Study on Properties of High Density Polyethylene Doped Recycled Plastics

Abstract

High density polyethylene (HDPE) is widely used in the fields of packaging, piping and medical devices because of its high tensile strength, impact resistance and chemical corrosion resistance. In recent years, the quality requirements of high density polyethylene plastics are also increasingly high. The composition of polyethylene recycled plastics is complex, which has potential safety problems. Therefore, the detection of polyethylene plastics doped with recycled plastics has gradually become the focus of attention. In this study, the effects of different melt extrusion processing times and the mass ratio of doped recycled plastics on the properties of HDPE were carried out. The main research contents include: the mechanical properties of HDPE were tested by universal testing machine, and the thermal properties were tested by melt flow rate meter and differential scanning calorimeter. The results showed that with the increase of melting processing times, the elongation at break of HDPE decreased, the tensile strength increased slightly, the melt flow rate increased, the melting temperature increased slightly. While the oxidation induction time shortened. With the increase of doped recycled plastics in HDPE mass ratio, the elongation at break, tensile strength and melt flow rate decreased, the melting temperature decreased slightly, and the oxidation induction time shortened significantly. The development of this study provides technical support for plastic recycling and energy conservation and emission reduction.