Weather-resistant sand grain powder coating for aluminum profile
The influence of the choice of polyester resin type, the amount of curing agent, and the choice of pigment and filler in the formulation of sand grain powder coatings for architectural aluminum profiles on the weather resistance and boiling resistance of the coating, as well as the influence of additives on the texture of the coating, etc. Influence.
Sep 28,2021
The influence of the choice of polyester resin type, the amount of curing agent, and the choice of pigment and filler in the formulation of sand grain powder coatings for architectural aluminum profiles on the weather resistance and boiling resistance of the coating, as well as the influence of additives on the texture of the coating, etc. Influence.
In this study, weather-resistant sand-grain powder coatings suitable for outdoor architectural aluminum profile coating have been obtained, and all performance indicators have reached the relevant national standards for aluminum profiles.
Metal profiles are widely used in the construction industry due to their excellent durability, decoration and processing formability. However, aluminum profiles account for more than 80% of metal profiles due to their good processing performance and light weight. Therefore, the application of powder coatings in aluminum profiles has rapidly increased.
Especially the aluminum building materials sprayed with powder coatings, compared with the surface treatment methods of anodizing and electrophoretic coating, the pollution degree to water and the atmosphere and the energy consumption are significantly reduced.
The mechanical properties of the coating film, such as hardness, abrasion resistance, acid resistance, etc., have been greatly improved. The service life is twice as long as that of ordinary anodized aluminum, and the color is rich, which can better reflect the diversity and individuality of the building.
At present, powder electrostatic spraying has become a hot spot in the surface coating of aluminum profiles in China. Powder spraying combined with thermal transfer technology for profiles will make it more fashionable and give powder sprayed profiles more room for development.
Most of the powder coatings applied to aluminum profiles are leveling powder coatings, which have general weather resistance. However, the surface of aluminum profiles coated with leveling powder coatings is easily scratched and easily discolored during the transportation process and the environment in which they are used.
Therefore, leveling powder coatings for aluminum profiles are increasingly becoming a non-mainstream product. Sand grain powder coatings for aluminum profiles have just solved this problem and are being used in large numbers.
Because aluminum profiles have a large number of corners, it is generally difficult to completely coat the corners of aluminum profiles with electrostatic spraying powder coatings, which affects the appearance; and due to the specific use environment of aluminum profiles, aluminum profile powder coatings must have good boiling resistance To avoid discoloration during use.
The powder rate on the corners of conventional powder coatings currently used on aluminum profiles is generally around 40%, and insufficient powder on the corners affects the appearance of the corners; the color difference ΔE for boiling resistance is generally about 2.0, and the discoloration can be seen by visual inspection. Affect.
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