Abstract
Abstract The reductionin zinc oxide (ZnO) content in elastomeric compositions has become a subject due to the deleterious effect of zinc ions on aquatic organisms. The purpose of this study was to develop elastomeric compositions containing 0, 1, 3 and 5 phr of ZnO aiming at assessing the influence of the different contents on the rheometric, mechanical and thermal properties. The release of the zinc (Zn) content by leaching, at each step of the production and after the ageing was also assessed. All ZnO-containing compounds had similar rheometric, thermal and mechanical properties. Also, during and after exposure to accelerated ageing the released contents were similar for all compositions regarding the residual ZnO percent. In conclusion, the utilization of the 3 phr ZnO content is viable for the replacement of the usual amount employed.
Highlights
The reduction in zinc oxide (ZnO) content in elastomeric the organisms present in solution
As for ML which is indicative of processability, the highest value was obtained for the FC1/AE/0 sample, without ZnO, which is coherent with the Mooney values for viscosity
By relating the data for Zn released during leaching with the required amount of stearic acid to react with ZnO (Table 4), it was possible to understand that the amounts of Zn released in leaching are lower than expected
Summary
The reduction in ZnO content in elastomeric the organisms present in solution. By evaluating Zn release compositions has become a subject of technological and to the eluate with pH varying between 3 and 7, a reduction industrial interest due to the deleterious effect of zinc ions in release with pH increase could be observed. Zn release to the environment concluded that Zn release to the environment can occur by can occur during production, elimination and recycling means of natural phenomena such as rain and wind, and of elastomeric products, it is relevant to keep this can cause toxicity in aquatic species. According to the 2004/73/CE European Norm, Zn is classed as deleterious and toxic for aquatic organisms with lasting effects[3]
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