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<p>An environmentally friendly waterborne polyurethane (CWPU) emulsion was developed via a dual modification strategy by combining both the silane coupling agent KH-602 with renewable castor oil (CO) as a sustainable substitute for petroleum-based polyols. The resulting materials were thoroughly characterized using Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). Furthermore, the influence of KH-602 content on the material properties was systematically investigated. The experimental results reveal that the incorporation of KH-602 significantly improves the thermal stability of the composite coating. As the KH-602 content increases, the tensile strength exhibits a gradual enhancement, while the elongation at break displays an initial increase followed by a subsequent decline. At an optimal KH-602 content of 3%, the coating demonstrates a balanced performance, achieving a tensile strength of 14.19 MPa and an elongation at break of 731.12%. These results suggest that the dual modification approach enhances mechanical and thermal properties while maintaining water resistance, making it suitable for sustainable coating applications.</p>

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Preparation and Performance Evaluation of Waterborne Polyurethane Modified with Silane Coupling Agent and Castor Oil

  • 期刊论文

  • 发表日期：

    2025年11月27日

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  • Yunxue Liu,
  • Qilin Sun,
  • Zhaorong Fan,
  • Yaxin Gu,
  • Xiumei Wang,
  • Peng Liu

摘要

An environmentally friendly waterborne polyurethane (CWPU) emulsion was developed via a dual modification strategy by combining both the silane coupling agent KH-602 with renewable castor oil (CO) as a sustainable substitute for petroleum-based polyols. The resulting materials were thoroughly characterized using Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). Furthermore, the influence of KH-602 content on the material properties was systematically investigated. The experimental results reveal that the incorporation of KH-602 significantly improves the thermal stability of the composite coating. As the KH-602 content increases, the tensile strength exhibits a gradual enhancement, while the elongation at break displays an initial increase followed by a subsequent decline. At an optimal KH-602 content of 3%, the coating demonstrates a balanced performance, achieving a tensile strength of 14.19 MPa and an elongation at break of 731.12%. These results suggest that the dual modification approach enhances mechanical and thermal properties while maintaining water resistance, making it suitable for sustainable coating applications.