Determining the Composition of Imported Recycled Plastics with Differential Scanning Calorimetry

Abstract

The analysis of the composition of recycled plastics is the prerequisite for identifying the properties of recycled plastics goods-solid waste. This paper systematically studies the composition of crystalline polymers by differential scanning calorimetry, and studies the common blends of polyethylene and polypropylene. The composition of polyamide 6 and polyamide 66 blends, polyethylene and polyamide blends and other common recycled plastics. The standard enthalpy value method and the melting enthalpy area normalization method are compared. The conclusion is that the melting enthalpy area normalization method is more beneficial Determine the composition of recycled plastics. For polyethylene/polypropylene blends, the repeatability of polyethylene and polypropylene should not exceed 5%; for polyamide 6/polyamide 66 blends, the repeatability of polyamide should not exceed 5%. More than 3%; For blends of polyethylene and polyamide, the repeatability of polyethylene and polyamide should not exceed 6%.