Views: 0 Author: Site Editor Publish Time: 2022-09-19 Origin: Site
Color steel coil application time is too long or long-term application will produce aging, long-term engineering construction or storage will be exposed to the sun. After long-term direct exposure to light, aging will occur. It is impossible for people to prevent, but people can prevent the speed of aging early in normal times, so what should people do?
The first prerequisite for aging or photochemical reaction of color steel coil is that the surface components of color steel coil can digest and absorb radiation; Second, when the radiation energy absorbed by the molecular structure digestion exceeds the bond energy of the molecular structure, the coating of color steel coil can be dissolved. Because the fewer wavelengths of light a source has, the more kinetic energy it contains.
According to the basic theory, the embrittlement of color steel coil in air pollution is that the molecular structure of coating absorbs the kinetic energy of ultraviolet band higher than the bond energy of its molecular structure in natural light, resulting in the dissolution of the molecular structure of coating. With the aging of polyurethane coating, the base material itself is slowly missing, and the coating surface slowly becomes not smooth and shiny. Such omissions in the base material leave relatively smooth paste objects, which are left on the surface of the polyurethane coating in an unbonded powder form, a process called delamination.
In general, there are great differences in the anti-aging characteristics of polyester color steel coil with different coating thickness. The anti-aging ability of thin coating color steel coil is weak, and the anti-aging characteristics of all normal thin and thick coating are relatively good.
