Digital painting printing ink containing pigment and dye, preparation thereof

Abstract

A numerical-code spraying ink containing pigment and dyestuff is prepared by adding in the pigment and dyestuff, because the price of solvent dyestuff is cheaper than the organic dyestuff. So it will decrease the cost. Colors of the ink include bluish, fuchsin, yellow and black. The process is so simple enough to industrial production.

Description

technical field [0001] The invention relates to a solvent-based ink, in particular to an ink suitable for large digital inkjet printers. Background technique [0002] In recent years, large-scale inkjet printers have developed rapidly with the development of the computer industry. According to the working principle of the nozzle, inkjet printers can be divided into thermal foam type and piezoelectric crystal type. Thermal foam nozzles are mainly used in inkjet machines of companies such as Hewlett Packard Corporation and Mimaki. These nozzles mainly use water-based inks, and the colorants are usually dyes; piezoelectric crystal nozzles are mainly used in Vutek. ), Yaselan and other companies’ inkjet printers, this type of nozzle mainly uses solvent-based inks, and the colorant is organic pigments. Nozzles with different working principles have different performance requirements for inks. For example, the viscosity of ink used in thermal foam nozzles is 3-5 centipoise (25°C)...

AI Technical Summary

Problems solved by technology

[0003] The colorant (dye) in the water-based ink is dissolved in the ink composition, but the water-based ink containing soluble dyes has problems such as poor water fastness and light fastness

There is still a big disadvantage of water-based ink for industrial applications, that is, the drying problem, because the low evaporation rate of water causes the drying process of water-based ink to take a long time, even if a heater is used, it still takes a long time to dry time

At the same time, the substrates that can be used for water-based inks also have certain limitations: they must be those that can absorb water, and cannot be used for substrates that cannot absorb water;

However, because the pigment cannot be dissolved in the ink composition, but exists in the ink as small particles, a new problem is bound to arise: how to ensure the stability of the ink and ensure the performance of the ink for which the colorant is an organic pigment. Uniformity to prevent clogging of nozzles due to aggregation of pigment particles

But because the production process of pigment predispersion is complicated, the price is very high

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