Polyolefins, such as polyethylene (PE) and polypropylene (PP), are among the most widely used plastics globally, owing to their versatility, cost-effectiveness, and good mechanical properties. However, these polymers are inherently susceptible to degradation during the high-temperature processing stages required for their fabrication. This is where effective stabilizers, like Antioxidant 168 (CAS 31570-04-4), play a crucial role.

Antioxidant 168 is a phosphite ester antioxidant that acts as a secondary stabilizer. Its primary mechanism involves decomposing hydroperoxides, which are key intermediates in the oxidative degradation of polymers. During processes like extrusion and injection molding, heat and shear can generate free radicals within the polyolefin chains. These radicals react with oxygen to form hydroperoxides, which can then break down further, propagating a cascade of degradation reactions. Antioxidant 168 effectively intercepts these hydroperoxides, converting them into harmless alcohols, thereby preventing the escalation of polymer damage.

The benefits of using Antioxidant 168 in polyolefin processing are manifold:

  • Processing Stability: It significantly enhances the polymer's resistance to degradation during melt processing, preventing unwanted changes in molecular weight (chain scission or crosslinking) that can affect melt flow and mechanical properties.
  • Discoloration Prevention: Oxidative degradation often leads to yellowing or other color changes in polyolefins. Antioxidant 168 is highly effective in preventing this discoloration, ensuring the final product maintains its intended aesthetic appeal.
  • Low Volatility: Its low volatility means that the additive remains within the polymer matrix throughout the processing cycle, ensuring consistent and effective protection without significant loss.
  • Synergistic Effects: When combined with primary antioxidants, such as hindered phenols (e.g., Antioxidant 1010, 1076), Antioxidant 168 provides superior protection. This combination addresses degradation at multiple fronts – free radical scavenging and hydroperoxide decomposition – leading to enhanced overall stability and extended product lifespan.

The incorporation of Antioxidant 168 is vital for maintaining the integrity of polyolefins in various applications, including packaging films, automotive parts, pipes, and consumer goods. By safeguarding the polymer chains and preventing discoloration, it ensures that the final products meet performance specifications and consumer expectations.

NINGBO INNO PHARMCHEM CO.,LTD. is dedicated to supplying high-quality chemical additives that empower manufacturers to achieve optimal results. Our supply of Antioxidant 168 ensures that polyolefin processors have access to a reliable and effective stabilizer that contributes to the production of durable, aesthetically pleasing, and high-performing plastic products, directly supporting the drive for improved material performance and longevity in the industry.