聚氨酯分散剂在液体靛蓝制备中的应用

Application of polyurethane dispersant in preparation of liquid indigo

摘要:

采用异佛尔酮二异氰酸酯（IPDI）、聚乙二醇200、400、600、800（PEG）、二羟甲基丙酸（DMPA）、1-苯基-1,2-乙二醇、中和剂（TEA）、甲乙酮肟等为原料，制备了一种阴离子聚氨酯分散剂。通过FTIR、GPC、TG等表征了分散剂的结构与性能。利用自制的分散剂采用研磨法制备了液体靛蓝分散液，以液体靛蓝分散液粒径、离心稳定性、储存稳定性为指标，探讨了分散剂链长、用量对分散液性能的影响。结果表明，研磨1h后，以聚乙二醇400为软段合成的聚氨酯分散剂用量为染料用量的60%时制备的液体靛蓝粒径为277.1 nm，1000 r/min离心稳定性达到94 %，3000 r/min离心稳定性为51%，常温放置7d后粒径变化在20 nm以内，染色后织物的K/S为10左右，是粉状靛蓝染色K/S的2倍，染色织物的颜色性能并未改变，SEM显示分散体颗粒大小分布均匀，与分散剂甲基萘磺酸钠的甲醛缩合物(MF)和木质素85A相比，其分散体系稳定性差别不大。

Abstract:

A anionic polyurethane dispersions were prepared from isophorone diisocyanate (IPDI), polyethylene glycol 200, 400, 600, 800 (PEG), dimethylpropyl acid (DMPA), 1-phenyl-1,2-glycol, neutralizer (TEA), methylketoxime and so on. The structure and properties of the dispersant were characterized by FTIR、GPC and TG. The liquid indigo dispersion was prepared by grinding method with the self-made dispersant. The influence of the chain length and amount of the dispersant on the performance of the dispersion was discussed. After grinding for 1h, when the amount of polyurethane dispersant synthesized with polyethylene glycol 400 as the soft segment was 60% of the amount of dye, the particle size of liquid indigo prepared was 277.1 nm, the centrifugal stability at 1000 r/min was 94%, and the centrifugal stability at 3000 r/min was 51%. After being placed at room temperature for 7 days, the particle size changed within 20 nm, and the K/S of the dyed fabric was about 10, which was twice that of powdered indigo, The color properties of the dyed fabric did not change. SEM showed that the particle size distribution of the dispersion was uniform. There was little difference in the stability of the dispersion system compared with the formaldehyde condensate (MF) of sodium methylnaphthalene sulfonate and lignin 85A.