The main aim of this paper is to carry out ABS/PUR mixtures with different concentrations of PUR. The PUR residues originate from the manufacture of refrigerators and freezers. The use of this type of residue generates environment problems when discharging this material. The homogenization of each mixture was made with a single screw extruder. A part of the extruded and granulated material was used for the accomplishment of assays of Melt Flow Index (MFI) and another part was used in the process of moulding specimens by injection, in order to determine the specific mass and also obtain some samples of technical parts. The results of the assays of fluidity index had been initially transformed into volumetric outflow. For this to happen, the values of determined specific mass for the respective mixtures had been used. Later, by means of rheologic equations the the viscosity of the different mixtures was calculated at 220ºC. A rheologic curve was interpolated on the points for each case. Assays of traction had been carried out in the specimens injected with different concentrations, which determined that the modulus of elasticity increases linearly with the increase of the PUR concentration and the maximum tension supported by the material decreases with the PUR increment. It was determined that the increase of the viscosity of the mixtures provoked variations in the injection process, even though, it was possible to inject different lots of technical parts. Considering the mechanical and rheological properties obtained for the mixtures it could be concluded that the manufacture of some types of components could be viable.
Index of fluidity; viscosity; mechanical property; specific mass
