Abstract

A halogen-free, non-formaldehyde and eco-friendly bio-based synergistic flame retardant containing phosphorus–boron–nitrogen elements were synthesized and applied on cotton fabrics. Three curing cycles in cotton finishing process were employed. Samples treated with 30 g/L PBN solutions revealed the best result, while high concentrations did not gain more weight increase nor improved performance on the products. The SEM morphologies suggested penetration of ammonium phytate groups to the inner space and floatation of boron-containing groups on the surfaces of the cotton fibers. FTIR and XPS analyses indicated that after 50 laundering cycles, the boron can still stay on the surface of the treated cotton fibers. The LOI value of 30 g/L PBN finished cotton fabrics reached 45.0% and remained at 37.6% after 50 LCs. The char length of the treated cotton sample was 63 mm, whereas the control sample was 300 mm. The TG analysis in N₂ demonstrated that the decomposition temperature of the treated fabric slightly decreased, while the thermal oxidation stability was significantly improved. Cone calorimetry analysis showed that the peak heat release rate, total heat release, and effective heat combustion of the treated samples were substantially reduced compared with the control sample at 50 kW/m². LOI, TG, vertical burning and cone calorimetry showed that the PBN treated samples had good flame retardancy and thermal stability.

Graphic abstract

中文翻译：

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一种基于植酸的螯合配位嵌入结构的磷-硼-氮化物协同阻燃剂，可增强棉花的耐久性和阻燃性

摘要

合成了一种含磷，硼，氮元素的无卤，无甲醛，生态友好的生物基协同阻燃剂，并将其应用于棉织物上。在棉花整理过程中使用了三个固化周期。用30 g / L PBN溶液处理的样品显示出最佳结果，而高浓度并没有增加产品的重量或改善其性能。SEM形态表明植酸铵基团渗透到内部空间中，并且含硼基团在棉纤维表面上漂浮。FTIR和XPS分析表明，经过50个洗涤周期后，硼仍然可以留在处理过的棉纤维表面上。30 g / L PBN成品棉织物的LOI值达到45.0％，经过50 LC后仍保持在37.6％。处理过的棉花样品的焦炭长度为63mm，而对照样品为300mm。N中的TG分析_由图2可知，处理后的织物的分解温度略有降低，而热氧化稳定性显着提高。锥量热分析表明，与50 kW / m ²的对照样品相比，处理后的样品的峰值放热速率，总放热和有效热燃烧显着降低。LOI，TG，垂直燃烧和锥形量热法表明，PBN处理的样品具有良好的阻燃性和热稳定性。

图形摘要