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.

Which accelerator is most commonly used in rubber industry?

most commonly used by the Rubber Industry.There is a wide variety o accelerators available to the compounder. For ease in understanding, it is useful to c assify accelerators by chemical structure. One such classifi ation, made by the ASTM s as follows: 1 Thiazoles (Me capto), 2. Sulfenami es, 3. Guani ines, 4. Dithiocarbamat

How many accelerators are used in rubber vulcanizates?

r temperature and with greater efficiency. Over 150 different chemicals belonging to different classes of composition are known to function as acceler-ators for rubber vulcanizates of which around 50 accelerators are most commonly used by the Rubber Industry.There is a wide variety o

What is the role of accelerator in vulcanization?

Accelerator also Decreases the Quantity of Sulphur necessary for vulcanization and thus improving 'aged' properties of the rubber vulcanizates. Accelerators are also classified as Primary and / or Secondary accelerators based on the role they play in a given compound.

What is the mechanism of rubber vulcanization with sulfur?

Many studies have been carried out to understand the mechanism of rubber vulcanization with sulfur in the presence of accelerators and activators. Vulcanization is the phenomenon of formation of cross links with rubber macromolecules.

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).