The Effect of Zinc Oxide on the Peroxide Vulcanisation of Skf-32 Fluorine-Containing Rubber

The Influence of the Nature of the Metal Oxide on the Process of Peroxide Vulcanisation of SKF-32 Fluorine-Containing Rubber

“…Reduction in the degree of crosslinking of the elastomers in the case of using DCP was also observed during the vulcanisation of rubber SKF-32 in the presence of zinc oxide [1]. This is possibly a consequence both of the increased peroxide content on the surface of the mineral support, which is inaccessible for the reaction of crosslinking of macromolecules on account of the adsorption activity of the mineral support (fine colloidal silica), and/or the process of pronounced degradation of the rubber macromolecules.…”

“…Common to all the peroxides examined when present in a quantity of less than 0.06 parts (in terms of the pure substance) is an intense linear increase in the degree of crosslinking of vulcanisates produced at 160°C. Here, the effectiveness of the organic peroxides during crosslinking of macromolecules of SKF-32 rubber in the presence of magnesium oxide is considerably higher then when zinc oxide is used [1], and at 160°C it increases in the following order: Novoperox BP-40 > DCP ≈ DCP-1 > TBC > CHP > CHP-1 ( Figure 1).…”

“…However, with respect to the degree of crosslinking of the vulcanisates that can be achieved, for example, at 170°C in the presence of magnesium oxide, the peroxides are ordered differently: Novoperox BP-40 > TBC > DCP > CHP >> CHP-1 (Figure 2), i.e. in this case also the order of the effectiveness of crosslinking of rubber macromolecules by peroxides is different to the case of using zinc oxide [1]. This order of peroxide activity is also retained at 160°C according to data on the increase in torque for rubber mixes based on rubber SKF-32 ( Table 1).…”

“…In terms of the effectiveness of crosslinking of macromolecules of rubber SKF-32 in the presence of zinc oxide at 160°C, these peroxides are ordered differently: DCP-1 > DCP > Novoperox BP-40 > CHP > TBC [1].…”

“…With increase in the vulcanisation temperature of the rubber to 170°C, the order of effectiveness of the organic peroxides during the crosslinking of macromolecules of rubber SKF-32 is retained when magnesium oxide is used, but changes slightly in the case of zinc oxide [1]. However, with respect to the degree of crosslinking of the vulcanisates that can be achieved, for example, at 170°C in the presence of magnesium oxide, the peroxides are ordered differently: Novoperox BP-40 > TBC > DCP > CHP >> CHP-1 (Figure 2), i.e.…”