水性超细碳黑在N-甲基吗啉-N-氧化物溶液中的分散稳定性

 采用直接分散法和乳液聚合法分别制备了可用于Lyocell纤维原液着色用的水性分散型超细碳黑和包覆型超细碳黑，研究了不同方法得到超细碳黑的粒子大小以及在N-甲基吗啉-N-氧化物(NMMO)溶液中的分散稳定性。研究结果表明包覆型超细碳黑的平均粒径明显小于分散型超细碳黑，包覆型超细碳黑在NMMO溶液中的离心稳定性和耐热稳定性高于分散型超细碳黑，NMMO溶液中加入包覆型超细碳黑，其粘度明显下降，且加入量越大，粘度下降越明显。

Dispersion stability of water soluble ultrafine carbon black in N-methyl morpholine-N-oxide solution

The water soluble ultrafine carbon black and encapsulated ultrafine carbon black that were suitable for dope dyeing of Lyocell fiber were prepared by direct dispersing method and emulsion polymerization method,respectively,and the particle size of the ultrafine carbon black obtained with different methods and their dispersion stabilities in the N-methyl morpholine-N-oxide(NMMO) solution were investigated.Experimental results revealed that the average particle size of encapsulated ultrafine carbon black was obviously smaller than that of dispersive ultrafine carbon black and its centrifugal stability and thermal stability in NMMO solution were higher than those of dispersive ultrafine carbon black.The apparent viscosity of NMMO solution decreased when encapsulated carbon was added,and the more amount of encapsulated carbon added,the lower viscosity of NMMO solution was.