Preparation method for easily-dispersed phthalocyanine blue 15: 4

Abstract

The invention discloses a preparation method for easily-dispersed phthalocyanine blue 15: 4, comprising the following steps of: (1) adding a phthalocyanine blue 15: 3 filter cake and copper phthalocyanine derivatives into water, uniformly slurrying, adding additives and performing a surface treatment, heating to 50-90 DEG C, and preserving heat for 1-5h; (2) filtering the materials subjected to the surface treatment in the step (1) via a press filter, washing the materials with water until the conductivity of effluent reaches specified requirements, unloading the filter cake, uniformly spreading the filter cake into a vacuum freeze drier and performing freeze drying treatment, and then obtaining the easily-dispersed phthalocyanine blue 15: 4. According to the invention, the surface performance, the crystallization resistance and the flocculation resistance of pigment particles can be effectively improved by addition of the copper phthalocyanine derivatives and the additives for the surface treatment; simultaneously, the serious aggregation phenomenon of the particles during the traditional drying process can be reduced to the minimum by implementation of a drying treatment of the pigment by means of vacuum freeze drying, and thus the dispersing performance of the pigment is effectively improved and can be better applied to ink for ink-jet.

Description

technical field [0001] The invention relates to a preparation method of easily dispersible phthalocyanine blue 15:4, which belongs to the technical field of chemical synthesis. Background technique [0002] Phthalocyanine blue pigment is a blue organic pigment with stable performance, which is widely used in ink, paint, plastic and many other fields. The main crystal forms are α, β, ε, etc. Among them, phthalocyanine blue 15:4 is the most stable blue pigment among phthalocyanine blue pigments. It has good stability to heat and organic solvents, and presents a bright green light blue. [0003] The traditional preparation method is mainly obtained from crude copper phthalocyanine through vertical ball milling or horizontal milling and solvent treatment. Both of the above two methods have poor dispersion performance of pigments. The main problem is that the final drying method uses traditional oven, Drying room or flash drying will lead to serious aggregation of pigment partic...

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Problems solved by technology

[0003] The traditional preparation method is mainly obtained from crude copper phthalocyanine through vertical ball milling or horizontal milling and solvent treatment. Both of the above two methods have poor dispersion performance of pigments. The main problem is that the final drying method uses traditional oven, Drying room or flash drying will lead to serious aggregation of pigment particles, which will directly affect the final product. It is difficult to disperse during the application process, especially when used in high-end fields, such as inkjet ink, pigment particles are difficult to disperse, and even if it can be Dispersion, but the anti-crystallization and anti-flocculation properties of the pigment are not ideal, which affects the storage stability of the inkjet ink, that is, the ink cannot be placed for a long time, otherwise it will cause a series of problems such as unusable due to factors such as agglomeration or swelling.

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