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.

What is vulcanizing agent?

Vulcanizing agent is the most important ingredient in this system as it is used to strengthen the rubber compound properties through the vulcanization process. Normally, this process is conducted by heating the mixture of raw rubber with vulcanizing agents at specific vulcanization time in a pressurized mold.

What is vulcanization of rubber?

Vulcanization involves chemical procedure wherein rubber is blended with activators, accelerator, and Sulfur at the temperature of 140–160 °C (Fig. 4.6). Cross-linking occurs among long molecules of rubber, to add up the tensile strength, tenderness, and resilience toward weather . Fig. 4.6. Vulcanization of synthetic rubber .

Which vulcanizing agent is used in a rubber compound?

Three types of the vulcanizing agent are extensively used; the sulphur, insoluble sulphur, and peroxides. After all, sulphur is the most generic vulcanization agent as it is easily available, inexpensive and effectively enhanced the rubber compound (Chandrasekaran, 2007).

What is accelerated sulfur vulcanization?

The accelerated-sulfur vulcanization of these rubbers along with the vulcanization of other rubbers, which are vulcanized by closely related technology, comprises more than 90% of all vulcanization. These rubbers include ethylene-propylene-diene-monomer rubber (EPDM), butyl rubber (IIR), halobutyl rubbers, and nitrile rubber (NBR).

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.