How does resin coupling agent concentration affect moisture resistance in WPC flower boxes?

The moisture resistance of Wood-Plastic Composite (WPC) flower boxes is significantly influenced by the concentration of resin coupling agents used in their production. Resin coupling agents act as a bridge between the wood fibers and plastic matrix, improving interfacial adhesion and reducing water absorption. Higher concentrations of these agents typically enhance moisture resistance by forming stronger bonds, thereby minimizing swelling and degradation. However, excessive amounts may lead to brittleness or uneven dispersion, compromising performance. Optimal concentration balances durability and cost-effectiveness, ensuring long-lasting WPC flower boxes suitable for outdoor use. Understanding this relationship helps manufacturers design products with superior weather resistance and extended lifespan.