Antioxidant masterbatches are used to prevent thermal degradation and reduce oxidation in polymer products. Antioxidants are typically divided into two categories:
- Primary Antioxidants: These antioxidants primarily extend the service life of the final product by protecting it from oxidative degradation. They work by scavenging free radicals and preventing the chain reactions that lead to oxidation, thereby improving the durability and performance of the plastic.
- Secondary Antioxidants: These antioxidants are used to improve the processing during production, particularly in cases where the product is exposed to heat multiple times throughout the manufacturing process. They help stabilize the polymer during thermal processing and prevent premature degradation, ensuring the material maintains its desired properties throughout production.
Secondary antioxidants are particularly important in cases where the product undergoes repeated heating, such as in processes like extrusion, injection molding, or blow molding, where the material may be exposed to elevated temperatures multiple times. These antioxidants help maintain the polymer’s integrity and ensure the final product meets the necessary quality standards.