ã€ALUMINIUM NETWORK】Aluminum profile blending refers to the mutual affinity when two or more materials are mixed. For industrial aluminum powder coatings, the mixed quality not only affects the appearance of powder coatings. , but also have a certain impact on the performance of the film. Good mixing powder coating has good leveling performance, high gloss, excellent mechanical properties, excellent adhesion and anti-corrosion coating, and poor mixing will have undesirable consequences for the coating after film formation, such as Pinholes, shrinkage holes, loss of light, certain properties of orange peel.
The influence of the main raw materials, the resin is the main film-forming material of powder coating, aluminum profiles including epoxy resin, polyester resin and so on. For resins used in powder coatings, the distribution of their molecular weight is very important. In order to form a good coating, the molecular weight of the resin is balanced and the molecular weight distribution is as narrow as possible. An excessively wide molecular weight distribution means that the presence of too small or too large a molecular weight means that it cannot be well blended with the other components of the coating. Under such conditions, high-temperature baking results in poor mixing between the coatings. The surface tension of the coating is also not balanced, and the forces between the particles will produce repulsive or contracting motions, while the melt flow time is limited. There can be no sufficient leveling time between them, along with the coating. Curing, shrinkage orange peel and other defects appear on the surface of the industrial aluminum coating film.
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