Method for preparing colorant used in producing color acrylic fibre by mass coloration method

The present invention relates to a preparation method of coloring material for producing colored acrylic fiber by adopting mass coloration process. Said method includes the following steps: mixing pigment, dispersing agent and NaSCN aqueous solution and grinding in ball-grinding machine, in the coloring material the pigment content is 5-25 wt%, the weight ratio of pigment and dispersing agent is 100:3-30, and the ginding time is 0.5-5.0, then the coloring material product can be obtained. The above-mentioned dispersing agent is one compound selected from naphthalenesulfonate formaldehyde condensate, methyl naphthalene sulfonate formaldehyde condensate or benzyl naphthalene sulfonate formaldehyde condensate or mixture of them, and the pigment is carbon black, phthalocyanine blue, iron oxide or ultrasmarine. 一种用于原液着色法生产有色腈纶的着色剂的制备方法，该方法包括将颜料、分散剂和NaSCN水溶液混合后于球磨机中进行研磨，在着色剂中，颜料的含量为5～25wt％，颜料与分散剂的重量比为100∶3～30，研磨0.5～5.0小时后得到着色剂产品，上述分散剂取自萘磺酸盐甲醛缩合物、甲基萘磺酸盐甲醛缩合物或苄基萘磺酸盐甲醛缩合物中的一种化合物或两种以上化合物的混合物，而颜料一般为炭黑、酞菁蓝、氧化铁或群青。制备所得的着色剂在放置至少30天以后没有明显的分层现象和凝聚现象，显示出炭黑分散体系具有良好的分散稳定性，一般着色剂中颜料颗粒的重量中位粒径可维持在0.4～0.7μm。