In the dynamic world of polymer manufacturing, maintaining the integrity and longevity of plastic materials is paramount. Manufacturers constantly seek innovative solutions to protect their products from the detrimental effects of heat, oxygen, and mechanical stress during processing. Among the most vital components in achieving this protection is a class of chemicals known as antioxidants. One particularly effective and widely utilized compound is Antioxidant 168, a secondary antioxidant that plays a critical role in modern polymer processing.

Antioxidant 168, chemically known as Tris(2,4-di-tert-butylphenyl)phosphite and identified by CAS number 31570-04-4, is a phosphite ester antioxidant. Its primary function is to act as a hydroperoxide decomposer. During the thermal processing of polymers, such as extrusion or injection molding, oxidative degradation can occur, leading to the formation of harmful hydroperoxides. Antioxidant 168 effectively neutralizes these hydroperoxides, thereby preventing the initiation of chain reactions that would otherwise lead to polymer chain scission, crosslinking, and ultimately, a loss of mechanical properties and discoloration, commonly known as yellowing.

The benefits of incorporating Antioxidant 168 into polymer formulations are numerous. Firstly, it offers excellent thermal stability. This means it can withstand the high temperatures involved in polymer processing without significant decomposition itself, ensuring continuous protection. Secondly, it exhibits low volatility. This characteristic is crucial because it minimizes the loss of the additive through evaporation during processing, ensuring that the desired concentration remains in the final product. This leads to more consistent and reliable performance.

One of the most significant advantages of Antioxidant 168 is its synergistic effect when used in conjunction with primary antioxidants, such as hindered phenols like Antioxidant 1010 or 1076. While primary antioxidants scavenge free radicals directly, secondary antioxidants like Antioxidant 168 work by decomposing hydroperoxides. This complementary action creates a powerful dual-protection system, offering superior long-term stability and resistance to degradation compared to using either type of antioxidant alone. This synergy is key for achieving optimal performance in demanding applications.

The versatility of Antioxidant 168 is demonstrated by its compatibility with a wide array of polymers. It is extensively used in polyolefins, including polyethylene (HDPE, LLDPE) and polypropylene (PP), as well as in engineering plastics such as polycarbonate (PC), polyamide (PA), ABS, and PMMA. Furthermore, it finds application in elastomers, synthetic fibers, adhesives, and coatings. Its ability to prevent plastic yellowing and maintain physical properties makes it an ideal choice for products where aesthetics and long-term performance are critical.

For manufacturers aiming to enhance the durability and processing efficiency of their polymer products, understanding the role and benefits of Antioxidant 168 is essential. By effectively inhibiting oxidation and working synergistically with other stabilizers, it contributes significantly to extending the service life of plastic goods, thereby reducing waste and improving overall product quality. NINGBO INNO PHARMCHEM CO.,LTD. is committed to providing high-quality chemical solutions that meet the evolving needs of the polymer industry, and Antioxidant 168 stands as a testament to this commitment.