Hexamethylolmelamine was used as a cross-linking agent to graft 3-(dimethylphosphono)-N-methylolpropionamide (MDPA) onto Lyocell fibers in a posttreatment process to reduce flammability. The effects of processing conditions on the mechanical properties and P content of the fibers were examined. The results show that increasing the MDPA concentration, microwave treatment time, baking temperature, and baking time increases the P concentration in the fibers, although the mechanical properties of the fibers are reduced to varying degrees. The optimal processing conditions comprise a 40% MDPA concentration, a 320 W microwave treatment for 3 minutes, and baking at 160°C for 5 minutes. Under these conditions, flame-retardant Lyocell fibers with a breaking strength of 2.47 cN·dtex⁻¹ and a limiting oxygen index of 34.6% were obtained, which meet the performance requirements for textile fibers. Thermogravimetric data indicate that the residual fiber mass after heating increased from 4.7% before treatment to 21.5% after treatment. There was only a minimal change in the hygroscopicity of the treated Lyocell fibers. In addition, after 30 washes, the limiting oxygen index was decreased to 26.5% while maintaining a good flame-retardant effect.

中文翻译：

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Lyocell纤维的阻燃处理及对各种纤维性能的影响

六羟甲基三聚氰胺用作交联剂，在后处理过程中将 3-(二甲基膦酰基) -N-羟甲基丙酰胺(MDPA) 接枝到莱赛尔纤维上，以降低可燃性。考察了加工条件对纤维力学性能和P含量的影响。结果表明，增加 MDPA 浓度、微波处理时间、烘烤温度和烘烤时间会增加纤维中的 P 浓度，但纤维的力学性能都有不同程度的降低。最佳处理条件包括 40% MDPA 浓度、320 W 微波处理 3 分钟和 160°C 烘烤 5 分钟。在这些条件下，阻燃莱赛尔纤维的断裂强度为 2.47 cN·dtex ^-1得到的极限氧指数为34.6%，满足纺织纤维的性能要求。热重数据表明，加热后的残余纤维质量从处理前的 4.7% 增加到处理后的 21.5%。处理过的莱赛尔纤维的吸湿性只有很小的变化。此外，经过30次洗涤后，极限氧指数降至26.5%，同时保持良好的阻燃效果。