The best technological parameters of leveling factors for powder coating of aluminum profile

Leveling property of powder coating is affected by leveling agent, structure of film-forming resin and curing mechanism In order to improve the leveling effect of powder coatings, some measures such as adding appropriate leveling AIDS, selecting resin system with low melting viscosity, increasing the surface tension of the coating, increasing the curing temperature of the coating, prolonging the curing time, increasing the thickness of the coating and reducing the particle size of the powder are often used in production and application However, the leveling mechanism of powder coating is relatively complex, and there are many factors that affect the leveling Some factors are contradictory and restrict each other, which need to be considered comprehensively On the basis of ensuring the mechanical properties of the coating, the coating with excellent leveling performance should be obtained as much as possible The researchers of Hunan Institute of Chemical Technology analyzed the factors influencing the leveling of powder coating from the aspects of resin, leveling agent, degasifier, pigment, particle size, etc Combined with the production practice, taking a9016sf75, a special powder coating for aluminum profile, as an example, the better technological parameters of leveling property of powder coating for aluminum profile are put forward: polyester resin glass transition temperature (TG) 50-65 ℃, acrylate leveling agent 1.0% - 1.3%, benzoic acid leveling agent 0.6%, powder particle size 20-80 μ m, curing temperature 200 ℃, curing time 20min, which can greatly reduce powder coating The occurrence of pinhole, orange peel, shrinkage and other defects in the film can obtain an ideal flat and smooth film.