Phosphite antioxidants represent a vital class of chemical additives crucial for the long-term stability and processability of polymers. Unlike their phenolic counterparts (primary antioxidants), phosphites primarily function as secondary antioxidants by decomposing hydroperoxides, key intermediates in the auto-oxidation process of polymers. This decomposition mechanism effectively prevents the propagation of oxidative chains, thereby safeguarding the polymer’s structural integrity and physical properties. At NINGBO INNO PHARMCHEM CO.,LTD., we specialize in delivering high-quality phosphite antioxidants, such as our widely utilized Phosphite Antioxidant 168, to meet the demanding needs of the global polymer industry.

The chemical composition of phosphite antioxidants, like Phosphite Antioxidant 168 (Tris(2,4-di-tert-butylphenyl) phosphite), is engineered for optimal performance. These compounds are typically white crystalline powders with high melting points, indicative of their thermal stability. Phosphite Antioxidant 168, for instance, boasts excellent resistance to extraction by water and exhibits low volatility, making it ideal for applications involving high processing temperatures or exposure to moisture. Its excellent hydrolytic stability is another significant advantage, ensuring its efficacy even in challenging environments.

The primary role of Phosphite Antioxidant 168 in polymer processing is to act as a process stabilizer. During extrusion, injection molding, or other thermal processing techniques, polymers are subjected to heat and shear, which can initiate oxidation. Phosphite Antioxidant 168 effectively neutralizes the hydroperoxides formed during these stages, preventing chain scission, cross-linking, and the formation of undesirable byproducts that can lead to embrittlement and discoloration. Its compatibility with a broad spectrum of polymers, including polyolefins (polypropylene, polyethylene), ABS, polycarbonate, PVC, polyesters, and more, makes it a versatile choice for manufacturers across various sectors.

Beyond processing stability, phosphite antioxidants also contribute to the overall long-term thermal stability of the finished product. They work synergistically with primary antioxidants to provide a comprehensive protection package against degradation. This dual action is essential for extending the service life of polymer products, ensuring they retain their mechanical properties and aesthetic appeal over time. For businesses looking to buy reliable polymer additives that enhance both processing efficiency and end-product quality, investing in high-performance phosphites like Phosphite Antioxidant 168 from NINGBO INNO PHARMCHEM CO.,LTD. is a prudent decision. Our commitment to quality assurance and technical support ensures that our clients receive not just chemicals, but effective solutions for their material challenges.