RAW MATERIALS AND APPLICATIONS Analyses on chemical Compatibility and Diffusion behavior of Accelerators in Rubber Matrices

Von Jannik Laages, Ulrich Giese, Hannover, Germany 0 min Lesedauer

For effective sulfur vulcanization, accelerators, sulfur and activators such as zinc oxide and fatty acids are used. Common accelerators often show incompatibilities due to low solubility in the rubber.

Left: NR 10 phr ZBEC after mixing (no blooming), right: NR 10 phr ZBEC after heating to 180 °C for 2 minutes with strong blooming after cooling.(Bild:)
Left: NR 10 phr ZBEC after mixing (no blooming), right: NR 10 phr ZBEC after heating to 180 °C for 2 minutes with strong blooming after cooling.
(Bild:)

Elastomers are produced by chemical wide-mesh crosslinking (vulcanization) of polymers, usually highly viscous rubbers. The crosslinking density and the network node structures contribute significantly to the physical and chemical properties of the elastomer, such as elasticity, elongation at break, breaking strength, hardness or also the permanent deformation after the action of an external force.