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PусскийVulcanization of rubber is a chemical process that improves mechanical properties by cross-linking unsaturated polymer chains. Zinc oxide (ZnO) acts as an activator to facilitate sulfur vulcanization of rubber.
The following is the historical data of the rubber accelerators consulted to introduce to you
The use of alkaline compounds of metals as vulcanization accelerators was cited in the original patent of the vulcanization process, granted to Charles Goodyear in 1844; magnesium oxide, zinc oxide, and basic lead carbonate were used until early in the 20th century, when the superiority of aniline, an organic compound, was discovered. Despite its toxicity, aniline was used as an accelerator for several years. Thiocarbanilide, less poisonous than aniline, succeeded it as the most important accelerator until it was displaced by mercaptobenzothiazole (MBT) about 1925. Compounds related to MBT have proved especially useful in vulcanizing synthetic rubbers.
During vulcanization the accelerator apparently converts the sulfur into a compound that reacts more rapidly with rubber than does sulfur itself. An alternative possibility is that the accelerator reacts first with the rubber, changing it into a form that combines rapidly with sulfur.
