Discussion on Low Temperature Curing Powder Coatings

Low temperature curing powder coatings will be the fastest growing variety in the global low temperature curing coatings market in the next few years. This variety has the characteristics of zero VOC emission, and can obtain thicker coating films at one time compared with conventional liquid coatings, and no sagging occurs. In addition, it is also superior to conventional coatings in other properties, such as corrosion resistance, coating appearance, stone chip resistance, abrasion resistance, durability, cost performance, construction time, etc.





The method for synthesizing low-temperature curing powder coatings includes the following steps: adding polyols, polyacids and catalysts into a four-necked flask equipped with a stirrer, a reflux condenser and a water separator; introducing nitrogen gas, gradually heating up and melting, starting stirring and flowing The condensed water is gradually heated up and then kept warm until the acid value and viscosity reach the standard to obtain a hydroxyl-terminated polyester resin intermediate; cooling, adding an end-capping agent to acidify the end-capping of the resin, vacuum polycondensation until the acid value, hydroxyl value and viscosity are qualified, cooling, Add antioxidant additives, stir evenly, and discharge to obtain carboxyl-terminated polyester resin; prepare the carboxyl-terminated polyester resin, curing agent, titanium dioxide, barium sulfate, leveling agent, brightener, and benzoin into powder coatings; The prepared powder coating is electrostatically sprayed and cured to obtain a low-temperature curing powder coating.

Development direction of low temperature curing powder coatings
To reduce the curing temperature of powder coatings, the following will be discussed from the main resin, curing agent, catalyst, infrared light curing, ultraviolet light curing, spray drying method to manufacture powder coatings and free radical reaction curing.