Diamond-Enhanced Cationic Coatings Overcoming Oxygen Inhibition
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Solution Overview
Problem
Existing abrasion-resistant coatings require large amounts of aluminum oxide and fail to utilize the benefits of diamond particles effectively, and suffer from oxygen inhibition during UV curing, limiting their application in atmospheric conditions.
Innovation Solution
Development of cationic and thiol-ene cured resin systems combined with diamond particles that can cure in the presence of oxygen, including atmospheric levels, using UV light for durability and resistance to scratching and staining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyacrylate-based coating compositions with free radical photoinitiators are used for UV curing, then the coating can be cured under UV light, but oxygen inhibition occurs during curing
Solution Approach 1:
The patent changes the chemical parameters of the curing system by using cationic photoinitiators (sulfonium or iodonium salts) instead of free radical photoinitiators, and employs vinyl ether or epoxy resins as the curable component. This parameter change transforms the curing mechanism from free radical polymerization to cationic polymerization, which is not inhibited by oxygen, thereby resolving the oxygen inhibition problem while maintaining UV curability
Solution Approach 2:
The patent introduces a specific intermediary system consisting of cationic photoinitiators (such as sulfonium salts like triarylsulfonium hexafluoroantimonate or iodonium salts) that mediate the UV curing process through cationic polymerization mechanism. This intermediary system allows the coating to cure in the presence of oxygen by using a different chemical pathway that does not involve free radicals susceptible to oxygen inhibition
2Strength
If large amounts of aluminum oxide are used in curable coating compositions, then abrasion resistance is improved, but the usage efficiency of abrasion resistant material decreases
Solution Approach 1:
The patent creates a composite coating system that combines cationic cured resin (vinyl ether or epoxy) with diamond particles as the abrasion resistant material. This composite material approach allows for highly efficient utilization of diamond particles, achieving superior abrasion resistance with much lower concentrations (0.1-10 wt%) compared to traditional aluminum oxide formulations, thereby improving material usage efficiency while enhancing strength
Solution Approach 2:
The patent changes the type of abrasion resistant material from aluminum oxide to diamond particles, and modifies the matrix composition to cationic cured resin. This parameter change in material selection and composition enables more efficient use of the abrasion resistant material, as diamond's superior hardness and chemical stability allow for effective protection at lower loadings
3Use of energy by moving object
If UV LED is used to cure polyacrylate-based coating compositions, then energy efficiency is improved, but oxygen inhibition becomes even worse
Solution Approach 1:
The patent changes the fundamental curing chemistry from free radical to cationic polymerization, which is compatible with UV LED curing. The cationic photoinitiators used (sulfonium or iodonium salts) can be effectively activated by UV LED wavelengths, maintaining energy efficiency while eliminating oxygen inhibition through the different reaction mechanism that proceeds via oxonium ion intermediates rather than free radicals
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 coatings provide enhanced durability and resistance to abrasion and staining, allowing for efficient use of abrasion-resistant materials and overcoming the limitations of oxygen inhibition during curing.
Implementation Method 1
photoinitiators present in polyacrylate-based coating compositions will absorb light and produce free radicals when exposed to, e.g., conventional UV lamps; the free radicals then initiate crosslink reactions of the polyacrylate-based coating composition
Implementation Method 2
these systems are combined with abrasion resistant material, such as diamond
Data Source
AI summary
Disclosed are cationic cure resin systems and thiol-ene cure systems, which include abrasion resistant material such as diamond material. The systems are coated onto substrates. Floor coverings comprising the coated substrates are also disclosed.