Improving the hygroscopicity and flame retardancy of polyamide 6 fabrics by surface coating with β-FeOOH and sulfamic acid
writer：Jian Liu
keywords：Flame retardant，Hydrophilicity，Moisture permeability，PA6 fabrics
source：期刊
Issue time：2023年
The combustion of polyamide 6 (PA6) fabrics releases toxic smoke, which will pollute the environment and threaten human life and health. Herein, a novel eco-friendly flame-retardant coating was constructed and applied to PA6 fabrics. Needle-like β-FeOOH with a high surface area was firstly constructed onto the surface of PA6 fabrics by the hydrolysis of Fe3+, sulfamic acid (SA) was then introduced by a facile dipping and nipping method. The growth of β-FeOOH also endowed the PA6 fabrics with certain hydrophilicity and moisture permeability, resulting in improved comfortability. The limiting oxygen index (LOI) of the prepared PA6/Fe/6SA sample was increased to 27.2% from 18.5% of control PA6 sample, and the damaged length was reduced to only 6.0?cm from 12.0?cm of control PA6 sample. Meanwhile, the melt dripping was also eliminated. The heat release rate and total heat release values of the PA6/Fe/6SA sample were decreased to 318.5?kW/m2 and 17.0?MJ/m2, respectively, compared with those of control PA6 (494.7?kW/m2 and 21.4?MJ/m2). The analysis results indicated that nonflammable gases diluted flammable gases. The observation of char residues demonstrated that the stable char layer was formed, which effectively inhibited the transfer of heat and oxygen. The organic solvent-free coating does not contain any conventional halogens/phosphorus elements, which provides a useful methodology to produce environmentally friendly flame-retardant fabrics.
錦綸6（PA6）織物燃燒會釋放有毒煙霧，污染環境，威脅人類生命健康。在此，構建了一種新型環保阻燃涂層并將其應用于 PA6 織物。首次通過Fe 3+的水解將具有高表面積的針狀β-FeOOH構建到PA6織物的表面，然后通過簡便的浸漬和夾壓方法引入氨基磺酸（SA）。β-FeOOH的生長也賦予了PA6織物一定的親水性和透濕性，從而提高了舒適性。制備的 PA6/Fe/6SA 樣品的極限氧指數 (LOI) 從對照 PA6 樣品的 18.5% 增加到 27.2%，并且損傷長度從對照 PA6 樣品的 12.0 厘米減少到僅 6.0 厘米。同時也消除了熔滴現象。與對照 PA6（494.7 kW/ m 2和21.4 MJ /米2). 分析結果表明，不可燃氣體稀釋了可燃氣體。焦炭殘留物的觀察表明形成了穩定的焦炭層，有效地抑制了熱量和氧氣的傳遞。不含有機溶劑的涂層不含任何常規的鹵素/磷元素，這為生產環保型阻燃織物提供了一種有用的方法。