The invention provides a method for preparing an alkali-resistant liquid
disperse dye by an anti-
solvent crystallization method, which comprises the following steps: dissolving an alkali-resistant
disperse dye solid in a low-boiling-point
solvent, ultrasonically heating to destroy the
crystal structure of the dye, and filtering to obtain a dye solution; dissolving a
crystal control agent and a dispersing agent in a high-boiling-point
solvent to obtain an anti-solvent; slowly adding the dye solution into the anti-solvent, stirring, cooling, and removing the low-boiling-point solvent after dye crystals are stable; the anti-solvent method is applied to preparation of the alkali-resistant liquid
disperse dye for the first time, and compared with a traditional
grinding method, the method has the advantages of low
energy consumption, simple equipment and less
pollution; the prepared alkali-resistant liquid disperse dye has the advantages that the particle size can be as low as 130nm, the storage stability is good, the deep
dyeing property is improved compared with that of the conventional alkali-resistant liquid disperse dye, the dye
utilization rate is high, the
dyeing soaping fastness is higher than level 4, the
dyeing COD value is reduced compared with that of the conventional dye with the same strength, the use is convenient, and the dyeing process is simplified.