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<p>Residues left after sorting useful plastics at the plastic recycling facility are literally garbage that can only be incinerated or landfilled. We transformed these residues into hydrochar through hydrothermal carbonization using saturated steam at 230&#xa0;°C. The characteristics of the hydrochar were evaluated, and blends composed of various polymers and hydrochar were fabricated through melt blending in an extruder. The polymers used included recycled polypropylene (PP), recycled polyethylene (PE), virgin PP, virgin PE, and polyamide 6 (PA6). The mechanical properties of PP/hydrochar and PE/hydrochar blends were found to be high without the need for a compatibilizer. On the other hand, polyamide 6/hydrochar blends showed typical characteristics of poor compatibility. A significant negative deviation was observed in the PA6/hydrochar blend, which may be due to the fact that around 60% of the hydrochar consists of PP and PE. By incorporating elastomers commonly used in PP compounds into recycled PP/hydrochar blends, the impact strength of the blends was significantly improved. The impact strength of the recycled PP/hydrochar (70 wt%/30 wt%) blend increased significantly when just 5 phr of elastomer was added, surpassing even the impact strength of recycled PP alone. This study provides proof of the viability of physically recycling plastic sorting waste.</p>

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Study on polymer blends from recycled plastics and hydrothermally carbonized plastic wastes

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Namho Kim,
  • Jeongyoun Park,
  • Hiehyeon Sim,
  • Jihoon Lee,
  • Mincheol Lee,
  • Younggon Son

摘要

Residues left after sorting useful plastics at the plastic recycling facility are literally garbage that can only be incinerated or landfilled. We transformed these residues into hydrochar through hydrothermal carbonization using saturated steam at 230 °C. The characteristics of the hydrochar were evaluated, and blends composed of various polymers and hydrochar were fabricated through melt blending in an extruder. The polymers used included recycled polypropylene (PP), recycled polyethylene (PE), virgin PP, virgin PE, and polyamide 6 (PA6). The mechanical properties of PP/hydrochar and PE/hydrochar blends were found to be high without the need for a compatibilizer. On the other hand, polyamide 6/hydrochar blends showed typical characteristics of poor compatibility. A significant negative deviation was observed in the PA6/hydrochar blend, which may be due to the fact that around 60% of the hydrochar consists of PP and PE. By incorporating elastomers commonly used in PP compounds into recycled PP/hydrochar blends, the impact strength of the blends was significantly improved. The impact strength of the recycled PP/hydrochar (70 wt%/30 wt%) blend increased significantly when just 5 phr of elastomer was added, surpassing even the impact strength of recycled PP alone. This study provides proof of the viability of physically recycling plastic sorting waste.