Wei Jieyu, Li Tian, Li Hejun, Lu Yonghua, Liang Mengxiao, Zhang Guangxian
State Key Laboratory of Resource Insects, College of Sericulture Textile and Biomass Sciences, Southwest University, Chongqing 400715, China.
State Key Laboratory of Resource Insects, College of Sericulture Textile and Biomass Sciences, Southwest University, Chongqing 400715, China.
Int J Biol Macromol. 2025 Mar;293:139279. doi: 10.1016/j.ijbiomac.2024.139279. Epub 2024 Dec 27.
In this study, two phosphorus-based flame retardants diethylenetriamine trimethyl diphosphonate lysine (APTA) and a tetrakis(hydroxymethyl)phosphonium sulfate prepolymer with urea (DUPT) were synthesized. The structures of these compounds were characterized via nuclear magnetic resonance (NMR) and Fourier-transform infrared spectroscopy (FTIR). FTIR and scanning electron microscopy (SEM) analyses revealed that DUPT crosslinked APTA onto cellulose, which was pre-processed with diethylenetriamine dipropylene oxide (NAED) to introduce NH groups through PCN bonds. The APTA/DUPT-30 cotton exhibited a limiting oxygen index (LOI) of 36.4 % and a damaged length of 4.8 cm. After 50 washing cycles, the treated cotton maintained an LOI of 30.5 % and a damaged length of 5.4 cm. These results indicate the exceptional flame retardancy and washing resistance of the treated cotton fabrics. Moreover, the thermogravimetry (TG) curves indicated that APTA/DUPT altered the degradation process of the cotton fabrics. The TG-FTIR data and residue analysis from the vertical flame-retardant test confirmed that the treated cotton utilized a condensed-phase flame-retardant mechanism. Overall, this approach effectively imparts excellent durable flame retardancy to cotton fabrics through stable PCN bonds, eliminating the need for specialized equipment.
在本研究中，合成了两种磷基阻燃剂二亚乙基三胺三甲基二膦酸赖氨酸（APTA）和一种含尿素的四羟甲基硫酸鏻预聚物（DUPT）。通过核磁共振（NMR）和傅里叶变换红外光谱（FTIR）对这些化合物的结构进行了表征。FTIR和扫描电子显微镜（SEM）分析表明，DUPT通过用二亚乙基三胺二环氧丙烷（NAED）预处理纤维素以通过PCN键引入NH基团，从而将APTA交联到纤维素上。APTA/DUPT-30棉的极限氧指数（LOI）为36.4%，损毁长度为4.8厘米。经过50次洗涤循环后，处理后的棉保持LOI为30.5%，损毁长度为5.4厘米。这些结果表明处理后的棉织物具有优异的阻燃性和耐洗性。此外，热重分析（TG）曲线表明APTA/DUPT改变了棉织物的降解过程。TG-FTIR数据和垂直阻燃测试的残渣分析证实，处理后的棉采用了凝聚相阻燃机理。总体而言，这种方法通过稳定的PCN键有效地赋予棉织物优异的持久阻燃性，无需专门设备。
