4-Aminodiphenylamine (4-ADPA) is a high-performance chemical compound widely used as an antioxidant and anti-ozonant in the rubber industry. This article provides a comprehensive overview of its chemical properties, applications, and safety considerations.

Chemical Properties

4-Aminodiphenylamine (4-ADPA) is a white crystalline powder with a melting point of 115-117°C and a boiling point of 250-252°C. It is slightly soluble in water but readily soluble in organic solvents such as benzene, acetone, and toluene. Its chemical structure consists of two phenyl rings linked by an amine group, providing it with unique stabilizing properties.

Performance

Antioxidant and Anti-Ozonant: 4-ADPA is an effective antioxidant and anti-ozonant, providing excellent protection against thermal and oxidative degradation.

Low Volatility: It has low volatility and minimal odor, making it suitable for use in various rubber formulations.

Compatibility: 4-ADPA is compatible with a wide range of rubber types, including natural rubber (NR), styrene-butadiene rubber (SBR), and nitrile rubber (NBR).

Applications

Tires: 4-ADPA is widely used in tire manufacturing, particularly in tire treads and sidewalls, to improve static ozone resistance and flexural fatigue resistance.

Rubber Products: It is used in various rubber products such as hoses, belts, and seals to enhance their durability and resistance to environmental factors.

Plastics: 4-ADPA can also be used as a stabilizer in plastics to prevent thermal and oxidative degradation.

Packaging and Storage

4-ADPA is typically packaged in paper/plastic bags with a net weight of 25 kg per package. It should be stored in a cool, dry place with good ventilation, avoiding direct sunlight and moisture. The product has a shelf life of one year when stored properly.

Safety and Handling

4-ADPA is classified as a hazardous substance with the following hazard statements:

H302: Harmful if swallowed.

H315: Causes skin irritation.

H319: Causes serious eye irritation.

Precautionary Statements:

P261: Avoid breathing dust/fume/gas/mist/vapors/spray.

P280: Wear protective gloves/protective clothing/eye protection/face protection.

P305 + P351 + P338: If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing.

P333 + P313: If skin irritation or rash occurs: Get medical advice/attention.

Conclusion

4-Aminodiphenylamine (4-ADPA) is a versatile and high-performance chemical compound with a wide range of applications in the rubber and plastics industries. Its improved properties, such as reduced volatility and excellent antioxidant and anti-ozonant performance, make it particularly suitable for products requiring high performance and durability. Proper handling and storage are essential to ensure its safe and effective use.