Abstract A triazine-based macromolecular hybrid charring agent containing zinc borate (MCA-K-ZB) was synthesized and combined with ammonium polyphosphate (APP) to improve the flame retardancy of polypropylene (PP). The flame retardancy and thermal properties of PP composites were investigated using limited oxygen index, vertical burning test, and thermogravimetric analysis. The results showed APP/MCA-K-ZB can improve the flame retardancy of PP compared with APP/MCA-K/ZB. The morphology of the char residues was investigated by scanning electron microscopy (SEM). The SEM result shows that MCA-K-ZB can improve the compactness and continuity of char residue compared with MCA-K/ZB, therefore improving the flame retardancy of PP composites.

中文翻译：

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含硼酸锌三嗪类高分子杂化炭化剂的合成及其在聚丙烯中的阻燃和热性能

摘要 合成了一种含硼酸锌的三嗪类高分子杂化成炭剂（MCA-K-ZB），并与聚磷酸铵（APP）结合以提高聚丙烯（PP）的阻燃性能。使用有限氧指数、垂直燃烧试验和热重分析研究了 PP 复合材料的阻燃性和热性能。结果表明，与APP/MCA-K/ZB相比，APP/MCA-K-ZB可以提高PP的阻燃性。通过扫描电子显微镜（SEM）研究炭残留物的形态。SEM结果表明，与MCA-K/ZB相比，MCA-K-ZB可以提高炭渣的致密性和连续性，从而提高PP复合材料的阻燃性。