Abstract
An efficient recycling of end-of-life products is of crucial interest from an economical and ecological point of view. However, the near infrared spectroscopy often used for the optic sorting processes is limited because of the absorption of carbon black present in black plastics and as it only sorts as a function of chemical formulas. The tracing technology developed in this study is based on the dispersion of lanthanide complexes particles into polymers to give them a code that can be related to their formulation and viscosity that are important parameters for their re-processing. As the success of this technology is conditioned by achieving a fine dispersion of the tracer particles, we also focus on accomplishing a fine dispersion of tracer particles by using a high shear process. Processing under high shear rate (N= 800 rpm) has proved to play a determining role in dispersing finely and homogenously tracer particles within PP matrix. Thanks to the good quality of dispersion, the detection of three tracers at a level of 0.1 wt% has been successfully achieved, even in black matrices for an acquisition time of 10 ms.
Highlights
The plastics success is owing to their attractive technique was successfully applied for identification performances, inexpensive, durable materials, lightweight, of HDPE, Low Density Polyethylene HDPE (LDPE), Polypropylene PS (PP), Ethyl Vinyl Acetate copolymer flame retardants (FR) (EVA), Poly(Vinyl Chloride) relative standard deviation (RSD) (PVC) and PET polymers
Before proceeding to the characterization of tracer’s dispersion, in the first instance, it was appropriate to examine the structure of T3 tracer which was delivered in micrometer powder
As clearly seen from Scanning Electron Microscopy (SEM) micrographs taken at different magnifications (Figure 3), the T3 powder is organized in form of sticks which aggregate together to form large agglomerates
Summary
The plastics success is owing to their attractive technique was successfully applied for identification performances, inexpensive, durable materials, lightweight, of HDPE, LDPE, PP, EVA, PVC and PET polymers. The near-infrared technique (NIR) can mentioned above, tracing technologies based on tracer be used to detect the fluorescence of tracers based on rare systems can be used to refine the sorting of end-of-life earths with concentrations ranging from 0.001 to 1 ppm in products, especially those having close densities or black polymers. This method has shown its limitation ones. In this study, we investigate the effect of extrusion (variation of speed for a screw profile dedicated to dispersion of fillers) on the morphological development, thermal, mechanical as well as optical properties of a traced polyolefin formulation
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