Transcription of Vulcanization & Accelerators - Nocil
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Vulcanization & Accelerators - Nocil
1 Vulcanization & Accelerators Vulcanization is a cross linking process in which individual molecules of rubber (polymer) are converted into a three dimensional network of interconnected (polymer) chains through chemical cross links(of sulfur). The Vulcanization process was discovered in 1839 and the individuals responsible for this discovery were Charles Goodyear in USA and Thomas Hancock in England. Both discovered the use of Sulfur and White Lead as a Vulcanization system for Natural rubber . This discovery was a major technological breakthrough for the advancement of the world economy. 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 ).
Selection of Accelerators for Rubber Compounds : Before selecting an Accelerator system for the manufacture of a particular rubber product, following points have to be taken into account. Solubility in rubber (high solubility required to avoid bloom & improve dispersibility),
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