Abstract

Bio-resourced mannitol was employed to synthesize eco-friendly ammonium salt of mannitol hexaphosphate acid ester (AMHPE) by facile, solvent-free tactics. Limiting oxygen index (LOI) of cotton treated with 20–30% AMHPE reached 36.0–42.3% to obtain high-efficiency flame retardancy. After 50 laundering cycles, the LOI value of 30% AMHPE treated cotton still retains an LOI value of 27.9%, revealing outstanding durability owing to new P–O–C covalent bonds formed bewteen –P = O(ONH₄)₂⁺ groups of AMHPE and cotton. The decomposition temperature of treated cotton was significantly lowered and its char residue was much higher than control cotton in N₂. The PHRR and THR values of treated cotton were notably declined to 93.41% and 56.54% respectively, and the residual is 28 times higher by contrast. The combustion products and flame retardant mechanism of treated cotton were analyzed by TG-IR and cone calorimetry. These results indicate that AMHPE flame retardant cotton has acquired efficient flame retardancy, excellent durability and thermostability.

Graphic abstract

Solvent-free synthesis of bio-resourced N–P synergetic flame retardant possessing excellent flame retardancy, unexceptionable durability and thermostability to reduce cotton fire hazard.

中文翻译：

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一种生物来源的甘露醇磷脂铵活性棉阻燃剂，具有高效的阻燃性和耐用性

摘要

采用生物来源的甘露醇，通过简便，无溶剂的策略合成了环保型甘露醇六磷酸酯铵盐（AMHPE）。使用20–30％AMHPE处理的棉花的极限氧指数（LOI）达到36.0–42.3％，以获得高效阻燃性。经过50个洗涤周期后，经30％AMHPE处理的棉的LOI值仍保持27.9％的LOI值，由于–P = O（ONH ₄）₂ ⁺基团之间形成了新的P–O–C共价键，因此显示了出色的耐久性。 AMHPE和棉。在N _2中，处理后的棉花的分解温度显着降低，其炭渣含量远高于对照棉。。处理后的棉花的PHRR和THR值分别显着下降至93.41％和56.54％，相比之下，残留量高出28倍。用TG-IR和锥形量热法分析了处理后棉的燃烧产物和阻燃机理。这些结果表明AMHPE阻燃棉具有有效的阻燃性，优异的耐久性和热稳定性。

图形摘要

生物合成的氮磷协同阻燃剂的无溶剂合成，具有出色的阻燃性，无与伦比的耐久性和热稳定性，可减少棉花着火的危险。