相变Lyocell纤维制备中微胶囊相变材料与溶剂的相互作用

Preparation of phase change Lyocell fiber and influence of microcapsule on solvent recovery

为制备功能性相变Lyocell纤维,研究功能化过程中添加剂的加入对Lyocell溶剂回收可能造成的影响。测试了微胶囊在N-甲基吗啉-N-氧化物(NMMO)中的分散性及其热稳定性,分析少量氮甲基吗啉(NMM)和吗啉(M)加入到NMMO中时紫外光谱及红外光谱的变化;借助紫外光谱、红外光谱研究了微胶囊与NMMO之间的相互作用。结果表明微胶囊的加入没有使NMMO过多地分解为NMM和M,且对凝固浴的检测也表明凝固浴中的微胶囊含量低于仪器的检测极限,证明微胶囊的加入不会影响到Lyocell纤维制备中的溶剂回收。根据差示扫描量热法的测试结果计算出Lyocell纤维中微胶囊的破损率,纺制的相变Lyocell纤维有良好的相变性能,力学性能满足服用要求。

In order to prepare the functional fibers of Lyocell, the possible effects of additives on Lyocell solvent recovery in the process of functionalization was investigated. The dispersion and thermal stability of microcapsules in N／｜methylmorphdine／｜N／｜oxide（NMMO） were tested. A small amount of N／｜methylmorph dine（NMM） and morphdine（M） were added to NMMO, and the changes of ultraviolet and infrared spectra during this process to determine whether the addition of microcapsules caused more decomposition of NMMO were studied. The minimum detectable concentration of microcapsule dispersion was tested with ultraviolet spectrum, and it was found that even dilution to 2 ppm we could detect the presence of microcapsules in the ultraviolet spectrum. Infrared radiation spectra, ultraviolet spectra of microcapsule was studied on the effect on the stability of the NMMO, and results show that the microcapsule would not make NMMO decompose into NMM and M too much, and about the detection of coagulation bath also suggests that microcapsules in the coagulation bath content below the instrument detection limit, so microcapsules will not affect the Lyocell solvent recovery. The damage rate of microcapsules in Lyocell fiber was calculated according to differential scanning calorimetry. The phase change Lyocell fiber has good phase transition performance, and the mechanical properties meet the requirements.