Double-lamp-curing white UV inkjet ink and preparation method thereof

Abstract

The invention discloses double-lamp-curing white UV inkjet ink. The double-lamp-curing white UV inkjet ink is prepared from the following raw materials, in percentages by mass: 5-15% of a nanoscale pigment, 3-10% of a polyester acrylate oligomer, 2-5% of a polyurethane acrylate oligomer, 5-20% of a photoinitiator, 15-45% of a single-functional or two-functional reactive monomer containing -(CH2)n-structure in the molecular chain, wherein n>=5, 5-30% of an ethoxylated or propoxylated active monomer with three or more of functional groups, 20-60% of other active monomers, and 5-15% of an auxiliary agent. The UV inkjet ink provided by the invention does not contain organic solvents and has the characteristics of greenness and environmental protection; the ink can be cured instantaneously under irradiation of a mercury lamp and an LED lamp, the surface is not sticky, and requirements of double-lamp printing are satisfied; and the ink has good continuity and fluency, good storage stability, good flexibility, no cracking, no brittleness, moderate hardness, high film strength, good adhesion to a substrate and wide adaptability.

Description

technical field [0001] The invention belongs to the technical field of inkjet printing and printing, and in particular relates to a double-lamp curing white UV inkjet ink and a preparation method thereof. Background technique [0002] In inkjet printing and printing, tiny ink fluid droplets are directly ejected onto the surface of the ink-receiving body, and there is no physical contact between the printing and printing equipment and the ink-receiving body. This printing and printing equipment stores the printing data electronically. And a device is controlled to image-wise eject drops of inkjet ink onto an ink-receiver. Inkjet ink is an indispensable part of inkjet printing and printing, which is divided into water-based according to the drying mechanism, whose drying mechanism involves absorption, penetration and evaporation; oil-based, whose drying involves absorption and penetration; solvent-based, whose drying Mechanisms mainly involve evaporation; thermal melting or p...

AI Technical Summary

Problems solved by technology

[0007] The white pigment of white ink has high reflectivity, the light absorption efficiency is relatively low, which affects the curing rate, and the requirements for the initiation system are relatively high. Due to the well-known existence of oxygen inhibition, for UVLED light sources, it will be more effective than mercury lamp light sources. Severe oxygen inhibition performance, so the white ink LED curing ink is prone to apparent stickiness

[0008] The white pigment of white ink is an inorganic pigment with a relatively large specific gravity, and in order to achieve a better covering effect, the particle size cannot be made too low, but if the particle size is too large, the pigment is easy to settle, and it is difficult to disperse into a stable system. The reason is that the particle size of the pigment is large, the formed film layer is hard and brittle, and it is easy to crack when making relief patterns. At the same time, the adhesion to the substrate is not good, and it is easy to print on the surface and back in the application of white ink. Peel off from the bottom layer or crack easily, requiring white ink to have certain flexibility and adhesion properties

Images