Long-term use or non-use of colored steel coils can lead to aging, as they are inevitably exposed to sunlight during prolonged construction projects or storage. Prolonged direct sunlight can cause aging, which is hard to prevent. However, there are ways to proactively prevent or slow down the aging process. How should we go about it?

The prerequisite for the aging or photochemical reaction of color-coated steel coils is the ability of the surface composition to absorb radiation; secondly, when the absorbed radiation energy of the molecular structure exceeds the bond energy of the molecular structure, the coating of the color-coated steel coil can undergo dissolution. This is because the less the light wavelength of the light source, the more kinetic energy it contains.

Based on this fundamental theory, the embrittlement of color steel coils in atmospheric pollution occurs when the coating molecular structure absorbs the kinetic energy of ultraviolet wavelengths in natural light that exceed its molecular structural bond energy, leading to the dissolution of the coating molecular structure. Subsequently, as the polyurethane paint ages, the base material gradually diminishes, causing the coating surface to become rough and lose its luster. After such loss of the base material, a relatively stable color paste residue remains, existing as unbound powder on the surface of the polyurethane paint. This entire process is referred to as delamination.

In summary, there is a significant difference in the anti-aging properties of polyester color-coated steel coils with varying coating thicknesses. Coils with thin coatings have weaker anti-aging capabilities, while those with normal coating thicknesses generally exhibit good anti-aging characteristics.