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<p>Ultra-high molecular weight polyethylene (UHMWPE) ropes will suffer from severe tensile strength loss due to Norrish II type fracture of methylene chains under UV irradiation. In this study, nano-silica (SiO₂) was used to enhance the UV durability of waterborne polyurethane (WPU) coatings. Nano-SiO₂ was modified by KH550 to improve its compatibility with WPU, and best-performing formulation the tested candidates was selected for further study (27% WPU, 0.9% SiO₂). Through a comprehensive analysis combining accelerated UV aging tests, tensile wear tests, scanning electron microscopy (SEM) observations, differential scanning calorimetry (DSC) measurements, and Fourier transform infrared spectroscopy (FTIR) analyses, it is revealed that the UHMWPE ropes coated with WPU layer and SiO₂/WPU layer exhibit higher residual strength rates after 30&#xa0;days of aging compared to the uncoated UHMWPE ropes. After applying the WPU coating, the residual strength rate of the rope increased from 28% before the coating to 35.7%, and the residual strength rate of the SiO₂/WPU coating further increased to 40.5%. SEM images show that during bending and wear, the SiO₂/WPU composite coating relies on nanoparticles to prevent cracks and reduce friction, and it has better wear resistance and fiber protection effects than pure WPU coating.</p>

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Ultraviolet Durability Optimization of UHMWPE Rope Coated by Nano-silica Enhanced Waterborne Polyurethane

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Jingwen Bao,
  • Yuanyuan Li,
  • Yantao Gao,
  • Yigang Su

摘要

Ultra-high molecular weight polyethylene (UHMWPE) ropes will suffer from severe tensile strength loss due to Norrish II type fracture of methylene chains under UV irradiation. In this study, nano-silica (SiO₂) was used to enhance the UV durability of waterborne polyurethane (WPU) coatings. Nano-SiO₂ was modified by KH550 to improve its compatibility with WPU, and best-performing formulation the tested candidates was selected for further study (27% WPU, 0.9% SiO₂). Through a comprehensive analysis combining accelerated UV aging tests, tensile wear tests, scanning electron microscopy (SEM) observations, differential scanning calorimetry (DSC) measurements, and Fourier transform infrared spectroscopy (FTIR) analyses, it is revealed that the UHMWPE ropes coated with WPU layer and SiO₂/WPU layer exhibit higher residual strength rates after 30 days of aging compared to the uncoated UHMWPE ropes. After applying the WPU coating, the residual strength rate of the rope increased from 28% before the coating to 35.7%, and the residual strength rate of the SiO₂/WPU coating further increased to 40.5%. SEM images show that during bending and wear, the SiO₂/WPU composite coating relies on nanoparticles to prevent cracks and reduce friction, and it has better wear resistance and fiber protection effects than pure WPU coating.