1、 Good stability: Powder coatings require that the resin maintains stable performance during storage and use, without any decomposition, deterioration, or agglomeration. To meet this requirement, the molecular structure and synthesis process of the resin need to be carefully designed and optimized.
2、Compatibility: The resin in powder coatings needs to be compatible with other components such as pigments, fillers, and additives to ensure the uniformity and stability of the coating system, avoiding issues like floating color and mottling during application.
3、Suitable melt viscosity: The melt viscosity of the resin significantly affects the application effect of powder coatings. Excessively high melt viscosity can make the coating difficult to flow and level, affecting the appearance and quality of the film; while too low melt viscosity can easily cause the coating to run, leading to uneven coating. Therefore, the resin needs to have an appropriate melt viscosity to ensure good flow and leveling of the coating in the molten state, forming a uniform film.
4、 Glass transition temperature: The glass transition temperature (Tg) of the resin is also an important factor to consider. A Tg that is too high can make the coating too hard at room temperature, making it difficult to apply; while a Tg that is too low can cause the coating to agglomerate during storage and use. Selecting an appropriate Tg for the resin is crucial for ensuring the application performance and storage stability of powder coatings.
5、 Environmental friendliness: High-quality powder materials are usually produced by large manufacturers, ensuring environmental protection. Environmental SGS testing can help identify the environmental quality of powder coatings.
6、 Other quality indicators: Including spray area, powder appearance, texture, shelf life, and powder application rate, etc. High-quality powder coatings have a large spray area, a smooth and fluffy texture, a long shelf life, a high powder application rate, and high application efficiency.
