超支化磷酰胺在粘胶织物阻燃整理中的应用

为开发无甲醛阻燃粘胶织物,以多羟基超支化磷酰胺(HPAE)和1,2,3,4-丁烷四羧酸(BTCA)为阻燃整理体系,制备阻燃粘胶织物。对比分析整理前后粘胶织物的表面结构组成、成炭性能和燃烧行为,评价该阻燃整理体系对粘胶织物的拉伸断裂强力、折皱回复角和白度的影响。结果表明:当织物的质量增加率为22.5%时,极限氧指数(LOI值)从21.0%提高到28.9%,织物离火自熄,能顺利通过垂直燃烧测试;HPAE极大提升了粘胶织物的成炭能力,在800 ℃氮气氛围中的残炭量为42.9%;整理后织物在燃烧过程中的热释放明显降低,最大热释放速率和总热释放量分别下降了59.4%和15.1%;经过25次标准水洗后,LOI值从29.1%下降到24.8%。

Application of hyperbranched phosphoramide in flame retardant finishing of viscose fabrics

In order to realize synchronously formaldehyde-free and flame retardant properties of viscose fabrics, a flame-retardant viscose fabric was prepared with polyhydroxy hyperbranched phosphoramide (HPAE) and 1,2,3,4-butanetetracarboxylic acid (BTCA) as the flame retardant finishing system in this paper. The surface structure composition, charring performance and burning behavior of the viscose fabric before and after finishing were compared and analyzed, and the effect of the flame retardant system on the tensile breaking strength, wrinkle recovery angle and whiteness of viscose fabric were evaluated. The results show that when the weight gain of the fabric reaches 22.5%, the limiting oxygen index (LOI) value is increased from 21.0% to 28.9%. The fabric can self-extinguish after leaving the fire, and can successfully pass the vertical burning test.The introduction of HPAE greatly improved the carbon-forming ability of the viscose fabric, and the residual char retention rate was 42.9% in the nitrogen atmosphere at 800 ℃.The heat release of the finished fabric in the combustion process was obviously reduced,and the peak heat release rate (pHRR) and the total heat release (THR) decreased by 59.4% and 15.1%, respectively. After 25 standard washings, the LOI value of the fabric dropped from 29.1% to 24.8%.