How to avoid orange peel caused by powder coating

In practical work, active propellants or leveling agents are often used to improve the appearance of the coating to eliminate the appearance defects such as orange peel, shrinkage cavity, etc The active propellant with good performance can reduce the melting viscosity and then help to melt and disperse the pigment to advance the wettability of the substrate The active leveling of the coating can help to eliminate the appearance defects and facilitate the air release The relationship between the amount of active modifier and its action should be investigated The lack of its dosage will lead to shrinkage and orange peel, while the excessive dosage will lead to loss of light, fog and shadow, and the title of adhesion to the upper layer of recoating The general activity modifier will participate in the premixing They or the masterbatch made of resin are adsorbed on the inorganic carrier in the form of powder When the dosage of the additive is 0.5-1.5%, it can also work well Propulsion activities and leveling can reduce or prevent orange peel The system uses lower melting viscosity, longer leveling time during curing and higher surface tension to move forward and level Controlling the surface tension gradient is an important parameter to reduce the orange peel Together with controlling the average surface tension of the coating surface to obtain the minimum surface product.