Preliminary evaluation of the rheological properties of High Density Polyethylene (HDPE) with use of recycling reology agent

Abstract

The High Density Polyethylene (HDPE) is a thermoplastic material with good performance and general use properties in the manufacturing industry being processed and blow molded, extruded and injected. Its low cost and easy processing makes HDPE one of the materials most used in the manufacture of several products in the world. Being a thermoplastic, its recycling is allowed, through a simple process and without major demands, however, due to the large consumption a large amount of material is generated in addition to costly recycling processes. In the recycling process there are losses of properties and the quality of the material thus compromising the use of the same, as well as, its applications in the market. The objective of this work is to study an additive developed as a rheology modifying agent for use in recycled materials. The materials were prepared according to 8 types divided into two groups with and without addition of additive and in the process condition being reprocessed or milled. Preliminary results such as Fourier Transform Infrared (FTIR) spectroscopy indicate the presence of peroxide in the additive, but in small amounts without the ability to completely crosslink. Mechanical tests with the test Proof Bodies (CP) for tensile, impact and flexural strength show great improvement in their properties, however in the fluidity index there is a decrease. The thermogravimetric or Thermogravimetric Analysis (TGA) tests present little variation of the mass loss for the CP, and the Differential Scanning Calorimetry (DSC) the presence of endothermic reactions. This work can contribute by facilitating the use of recycled HDPE in a more practical and efficient manner, taking into account the industrial and environmental demands from the addition of additive with maintenance of the mechanical properties of the recycled material.