Collagen fiber (CF) and silane coupling agent-modified collagen fiber (MCF) were used as flame retardant filler for natural rubber (NR) modification. The combustion phenomena and properties of composites blended with different dosages of CF or MCF were compared to elucidate the flame retardant mechanism of the composites. The flame retardancy of NR can be enhanced effectively by increasing nitrogen content (the nitrogen content of CF is about 18%), creating air pockets, and structuring the flame retardant network in the composites. MCF failed to structure a flame retardant network in the composite, indicating that its modification effects of MCF are weaker than those of CF. When CF dosage was 30 wt%, the composite can achieve the best flame retardancy, with limited oxygen index of 29.4% and without smoke and dripping during burning. This study demonstrated a new method for the flame retardant modification of NR.

中文翻译：

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添加胶原蛋白纤维对天然橡胶燃烧和热稳定性的影响

胶原蛋白纤维（CF）和硅烷偶联剂改性的胶原蛋白纤维（MCF）被用作天然橡胶（NR）改性的阻燃填料。比较了不同掺量的CF或MCF的复合材料的燃烧现象和性能，以阐明复合材料的阻燃机理。NR的阻燃性可以通过增加氮含量（CF的氮含量约为18％），形成气穴以及在复合材料中构造阻燃网络来有效增强。MCF无法在复合材料中构建阻燃网络，表明MCF的改性作用比CF弱。当CF用量为30 wt％时，复合材料可以获得最佳的阻燃性，氧指数限制为29.4％，燃烧时不会冒烟和滴落。