Introduction to 6PPD-L (CAS 793-24-8)

6PPD-L, also known as N-(1.3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, is a specialized chemical compound used primarily 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

6PPD-L is a grey purple to purplish brown solid with a melting point of 45-46°C and a boiling point of 260°C. It is insoluble in water but readily soluble in organic solvents such as benzene, acetone, and toluene. When exposed to air, 6PPD-L can darken in color, but this does not affect its efficacy.

Performance

Odor and VOC Reduction: 6PPD-L is an improved version of 6PPD, with significantly less odor and volatile organic compounds (VOCs). It is less volatile compared to 6PPD, effectively reducing the odor of rubber compounds and final products.

Antioxidant and Anti-Ozonant Properties: 6PPD-L provides excellent protection against thermal and oxidative degradation, as well as ozone cracking and flex fatigue in rubber products.

Applications

Rubber Products: 6PPD-L is used in the production of various rubber products, including tires, conveyor belts, and rubber hoses, where it enhances durability and resistance to environmental factors.

Plastics: It is also used as a stabilizer in plastics like polyethylene and polypropylene to prevent thermal and oxidative degradation.

Packaging and Transportation

Packaging: 6PPD-L is typically packaged in paper/plastic bags with a net weight of 25 kg per package.

Transportation Conditions: It should be transported in clean, covered vehicles, avoiding direct sunlight, rain, and long-term compression. It should also be kept away from heat sources.

Safety and Handling

6PPD-L is classified as a hazardous substance with the following hazard statements:

H302: Harmful if swallowed.

H315: Causes skin irritation.

H319: Causes serious eye irritation.

H410: Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.

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.

Environmental Considerations

6PPD-L can transform into 6PPD-quinone when it reacts with ozone. This byproduct has been detected in waterways and is under scrutiny for its potential ecological impact. Proper storage and disposal practices are essential to minimize environmental exposure.

Conclusion

6PPD-L 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 odor and VOCs, make it particularly suitable for products with higher environmental and performance standards. However, due to environmental concerns related to its byproducts, ongoing research and regulatory attention are focused on optimizing its use and mitigating potential impacts.