What is accelerator in rubber vulcanization?

An accelerator is defined as the chemical added into a rubber compound to increase the speed of vulcanization and to permit vulcanization to proceed at lower temperature and with greater efficiency. Accelerator also Decreases the Quantity of Sulphur necessary for vulcanization and thus improving 'aged' properties of the rubber vulcanizates.

Who is PMC rubber chemicals?

PMC Rubber Chemicals is a state of the art developer, producer and marketer of rubber chemicals offering a comprehensive range of products including accelerators, antioxidants, antiozonants, retarders, and peptizers. Our well-known trademarks Accicure, Accinox, Accitard and Accimel which have been workhorses of the global industry for decades.

How is rubber vulcanized?

Vulcanization of rubbers by sulfur alone is an extremely slow and inefficient process. The chemical reaction between sulfur and the Rubber Hydrocarbon occurs mainly at the C = C (double bonds) and each crosslink requires 40 to 55 sulphur atoms (in the absence of accelerator).

Which accelerator is used for vulcanization?

The basic accelerators such as Guanidines, Thiurams, and Dithiocarbamates etc are used as Secondary accelerators to activate the primary accelerators. The use of secondary accelerators increases the speed of vulcanization substantially but at the expense of scorch safety.

Why are thiazoles and sulfenamide accelerators important?

Generally, Thiazoles and Sulfenamide accelerators play a role of being Primary Accelerators due to their characteristics such as good processing safety, a broad vulcanization plateau and optimum cross link density as well as desired reversion delay that they offer.

What is a thiazole accelerator?

This class of accelerators include commercially available and widely used accelerators such as MBT, MBTS and ZMBT (NaMBT the sodium salt of MBT also finds applications in few latex goods manufacture). Thiazoles are medium-fast primary accelerators with only moderate processing safety.