Rubber Accelerator DPG (D): Properties, Applications, and Market Insights

Introduction

Rubber Accelerator DPG, also known as Diphenyl Guanidine (DPG or Accelerator D), is a secondary accelerator widely used in the rubber industry. It plays an important role in enhancing vulcanization efficiency, improving mechanical properties, and optimizing production processes for natural and synthetic rubbers.

Chemical Profile of DPG

• Chemical Name: Diphenyl Guanidine

• CAS Number: 102-06-7

  Molecular Formula: C₁₃H₁₃N₃

• Appearance: White or light gray crystalline powder

• Melting Point: ~145–150°C

• Solubility: Slightly soluble in water, soluble in alcohol and acetone

Role in Rubber Vulcanization

Rubber Accelerator DPG is typically used as a secondary accelerator in combination with primary thiazole accelerators such as MBT (2-Mercaptobenzothiazole) or MBTS (Dibenzothiazyl disulfide). Its main functions include:

• Activation: Enhances the speed and efficiency of thiazole accelerators.

• Processing Safety: Provides a longer scorch time, reducing the risk of premature vulcanization.

• Performance Improvement: Enhances tensile strength, modulus, and resilience of vulcanized rubber.

• Versatility: Suitable for both natural rubber (NR) and synthetic rubbers like SBR, NBR, and EPDM.

Key Applications

1. Tires and Tubes

• Improves heat resistance and elasticity.

• Extensively used in passenger car and truck tires.

2. Industrial Rubber Products

• Applied in conveyor belts, hoses, seals, and gaskets.

• Ensures long service life and durability under harsh conditions.

3. Footwear and General Rubber Goods

• Enhances wear resistance and mechanical stability.

• Commonly used in shoe soles, sports equipment, and molded goods.

Advantages of Using DPG

• Strong synergistic effect with MBT/MBTS, leading to faster vulcanization.

• Excellent aging resistance in finished products.

• Good dispersion in rubber compounds.

• Cost-effective due to high efficiency at relatively low dosage levels.

Handling and Safety Considerations

Although DPG is effective in rubber compounding, proper handling is crucial:

• Avoid direct skin and eye contact; use protective gloves and goggles.

• Ensure adequate ventilation in the workplace.

• Store in a cool, dry, and well-ventilated place, away from strong oxidizing agents.

• Follow local safety regulations and material safety data guidelines.

Market Outlook

The global demand for Rubber Accelerator DPG continues to grow, supported by:

• Rising tire production in Asia-Pacific, especially China and India.

• Expanding applications in industrial rubber goods.

• Increasing demand for synthetic rubbers in automotive and construction sectors.

Future trends indicate a shift toward safer and eco-friendly accelerators, but DPG remains an important additive due to its cost-performance balance and compatibility with various rubber systems.

Conclusion

Rubber Accelerator DPG (D) is a critical secondary accelerator in rubber vulcanization, valued for its ability to boost efficiency, improve mechanical performance, and provide processing safety. With wide applications in tires, industrial products, and general rubber goods, it continues to play a vital role in the global rubber industry. As markets evolve, DPG’s importance will remain strong, especially in regions with high automotive and industrial demand.