Rubber Accelerator

Rubber accelerator including the cbs in rubber compounding is a chemical that is applied to a rubber compound to speed up vulcanization and allow vulcanization to occur at lower temperatures and with greater efficiency. Accelerator in rubber compounding also reduces the amount of sulfur required for vulcanization, increasing the "aged" qualities of the rubber vulcanizate.

These rubber additives are further subdivided into Primary and Secondary accelerators for rubber vulcanization based on their involvement in a certain compound. Thiazoles and Sulfenamide accelerators, in general, play the role of Primary accelerators in rubber compounding due to their properties such as good processing safety, a broad vulcanization plateau, optimal cross link density, and desired reversion latency. Most rubber compounds employ 0.5 to 1.5 phr doses of Primary Accelerators. Secondary accelerators for rubber vulcanization, such as guanidines, thiurams, and dithiocarbamates, are employed to activate the primary accelerators. Secondary accelerators in rubber compounding significantly boost vulcanization speed at the expense of scorch safety. Secondary accelerator dosages are typically 10-40% of the primary accelerator dosage.

Accelerators are chemical additives used in rubber compounding to speed up the vulcanization process. Vulcanization rubber accelerator promote the formation of cross-links between rubber polymer chains, enhancing the mechanical properties of the final product. 

Common vulcanization rubber accelerators include Mercaptobenzothiazole (MBT), N-Cyclohexyl-2-benzothiazolesulfenamide (CBS accelerator), and Dibenzothiazyl disulfide (MBTS accelerator). Accelerator selection for rubber vulcanization depends on the rubber type, desired properties, and processing conditions. Proper control of accelerator levels in rubber compounding is crucial to prevent over-curing or scorching, ensuring optimal performance and durability in the cured rubber.