Wu Xin, Gou Tingting, Zhao Qianyu, Chen Lei, Wang Peng
College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing 400715, China.
College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing 400715, China; Chongqing Engineering Research Center of Biomaterial Fiber and Modern Textile, Chongqing 400715, China.
Int J Biol Macromol. 2022 Jan 1;194:945-953. doi: 10.1016/j.ijbiomac.2021.11.149. Epub 2021 Nov 25.
Cotton fibers mainly consist of cellulose biological macromolecule, and its exceedingly flammable nature has severely restricted its application in the fields requiring flame retardancy. To endow cotton fabric with excellent flame retardancy and superior durability, a high-efficiency durable flame retardant (THPO-P) with ammonium phosphate ester and phosphine oxide groups was synthesized and chemically bonded to cotton fabric through padding-baking method. THPO-P showed high flame-retardant efficiency, and the add-on of 5.9% was sufficient to prepare cotton fabric with self-extinguished feature. With the add-on of 19.9%, treated fabric possessed excellent fire safety and durability. The total heat release and peak heat release rate values reduced by 77.1% and 91.8% in contrast to pristine fabric, respectively. Its LOI value still reached up to 33.4% even after 50 laundering cycles, which was far beyond the flame-retardant standard. THPO-P played flame-retardant role by restraining the release of flammable volatiles, liberating nonflammable gases and promoting the char formation during combustion. The flame-retardant treatment deteriorated the tensile strength, whiteness and softness of cotton fabric.
棉纤维主要由纤维素生物大分子组成，其极易燃烧的特性严重限制了它在需要阻燃的领域中的应用。为了赋予棉织物优异的阻燃性和卓越的耐久性，合成了一种含有磷酸酯和氧化膦基团的高效耐久阻燃剂（THPO-P），并通过浸轧焙烘法将其化学键合到棉织物上。THPO-P表现出高阻燃效率，5.9%的添加量足以制备出具有自熄特性的棉织物。添加量为19.9%时，处理后的织物具有优异的消防安全性能和耐久性。与原始织物相比，总热释放量和热释放峰值速率分别降低了77.1%和91.8%。即使经过50次洗涤循环，其极限氧指数值仍高达33.4%，远远超过阻燃标准。THPO-P通过抑制可燃挥发物的释放、释放不可燃气体以及促进燃烧过程中的炭形成来发挥阻燃作用。阻燃处理使棉织物的拉伸强度、白度和柔软度有所下降。
