How are antioxidants integrated into WPC formulations to prevent outdoor trash can degradation?

Antioxidants are critically integrated into Wood Plastic Composite (WPC) formulations to combat the degradation of outdoor trash cans caused by environmental factors like UV radiation, heat, and moisture. The primary mechanism involves incorporating specific antioxidant additives directly into the polymer matrix during the compounding phase. These antioxidants, which include hindered amine light stabilizers (HALS) and phenolic antioxidants, function by interrupting the oxidative chain reaction. They scavenge free radicals generated when UV light attacks the polymer chains, thereby preventing the breakdown of molecular structure. This protection significantly reduces surface chalking, color fading, loss of mechanical strength, and brittleness. By stabilizing the plastic component against oxidation, antioxidants work synergistically with other additives like UV absorbers and pigments to dramatically extend the service life and maintain the aesthetic appearance of WPC trash cans in harsh outdoor environments.