Low odor environment-friendly type nano pigment inkjet ink composition

Abstract

A low odor environment-friendly type nano pigment inkjet ink composition has excellent storage stability, inkjet stability and printing quality. A spray nozzle orifice is not easy to be blocked, printed images are high in gloss, resistant to scraping and resistant to weather. A low toxicity and low odor material is used. The ink has a high flash point and is safe for human health and environment, and meets the needs of environmental protection and maintaining print quality. The ink composition comprises 1-10% of N-ethyl pyrrolidone, 1-20% of propylene carbonate, 50-80% of ether alcohol solvents, pigments, a dispersant, resin, a plasticizer, a surface active agent and a cyclic tertiary amine compound as an acid adjusting agent.

Description

technical field [0001] The invention relates to an inkjet ink composition, in particular to a low-odor environment-friendly nano-pigment inkjet ink composition, which can be used in a solvent-type piezoelectric inkjet printer. The ink uses a low-odor, low-toxicity solvent , without adding any harmful substances, the ink has good storage stability and inkjet stability, the printed image has high gloss, scratch resistance and weather resistance, and more importantly, the ink is not easy to block the nozzle holes of the nozzle, and can have Requirements for environmental protection and maintaining print quality. Background technique [0002] Digital inkjet is controlled by software, using the nozzle to spray ink onto the printing medium to form text or images. This liquid inkjet method can be divided into thermal head and piezoelectric (Piezo head) according to the mechanism of the nozzle. , under the control of the piezoelectric technology, the piezoelectric element is deform...

AI Technical Summary

Problems solved by technology

The disadvantage is that the solvent volatilizes quickly and has a strong pungent smell. According to US Patent US 5371279, ethylene glycol butyl ether acetate decomposes in an environment with high water content or heavy humidity, and will produce acidic substances; The patent US 2009 / 0139432A1 pointed out that such acidic substances can easily cause corrosion of the nozzle, causing the nozzle to produce oblique spraying and hole breakage, which affects the quality of inkjet, and the acidic substance is suppressed by adding alcohol amine compounds; similarly, the European patent EP 2284226A1 also pointed out the problem of acid corrosion of ink, which changed to use cyclohexylamine and imidazole compounds as acid regulators, but the regulators such as alcohol amines and imidazoles all have high toxicity and corrosion, and are difficult to operate and use. have security concerns

[0005] The third type is environmentally friendly ink, which uses ether alcohol as the main solvent. For example, diethylene glycol diethyl ether is used as the main ink composition solvent and pigment dispersion solvent component. The advantage of using this type of solvent is that it is less toxic and does not contain The pungent smell greatly improves the safety; the disadvantage is that the boiling point of the solvent is slightly low, and the organic volatile gases (VOCs, Volatile organic compounds) are high. Easy to disperse, high threshold for ink production

In addition, adding too much highly polar pyrrolidone solvent will dissolve and destroy the nozzle material

Generally speaking, ketone and ester solvents have good corrosiveness to PVC materials, and the solvent smell is heavy, and the safety of such solvents is relatively reduced.

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