What are thiazoles used for?

Thiazoles are primary accelerators with a medium-fast curing rate and moderate processing safety. They are extensively employed in the rubber industry for the production of various goods like cycle tires, footwear, beltings, hoses, and molded/extruded products.

What are thiazole accelerators?

Thiazole accelerators are activated by a combination of Zinc oxide and Stearic acid, resulting in a flat cure and vulcanizates with excellent resistance to reversion. The activity of thiazole accelerators can be summarized as follows: Scorch Safety: Thiazoles offer longer scorch safety compared to (MBT < MBTS < ZMBT).

Are thiazoles a cure retarder?

Cure Rate: Thiazoles provide faster cure rates, with (ZMBT < MBTS < MBT). Crosslink Density: Thiazoles exhibit higher crosslink density at equal dosage, with (ZMBT < MBT < MBTS). Thiazoles act as cure retarders when used in rubber compounds accelerated by Thiurams (TMTD/TMTM)/Dithiocarbamates (ZDC, ZDBC), or ETU class accelerators.

Do thiazoles have a high crosslink density?

Crosslink Density: Thiazoles exhibit higher crosslink density at equal dosage, with (ZMBT < MBT < MBTS). Thiazoles act as cure retarders when used in rubber compounds accelerated by Thiurams (TMTD/TMTM)/Dithiocarbamates (ZDC, ZDBC), or ETU class accelerators. They also help reduce bloom of Thiurams and dithiocarbamates in EV cure systems.

Can thiazole accelerators be retarded?

Conversely, thiazole accelerators can be retarded by incorporating small proportions of retarders such as Pilgard PVI, NDPA, phthalic anhydride, salicylic acid, etc. Additionally, adding extra Stearic acid or partially replacing it with sulphenamide accelerators can help control scorching to some extent.

Are thiurams a vulcanizing agent?

When used as vulcanizing agents (2.5 – 3.0 phr) in the absence of sulfur, thiurams contribute to vulcanizates with a high degree of cure, resulting in enhanced tensile strength, modulus, reduced elongation at break, improved rebound resilience at elevated temperatures, and lower tear resistance.