Accelerator DPG (Diphenylguanidine)
CAS Number: 102-06-7
Diphenylguanidine (DPG) is a slow-acting secondary accelerator widely used in combination with primary sulfenamide or thiazole accelerators to boost vulcanization rate and crosslink density. It is particularly valuable in silica-filled tire compounds as it acts as an activator for the silane coupling agent reaction, improving filler-polymer bonding. DPG provides good scorch safety and excellent aging resistance in cured compounds.
Technical Specifications
| ash (%) | ≤0.30 |
| appearance | White to off-white powder |
| purity (%) | ≥99.0 |
| moisture (%) | ≤0.30 |
| melting point (°C) | 145–148 |
| sieve residue (150μm, %) | ≤0.1 |
Applications
- Silica-filled tire tread compounds (green tire)
- Natural rubber and SBR tire compounds
- Industrial rubber goods requiring high crosslink density
- Ebonite and hard rubber compounds
- Chloroprene and EPDM blends
Key Features
- Effective secondary accelerator for sulfenamide systems
- Activates silane coupling in silica-filled green tire compounds
- Good scorch safety and processing safety
- Enhances crosslink density and heat resistance
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