Vacuum Electron Beam Curing Methacrylate Coating
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Solution Overview
Problem
Existing methods for forming thin, solid polymeric films using electron beam curing in vacuum conditions face challenges such as premature polymerization, adhesion issues, and equipment contamination due to the use of solvents and acrylate-based compositions, which affect the uniformity and properties of the films.
Innovation Solution
A composition comprising ethylenically unsaturated methacrylate monomers or oligomers, absent of acrylate components and solvents, is applied to a substrate in a vacuum and cured with a low-dose electron beam radiation, maintaining fluidity and achieving improved moisture, oxygen barrier, scratch resistance, and adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If acrylate-based compositions are used for electron beam curing in vacuum, then polymerization occurs rapidly, but premature polymerization and adhesion issues occur
Solution Approach 1:
The patent changes the chemical composition parameters from acrylate-based to methacrylate-based monomers, which have different reactivity characteristics under electron beam irradiation. This parameter change allows control over polymerization kinetics, preventing premature polymerization while maintaining curing efficiency, thereby resolving the adhesion quality issue without sacrificing productivity
2Ease of operation
If solvents are used in the composition, then fluidity is maintained, but equipment contamination and uniformity issues occur
Solution Approach 1:
The patent extracts and removes solvents from the composition entirely, creating a solvent-free formulation. The composition achieves the necessary fluidity through careful selection of monomer molecular weights and combinations, eliminating the source of contamination and uniformity problems while maintaining ease of application
Solution Approach 2:
The patent uses composite monomer systems combining different methacrylate monomers with complementary properties. This composite approach allows optimization of both fluidity and film-forming characteristics without requiring solvents, thereby achieving both ease of operation and manufacturing precision
3Productivity
If vapor deposition is used to form films, then deposition speed is high, but equipment contamination and difficult cleaning occur
Solution Approach 1:
The patent performs the liquid deposition and electron beam curing process in a vacuum environment, creating an inert atmosphere that prevents oxidation and contamination. This allows the use of liquid monomer deposition rather than vapor deposition, maintaining productivity while eliminating the contamination and cleaning issues associated with vapor-phase processes
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 process allows for complete curing with improved film properties, including enhanced moisture and oxygen barriers, scratch resistance, and printability, while avoiding premature polymerization and equipment contamination.
Implementation Method 1
exposing said liquid composition to sufficient electron beam radiation, in a substantially oxygen-free atmosphere, under vacuum conditions, to polymerize or crosslink the composition
Implementation Method 2
The ethylenically unsaturated component is polymerizable or crosslinkable by the application of sufficient electron beam radiation
Data Source
AI summary
A liquid composition and a process for coating the composition onto a surface of a substrate in a substantially oxygen-free atmosphere, under vacuum conditions. The composition comprises one or more components, all of which components do not go into a gas or vapor phase under the vacuum conditions. The composition has an ethylenically unsaturated component composed of an ethylenically unsaturated methacrylate monomer, or a combination of an ethylenically unsaturated methacrylate monomer and an ethylenically unsaturated methacrylate oligomer. The ethylenically unsaturated component is polymerizable or crosslinkable by the application of sufficient electron beam radiation. The composition is substantially absent of ethylenically unsaturated acrylate components, substantially absent of polymerization initiators, and substantially absent of solvents. The composition optionally further comprises one or more polymers without an acrylate functional group and without a methacrylate functional group. The composition optionally further comprises one or more of waxes, pigments, and/or wetting agents.