Quality requirements for resins for powder coatings

 1. Good stability: Powder coating requires the resin to maintain stable performance during storage and use, and should not decompose, deteriorate or agglomerate. To achieve this requirement, the molecular structure and synthesis process of the resin need to be carefully designed and optimized.

2. Compatibility: The resin in powder coating needs to have good compatibility with other components such as pigments, fillers, and additives to ensure the uniformity and stability of the coating system and avoid problems such as floating color and blooming during the coating process.

3. Appropriate melt viscosity: The melt viscosity of the resin has an important impact on the coating effect of powder coating. High melt viscosity will cause the paint to flow and level difficultly, affecting the appearance and quality of the coating film; Too low melt viscosity can easily lead to paint flow, resulting in an uneven coating. Therefore, resins need to have the right melt viscosity to ensure that the coating can flow and level well in the molten state, forming a uniform coating film.

4. Glass transition temperature: The glass transition temperature (Tg) of the resin is also an important factor to consider. too high Tg will cause the paint to be too hard at room temperature and not easy to paint; Too low Tg will make the paint easy to agglomerate during storage and use. Selecting the appropriate resin Tg is crucial for ensuring the coating performance and storage stability of powder coatings.

5. Environmental protection: High-quality powder materials usually come from large factories, and environmental protection is guaranteed. Environmental protection SGS testing can help identify the environmental quality of powder coatings.

6. Other quality indicators: including spraying area, powder appearance, feel, shelf life, powder loading rate, etc. High-quality powder coating has a large spraying area, smooth and fluffy feel, long shelf life, high powder loading rate and high spraying efficiency