Oligomers, also known as prepolymers, are the backbone of UV-curable resin coatings. As the fundamental component within the coating system, oligomers play a pivotal role in determining various performance characteristics of the coating, such as adhesion, hardness, flexibility, abrasion resistance, heat resistance, chemical resistance, durability, optical properties, and aging resistance.
Types of Oligomers in UV-Curable Resins
In the research and application of UV-curable resin coatings, we have identified a diverse range of oligomers, with unsaturated polyesters being among the most common. The curing speed of UV coatings must be adjusted based on factors like substrate, coating thickness, and curing distance. If the curing speed is too fast, the coating on the substrate surface may become sticky or surface-cured while remaining uncured internally. Conversely, a slow curing speed might lead to the aging of the substrate surface.
Environmental Considerations in UV Coating Application
The temperature of the working environment significantly impacts the viscosity of UV coatings. When viscosity changes are substantial, it’s advisable to adjust the room temperature, typically maintaining it between 15-25°C for optimal results. Additionally, it’s crucial to avoid direct sunlight during the curing process to prevent premature curing.
Advantages of UV-Curable Resins Over Traditional Coatings
Traditional coatings used in the industry, such as PU (Polyurethane), PE (Polyester), and NC (Nitrocellulose) coatings, are typically applied using spray techniques. However, these methods are often inefficient, costly, and environmentally unfriendly, posing health risks to workers. In contrast, UV-curable resins are heralded as the “green industrial technology of the 21st century,” offering numerous advantages, including environmental friendliness, cost-effectiveness, ease of mechanized operation, and high efficiency. As more businesses recognize the benefits of UV-curable resins, their adoption is increasing rapidly, setting the stage for widespread industry use in the future.
Post time: Aug-29-2024
