Optimum process parameters for leveling factors of aluminum profile powder coatings

The leveling ofpowder coatings is affected by the structure and curing mechanism of leveling additives and film-forming resinsTo improve the leveling effect of powder coatings, the production application softened often uses the addition of appropriate leveling additives, the use of low melting viscosity resin system, increase the surface tension of the coating, improve the coating curing temperature, extend the curing time, increase the thickness of the coating, reduce powder particle size and other measuresHowever, the mechanism of flatness of powder coating is more complex, the factors affecting the flatness of the coating are also more, some factors are mutually contradictory constraints, need to be considered comprehensively, in the basis of ensuring the mechanical properties of the coating film, as far as possible to obtain the flattening performance of excellent coatingResearchers from Hunan Institute of Chemical Engineering and Technology analyzed the factors affecting the flattening of powder coatings from the aspects of resin, leveling agent, degassing agent, pigment, particle size, etcCombined with the actual production, taking the aluminum profile special powder coating A9016SF75 as an example, the better process parameters of the flatness of aluminum profile powder coating are put forward: polyester resin glass temperature (Tg) 50 to 65 degrees C, acrylic leveling agent dosage 1.0% to 13%, restant acid leveling agent dosage 0.6%, powder particle size 20 to 80 m, curing temperature of 200 degrees C, curing time 20min, this condition can greatly reduce the occurrence of powder coating film pinholes, orange peels, shrink holes and other ills, to obtain the ideal smooth coating