UV Curable Acrylic Coating Adhesion to Subsequent Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing UV curable acrylic coatings face challenges in achieving good adhesion for subsequent coatings, particularly sol/gel antireflective coatings, due to poor wetting properties and adhesion issues, which are not adequately addressed by current technologies.
Innovation Solution
A photocurable, UV curable abrasion-resistant coating composition is developed, comprising specific acrylate, epoxy, and silanol compounds, along with non-polymerizable ether compounds, carefully formulated to provide excellent abrasion resistance and adhesion to various substrates without requiring additional pretreatment steps, ensuring strong bonding with subsequent coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If UV curable acrylic coatings are used as anti-abrasion coatings, then abrasion resistance is improved, but adhesion of subsequent coatings deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the UV curable acrylic coating by incorporating specific ratios of monomers (acrylonitrile, vinyl acetate, vinyl alcohol), epoxy compounds, and silane compounds. This parameter change enables the coating to simultaneously achieve high abrasion resistance and good adhesion for subsequent coatings without requiring pretreatment, directly resolving the technical contradiction between abrasion resistance and adhesion.
Solution Approach 2:
The patent creates a composite coating system combining multiple functional components: acrylic polymer matrix for abrasion resistance, epoxy compounds for adhesion promotion, and silane compounds for crosslinking and bonding. This composite material approach allows the coating to exhibit both abrasion resistance and excellent adhesion properties, eliminating the need for separate pretreatment steps while maintaining both performance requirements.
2Productivity
If conventional UV curable acrylic coatings are applied, then coating application speed is improved, but wetting properties and adhesion deteriorate
Solution Approach 1:
The patent adjusts the chemical parameters of the coating formulation by incorporating specific amounts of epoxy compounds (2-10 parts by weight) and silane compounds (1-7 parts by weight) into the UV curable acrylic system. These parameter changes improve wetting properties and adhesion while maintaining the fast curing characteristics of UV curable coatings, thus resolving the contradiction between application speed and adhesion quality.
3Reliability
If additional pretreatment steps are applied to improve adhesion, then adhesion of subsequent coatings is improved, but process complexity and time increase
Solution Approach 1:
The patent incorporates adhesion-promoting components (epoxy compounds and silane compounds) directly into the UV curable acrylic coating formulation before application. This preliminary action embeds the adhesion enhancement functionality within the coating itself, eliminating the need for separate pretreatment steps such as soap wash, caustic treatment, corona, or plasma. The coating inherently provides both abrasion resistance and adhesion promotion, reducing process complexity while maintaining adhesion quality.
Solution Approach 2:
The patent merges multiple functions into a single coating layer: abrasion resistance, adhesion promotion, and crosslinking are all achieved in one application through the combined action of acrylic polymer, epoxy compounds, and silane compounds. This merging eliminates the need for multiple separate pretreatment and coating steps, directly reducing process complexity while maintaining or improving adhesion 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 composition achieves excellent abrasion resistance and adhesion to a wide range of substrates, including polycarbonate materials, and provides strong bonding for subsequent coatings, including sol/gel antireflective coatings, without the need for additional pretreatment, enhancing the durability and performance of optical articles like ophthalmic lenses.
Implementation Method 1
The invention relates to a photocurable, preferably UV curable abrasion resistant coating composition
Implementation Method 2
comprising 15 to 30 parts by weight of at least one monomeric compound A having from 5 to 7 acrylate groups; 7 to 20 parts by weight of at least one monomeric or oligomeric compound A' selected from monomers or oligomers having from 3 to 4 acrylate groups
Data Source
AI summary
An abrasion resistant photocurable acrylic coating composition that can provide good adhesion to subsequent coatings deposited thereon, and a hard coated article, especially an optical article such as an ophthalmic lens, comprising a substrate coated with a coating obtained from the above abrasion resistant acrylic coating composition providing good subsequent adhesion.