水性超细炭黑在N-甲基吗啉-N-氧化物溶液中的分散稳定性

摘要

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.%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炭黑和包覆型超细炭黑,研究了不同方法制成的超细炭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.结果表明:包覆型超细炭黑的平均粒径明显小于分散型超细炭黑,且在NMMO溶液中的离心稳定性和耐热稳定性高于分散型超细炭黑；NMMO溶液中加入包覆型超细炭黑,其黏度明显下降,且加入量越大,黏度下降越明显.