FARIAS, C. G.; http://lattes.cnpq.br/2922885697021371; FARIAS, Claudia Gomes de.
Resumen:
The rising production of industrial plastics and of plastics packing waste has
rendered plastics recycling increasingly important. Recycling of these systems, however, is
difficult as polymer blending usually leads to incompatible products and polymer
properties depend on molecular weight and molecular weight distribution, the presence of
impurities, moulding methods and processing conditions as well as degradation caused by
use.
The performance of recycled plastics can ber enhanced by criterious material
selection and separation methods, the proper choice of specific aditives and processing
conditions. In this work the effect of different mixing conditions on the performance of
four different plastics formulations based on recycled PP/CaCC>3 was ascertained. These
formulations differed among them selves by the addition of PE wax, apoxidated soyabean
oil and a mixture of both of these additives. Different mixing conditions were obtained by
the use of serews with three different profiles during extrusion.
Our results show that PE wax addition did not significantly alter the
mechanical properties of the base formulation while addition of a epoxidated soyabean oil
or of a misture both, did lower tensile strenght at break, elastic modulus and hardness and
increased impact strenght, elongation at break and flexural strenght of the formulations
under study. Varying screw profiles did not lead to significant variations on mechanical
properties, however, processing energy was much lower with screw •£ 1 (standard screw). A
better balance of mechanical property energy spent on processing was obtained of the
formulation containing both: PE wax and epoxidated soyabean oil, extruded with the
standard screw.
