Scholarlink

<p>Since the main solvent of waterborne polyurethane (WPU) is water, its water resistance is poor. Additionally, the low oxygen index of WPU adhesive films limits their flame-retardant efficacy as coatings, thereby restricting their application scope. To address these limitations, this study independently modified the hydrophobicity and flame retardancy of WPU. First, a cyclophosphonitrile derivative (HCCP-6) was synthesized as a flame retardant. Flame-retardant WPU (NPWPU) was then prepared by reacting the –NH<sub>2</sub> group of HCCP-6 with the –NCO group of a polyurethane prepolymer, incorporating the flame-retardant properties into the WPU polymer chain via free-radical grafting. Next, hydrophobic F-SiO<sub>2</sub> suspensions were prepared and combined with NPWPU emulsions of varying concentrations. The mixtures were sprayed onto cotton fabrics using an airbrush to produce waterproof, flame-retardant polyurethane-coated textiles. Results demonstrated that NPWPU/F-SiO<sub>2</sub>-coated cotton fabrics exhibited water contact angles exceeding 150°, indicating excellent hydrophobicity. These fabrics also showed increased char residue, reduced total heat release, and suppressed smoke production. This performance stems from the synergistic flame-retardant effect of nitrogen (N) and phosphorus (P), coupled with the high-temperature resistance of SiO<sub>2</sub>, which promotes char formation, shields the material’s inner layers from thermal degradation, and enhances overall flame retardancy.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Preparation and characterization of waterborne polyurethane coatings modified with cyclotriphosphonitrile derivative for waterproof and flame-retardant cotton fabrics

  • 期刊论文

  • 发表日期：

    2025年9月5日

查看全文
  • Haitao Zhou,
  • Tianhao Lu,
  • Wulin Xia,
  • Guankun Kuang,
  • Ying Qin,
  • Xiaoxiao Peng,
  • Yan Liu,
  • Binjie Xin

摘要

Since the main solvent of waterborne polyurethane (WPU) is water, its water resistance is poor. Additionally, the low oxygen index of WPU adhesive films limits their flame-retardant efficacy as coatings, thereby restricting their application scope. To address these limitations, this study independently modified the hydrophobicity and flame retardancy of WPU. First, a cyclophosphonitrile derivative (HCCP-6) was synthesized as a flame retardant. Flame-retardant WPU (NPWPU) was then prepared by reacting the –NH2 group of HCCP-6 with the –NCO group of a polyurethane prepolymer, incorporating the flame-retardant properties into the WPU polymer chain via free-radical grafting. Next, hydrophobic F-SiO2 suspensions were prepared and combined with NPWPU emulsions of varying concentrations. The mixtures were sprayed onto cotton fabrics using an airbrush to produce waterproof, flame-retardant polyurethane-coated textiles. Results demonstrated that NPWPU/F-SiO2-coated cotton fabrics exhibited water contact angles exceeding 150°, indicating excellent hydrophobicity. These fabrics also showed increased char residue, reduced total heat release, and suppressed smoke production. This performance stems from the synergistic flame-retardant effect of nitrogen (N) and phosphorus (P), coupled with the high-temperature resistance of SiO2, which promotes char formation, shields the material’s inner layers from thermal degradation, and enhances overall flame retardancy.