Accelerators and Vulcanization Agents
Vulcanization is the name originally given to the process Charles Goodyear discovered by mixing sulfur with natural rubber and subjecting it to heat to transform a plastic substance into an elastic substance. Years later it was learned that the sulfur actually crosslinks the chains of the rubber molecules. Eventually chemicals other than sulfur were used to crosslink elastomers, resulting in the term crosslinking to become synonymous with vulcanization. Vulcanization is normally achieved with time and temperature activation of specific chemicals which react with polymeric materials, producing a crosslinked network of molecular chains with visco-elastic properties. Sulfur-bearing accelerators make the sulfur-vulcanization process safer and more efficient. Crosslinking is also achieved by organic peroxides, which may be made more efficient thru the use of coagents.
BUTYL ZIMATE® Rubber Accelerator and Antioxidant
Rubbers with low unsaturation such as EPDM require very active accelerators. BUTYL ZIMATE® promotes fast cures with good aging and is the least blooming of the zinc dithiocarbamates. Up to 3 phr can be used in many compounds without bloom problems.
VANAX® 829 Accelerator
Crosslinking agent for polyacrylate elastomers. Provides better initial elongation than trifunctional triazines without sacrificing resistance to compression set.
VANAX® 107 Pastilles Accelerator
VANAX 107 Pastilles is a proprietary accelerator that replaces DOTG, targeting its use in high performance acrylic based elastomers, such as Vamac® Ethylene Acrylic Elastomer (AEM) and Hytemp® (ACM) polyacrylate elastomers. VANAX 107 Pastilles may also replace DOTG in zinc oxide-cured Neoprene and sulfur-cured Natural Rubber.