EPPD, also known as a mixture of N-(1.3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (6PPD) and N-(1.4-dimethylpentyl)-N'-phenyl-p-phenylenediamine (7PPD), is a high-performance antioxidant and anti-ozonant widely used in the rubber industry. This article provides a comprehensive overview of its chemical properties, applications, and safety considerations.

Chemical Properties

EPPD is a mixture of two compounds, 6PPD and 7PPD, which provide excellent static ozone resistance and improved flexural fatigue resistance in rubber products. This combination ensures high performance in various rubber applications.

Performance

Static Ozone Resistance: EPPD exhibits superior static ozone resistance, making it ideal for applications where long-term ozone protection is required.

Flexural Fatigue Improvement: It enhances the resistance to flexural fatigue, improving the durability of rubber products.

Ease of Use: The mixture with carbon black makes EPPD easy to weigh and disperse in rubber formulations.

Applications

Tire Manufacturing: EPPD is used in tire treads and sidewalls to improve static ozone resistance.

Outdoor Rubber Products: Suitable for wires & cables, rubber pipes, and other outdoor rubber products that require long-term static ozone protection.

High-Performance Rubber Products: EPPD can be used alone or in combination with other antioxidants like IPPD and 6PPD to enhance dynamic ozone resistance and flexural fatigue properties.

Packaging and Transportation

Packaging: EPPD is typically packaged in galvanized iron drums, with each drum weighing 200 kg.

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

Safety and Handling

EPPD 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

EPPD (6PPD+7PPD) is a versatile and high-performance chemical compound with a wide range of applications in the rubber industry. Its improved properties, such as reduced odor and volatile organic compounds (VOCs), make it particularly suitable for products with higher environmental and performance standards. Proper handling and safety measures are crucial to ensure its safe and effective use.