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ZnO Nanoparticles Bonded to SiO₂ Filler as a Curing Accelerator in Cold Vulcanizing Adhesives

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The aim of this study is to investigate the interaction of ZnO/SiO₂ particles between the chloroprene rubber and its effect on the cure characteristics and mechanical properties of the cold vulcanizing adhesives. Curing efficiency and mechanical properties of ZnO/SiO₂ filled adhesives were compared with SiO₂ filled adhesives. ZnO nanoparticles were bounded to SiO₂ spherical nanoparticles by hydrolysis and condensation process. The morphology and elemental content of ZnO/SiO₂ particles were investigated by scanning electron microscopy and energy dispersive spectroscopy. The ZnO/SiO₂ particles were then blended with chloroprene rubber as accelerator during the vulcanization process. Cure characteristics, which are scorch time (t_{s2}), cure time (t_{c90}), maximum torque (M_{H}) and minimum torque (M_{L}) of the rubber compounds were determined at 190°C with a moving die rheometer. The fabric conveyor belt was used for measuring adhesive strength of the adhesives. The fabric conveyor belt was used for measuring adhesive strength of the adhesives. Application of the cold vulcanizing adhesives to the fabric conveyor belt was carried out at three different times (4, 8, and 24 h), 25°C temperature and 0.3 kg/cm² pressure. The results showed that ZnO/SiO₂ particles provided a higher adhesive strength than silica in the 4, 8, and 24 h of adhesion. ZnO/SiO₂ filled rubber blends gained superior vulcanization characteristics by the increasing cure rate index with the reducing cure time and scorch time. It has been concluded that ZnO/SiO₂ particles can be used as a new curing accelerator and simultaneously reinforcing filler.
  • Bilecik Şeyh Edebali University, Faculty of Engineering, Department of Chemical and Process Engineering, 11210 Bilecik, Turkey
  • Afyon Kocatepe University, Faculty of Engineering, Department of Chemical Engineering, 03200 Afyonkarahisar, Turkey
  • Anadolu University, Faculty of Engineering, Department of Chemical Engineering, 26470 Eskişehir, Turkey
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