Only the light of sunlight with a wavelength of 250-1400nm can radiate to the Earth, of which the wavelength of 780-1400nm is infrared, accounting for about 42%-62% of the total radiation of the sun, mainly to radiate objects with heat; The wavelength 380-780nm is visible light, which accounts for about 39%-53% of the total solar radiation, and mainly affects objects with heat and photochemical reactions.
The wavelength of 250-400nm is ultraviolet light, which mainly affects objects by photochemical reactions. The biggest damage to plastics is 250-400nm ultraviolet light, especially ultraviolet light with a wavelength of about 300nm is the main factor leading to the aging of polyethylene. The increase of temperature will accelerate the photochemical reaction of the plastic film. In general, for every 10 ° C increase in temperature, the reaction speed will double.
In addition to hydrolysis and deformation of plastics caused by rain, it also has erosion damage. Water can also wash away the surface dirt and aging products of the isolation plate, reducing their protective effect and accelerating the aging trend of the coating.
