植酸的铵化及其对Lyocell织物的阻燃整理

为提高Lyocell织物的阻燃效果,对天然磷化物植酸进行铵化改性,并以双氰胺为催化剂应用于Lyocell织物的阻燃整理。利用傅里叶红外光谱仪、扫描电子显微镜、热重分析仪,测定了阻燃整理Lyocell织物的特征红外吸收、表面形貌以及热稳定性能。对阻燃织物进行了垂直燃烧实验,测定了织物的燃烧性能,并对整理织物的耐洗性进行了测试。结果表明:与未整理Lyocell织物相比,阻燃整理后织物的吸热降解质量损失率下降了20.11%,800 ℃ 时热解残炭量提高了27.98%,垂直燃烧的损毁长度下降至3.4 cm;极限氧指数高达36.6%,达到难燃的级别;且阻燃织物经20次标准洗涤后,仍能达到国家B2标准。

Ammonium modification of phytic acid and flame retardant finishing of Lyocell fabric

In order to improve the flame retardancy of Lyocell fabrics,the natural phytic acid was ammonium modified,and the dicyandiamide was used as catalyst for flame retardant finishing of Lyocell fabrics.The characteristic groups of phytic acid ammonium were characterized by Fourier transform infrared spectroscopy.By means of Fourier transform infrared spectroscopy,scanning electron microscopy,thermogravimetric analysis,vertical burning instrument and limiting oxygen index,the infrared absorption,surface morphology and thermal stability of the finishing Lyocell fabric were determined.The results show that,compared with the unfinished Lyocell fabric,the mass loss rate of endothermic degradation decreases by 20.11%,the amount of carbon increases by 27.98%at 800℃.The vertical burning damage length of the finished Lyocell fabric decreases to 3.4 cm,the limiting oxygen index is up to 36.6%,reaching an acceptible flame retardant level.After 20 standard washings,the Lyocell fabrics finished with the flame retardant can still reach the requirements set in standard GB B2.