In the realm of rubber chemistry, guanidine accelerators form a vital class of compounds that significantly influence the vulcanization process and the final properties of rubber products. Among these, Di-o-tolylguanidine (DOTG) and Diphenylguanidine (DPG) are two prominent members. While both serve similar functions, understanding their nuances is crucial for selecting the optimal accelerator for a specific application. This article compares DOTG and DPG, helping procurement managers and formulators make informed purchasing decisions, especially when considering sourcing from international manufacturers.

Understanding Guanidine Accelerators

Guanidine accelerators are known for their moderate to slow-acting nature, often used as secondary accelerators to boost the activity of faster primary accelerators like thiazoles and sulfenamides. They typically offer good scorch safety and can contribute to improved tensile strength and modulus in vulcanized rubber.

Di-o-tolylguanidine (DOTG) - CAS 97-39-2

  • Activity and Scorch Safety: DOTG is generally considered to be more active than DPG. Crucially, it operates at lower temperatures and offers very safe processing with a low risk of scorching. Its critical temperature is around 141°C, meaning it becomes highly active at vulcanization temperatures but remains stable below this.
  • Applications: DOTG is particularly suited for thick-walled products, tire treads, and buffer layers where consistent and deep cure is required. Its safety profile makes it a preferred choice for demanding applications.
  • Synergy: It works exceptionally well as a booster for thiazoles, thiurams, and sulfonamides, enhancing their performance.

Diphenylguanidine (DPG) - CAS 102-06-7

  • Activity and Scorch Safety: DPG is a widely used, cost-effective accelerator. It is moderately active and provides a decent level of scorch safety, though generally less so than DOTG at equivalent concentrations.
  • Applications: DPG is used in a broad range of rubber products, including tires, tubes, and footwear. It's often chosen for its balance of performance and cost.
  • Synergy: Similar to DOTG, DPG is frequently used with other accelerators to activate them and improve cure rates.

Key Differences and Selection Criteria

The primary distinction between DOTG and DPG often comes down to:

  • Processing Temperature and Safety: If low operating temperature and maximum scorch safety are paramount, DOTG is typically the preferred choice.
  • Activity Level: DOTG often offers a slightly higher level of acceleration, especially when combined with other accelerators.
  • Cost: DPG is often more economically priced, making it a strong contender for cost-sensitive applications where its performance profile is adequate.
  • Productivity: For manufacturers in China and globally, the consistent quality and dust-free forms offered by suppliers of both DOTG and DPG can impact ease of handling and overall production efficiency.

Sourcing DOTG and DPG from China

When looking to purchase either DOTG or DPG, Chinese manufacturers offer competitive pricing and diverse product forms. As a leading supplier, we provide both DOTG and DPG, ensuring high purity, reliable quality, and excellent customer service. Whether your application demands the superior safety of DOTG or the cost-effectiveness of DPG, we can supply the precise accelerator you need to optimize your rubber manufacturing processes.

Contact us to discuss your specific requirements and to get a quote for DOTG or DPG. Let us help you choose the best accelerator for your next project.