What are the effects of plasticizer migration on the flexibility of WPC outdoor trash cans?

Plasticizer migration is a critical factor affecting the long-term performance of Wood-Plastic Composite (WPC) outdoor trash cans. These composites rely on plasticizers to impart initial flexibility and workability during manufacturing. However, when exposed to outdoor elements like rain, UV radiation, and temperature fluctuations, these plasticizer molecules can gradually leach out from the polymer matrix. This loss of plasticizer directly leads to a significant reduction in the material's flexibility. The WPC becomes increasingly brittle and rigid over time, losing its ability to withstand minor impacts or stress without cracking. This embrittlement compromises the structural integrity of the trash can, making it susceptible to damage from handling or environmental stress. Ultimately, plasticizer migration accelerates the aging process, shortening the service life of the product and leading to premature failure, manifested as cracks, breaks, and a general loss of durability. Understanding this phenomenon is essential for manufacturers to develop more stable formulations and for consumers to make informed purchasing decisions.