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| Name | Exterior view | Chemical composition | Complex carrier | Characteristics |
|---|---|---|---|---|
| First TiBTD-75 |  |
Chemical composition: Tetrakis(isobutylthio)guanidine | Complex carrier: EPDM | Characteristics: Accelerator suitable for NR, IR, BR, SBR, IIR, NBR, and EPDM; exhibits no rubber staining, is easy to weigh and disperse, and leaves no contamination behind. Its performance closely resembles that of TT and TETD, while also ensuring nitrosamine-free vulcanization. It delivers excellent curing properties yet maintains low tensile strength. Even in sulfur-free formulations, it still provides strong vulcanization effects, along with superior heat resistance and zero foaming characteristics, resulting in products that are highly resistant to compression. |
| First TBTD-50 |  |
Chemical composition: Tetrabutyl tetrahydrothiuram disulfide | Complex carrier: EPDM | Characteristics: Used as a superaccelerator in both natural and synthetic rubber; the optimal vulcanization temperature ranges from 95 to 110°C, with high solubility in the rubber compound. When used in combination with TMTD, it helps minimize frosting while maintaining normal vulcanization activity. Additionally, TBTD boasts an effective sulfur content of approximately 7.5%, making it suitable as a curing agent in sulfur-based vulcanization systems. |
| First TETD-75 |  |
Chemical composition: Tetraethyl thiuram disulfide | Complex carrier: EPDM | Characteristics: Used as a superaccelerator in both natural and synthetic rubber; TETD offers better scorch safety compared to TMTD and is widely applied in rubber injection-molding products. It is commonly employed as an auxiliary accelerator for thiazole, guanidine, and aldimine-based accelerators. With an effective sulfur content of approximately 8.25%, TETD can also serve as a vulcanizing agent in sulfur-curing systems. When used in combination with TMTD, TETD helps minimize frosting while maintaining optimal vulcanization activity. |
| First TBzTD-75 |  |
Chemical composition: Tetrabenzyl tetraurea | Complex carrier: EPDM | Characteristics: Fast-acting vulcanization accelerators and sulfur carriers in both natural and synthetic rubber are primarily used as a replacement for TMTD. During the vulcanization process, they do not generate or release carcinogenic nitrosamine compounds, thereby complying with Germany’s "Technical Rules for Hazardous Substances" TRGS 552 regarding nitrosamine toxicity. TBzTD-75GE offers a longer scorch time compared to TMTD-75GE. It is occasionally employed as a PVC rubber vulcanization inhibitor. Additionally, TBzTD-75 can serve as a delayed-action agent when used alongside ETU-75 in mercaptan-modulated chloroprene rubber compounds. |
| First TMTD (TT)-75 |  |
Chemical composition: Tetramethylthiuram disulfide | Complex carrier: EPDM | Characteristics: Acts as a superaccelerator for both natural and synthetic rubber; features an effective sulfur content of approximately 9.98%, making it suitable for use as a vulcanizing agent in low-sulfur and EV systems. It exhibits a critical vulcanization temperature of 100°C and is commonly employed—either as a primary or secondary accelerator—in diene rubbers such as NR, SBR, IR, BR, and NBR, often combined with CTP to enhance scorch safety in the compound. When used as a primary accelerator, it must be paired with zinc oxide and stearic acid; alternatively, it frequently serves as a secondary accelerator alongside thiazole-based accelerators. Additionally, it can be integrated into continuous vulcanization systems when combined with other accelerators. It also functions as a scorch retardant for non-sulfur-modified chloroprene rubber (CR). |
| First TMTM(TS)-80 |  |
Chemical composition: Tetramethylthiuram monosulfide | Complex carrier: EPDM | Characteristics: Used as an ultrafast vulcanization accelerator in both natural and synthetic rubber; its critical vulcanization temperature is approximately 121°C, and it exhibits about 10% lower vulcanization activity compared to TMTD, while offering excellent scorch safety. Additionally, it imparts outstanding anti-aging performance in low-sulfur vulcanized products. It can be used alone, though its activity can be enhanced when combined with guanidine or aldehyde-amine compounds. Typically, it serves as a secondary accelerator alongside thiazoles and sulfonamides. It is also suitable for use as a scorch-delaying agent in non-sulfur-modified chloroprene rubber (CR). |
| 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. |
| First TBSI-75 |  |
Chemical composition: N-tert-Butyl-bis(2-benzothiazolyl) sulfenimide | Complex carrier: EPDM/SBR | Characteristics: Natural rubber and synthetic rubber's post-curing, eco-friendly accelerators—particularly suited for carbon black compounds with high alkalinity—offer excellent scorch resistance, ensuring safe handling even at elevated temperatures. They also promote faster vulcanization while maintaining outstanding resistance to reduction. These accelerators can effectively replace the TBBS + PVI system in large-scale, thick natural rubber products. With their high molecular weight, elevated melting point, and superior thermal stability, they remain stable even when exposed to water. Additionally, they enhance the heat resistance and durability of steel cord-to-rubber adhesion, making them an ideal choice for demanding applications. |
| First DCBS (DZ)-80 |  |
Chemical composition: N,N-Dicyclohexyl-2-benzothiazole sulfenamide | Complex carrier: EPDM/SBR | Characteristics: Sulfenamide accelerators for both natural and synthetic rubber; compared to CBS, DCBS offers superior scorch resistance, higher molecular weight, enhanced structural stability, greater thermal decomposition resistance at room temperature, reduced environmental impact, and lower odor. Additionally, vulcanized products exhibit outstanding adhesion properties when in contact with metals such as brass. |
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