Investigation Of Used Automotive Plastics Identification Technology

Automobile lightweight technology makes cars using more and more consumption of plastics. In the retirement stage, however, these plastics are difficult to indentify and separate, resulting to difficulties on recycling, limiting the increased utilization of the actual recovery of automotive products. Therefore, the study of automotive plastics scrap and identification technology is of great significance for the automotive industry to implement recycling economy and promote sustainable development.In this paper, based on the literature review of automotive plastics recycling technology and the study of product life-cycle assessment of bumper, we establish the technology list of 225 kinds of automotive plastics recycling technology at three levels (physical re-use, chemical re-use and energy recovery).The study provides a scientific basis and theoretical guidance for the standardization of Chinese automotive material recycling technology.Second, we set up an automobile plastic mid-infrared identification system, which has a more than 200 kinds of auto plastic mid-infrared spectral library. The system provides recognition benchmark for the subsequent development of practical, effective identification technology and methods for automotive plastics.Third, to meet the requirements of the site identification for junk cars dismantling, we set up an automobile plastic near-infrared identification system, which can identify six kinds of automobile plastics (PP, PE, ABS, PA, PC, PMMA). The results show that the system recognition accuracy rate exceeds 95%, which could meet the requirements of the site identification.Finally, because the black carbon in automotive plastics affects the near-infrared recognition accuracy rate severely, we conducted basic experimental study of triboelectric series identification technologies, and investigated triboelectric series identification technologies and electrostatic separation method in the automotive plastics separation. We believed that it's a important technical means for automotive plastics to increase indentification accuracy and implement large-scale separation, and providing a new idea for large-scale separation of automotive plastics .The innovation lies in this: we researched and developed the grating dispersion-type "automotive plastics near-infrared identification system", which can identify six kinds of automobile plastics (PP, PE, ABS, PA, PC, PMMA), with recognition accuracy rate of more than 95% to meet the on-site identification requirements; in order to overcome the effect of the black carbon in automotive plastics to recognition accuracy, we conducted basic experimental study of triboelectric series identification technologies, used Faraday cup method to access the automotive plastics triboelectric series as follows: ( +) PA→PMMA→PC+ABS→ABS→Cu→PP→PE (-), which has no effects from the sample color to additive, providing a new idea for large-scale separation of automotive plastics; we set up an automobile plastic mid-infrared identification system, which included mid-infrared spectroscopy, attenuated total reflection (ATR) accessory and automotive plastics mid-infrared spectra gallery, providing a benchmark for the research and development of automotive plastic identification technology.