Rationally designed lentinan outer layer to improve the comprehensive performance of flame-retardant cotton fabrics
writer：Feng Chen
keywords：Flame retardancy，Cotton fabric，Phytic acid，Lentinan，Durability
source：期刊
Issue time：2023年
As the most widely used natural fabric, cotton fabric is highly flammable with serious fire hazard concerns. The use of biomass materials to impart flame resistance to fabrics is always a hot topic of interest. In this work, a novel durable flame retardant cotton fabric (Cotton-APA/LNT) was fabricated by successively covalent bonding ammonium phytate (APA) and lentinan (LNT). The Cotton-APA/LNT fabric sample had a highly limiting oxygen index (LOI) value of 51.5 % and was self-extinguished in the vertical burning test (VBT) at 18.0 % weight gain. The peak heat release rate and total heat release values were decreased by 91.5 % and 46.0 %, respectively compared with those of the control cotton. Besides, after 50 laundering cycles (LCs), the fabric was still self-extinguished in the VBT with an LOI value of 34.2 %. APA fully strengthened the role of acid source by the presence of LNT. The constructed LNT outer layer showed comprehensive improvements in thermostability, flame retardancy, smoke suppression, durability, and breaking force. Specifically, the Cotton-APA/LNT sample had a higher LOI value (↑4.3 %), lower total heat release (↓23.8 %), lower total smoke production (↓29.1 %), higher thermostability (↑27 °C
under air), better char formation ability (↑2.0 % under air), higher durability (self-extinguished in the VBT after 50 LCs), and higher breaking force (↑32.5 % in the warp direction and ↑33.9 % in the weft direction) compared with those of Cotton-APA sample. This work has proposed an advanced approach for fabricating eco-friendly durable fire-safety cotton fabrics.
作為應用最廣泛的天然織物，棉布具有高度易燃性，存在嚴重的火災隱患。使用生物質材料賦予織物阻燃性一直是人們感興趣的熱門話題。本工作通過連續共價鍵合植酸酶（APA）和香菇多糖（LNT）制備了一種新型耐用阻燃棉織物（cotton APA/LNT）。棉APA/LNT織物樣品具有51.5%的高極限氧指數（LOI）值，并且在重量增加18.0%的垂直燃燒試驗（VBT）中自熄滅。與對照棉布相比，棉布的峰值放熱率和總放熱值分別降低了91.5%和46.0%。此外，經過50次洗滌循環（LC）后，織物在VBT中仍然是自熄滅的，LOI值為34.2%。APA通過LNT的存在充分強化了酸源的作用。所構建的LNT外層在熱穩定性、阻燃性和熱穩定性方面表現出全面的改善，