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Specifications
| Appearance: | Colorless and transparent liquid |
| APHA Color: | 50 max |
| Specific Gravity (25℃): | 0.942 to 0.952 g/cm³ |
| Refractive Index: | 1.4770 to 1.4820 |
| Acid Value: | 0.1 mg KOH/g max |
Applications
1. Plastic Stabilizer (Antioxidant)
Diisodecyl phenyl phosphite is extensively used as a secondary antioxidant in the processing of polymers like:
Polyolefins (e.g., polypropylene, polyethylene)
PVC (polyvinyl chloride)
ABS and other engineering plastics
It helps protect polymers against thermal degradation during high-temperature processing (extrusion, molding, etc.) by decomposing hydroperoxides into non-radical, stable products.
2. Synergist with Primary Antioxidants
It is often blended with primary antioxidants such as hindered phenols (e.g., BHT, Irganox 1010) to achieve synergistic stabilization of polymers, extending their shelf life and enhancing processability.
3. Lubricants and Industrial Oils
Due to its thermal and oxidative resistance, DIDP phosphite is also used in certain lubricants and hydraulic fluids to prevent oxidation and prolong functional performance.
4. Polyurethane and Rubber Applications
It finds niche usage in the stabilization of polyurethanes and elastomers, especially those exposed to heat and oxygen over time.
Benefits
Thermal Stability: Withstands high temperatures, making it suitable for extrusion and molding processes.
Hydrolytic Resistance: More stable to hydrolysis compared to other phosphites, which is essential in moist or humid environments.
Improves Color Retention: Helps in maintaining product clarity and preventing discoloration (yellowing) during polymer processing.
Liquid Form: Easily blendable with other additives or masterbatches without requiring pre-dissolution or melting.
Compatibility: Works well with a wide range of polymer systems and additive formulations.
Conclusion
Diisodecyl phenyl phosphite (CAS 25550-98-5) is a highly effective secondary antioxidant and processing stabilizer used primarily in polymer and plastic manufacturing. Its ability to decompose hydroperoxides, improve thermal resistance, and maintain product clarity makes it an essential additive in modern plastic formulations. Additionally, its hydrolytic stability and compatibility with a broad spectrum of materials make it a preferred choice for high-performance and durable applications in the plastics and lubricants industries.
