Abstract
UV curing is a photochemical process in which high-intensity ultraviolet light is used to instantly cure or ��dry�� coatings, inks, adhesives and thin film technology. It has been around as a coating for wood, paper and as a clear coating via photolithography process on printed circuit boards PCBs or integrated circuit boards ICBs for years. It is fast becoming one of the most popular techniques in the paint and coatings industry. Most of the formulation use multifunctional acrylate monomers or oligomers or a mixture of them that crosslink under exposure to UV/EB radiations in a free radical process. We briefly present the advantages of EB vs. UV. A new type of formulation based on multifuctional monomer of dicyclopentadiene epoxy derivative with additional diluent as co-reactive solvent will be described and evaluated. This formulation differs from the acrylate one by the use of a cationic photoinitiator. The final product presents all the advantages of epoxy resins viz. better adherence, mechanical and thermal properties, compared to acrylate systems. Formulation has been optimized thanks to the differential scanning photocalorimetry DPC. This type of formulation is developed for additive digital manufacturing - 3D Printing (building layer by layer).
Highlights
Photochemistry through Ultra Violet (UV) or Electron Beam (EB) radiation has been used for more than 40 years, for coatings, adhesives, inks, and electronics in recent years [1]
Fast curing, excellent film properties, essentially no volatile organic compounds (VOC) are the major benefits among many other advantages compared with conventional solvent-borne thermal curing process which is under increasing pressure from regulatory agencies to limit the amount of solvents emitted into the environment
Curing process may be used for UV Curing of matrices limited to 200-500 μm thickness whereas EB curing is more devoted to polymer matrix fibrous composites (PMFCs) and have been developed due to the need for advanced materials required for aerospace and automotive applications with parts’ thickness up to 10-20 cm, depending of the power of the EB
Summary
Photochemistry through Ultra Violet (UV) or Electron Beam (EB) radiation has been used for more than 40 years, for coatings, adhesives, inks, and electronics in recent years [1]. Curing process may be used for UV Curing of matrices limited to 200-500 μm thickness whereas EB curing is more devoted to polymer matrix fibrous composites (PMFCs) and have been developed due to the need for advanced materials required for aerospace and automotive applications with parts’ thickness up to 10-20 cm, depending of the power of the EB. Major advances have been made in raw materials and equipment designs that make this unique technology available for more and new industrial applications. It is important to control, at room temperature, viscosity, photoreactivity and rapid curing (crosslinking rate) of the formulation in order to have a high-performance system. These parameters are essential to control for the optimization of the manufactured parts
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