Hindered Phenol Antioxidant HPAO

Oxidation of polymers can lead to many undesirable effects including color changes, formation of rough surface morphology, changes in melt viscosity and reduction in mechanical properties, which can affect the service life of the polymer or the final product. Oxidation can occur at every stage of the polymer life cycle, during the production and storage of polymer resins, during high temperature melt processing operations, during the processing of resins into articles, and during the use of the articles. In addition, exposure to UV rays from sunlight also accelerates the oxidation process. Adding antioxidants can inhibit and delay the oxidation and degradation of polymer materials.

Antioxidants are generally divided into primary antioxidants and secondary antioxidants. Primary antioxidants work by scavenging peroxy free radicals formed during oxidation. The two main classes of primary antioxidants are hindered phenols and aromatic amines. They are effective over a wide temperature range, improving material processing and long-term thermal stability.

Secondary antioxidants, such as phosphites and thioethers, work through the decomposition of hydroperoxides. Phosphites are most effective at the high temperatures of melt processing operations, while thioethers work best in the solid phase at long-term use temperatures.

TINTOLL hindered phenolic antioxidants have low volatility, high efficiency, resistance to air fading and hydrolysis, and can be implemented in a wide range of applications.