UV ink jet with regulatable ink droplet end state and preparation method thereof

Abstract

The invention belongs to the field of printing consumables, and discloses a UV ink jet with regulatable ink droplet end state. The UV ink jet is mainly prepared from the following raw materials: a monomer, an acrylate oligomer, a photoinitiator, a dispersing agent and a pigment; wherein the monomer is acrylic ester and / or acrylic acid; the monomer and the acrylate oligomer satisfy the following conditions that: (1) the Mu value of the monomer is less than 4; (2) the Mu value of the acrylate oligomer is less than 4; (3) the sum of the Mu value of the monomer and the Mu value of the acrylate oligomer is 4-8; wherein Mu=arithmetic square root of a viscosity value at 25DEG C*percentage of a substance accounting for the total mass the raw materials. According to the UV ink jet provided by the invention, a high-molecular-weight oligomer and the monomer can have good compatibility; trailing and satellite points do not exist during ink jetting, meanwhile, line breaking, oblique jetting or no ink discharging of a nozzle cannot occur, and the size and the speed of ink droplets are both precise and stable during printing.

Description

technical field [0001] The invention belongs to the field of printing consumables, and in particular relates to a UV inkjet capable of regulating the end state of ink droplets and a preparation method thereof. Background technique [0002] UV inkjet is an environmentally friendly and energy-saving inkjet that does not contain volatile organic solvents and does not need to be dried. It is widely used in billboards, literature, signboards, wallpapers, car stickers, packaging, cartons and other places that require high-precision graphics. In addition, the digital printing capability of UV inkjet can achieve on-demand printing, which is easy to customize and beautify, and the output effect is comparable to photo images, which is beyond the reach of traditional printing. In order to achieve high-precision image output, the size of the ink droplet needs to be precisely controlled, including the ejection speed of the ink droplet, the appearance and size of the ink droplet, and the...

AI Technical Summary

Problems solved by technology

Especially the use of high molecular weight oligomers or resins can quickly increase the viscosity of the ink to achieve a perfect ink drop with almost no tailing and no satellites, and the appearance is similar to a sphere, but this method has a fatal problem

The reason is that high-molecular-weight oligomers generally have poor compatibility with monomer solvents. They flow in the nozzle channel of the capillary and are easily adsorbed on the channel wall, which in turn causes the ink to locally thicken and become viscous.

A common phenomenon is that when using high-molecular-weight oligomer or resin ink, there will be problems such as ink breakage or oblique spray after long-term printing, or ink will not come out after the nozzle is left standing.

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