Technique for preparing micro-nano reduction dyestuff

A preparation technology of a micro-nanometer vat dye is characterized in that a process comprises first, adding vat dyes, dispersing agent and water in a ball grinder, ball-grinding and mixing to form slurry material and pre-dispersing, second, impacting and grinding the fluid energy of the mixture which is got through the upper step through a pin-rod-type grinder, third, adding defoaming agent in the mixture which is grinded, grinding in an ultra-fine state in a bidirectional rotating ball grinder, finally, handling the mixture which is got from the upper step in homogenization through adopting the pin-rod-type grinder or a high-pressure homogenizer. The technical process which is adopted by the new technique is that different equipment and technical processes are chosen to effectively grind to reach a best effect of grinding according to the particle distribution and physical characteristics of pulp-shaped material in different stages, and a technical cycle period is between 12 hours to 48 hours. The traditional technique utilizes unchangeable apparatuses and technique to grind various dyes with different structures and performances, and the new technique utilizes various changeable and adjustable apparatuses and technique to find a best grinding process aiming at various dyes with different structures and performances.