The weather resistance of the powder coating film on the surface of the aluminum profile is a key factor affecting the life of the aluminum profile. Powder coatings are mainly composed of resins, curing agents, additives, pigments and fillers, etc. The coatings sprayed on the surface of aluminum profiles are affected by surrounding natural factors such as sunlight, rain, oxidation, changes in heat and cold, and microorganisms over time. There will be a phenomenon of gradual degradation of performance, that is, aging. The ability of powder coatings to inhibit or delay natural aging is called natural aging resistance, referred to as aging resistance, also known as weather resistance.
There are many factors that affect the weather resistance of powder coatings, including the performance, dosage, ratio and other internal factors of various raw materials such as resins, curing agents, pigments and fillers, and additives in the powder coating components; The degree of curing of the coating; and the use environment of the coating film, such as the effect of sunlight (mainly ultraviolet rays), the composition of the atmosphere (oxygen, ozone, industrial smog, etc.), humidity (including acid rain, salt spray, etc.), temperature changes and other external factors .
From the perspective of powder coating itself, improving the weather resistance of powder coating mainly starts from the aspects of raw materials, formula structure and production process.