Preparation method of pigment used for water-based ink

Abstract

The invention discloses a preparation method of a pigment used for water-based ink, which comprises the following steps: stirring 50-200 parts of water and 22 parts of sodium hydroxide, adding 22-24 parts of tobias acid and 0.1-2 parts of 2, 6 acid, dissolving, filtering, adding 28.4 parts of hydrochloric acid at the temperature of -3 to 2 DEG C, stirring, adding 30.4 parts of sodium nitrite solution, stirring at the temperature of 0-5 DEG C, adding 56 parts of calcium chloride solution, and stirring to obtain a solution I; stirring 200-720 parts of water and 24.5 parts of sodium hydroxide, adding 16 parts of 2-naphthol to dissolve at the temperature of 20-60 DEG C and filter, and adding 0.1-5.6 parts of rosin solution and 0.1-4 parts of turkey red oil solution into a filtrate at the temperature of 20-60 DEG C to obtain a solution II; adding the solution II into the solution I at the temperature of 0-5 DEG C to couple for 20 minutes, stirring for 30-60 minutes at the temperature of 10-15 DEG C, raising the temperature to 65-90 DEG C to transform completely, stirring for 10-30 minutes, filtering by pressing, washing filter cakes by water, and removing moisture in the filter cakes to obtain the pigment used for water-based ink. The viscosity stability of ink prepared from the pigment used for water-based ink disclosed by the invention is high, and after the treatment of 48 hours at the temperature of 50 DEG C, the viscosity is still basically unchanged.

Description

technical field [0001] The invention relates to a preparation method of a pigment for water-based ink. Background technique [0002] In today's society, the speed of printing machines is getting faster and faster, requiring high-strength and low-viscosity inks; while ordinary azo lake pigments have poor viscosity stability, resulting in unstable print quality. Contents of the invention [0003] The purpose of the present invention is to provide a kind of preparation method of the prepared pigment for water-based ink with high ink viscosity stability. [0004] The preparation method of water-based ink pigment provided by the present invention may further comprise the steps: [0005] 50 to 200 parts by weight of water and 22 parts by weight of caustic soda, stirred, added 22 to 24 parts by weight of Turmeric's acid and 0.1 to 2 parts by weight of 2,6 acid to dissolve, filtered, cooled the filtrate to -3 to 0°C, added 28.4 parts by weight 1 part hydrochloric acid, stir, add...

AI Technical Summary

Problems solved by technology

[0002] In today's society, the speed of printing machines is getting faster and faster, requiring high-strength and low-viscosity inks; while ordinary azo lake pigments have poor viscosity stability, resulting in unstable print quality