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| Name | Exterior view | Chemical composition | Complex carrier | Characteristics |
|---|---|---|---|---|
| First DOTG-75 |  |
Chemical composition: Di邻toluene guanidine | Complex carrier: EPDM/SBR/AEM | Characteristics: The activators and accelerators for both natural and synthetic rubbers are highly similar to D (diphenylguanidine); they exhibit very low reactivity at processing temperatures, making them safe to handle. Their critical vulcanization temperature is 141°C, but once the vulcanization temperature—especially above this critical point—is reached, they become highly reactive while maintaining excellent vulcanization flatness. This compound serves as a key activator for thiazole, thiuram, and sulfenamide accelerators, and when used in combination with Accelerator M, it delivers a synergistic "super-accelerator" effect. Additionally, it is commonly paired with HMDC in vulcanization systems such as acrylic esters and polyurethanes. |
| First DPG(D)-80 |  |
Chemical composition: Diphenylguanidine | Complex carrier: EPDM/SBR | Characteristics: A medium-speed accelerator commonly used for both natural and synthetic rubbers, it exhibits no vulcanization-promoting effect on IIR or EPDM but acts as a plasticizer and scorch inhibitor in CR. Its critical vulcanization temperature is 141°C, resulting in poor vulcanization flatness and relatively slow curing rates. However, the resulting rubber compound is highly safe to handle. When used alone, the cured rubber shows poor aging resistance, necessitating the addition of an antioxidant. It is frequently employed as an activator in thiazole, thiourea, and dithiocarbamate systems and, when combined with DM and TMTD, can be effectively utilized in continuous vulcanization processes. |
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