Key Laboratory of Natural and Biomedical Polymer Materials (Guilin University of Technology), College of Materials Science and Engineering, Guilin University of Technology (GUT), Guilin 541004, China.
SINOPEC (Beijing) Research Institute of Chemical Industry Co., Ltd., China.
Int J Biol Macromol. 2024 Nov;281(Pt 2):135733. doi: 10.1016/j.ijbiomac.2024.135733. Epub 2024 Sep 30.
To address the current development requirements for multifunctional cotton fabrics, a phytic acid-induced flame-retardant hydrophobic coating containing nitrogen (N), phosphorus (P), and silicon (Si) was grafted on the surface of cotton fabrics using a facile step-by-step immersion method. The limiting oxygen index value improved to 31.2 %, decreasing to 26.7 % after 50 laundering cycles, while the fabric remained self-extinguishing effect in the vertical flammability test and showed a water contact angle of 126.1°. Cone calorimetry test showed that the modified fabric could not be ignited at the irradiation heat flux of 35 kW/m. When the irradiation heat flux was raised to 50 kW/m, there was a significant decline in the peak heat release rate of the modified cotton fabric, which decreased by 43.2 % to a remarkably low value of 114.0 kW/m, indicating excellent flame-retardant properties. The analysis of the flame-retardant mechanism uncovered that the modified coating exhibited a significant dual flame-retardant mechanism involving both the gaseous phase and the condensed phase. Additionally, the oil-water separation tests revealed that the separation efficiency of the modified cotton fabrics was as high as 97.1 % and remained around 96 % after 10 cycles, which made them reusable for the clean-up of hazardous chemicals.
为了满足多功能棉织物的当前发展需求，采用简便的分步浸渍法在棉织物表面接枝了一种含有氮（N）、磷（P）和硅（Si）的植酸诱导的阻燃疏水性涂层。极限氧指数值提高到 31.2%，经过 50 次洗涤循环后降至 26.7%，而织物在垂直可燃性测试中仍保持自熄效果，水接触角为 126.1°。锥形量热计测试表明，改性织物在 35 kW/m 的辐照热通量下无法点燃。当辐照热通量提高到 50 kW/m 时，改性棉织物的峰值热释放率显著下降，下降了 43.2%，达到 114.0 kW/m，表明具有优异的阻燃性能。阻燃机理分析表明，改性涂层表现出明显的气相和凝聚相双重阻燃机理。此外，油水分离测试表明，改性棉织物的分离效率高达 97.1%，经过 10 次循环后仍保持在 96%左右，可重复用于清除危险化学品。
