maintaining the low refractive index property through the dispersed metal fluoride particles.
2Stability of the object's composition
If wet coating method is used to coat metal fluoride particles, then low refractive index film is formed, but adhesion to substrate is deteriorated
Solution Approach 1:
The coating liquid combines metal fluoride particles with UV-curable resin components that provide adhesive properties. The resin forms a bonding matrix that ensures strong adhesion to the substrate while the dispersed metal fluoride particles maintain the low refractive index characteristic.
Solution Approach 2:
The UV-curable resin serves as an intermediary that enhances adhesion between the metal fluoride particles and the substrate. It creates a chemical bond that secures the particles to the substrate while preserving the optical properties.
3Reliability
If heat curing method is used, then coating is cured, but curing temperature is high and curing time is long
Solution Approach 1:
The patent replaces the thermal curing mechanism with a photopolymerization mechanism. UV light irradiation triggers the photopolymerization of the resin components, enabling curing at ambient temperatures without requiring high heat, thus reducing both curing temperature and time.
Solution Approach 2:
The curing method is changed from thermal to photchemical. By using UV light as the energy source instead of heat, the curing process occurs at lower temperatures and faster rates, while still achieving complete curing of the coating formulation.
4Stability of the object's composition
If fluoric silane compound is used, then low reflection and stain resistance are achieved, but film surface becomes easily electrically charged and dust adheres
Solution Approach 1:
The UV-curable resin acts as an intermediary layer that modifies the surface properties. It provides a smoother, less surface-energy surface that reduces dust adhesion while the embedded metal fluoride particles maintain the low reflection property.
Solution Approach 2:
The surface energy is modified by incorporating UV-curable resin components that create a different surface chemistry compared to fluoric silane alone. This changes the surface properties to reduce electrical charging and dust attachment while maintaining optical performance.
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 solution provides an antireflective coating film with enhanced mechanical strength, improved adhesion to substrates, reduced curing time, and effective prevention of dust attachment, as demonstrated by improved performance in experimental examples compared to comparative coatings.
Implementation Method 1
a photopolymerizable acrylate monomer (C1); a particle-type metal fluoride (C2) with a refractive index of 1.40 or less; a photopolymerization initiator (C3)
Implementation Method 2
at least one liquid dispersion-enhancing chelating agent (C4) selected from the group consisting of Mg(CF3COO)2, Na(CF3COO), K(CF3COO), Ca(CF3COO)2, Mg(CF2COCHCOCF3)2 and Na(CF2COCHCOCF3)
Implementation Method 3
a particle-type metal fluoride (C2) with a refractive index of 1.40 or less
Data Source
AI summary
An antireflective coating composition includes a photopolymerizable acrylate monomer (C1); a particle-type metal fluoride (C2) with a refractive index of 1.40 or less; a photopolymerization initiator (C3); and at least one liquid dispersion-enhancing chelating agent (C4) selected from the group consisting of Mg(CF3COO)2, Na(CF3COO), K(CF3COO), Ca(CF3COO)2, Mg(CF2COCHCOCF3)2 and Na(CF2COCHCOCF3). This composition ensures good mechanical strength, excellent adhesion to a substrate, short curing time by UV curing, prevention of dust attachment, good erasure of stain, good dust removal and good scratch resistance, so it is usefully for making an antireflective coating film of a display.