Preparation Of Zinc Oxide With Core-shell Structure And Its Application In Rubber Products

Zinc oxide is mainly used as an active agent in rubber products.So far zinc oxide is still an irreplaceable part of the vulcanization system.Zinc oxide is widely used because of its advantages such as accelerated vulcanization,improved processing properties,physical and mechanical properties,and heat resistance.However,the reduction of zinc oxide use in rubber products has become a focus of attention because of its massive application,which can cause irreversible damage to the environment.In this study,we first investigated the effects of ZnO preparation process parameters（e.g.,solution concentration,reaction and calcination temperatures,active agent dosage,and solution pH）on the crystalline shape and morphology of ZnO,and investigated the mechanisms of different crystalline shape formation.The results showed that when the reaction temperature was 60°C and calcination temperature was 400°C-600°C,the prepared ZnO nanocomposites accelerated the vulcanization rate and increased the tensile strength by 2.6 MPa and the tear strength by 5.0%relative to the indirect method ZnO composites.Next,core-shell structured ZnO with different ZnO contents were prepared using different carriers（e.g.calcium carbonate,barium sulfate,silica,thermally cracked carbon black and graphene）,and the prepared core-shell structured ZnO was characterized morphologically using scanning electron microscopy.It was found that the ZnO particles were mainly wrapped around the carrier material in a spherical structure,and the particle size of the ZnO particles was in the nanometer range.The results showed that the core-shell structured ZnO could improve the crosslinking of the rubber,accelerate the vulcanization rate,and improve the mechanical properties of the rubber.among ZnO@BaSO₄The core shell structure can increase tensile strength by 12.3%,tear elongation by 19.9%,and tear strength by 24.1%.Different carrier structures of ZnO and indirect method ZnO were added to the formulations of semi-steel radial tire tread rubber and sidewall rubber to study their effects on vulcanization characteristics,mechanical properties,friction properties,aging properties and dynamic thermo-mechanical properties of the rubber materials.The results show that the addition of zinc oxide with core-shell structure can not only ensure its vulcanization characteristics and physical and mechanical properties in rubber products,but also reduce the amount of zinc oxide in rubber products,which brings great economic benefits to the rubber products industry and makes an important contribution to environmental protection.