Alkylated Diphenylamine (ADPA) Antioxidant
CAS Number: 68411-46-1
Alkylated diphenylamine (ADPA) is a high-performance secondary aminic antioxidant produced by alkylating diphenylamine with olefins to improve oil solubility and reduce volatility compared to unalkylated DPA. ADPA provides superior high-temperature oxidation protection and is particularly effective in modern engine oils, aviation turbine oils, and high-temperature industrial lubricants. The C4–C9 alkyl substituents dramatically improve oil compatibility without sacrificing radical-scavenging activity.
Technical Specifications
| acid value | <1.0 mg KOH/g |
| appearance | Dark red to dark amber liquid |
| nitrogen content | 3.8–4.5 wt% |
| flash point (COC) | >180 °C |
| kinematic viscosity (100°C) | 10–50 mm²/s |
| RBOT oxidation life (ASTM D2272) | >300 min at 1% treat rate |
Applications
- High-performance engine oils (API SP/SN Plus, ACEA A3/B4/C3)
- Aviation turbine oils meeting MIL-PRF-23699F and DEF STAN 91-097
- High-temperature compressor and vacuum pump oils
- Premium industrial gear and hydraulic oils requiring oxidative stability
- Synthetic PAO and ester-based lubricant formulations
Key Features
- Improved oil solubility and low volatility versus unalkylated DPA for reduced evaporative loss
- Excellent performance at extreme temperatures (up to 200°C) in aviation and industrial turbine applications
- Strong synergy with hindered phenolic antioxidants and ZDDP for comprehensive engine oil antioxidation
- Low color impact on finished lubricant: preferred for premium light-colored oil formulations
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CAS Number
68411-46-1
Category
Automotive Lubricant AdditivesAvailability
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