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<p>Silicone rubber exhibits inherent hydrophobicity and poor lubrication performance in aqueous environments, limiting its application in medical devices. To address this challenge, we developed a thermosetting lubricating coating by incorporating polyvinylpyrrolidone (PVP) into a polyurethane-based binder system enhanced with silane coupling agent (APTES) to improve adhesion. The coating was applied to silicone rubber substrates pretreated with heptane to ensure uniform and firm attachment. Its performance was evaluated through comprehensive characterization including FTIR, SEM, EDS, contact angle measurements, tribological tests, and antibacterial assays. Results demonstrated that a PVP concentration of 3% yielded optimal wettability, reducing the water contact angle from 102.6° to 57.3° and achieving a low friction coefficient of 0.17, outperforming commercial lubricating coatings. Furthermore, iodine loading significantly enhanced short-term antibacterial efficacy, with bactericidal rates reaching 96.7% against <i>Escherichia coli</i> and 97.8% against <i>Staphylococcus aureus</i>. Although iodine release limits long-term antibacterial performance, the PVP matrix itself exhibits durable intrinsic antibacterial activity. This study presents a dual-functional coating that combines excellent lubrication and antibacterial properties, offering a promising solution for surface modification of silicone rubber-based medical devices.</p>

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Developing a multifunctional coating on silicone rubber via a synergistic strategy for enhanced lubrication and antibacterial properties

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Guofa Zhang,
  • Qianqian Sun,
  • Bing Li,
  • Bo Wu,
  • Wei Ding,
  • Litao Wang,
  • Mei Lv

摘要

Silicone rubber exhibits inherent hydrophobicity and poor lubrication performance in aqueous environments, limiting its application in medical devices. To address this challenge, we developed a thermosetting lubricating coating by incorporating polyvinylpyrrolidone (PVP) into a polyurethane-based binder system enhanced with silane coupling agent (APTES) to improve adhesion. The coating was applied to silicone rubber substrates pretreated with heptane to ensure uniform and firm attachment. Its performance was evaluated through comprehensive characterization including FTIR, SEM, EDS, contact angle measurements, tribological tests, and antibacterial assays. Results demonstrated that a PVP concentration of 3% yielded optimal wettability, reducing the water contact angle from 102.6° to 57.3° and achieving a low friction coefficient of 0.17, outperforming commercial lubricating coatings. Furthermore, iodine loading significantly enhanced short-term antibacterial efficacy, with bactericidal rates reaching 96.7% against Escherichia coli and 97.8% against Staphylococcus aureus. Although iodine release limits long-term antibacterial performance, the PVP matrix itself exhibits durable intrinsic antibacterial activity. This study presents a dual-functional coating that combines excellent lubrication and antibacterial properties, offering a promising solution for surface modification of silicone rubber-based medical devices.